A control strategy for islanded DC microgrid with battery/ultra-capacitor hybrid energy storage system

Abstract

Battery and ultra-capacitor respectively has the advantages of high energy density and high power density. Combining them into a hybrid energy storage system (HESS) can meet multiple requirements of microgrid. Balanced system power and stable DC bus voltage are achieved by establishing the power management strategy. A HESS control strategy is designed to meet charging/discharging demand and reduce battery damage caused by frequent charge/discharge current. The model of DC microgrid system with HESS is built on Matlab/Simulink platform and the simulation results verify the feasibility of the control strategy.