光伏发电系统的不稳定性严重影响储能系统的使用寿命。文章基于扩展卡尔曼滤波(Extended Kalman Filter，EKF)实现超级电容的荷电状态(State of Charge，SOC)估算，并根据光伏输出的实时功率和超级电容的SOC，提出一种新型可控拓扑结构，实现超级电容与蓄电池的混合储能，减缓了蓄电池充电电压突变的影响。在MATLAB/Simulink中搭建仿真模型，结果表明，在混合储能策略下，EKF估算SOC的误差在 4%以内，明显抑制了蓄电池输入端电压的波动，可有效降低光伏输出不稳定性对蓄电池使用寿命的影响。
Photovoltaic applications based on hybrid energy storage of supercapacitors and batteries
The instability of power generation in photovoltaic power generation system is difficult to avoid,and its instability will cause a great burden on the energy storage system,of which the impact on the service life of the battery is the most serious.Based on extended Kalman Filter(EKF)to achieve supercapacitor state of charge(SOC)estimation,according to the real-time photovoltaic output power and SOC of the supercapacitor,a new controllable topology is controlled to achieve hybrid energy storage of supercapacitor and battery,so as to alleviate the sudden change of battery charging voltage.In MATLAB/Simulink,the simulation model is constructed,the results show that the error of EKF estimating SOC is within 4%,and the fluctuation of the input voltage of the battery is significantly suppressed under the hybrid energy storage strategy,which can effectively reduce the impact of photovoltaic output instability on battery service life.
photovoltaic power generationsupercapacitorshybrid energy storagesuppress fluctuation
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