Direct self control (DSC) of induction machine utilizing 3-level cascade H-bridge multilevel inverter

This paper presents a new 3-level direct self-control (DSC) scheme for induction motor drive by selecting proper voltage vector for different speed operational. In conventional DTC two different voltage vectors are assigned to vary flux for low speed, medium speed and high speed motor operational. This paper proposed a scheme where only a single voltage vector is applied during low speed, medium speed and high speed motor operating condition, thus resulting hexagonal flux locus. The significant of the proposed method is new scheme improve the torque capabilities and able to achieve fastest torque dynamic performances during large torque demand. A comparison has been carried out between the conventional schemes and proposed method by using the Simulink\MATLAB environment.