Title :
Disturbance rejection using sliding mode control of adjustable speed drives
Author :
Ragunathan, K. ; Bikdash, M. ; Homaifar, A.
Author_Institution :
Dept. of Electr. Eng., North Carolina A&T State Univ., Greensboro, NC, USA
Abstract :
We propose a sliding mode controller (SMC) for a nonlinear voltage-controlled DC motor and consider its use for disturbance rejection. The nonlinearity includes the effect of magnetisation saturation and a nonlinear fan load. The performance of the controller under the effects of various torque disturbances and under measurement errors is studied. The SMC is shown to be very effective in suppressing the disturbance when perfect information about the states and disturbance are fed back to the controller. The effect of time delay on the sliding mode controller system is also studied. Using a disturbance observer, an estimate of the disturbance is obtained and fed to the SMC for effective speed control. We are currently tuning this observer and extending it to provide prediction as to reduce the effect of delay
Keywords :
DC motor drives; angular velocity control; delays; nonlinear systems; observers; variable speed drives; variable structure systems; DC motor drive; disturbance rejection; magnetisation saturation; nonlinear systems; nonlinearity; observer; sliding mode control; speed control; time delay; variable speed drives; Control systems; DC motors; Delay effects; Magnetization; Measurement errors; Observers; Sliding mode control; Torque control; Velocity control; Voltage control;
Conference_Titel :
American Control Conference, 2000. Proceedings of the 2000
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-5519-9
DOI :
10.1109/ACC.2000.879476