Estimation of the Induction Motor Stator and Rotor Resistance Using Active and Reactive Power Based Model Reference Adaptive System Estimator

Bednarz Bednarz,Dybkowski Dybkowski

doi:10.3390/app9235145

Abstract

In this paper an induction motor parameters estimator, based on the Model Reference Adaptive System (MRAS), is presented and described. A comprehensive literature study on MRAS type parameters estimators for induction motors is also provided. The authors propose a novel PQ-MRAS estimator concept which enables the simultaneous calculation of stator and rotor resistances in the induction machine, which is its major advantage over previous investigations. The estimator employs the active (P) and reactive (Q) power of the machine which is calculated by the only measurable signals, such as stator voltage and current. The paper includes a detailed description of the proposed estimator. The PQ-MRAS was tested for various operating conditions of a drive system with the induction motor. The results obtained from computer simulation tests were verified on the laboratory set up with a DS1202 card.

Highlights

The estimation of induction motor (IM) parameters is an essential research topic in the investigations on electrical drive systems, especially in the case of drives requiring high operational performance and precision
The main goal of the first test was to check the general performance of the PQ-Model Reference Adaptive System (MRAS)
The setup consisted of two induction motors coupled by a clutch—one motor was controlled by the Direct Field Oriented Control (DFOC) algorithm, the other one worked as a load

Summary

Introduction

The estimation of induction motor (IM) parameters is an essential research topic in the investigations on electrical drive systems, especially in the case of drives requiring high operational performance and precision. Modern control methods, such as the Direct Field Oriented Control (DFOC). The Direct Torque Control (DTC) require the information about the internal state variables of the motor. Such signals as an electromagnetic flux, torque (or rotational speed for fully sensorless drives) cannot be measured directly, they are estimated [1,2,3]. Other important parameters encompass inductances, but they are immune to temperature variations [5]

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Conclusion