Studies on the clustered voltage balancing mechanism for cascaded H-bridge STATCOM
Studies on the clustered voltage balancing mechanism for cascaded H-bridge STATCOM
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DOI：
10.1109/apec.2016.7468171
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
Daorong Lu;Haibing Hu;Y. Xing;Xiaobin He;K. Sun;Jianhui Yao
中科院分区：
文献类型：
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作者：
Daorong Lu;Haibing Hu;Y. Xing;Xiaobin He;K. Sun;Jianhui Yao
为了研究级联H桥STATCOM的分簇电压平衡机制，在dq坐标系下对电网有功功率进行正、负序分解。在详细分析的基础上，由负序电压和电流产生的部分集群有功功率，称为负序集群有功功率（NCAP），可以重新分配三个集群之间的有功功率，这意味着它可以用来平衡三个集群的电压。建立了NCAP与控制变量占空比之间的关系。该关系表明，在不进行分簇平衡控制的情况下，三个分簇电压均能收敛到稳定电压，表明级联H桥STATCOM具有分簇电压自平衡特性。最后提出了一种平衡控制方法来调节NCAP。实验结果验证了该控制方法的有效性。
To study the clustered voltage balancing mechanism for cascaded H-bridge STATCOM, the active power from the grid is decomposed of by using positive and negative sequences in dq frame. Based on the detailed analysis, portion of clustered active power generated by negative-sequence voltages and currents, referred as negative-sequence clustered active power (NCAP), can redistribute the active power among three clusters, which implies it can be utilized to balance the three clustered voltages. Then, the relationship between NCAP and control variables-duty cycle is built. The relationship reveals that three clustered voltages are capable of converging to stable voltages without any clustered balancing control, indicating the cascaded H-bridge STATCOM having the clustered voltage self-balancing feature. Finally a balancing control method is proposed to regulate NCAP. The effectiveness of the proposed control method is verified by the experiments.