Analysis and Control of Low-frequency Oscillation Damping of Virtual Synchronous Generator Considering Influence of Voltage Loop

被引：0
|
作者：
Wang G. [1 ]
Fu L. [1 ]
Hu Q. [1 ]
Liu C. [1 ]
Ma Y. [1 ]
机构：
[1] National Key Laboratory of Science and Technology on Vessel Integrated Power System, Navy University of Engineering, Wuhan
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2022年 / 46卷 / 14期
基金：
中国国家自然科学基金;
关键词：
damping torque method; integration of renewable energy; low-frequency oscillation; multi-time-scale; negative damping effect; phase compensation; virtual synchronous generator (VSG); voltage loop;
D O I：
10.7500/AEPS20211112003
中图分类号：
学科分类号：
摘要：
The virtual synchronous generator (VSG) simulates the operation characteristics of the synchronous generator through the multi-layer control. Its dynamics have multi-time-scale characteristics, and there is a broadband oscillation mode in the grid-connected system. This paper focuses on the low-frequency oscillation mode. Based on the multi-time-scale characteristic analysis, this paper establishes a stability analysis model similar to the Heffron-Phillips model considering the influence of the dq-axis voltage loop in the adjacent time scale. Then, based on the traditional research idea of low-frequency oscillation in the power system, the damping torque method is used to reveal the damping characteristics of virtual rotor motion. It is found that the damping of VSG can be divided into two parts: the inherent damping of virtual rotor motion and the additional damping provided by the equivalent electromagnetic torque. The additional damping is negative and is deeply affected by the dynamics of the voltage loop. When the additional damping is greater than the inherent damping, the low-frequency oscillation mode will be unstable due to the insufficient damping. Based on the analysis of damping characteristics, a phase compensation method of voltage loop is proposed. The angle between equivalent electromagnetic torque and the negative half axis of the damping component is increased to weaken the negative damping effect introduced by the voltage loop. Finally, the correctness of the theoretical analysis and the effectiveness of the improved control are verified by simulation. © 2022 Automation of Electric Power Systems Press. All rights reserved.
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页码：177 / 184
页数：7
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