基于序阻抗的虚拟同步机同步频率谐振现象

doi:10.19595/j.cnki.1000-6753.tces.210697

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Abstract As for the synchronous frequency resonance (SFR) phenomenon existing in virtual synchronous generator (VSG), considering the shortcomings of multi-input multi-output power coupling SFR analysis models, a sequence-admittance and sequence-impedance based SFR analysis method is proposed by modeling the single-input single-output sequence impedance model that can describe the wide-frequency dynamics of the VSG, and the SFR phenomena of single-loop and multi-loop VSG are comparatively studied. Based on the pole distribution map of sequence admittance, the relationships between SFR and the VSG power control loop parameters, virtual impedance, inner-loop control and grid impedance are effectively studied. Based on the Bode diagrams of sequence-impedance, the damping characteristics of SFR with and without the inner-loop control are compared, and then the resonance mechanism of SFR in single-loop and multi-loop VSG is revealed from the perspective of negative damping. By building the experimental platform based on the RT-Box, the SFR phenomena of VSG under different control schemes and grid impedances are verified, indicating the optimal design direction of VSG control.

Key words： Virtual synchronous generator synchronous frequency resonance sequence-impedance negative damping inner-loop control

Received: 18 May 2021

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TM464

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	Articles by authors
	Yu Yanxue
	Guan Wanlin
	Chen Xiaoguang
	Li Haoyu

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Yu Yanxue,Guan Wanlin,Chen Xiaoguang等. Synchronous Frequency Resonance in Virtual Synchronous Generator Based on Sequence-Impedance[J]. Transactions of China Electrotechnical Society, 2022, 37(10): 2584-2595.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.210697 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I10/2584

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