Control strategy of AC-DC matrix converter in battery energy storage system

This paper is focus on the application of a AC-DC matrix converter (MC) in the battery energy storage system (BESS). The converter topologies of the energy storage system are discussed. A combined control strategy of the AC-DC based BESS is proposed according to the modulation method. At the battery side, the constant current/voltage charging and constant current discharging control are utilized to meet the current-voltage characteristic of the battery and prolong its lifetime. At the grid side, the reactive power control is realized by a simple closed-loop control of the power factor angle. The controller designs are analyzed in detail. An experimental prototype is implemented for evaluation. The results indicated the good dynamic and steady-state performance of the control strategy. The feasibility of using the AC-DC MC in the energy storage application is well verified.