两级式单相逆变输入端纹波电流双反馈抑制

Input Ripple Current Active Mitigating for Two-Stage Single-Phase Inverter Based on Double Channel Current Feedback

在两级式单相逆变系统中,逆变器的输入端电流含有大量低频纹波。本文对两级式单相逆变系统中能量流动、纹波功率以及输入端纹波电流的产生机理进行了分析。基于Boost电路的小信号模型和纹波电流的等效电路模型,提出一种基于电流双反馈通道的输入端纹波电流抑制方法。此控制策略在基于DSP的先进数字控制平台上进行了实验,实验结果表明了该控制策略的有效性和合理性。

In the two-stage single-phase renewable energy inverter system, the current drawn from renewable energy sources tends to be pulsated and contains harmful low frequency ripple components. This paper analyses the power flow in two stage single-phase power system and the mechanism of ripple power and ripple current in the input. Based on Boost DC-DC convertor small signal mode, the equivalent circuit model of ripple current is studied. A novel active input ripple current mitigating technique based on double channel current feedback is proposed by modifying the conventional voltage and current double-loop control method. Finally, a DSP-base experimental platform is built up with the proposed control strategy, and the results are provided to verify its effectiveness.