牵引电动机无速度传感器及带速度重投控制

Speed Sensorless Control and Restarting at Unknown Speed of Traction Motor

研究了无速度传感器控制技术在大功率电力牵引传动系统中应用问题。在异步电动机Luenberger观测器模型基础上推导出速度自适应辨识算法,针对无速度传感器控制在电力牵引中应用的难题——控制系统的带速度重投,提出了一种初始转速自优化搜索算法,可以在很小的电流、转矩冲击下完成重投励磁过程。实验结果表明该无速度传感器控制系统具有非常高的转矩动态调节性能,可以在极低的定子频率下稳定运行,达到工程化应用的要求。

The problems control in high-power electric concerning speed sensorless traction drives was studied. A method to estimate the speed which is based on luenberger adaptive observer of asynchronous motor is presented. The difficult problem when speed sonsenless control is applied in electric traction is to restart the motor when mechanical speed is not known. This paper present a new strategy based self-optimization algorithm for estimating the original speed,during the process, the magnitudes of torque and stator currents is low. The experimental results show this speed sensorless control system has high torque dynamics performance,and allows the motor working at very low stator frequencies, it achieves the demand of the application to engineering.