基于双闭环的混合储能直流微电网稳定控制策略

Control strategy for stability of hybrid energy storage DC micro-grid based on double closed-loop

针对光伏发电系统功率输出随机性强、波动性大等问题,利用蓄电池-超级电容对光伏发电系统出力的互补特性,构成蓄电池-超级电容和光伏发电的直流微电网系统。在对比分析控制原理的基础上,提出一种适用于直流微电网混合储能的双闭环PI控制策略,在Matlab/Simulink下搭建超级电容器与蓄电池相结合的混合储能的光伏发电系统模型。仿真结果表明,双闭环控制下的微电网具有更好的暂态响应速度及稳定性。

Aiming at the problems of strong randomness and large fluctuation of power output in photovoltaic power generation system, a direct current micro-grid system consisting of battery-supercapacitor and photovoltaic power generation is constructed by utilizing the complementary characteristics of battery-supercapacitor for the output of photovoltaic power generation system. On the basis of comparative analysis of control principle, a double closed-loop PI control strategy for hybrid energy storage in DC micro-grid is proposed. A photovoltaic power generation system model of hybrid energy storage with battery-supercapacitor is built under Matlab/Simulink.The simulation results show that the micro-grid with double closed-loop control has better transient response speed and stability.