光储直柔双极系统参数变化会导致正、负极母线电压不平衡，在增加网络损耗的同时还会威胁系统正常运行。对此提出了基于模糊逻辑控制的光储直柔双极系统不平衡电压抑制策略。首先，根据光储直柔双极系统结构和电流平衡方程，分析了系统参数对极间电压不平衡度的影响作用。然后，利用模糊逻辑控制器，根据正负极电压和系统电压不平衡采集数据修正各电源换流器下垂控制参数，调整各电源换流器输出电压和功率，最终将光储直柔双极系统的极间电压不平衡度抑制在可接受范围。在光储直柔双极系统仿真模型上进行的不平衡电压抑制试验验证了所提方法的有效性。

Parameter variations in the photovoltaic,energy storage,direct current, and flexibility(PEPF) bipolar system will lead to unbalanced voltages between the positive and negative busbars, increasing network losses while threatening system stability. To address this, an imbalance voltage suppression strategy based on fuzzy logic control is proposed. Firstly, the impact of system parameters on inter-pole voltage imbalance is analyzed based on the structure of the photovoltaic storage direct-flexible bipolar system and current balance equations. Then, a fuzzy logic controller is employed to adjust the droop control parameters of each power source converter by collecting data on positive/negative busbar voltages and system voltage imbalance. This process modifies the output voltage and power of each power source converter, ultimately suppressing the inter-pole voltage imbalance of the photovoltaic storage direct-flexible bipolar system within an acceptable range. Simulation tests on the photovoltaic storage direct-flexible bipolar system model validate the effectiveness of the proposed method.