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2014 年 6 月 电 工 技 术 学 报 Vol.29 No. 6
第 29 卷第 6 期 TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Jun. 2014
STATCOM
210096
STATCOM 3
STATCOM
PCC STATCOM
TM712
Influence of Grid Voltage Unbalance on STATCOM
and the Countermeasure
Yi Guiping Hu Renjie Jiang Wei Huang Huichun
(Southeast University Nanjing 210096 China )
Abstract The unbalanced grid voltage has a serious influence on the output performance and
safe operation of the static synchronous compensator(STATCOM), DC side capacitor produces double
frequency voltage fluctuation, AC side output current contains negative sequence and third-order
harmonic, and converter may be overcurrent caused by negative sequence current and third-order
harmonic current. To solve this problem, the influence of unbalanced voltage to STATCOM is analysed
on the basis of switch function method, a new dual-loop control strategy is proposed to suppress the
influence and an improved switching function modulation is proposed to suppress the third-order
harmonic current in order to make STATCOM safe in this paper. The STATCOM is operated as a current
source controlled by the voltage at the point of common coupling(PCC) to suppress the unbalanced
system voltage. The compensation effect is related to control parameters closely, and reasonable
selection of PCC voltage phase angle can guarantee the minimum compensation capacity u
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