High frequency resonance characteristics analysis of voltage-source virtual synchronous generator and suppression strategy

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-01-17 DOI:10.1049/elp2.12413

Zhi Li, Mingbo Liu, Yu Gong, Xudong Li

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Abstract

The voltage-source virtual synchronous generator is a grid-forming type power electronic control technology and is able to support converters that have the ability of inertial, primary frequency and voltage regulation. Firstly, the authors build the small-signal model of the voltage-source virtual synchronous generator and conventional converters, compare and analyse the characteristics of the high-frequency resonance modes, the results show that the voltage-source virtual synchronous generator has almost the same high-frequency resonance characteristics as the conventional converter. Secondly, the different control parameters and power grid strength that affect the high-frequency resonance characteristic are analysed with eigenvalue, and the mechanism of voltage-source VSG that caused high-frequency resonance is derived. The leading factor that causes high-frequency resonance is power grid strengths, and the authors proposed introducing virtual impedance into the front-end channel of the current inner loop control strategy to suppress resonance for the voltage-source virtual synchronous generator based on the theoretical analysis with the small-signal model and eigenvalue analysis. In addition, the electromagnetic transient simulation model and RT-LAB controller-in-loop platform are built, and the simulation and experiment results indicate the effectiveness of the virtual impedance control strategy.

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电压源虚拟同步发电机的高频共振特性分析与抑制策略

电压源虚拟同步发电机是一种电网形成型电力电子控制技术，能够支持具有惯性、初级频率和电压调节能力的变流器。首先，作者建立了电压源虚拟同步发电机和传统变流器的小信号模型，对比分析了高频共振模式的特性，结果表明电压源虚拟同步发电机与传统变流器具有几乎相同的高频共振特性。其次，利用特征值分析了影响高频谐振特性的不同控制参数和电网强度，得出了电压源虚拟同步发电机引起高频谐振的机理。引起高频谐振的主要因素是电网强度，作者基于小信号模型和特征值分析的理论分析，提出了在电流内环控制策略的前端通道中引入虚拟阻抗来抑制电压源虚拟同步发电机的谐振。此外，还建立了电磁瞬态仿真模型和 RT-LAB 控制器在环平台，仿真和实验结果表明了虚拟阻抗控制策略的有效性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.

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