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| Analysis and Suppression of Influence on D-STATCOM Under Unbalanced Voltage of Power System |
| Tu Chunming, Li Hui, Tang Jie, Luo An |
| Hunan University Changsha 410082 China |
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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.
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Received: 11 December 2007
Published: 17 February 2014
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2009, Vol. 24 
