复合储能中蓄电池荷电状态的自适应控制策略

Adaptive Control Strategy of Battery Charging State in Composite Energy Storage

为解决独立直流微电网复合储能中蓄电池组间的荷电状态不均衡问题,提出了一种蓄电池荷电状态自适应的复合储能控制策略。直流母线电压采用改进下垂控制,对超级电容和蓄电池采用低通滤波器进行平抑功率分频,维持直流母线电压稳定,并且实现蓄电池组的荷电状态均衡;通过在MatLab/Simulink建立含光伏单元、超级电容、蓄电池的直流微电网复合储能模型,验证了所提控制策略的有效性和可行性。

In order to solve the problem of unbalanced state of charge between batteries in the composite energy storage system of independent DC microgrid,an adaptive control strategy of composite energy storage for batteries was proposed. The DC bus voltage adopts improved droop control,and the low-pass filter is used to suppress the power frequency division for supercapacitors and batteries,so as to maintain the voltage stability of DC bus and realize the balance of charging state of batteries. The effectiveness and feasibility of the proposed control strategy are verified by establishing a DC microgrid composite energy storage model with photovoltaic cells,supercapacitors and batteries in MatLab/Simulink.