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Smart PV Power Plant Solution
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Change History
Date Version Description Author
2015-06-30 01 Initial draft. Li Junyong (employee ID: 00311268)
Shu Zhenhuan (employee ID: 00192146)
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Contents
Change History ........................................................................................................................... ii
1 About This Document ............................................................................................................. 1
2 Solution Overview ................................................................................................................... 2
2.1 Solution Architecture ............................................................................................................................................. 2
2.2 Solution Scenarios ................................................................................................................................................. 2
2.3 Solution Features ................................................................................................................................................... 3
3 Solution Devices ...................................................................................................................... 5
3.1 Devices Overview ................................................................................................................................................. 5
3.2 Device Description ...............................................................................................................................................10
3.2.1 PV Module ........................................................................................................................................................10
3.2.2 Inverter.............................................................................................................................................................. 11
3.2.3 AC Combiner Box/AC PDC...............................................................................................................................18
3.2.4 Transformer .......................................................................................................................................................21
3.2.5 Power Cable ......................................................................................................................................................22
3.2.6 Smart Communications Cabinet .........................................................................................................................25
3.2.7 Data Collector ...................................................................................................................................................29
3.2.8 PID Module .......................................................................................................................................................31
3.2.9 Ring Network Switch.........................................................................................................................................32
3.2.10 Other Monitoring and Communication Devices ................................................................................................33
4 Solution Scenarios ................................................................................................................. 34
4.1 Overview .............................................................................................................................................................34
4.2 Low-Voltage Grid-tied Scenario ............................................................................................................................34
4.3 Medium-Voltage Grid-tied Scenario ......................................................................................................................35
4.4 Smart PV Power Plant Monitoring Networking Solutions ......................................................................................37
4.4.1 RS485+Fiber Ring Network Solution .................................................................................................................37
4.4.2 RS485+4G LTE Dedicated Network Solution .....................................................................................................39
4.4.3 PLC+4G LTE Dedicated Network Solution ........................................................................................................41
4.4.4 PLC+Fiber Ring Network Solution ....................................................................................................................43
4.4.5 RS485+3G Solution ...........................................................................................................................................45
4.4.6 PLC+3G Solution ..............................................................................................................................................47
4.5 4G LTE Dedicated Network Solution ....................................................................................................................49
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4.5.1 Frequency Band .................................................................................................................................................49
4.5.2 Frequency Band Application ..............................................................................................................................49
4.5.3 Performance ......................................................................................................................................................50
4.5.4 Distributed Architecture and Coverage Distance .................................................................................................50
4.5.5 Site Types ..........................................................................................................................................................51
4.5.6 4G LTE Dedicated Network Base Station Devices ..............................................................................................52
5 FusionSolar Smart PV Management System ...................................................................... 58
5.1 FusionSolar Smart PV Management System..........................................................................................................58
5.1.1 Introduction .......................................................................................................................................................58
5.1.2 FusionSolar Devices ..........................................................................................................................................60
5.2 NetEco 1000S Smart PV Power Plant Management System...................................................................................60
5.2.1 Introduction .......................................................................................................................................................60
5.2.2 MOQ for NetEco 1000S Devices .......................................................................................................................61
6 Reference ................................................................................................................................. 62
Smart PV Power Plant Solution
Descritpion 1 About This Document
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1 About This Document
Purpose
This document describes the following aspects of the smart photovoltaic (PV) power plant
solution:
System composition
Networking in various scenarios
Third-party device access
Device list
Major services
The smart PV power plant solution applies to low-voltage and medium-voltage grid-tied
scenarios. Various solution portfolios are available in these scenarios to meet customers'
requirements.
Intended Audience
This document is intended for:
Installation and commissioning engineers
Site maintenance engineers
Product delivery engineers
System maintenance engineers
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2 Solution Overview
2.1 Solution Architecture
Figure 2-1 Smart PV power plant solution architecture
Multi-plant
centralized
mgmt system
Plant-level
mgmt system
Secondary
equipment
Primary
equipment
Smart O&M cloud center
FusionSolar app Server
Production
mgmt systemArea III Area I
PV terminal and
O&M app
Data collector
EMI
PV panel
EMI
Smart PV
controller Array area
Box-type
transformer
Comm.
mgmt unit
Relay protection device Meter
Switch cabinet
Pooling station
Meter DCD
Step-up
transformerBooster station
Relay protection
device
Data collection and comm
Data stream
Electrical power cable
Load
Area II
Climate
server
Optical power
forecast hostInterworking
devices
Booster
station
monitoring
Remote mgmt unit
Electrical private line
Centralized dispatching systemSmart O&M mgmt system
Mgmt system interface
eLTE Mod bus IEC104
Switch cabinet SVG
Area I Area III
AGC/AVC
Comm.
mgmt unit
Centralized
oscillograph
Internet/dedicated line
Transformer control
Grid
PV monitoring system
The smart PV power plant solution mainly consists of the power system (primary and
secondary equipment) and the monitoring and management system (plant-level management
system and multi-plant centralized management system).
2.2 Solution Scenarios The smart PV power plant solution applies to low-voltage (three-phase, line voltage 380/400
V AC) and medium-voltage (three-phase, line voltage: 6–35 kV AC) grid-tied scenarios.
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Table 2-1 Smart PV power plant solution scenarios
No. Scenario Grid Voltage
Inverter Array Communication Solution
Plant Communication Solution
1 Low-voltage
grid-tied
380/400
V AC
SUN2000-8
/10/12/15/1
7/20/23/33K
TL
RS485 Fiber ring network
3G or 4G router
4G LTE dedicated
network
SUN2000-3
3KTL
PLC Fiber ring network
3G or 4G router
4G LTE dedicated
network
2 Medium-vol
tage
grid-tied
6–35 kV
AC
SUN2000-2
4.5/28/33/40
KTL
RS485 Fiber ring network
3G or 4G router
4G LTE dedicated
network
SUN2000-3
3/40KTL
PLC Fiber ring network
3G or 4G router
4G LTE dedicated network
The low-voltage grid-tied scenario is targeted mainly for direct connection to the
380/400 V AC grid. In this scenario, use the SUN2000-8/10/12/15/17/20/23/33KTL as
the inverter. The SUN2000-8/10/12/15/17/20/23KTL inverter provides the RS485
communication function but not the PLC communication function. The
SUN2000-33KTL inverter provides the RS485 communication function (mandatory) and PLC communication function (optional).
The medium-voltage grid-tied scenario is targeted mainly for connection to the 6–35 kV
AC (after conversion by a step-up transformer) grid. It is recommended that the
SUN2000-28/40KTL be used as the inverter. The SUN2000-28/40KTL provides a 480 V
AC output voltage and the RS485 communication function. The PLC communication function is optional for the SUN2000-40KTL.
In low-voltage grid-tied scenarios such as in Japan or other areas, if the voltage is 200 V,
the SUN2000-24.5/28KTL inverter output voltage (480 V AC) needs to be converted to 200 V AC by a transformer before grid connection.
A power plant can use the fiber ring network, 3G router, or 4G LTE dedicated network solution for communication.
2.3 Solution Features The smart PV power plant solution is smart, efficient, safe, and reliable.
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The smart PV inverter is protected to IP65 and uses the design involving no fuses. It can
also collect high-precision information about each PV string, such as the current and voltage, to precisely locate component faults and other electrical faults.
The solution does not require a large number of DC combiner boxes. Only a small
number of AC combiner boxes that use components not easily damaged, such as fuses,
need to be configured. The AC combiner boxes do not require regular replacement, facilitating maintenance.
The solution uses 4G mobile communication technologies, enabling wireless
transmission of data inside PV arrays. No cable or communication device maintenance is involved.
The smart network management system (NMS) performs monitoring, operation and
maintenance (O&M), management, and alarm functions from various aspects, analyzes
power plant operating problems, and provides comprehensive data and services to O&M personnel, achieving smart O&M.
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3 Solution Devices
3.1 Devices Overview The smart PV power plant solution consists of the power system and the monitoring and
management system. Table 3-1 lists the main devices involved in the solution. For the
monitoring and management system, Table 3-1 lists only the devices required for the power
plant arrays. For details about the devices in the plant-level monitoring system and
FusionSolar smart PV management system, see chapter 5 "FusionSolar Smart PV
Management System."
