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A multilevel inverter with 12-sided polygonal voltage space vector structure is proposed in this paper. The present scheme provides elimination of common mode voltage variation and 5th and 7th order harmonics in the entire operating range of the drive. The proposed multi level structure is achieved by cascading only the conventional two-level inverters with asymmetrical DC link voltages. The bandwidths...
Variation of switching frequency over the entire operating speed range of an induction motor (IM) drive is the major problem associated with conventional two-level three-phase hysteresis controller as well as the space phasor based PWM hysteresis controller. This paper describes a simple hysteresis current controller for controlling the switching frequency variation in the two-level PWM inverter fed...
A current error space phasor based hysteresis controller is proposed for three-level voltage source inverter fed induction motor drive. Only the adjacent inverter voltage vectors forming a triangular sector, in which tip of the machine voltage vector lies, are switched to keep the current error space phasor within the hexagonal boundary. Calculation of the machine voltage vector is not needed and...
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