Modeling and Control Strategy Simulation of Dual Active Bridge DC-DC Converter

In order to improve the dynamic response of isolated dual active bridge (DAB) DC-DC converter under input voltage disturbance and load disturbance, in this paper, an Active Disturbance Rejection Virtual Power Control (ADR-VPC) strategy is proposed with direct power control. First the small signal model of DAB converter is established and the design process of ADR-VPC controller is deduced in detail. Finally, the control simulation model of DAB converter is built in Matlab & Simulink simulation software, and the simulation is compared with the traditional DPC control strategy. The simulation results show that the system can obtain better dynamic response and keep the output voltage basically unchanged when the input voltage and load change.