Impact of Modern Automatic Control Theory on Electrical Drives

Abstract

The very short connection between modern theory of automatic control and developments of electrical drives is largely supported by the progress of microelectronic. This last one proposes faster and faster processors allowing to treat more and more sophisticated control algorithms. As a systematic approach of different drives, a decomposition in two subsystems is firstly introduced: the electromagnetic subsystem and the mechanical subsystem. Then, several control methods are presented such as cascade control with PI regulators, cascade state control with optimal structure and observer. Then, we describe the robust control design, the principle of the gainscheduled adaptive control and the reference model following method. An other control principle is the sliding mode control. Then, several types of electrical drives are treated. The first one is a DC motor drive with a cascade control based on PI regulators. Then an AC motor drive with an orientation on the flux using the cascade state control is presented. The third type is a permanent magnet synchronous motor drive with a sliding mode control of stator currents. Finally, we mention the mechanical system control by presenting a position control according to the principle of the cascade state control. control. control.