A Multi Axis Space Phasor Based Current Hysteresis Controller for PWM Inverters

Mistry, Vinay M and Waikar, SP and Gopakumar, K and Umanand, L and Ranganathan, VT (1997) A Multi Axis Space Phasor Based Current Hysteresis Controller for PWM Inverters. In: 1997 International Conference on Power Electronics and Drive Systems, 26-29 May, Singapore, Vol.1, 480-486.

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Abstract

In conventional three phase current hysteresis controllers, the current error along the three phasc axes arc independently controlled. This will result in random selection of switching vectors causing high inverter switching losses. In this paper, a space phasor based multi axis current hysteresis controller is proposed, in which thc current error along the orthogonal axes (jA, jB, jC ) are monitored. The current error boundary is a hexagon. The proposed control scheme can be implemented using simple look up tables. The advantages of thc proposed current hysteresis controlled PWh4 scheme, when compared to other multi level current hysteresis controllers, is that only the adjacent vectors close to the motor back emf space phasor voltage, is only used for the inverter switching, for the entire speed rangc (optimum PWM switching). In the present scheme, thc selection of the inverter voltage vectors for optimum PWM switching is achieved by, without any computation of the machine voltage space phasor, for the full speed rangc of the drive system. The proposed scheme is self adapting, as far as the motor space phasor voltage is concerned, and also maintains the controller simplicity and quick response features of a hysteresis current controller. The scheme is simulated and also experimentally verified.

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	Copyright 1990 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	21 Apr 2006
Last Modified:	19 Sep 2010 04:25
URI:	http://eprints.iisc.ac.in/id/eprint/6389

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