Controle Direto de Torque do Motor de Indução ... - D.s.c.e. - Unicamp

Abstract
This dissertation presents the performance of a self-tuning PI type fuzzy controller (STPIF) for the
direct torque control (DTC) with space vector modulation (SVM) scheme presented by J. Rodriguez
et al. in 2004. It is also presented a comparative study of the dynamic response of various DTC
schemes for the three-phase induction motor. The STPIF controller determines dynamically the load
angle between the stator and rotor flux space vectors and, consequently, the electromagnetic torque
necessary to supply the motor load. The rule base for the proposed controller is defined in terms of
error "e" and the change of the error "∆e" of electromagnetic torque using triangular and trapezoidal
membership functions. Constant switching frequency and low torque ripple are obtained using SVM.
The performance of the DTC-SVM with the proposed controller is compared with the performance
of the same scheme but using PI controller in terms of several performance indexes such as settling
time, rise time and integral-of-time multiplied by the absolute magnitude of the error index (ITAE).
The simulation results show that the proposed controller ensures fast torque response and low torque
ripple when compared to the PI controller, both implemented in the same DTC-SVM scheme.
Keywords: Induction Motor, Direct Torque Control, Self-Tuning PI type Fuzzy Controller, Scaling
Factors, Hysteresis, PWM, SVM, Space Vectors.
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