针对采用级联型逆变器的感应电机矢量控制系统,提出了基于反电动势的转速辨识方法。该方法以反电动势作为系统模型输出来构造模型参考自适应系统(MRAS)。MRAS采用参考模型和可调模型并联型结构实现转速辨识,消除了纯积分环节带来的问题。将所提方法应用于感应电机矢量控制系统并通过仿真和试验得以实现。仿真和试验结果表明,该方法易于实现,能够准确估计电机的转速。

A speed identification approach based on the back electromotive force (EMF) was proposed for the induction motor vector control system using cascaded inverter. The method used the backEMF as the system model output to construct the model reference adaptive system (MRAS). MRAS used a reference model and adjustable model parallel structure to achieve speed identification. The problems caused by pure integral part were eliminated. The proposed method was applied to the induction motor vector control system. The simulation and experiment systems were implemented. Simulation and experiment results showed that the method was easy to implement and could accurately estimate the motor speed.

TM 346