Analysis and Design of Grid-Connected Inverter Impedance Remodeling with Fixed Stability Margin in Weak Grid

被引：0
|
作者：
Tu C. [1 ]
Gao J. [1 ]
Zhao J. [2 ]
Zhang Y. [2 ]
Guo Q. [1 ]
机构：
[1] National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Changsha
[2] School of Electrical Engineering, Shanghai University of Electric Power, Shanghai
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2020年 / 35卷 / 06期
关键词：
Grid-connected inverter; Impedance criterion; Impedance remodeling; LCL; Stability margin; Weak grid;
D O I：
10.19595/j.cnki.1000-6753.tces.190027
中图分类号：
学科分类号：
摘要：
The stability control of grid-connected inverter in weak grid is studied. Based on the reconstructed impedance-based stability criterion, the current double closed-loop control of three-phase LCL grid-connected inverter is used as a model to establish a Norton equivalent series and parallel impedance mathematical model for the inverter grid-connected system. By analyzing the characteristics of inverter equivalent output impedance, the parallel equivalent output impedance of inverter is selected to be reconstructed. The impedance reconstruction control technology includes three units: grid impedance detection, phase margin compensation and amplitude correction. The reconstructed equivalent impedance model can always maintain a constant stability margin for the inverter grid-connected system when the grid impedance varies widely, meanwhile, considering the detection error of the grid impedance, the system can still maintain good steady-state and dynamic performance. Simulation and experimental measurements verify the analysis. © 2020, Electrical Technology Press Co. Ltd. All right reserved.
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页码：1327 / 1335
页数：8
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