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蓄电池/超级电容混合储能系统可以同时发挥蓄电池高能量密度以及超级电容高功率密度的优势,适应用于微网。在Buck/Boost双向功率变换器与直流母线相连的独立光伏微网中,提出一种将储能系统总负荷功率滤波后,采用电流滞环控制蓄电池的充放电、超级电容提供差值功率的新型能量管理方案,以优化对混合储能系统的管理。为平抑光伏出力波动,实现对直流母线电压的控制,针对超级电容的Buck/Boost双向功率变换器,在电压电流双闭环基础上,利用输入电压、负载电流前馈环消除了二者的变化对输出电压的扰动,提高了系统的动态响应速度与控制精度;利用电容电压前馈环消除了由于负载电流大小及方向的改变对系统闭环极点变动的影响,提高了系统的稳定性。仿真结果验证了所提能量管理方案及控制策略的有效性。
Battery / supercapacitor hybrid energy storage system can play the advantages of high energy density and supercapacitors high power density, suitable for micro-grid. In the independent photovoltaic microgrid connected with the DC bus of the Buck / Boost bidirectional power converter, a novel method of controlling the charge and discharge of the battery by using the current hysteresis and filtering the total power of the energy storage system and providing the difference power by the supercapacitor is proposed Energy management solutions to optimize the management of hybrid energy storage systems. In order to stabilize the fluctuation of PV output and realize the control of the DC bus voltage, Buck / Boost bidirectional power converter for supercapacitors eliminated the change between the two by using the input voltage and the load current feedforward loop The output voltage disturbance improves the dynamic response speed and the control accuracy of the system. The capacitor voltage feed-forward loop eliminates the influence of the change of the load current size and direction on the closed-loop pole of the system and improves the stability of the system. The simulation results verify the effectiveness of the proposed energy management scheme and control strategy.