Study of Induction Motor Drive With Indirect Vector Control Using Space Vector Pulse Width Modulation

Abstract

Induction motors are thee starting point to design an electrical drivee system which is widely used in many industrial applications. Inn modern control theory, different mathematical models describe induction motor according to thee employed control methods. Vector control strategy can bee applied to this electrical motor type inn symmetrical three phase version or in unsymmetrical two phase version. The operation of the induction motor can be analyzed similar to a DC motor through this control method. With the Joint progress of thee power electronics and numerical electronics it is possible today to deal with thee axis control with variable speed inn low power applications. With these technological projections, various command approaches have been developed by the scientific community to master inn real time, thee flux and thee torque of thee electrical machines, thee indirect vector control (IVC) scheme being one of the most recent steps in this direction. This scheme provides excellent properties of regulation without rotational speed feedback. Inn this control scheme thee electromagnetic torque and stator flux magnitude are estimated with only stator voltages and currents and this estimation does not depend on motor parameters except for thee stator resistance.
Inn this dissertation report conventional IVC scheme has been described. Induction motor has been simulated inn stationary d-q reference frame and its free acceleration characteristics are drawn. Conventional IVC scheme has been simulated with a 50 HP, 460V, 50Hz induction motor. Literature review has been done to study the recent improvements inn IVC scheme which somehow is abe to overcome the drawbacks of conventional one.
Thee space vector modulation technique (SVPWM) is applied to 2 level inverter control inn thee vector control based induction motor drivee system, thereby dramatically reducing thee torque ripple. Later inn this project space vector PWM technique will be applied to IVC drivee system to reduce thee torque ripple.