배터리 충, 방전기 및 시뮬레이터를 위한 DAB 컨버터의 제어기 설계

Abstract

Recently, as the demand for DC/DC converters has increased, research on DC/DC converters is being conducted a lot. Among them, the DAB converter can perform soft switching, and since it uses a transformer, insulation can be secured. In addition, since power can be used in both directions, it is a DC/DC converter that is mainly used in DC power distribution systems and widely used as battery chargers and dischargers. When the SPS method is used as the control method of the DAB converter, the light load efficiency is low, so it is difficult to use it in a battery charger. The DPS method and TPS method, which supplemented this, also have disadvantages that are difficult to control as the number of control variables increases. To solve this problem, this paper analyzes three control methods and integrates them into one control variable to improve converter efficiency and THD. In addition, since the conventional controller controls the CC mode and the CV mode separately, chattering or large transients may occur when changing the mode. In this paper, provide a new controller for a battery charger, discharger, and simulator that has a smooth operation of CC-CV mode conversion and protective operation with one controller. DAB Converter was manufactured and its characteristics were verified through simulation and experiment.