Direct torque control algorithm for induction motor drives for the reduction of common mode voltage

This paper presents novel direct torque control (DTC) algorithms for induction motor drives for the reduction of common mode voltage. In the Proposed DTC algorithm-I the space vector plane is divided into six sectors same as that of Conventional DTC algorithm. In the proposed algorithm-II, the space vector plane is divided into twelve sectors instead of six sectors as in conventional DTC algorithm and Proposed DTC algorithm-I. Moreover, the proposed algorithms do not use the zero voltage vectors. To validate the proposed algorithm, numerical simulations have been carried out using MATLAB-Simulink and results are presented and compared. From the simulation results it can be observed the proposed algorithm reduces the common mode voltage variations compared to conventional DTC algorithm.