Abstract：Under unbalanced voltage of power system, the influence on voltage output performance of distribution network static synchronous compensator (D-STATCOM) is analyzed. Two times frequency wave occurs in voltage of capacitor at DC side of D-STATCOM under unbalanced voltage, which result in negative sequence and 3 times harmonics in AC voltage and converter may be overcurrent caused by negative sequence current and 3 times harmonic current. According the problem above, improved switching function modulation is proposed to improve voltage output performance of D-STATCOM and suppress 3 times harmonic current. An unbalanced control strategy of feed-forward control for negative sequence voltage is also carried out to suppress converter overcurrent caused by negative voltage in order to make D-STATCOM safe. Simulation results show the good performance.
涂春鸣, 李慧, 唐杰, 罗安. 电网电压不对称对D-STATCOM的影响分析及抑制[J]. 电工技术学报, 2009, 24(10): 114-121.
Tu Chunming, Li Hui, Tang Jie, Luo An. Analysis and Suppression of Influence on D-STATCOM Under Unbalanced Voltage of Power System. Transactions of China Electrotechnical Society, 2009, 24(10): 114-121.
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2009, Vol. 24 
