ISOP DAB Application to the Test of Batteries

Batteries testing and maintenance are important tasks to ensure the normal operation of the energy storage system. Traditional testing power supplies mostly use a unidirectional energy-consumption structure, which leads to the slow charging-discharging test speed and low efficiency. This article proposes a dual active bridge (DAB) as the basic module of the input series and output parallel (ISOP) DC converter being a part of the testing power supply, which improves the charging and discharging rate. The article analyzes the working principle and modeling method of ISOP DAB, and the control strategy of ISOP DAB are further studied, and the multi-module input voltage equalization and output current equalization are realized. Finally, the effectiveness of the proposed method is verified by simulated experiments.