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Speed and Stator Resistance Estimation of Four Quadrant Vector Controlled IM Drives

Aswathy Vijay, Binojkumar A.C

In this paper, Model Referencing Adaptive Controller (MRAC)based speed and stator resistance estimation of vector controlled induction motor drive ispresented. BothMRACs utilize voltages and currents in synchronously rotating referenceframe anddo not require computation of fluxes. This technique is stable in all four quadrants of operation and also can be used for low speed and zero speed operation. The speed estimation algorithm (i.e., speed estimating MRAS) depends on stator resistance making it sensitive to stator resistance variation.This is compensated by another MRAC making the speed estimation algorithm independent of stator resistance. The proposed method is simulated in MATLAB/SIMULINK and simulation results are obtained