The variable structure approach to control synthesis leads to a systematic desugn technique realizing strong stability characteristics and high speed of response by means of simple control laws. Usually sliding modtion occurs so that the closed loop system becomes less sensitive to parameter variations and noise disturbances. These advantages are contrasted by some undesired effects due to high gain subsystems; typically chattering and control discontinuity prevent us from the implementation. In order to overcome these difficulties the variable structure control has to be modified giving rise to intelligent variable structure systems. A successful approach is obtained by replacing ideal relays by high gain elements and by fading. The dynamic performance improvements are pointed out on a high performance speed control system with PI nonlinear controllers for d.c. or brushless electrical drives.
Intelligent Variable Structure Control in Electrical Drives
LANDI, ALBERTO
1990-01-01
Abstract
The variable structure approach to control synthesis leads to a systematic desugn technique realizing strong stability characteristics and high speed of response by means of simple control laws. Usually sliding modtion occurs so that the closed loop system becomes less sensitive to parameter variations and noise disturbances. These advantages are contrasted by some undesired effects due to high gain subsystems; typically chattering and control discontinuity prevent us from the implementation. In order to overcome these difficulties the variable structure control has to be modified giving rise to intelligent variable structure systems. A successful approach is obtained by replacing ideal relays by high gain elements and by fading. The dynamic performance improvements are pointed out on a high performance speed control system with PI nonlinear controllers for d.c. or brushless electrical drives.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.