异步电机无速度传感器直接转矩控制的研究

Research of Sensorless Direct Torque Control for Asynchronous Motor

基于交互式模型参考自适应理论提出了直接转矩控制的无速度传感器方案。参考模型和可调模型使用交互式MRAS方法 ,系统在电机的转速和定子电阻的辨识间切换。由于消除了纯积分和电机漏感对算法的影响 ,该法对电机在低速的工况下具有鲁棒性。对定子电阻的辨识可使得直接转矩控制的低速性能得到改善 ,提高磁链模型的输出精度。计算机仿真结果证明了方案的可行性。

In order to satisfy good performance of AC drive,improve the reliabiligy to system.A mutual model reference adaptive system (MRAS) is proposed to implement a position sensorless direct torque control of an asynchronous machine.The reference model and adjustable model used in the mutual MRAS scheme are interchangeable.For the rotor speed estimation,one model is used as a reference model and another is the adjustable model.Pure integration and stator leakage inductance are removed from the reference model,resulting in robust performance in low and high speed ranges.For the stator resistance identification,the two models switch their roles.Being the scheme,the low speed performance of DTC is improved and the output accuracy of flux model is increased.Computer simulations are given to show its effectiveness.