Modeling of Variable Speed Drive in the Control System Laboratory at the Electrical Department of State Polytechnic of Sriwijaya

Abstract

Induction motors are the most widely used motors currently, because they have a simple construction, are relatively inexpensive, lighter and have high efficiency with an easy to maintain compared to DC Motors. However, in terms of setting the speed and torque of an induction motor it is not an easy problem to do, with the development of control system technology, one way to do this is to use a three-phase VSD (Variable Speed Drive) Inverter to adjust the frequency in order to change the speed of the three-phase induction motor. The inverter converts a constant AC voltage source into an AC voltage source whose frequency can be adjusted between 0-150 Hz. In this study the authors will use the Matlab-Simulink simulation to prove the workings of the VSD (Variable Speed Drive) and AC Motor.