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Abstract
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 known 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 voltage source inverter (VSI) 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.
Highlights
In electrical drive applications, three-phase drives are widely used for their convenience
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 space vector PWM (SVPWM) inverter, using a well known phase transposition in the series connection
Simple control strategy is introduced for three-level SVPWM voltage source inverter (VSI) that can be implemented in practice for a two-series five phase IM drive
Summary
Three-phase drives are widely used for their convenience. It is interesting to note the similarity in switching schemes between the two approaches: for the multilevel inverter the additional switching devices increase the number of voltage levels, while for the multileg inverter, the additional number of switching devices increases the number of phases [15]. Toliyat have made much research on control method and running performance aim at five-phase drive [1], but their subject investigated is the system feeding with two level inverter. The method is not capable to control more series connected multiphase machines or producing nonsinusoidal voltages. In the conventional approach of this technique, the inverter is understood as a whole, allowing full control over the switching sequences of the switches and achieving maximum use of the dc-link voltage. A five-phase 3 level SVPWM algorithm is developed to control a two series IM drive system. Direct torque and flux control is achieved by means of VSC
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