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电网技术  2014 

基于等效参考电流控制的低压微电网控制策略

DOI: 10.13335/j.1000-3673.pst.2014.06.017, PP. 1529-1535

Keywords: 分布式电源,低压微电网,孤岛模式,并网模式,同步并网控制

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Abstract:

在PQ控制和V/f下垂控制的基础上提出了微电网2种运行模式下均适用的等效参考电流控制法。对于电压幅值和频率,将其参考值与各自实际运行值的偏差分别引入到参考电流的dq轴分量中,通过对引入偏差的控制使分布式电源在微电网2种运行模式下具有相应的运行特性。该方法避免控制方法因运行模式变化而切换,确保了运行模式间的平滑转换;还能有效改善孤岛运行时电压和频率的动态调节效果,实现并网运行时的直接功率控制。同时,针对该控制方法设计了同步并网控制器,实现了微电网的平滑并网。仿真和实验结果证明了所提控制策略的可行性。

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