基于完备集合经验模态分解的含抽蓄微电网混合储能容量优化配置

Capacity-based optimal configuration of microgrid hybrid energy-storage system with pumped storage based on CEEMDAN

为减缓微电网并网联络线功率波动,拓展混合储能参与系统调节的能力边界,提出一种含抽蓄的微电网混合储能系统结构及基于完备集合经验模态分解(complete ensemble empirical mode decomposition,CEEMDAN)的容量优化配置方法。首先,考虑抽水蓄能、蓄电池的能量型储能特性与超级电容器的功率型储能特性,在微电网中搭建混合储能系统结构模型;其次,根据负荷出力确定联络线协议功率及混合储能总功率,并采用完备集合经验模态分解法对混储系统总功率进行分解;最后,建立以储能年综合成本最小为优化目标的混合储能系统容量优化配置模型,并给出相应求解方法。算例结果表明:较不含抽蓄的混储系统,该结构模型的调控能力得到提升,在有效平抑联络线功率波动的同时提高系统经济性,且蓄电池设备动作频次有所减少,提升了其使用寿命,验证了所提混合储能结构的合理性及优化模型的有效性。

To reduce fluctuation of the tie-line power in the micro-grid and expand the capacity boundary of a hybrid energy storage system(HESS)in regulation,this study proposes an HESS structure with pumped storage and a capacity-optimization method based on CEEMDAN.First,considering the energy-type energy storage of pumped storage and battery and the power-type energy storage of supercapacitors,the HESS in micro-grid is constructed.Next,the power of the tie line and the total power of the HESS are determined according to the load,and CEEMDAN is used to allocate the power of the storage system.With the minimum annual cost of energy storage as the optimization goal,the capacity-based optimal configuration model of the system is established,and the corresponding solution method is given.The simulation results of the example show that the HESS with pumped storage can improve the system economy and prolong the life of the storage equipment according to the stabilization of the fluctuation of tie-line power.The rationality and effectiveness of the proposed optimal configuration method are verified.