Journal of South China University of Technology(Natural Science) >

2024 , Vol. 52 >Issue 2: 50 - 61

DOI: https://doi.org/10.12141/j.issn.1000-565X.220635

Energy, Power & Electrical Engineering

High Frequency Resonance Characteristics Analysis of Voltage Controlled Virtual Synchronous Generator and Suppression Strategy

  • LI Zhi ,
  • LIU Mingbo ,
  • LIU Hui ,
  • SONG Peng ,
  • LI Xudong ,
  • WANG Fan
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  • 1.School of Electric Engineering，South China University of Technology，Guangzhou 510640，Guangdong，China
    2.The Electric Power Science Research Institute，State Grid Jibei Electric Power Co. ，Ltd. ，（North China Electric Power Research Institute Co. ，Ltd. ），Beijing 100045，China
    3.Wind-Solar-Energy Storage Generation Laboratory，State Grid Corporation of China，Beijing 100045，China
    4.CGN New Energy Holdings Co. ，Ltd. ，Beijing 100071，China
    5.Beijing Power Exchange Center Co. ，Ltd. ，Beijing 100051，China
李智（1987-），男，博士生，主要从事电力系统稳定分析与控制研究。E-mail:lizhi18688575@126.com

Received date: 2022-09-29

  Online published: 2023-08-16

Supported by

the National Key R&D Program of China(2022YFB2403500)

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Abstract

Virtual synchronous generator (VSG) simulates the operation mechanism of synchronous generator and introduces active frequency modulation and reactive voltage regulation control link. Different from the traditional current control converter, it is a voltage control strategy. Based on control configuration and power grid and source coordination characteristics, this paper constructed small signal analysis models, analyzed the oscillation modes under variable control parameters and power system parameters. Then it obtained high frequency resonance characteristics of voltage controlled VSG and proposed suppression control strategy. Firstly, this paper established the small-signal analysis models of voltage control virtual synchronous generator and traditional flow converter control and electrical link, respectively. Through eigenvalue analysis method, the oscillation mode and damping ratio of all the eigenvalues were quantitatively analyzed, and it is found that the voltage control virtual synchronous generator has a high frequency oscillation mode similar to the traditional converter. And it analyzed the control parameter change of the virtual synchronous generator and the high frequency resonance damping mechanism of the power grid scene. Then, based on the control strategy of voltage controlled virtual synchronous generator, with the active damping method, the virtual impedance control strategy based on the current inner ring front channel was proposed to suppress the high-frequency resonance. Finally, the proposed control strategy was verified in the loop experiment results using Matlab/Simulink simulation and RT-LAB controller. The results show that the virtual impedance control link effectively plays a positive damping role. Compared with the passive damping method, in the case of no additional measuring point and external control amount, the voltage control VSG network side damping characteristics are improved, the transient response ability is enhanced, and the high frequency instability phenomenon is effectively suppressed.

Key words： virtual synchronous generator; small-signal model; eigenvalue; high frequency resonance; virtual impedance

Cite this article

LI Zhi , LIU Mingbo , LIU Hui , SONG Peng , LI Xudong , WANG Fan . High Frequency Resonance Characteristics Analysis of Voltage Controlled Virtual Synchronous Generator and Suppression Strategy[J]. Journal of South China University of Technology(Natural Science), 2024 , 52(2) : 50 -61 . DOI: 10.12141/j.issn.1000-565X.220635

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