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| Effect of Energy-Gaining Unit on Cascaded STATCOM and Balance Method During Pre-charging |
| Zhao Guoliang1,Li Weiguo1,Chen Weijiang2,Cai Bo3,Qiao Ermin3 |
1. North China Electric Power University Beijing 102206 China;
2. State Grid Corporation of China Beijing 100031 China;
3. Smart Grid Research Institute, SGC Beijing 102206 China |
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Abstract The paper focuses on the cascaded STATCOM (Static Synchronous Compensator) with energy gained from a transformer on the AC side. To study the DC voltage distribution of the converter and analyze the reason for its imbalance, an equivalent circuit that contains an energy-gaining unit is built for the converter during pre-charging. Based on it, a method for balancing DC voltages is proposed where the parameter differences in the energy-gaining unit are taken into account, which is also verified by LV physical experiment.
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Received: 05 September 2014
Published: 13 April 2015
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2015, Vol. 30 
