Showing papers by "Navid Reza Abjadi published in 2010"

Model Following Sliding-Mode Control of a Six-Phase Induction Motor Drive

Abstract: In this paper an effective direct torque control (DTC) and stator flux control is developed for a quasi six-phase induction motor (QIM) drive with sinusoidally distributed windings Combining sliding-mode (SM) control and adaptive input-output feedback linearization, a nonlinear controller is designed in the stationary reference frame, which is capable of tracking control of the stator flux and torque independently The motor controllers are designed in order to track a desired second order linear reference model in spite of motor resistances mismatching The effectiveness and capability of the proposed method is shown by practical results obtained for a QIM supplied from a voltage source inverter (VSI)

Three-Level Five-Phase Space Vector PWM Inverter for a Two Five-Phase Series Connected Induction Machine Drive

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.

A Two-Frequency Quasi Six-Phase Voltage Source Inverter Based on Space Vector PWM

Abstract: With development of series multi-phase motor drives and harmonic injection technique to enhance torque for multi-phase motor drives, there is an immense need for multifrequency PWM voltage source inverters (VSI).The PWM techniques used in the previous works are either of ramp-comparison or of hysteresis type. The first suffer from implementation difficulties and the second has the high variable switching frequency drawback (difficulties of LC input EMI filter design). SVM possesses many advantages over the mentioned PWM techniques and it can be used in multiphase drive applications.One of the most popular multi-phase machines is quasi six-phase (QS) machine. The phasor diagram of a QS system and a two level six-phase VSI are depicted in Fig. 1. Despite the three-phase case the numbers of switching vectors are very high (refer to Fig. 2) and the removal of low-order harmonics in SVM six-phase systems is so complicated. In this paper, a two frequency QS SVM VSI is designed and implemented. The appro...