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含多双向储能变换器的直流微电网通过逆变器接入交流负荷时,会引起直流母线侧产生二次纹波电流,并影响变换器输出电流均分效果。对此,该文提出了双向储能变换器的两带通滤波器二次纹波电流抑制方法,解决了传统电压电流双闭环控制中因限制外环电压的截止频率引起的动态响应速度慢的问题,并增强了二次纹波电流抑制效果。提出了串联微调虚拟电阻的自适应下垂控制方法,减少了储能变换器间输出电压偏差,改善了并联均流效果。在允许的电压偏差范围内,分析了虚拟电阻对输出损失功率和环流的影响,并选取使二者之和达到最小值时合适的控制参数。仿真和实验结果验证了所提方法的有效性。
When a DC microgrid with multi-bi-directional energy storage converter is connected to an AC load via an inverter, secondary ripple current will be generated on the DC bus side and the effect of equalizing the output current of the converter will be affected. In this paper, the paper presents a two-way energy storage converter two-pass filter secondary ripple current suppression method to solve the traditional double-loop voltage and current control loop voltage limit due to the cut-off frequency of the dynamic response slow Problem, and enhance the secondary ripple current suppression. An adaptive droop control method of series trimming virtual resistor is proposed to reduce the output voltage deviation between energy storage converters and improve the parallel current sharing effect. In the range of allowable voltage deviation, the influence of virtual resistance on output loss power and circulation is analyzed, and the appropriate control parameters are selected to minimize the sum of the two. Simulation and experimental results verify the effectiveness of the proposed method.