Table 3-1 Main devices in the smart PV power plant solution
No. Scenario Grid Voltage
Power System Monitoring and Management System
Inverter Other Devices
Array Communication Solution
Plant Communication Solution
Devices
1 Low-volt
age grid-tied
380/400
V AC
SUN200
0-8/10/12
/15/17/20
/23/33KT
L
PV
module,
AC
combiner
box (power
distribution
cabinet,
that is,
PDC),
power cable
RS485 Fiber ring network Smart
communica
tion cabinet
(optional),
data
collector,
ring
network
switch,
optical
fiber,
outdoor
shielded
network
cable
3G or 4G router Smart
communica
tion cabinet
(optional),
data
collector,
3G router,
3G router power
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No. Scenario Grid Voltage
Power System Monitoring and Management System
Inverter Other Devices
Array Communication Solution
Plant Communication Solution
Devices
source,
outdoor
shielded
network
cable, 3G
data card
4G LTE dedicated
network
Smart
communica
tion cabinet
(optional),
data
collector,
power over
Ethernet
(PoE)
power
source,
customer
premises
equipment
(CPE)
terminal,
4G LTE
dedicated
base station devices
SUN200
0-33KTL
PV
module,
AC
combiner
box (PDC),
power cable
PLC Fiber ring network Smart
communica
tion cabinet
(optional),
data
collector,
ring
network
switch,
optical
fiber,
outdoor
shielded
network
cable, PLC
CCO module
3G or 4G router Smart
communica
tion cabinet
(optional),
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No. Scenario Grid Voltage
Power System Monitoring and Management System
Inverter Other Devices
Array Communication Solution
Plant Communication Solution
Devices
data
collector,
3G router,
3G router
power
source,
outdoor
shielded
network
cable, 3G
data card,
PLC CCO module
4G LTE dedicated
network
Smart
communica
tion cabinet
(optional),
data
collector,
PoE power
source,
CPE
terminal,
PLC CCO
module, 4G
LTE
dedicated
base station devices
2 Medium-
voltage
grid-tied
6–35 kV
AC
SUN200
0-24.5/28
/40KTL
PV
module,
AC
combiner
box (PDC),
power
cable, PID
module
(optional),
transformer
RS485 Fiber ring network Smart
communica
tion cabinet
(optional),
data
collector,
ring
network
switch,
optical
fiber,
outdoor
shielded
network cable
3G or 4G router Smart
communica
tion cabinet
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No. Scenario Grid Voltage
Power System Monitoring and Management System
Inverter Other Devices
Array Communication Solution
Plant Communication Solution
Devices
(optional),
data
collector,
3G router,
3G router
power
source,
outdoor
shielded
network
cable, 3G
data card
4G LTE dedicated
network
Smart
communica
tion cabinet
(optional),
data
collector,
PoE power
source,
CPE
terminal,
4G LTE
dedicated
base station devices
SUN200
0-40KTL
PLC Fiber ring network Smart
communica
tion cabinet
(optional),
data
collector,
ring
network
switch,
optical
fiber,
outdoor
shielded
network
cable, PLC
CCO module
3G or 4G router Smart
communica
tion cabinet
(optional),
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No. Scenario Grid Voltage
Power System Monitoring and Management System
Inverter Other Devices
Array Communication Solution
Plant Communication Solution
Devices
data
collector,
3G router,
3G router
power
source,
outdoor
shielded
network
cable, 3G
data card,
PLC CCO module
4G LTE dedicated
network
Smart
communica
tion cabinet
(optional),
data
collector,
PoE power
source,
CPE
terminal,
PLC CCO
module, 4G
LTE
dedicated
base station devices
Remarks:
Inverters for Japan: SUN2000-24.5/28KTL; inverters for Europe and other regions:
SUN2000-8–23, 28, 33KTL
Table 3-1 does not cover devices in the plant-level monitoring system and FusionSolar smart
PV management system. For details about these devices, see chapter 5 "FusionSolar Smart PV
Management System."
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3.2 Device Description
3.2.1 PV Module
Mainstream PV power plants use monocrystalline silicon or polycrystalline silicon solar cells.
Table 3-2 describes the specifications of monocrystalline silicon and polycrystalline silicon
PV modules.
Table 3-2 Specifications of mainstream crystalline silicon PV modules
Specifications/Type
Polycrystalline Silicon Solar Cell-60-260Wp
Polycrystalline Silicon Solar Cell-72-305Wp
Monocrystalline Silicon Solar Cell-60-265Wp
Monocrystalline Silicon Solar Cell-72-310Wp
Number of
wafers
60 72 60 72
Peak power 260 Wp 305 Wp 260 Wp 310 Wp
Open-circuit
voltage
37.7 V 45.4 V 38.3 V 45.57 V
Short-circuit
current
9.09 A 8.93 A 9.37 A 8.85 A
Peak voltage 30.3 V 36.1 V 30.1 V 37.04 V
Peak current 8.59 A 8.45 A 8.79 A 8.37 A
Weight 18.5 kg 25.5 kg 18.5 kg 30 kg
Dimensions 1650 mm x 992
mm x 50 mm
1935 mm x 991 mm
x 45 mm
1650 mm x 992 mm
x 40 mm
1935 mm x 991 mm x
45 mm
Similar specifications
Max. endured
voltage
1000 V DC
Power error + 3%
Wind and
pressure resistant
performance
60 m/s (200 kg/sq.m)
Temperature
coefficient of the
short-circuit current
0.06/ºC
Temperature
coefficient of the
open-circuit voltage
–0.33/ºC
Peak power
temperature coefficient
–0.42/ºC
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Specifications/Type
Polycrystalline Silicon Solar Cell-60-260Wp
Polycrystalline Silicon Solar Cell-72-305Wp
Monocrystalline Silicon Solar Cell-60-265Wp
Monocrystalline Silicon Solar Cell-72-310Wp
Standard test
conditions
Solar irradiance: 1000 W/m2
Panel surface temperature: 25ºC
3.2.2 Inverter
The Huawei SUN2000 string smart inverter functions as the controller in a smart PV power
plant. It efficiently converts DC power into AC power, monitors the power plant, and controls
the active/reactive power output of the power plant.
The working principles of the SUN2000 are described as follows:
The input current detection circuit detects the current of each string, analyzes the
operating status of each string, and generates an alarm to inform users in the case of a string exception so that they can perform maintenance.
The DC switch disconnects internal circuits from the DC input to facilitate manual
operations.
The class II DC surge protective device (SPD) protects the SUN2000 internal circuits from DC overvoltage.
The input/output environmental monitoring instrument (EMI) filter filters out
high-frequency interference in the output current, ensuring that the output current meets the power grid requirements.
The maximum power point tracking (MPPT) circuits ensure optimal output power by
monitoring the voltages and currents of PV strings and tracking the MPP.
The DC-to-AC converter converts the DC power into AC power, which is then fed to the power grid with an output frequency and voltage matching the power grid.
The LC filter filters out electromagnetic interference inside the SUN2000 to ensure that the SUN2000 meets electromagnetic compatibility requirements.
The output isolation relay isolates the inverter from the power grid if either of them is
faulty.
The class II AC SPD protects the SUN2000 internal circuits from AC overvoltage.
Figure 3-1 shows the SUN2000-33/40KTL inverter.
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Figure 3-1 SUN2000-33/40KTL inverter
Table 3-3 describes the electrical specifications of the SUN2000-33/40KTL.
Table 3-3 Electrical specifications of the SUN2000-33/40KTL
Specifications SUN2000-33KTL SUN2000-40KTL
Efficiency
Max. efficiency 98.60% 98.80%
European efficiency 98.30% 98.40%
Input
Max. input power (cosφ = 1) 33,800 W 40,800 W
Max. input voltage 1000 V
Max. input current (per MPPT) 23 A
Max. short-circuit current (per MPPT) 32 A
Max. input current (three MPPTs) 69 A
Min. operating voltage 200 V
Full load MPPT voltage range 480–800 V 580–800 V
Max. inputs 6 6
Number of MPPTs 3 3
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Output
Rated power 30,000 W 36,000 W
Rated output voltage 220–230 V/380–400 V,
3W+N+PE
277/480 V, 3W+PE
Output voltage frequency 50/60 Hz
Max. output current 48 A
Power factor 0.8 overexcited ... 0.8 underexcited
Total harmonic distortion (THD) < 3%
Protection
Input DC switch Supported
Anti-islanding protection Supported
Output overcurrent protection Supported
Input reverse connection protection Supported
Fault detection for PV strings Supported
DC surge protection Class II
AC surge protection Class II
Insulation resistance detection Supported
Residual current device (RCD) detection Supported
Display and Communication
Display LED
RS485 Supported
USB Supported
PLC Supported
Common Parameters
Dimensions (W x H x D) 550 mm x 770 mm x 255 mm
Weight 49 kg
Operating temperature –25ºC to +60ºC
Cooling mode Natural convection
Altitude 4000 m
Relative humidity (non-condensing) 0–100%
Input terminal Amphenol H4
Output terminal Waterproof PG connector + OT terminal
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Protection level IP65
Power consumption at night < 1 W
Topology No transformer
Noise 29 dB
Warranty period 5 years
Standards Compliance
Safety/EMC EN61000-6-2, EN61000-6-3, EN61000-3-2,
EN61000-3-3, EN61000-3-11, EN61000-3-12,
EN/IEC62109-1, EN/IEC62109-2
Power grid connection standard VDE-AR-N4105, VDE0126-1-1, BDEW 2008,
Enel-Guideline, CEI 0-21, G59/2, G83/1-1,
AS4777, CGC/GF004:2011, IEC61727, IEC62116, RD1669
Figure 3-2 shows the electrical diagram of the SUN2000-33/40KTL inverter.
Figure 3-2 Electrical diagram of the SUN2000-33/40KTL
Input
current
detection
DC
switch
DC SPD
Inp
ut E
MI filte
r
MPPT circuit 1
MPPT circuit 2
MPPT circuit 3
DC-AC
inverter circuit
LCL filter
Output
isolation relay
Ou
tpu
t E
MI
filte
r
AC SPD
SUN2000-40KTL
Figure 3-3 shows the SUN2000-8–28KTL inverter.
