Sensor-less Vector speed Control of Induction motor Drives using MRAS technique.

Sensor-less Vector speed Control of Induction motor Drives using MRAS technique.
Author(s):
Supriya A. Pande, Aishwarya A. Apte
Keywords:
Sensorless, Vector control, Indirect field oriented control, Induction motor, MRAS.
Abstract
A model reference adaptive system (MRAS) is simplest speed estimate technique for controlling induction motor from very low to very high speed range. A reference and adaptive model is used to generate two speeds Nr and Nr*, and its error used to control speed as per requirement. This paper presents a new sensor-less vector control scheme consisting on the one hand of a speed estimation algorithm which overcomes the necessity of the speed sensor and on the other hand two different models with the simplest algorithm. In this work, an indirect field-oriented induction motor drive with a MRAS is presented. The design includes rotor speed estimation from measured stator terminal voltages and currents. The estimated speed is used as feed-forward in an indirect vector control system achieving the speed control without the use of shaft mounted transducers with adaptive control. A MATLAB demonstration is done for a high performance of the control scheme under load disturbances and other parameter uncertainties. In order to model and simulate the electrical system, the simulation software Simulink is used.
Article Details
Unique Paper ID: 146854 Publication Volume & Issue: Volume 5, Issue 1 Page(s): 964 - 968
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