An optimal control method for transmission power of ISOP-DAB converter based on cooperative game

The input series output parallel DAB (ISOP-DAB) converter composed of multiple dual active bridge (DAB) converters is often used in high-voltage direct (HVDC) current transmission systems. When the modules of the ISOP-DAB converter have different parameters, the common power averaging control may not achieve high transmission efficiency. To address this, an optimal control strategy based on cooperative game theory is proposed. This strategy optimizes the power transmission of each DAB module under dual phase shift (DPS) control, reducing transmission loss and improving system efficiency. Firstly, the mathematical model of ISOP-DAB converter is built, and then the influence of converter parameters on transmission efficiency is analyzed. And then, considering the operational carrying capacity of each module and introducing power fluctuations, a transmission power optimization control method based on cooperative game theory is proposed to improve the transmission efficiency of the converter. Finally, simulation results show that the proposed optimized control result improves the transmission efficiency by 4% compared to the power averaging control. The experimental results also show that the optimization control proposed in this paper can further improve the transmission efficiency by 3.5% compared to the power averaging control.