Research on Synchronous Frequency Oscillation Suppression Strategy for Virtual Synchronous Generator

doi:10.16628/j.cnki.2095-8188.2025.11.002

Abstract

Abstract:

Virtual synchronous generator (VSG) is an effective solution for the friendly integration of large-scale renewable energy. To address the problem of synchronous frequency resonance (SFR) caused by VSG, a small-signal coupling model of active power-frequency and reactive power-voltage is established, the impact of coupling on SFR is analyzed, and the intrinsic causes of SFR are revealed. Then, a virtual impedance feedforward control method is proposed, where the parameters of virtual impedance are designed by comprehensively considering the bandwidth and damping of the active power loop, achieving a good SFR suppression effect. Finally, compared with the traditional virtual impedance method, the superiority and effectiveness of the proposed method is verified by simulations and experiments.

Key words: virtual synchronous generator (VSG), synchronous frequency resonance (SFR), frequency coupling, virtual impedance, feedforward control

CLC Number:

TM46

LYU Zhenhua, LI Qiang, ZHANG Sen, XU Xinghao, ZHAO Zhihong. Research on Synchronous Frequency Oscillation Suppression Strategy for Virtual Synchronous Generator[J]. LOW VOLTAGE APPARATUS, 2025, 0(11): 9-19.

Figures/Tables 25

References 18

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参数	数值
电网线电压U/V	380(1 p.u.)
额定有功功率P_ref/kW	10(1 p.u.)
额定无功功率Q_ref/var	0(0 p.u.)
额定频率ω_n/rad	314(1 p.u.)
电网电感L_g/mH	23.1(0.5 p.u.)
电网电阻R_g/Ω	0.004(0.003 p.u.)
短路比SCR	2
虚拟惯量J_p/(kg·m²⁾	0.013
阻尼系数D_p	5
励磁系数D_q	15