磁悬浮列车在双端供电模式下的无速度传感器控制

Speed Sensorless Control of Maglev Train with Double-End Power Supply

磁悬浮列车实现稳定运行的核心技术在于如何准确获取列车的速度、位置和电机角度信息。针对磁悬浮列车在高速运行时采用并联供电的特殊模式,将交流电机的扩展反电动势原理推广到长定子直线同步电机的控制中,建立长定子直线同步电机供电系统的数学模型;借鉴旋转电机的扩展反电动势原理,设计磁浮列车的扩展反电动势观测器;采用锁相环的方法得到磁悬浮列车的速度以及转子角度。在半实物仿真平台上验证了该无速度传感器控制策略的有效性。

The core technology of the stable operation of the maglev train is how to accurately obtain the train speed,position and motor angle information.In the double-end power supply model of maglev train,the principle of the extended electromotive force(EEMF)of the AC motor is extended to the control of the long stator permanent magnet synchronous linear motor.The mathematic model for the power supply system of long stator permanent magnet linear synchronous motor is established.Based on the principle of EEMF of rotating motor,the EEMF observer of maglev train is designed.The speed of the maglev train and the rotor angle are obtained by the method of phase locked loop(PLL).Through the semi-physical simulation experiments,the speed sensorless control method is verified.