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电网技术  2013 

光伏并网逆变器输出电压直流分量的瞬时补偿策略

, PP. 3080-3085

Keywords: 并网逆变器,输出电压,直流分量,重复控制,PI控制

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Abstract:

光伏并网逆变器输出电压中的直流分量会给逆变器、电网以及负载带来危害,为此,提出了一种基于重复控制思想的光伏并网逆变器输出电压直流分量的瞬时补偿策略。分析了光伏并网逆变器输出电压直流分量的产生原因。引入重复控制思想,以载波周期为单位检测光伏并网逆变器输出电压直流分量,并将每个载波周期检测得到的输出电压直流分量结果之和作为反馈与输出电压PI控制环一起调整正弦脉冲宽度调制(sinusoidalpulsewidthmodulation,SPWM)占空比,实现对光伏并网逆变器输出电压直流分量的补偿。实验结果验证了该策略的可行性。

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