A Pre-Synchronization Method for Parallel VSGs of Distributed Microgrid Based on Control Mode Switching

Kunyu Dong and Jiaoxin Jia ()
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Kunyu Dong: School of International Education (BAODING), North China Electric Power University, No. 619 Yonghua Road, Baoding 071000, China
Jiaoxin Jia: Key Laboratory of Distributed Energy Storage and Micro-Grid of Hebei Province, North China Electric Power University, No. 619 Yonghua Road, Baoding 071000, China

Energies, 2023, vol. 16, issue 10, 1-13

Abstract: For the pre-synchronization method of the virtual synchronous generator (VSG), only the case of a single VSG pre-synchronization and grid connection has been studied and analyzed. If the phase synchronization of multiparallel VSGs in a decentralized microgrid is realized by controlling a VSG, power circulation exists in the pre-synchronization process. Firstly, the structure and control mode of the microgrid are introduced. For the decentralized structure, a control mode switching mechanism under distributed communication is designed, and a pre-synchronization method of parallel VSGs based on control mode switching is proposed. Secondly, a theoretical analysis of the active power circulation problem is performed by an equivalent frequency model for parallel VSGs in the pre-synchronization process. Finally, the simulation results show that the proposed pre-synchronization method can reduce the dynamic power circulation of parallel VSGs by 83%, and improve the pre-synchronization speed by 75%.

Keywords: VSG; pre-synchronization; virtual power; parallel; power circulation; distributed microgrid (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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