Robust Speed Control of a Sensorless Driving System with Field-Oriented Induction Machine

Abstract

A control structure based on the Hinfinit-theory is proposed to implement a sensorless speed-control drive-system with induction machine. The rotor speed is estimated in two different ways, namely by a model reference adaptive system based algorithm and by a full-order observer based structure, with information from stator variables fundamentals (voltage, current). The major sensorless solution disadvantages, namely the variation of parameters in the estimating algorithm and the low-speed and zero stator-frequency problems, are now transferred to be solved by the robust controller. Computer simulated results are given to show the robustness of the sensorless control drive system.