Hybrid optimal control method for ISOP-DAB converter based on extended phase shifting
ISOP-DAB converters are mostly used in high-power and high-voltage applications.To reduce the cur-rent stress of ISOP-DAB converters and improve the dynamic performance of the system,this paper proposes a hy-brid optimal control method based on extended phase shift modulation.Firstly,the operating mode and power mod-el of the converter under the extended phase shift are analyzed.The optimal phase shift combination of current stress is obtained through the Lagrangian optimization algorithm,and the virtual voltage balance control scheme is combined to deal with the sudden load change or input voltage disturbance state.At the same time,the average val-ue of input voltage is used to complete the dynamic power balance between modules in combination with the struc-tural characteristics of the converter.Finally,the hybrid optimal control method,the virtual power control based on single phase shifting and the traditional extended phase shifting optimal control are compared.The experimental re-sults show that the hybrid optimal control can achieve current stress optimization at power sharing,improve the en-ergy transmission efficiency,and significantly improve the dynamic characteristics of the converter under disturb-ance.
万方数据
维普
