Stability analysis and improvement for LCL filter grid-connected inverter using inverter-side current feedback

被引：0
|
作者：
Zheng Z. [1 ]
Huang X. [1 ]
Yang M. [1 ]
Gao L. [1 ]
Li B. [1 ]
机构：
[1] School of Electrical Engineering & Automation, Henan Polytechnic University, Jiaozuo
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2019年 / 47卷 / 19期
基金：
中国国家自然科学基金;
关键词：
Grid-connected inverter; Inverter-side current feedback; SOGI; Stability; Weak grid;
D O I：
10.19783/j.cnki.pspc.181355
中图分类号：
学科分类号：
摘要：
The inverter-side current as a feedback parameter is a commonly used type of inverter which uses indirect current control, it has better stability than direct current control. However, in practical applications, the inverter usually works in the weak grid condition, the stability of grid-connected inverter will be greatly reduced. Taking the three-phase LCL inverter-side current feedback grid-connected inverter as an example, this paper analyzes the mechanism of the system stability degradation by using the frequency domain analysis method, and proposes to install a Second-Order Generalized Integrator (SOGI) in the grid voltage feedforward path. This strategy can attenuate the additional positive feedback associated with the impedance, which is introduced by the grid voltage proportional feedback, thereby improving system stability under weak grid. Finally, through the grid-connected inverter model and experiments, the effectiveness of the proposed control strategy is verified. © 2019, Power System Protection and Control Press. All right reserved.
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页码：31 / 37
页数：6
相关论文
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