Research Of High Performance Permanent Magnet Synchronous Motor Drive System For Electric Vehicle

With the increasing of the amount of the automobiles in the world, developing electric vehicles becomes an effective way to solve the crisis of petroleum resource and environmental pollution. Motor drive system, as one of the key technologies of electric vehicles, effect its power performance and distance per charge immediately. Starting from improving operation efficiency of drive system in this paper, improving overall performance of drive system efficiently,while meeting the request to drive system of electric vehicles.Firstly, the mathematical model of PMSM was set up. And the characteristics of the traction requirement of electric vehicles were also analyzed in this dissertation. Comparing the advantage and disadvantage of the mainstream control strategy.on this basis, it choose vector control in this paper. For the characteristic of IPMSM, the MTPA control below the based speed and field-weakening control above the base speed was selected. Finally, this control strategy was realized with MATLAB/simulink.Secondly, optimization design of double closed loop for speed regulation system was proposed. Changing rule of electrical parameter for IPMSM was analyzed. Crossing-couple has an effect on output torque, parameter variation also affects decoupling. And in the complex domain, compared with feedback decoupling, internal model decoupling is insensitive to parameter variation and more effective to decoupling. Furthermore, this paper puts forward a way to improve robustness for current loop in complex domain. Parameter variation has an influence on system performance. A decoupling current regulator with on-line parameter estimation is proposed to improve system performance. Classical PI regulator cannot meet the request of wide speed regulation and load fast changing. Rotate speed regulator adopts adaptive fuzzy PI control. It improves rapidity and disturbance rejection of system. And simulation experiments show its effectiveness.Lastly, For the level limitation of the vehicle battery output voltage. Hybrid modulation technology was proposed. In order to meet the request of low loss and wide speed, reducing output ripple current of inverter, while improving the DC voltage utilization. More, THD of inverter output current levels was analyzed by POWERGUI.