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Figure 3-3 SUN2000-8–28KTL inverter
Table 3-4 describes the specifications of the SUN2000-8–28KTL.
Table 3-4 Specifications of the SUN2000-8–28KTL
Specifications SUN2000-8KTL
SUN2000-10KTL
SUN2000-12KTL
SUN2000-15KTL
SUN2000-17KTL
SUN2000-20KTL
SUN2000-23KTL
SUN2000-24.5KTL
SUN2000-28KTL
Effici
ency
Max. efficiency 98.50% 98.60% 98.70%
European
efficiency
98.00% 98.30% 98.40%
Input Max. input
power (cosφ =
1)
9100
W
11400
W
13700
W
17100
W
19200
W
22500
W
23600
W
- 28200
W
Max. input
voltage
1000 V
Max. input
current (per MPPT)
18 A
Min. startup
voltage
200 V
Full load MPPT
voltage range
320–800 V 380–8
00 V
400–800 V 480–800 V
Rated input
voltage
620 V 680 V
Number of inputs
4 6
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Specifications SUN2000-8KTL
SUN2000-10KTL
SUN2000-12KTL
SUN2000-15KTL
SUN2000-17KTL
SUN2000-20KTL
SUN2000-23KTL
SUN2000-24.5KTL
SUN2000-28KTL
Number of
MPPTs
2 3
Outp
ut
Rated power 8000
VA
10000
VA
12000
VA
15000
VA
17000
VA
20000
VA
23000
VA
24500
VA
27500
VA
Max. AC output
power (cosφ=1)
8800
W
11000
W
13200
W
16500
W
18700
W
22000
W
- - -
Rated output
voltage
220–230 V/380–400 V, 3W+N+PE 277/48
0 V,
3W+PE
277/48
0 V,
3W+PE
Output voltage
frequency
50/60 Hz
Max. output
current
12.8
A
16 A 19.2 A 24 A 27.2 A 32 A 33.5 A
Power factor 0.8 overexcited ... 0.8 underexcited
THD < 3%
AC grid
connection
impulse current
(peak
current/duration)
33 A/2 ms
Output max.
short-current
current (peak
current/duration)
400 A/110 ms
Prote
ction
Input DC
switch
Supported
Anti-islanding
protection
Supported
Output
overcurrent
protection
Supported
Input reverse
connection protection
Supported
Fault detection
for PV strings
Supported
DC surge Class II
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Specifications SUN2000-8KTL
SUN2000-10KTL
SUN2000-12KTL
SUN2000-15KTL
SUN2000-17KTL
SUN2000-20KTL
SUN2000-23KTL
SUN2000-24.5KTL
SUN2000-28KTL
protection
AC surge
protection
Class II
Insulation
resistance
detection
Supported
RCD detection Supported
Displ
ay
and
com
muni
cation
Display Liquid crystal display (LCD)
RS485 Supported
USB Supported
Com
mon
para
meters
Dimensions (W
x H x D)
520 mm x 610 mm x 255 mm
Weight 40 kg 48 kg
Operating
temperature
–25ºC to +60ºC
Cooling mode Natural convection
Altitude 3000 m
Relative
humidity
(non-condensing)
0–100%
Input terminal
Output terminal Amphenol C16/3
Protection level IP65
Class of
protection
Class I
Pollution
degree
III
Power
consumption at night
< 1 W
Topology No transformer
Noise ≤ 29 dB
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Specifications SUN2000-8KTL
SUN2000-10KTL
SUN2000-12KTL
SUN2000-15KTL
SUN2000-17KTL
SUN2000-20KTL
SUN2000-23KTL
SUN2000-24.5KTL
SUN2000-28KTL
Warranty
period
5 years
Stand
ards
comp
liance
Safety/EMC EN/IEC62109-1, EN/IEC62109-2, EN61000-6-2, EN61000-6-3, EN61000-3-2,
EN61000-3-3, EN61000-3-11, EN61000-3-12
Power grid
connection
standard
VDE-AR-N4105, VDE0126-1-1, BDEW 2008, Enel-Guideline, CEI 0-21, CEI
0-16, G59/2, G83/2, AS4777, CGC/GF004:2011, IEC61727, IEC62116, RD1669,
EN50438, MEA 2013, PEA 2013
For details about other parameters, see the SUN2000 (8KTL-28KTL) Product Description and
Smart PV Power Plant Solution Product Catalog - Japanese Version.
3.2.3 AC Combiner Box/AC PDC
The SUN2000 AC combiner box (PDC) combines the output currents of multiple inverters or
AC combiner boxes and provides the currents to the low-voltage power grid or the
low-voltage input side of a box-type transformer. The SUN2000 AC combiner box (PDC)
applies to scenarios in which the power of the Huawei inverter is lower than 40 kW,
low-voltage (400 V AC) scenarios, or medium-voltage (480 V DC) scenarios.
Figure 3-4 AC combiner box appearance
Table 3-5 lists the SUN2000 AC PDC technical specifications.
Table 3-5 SUN2000 AC PDC technical specifications
Item Specifications
Engineering features Dimensions (H x W x D) Unpacked: 660 mm x 900 mm x 275 mm
Packed: 845 mm x 1095 mm x 420 mm
Weight Without miniature circuit breakers (MCBs): ≤ 46.2 kg
With MCBs: ≤ 54.4 kg
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Item Specifications
Without MCBs: ≤ 48 kg
With MCBs: ≤ 56.2 kg
Temperature –25ºC to +55ºC (full load at –25ºC to +50ºC; linear
derating at more than 50ºC)
Humidity 5–95% RH (non-condensing)
Altitude 0–3000 m (derating when the altitude exceeds 3000 m)
Transport/storage
temperature
–40ºC to +70ºC
Enclosure protection level IP55
Cabling Routed in and out from the bottom
Maintenance mode Maintained from the front; circuit breaker with a
protective cover
Installation mode Support-mounted or wall-mounted
Electrical specifications
Max. input voltage MCB: 400 V AC
Molded case circuit breaker (MCCB): 480 V AC
Rated insulation voltage MCB: 500 V AC
MCCB: 690 V AC
Max. branch input current MCB: 34 A
MCCB: 45 A
Max. output current 270 A
Power frequency withstand
voltage
2500 V
Bus rated operating current 270 A
Rated frequency 50 Hz
Number of inputs MCB: eight
MCCB: six
Numbers of outputs One
Surge protection level Level C
PDCs of the same dimensions may differ slightly in weight due to capacity differences.
Figure 3-5 shows the location of the AC PDC in the entire power supply and distribution
system. Use MCBs in low-voltage grid-tied scenarios and use MCCBs in medium-voltage
grid-tied scenarios.
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Figure 3-5 Location of the AC PDC in the power supply and distribution system
The SUN2000 AC PDC combines the output currents of multiple upstream SUN2000s
through the corresponding MCBs or MCCBs and level-C SPD and provides the currents to
the low-voltage input side of the box-type transformer.
Figure 3-6 and Figure 3-7 show the AC PDC power distribution principles.
Figure 3-6 Power distribution conceptual diagram (MCB)
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Figure 3-7 Power distribution conceptual diagram (MCCB)
3.2.4 Transformer
The grid-tied transformer applies mainly to medium-voltage grid-tied scenarios. It converts
the 480 V AC output voltage of the inverter to 6–35 kV voltage and then connects to the
booster station in the power distribution grid or substation in the power supply grid. In most
cases, a double-column transformer integrated with the low-voltage AC power distribution
unit is used and a communications port is reserved, reducing the system cost. Mainstream
step-up transformers used in PV power plants have a rated capacity of 800, 1000, 1250, 1600,
or 2000 kVA, a voltage of 480 V AC on the low-voltage side, and a voltage of 6–35 kV on the
high-voltage side. The low-voltage side uses delta connection and the high-voltage side uses
star connection.
In certain scenarios such as the low-voltage grid-tied scenarios in Japan, the transformer
reduces the 480 V AC output voltage of the inverter to 200 V AC before grid connection. The
step-down transformer has the same structure as the step-up transformer.
Figure 3-8 Step-up transformer appearance and conceptual diagram
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Table 3-6 Specifications of mainstream box-type transformers (1600 kVA, 480 V to 35 kV)
Item Recommended Specifications
Rated capacity 1600 kVA
Rated voltage Double-column, (36.75 kV±2) x 2.5%/0.48 kV
Rated frequency 50 Hz
Vector group number Dy11 (with low-voltage side unearthed)
Impedance voltage 6.5% (at least 6%)
Max. efficiency > 99%
European efficiency > 98.5%
System and surge protection Three-phase three-wire IT system, 3+1
pressure-sensitive modules (three 385 V and one 510 V pressure-sensitive modules)
General circuit breaker One three-pole 2500 A/690 V circuit breaker
Branch MCCB Eight three-pole 400 A/690 V MCCBs
Enclosure material Stainless steel or aluminum
Communications protocol Modbus-RTU
Communications port RS485
Others Power port reserved for the communications cabinet:
load switch and fuses (see the following table for the specifications)
Table 3-7 Box-type transformer ports reserved for the communications cabinet
Communications Power Port
Specifications Quantity Manufacturer
Fuse box CHM3DIU/690 V/32 A 1 PCS Bussmann
Fuse FWC-6A/600 V/6 A/50 kA 3 PCS Bussmann
Disconnector OT16F3/690 V/16 A 1 PCS ABB
Some low-voltage grid-tied scenarios require the use of the isolation transformer. The isolation transformer has the similar structure as the step-up transformer. The isolation transformer isolates the upstream device from the downstream device without boosting or reducing voltages.
