基于等效时间的混合储能系统高功率密度优化配置

High power density optimal configuration for hybrid energy storage system based on equivalent time

越来越多的电力电子装置应用到多电飞机(MEA)电力系统中,导致MEA用电负荷功率呈现脉动特性,采用混合储能系统(HESS)平抑负荷功率脉动。为减少HESS重量,提出了一种高功率密度的优化配置方法。为建立负荷功率与储能介质之间的关系,提出了等效时间(ET)的概念,比较两者的ET常数作为储能系统类型选取的依据。进一步提出空间矢量法,采用能量型储能介质矢量和功率型储能介质矢量合成负荷功率,确定最优单体和截止频率,实现了HESS高功率密度配置。同时,从能量约束和功率约束两个方面进行HESS的容量的计算。最后,通过算例配置和仿真分析验证了本文所提方法的可行性和正确性。

With the increasing applications of power electric devices in More Electric Aircraft（MEA）power system,the electric load power in MEA displays fluctuating characteristics.The Hybrid Energy Storage System（HESS）is selected to smooth load power fluctuation.To reduce the weight of HESS,a method of optimal configuration of high power density HESS is proposed.Firstly,to build the relationship between the load power and storage cells,a concept of Equivalent Time（ET）is put forward and is used as the basis to select the energy storage system type by comparing the equivalent times.Further,the space vector is proposed：to determine the optimal cell and the cutoff frequency,the load energy is synthesized by the energy storage medium vector and the power storage medium vector,realizing the high-power density configuration of HESS.Meanwhile,the HESS capacity is calculated from the energy constraints and power constraints.Finally,the feasibility and correctness of the proposed method in this paper has been verified through the example configuration and simulation analysis.