Resonance suppression and quality improvement control strategy for a three-phase grid-connected voltage-source inverter under weak grid conditions

Frontiers in Energy Research

Energy Research

Zhaoyun Zhang¹  Caomao Zhong¹  Zhi Zhang¹  Yiyun Li² 

[1] Department of Electrical Engineering and Automation, Dongguan University of Technology, Dongguan, China;Department of Electrical Engineering and Automation, Dongguan University of Technology, Dongguan, China;College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen, China;

关键词: three-phase voltage-source grid-connected inverter;    inverter resonance suppression;    harmonic virtual impedance;    grid-connected current quality;    root locus;   

DOI  :  10.3389/fenrg.2023.1231992

 received in 2023-05-31, accepted in 2023-08-03,  发布年份 2023

来源: Frontiers

【 摘 要 】

The three-phase voltage-source grid-connected inverters suffer from grid-connected current quality problems due to system resonance caused by the under-damping characteristics of the filter and grid impedance, on the one hand, and the grid-connected current distortion caused by the high content of low harmonics in the grid voltage, on the other hand. To resolve this problem, a current quality improvement control strategy, combining capacitor-current feedforward active damping and harmonic virtual impedance reshaping, is proposed by analyzing the mechanisms of system resonance and grid-connected current distortion. In addition, the proposed control strategy allows determining the virtual impedance parameters by using the root locus method, so as to achieve the purpose of improving the output grid-connected current quality of the three-phase voltage-source grid-connected inverter under weak grid conditions. Finally, the correctness and effectiveness of the proposed control strategy are verified by simulation and experiment.

【 授权许可】

Unknown   
Copyright © 2023 Zhang, Li, Zhong and Zhang.