微电网混合储能系统研究

针对微电网中传统蓄电池储能系统循环寿命短、电压波动大、功率密度低等问题,提出了一种由蓄电池和超级电容器构成的混合储能系统及其控制方法。充分利用两种储能元件的优势,通过设计均压控制策略、功率控制、V/f控制等手段,实现了各蓄电池和超级电容器单体的均压控制;最后建立Matlab/Simulink模型对系统进行仿真。结果表明,该方法减缓了电网负载波动时蓄电池的电流波动,减小了直流母线的电压波动,验证了该方法的可行性。

Research on Hybrid Energy Storage System in Micro-Grid

In view of such flaws as short cycle life, high voltage fluctuation and low power density found in traditional battery energy storage system in micro-grid, a hybrid energy storage system, which is composed of battery and supercapacitor, as well as its control method, has thus been proposed. By making full use of the advantages of the two kinds of energy storage elements, a voltage equalization control of each battery and supercapacitor unit can be achieved with voltage equalization control, power control and V/f control strategies combined. Finally, the system is to be simulated by establishing a Matlab/Simulink model. The results show that the method helps to reduce the current fluctuation of storage battery and the voltage fluctuation of DC bus with the fluctuation of the load of power grid, thus verifying the feasibility of the adopted method.