Magnetic Integration and Loss Optimal Control of Four-port Energy Router

The DC energy router is a friendly interface for multiple energy sources. The bidirectional converter is the key component of the DC energy router to realize power interaction between ports. This paper focuses on magnetic integration and efficiency optimized control on the proposed bidirectional four-port energy router. First, the coupling characteristics of the topology of the four-port energy router are analyzed. Based on the decoupling parameter constraints, the operation principle and characteristics of the four-port energy router under extended phase-shift control are analyzed. In order to reduce the leakage inductance and ensure the decoupling characteristics of the four-port energy router, the magnetic integration analysis and design of the inductor are carried out and the finite element simulation verification of the transformer and inductor design are given. By simplifying the analysis of the system loss model, control based on optimized RMS current is determined. The Lagrange extremum method is used to figure out the efficiency optimization variable the four-port energy router achieves soft-switching under the same power, while the RMS current is the smallest. Finally, a four-port energy router simulation model and a prototype experimental platform are built to verify the correctness of analysis and effectiveness of optimal control strategy.