基于SVPWM过调制的超前角弱磁控制永磁同步电机的策略研究

Research on Over-Angle Weakening Control Strategy Based on SVPWM Overmodulation

研究了电动车用内置式永磁同步电机的控制策略,提出了超前角弱磁控制与空间矢量脉宽调制(SVPWM)过调制结合的控制系统。超前角弱磁控制使用转速、电流和电压的3个闭环控制,电机端电压与直流侧电压组成电压控制环,产生电机弱磁的电流超前角直接给定交直轴电流。SVPWM过调制算法可以有效提高逆变器输出电压基波幅值,电机使用弱磁控制方式达到最大转速后使逆变器进入过调制状态,最大限度扩大转速范围。对该控制系统进行了仿真研究,仿真结果证明了理论分析的正确性和可行性。

The control strategy of built-in permanent magnet synchronous motor for electric vehicle was studied,and a control system combining super-angle weakening control and SVPWM overmodulation was proposed.The front angle weak magnetic control used the three closed-loop control of the speed,current and voltage.The motor terminal voltage and the DC side voltage form the voltage control loop,which produced the motor current field.SVPWM overmodulation algorithm could effectively improve the inverter output voltage fundamental amplitude,the motor used the field weakening control mode to achieve the maximum speed after the inverter into the modulation state,the maximum expansion of the speed range.The control system was simulated and the simulation results proved the correctness and feasibility of the theoretical analysis.