并网逆变器谐波电流抑制研究中的准无穷大输出阻抗概念与应用

摘要

为抑制并网逆变器入网电流的谐波成分，提出并网逆变器输出阻抗准无穷大的思路。基于该思路，从并网系统诺顿等效电路的输出阻抗角度入手，详尽分析电网电压比例前馈控制、电网电压优化前馈控制和多谐振控制对输出阻抗影响的基础上，提出一种基于优化前馈与多谐振控制组合的控制策略。实验结果证明了所提组合谐波抑制策略的有效性。%To reject low-frequency harmonic currents of grid-connected inverter, the idea that quasi-infinite output impedance of the grid-connected inverter is proposed. From Norton equivalent circuit model, a combined scheme for harmonic suppression is proposed based on detailed performance analysis of partial grid voltage feed-forward, full grid voltage feed-forward and multi-resonant control schemes in this paper. Finally, experimental results are presented to demonstrate the effectiveness of the proposed multi-resonant control schemes.