Research on Fuzzy Energy Management Strategy of Hybrid Energy Storage System for Novel Power System

Abstract

Supercapacitors have great power characteristics and can respond to high-frequency volatility and high-power load of lithium batteries. In a hybrid energy storage system (HESS), the introduction of supercapacitors is an effective scheme to reduce the load pressure and charge/discharge current fluctuation of the battery, which can reflect the high energy density characteristics of lithium batteries and extend the life of lithium batteries. To solve the problem of capacity configuration and energy allocation management of HESS, this paper first researches the dynamic programming model of HESS. Taking the minimum life decay increment of lithium batteries as the optimization objective, the energy distribution scheme of the HESS with the minimum life decay of lithium batteries under different supercapacitor configurations is obtained. Then, according to the decay rate of a unit supercapacitor to the capacity decay increment of lithium batteries, the optimal parameters of supercapacitors are selected, and the fuzzy energy management strategy based on the optimal allocation feature of dynamic programming is proposed. Finally, the simulation results show that compared with the traditional filtering algorithm, the reduction of the lithium battery life attenuation of the proposed scheme is about 2.52 times that of the filtering allocation scheme.