Research on MTPA Control Strategy Based on DPWM and SVPWM Integrated Modulation

In this paper, the low-voltage and high current drive control system for electric mini-vehicle is deeply studied based on the application background of electric mini-vehicle. Firstly, the mathematical model of permanent magnet synchronous motor (PMSM) is established, and the search termination conditions of search method and the dynamic optimization of search step size are analyzed and studied. A maximum torque current ratio control strategy based on improved search method is proposed. Secondly, in order to further improve the efficiency of the controller, an improved search maximum torque current ratio control strategy based on DPWM and SVPWM modulation is proposed. Finally, a new multi MOSFET parallel main circuit structure and layout method are proposed, and a low-voltage high current controller for electric mini-vehicle is developed. The simulation and experimental results show that the control method can improve the accuracy of the maximum torque current ratio control, effectively reduce the loss of the drive system, expand the efficient range of the system, and improve the endurance mileage of the electric mini-vehicle.