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Direct torque control of squirrel cage induction motor for optimum current ripple using three-level inverter

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2 Author(s)
S. Mukherjee ; Research and Development Centre, Emerson Network Power Private Limited, Thane, India ; G. Poddar

Three-level neutral point clamped (NPC) inverters have been widely used in medium voltage applications. In this study, direct torque control strategy for sensorless squirrel-cage induction motor (SQIM) using NPC three-level inverter is presented. The proposed control strategy optimises the current ripple in steady state and also gives a high dynamic performance of torque in transient state. The advantage of having low dv/dt for three-level inverter output voltage is retained. The control strategy is verified on a 7.5 hp SQIM drive with three-level insulated-gate bipolar transistor (IGBT) inverter. Experimental results validate the steady state and the dynamic performance of the proposed control strategy.

Published in:

IET Power Electronics  (Volume:3 ,  Issue: 6 )