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电网电压不平衡对STATCOM的影响及抑制

, PP. 238-247

Keywords: 电网电压不平衡,静止同步补偿器,开关函数法,双环控制策略,电压控制电流源

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Abstract:

采用开关函数法分析了不平衡电压对装置的影响,提出一种新的双环控制策略,抑制了负序电压对STATCOM的影响,对开关函数进行了改进,抑制了3次谐波电流,保障了装置的安全可靠运行。通过将STATCOM控制为受电压控制的电流源来补偿系统电压的不平衡,其补偿效果和控制参数紧密相关,合理选择公共连接点(PCC)处电压的相角可保证在STATCOM补偿性能最优的情况下补偿容量最小。仿真和实验结果验证了本文的控制策略及理论分析的正确性和有效性。

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