A Stabilization Control Strategy for Wind Energy Storage Microgrid Based on Improved Virtual Synchronous Generator

Jingguang Huang, Xinyuan Lin (), Jiahang Sun and Huixin Xu
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Jingguang Huang: National Virtual Simulation Experiment Centre for Electrical Engineering, China Three Gorges University, Yichang 443002, China
Xinyuan Lin: National Virtual Simulation Experiment Centre for Electrical Engineering, China Three Gorges University, Yichang 443002, China
Jiahang Sun: National Virtual Simulation Experiment Centre for Electrical Engineering, China Three Gorges University, Yichang 443002, China
Huixin Xu: National Virtual Simulation Experiment Centre for Electrical Engineering, China Three Gorges University, Yichang 443002, China

Energies, 2024, vol. 17, issue 11, 1-20

Abstract: In high-penetration renewable-energy grid systems, conventional virtual synchronous generator (VSG) control faces a number of challenges, especially the difficulty of maintaining synchronization during grid voltage drops. This difficulty may lead to current overloads and equipment disconnections, and it has an impact on the security and reliability of the system, as well as limiting the dynamic reactive power support capability of the system. To solve this problem, in this study, a wind–solar hybrid power generation system is designed with a battery energy storage device connected on the DC side, and proposes a low voltage ride-through (LVRT) control strategy for the grid-connected inverter based on an improved VSG. The control strategy employs an integrated current limiting technique combining virtual impedance and vector current limiting to ensure that the VSG exhibits good dynamic power support characteristics during symmetrical faults by adjusting the setpoint value of reactive power. At the same time, it maintains the synchronization and power angle stability of the VSG itself to achieve the goal of LVRT. Simulation results show that the proposed control strategy can effectively suppress the renewable power fluctuations (about 30% reduction in fluctuations compared to the conventional strategy) and ensure the safe and reliable operation of the renewable energy sources and VSGs during grid-side faults. In addition, it provides a given reactive power support and stable grid voltage control (voltage dips reduced by about 20%), which significantly enhances the LVRT capability of the hybrid wind–solar-storage generation system.

Keywords: wind–photovoltaic–energy storage hybrid; virtual synchronous generator; low voltage ride-through; reactive support; fault current limit (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: 2024
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