Optimization of current stress for Dual Active Bridge converter based on power compensation control

Abstract

With the rapid development and application of renewable energy, the advantages of DC distribution system are becoming more and more obvious. In the DC distribution system, the DC transformer is a component that connects different voltage DC bus and realizes the connection between DC bus and the renewable energy. Its efficiency and dynamic performance are of great significance. Among them, DAB has been widely studied. In DAB, the current stress is related to the conduction loss of switches. Therefore, this paper first studies the basic principle and basic electrical characteristics under DPS control, and uses the KKT condition to solve the optimization problem with the goal of optimizing the current stress. In order to improve the dynamic performance, this paper proposes power compensation control considering the difference between the theoretical calculation and the actual transmission power. Finally, the simulation is built in PLECS. By comparing SPS control and the optimized control in this paper, it is proved that the optimized control in this paper can reduce the current stress and reduce the loss under the same transmission power. Compared with the traditional PI control, the power compensation control can improve the start-up time and reduce the output voltage variation and recovery time when the load suddenly changes.

Keywords

• DAB
• DPS
• Current stress
• Dynamic characteristic