Control Method of LCL Inverter Based on Improved Weighted Average Current Feedback

WANG Ying; SUN Jianfeng; XIAO Xianyong; YANG Minhui

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Control Method of LCL Inverter Based on Improved Weighted Average Current Feedback

更新时间：2025-12-08

- Control Method of LCL Inverter Based on Improved Weighted Average Current Feedback
- Vol. 47, Issue 8, Pages: 2678-2687(2021)
- 作者机构：
  
  四川大学电气工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 August 2021，
  
  Published：2021
- 稿件说明：
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WANG Ying, SUN Jianfeng, XIAO Xianyong, et al. Control Method of LCL Inverter Based on Improved Weighted Average Current Feedback[J]. 2021, 47(8): 2678-2687.
DOI：

WANG Ying, SUN Jianfeng, XIAO Xianyong, et al. Control Method of LCL Inverter Based on Improved Weighted Average Current Feedback[J]. 2021, 47(8): 2678-2687. DOI：

摘要

为解决加权平均电流反馈(weighted average current feedback

WACC)控制下

并网电流存在谐振且开环增益中存在反谐振现象的问题

提出了一种改进的WACC方法。首先

引入电容电流反馈控制

以提升并网电流质量;然后

通过引入补偿环节

保证控制系统的降阶特性

从而有效抑制计及数字控制延时情况下控制系统中出现的反谐振和并网电流谐振。研究结果表明

所提方法可有效地将控制系统的幅值裕度从2.2 d B提升至8 d B

增强了系统鲁棒性

将并网电流谐波畸变率从5.46%降低到0.71%

改善了并网电流质量。所提方法可为实际工程中的并网逆变器控制提供参考。

Abstract

In order to solve the problem of resonance in grid connected current and anti-resonance in open-loop gain under the control of weighted average current feedback（WACC）

an improved WACC method is proposed. Firstly

the capacitor current feedback control is introduced to improve the quality of grid connected current; then

the compensation link is introduced to ensure the reduced order characteristics of the control system

so as to effectively suppress the anti-resonance and grid current resonance in the control system considering the digital control delay. The results show that the proposed method can be adopted to effectively improve the amplitude margin of the control system from 2.2 dB to 8 dB

enhance the robustness of the system

reduce the harmonic distortion rate of grid connected current from 5.46% to 0.71%

and improve the quality of grid connected current. The proposed method can provide reference for the control of grid connected inverter in practical engineering.

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