独立光伏发电系统混合储能协调控制研究

摘要

光伏发电系统具有随机性与波动性,尤其在离网状态下,易引起直流母线电压失稳越限.鉴于此,提出了一种适用于含混合储能的独立光伏发电系统协调控制策略,利用混合储能系统具有功率型与能量型的特性,使独立光伏发电系统满足直流母线电压稳定性的要求.在系统功率平衡的基础上,上述控制策略考虑到储能元件的剩余容量,进而决定了各单元变换器的工作状态,从而解决了直流母线电压稳定及能量优化协调的问题.仿真结果验证了所提出的控制策略在独立光伏发电系统中的可行性与正确性.%The randomness and volatility often exist Photovoltaic (PV) power generation system,which may cause the instability of the dc bus voltage,especially in the condition of off-grid.According to it,a stand-alone PV system for hybrid energy storage is proposed,which uses the characteristics of the hybrid energy storage system (HESS) and meets the needs of the stability of DC bus voltage.The control strategy is based on the balance of power in the system,which considers the residual capacity of energy storage element and determines the working state of each unit converter,then the stability of DC bus voltage and the coordination of energy optimization problem will be solved.The simulation results verify the feasibility and correctness of the control strategy proposed in this paper in the stand-alone PV power system.