Implementation of sensorless SM-DTC with conjoint online parameters identification based on MRAS

Abstract EN

The MRAS based on rotor flux integrated in the direct torque control (DTC-MRAS) is a very good solution in the speed estimation and control of the induction motor without speed sensor, the major problem with this theory is the machine parameters time-varying, which is causing the degradation of the performances and the stability of the drive.

In this work, we aim to implement a DTC based on MRAS for rotor speed estimation and the joint online identification of stator resistance (Rs) and the inverse of rotor time constant (1/Tr).

The proportional-integral regulators (PI) are used in the mechanism adaptation.

Also, a sliding mode controller type is introduced in the speed control loop.

For testing the performance and the stability of the proposed methods, an experimental setup is prepared with Simulink environment and the RTI blocs of the dSPACE card (DS1104).