3.2.5 Power Cable
Cable selection rules:
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− Factors to consider: cable type, soil thermal resistance coefficient, routing efficient,
PV running system features
− Basic rule: The cable must meet the current-carrying capacity, cable loss, and voltage drop requirements.
− Main constraints: current-carrying capacity, cable loss, voltage drop
− The selected cable must at least meet current-carrying capacity requirements. If the
system efficiency needs to be considered, the cable must also meet the cable loss
requirements.
Current-carrying capacity
Different design institutes may refer to different specifications:
− GB 50217-2007 Code for design of cables of electric engineering: China standard
reference for cable selection
− Electrical cable current-carrying capacity written by Ma Guodong: supplementary reference that describes more scenarios
− Industrial and civil power distribution design manual: referred to by many design
institutes. The manual provides many cable current-carrying capacity cables that
cover most scenarios.
Cable loss
Generally, the allowed ratio of total cable power loss to the total transmitted power is
less than 2%. The total cable power loss is the sum of power loss of all cables with various diameters.
Voltage drop
Generally, the voltage drop from the inverter output to the box-type transformer
low-voltage busbar (from inverter to combiner box, from combiner box to box-type
transformer low-voltage PDC) must not exceed 5% of 400/480 V AC.
Cable model
Table 3-8 Cable models
Environment Type Cable to Select in Common Conditions
Cable to Select in Damp, High Ground Water Level, or Chemical Corrosion Conditions
Direct bury ZC-YJV22-0.6/1kV-
x*xxmm2
ZC-YJV23-0.6/1kV-x*xxmm2
Direct bury (soil
displacement may
occur)
ZC-YJV32-0.6/1kV-
x*xxmm2
ZC-YJV33-0.6/1kV-x*xxmm2
Cable tray, cable
trough, tube
ZC-YJV-0.6/1kV-x*
xxmm3
ZC-YJY-0.6/1kV-x*xxmm3
Rooftop (WDZC
recommended)
WDZC-YJV-0.6/1kV
-x*xxmm3
PV dedicated PV1-F-1*xxmm2
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Table 3-9 Cable model description
Model Description Remarks
YJV Copper-core cross linked polyethylene (XLPE)
insulated polyvinyl chloride (PVC) sheath power cable
YJY Copper-core cross linked polyethylene (XLPE)
insulated polyethylene sheath power cable
Polyethylene offers
better waterproof performance than PVC.
ZC Flame-resistant level C
WDZC Low-smoke, halogen free, flame-resistant level C No toxic gas is emitted
during burning.
YJV22 Copper-core XLPE insulated steel belt armored
PVC sheath power cable
The cable can withstand
some mechanical stress.
YJV23 Copper-core XLPE insulated steel belt armored
polyethylene sheath power cable
YJV32 Copper-core XLPE insulated fine steel wire
armored PVC sheath power cable
The cable can withstand
some mechanical stress and pulling force.
YJV33 Copper-core XLPE insulated fine steel wire
armored polyethylene sheath power cable
AC/DC power cable specifications (for the 1.6 MW PV array and 40KTL inverter)
Table 3-10 Recommended cable specifications
No. Cable Specifications Remarks
1 DC cable from a module to
the inverter
600V/1000V-PV1-F
-1*4mm2-34A, PV power cable
DC cable dedicated for PV
scenarios and should not be buried
2 Cable from the inverter to
the combiner box
ZC-YJV22-0.6/1kV
-3×16mm2
Multi-core hard cable
3 AC cable from the combiner
box to the box-type transformer
ZC-YJV22-0.6/1kV
-3×150mm2
Applies to the combiner box
that combines six inputs and provides one output
4 Cable from the
communications cabinet to
the box-type transformer
ZC-YJV22-0.6/1kV
-3×4mm2
Power cable
5 Communications cable from
the box-type transformer to the communications cabinet
ZC-DJYP2VP2-22-
2*2*1.0mm2
RS485 cable
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No. Cable Specifications Remarks
6 Communications cable from
the communications cabinet to the CPE
CAT5e-SFTP4PR
24AWG
CPE power cable and
Ethernet communications cable
3.2.6 Smart Communications Cabinet
The smart communications cabinet is the communication core in the PV array unit. It collects
data from PV array devices (including the inverter, AC combiner box, box-type transformer,
and EMI), and reports the data to the power plant monitoring background through the fiber
ring network, the LTE network, or other network. This provides reliable guarantee for the
communication between the smart power plant monitoring background and array devices.
The smart communications cabinet can be equipped with the data collector, PLC
communications module, PID module, fiber ring network switch, Access Terminal Box (ATB),
PoE power source, communication management unit, and corresponding wiring terminals and
power distribution switches.
The smart communications cabinet can be wall-mounted or support-mounted. It is equipped
with front and rear doors and can be maintained from the front or rear, facilitating cable
connection and maintenance.
Table 3-11 Smart communications cabinet specifications
Category Item Specifications
Basic Cabling Routed in and out from the bottom
Maintenance mode Maintained from the front
Natural environment Outdoor
Altitude 3000 m
Installation mode Support-mounted or wall-mounted
Dimensions (W x H x D) Not greater than (600 x 1100 x 600),
including the base. The dimensions should be as small as possible.
Quality and reliability
Certification requirements /
Enclosure protection level Above IP55
Fire-resistance rating UL790 Class C
Service life 20
Environmental
adaptability
Operating ambient temperature –25ºC to +50ºC
Temperature rise inside the
chassis
10 K
Operating relative humidity Not greater than 95%
(non-condensing)
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Category Item Specifications
Environmental
protection
Huawei environmental
protection requirements (ROSH and REACH)
Compliant
Figure 3-9 Internal layout diagram of the communications cabinet
Table 3-12 Equipped components before delivery
No. Component Specifications Quantity Silk Screen Description
1 Three-pin
power socket
220 V/3 pins,
multi-purpose
3 XS1, XS2,
XS3
A two-prong
or three-prong
plug can be
inserted.
2 SPD 480 V/20 kA/3P 1 FS -
3 Input MCB 480 V/32 A/3P 1 AC INPUT -
4 MCB 480 V/6 A/3P 1 PID INPUT
5 Input terminal 480 V/32
A/3-pin
1 X1 Labels: L1,
L2, L3, and N
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No. Component Specifications Quantity Silk Screen Description
6 Power transfer
terminal block
480 V/32
A/8-pin
1 X1 Labels: A1,
A2, A3, B1,
B2, B3, C1,
C2, C3, N1,
and N2
7 Output power
terminal block
480 V/32
A/4-pin
1 X1 Labels: L, L,
N, and N
8 Output fuse 220 V/2 A/2P 2 FU1, FU2 -
9 Signal
terminal block
12 V/5 A/8-pin 1 X2 Labels: A4,
B4, A5, B5,
A6, B6, A7, and B7
10 PID module - 1 - -
Figure 3-10 shows the appearance and dimensions of the communications cabinet.
Figure 3-10 Communications cabinet appearance and dimensions
Figure 3-11 shows the top view of the communications cabinet bottom.
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Figure 3-11 Top view of the communications cabinet bottom
(1) General power input port (2) PE input port (3) Fiber input port
(4) RS485 input port for connecting the data collector (5) Antenna input port
The communications cabinet can be equipped with or without the PID module before
delivery.
Figure 3-12 shows the conceptual diagram of the communications cabinet equipped with the
PID module before delivery. The diagram is the same for the communications cabinet without
the PID module except that the PID module is absent.
Figure 3-12 Conceptual diagram of the communications cabinet before delivery
Figure 3-13 shows the conceptual diagram of the communications cabinet equipped with the
internal devices.
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Figure 3-13 Conceptual diagram of the communications cabinet equipped with the internal
devices
Remarks:
If there is no smart communications cabinet, devices such as the data collector and PLC
communications module are installed in the box-type transformer in most cases.
The box-type transformer must reserve guide rails for installing devices so that other optional
devices including the data collector can be installed. The box-type transformer needs to
reserve two to three 220 V three-pin power sockets (also support two-prong plugs) to function
as the power access point for the data collector, PoE power source, and PLC module. If the
reserved three-pin power sockets are insufficient, add a 220 V three-pin power strip to provide
more three-pin power sockets.
During the product solution design phase, the installation position, mounting method, and
layout scheme need to be finalized and the corresponding hole dimensions (see the user
manual for details) requirements need to be sent to the design institute as a reference for
figure design.
3.2.7 Data Collector
The SmartLogger data collector is dedicated for monitoring and managing the PV power
system. It converges all ports, converts protocols, collects and stores data, and centrally
monitors and maintains the PV power system.
A maximum of 30 devices can be connected over an RS485 route in series and a maximum of 80
devices can be connected in total.
If the EMI is required, connect it to the end terminal and set the EMI address to 1.
