基于功率差额的光伏微网复合储能容量配置研究

Study on Configuration of the Hybrid-Energy Storage Capacity of PV Micro-grid Based on Power Balance

光伏微电网采用超级电容和锂电池组成混合储能系统,通过发挥两种储能各自的优势来提高系统的整体性能.通过合理配置一个光伏微网系统的储能,在提高复合储能系统利用率的同时保证储能建设的经济性.根据光伏出力和微网负载在孤岛运行时的日能量差额以及概率密度函数,确定复合储能容量约束条件;再根据两种储能的响应时间以及负载优先级情况,提出一种确定复合储能优化配置量方案;最后通过仿真算例验证了根据实际需求设计安装的储能设备能满足对可再生能源利用率和经济性的要求.

PV micro-grid energy storage system using super-capacitor and lithium battery possesses the advantages of two energy storage to improve the performance of energy storage module.Through the rational allocation of a PV micro-network system of energy storage,it improves the utilization of composite energy storage system while ensuring the economy of energy storage construction.According to the difference between daily PV output and the microgrid load during the island operation and its probability density function,the composite storage capacity constraints,constraints can be determined.According to the response time of two energy storage and the priority of load,a scheme to determine the optimal configuration of composite energy storages is proposed.Finally,a simulation example is given to demonstrate that the energy storage equipment designed and installed according to the actual demand can meet the requirements of renewable energy utilization and economy.