混合储能系统平抑光伏功率波动控制策略

Control Strategy for Suppressing Pv Power Fluctuation in Hybrid Energy Storage System

论文提出了一种新的混合储能(HESS)功率分配控制策略,当光伏输出功率波动或者负载变化时,基于超级电容响应速度快、功率密度大的特点,优先让超级电容来平抑功率波动,然后将蓄电池作为后备储能装置,将超级电容的荷电状态(SOC)作为下垂(Droop)控制的输入,来保证超级电容工作在合理的荷电状态(SOC)区间内,论文通过与基于低通滤波算法的分频控制策略进行了对比,结果验证了论文的方法既降低了蓄电池的放电功率和充放电次数,也提高了蓄电池的循环使用寿命。

In this paper,a new power distribution control strategy for hybrid energy storage(HESS)is proposed.When photo⁃voltaic output power fluctuates or load changes,based on the characteristics of fast response speed and high power density of ultraca⁃pacitors,ultracapacitors are given priority to suppress power fluctuations,and then batteries are used as backup energy storage de⁃vices.Supercapacitors charged state of(SOC)is used as prolapse(Droop)control input,to ensure that the super capacitor to work in a reasonable state of charged(SOC)range.In this paper,the frequency control strategy based on low-pass filter algorithm are compared,the results show that this method not only reduces the battery discharge power and the number of charging and discharg⁃ing,also improves the cycle life of the battery.