Differential Evolution Applied to DTC Drive for Three-Phase Induction Motors Using an Adaptive State Observer

This paper describes an application of the metaheuristic differential evolution in the drive of three-phase induction motors based on direct torque control and employs a Luenberger observer to estimate the stator flux linkage and rotor speed. In this context, the differential evolution is applied to adjust the gains of the controllers involved in the direct torque control and speed observer estimation loop, as well as the observer matrix. Firstly a proportional-integral controller with anti-windup is considered in speed control loop, whose gains are adjusted empirically and optimally by DE. Furthermore, differential evolution is also considered for optimizing the Luenberger observer parameters for stator current and flux, as well as rotor speed estimation. Simulation tests are presented in order to prove the effectiveness of the proposed method.

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