Nearly constant switching frequency hysteresis current controller for general n-level inverter fed induction motor drive

Dey, Anubrata and Ramchand, R and Rajeevan, PP and Patel, C and Mathew, K and Gopakumar, K (2011) Nearly constant switching frequency hysteresis current controller for general n-level inverter fed induction motor drive. In: IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society, 7-10 Nov. 2011, Melbourne,Australia Gdansk,Poland.

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Abstract

A current-error space phasor based hysteresis controller with nearly constant switching frequency is proposed for a general n-level voltage source inverter fed three-phase induction motor drive. Like voltage-controlled space vector PWM (SVPWM), the proposed controller can precisely detect sub-sector changes and for switching it selects only the nearest switching voltage vectors using the information of the estimated fundamental stator voltages along α and β axes. It provides smooth transition between voltage levels, including operation in over modulation region. Due to adjacent switching amongst the nearest switching vectors forming a triangular sub-sector, in which tip of the fundamental stator voltage vector of the machine lies, switching loss is reduced while keeping the current-error space phasor within the varying parabolic boundary. Appropriate dimension and orientation of this parabolic boundary ensures similar switching frequency spectrum like constant switching frequency SVPWM-based induction motor (IM) drive. Inherent advantages of multi-level inverter and space phasor based current hysteresis controller are retained. The proposed controller is simulated as well as implemented on a 5-level inverter fed 7.5 kW open-end winding IM drive.

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	Copyright of this article belongs to IEEE.
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	11 Mar 2013 06:30
Last Modified:	11 Mar 2013 06:30
URI:	http://eprints.iisc.ac.in/id/eprint/45932

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