LOW FREQUENCY CHARACTERISTIC CORRECTION METHOD OF VSG BASED ON TORQUE QUANTITATIVE ANALYSIS

Yu Hongru; Chen Zhong; Cai Jun; Lu Yin; Shi Yanqiong

doi:10.19912/j.0254-0096.tynxb.2023-0550

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (8) : 135-143. DOI: 10.19912/j.0254-0096.tynxb.2023-0550

LOW FREQUENCY CHARACTERISTIC CORRECTION METHOD OF VSG BASED ON TORQUE QUANTITATIVE ANALYSIS

Yu Hongru¹, Chen Zhong¹, Cai Jun², Lu Yin¹, Shi Yanqiong¹

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Abstract

Firstly, a virtual torque model of virtual synchronous generator （VSG） is established, and the quantitative analysis of virtual torque reveals the main factors that lead to change of the low-frequency characteristics of VSG. That is the coupling effect of sub synchronous resonance on the low-frequency characteristics of VSG and the negative damping effect of phase-locked loop. On the basis of demonstrating the feasibility of increasing damping to suppress sub synchronous resonance, a joint valuing method for steady-state damping and dynamic damping is proposed, and then the influence of dynamic damping on VSG performance is pointed out. The feasibility of suppressing low-frequency oscillations through phase compensation method is demonstrated, and the consistency of the performance indicators of VSG with design expectations is ensured through quantitative correction of VSG torque. Finally, the correctness of theoretical analysis and the effectiveness of design methods are verified through experiments.

Key words

inverter / virtual synchronous generator / low frequency oscillation / damping torque / phase compensation / torque correction

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Yu Hongru, Chen Zhong, Cai Jun, Lu Yin, Shi Yanqiong. LOW FREQUENCY CHARACTERISTIC CORRECTION METHOD OF VSG BASED ON TORQUE QUANTITATIVE ANALYSIS[J]. Acta Energiae Solaris Sinica. 2024, 45(8): 135-143 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0550

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