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MRAC Based Speed Estimation of Three DTC Techniques for Three-phase Inverter Fed IPMSM Drive
Abstract
This paper aims to study three Direct Torque Control (DTC) techniques for an Interior Permanent Magnet Synchronous Machine (IPMSM) using Model Reference Adaptive Control (MRAC). In the conventional DTC technique using a look-up table, gate signals are given to the Inverter that drives IPMSM. Since it is a 6-sector scheme and the operation of the minimum number of voltage vectors, undesired torque and flux ripples are created. Hence the problem of ripples is reduced by using the DTC-12sector technique, where the stator flux locus is divided into 12 each of 30degrees. Another technique of DTC is the Direct Torque Controlled (DTC)-SVM (Space Vector Modulation) technique. In the DTC-SVM technique by using Space vector pulse width Modulation, an Inverter is operated that drives IPMSM. Maximum Torque Per Ampere (MTPA) control is developed for the utilization of maximum drive efficiency. In addition, the sensor less control technique is implemented to improve the mechanical robustness of the drive and its cost-effectiveness. The sensor less technique that is used for the estimation of speed and rotor position is MRAC. By using MATLAB/Simulink the above schemes are simulated.
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