基于混合储能SOC分级优化的风光功率平抑策略

Power stabilization strategy of wind-solar complementary system based on SOC optimization of hybrid energy storage

超级电容器与蓄电池构成的混合储能系统(HESS)是解决风光互补型微电网功率波动性的有效途径。本文针对HESS的控制,提出了一种基于电池荷电状态(SOC,State of Charge)分级优化的策略,设计了优化控制层和协调控制层两级平抑系统,并结合超级电容器与蓄电池SOC状态的分级反馈控制,使风光互补型微电网出力波动所造成的电能质量问题得到了很大改善,避免了因蓄电池过充过放而造成的循环寿命减少。通过在Matlab/Simulink环境下搭建系统的模型仿真,验证了该控制策略的有效性。

The hybrid energy storage system（HESS）composed of super-capacitor and battery is an effective way to solve the power fluctuation of wind and solar hybrid microgrid. Aiming at the control of HESS,the hierarchical optimization control strategy is proposed. The two-level stabilization system of optimal control layer and coordinated control layer is designed. Combined with the super capacitor and the SOC state of the battery graded feedback control as well as the classification of super capacitor and battery SOC state feedback control,the power quality problem that the wind and solar hybrid power grid caused by the fluctuation is greatly improved,and it is also avoided that the cycle life of the battery is reduced due to its over charge or discharge. The system model is simulated by Matlab/Simulink. The effectiveness of this control strategy is verified.