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Figure 3-14 Front view of the data collector
Table 3-13 Data collector specifications
Specifications SmartLogger1000
Device
management
Maximum number of
devices that can be managed
80
Communication mode 3 x RS485
Maximum communications
distance
RS485: 1000 m; Ethernet: 100 m
Display LCD 3.5-inch LCD screen
LED Three LED indicators
Web WebUI
Common
parameters
Power source 90–270 V AC, 50/60 Hz
Power consumption Normal: 3 W; maximum: 7 W
Storage capacity 70 MB flash, can be expanded to 16 GB by
configuring an SD card.
Language English, Chinese, German, Italian
Dimensions 255 mm x 140 mm x 50 mm
Weight 500 g
Operating temperature –25ºC to +60ºC
Relative humidity 0–95% (non-condensing)
Protection level IP20
Installation mode Installed on a wall, desk, or along a guide
rail.
Ports Ethernet 10/100M, Modbus-TCP
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Specifications SmartLogger1000
RS485 Three Modbus-RTU ports
Digital input (DI) 4
Analog input (AI) 2
Relay output 3
3.2.8 PID Module
PID means potential induced performance degradation in PV modules. During the running of
power plant modules, as the modules are grounded, some modules in the string are running
with a negative voltage to the ground. Due to the negative voltage, PID occurs in PV modules.
PID is likely to occur in a damp environment and the PID is accelerated by high humidity.
The PID effect is also related to the electrical conductivity, acidity, and alkalinity of PV
module surfaces and presence of objects with ions on the PV module surfaces. The PID effect
reduces the electric energy yield of the power plant, affecting revenues. The Huawei PID
module is installed in the communications cabinet to control the injection of AC voltage to the
ground. The PID module automatically adjusts the output voltage based on the inverter
voltage so that the voltage of all PV modules to the ground is positive. In this way, the PID
effect is prevented.
Working Principles
The PID module is installed in the communications cabinet and used with the cabinet. It
cannot be used independently. The PID module controls the injection of AC voltage to the
ground. It automatically adjusts the output voltage based on the inverter voltage so that the
voltage of all PV modules to the ground is positive.
Figure 3-15 Conceptual diagram for PID module installation
Inverter 1
Inverter n
AC combiner box
RS485
n
1
Data
collector
PID
Communications
cabinet
Medium-voltage
power grid
A/B/C
N
Power
source
PE
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Appearance
The PID module dimensions (L x W x H) are 350 mm x 225 mm x 81.5 mm.
Figure 3-16 PID module appearance
Cable Installation
The PID module is installed in the communications cabinet, as shown in Figure 3-15. The
following table describes the cables to be installed. The three-phase AC power cable needs to
be connected to wiring terminals A, B, and C from the cabinet bottom. The PE terminal of the
PID module needs to be connected to the terminal block in the communications cabinet. The
data collector is connected to inverters using an RS485 cable, and connected to the PID
module inside the communications cabinet. For details about the communications cabinet, see
section 3.2.6 "Smart Communications Cabinet."
No. Signal Source
1 Three-phase AC power Combiner box or the low-voltage side of the step-up transformer
2 PE PGND bar
3 RS485 communication Data collector
3.2.9 Ring Network Switch
A ring network switch is required when the fiber ring network is used for networking. The
Huawei AR550-series industrial switching routers are dedicated for harsh environments. They
can meet the network communication requirements in environments with harsh temperatures,
humidities, and electromagnetic interference. The Huawei AR550-series switching routers
integrate functions such as routing, switching, and IPSec VPN. They have strong application
expansion capabilities.
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The AR550-series have two models: AR550-8FE-D-H and AR550-24FE-D-H.
Model Specifications
AR550-8FE-D-H
Fixed ports: 4 x GE combo, 8 x FE RJ45, 1 x USB2.0, 1 x Do
Operating temperature: –40ºC to +70ºC
Dimensions (W x D x H): 97 mm x 133 mm x 150 mm
Redundant power supply (RPS): 9.6–60 V DC
AR550-24FE-D-H
Fixed ports: 4 x GE combo, 24 x FE RJ45, 1 x USB2.0, 1 x Do
Operating temperature: –40ºC to +70ºC
Dimensions (W x D x H): 133 mm x 133 mm x 150 mm
RPS: 9.6–60 V DC
For details about the AR550-series devices, see the Huawei AR550-Series Industrial
Switching Router Brochure.
3.2.10 Other Monitoring and Communication Devices
See chapters 4 "Solution Scenarios" and 5 "FusionSolar Smart PV Management System".
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4 Solution Scenarios
4.1 Overview
The smart PV power plant solution applies mainly to low- and medium-voltage grid-tied
scenarios. This chapter describes the networking in the two scenarios. The low-voltage or
medium-voltage grid-tied scenario consists of the smart PV power plant monitoring
networking (illustrated in sections 4.4 "Smart PV Power Plant Monitoring Networking
Solutions" and 4.5 "4G LTE Dedicated Network Solution") and the FusionSolar smart PV
management system (described in chapter 5 "FusionSolar Smart PV Management System").
4.2 Low-Voltage Grid-tied Scenario System composition
Figure 4-1 Low-voltage grid-tied scenario
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In the low-voltage grid-tied scenario:
− Capacity: In some cases, the power grid capacity is required to be no greater than
25%–30% of that of the distribution transformer. If the power grid capacity exceeds
the 25%–30% of that of the distribution transformer, the PV energy needs to be delivered to a power grid with a higher capacity.
− Distribution transformer: The transformer already exists. According to the power
distribution specifications, the N cable is connected to the PE cable on the
transformer side. There is voltage between the DC cable and the PE cable. If the PV– to the ground is short-circuited, short-circuit may occur inside the inverter.
− Output power cable: The N cable must be used. All low-voltage grid-tied standards
are based on the N cable. If the N cable is not used, it will be difficult to meet the
single-phase islanding requirements.
− Communication: Use RS485 or PLC for communication based on the actual situation.
− RCD protection: As the N cable and PE cable are connected, if the impedance of the
input to the PE cable becomes lower, residual current will exist. According to the
requirements in standards, the RCD is used to protect against personal injuries and
fire.
− PID protection: If the PID module is required in a low-voltage grid-tied scenario, an isolation transformer must be installed before the grid-feeding point.
Devices in the low-voltage grid-tied scenario
Table 4-1 Devices in the low-voltage grid-tied scenario
Input PV panel
Output Three-phase low-voltage power grid (phase voltage: 220/230 V AC)
Configurations Inverter: SUN2000-8–20/33KTL
AC PDC (An AC switch is required for each inverter output, and the
switch is generally provided by the system integrator.)
(Optional) EMI, which is provided by the system integrator.
Distribution transformer (local power distribution grid)
Monitoring See sections 4.4 "Smart PV Power Plant Monitoring Networking
Solutions" and 4.5 "4G LTE Dedicated Network Solution") and chapter 5 "FusionSolar Smart PV Management System".
4.3 Medium-Voltage Grid-tied Scenario System composition
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Figure 4-2 Medium-voltage grid-tied scenario
In the medium-voltage grid-tied scenario:
− On-grid unit: Generally, 1–2 MW PV panels form an on-grid unit. The transformer
high-voltage side voltage is generally 10 kV or 35 kV. Communication data needs to
be connected to the central monitoring room through the monitoring network (fiber ring network, 3G/4G router, 4G LTE dedicated network).
− Booster power station: In most cases, large-sized PV power plants require a booster station that boosts 35 kV to 110 kV or 220 kV.
− Step-up transformer: In most cases, the N cable is not connected to the PE cable and
there is no residual current circuit. There is no voltage between the DC side and the PE cable. Therefore, a discharge current will not be formed through the inverter.
− Output power cable: The AC side mostly uses the delta connection without the N cable.
− Communication: PLC is recommended for communication.
Devices in the medium-voltage grid-tied scenario
Table 4-2 Devices in the medium-voltage grid-tied scenario
Input PV panel
Output Medium-voltage power grid (6–35 kV)
Configurations Inverter: SUN2000-28/40KTL (low-voltage side: 480 V AC)
AC PDC
(Optional) EMI, which is provided by the system integrator.
(Optional) PID module
(Optional) Communications cabinet
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Input PV panel
Step-up transformer (provided by the system integrator)
Pooling station devices, including the switch station and AGC/SVG
(provided by the system integrator)
Monitoring See sections 4.4 "Smart PV Power Plant Monitoring Networking
Solutions" and 4.5 "4G LTE Dedicated Network Solution") and chapter 5 "FusionSolar Smart PV Management System".
4.4 Smart PV Power Plant Monitoring Networking Solutions
Inverters inside the power plant arrays can use RS485 (applies to all SUN2000 inverter
models) or PLC (applies to SUN2000-33/40KTL) for communication. A power plant mostly
uses the fiber ring network, 3G router, or 4G LTE dedicated network for communication. Six
solutions are available for power plant-level monitoring networking. For large-sized power
plants, the PLC+4G LTE dedicated network solution is recommended for better
cost-effectiveness and reliability. For scenarios in unsuitable for routing optical fiber, the 4G
LTE dedicated network solution is recommended.
4.4.1 RS485+Fiber Ring Network Solution
Solution topology
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Figure 4-3 Topology of the RS485+fiber ring network solution
If the box-type transformer supports the Modbus protocol, the SmartLogger can connect to the box-type transformer over RS485. The box-type transformer with the inverter or the transformer alone can be connected to one RS485 port of the SmartLogger. If the box-type transformer supports the IEC103 protocol, it can connect to the RS485 or RS232 port of the SmartLogger. It is recommended that the box-type transformer alone be connected to the RS485 port.
