Capacitor voltage feedforward control strategy of grid-connected inverter in weak grid

被引：0
|
作者：
Yang M. [1 ]
Bao J. [1 ]
Sun Y. [1 ]
Wei Y. [1 ]
机构：
[1] School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2021年 / 42卷 / 07期
关键词：
Active damping; Feedforward compensation; Grid impedance; LCL grid-connected inverter; Stability margin;
D O I：
10.19912/j.0254-0096.tynxb.2019-1382
中图分类号：
学科分类号：
摘要：
A mathematical model of LCL grid-connected inverter system is established to solve the problems of low stability margin and excessive harmonic when LCL grid-connected inverter is connected to a weak grid. Firstly,the influence of wide range of power grid impedance on system stability is analyzed. A capacitor voltage feedforward control strategy based on inverter side current feedback control system is constructed. Secondly, based on the principle of minimizing the number of sensors, the parameters of the capacitor voltage active damping are designed and the filter is superimposed on the feedforward compensation link to optimize the design, so that the grid-connected inverter always has sufficient stability margin in weak grid. Finally, a grid-connected inverter simulation model and prototype are built to verify the effectiveness, and the feasibility of the proposed method are verified. © 2021, Solar Energy Periodical Office Co., Ltd. All right reserved.
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页码：94 / 102
页数：8
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