Abstract:
A speed control systern for a switched reluctance motor ( SRM ) drive using
proportional-integral control strategy is designed and presenred in this t hesis. Performance
is based on the ability to provide each phase with pulses of current during the torque
productive pends ( the zone of increasuig inductance ) by selecting precietermined switching
angles. The control system maintains the desired speed in the face of variations of the load
or the rnotor parameters. Variable speed can be achieved using this control system.
After reviewing the operating principles of the SRM and its different control
strategics, modeling has ken done under the assurnption of linear magnetic characteristics.
The torque characteristics and the dymmic differen tial equa tions. nevertheless. are nonhear.
The control structure consists of a fdforward controuer and a propoflional-integral speed
controller. A hysteresis controller is also employed t~ maintain the current within a pre-set
band based on a defmed algorithm.
Stability of the nonlinear control system has been investigated using the second
method of Lyapunov and the method of Krasovski
In this thesis, two control schemes; narnely current-source switched reluctance motor
( CSSRM ) and voltage-source switched reluctance motor ( VSSRM ) are designed, analyzed,
and simulated under different working conditions using the Matiab software package to
investigate the steady-state operation and dynamic response of the system. The rnotor
performance and simulation results are discussed.
. .
