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Fuzzy Droop Control for SOC Balance and Stability Analysis of DC Microgrid with Distributed Energy Storage Systems
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作者 Jipeng Gu Xiaodong Yang +4 位作者 Youbing Zhang Luyao Xie Licheng Wang Wenwei Zhou Xiaohui Ge 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2024年第4期1203-1216,共14页
The unbalanced state of charge(SOC)of distributed energy storage systems(DESSs)in autonomous DC microgrid causes energy storage units(ESUs)to terminate operation due to overcharge or overdischarge,which severely affec... The unbalanced state of charge(SOC)of distributed energy storage systems(DESSs)in autonomous DC microgrid causes energy storage units(ESUs)to terminate operation due to overcharge or overdischarge,which severely affects the power quality.In this paper,a fuzzy droop control for SOC balance and stability analysis of DC microgrid with DESSs is proposed to achieve SOC balance in ESUs while maintaining a stable DC bus voltage.First,the charge and discharge modes of ESUs are determined based on the power supply requirements of the DC microgrid.One-dimensional fuzzy logic is then applied to establish the relationship between SOC and the droop coefficient R,in the aforementioned two modes.In addition,when integrated with voltage-current double closed-loop control,SOC balance in different ESUs is realized.To improve the balance speed and precision,an exponential acceleration factor is added to the input variable of the fuzzy controller.Finally,based on the average model of converter,the system-level stability of microgrid is analyzed.MATLAB/Simulink simulation results verify the effectiveness and rationality of the proposed method. 展开更多
关键词 DC microgrid distributed energy storage system fuzzy droop control state of charge(soc)balance STABILITYANALYSIS
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Reduced Switching-Frequency State of Charge Balancing Strategy for Battery Integrated Modular Multilevel Converter
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作者 HU Xing ZHANG Jianzhong 《Journal of Donghua University(English Edition)》 CAS 2021年第6期504-510,共7页
A modular multilevel converter(MMC)integrated with split battery cells(BIMMCs)is proposed for the battery management system(BMS)and motor drive system.In order to reduce the switching losses,the state of charge(SOC)ba... A modular multilevel converter(MMC)integrated with split battery cells(BIMMCs)is proposed for the battery management system(BMS)and motor drive system.In order to reduce the switching losses,the state of charge(SOC)balancing strategy with a reduced switching-frequency(RSF)is proposed in this paper.The proposed RSF algorithm not only reduces the switching losses,but also features good balancing performance both in the unbalanced and balanced initial states.The results are verified by extensive simulations in MATLAB/Simulink surroundings. 展开更多
关键词 battery management system(BMS) energy storage system modular multilevel converter reduced switching-frequency(RSF) state of charge(soc)balancing
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