Active Rectifier Based Harmonic Compensator for a Direct Torque Controlled Induction Motor Drive

ABSTRACTHarmonic mitigation is a key issue in industrial as well as commercial drive applications. The wide use of non-linear loads causes significant power quality degradation in power distribution networks. The main objective of this work is to design an active front end rectifier for harmonic compensation. Active filter is used as drive front end so that it can act as a harmonic compensator and also AC to DC converter. This work proposes a dual purpose drive that can be used as a conventional drive and also to cancel out harmonics in line. Inverter in the drive is controlled by using conventional switching table based direct torque controller for induction motor control. Induction motor based on direct torque control (DTC) was implemented by connecting the inverter to the DC link of the active rectifier in order to transfer the power to induction motor through active rectifier DC link. DTC with five-level torque controller was used to minimize torque ripples. A complete simulation model is developed us...