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DTC Scheme for a Four-Switch Inverter- Fed Induction Motor Emulating the Six- Switch Inverter Operation

K. Reddy Swathi, P. Anjappa , V.Ramesh

This paper describes a combination of direct torque control (DTC) and space vector modulation (SVM) for an adjustable speed sensor less induction motor (IM) drive. In this paper we introduced a new strategy i.e., the induction motor drives fed by a four switch inverter emulate the operation of the conventional six switch operation. Therefore, a suitable combination of the four unbalanced voltage vectors intrinsically generated by the FSTPI, leading to the synthesis of the six balanced voltage vectors of the SSTPI. Simulation results have revealed that, the proposed DTC strategy with SVM modulation, FSTPI-fed IM drives exhibit interesting performance