Direct torque control of a two five-phase series connected Induction Machine drive using a three-level five-phase space vector PWM inverter

This paper describes the decoupled torque and flux control of a two series connected five-phase induction machine (IM) drive that is supplied by a three-level five phase SVPWM inverter, using a well know phase transposition in the series connection. At the first, the decoupled torque and flux controller is developed based on variable-structure control (VSC). Then, a sliding-mode (SM) flux observer in employed to estimate the stator flux; that uses a two reference frames which result in eliminating the speed adaptation. Moreover simple control strategy is introduced for three-level SVPWM inverter that can be easily implemented in practice for a two-series five phase IM drive. Finally, the effectiveness and capability of the proposed control method is verified by computer simulation.