Application scenarios
− Applies to all SUN2000 PV inverters.
− Applies to large-sized ground power plants, a few mountain power plants suitable for
routing optical fiber, and industrial base rooftop power plant projects for which optical fibers are planned or cable trenches are available.
Solution features
− Broad optical fiber frequency and large communication capacity
− Long communication distance of the selected single-mode fiber (SMF): 1–20 km
− High communication reliability and superb anti-electromagnetic interference
capability offered by optical fiber. The raw materials of optical fiber consist of insulator materials made of quartz, which are difficult to corrode and provide good
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insulation. An important feature related to optical fiber is that optical wavefiber is
immune to electromagnetic interference. Optical fiber is not affected by thunder,
ionosphere change, or sunspot activities in the natural environment or manual electromagnetic interference.
Minimum Order Quantity (MOQ) for devices
Table 4-3 MOQ for devices in the RS485+fiber ring network solution
No. Device
1* Communications cabinet
2 Data collector
3 Huawei ring network switch
4 ATB
5 Pigtail
* If there is no communications cabinet in a project, other devices listed in the MOQ are
installed in the box-type transformer in most cases.
4.4.2 RS485+4G LTE Dedicated Network Solution
Solution topology
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Figure 4-4 RS485+4G LTE solution topology
If the box-type transformer supports the Modbus protocol, the SmartLogger can connect to the box-type transformer over RS485. The box-type transformer with the inverter or the transformer alone can be connected to one RS485 port of the SmartLogger. If the box-type transformer supports the IEC103 protocol, it can connect to the RS485 or RS232 port of the SmartLogger. It is recommended that the box-type transformer alone be connected to the RS485 port.
Application scenarios
− A 4G LTE dedicated network in standard configuration applies to a power plant with
a distance less than 10 km. If the distance is longer, signals cannot cover the power plant and additional devices are required.
− The solution applies to power plants in mountainous areas, which are unsuitable for
routing optical fiber or power plants in the industrial base where multiple factory
rooftops are unsuitable for routing optical fiber.
Solution features
− Quick deployment, a coverage of 10 km by a single power plant, 60 Mbit/s
bandwidth provided by each base station (three sectors), no trench required for burying optical cables
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− Low delay, high security, wireless end-to-end transmission delay less than 50 ms,
safety and reliability of carrier-class devices reaching up to 99.999%
− Easy O&M (flat network), channels that support maintenance, reducing communication interruption caused by device faults
MOQ for devices
Table 4-4 MOQ for devices in the RS485+LTE network solution
No. Device
1 Communications cabinet
2 Data collector
3 PoE power source
4 CPE terminal
5 4G LTE devices (see xxx for details)
* If there is no communications cabinet in a project, other devices listed in the MOQ are
installed in the box-type transformer in most cases.
4.4.3 PLC+4G LTE Dedicated Network Solution
Solution topology
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Figure 4-5 PLC+4G LTE solution topology
If the box-type transformer supports the Modbus protocol, the SmartLogger can connect to the box-type
transformer over RS485. The box-type transformer with the inverter or the transformer alone can be connected to one RS485 port of the SmartLogger. If the box-type transformer supports the IEC103 protocol, it can connect to the RS485 or RS232 port of the SmartLogger. It is recommended that the box-type transformer alone be connected to the RS485 port.
Application scenarios
− The PLC networking applies only to the SUN2000-33KTL and SUN2000-40KTL.
− A 4G LTE dedicated network in standard configuration applies to a power plant with
a distance less than 10 km. If the distance is longer, signals cannot cover the power plant and additional devices are required.
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− The solution applies to power plants in mountainous areas, which are unsuitable for
routing optical fiber or power plants in which multiple factory rooftops are unsuitable for routing optical fiber.
Solution features
− No RS485 communications cables required, improving communication reliability and efficiency
− Quick deployment, a coverage of 10 km by a single 4G LTE network, 60 Mbit/s
bandwidth provided by each base station (three sectors), no trench required for burying optical cables
− Low delay, high security, wireless end-to-end transmission delay less than 50 ms, safety and reliability of carrier-class devices reaching up to 99.999%
− Easy O&M (flat network), channels that support maintenance, reducing communication interruption caused by device faults
MOQ for devices
Table 4-5 MOQ for devices in the PLC+LTE network solution
No. Device
1* Communications cabinet
2 Data collector
3 PLC module
4 PoE power source
5 CPE terminal
6 4G LTE devices (see xxx for details)
* If there is no communications cabinet in a project, other devices listed in the MOQ are
mostly installed in the box-type transformer.
4.4.4 PLC+Fiber Ring Network Solution
Solution topology
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Figure 4-6 Topology of the PLC+fiber ring network solution
If the box-type transformer supports the Modbus protocol, the SmartLogger can connect to the box-type transformer over RS485. The box-type transformer with the inverter or the transformer alone can be connected to one RS485 port of the SmartLogger. If the box-type transformer supports the IEC103 protocol, it can connect to the RS485 or RS232 port of the SmartLogger. It is recommended that the box-type transformer alone be connected to the RS485 port.
Application scenarios
− The PLC networking applies only to the SUN2000-33KTL and SUN2000-40KTL.
− The maximum Ethernet communication distance between the power plant monitoring
room and the data collector exceeds 100 m.
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Solution features
− PLC used for communication and therefore no RS485 communications cables
required, improving communication reliability and efficiency
− Broad optical fiber frequency and large communication capacity. The optical fiber provides much higher transmission bandwidth than copper or electrical cables
− Long communication distance of the selected SMF: 1–20 km
− High communication reliability and superb anti-electromagnetic interference
capability offered by optical fiber. The raw materials of optical fiber consist of
insulator materials made of quartz, which are difficult to corrode and provide good
insulation. An important feature related to optical fiber is that optical wavefiber is
immune to electromagnetic interference. Optical fiber is not affected by thunder,
ionosphere change, or sunspot activities in the natural environment or manual
electromagnetic interference.
MOQ for devices
Table 4-6 MOQ for devices in the PLC+fiber ring network solution
No. Device
1* Communications cabinet
2 Data collector
3 Ring network switch
4 ATB
5 Pigtail
6 PLC module
* If there is no communications cabinet in a project, other devices listed in the MOQ are
mostly installed in the box-type transformer.
4.4.5 RS485+3G Solution
Solution topology
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Figure 4-7 RS485+3G solution topology
Application scenarios
− The 3G network signal (such as by China Mobile, China Unicom, or China Telecom) is available.
− Wireless communication is available in places where wired communication such as
Ethernet is unavailable.
− The monitoring sites are dispersed and away from each other or on factory or
residential block rooftops that are unsuitable for routing optical fiber.
Solution features
− There is no limit on the communications distance.
− Data traffic fees need to be paid to 3G operators (such as China Mobile, China Unicom, or China Telecom) by month or by year.
− The monitoring background system can be the Huawei NetEco or a third-party
electrical supervisory control and data acquisition (SCADA) system. If a third-party
electrical SCADA system is used, data between the SmartLogger and the SCADA system is transmitted using plaintext and SSL encryption is not supported.
− The server or PC on which the monitoring background system is to be installed must have a fixed public network IP address.
MOQ for devices
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Table 4-7 MOQ for devices in the RS485+3G network solution
No. Device
1* Communications cabinet
2 Data collector
3 3G router power supply
4 (choose one from three) 3G router (China Unicom) **
3G router (China Mobile)
3G router (China Telecom)
5 (choose one from three) 3G data card (China Unicom)
3G data card (China Mobile)
3G data card (China Telecom)
* If there is no communications cabinet in a project, other devices listed in the MOQ are
mostly installed in the box-type transformer.
** The China Unicom 3G router is recommended.
4.4.6 PLC+3G Solution
Solution topology
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Figure 4-8 PLC+3G solution topology
Application scenarios
− The 3G network signal (such as by China Mobile, China Unicom, or China Telecom)
is available.
− Wireless communication is available in places where wired communication such as Ethernet is unavailable.
− The monitoring sites are dispersed and away from each other or on factory or residential block rooftops that are unsuitable for routing optical fiber.
− The PLC networking applies only to the SUN2000-33KTL and SUN2000-40KTL.
Solution features
− There is no limit on the communications distance.
− Data traffic fees need to be paid to 3G operators (such as China Mobile, China Unicom, or China Telecom) by month or by year.
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− The monitoring background system can be the Huawei NetEco or a third-party
electrical SCADA system. If a third-party electrical SCADA system is used, data
between the SmartLogger and the SCADA system is transmitted using plaintext and SSL encryption is not supported.
− The server or PC on which the monitoring background system is to be installed must
have a fixed public network IP address.
MOQ for devices
Table 4-8 MOQ for devices in the PLC+3G network solution
No. Device
1* Communications cabinet
2 Data collector
3 PLC module
4 3G router power supply
5 (choose one from three) 3G router (China Unicom)
3G router (China Mobile)
3G router (China Telecom)
6 (choose one from three) 3G data card (China Unicom)
3G data card (China Mobile)
3G data card (China Telecom)
* If there is no communications cabinet in a project, other devices listed in the MOQ are
mostly installed in the box-type transformer.
