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在级联H桥静止同步补偿器(STATCOM)研究实验过程中,发现各相阀组间存在直流侧电压不平衡,且阀组间直流侧电压不平衡度随着补偿电流的增大有增大的趋势。阀组间的直流侧电压平衡,对于级联H桥STATCOM的安全运行以及性能均具有重要意义,但尚未有阀组间直流侧电压不平衡的原因分析。文中通过对系统电压的正负序分解,分析了级联H桥拓扑结构中负序电压与正序电流的相互作用对有功功率的影响,解释了级联STATCOM阀组间直流侧电压不平衡的物理原因,对阀组不平衡进行了定量分析。仿真和实验结果证实了该方法的正确性,从而为解决阀组间直流侧电压不平衡提供了合理的依据。
In the research of cascaded H-bridge static synchronous compensator (STATCOM), it is found that DC voltage unbalance exists among all the valve groups, and the voltage unbalance between the valve banks increases with the increase of the compensation current the trend of. The DC voltage balance between valve banks is of great significance for the safe operation and performance of the cascaded H-bridge STATCOM. However, the reason for the unbalance of the DC voltage between the valve banks has not yet been analyzed. In this paper, the positive and negative sequence decomposition of system voltage is used to analyze the influence of the interaction between negative sequence voltage and positive sequence current on the active power in the cascaded H-bridge topology. The unbalanced DC voltage between cascaded STATCOM valves is explained Physical reasons, a quantitative analysis of the valve imbalance. The simulation and experimental results confirm the correctness of the method, which provides a reasonable basis for solving the voltage unbalance between the valve banks.