Transient synchronization stability analysis of a virtual synchronous machine isolated island parallel system

被引：0
|
作者：
Xu Y. [1 ]
Zhu L. [2 ,3 ]
Lü Z. [1 ]
Wang Q. [1 ]
机构：
[1] College of Electrical and Automation Engineering, Nanjing Normal University, Nanjing
[2] NARI Group Corporation, State Grid Electric Power Research Institute, Nanjing
[3] Northeast Electric Power University, Jilin
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2023年 / 51卷 / 15期
基金：
中国国家自然科学基金;
关键词：
critical clearing angle (CCA); critical clearing time (CCT); equal area criterion (EAC); island parallel system; transient synchronization stability; virtual synchronous generator;
D O I：
10.19783/j.cnki.pspc.221616
中图分类号：
学科分类号：
摘要：
There is a problem that the transient instability mechanism of an isolated parallel system of a virtual synchronous machine is unclear and the traditional equal area rule is conservative in quantitative calculation. Thus this paper proposes an improved equal area rule considering damping scaling. This method uses the equal area rule to scale the unbalanced power offset by the damping term into an integrable term of opposite angle. The influence of the control parameters of the virtual synchronous machine on the critical clearing angle (CCA) and critical clearing time (CCT) of the parallel power supply system can be calculated quantitatively. The results show that the virtual damping of the virtual synchronous machine has a great influence on transient stability. The virtual damping is positively correlated with the CCA and the CCT; also the virtual inertia is negatively correlated with the CCA and positively correlated with the CCT, and the virtual damping should be given priority when the system capacity is sufficient. The research idea of the transient synchronization stability of a multi-machine parallel system with VSG overcurrent protection is preliminarily explored, and the applicability of the proposed method in multi-machine systems is analyzed. Finally, based on the PSCAD/EMTDC simulation platform, the correctness of the theoretical analysis and the proposed method is verified. © 2023 Power System Protection and Control Press. All rights reserved.
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页码：1 / 11
页数：10
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