4.5 4G LTE Dedicated Network Solution
Refer to this section only when the 4G LTE dedicated network solution is selected.
4.5.1 Frequency Band
The 1.8 GHz frequency band (1785–1805 MHz) is supported, and the frequency bandwidth
can be 5 MHz, 10 MHz, or 20 MHz (recommended).
4.5.2 Frequency Band Application
The LTE dedicated frequency band needs to be applied for from the wireless management
committee in the project area before it can be used. In most cases, lease fees are required for
the frequency band use. According to the notice on the charge for frequency band usage for
new wireless services released by China's National Development and Reform Commission,
the frequency band usage fee required for each base station is 150 RMB. The process for
applying for a frequency band is as follows:
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4.5.3 Performance
When the frequency bandwidth is 20 MHz, the maximum downlink rate per cell is 100 Mbps;
and the maximum uplink rate is 50 Mbps, and the average uplink rate is 18 Mbps.
4.5.4 Distributed Architecture and Coverage Distance
A distributed base station separates the remote radio unit (RRU) from the baseband unit
(BBU). The RRU and BBU are connected using optical fiber. This minimizes the feeder loss
and helps improve the coverage area of the base station. The base station can cover a radius of
7 km in flat and open areas and cover a radius of 3 km in mountainous areas. The specific
coverage area needs to be determined based on the site survey results. The RRU is no longer
limited to the equipment room. It supports flexible installation modes, such as pole-mounted
or wall-mounted. The BBU can be installed in the APM30H outdoor cabinet or in the N610E
indoor integrated power and device cabinet.
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4.5.5 Site Types
The LTE transmission system uses the BBU530 and supports two cells in basic configuration
and supports a maximum of 12 cells.
The LTE transmission system uses the 1.8 GHz 4T4R RRU. A 4T4R RRU can be used as two
2T2R RRUs (a 4T4R RRU supports two sectors/cells). Three cells require two RRUs. One
sector requires an antenna. The coverage area of each antenna is 90–120 degrees. Antennas
need to be pole-mounted. When pole-mounted 12 meters above the ground, antennas can
cover about 5 km in open areas. The specific height for pole-mounting antennas needs to be
determined based on the site survey results. The following table describes configuration of a
base station for a power plant.
Site Type/Quantity BBU RRU Antenna (= Sector)
Recommended PV Power Plant Capacity
S1 1 1 1 20 MW
S11 1 1 or 2 2 100 MW
S111 1 2 3 200 MW
S1 site type: A sector is used with the directional antenna. The coverage angle is 90–120 degrees.
S11 site type: Two 2T2R directional antennas are used. Two sectors are supported. The
coverage angle is 180–240 degrees. The S11 site is typically used in PV power plants.
When the frequency bandwidth is 20 MHz, the uplink rate can reach 38–48 Mbps. The
two sectors can be deployed by one RRU or by two RRUs. The actual deployment needs to be determined based on the site requirements.
S111 site type (not commonly used): Four sectors are used with the antenna. The S111
site applies to PV power plants. When the frequency bandwidth is 20 MHz, the uplink
rate can reach 72–90 Mbps. In most cases, an S111 base station consists of a BBU and
two RRUs. The BBU requires an additional baseband board, and the two RRUs can be deployed separately based on the location requirements.
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4.5.6 4G LTE Dedicated Network Base Station Devices
No. Device Model
Description Mandatory/Optional
Quantity Configuration Description
1 Smart PV power plant
broadband wireless
data transmission
system
2 Data transmission
control center
3 PV_eBB
U
PV broadband wireless
BBU
Mandatory 1 One set is required, including one
BBU530 that supports three cells
and the BBU auxiliary material bag.
If more than three cells need to be
supported, baseband boards need to be added.
3 PV_DCe
RRU
PV broadband wireless
RRU (DC)
Mandatory
(choose at
least one from two)
m The RRU contains one 1.8 GHz
4T4R RRU3232 that uses DC
power supply and the RRU
auxiliary material bag. It supports
two 2T2R sectors. Configure the
RRU based on the number of
sectors required.
3 PV_ACe
RRU
PV broadband wireless
RRU (AC)
m The RRU contains one 1.8 GHz
4T4R RRU3232 that uses AC
power supply and the RRU
auxiliary material bag. It supports
two 2T2R sectors. Configure the
RRU based on the number of
sectors required. AC RRUs and DC
RRUs can co-exist.
3 PV_DirA
ntenna
PV broadband wireless
base station directional antenna
Mandatory m Configure an antenna for each
sector.
3 PV_ePwr
Cab
PV broadband
integrated power and device cabinet
Mandatory 1 Configure one integrated cabinet.
The 2.2 m high cabinet can be
equipped with one set of core
network devices, one BBU, two
switches or routers, one eOMC
server, one recording server, one
disk array, and one dispatching
console. The cabinet power source
01060768 is required to supply
power to the core network devices
and BBUs. The DC distribution unit
(DCDU) 01060769 is required to
supply power to BBUs and RRUs.
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No. Device Model
Description Mandatory/Optional
Quantity Configuration Description
3 PV_ETP
48300
PV broadband power
module in the indoor
cabinet
Mandatory 1 Install the power module in the
01060774 large indoor cabinet. The
power module is directly delivered by Huawei.
3 PV_DCD
U03B
PV broadband DCDU Mandatory 1 Install the DCDU in the 01060774
large indoor cabinet. The DCDU is directly delivered by Huawei.
3 PV_eSCN
PV broadband wireless core network devices
Mandatory m Core network devices include one
set of 4 U high core network
hardware SCN230 and basic
auxiliary material bag. Configure
one set of core network devices
when there is one base station is
required for one power plant.
Configure two sets of core network
devices if the production data is
separated from the safety protection
data or in active/standby scenarios,
and configure three sets in
active/standby scenarios where the
production data is separated from
the safety protection data. It is
recommended that one set of core
network devices be deployed. If
customers require partitioning,
configure two sets to separate production from management.
3 PV_eOM
C-PC
PV broadband smart
network management PC
Optional m Configure desktop PCs (can be
prepared by customers) or servers.
The number of PCs required is the
same as the number of core network device sets.
PCs also need to be configured in
the broadband cluster control center
and the expanded dispatching
console. The PCs are directly delivered by Huawei.
3 PV_eSwi
tch
PV broadband router Optional
(choose one
from two)
m Common 24-port FE/GE port. The
number of switches to be
configured is the same as the
number of set of core network
devices. If the customers already
prepared the switches, do not
configure switches. The switches are directly delivered by Huawei.
3 PV_eRou
ter
PV broadband router m The router is recommended.
Configure routers in active/standby
scenarios or when the Tunnel
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No. Device Model
Description Mandatory/Optional
Quantity Configuration Description
protocol is required, to substitute for
switches. The number of routers to
be configured is the same as the
number of set of core network
devices. The routers are directly delivered by Huawei.
3 PV_Pole
ASM
PV broadband wireless
base station pole
Mandatory m It is recommended that customers
prepare poles. The pole code can be
obtained from TD Tech.
Alternatively, maintenance and
service personnel can apply for a
temporary code. Install an antenna
on each pole. Select 1 m, 3 m, or 6
m poles based on the site survey
results. The number of poles
required is the same as the number
of antennas. The RRU and an antenna can share a pole.
3 PV_ePwr
ODCab
PV broadband outdoor
power and device
cabinet
Optional m When the base station (BBU/RRU)
is more than 100 m away from the
central control room, configure an
outdoor cabinet to supply power to
the BBU and RRU. The outdoor
cabinet is directly delivered by
Huawei.
3 PV_Node
B-SW_00
PV broadband wireless
system software
Mandatory 1 Configure one set of the software.
The software includes the base
station basic function software, six
sector software, 20 MHz frequency
band software, network
management software, and core
network basic software. A
maximum of 500 core network
subscribers can access the software
and the core network sector access
software supports a maximum of six
sectors (the scenario with two S111 base stations is supported).
3 PV_Node
B-SW_01
PV broadband wireless
system software
(capacity expansion to double areas)
Optional 1 Configure a set of the software
when dual areas are required to
separate the production data from
the safety protection data. The set
includes the network management
software, double area software, and
core network basic software. A
maximum of 450 core network
subscribers are allowed to access
the software.
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No. Device Model
Description Mandatory/Optional
Quantity Configuration Description
2 Wireless data access
system
3 PV_CPE PV broadband wireless data access terminal
Mandatory m Configure a CPE for each array and
a CPE for each camera. The CPE
includes the PoE power supply,
software, and basic auxiliary
material bag. The CPE enclosure
can be used as the plate antenna.
The number of CPEs must be the
same as the number of cameras.
Determine the number of CPEs
required based on the safety
protection requirements of the
project.
1 Smart PV power plant
broadband cluster communication system
2 Cluster communication
control center
3 PV_Med
Crtl
PV broadband wireless
cluster communication control center
Mandatory 1 Configure one set of the control
center. The control center includes
the dispatching server, PC used for
installing the dispatching console
software (the PC is equipped with a
speaker, PPT microphone, and an
MRS610 recorder). If there are
multimedia requirements, configure
one set of the control center per
power plant. A maximum of 40
dispatching consoles are supported.
