battery storage aided grid connection pv power plants · pdf file3 attributes of grid...
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Battery Storage Aided Grid Connection PV Power Plants
2
Typical Structure of a Grid Connected Large PV Power Plant
Battery Storage A
ided Grid C
onnection of PV Power Plants
BT
Grid
AC Transmission Line
=~
=~
=~
=~
AC Transmission Cables
10 kV
110 kV
BT: Step-Up Transformer
80 MW
Plot 1: 80 x PV.250Plot 2: 80 x PV.250Plot 3: 80 x PV.250Plot 4: 40 x PV.500
L
PCC
3
Attributes of Grid Connected Large PV Power Plants
Battery Storage A
ided Grid C
onnection of PV Power Plants
• Generation profile differs from load profile
Load shifting required
• Specific generation maximum at noon
Peak shaving required
• Rolling clouds lead to sudden voltage drop and rise
Peak shaving and injection of reactive power required
• DSO / TSO desires / requires conventional power plant properties
LV fault ride through capability
Fault current capability
Participation in primary control (provision of positive and negative active power)
Provision of positive or negative reactive power
Requires Electrical Energy Storage (EES)
Requires EES
Requires EES
Can be improved by EES
Requires EES
Can be improved by EES
Strong Demand for a Short Term Electrical Energy Storage System
4
Battery Storage A
ided Grid C
onnection of PV Power Plants
BT
Grid
AC Transmission Line
=~
=~
=~
=~
AC Transmission Cables
10 kV
110 kV
BT: Step-Up Transformer
L
PCC
=~
Battery Energy Storage System BESS
Option: Battery Storage Aided Grid Connection
5
Option: Battery Storage Aided Grid Connection
Battery Storage A
ided Grid C
onnection of PV Power Plants
=~
=~
SC.500
SC.500
SC.LogSC.Ctrl
Power-Plant.Ctrl
Grid
10 … 30 kV
PCC
Grid
DSOModbus et al.
IEC 61850
TKS-SC 1000
=~
=~
PV.500
PV.500
PV.LogPV.Ctrl
TKS-C 1000
Battery Container
BMS
PV Power Plant
Connection to 110 kV or other voltage possible
(add. Transformer req.)
6
Battery Energy Storage System BESS – Detailed Prototype Layout
Battery Storage A
ided Grid C
onnection of PV Power Plants
7
BESS – Prototype Layout of Storage Converter
Battery Storage A
ided Grid C
onnection of PV Power Plants
TKS-SC.1000
Inverter Cabinet
Inverter Cabinet + AC / DC Cabinet
8
BESS – Prototype Layout of Battery Container
Battery Storage A
ided Grid C
onnection of PV Power Plants
Picture Credit: Hoppecke
Picture Credit: Hoppecke
Picture Credit: Hoppecke
Battery Container (Example)
Positioning and Connection of Batteries
Battery Container (Example)
9
Battery Technology
Lead – Acid (Pb) Batteries
• Electrodes: Tubular lead plates
• Electrolyte: Diluted sulphuric acid
• Mature technology, operated at room temperature
• High degree of standardization
• Many suppliers on the market, globally available
• Nominal cell voltage: 2 V
• Energy density 25 Wh/kg (gravimetric) or 75 Wh/l (volumetric)
• Efficiency 80 – 90 %
• Lifetime 6 – 12 years resp. 2000 – 7000 cycles
• Invest: 100 – 25 EUR/kWh, Renting / Leasing possible => 0 EUR/kWh
Picture Credit: Hoppecke
Battery Storage A
ided Grid C
onnection of PV Power Plants
10
Battery Technology
Battery Storage A
ided Grid C
onnection of PV Power Plants
11
Control and Communication Systems
Battery Storage A
ided Grid C
onnection of PV Power Plants
=~
=~
SC.500
SC.500
SC.LogSC.Ctrl
Power-Plant.Ctrl
Grid
10 … 30 kV
PCC
Grid
DSOModbus et al.
IEC 61850
TKS-SC 1000
=~
=~
PV.500
PV.500
PV.LogPV.Ctrl
TKS-C 1000
Battery Container
BMS
PV Power Plant
Connection to 110 kV or other voltage possible
(add. Transformer req.)
12
Control and Communication Systems
Battery Storage A
ided Grid C
onnection of PV Power Plants
SC. Control
SC. Log
BMS
BESS Control / Power Plant Control
EthernetPower Utility Bus