Research on the Method of Microgrid Based on Controlling Hybrid Energy Storage System to Ensure Power Quality

Abstract

It is proposed to adopt two kinds of storage battery equipment in microgrid, energy storage zinc bromine flow battery and power storage lithium titanate battery. The hybrid energy storage system adopts micro-grid DC/DC converter and DC/AC converter two-stage control. The hybrid energy storage DC/DC converter control adopts a distribution method based on power fluctuations and constant current fast charge control, and the hybrid energy storage DC/AC converter adopts PQ control and an improved droop uniform frequency control method. The algorithm automatically switches in all kinds of operation modes of the microgrid to achieve the power quality indicators, such as voltage sag, frequency deviation, voltage deviation and voltage fluctuation, during the operation of the microgrid to meet the operating requirements. The simulation results prove that the control method is correct.