The control center configured to
meet multimedia requirements
includes a dispatching console and a
1.2 TB hard disk. The control center
also includes the base station cluster
software (supports 10 sectors), core
network cluster software,
dispatching server software,
dispatching console software, video
concurrency software (supports 100
D1, 50 720P, or 25 1080P video
channels) that supports four D1, two
720P, or one 1080P concurrent
video channel and 20 audio
channels. A PC is required for the control center.
3 PV_eOMC-PC
PV broadband smart
network management
Optional 1 The PC can be prepared by users or
share a PC with the NMS. It is used
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No. Device Model
Description Mandatory/Optional
Quantity Configuration Description
PC with the cluster communication
control center to display video data.
The PC is directly delivered by Huawei.
3 PV_Med
VisAud
PV broadband
multimedia voice and
video decoder
Optional m Configure the decoder when videos
need to be projected onto a screen.
The decoder can decode videos
from 16 D1, eight 720P, or four 1080P channels.
3 PV_Med
CrtlExt
PV broadband
multimedia control
expanded dispatching console
Optional m Each dispatching console supports
16 D1, eight 720P, or four 1080P
video channels. A PC is required for the dispatching console.
3 PV_eOM
C-PC
PV bandwidth smart
network management PC
m The PC is used with the expanded
dispatching console to display
videos. The PC is directly delivered
by Huawei.
3 PV_Disk
Ext12
Twelve PV broadband
expanded disk arrays
Optional 1 The device twelve 1.2 TB hard
disks. The hard disks can store 720P
videos from eight channels for 2.25 months.
3 PV_Disk
Ext20
Twenty PV broadband
expanded disk arrays
Optional 1 The device twenty 1.2 TB hard
disks. The hard disks can store 720P
videos from eight channels for 3.75 months.
2 Cluster communication
handheld terminal
3 PV_Mobi
le
PV broadband wireless
cluster multimedia
handheld terminal
Optional m The terminal is a 1080P handheld
terminal used for inspection.
Configure a minimum of three
handheld terminals and configure
one more for each additional 5 MW.
The terminals must be configured
when the cluster function is required.
The quantity m varies depending on the application scenario and customer requirements.
CPE terminals support various external IP cameras. However, if cameras need to be accessed and controlled by the TD Tech dispatching console, the following cameras are supported:
− Tested and verified Huawei cameras (UC&C products): integrated box camera IPC6111-L1-I
(02410761, supports 1.4 G/1.8 G, see the product documentation for details), box camera IPC6121-I (02410756), and dome camera IPC6521-Z20-I (02410804).
− Hikvision camera DS-2DF5284-A
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For details about the base station devices, see the Huawei Smart PV Power Plant Broadband
Wireless System Configuration Manual.
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5 FusionSolar Smart PV Management System
5.1 FusionSolar Smart PV Management System
5.1.1 Introduction
The monitoring and management system is usually deployed locally for PV power plants.
Major monitoring and production management operations are performed on the power plant
side. However, as plant owners increase the scale, PV power plants may cover hundreds of
power stations in China or even across the globe. Against the backdrop of increasing PV
power plant scale, problems brought by single plant operation, for example, the cost is high,
data cannot be shared, and the plant operating quality cannot be evaluated, become prominent.
The demand for a centralized operation and maintenance center is becoming stronger. The
operation of multiple power plants poses higher requirements for automatic operation
monitoring and production management, plant operation evaluation and maintenance,
networking, and system reliability. To address the preceding PV power plant development
trends and customers' requirements, Huawei launched the FusionSolar smart PV management
system, which features the following:
Implements centralized management and O&M for multiple power plants based on the
centralized management and O&M in cloud computing.
Implements intelligent O&M and analysis based on big data analysis, increasing energy yield for power plants.
Improves O&M efficiency by adopting the new operation and maintenance mode that covers professional PV terminals and app.
Improves data transmission reliability, deployment flexibility, and system scalability by
using the innovated transmission and networking solutions, the LTE broadband
transmission and PLC technologies.
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Smart O&M Cloud Center ePMS720
The smart O&M cloud center ePMS720 enables customers to efficiently manage their global
power plants in a centralized way, thereby improving power plant management and O&M
efficiency, increasing energy yields, and reducing management costs. The ePMS720 performs
the following functions:
Manages data of dozens of GW and hundreds of power plants, stores hundreds of TB
data for 25 years, and implements the sound rights control and authentication mechanisms to ensure data security.
Supports access of multiple power plants and addition of new power plants, manages
power plants in different places across the globe as local logical power plants, and
analyzes the completion of the annual and monthly energy yield plans and O&M investment to help executives in decision and analysis.
Summarizes the production data of multiple power plants for converged analysis to form
a set of key performance indicators (KPIs) across different power plants. The KPIs are
used to evaluate the operation and health status of the power plants so that the weak points can be found and optimization suggestions can be raised.
Power Plant Production Management System ePMS710
The power plant production management system ePMS710 manages production operation and
routine office work in electronic and mobile way to improve plant management and operation
efficiency. The ePMS710 performs the following functions:
Manages tickets in electronic and mobile way, shortening ticket handling time and reducing energy yield loss due to faults.
Implements O&M analysis and equipment evaluation to precisely analyze and evaluate personnel, equipment, and events, thereby improving O&M efficiency.
Power Plant Monitoring System eSCS910
The power plant monitoring system eSCS910 monitors and manages PV pooling stations and
PV electricity generation equipment in real time to promptly and precisely locate faults,
thereby improving power plant O&M efficiency. The eSCS910 performs the following
functions:
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Uses a string solution to monitor strings at high precision and rapidly identify faulty
modules.
Locates faults precisely, analyzes associative alarms, and provides alarm handling suggestions to help onsite personnel easily locate and analyze faults.
Implements real-time monitoring based on the physical locations of equipment, logical topology, and electric wiring diagram. Monitoring data is displayed.
PV Terminal and O&M App
The PV terminal and O&M app (require the support of the eLTE smart PV broadband
transmission system) provide mobile O&M and inspection methods:
Provide multiple service functions, such as the power plant list, alarm management,
alarm query, ticket management, asset management, and operating reports, to support power plant O&M.
Provide a new mobile O&M mode without location limitations to enable mobile and
electronic operation and work tickets, improving O&M efficiency.
FusionSolar App
The FusionSolar app allows users to query the group and plant KPIs using a mobile phone.
Shows the layout of all power plants in the group and the plant operating status, provides
various operating data to plant managers, such as electricity generation reports, energy
yield statistical analysis, plant operating analysis, device operating analysis, and O&M
evaluation.
Allows investors to have access to the operating status and results of power plants.
5.1.2 FusionSolar Devices
For details about the FusionSolar devices, see the following documents:
FusionSolar V200R001C00 IES2.0 Smart PV Power Plant Management System Configuration Manual
FusionSolar V200R001C00 Management System IES2.0 Configuration List
FusionSolar Smart PV Management System Product Description
5.2 NetEco 1000S Smart PV Power Plant Management System
5.2.1 Introduction
As a plant-level monitoring solution, NetEco 1000S can run on the Windows operating
system and can be accessed through a web browser. You can log in to NetEco 1000S using
any PC with Internet access. NetEco 1000S enables you to monitor the KPIs and alarms of the
PV inverters in real time and remotely control and manage the inverters. NetEco 1000S can
be connected to a maximum of 1500 devices. It is smart and flexible. It allows mobile smart
terminals to access it at any time and sends alarms and energy yield reports. NetEco 1000S is
stable and reliable. It implements rights- and domain-based management. You can also access
the NetEco 1000S app using a mobile phone or tablet running an OS later than Android 4.0 or
an iPhone or iPad running an iOS later than iOS 5.0.
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5.2.2 MOQ for NetEco 1000S Devices
No. Model Description Quantity Remarks
OSS
1 iManager NetEco 1000S 1
Terminal
2 NATHLON21 Desktop PC-A6-5400B (3.6 GB
or higher)-4G-500 GB or
later-DVDRW-integrated
network card-Gigabit network
card-integrated audio
card-built-in sound box-21.5"
widescreen LCD or
higher-English version Windows 7 Professional 64-bit
1 Recommended
PC configurations
For details, see the iManager NetEco 1000S User Manual.
Smart PV Power Plant Solution
Descritpion 6 Reference
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
62
6 Reference
1. SUN2000 AC PDC User Manual
2. Always Available for Highest Yields - Huawei Smart PV Plant Solution
3. Smart PV Ground Power Plant Monitoring Solution Design Guide
4. FusionSolar Smart PV Management System Product Description
5. Ground Smart PV Power Plant Design Solution
6. FusionSolar V200R001C00 IES2.0 Smart PV Power Plant Management System Configuration Manual
7. FusionSolar V200R001C00 Management System IES2.0 Configuration List
8. SUN2000 (8KTL–28KTL) Product Description
9. SUN2000 Communications Cabinet (PID) User Manual
10. Huawei AR550-Series Industrial Switching Router Brochure
11. Huawei Smart PV Power Plant Broadband Wireless System Configuration Manual
12. iManager NetEco 1000S User Manual
13. SmartLogger1000 User Manual
14. Smart PV Power Plant Solution Product Catalog - Japanese Version