Authors:C. ASHOK KUMAR, S. UMA MAHESWARI, C. SUBBA RAMI REDDY
Abstract: A combination of Direct Torque Control (DTC) and Space Vector Modulation (SVM) for an Induction Motor (IM)
drive is defined in this paper. A two-level SVPWM inverter is delivered to the induction motor drive. Using IM model in the
stator D-Q axes reference frame. The inverter voltage is achieved based on input- output feedback linearization control. This
paper signifies a Fuzzy Logic Controller (FLC) for the proposed system. The inputs to the fuzzy logic controller are the
variables of speed error and change of speed error whereas the output is change in switching torque. The effectiveness and
validity of the proposed control approach, attained from the variable methods those are DTC-SVM and FUZZY LOGIC
CONTROL are compared by simulation results.
Keywords: Direct Torque Control (DTC), Adaptive Stator Flux Observer Feedback Linearization, Robust, Space Vector
Modulation, And Fuzzy Logic Control.
INTRODUCTION
Fast dynamic response, strong robustness in the face of
parameter uncertainties are used to characterized DIRECT
TORQUE CONTROL (DTC). High torque ripple [4] is one
of the difficulties of DTC. One of the methods to reduce the
torque ripple is Duty ratio control. In duty ratio control, zero
voltage vectors are applied for the rest of the period, and a
selected output voltage vector is applied for a portion of one
sampling period. The space vector modulation method [5],
[7] is one of the substitute methods to reduce the torque
ripples. The transient merits of DTC are keeping safely by
using DTC-SVM and then provide better quality steadystate
performance in a wide speed range. To exactly
compensate the flux and torque errors to obtain the
reference voltage space vector by using SVM technique at
each cycle period. Based on the input-output feedback
linearization control DTC-SVM scheme for induction motor
drive is developed in this paper.
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