Sliding mode control in comparison with other current control methods for a permanent excited synchronous machine

Modern electrical drives require high stationary precision and high dynamics. The power converter is one component of the drive which limits the stationary precision of the drive. The finite switching rate causes current and load ripple which has a direct effect on the accuracy of the speed. The control strategy for the power converter has an essential influence on the ripple of the current as well. Sliding mode control is a control method which takes into consideration that the switching elements of the power converter represent discontinuities. Therefore sliding mode control might offer better qualities of the drive than other power converter control strategies. Although sliding mode has already been dealt with in several publications, so far no comparison between sliding mode control and other power converter control strategies has been published. This paper presents such a comparison and both simulation and practical results are given