Optimal Design of Virtual Synchronous Generator Virtual Impedance Considering Frequency Coupling

被引：0
|
作者：
Du Y. [1 ,2 ]
Zhu K. [1 ,2 ]
Yang X. [1 ,2 ]
Zhao H. [1 ,2 ]
Gao C. [1 ,2 ]
Lin Z. [3 ]
机构：
[1] School of Electrical Engineering and Automation, Hefei University of Technology, Hefei
[2] Research Center for Photovoltaic Systems Engineering, Ministry of Education, Hefei University of Technology, Hefei
[3] School of Economics and Management, Tsinghua University, Beijing
来源：
Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 12期
关键词：
frequency coupling effect; parameter design; sequence impedance model; stability margin; virtual impedance simplifies design; virtual synchronous generator;
D O I：
10.13336/j.1003-6520.hve.20220650
中图分类号：
学科分类号：
摘要：
The frequency coupling phenomenon of the virtual synchronous generator (VSG) will reduce the stability margin of the system and cause the oscillation instability of the VSG. The article establishes a VSG sequence impedance model, and analyzes the influence mechanism of frequency coupling characteristics on the stability of VSG. Considering that the sequence impedance of the VSG and the grid impedance are coupled with each other after the frequency coupling characteristics are added, a simplified design scheme of virtual impedance is proposed; the grid-source subsystem is re-segmented, the virtual impedance is converted to the grid side, and the grid-connected stability is used at the same time. And the power output capability gives the virtual impedance value range for the constraint. The experimental results on the StarSim semi-physical platform verify the feasibility and correctness of the simplified virtual impedance scheme and parameter design method, and show that the method can enhance the stability margin of the VSG under different grid impedances and ensure that the system has sufficient power output capability. © 2022 Science Press. All rights reserved.
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页码：5057 / 5067
页数：10
相关论文
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