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采用势函数法的微电网无功控制策略

, PP. 44-51

Keywords: 微电网,分布式电源,下垂控制,无功出力分配,势函数,二级控制

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Abstract:

由于受到微电网线路阻抗特性等因素的影响,传统的下垂控制存在无功出力难以按照下垂增益分配的问题。分析分布式电源无功出力与空载输出电压之间的关系,并在此基础上提出基于二级控制的微电网无功控制策略。该方案利用无功出力分配关系和空载输出电压的偏离程度构造势函数。微电网中央控制器根据势函数对各分布式电源的空载输出电压进行集中调整,达到改善无功出力分配的目的。仿真结果表明该方案具有良好的动态响应特性和稳态性能。此外,用正则环流无功概念来考察不同负荷水平对分布式电源无功出力分配的影响,进一步验证了所提方案的有效性。

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