A comparative study of field-oriented control and direct-torque control of induction motors using an adaptive flux observer

Abstract

This paper presents a comparative study of field-oriented control (IFOC) and direct-torque control (DTC) of induction motors using an adaptive flux observer. The main characteristics of field-oriented control and direct torque control schemes are studied by simulation, emphasizing their advantages and disadvantages. The performances of the two control schemes are evaluated in terms of torque, current ripples and transient responses to load toque variations. We can nevertheless observe a slight advance of DTC scheme compared to FOC scheme regarding the dynamic flux control performance and the implementation complexity. Consequently, the choice of one or the other scheme will depend mainly on specific requirements of the application.

Keywords

• DTC
• IFOC
• adaptive flux and speed observer
• sensorless control
• anti-windup PI