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电网技术  2011 

抑制多台分布式发电单元自治微网环流的主从控制策略

, PP. 143-148

Keywords: 自治微网,分布式发电,逆变器,环流,主从控制

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Abstract:

为提高自治微网系统的容量和可靠性,多台分布式发电(distributedgeneration,DG)单元多并联运行。各DG输出电压幅值、频率、相位等微小的差异会在各DG间产生较大的环流,使其中的逆变器性能变差或损坏,因此必须对环流加以控制。分析了自治微网中多台DG并联运行时环流产生的原理,提出了用以抑制环流的等电压、等电流、等功率以及混合式4种主从控制策略。根据各DG采用的LCL接口电路,给出了相应的嵌套式逆变器控制结构。以含3台并联运行DG的自治微网为算例,用Matlab/Simulink进行仿真,分析了不同负载情况下的环流抑制效果,验证了上述策略的正确性和可行性。

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