Abstract：Aiming at the problem of DC bus voltage and power fluctuations caused by the instability of

distributed photovoltaic output，an improved variable domain fuzzy control strategy was proposed for bidirectional

DC-DC converters in energy storage systems. The method corrected the upper and lower limits of the domain

through changes in light intensity and bus voltage，improving the response speed and dynamic stability of PI

control. In addition，to improve the utilization rate of distributed photovoltaic power plant output and extend the life of energy storage systems，it was proposed to switch between energy storage systems and mains power systems through light intensity and state of charge（SOC）of the energy storage system. Finally，the effectiveness and stability of the proposed control strategy were verified through Matlab/Simulink software simulation.

        Key words：distributed photovoltaics；bidirectional DC-DC converter；municipal power supply；variable

domain fuzzy control；light intensity；DC bus

     Format Citation:杨旭东，刘春江，刘叶瑞,等. 基于变论域模糊逻辑的直流母线控制策略[J].电气传动,2026,56(10):69-77. YANG Xudong，LIU Chunjiang，LIU Yerui,et al. DC bus control strategy based on variable domain fuzzy logic [J].Electric Drive, 2026,56(10): 69-77