Improved Control Strategy of Multi Virtual Synchronous Generators Parallel System

Kai SHI; Bangbang ZHAO; Peifeng XU; Yuxin SUN; Mingwei REN

doi:10.16513/j.2096-2185.DE.2308202

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Distributed Energy ›› 2023, Vol. 8 ›› Issue (2) : 11-18. DOI: 10.16513/j.2096-2185.DE.2308202

Basic Research

Improved Control Strategy of Multi Virtual Synchronous Generators Parallel System

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Abstract

Aiming at the existence of circulation and nonproportional power distribution in the parallel system with multiple virtual synchronous generators (VSGs), an improved power distribution strategy is proposed. Firstly, the parallel pre-synchronization strategy is improved by adding frequency compensation to the active loop to smoothly and steadily integrate the machine into the system and reduce the power oscillation caused by the instantaneous current shock of the parallel connection. Secondly, through the circulation analysis, it is proposed to add voltage compensation to the reactive loop of each VSG, which can guarantee the same output voltage of each VSG, suppress the system circulation, and improve the power distribution accuracy. The correctness of the control strategy is verified through small signal analysis. Finally, the relationship between VSG parameters and proportional power distribution is analyzed. A model of three VSGs in parallel is built in Matlab/Simulink to verify the feasibility of the proposed control strategy, which enables the power to be distributed according to different capacity ratios, and can still operate stably in the face of sudden load changes.

Key words

parallel virtual synchronous generator (VSG) / circulating current / pre-synchronization / power allocation

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Kai SHI , Bangbang ZHAO , Peifeng XU , et al . Improved Control Strategy of Multi Virtual Synchronous Generators Parallel System[J]. Distributed Energy Resources. 2023, 8(2): 11-18 https://doi.org/10.16513/j.2096-2185.DE.2308202

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