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电网技术  2014 

低压微电网多逆变器并联下的电压不平衡补偿方法

DOI: 10.13335/j.1000-3673.pst.2014.02.022, PP. 412-418

Keywords: 分布式电源,微电网,α,β,静止坐标系,下垂控制,电压不平衡

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Abstract:

随着微电网规模的扩大,负载接入不对称日趋严重,导致微电网电压出现不平衡。为此,提出了αβ坐标系下的低压微电网多逆变器并联电压不平衡补偿方法。该方法包括不平衡补偿环、下垂控制环及电压电流环3个部分。在传统功率下垂控制基础上,通过检测三相负序电压和电流,引入功率下垂控制基础上,通过检测三相负序电压和电流,引入负序无功电导不平衡下垂控制环,合成并修正指令电流参考值。电压电流控制环采用准比例谐振(proportional-resonant,PR)控制实现电压的无静差控制,采用无差拍控制实现内环电流的精准控制。仿真和实验结果表明了所提的控制方法的有效性。

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