异步牵引电机全速域直接转矩控制仿真研究

摘要

根据异步电机牵引特性，将电力牵引运行划分为不同调节区，在启动及低速域时，逆变器按脉宽调制方式进行控制，当电机的输出功率达到额定值时，进入方波控制区。针对不同电力运行调节区的特点，研究了一套适合于牵引电机的全速域直接转矩控制算法，同时，采取不同控制算法间切换的过渡策略，有效地避免了磁链和转矩的跳变。最后，基于所建立的仿真模型模拟了异步牵引电机的牵引和制动工况，仿真结果表明该电机驱动系统具有良好的动、静态性能，满足列车运行控制的要求，也验证了该控制方法的正确性和有效性。%Electric traction operation was divided into different operation regulatory regions according to the characteristic of asynchronous motor. Pulse width modulation (PWM) technique was adopted for inverter when starting and running in low speed range,and square wave control was adopted when the output power of induction motor reached the nominal value. A direct torque control scheme being suitable for traction motor in whole-speed range was discussed,and a feasible transition strategy for algorithm switch was also adopted to avoid the jump of flux and torque. Finally,the traction and braking conditions of induction motor were simulated on the basis of the simulation model built,and simulation results show that the motor drive system can obtain a perfect dynamic and static performance,satisfy with the requirements of train control,and the validity and effectiveness of the adopted control method are verified.