无速度传感器控制技术及其在大功率牵引传动中的应用研究

首先介绍在大功率电力牵引交流传动中,速度传感器在实际应用中存在故障率高的问题,总结了采用无速度传感器控制带来的诸多优点,接着分析了目前国外无速度传感器技术研究及其在轨道牵引传动中应用的现状,总结了异步电机转速在线估计的常用方法,分析了各种方法的优缺点和应用前景.针对无速度传感器技术在轨道牵引传动中应用的主要难点--电动机带速度重投、零频附近稳定运行等进行分析,介绍了目前国外解决这几个难点的技术方案,总结了进一步提高转速估计精度的方法,预测了无速度传感器技术在轨道牵引传动中应用的前景.

Research of Speed Sensorless Control Technology and Its Application in High Power AC Traction Drive

The paper points out that the fault level of speed sensors in high power AC traction drive systems it / high and summarizes a lot of merits in sensorless control. Then the paper introduces the present situation of the / speed sensorless technology applied in railway traction in foreign countries, summarizes the common methods con-line speed estimation in induction control, and analyzes their respective advantages, disadvantages and application prospect. Aiming at overcoming the difficulties of restarting the induction motor at an unknown spee and operating it with infinitely slow crossing of the zero speed in speed sensorless technology, the technice schemes for sdution currently available abroad are proposed. Finally, the methods for further improving th speed estimation accuracy are summarized and the prospect of the application of speed sensorless technology railway traction is predicted.