Grid-Connected and Off-Grid Control Strategy for Optical Storage Clusters Based on Phase-Locked-Loop-Free Pre-Synchronisation

doi:10.3969/j.issn.1008-0198.2025.03.016

Hunan Electric Power ›› 2025, Vol. 45 ›› Issue (3): 112-121.doi: 10.3969/j.issn.1008-0198.2025.03.016

• Power Grid Operation and Control • Previous Articles Next Articles

Grid-Connected and Off-Grid Control Strategy for Optical Storage Clusters Based on Phase-Locked-Loop-Free Pre-Synchronisation

ZHENG Qiangren¹, HU Lijuan², Li Baoju³, NiU Geng², XUAN Jingyan¹, WU Ming²

1. Yanbian Power Supply Company of State Grid Jilin Electric Power Company Limited,Yanbian 133002, China;
2. State Grid Shanghai Energy internet Research institute Co., Ltd., Beijing 100192, China;
3. State Grid Jilin Electric Power Company Limited, Changchun 130022, China

Received:2025-01-13 Revised:2025-02-21 Published:2025-07-02

Abstract

Abstract: The control strategy of virtual synchronous generator (VSG) type grid-connected inverter is investigated, and a phase-locked-loop-free pre-synchronous control strategy is proposed, which aims to reduce the impact of grid-connected inverter on the grid, simplify the computation process and maintain the stable operation of the system. Through simulation verification, the strategy can achieve seamless switching between grid-connected and off-grid, has the advantages of simple calculation and fast response speed, and effectively solves the current impact and voltage oscillation problems in the process of grid-connected VSG inverters.

Key words: microgrids, pre-synchronisation techniques, virtual synchronous generators(VSG), seamless switching techniques

CLC Number:

TM732

ZHENG Qiangren, HU Lijuan, Li Baoju, NiU Geng, XUAN Jingyan, WU Ming. Grid-Connected and Off-Grid Control Strategy for Optical Storage Clusters Based on Phase-Locked-Loop-Free Pre-Synchronisation[J]. Hunan Electric Power, 2025, 45(3): 112-121.

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Grid-Connected and Off-Grid Control Strategy for Optical Storage Clusters Based on Phase-Locked-Loop-Free Pre-Synchronisation

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