series hybrid converter (shc) system
TRANSCRIPT
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Series Hybrid Converter (SHC)
HVDC System
Adlan B Pradana
2010EEP3791
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SCC (Self Commutated Converter vs. LCC
(Line Commutated Converter)
SCC
Immune to the strength ofnetwork (+)
Controllable power factor (+)
Can be used in a voltagesupport role (+)
Permit the elimination oflower order harmonic filters
(+) Excessive cost (-)
Smaller ratings compare toLCC (-)
LCC
Extensively used (+)
Require reactive power
source (-)
Difficult to operate in weak
system (-)
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SCC + LCC = Hybrid HVDC System
There are 2 arrangements :
Back 2 back (B2B)
Series Hybrid Converter (SHC)
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Back to Back (B2B)
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Series Hybrid Converter (SHC)
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B2B vs. SHC
Hybrid HVDC
SCC only in one side, so its
advantages also only in one
side (inverter/rectifier)
Only for a new built system
SHC
SCC can be installed on both
side, so its advantages also
for both side (inverter &rectifier)
Can be used both for a new
built system or add on
(upgrade)
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SHC
Combination of LCC and VSC in one bus
LCC provides part of the required real power, VSCadd the remainder
VSC controls reactive power necessary for theLCC
2 types :
VSC as add on of existing LCC HVD VSC + LCC for a new system
SVSC = [PVSC2+QVSC
2] 1/2
= [(Pnom PLCC )2 + (0.6 *PLCC Qfilt )
2] 1/2
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Control
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Control (LCC)
Current order is generated using external PIpower regulator
Angle orders is based on :
Terminal power mismatch Current in HVDC circuit
Measured extinction angle at rectifier and
inverter
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Control (SCC)
VSC Control block P & Q orders are derived from external regulators for
dc & ac side voltages respectively
Magnitude and angle driving signals are issued based
on : Capacitor voltage (Vdc) mismatch generates P
Terminal voltage (Et) mismatch generates Q
Terminals d & q axis components of voltage (Et,Eq)
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Start Up Comparison
LCC Only SHC
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Step Response Comparison
LCC Only SHC
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Conclusion
SHC system combining advantages of LCC andVSC
SHC can be applied both as add on or as a new
system Response of SHC is better than LCC alone :
Excellent start up
Terminal voltage support
Superior step response Acceptable fault recoveries
The disadvantages is more complexity in control
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References
B. Qahraman (IEEE student member), A. Gole (IEEEmember), A VSC Based Series Hybrid Converter forHVDC Transmission, Canadian Conference Electricaland Computer Engineering on 1-4 May 2005
Li Guangkai, Li Gengyin (Member IEEE), Liang Haifeng,Zhao Chengyong, Yin Ming Research on HybridHVDC, Power System Technology - POWERCON 2004
Y Iwata, S Tanaka, K Sakamoto H Konishi, H Kawazoe,Simulation Study of a Hybrid HVDC System Composedof a Self-commutated Converter and a Line-commutated Converter
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Thank You