training presentation sfc_v2
TRANSCRIPT
Power Service GmbH Satic frequency convertersPage 1 19.07.2002
Static Frequency Converters
Rolf Kramer SER/EIG
Power Service GmbH Satic frequency convertersPage 2 19.07.2002
Basics Static Frequency Converter
BASIC
Principle of operation
Static Frequency Converter
(SFC / LCI.ST)
Date: 19.07.2002
Power Service GmbH Satic frequency convertersPage 3 19.07.2002
AC
AC
SMGT
ie
Tr
1. LCI DRIVE SYSTEMS Today
Frequency starting with Static Frequency Converter (SFC)
Other terms are:
LCI = Load Commutated Inverter
SSD = Static Starting Device
U
Power Service GmbH Satic frequency convertersPage 4 19.07.2002
1. LCI DRIVE SYSTEMS Basic circuit
Control and protection system
Starting excitation system
Rectifier SRN Inverter SRM
DC link reactor
Power supply side
Static frequency converterStatic starting system
id
ie
SM
Isolating transformer
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1. LCI STARTING SYSTEMS
6/6-pulse
12/12-pulse
6/6-pulse withstep-up trafo
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1. LCI DRIVE/STARTING SYSTEMS
Standard converter configurations and options.
Converter for Drives( DR )
Soft Starter( SO )
Gas Turbine Starter ( ST )
Configuration6/6-pulse
12/12-pulse2x6/6-pulse
6/6-pulse12/12-pulse 6/6-pulse
ThyristorCooling
Block integra-ted Excitation
AC-Controlleror
6-pulse Rectifier
6-pulse Rectifieror none 6-pulse Rectifier
AirWater
AirWater Air
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6. Run up to synchronous speed
L1
L2
L3
e
L1
L3
i
Id
e Magnetic flux produced by rotor windingsi Magnetic flux produced by stator windings
Power Service GmbH Satic frequency convertersPage 8 19.07.2002
L1
L2
L3
6. Run up to synchronous speed
L1
L3
ieeeeeeeeee
60°Id
e Magnetic flux produced by rotor windingsi Magnetic flux produced by stator windings
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L1
L2
L3
6. Run up to synchronous speed
Id = 0
e
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L1
L2
L3
6. Run up to synchronous speed
L2
L3
i
e eee
ee
60°
Id
e Magnetic flux produced by rotor windingsi Magnetic flux produced by stator windings
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L1
L2
L3
6. Run up to synchronous speed
Id = 0
e
Power Service GmbH Satic frequency convertersPage 12 19.07.2002
L1
L2
L3
e
6. Run up to synchronous speed
L2
L1
i
Id
e e ee60°
Repeat startup
e Magnetic flux produced by rotor windingsi Magnetic flux produced by stator windings
Power Service GmbH Satic frequency convertersPage 13 19.07.2002
6. Run up to synchronous speed
0 naSpeed
SM
idMachine
converter
SM
idMachine
converter
Fluxcalculation
t
160° (i.e. 20°)MC
t
id
uuiut
tid
=180° (i.e. = 0°)MC
uu iu
Pulse mode operation Machine commutated operation
Control from flux calculation Control from machine voltages
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6. SFC start to turn mode (70 rpm) pulse mode
DC Link current -Idx: UAC 326-A19 -5V= 1280 VDC
Excitation current Iex: UAC 326-AIC 5V= 350 ADC
Speed nx: UAC 326-AO7 10V= 3000rpm
Machine voltage Urt comp: SA9923-X12 7V= 1800 VAC
Power Service GmbH Satic frequency convertersPage 15 19.07.2002
6. Machine Voltage at 1165 rpm machine commutation
Machine Voltage: URT: SA9923-X4 7V=1800 VAC
Machine volatage: URtcomp: SA9923-X127V=1800 VAC
Power Service GmbH Satic frequency convertersPage 16 19.07.2002
Machine commutated mode
Pulsing mode
Machine Torque produced by SSD
Line Voltage, Line Frequency
Machine Current, DC-Current
Machine Voltage, Machine Power
Breaking Torque produced byCompressor
Ignition of theGas Turbine
Excitation Current
Field-weakening mode
nRated Speed
8. Start sequence
Self sustaining speed