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JEET, Vol. 12, No. 4, July 2017
Sensorless Control of Induction Motor Drives Using an Improved MRAS Observer
Zineb Kandoussi
Area B - Electric Machinery and Power Electronics
Abstract This paper presents sensorless vector control of induction motor drives with an improved model reference adaptive system observer for rotor speed estimation and parameters identification from measured stator currents, stator voltages and estimated rotor fluxes. The aim of the proposed sensorless control method is to compensate simultaneously stator resistance and rotor time constant variations which are subject of large changes during operation. PI controllers have been used in the model reference adaptive system adaptation mechanism and in the closed loops of speed and currents regulation. The stability of the proposed observer is proved by the Lyapunovs theorem and its feasibility is verified by experimentation. The experimental results are obtained with an 1 kW induction motor using Matlab/Simulink and a dSPACE system with DS1104 controller board showing the effectiveness of the proposed approach in terms of dynamic performance.
Keyword Induction motor,Vector control,Improved model reference adaptive system observer,Lyapunov criterion,Parameters identification,dSPACE 1104
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