IRAQI JOURNAL OF COMPUTERS, COMMUNICATIONS, CONTROL AND SYSTEMS ENGINEERING

Abstract

A Sliding Mode Control (SMC) with integral surface is employed to control
the speed of Three-Phase Induction Motor in this paper. The strategy used is a modified
field oriented control to control the IM drive system. The SMC is used to calculate the
frequency required for generating three phase voltage of Space vVector Pulse Width
Modulation (SVPWM) invertor. When the SMC is used with current controller, the
quadratic component of stator current is estimated by the controller. Instead of using
current controller, this paper proposed estimating the frequency of stator voltage
whereas the slip speed is representing a function of the quadratic current. The simulation
results of using the SMC showed that a good dynamic response can be obtained under
load disturbances as compared with the classical PI controller; the complete
mathematical model of the system is described and simulated in MATLAB/SIMULINK.