High performance control and estimation in AC drives

High performance control and estimation techniques for sensorless drives are very fascinating and challenging subjects of R&D and they have received wide attention in the literature. The paper briefly surveys the modern high performance drive control and estimation methods for AC motor drives. The voltage-fed cage type induction motor drive has been considered in the paper but the control principles can be extended to other types of drives using different types of converters. The vector control methods, advanced scalar controls and adaptive and optimal controls are discussed. The intelligent control with fuzzy logic and neural network has been particularly emphasized. Finally, the estimation of feedback signals has been reviewed.