Application of hybrid energy storage system in medium-low voltage DC distribution network

Abstract

Due to the advantages of high transmission power and low power transmission loss, medium and low voltage DC distribution networks have received increasing attention and application. Especially, the hybrid energy storage device based on storage battery and super-capacitor can improve the power quality and reliability of medium and low voltage DC distribution network. Taking into account the differences in the energy storage characteristics of super-capacitors and batteries, an uninterruptible power supply application mode and multi-mode partition control strategy for hybrid energy storage devices are proposed, which can reduce the dynamic response time of medium and low voltage DC distribution network under the condition of superior power failure. The effectiveness of the strategy and the feasibility of the application mode have been verified by the simulation results based on PSCAD/EMTDC.