Analysis of Influence of Control Delay on Stability of Virtual Synchronous Machine

被引：0
|
作者：
Tu C. [1 ]
Xie W. [1 ]
Xiao F. [1 ]
Lan Z. [2 ]
Zhou D. [3 ]
机构：
[1] National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Changsha, 410082, Hunan Province
[2] College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou, 412007, Hunan Province
[3] State Grid Jiangsu Electric Power Research Institute, Nanjing, 211113, Jiangsu Province
来源：
Dianwang Jishu/Power System Technology | 2020年 / 44卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Digital control delay; Global stability; State space; Virtual synchronous generator(VSG);
D O I：
10.13335/j.1000-3673.pst.2019.1274
中图分类号：
学科分类号：
摘要：
Virtual synchronous generator (VSG) control technology, making grid-connected inverters simulate operation of traditional synchronous generators, has broad application prospects. Relying on digital control technology, VSG control has the inherent control delay problem of digital control, restricting the response characteristics and control accuracy of the system and affecting system stability. Mostof existing studies are limited to analyze the impact of digital control delay on only one part of the control system. In this paper, a state space model of high-order small signal is established for VSG system considering control delay. Based on the model, the root trajectory of the system characteristics is obtained, stability of the inverter under different delays is analyzed, and then the critical delay time of the system stability is given. Simulation and experimental results verify correctness of the theoretical analysis in this paper. The method presented in this paper provides theoretical reference for parameter design of inverter system. © 2020, Power System Technology Press. All right reserved.
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页码：3021 / 3028
页数：7
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