Control strategies for PWM rectifier/inverter-fed induction motors

The paper reviews the technology status and control strategies developed for PWM rectifier/inverter-fed induction motor drives with emphasis for its similarities. A review includes: new PWM techniques, field oriented and direct torque control of induction motor (FOC and DTC), voltage oriented and direct power control of a PWM rectifier (VOC and DPC), and novel virtual flux (VF) based sensorless control of a PWM rectifier. Also, neural network and fuzzy logic based intelligent controllers for motion control have been discussed. Selected oscillograms are shown in order to illustrate properties of the described control strategies.