Power Mode Division Control Strategy for AC/DC Microgrids Considering SOC

Jiangzhou Cheng, Di Xiang (), Cheng Fang and Zhehao Hu
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Jiangzhou Cheng: College of Electricity and New Energy, Three Gorges University Yichang, Yichang 443002, China
Di Xiang: College of Electricity and New Energy, Three Gorges University Yichang, Yichang 443002, China
Cheng Fang: State Grid Hubei Electric Power Company, Yichang Power Supply Company, Yichang 443000, China
Zhehao Hu: College of Electricity and New Energy, Three Gorges University Yichang, Yichang 443002, China

Energies, 2025, vol. 18, issue 2, 1-14

Abstract: Using hybrid energy storage systems, we propose a power mode partitioning control strategy for AC/DC microgrids that effectively mitigates frequency and voltage fluctuations. By incorporating composite virtual impedance, we categorize the state of charge (SOC) into five distinct operational modes. Supercapacitors, known for their dynamic response, are prioritized to counteract power fluctuations. We assign these operational modes to the AC and DC subnetworks based on real-time changes in frequency and voltage. When significant fluctuations occur, coordinated power transmission between the subnetworks and support from the energy storage system ensure that frequency and voltage remain within acceptable limits. Simulations conducted in MATLAB/Simulink confirmed that this control strategy stabilized power fluctuations and addressed the challenges of overcharging and overdischarging in storage batteries.

Keywords: AC and DC microgrids; state of charge; hierarchical coordination control; hybrid energy storage (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: 2025
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