King Saud University Repository >
King Saud University >
Journal of the King Saud University - Engineering Sciences >

Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/653

Title: Harmonic minimization in a Chopper-type AC voltage controller
Authors: Mohamadein, A.L.
Addoweesh, K.E.
Keywords: Harmonic minimization
AC voltage controller
Voltage controller
Load current
Issue Date: 1994
Publisher: King Saud University
Citation: Journal of King Saud University, Engineering Sciences: 6 (2); 199-216
Abstract: An AC voltage regulator of the chopper-type presents an attractive alternative for AC voltage control. This is attributed to its extended range of control coupled with independence of the switching angles with respect to load phase angle. Moreover. using microprocessors to determine firing instances makes it possible to change regulator's ON and OFF periods at will with appreciable ease. This adds a new merit for this type of controllers since it would be possible to alter the magnitudes of harmonics present in load voltage or even eliminating selected orders. In this paper the values of switching angles yielding minimum harmonic content in load current are determined. Profiles of these angles at different values of load phase angle are presented for cases of out-put load voltage with three, five and seven pulses per haf cycle. Optimal values of switching angles are evaluated using an algorithm based on optimization technique of the direct search method. Validity of the results obtained is confirmed by comparing it with relevant values obtained by direct manipulation for the possible combinations of switching angles. Experimental results obtained from a microprocessor-control-led AC chopper confirming the theoretical analysis are presented. The approach presented is general and can be well extended for harmonic minimization with any number of pulses per half cycle and specific values of load phase angle.
Description: Electrical Engineering Department, College of Engineering, King Saud University, P.O. Box-800 Riyadh 11421, Saudi Arabia email: khaled@ksu.edu.sa
URI: http://hdl.handle.net/123456789/653
Appears in Collections:Journal of the King Saud University - Engineering Sciences

Files in This Item:

File SizeFormat
Harmonic minimization in a Chopper-type AC voltage controller.pdf363.24 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


DSpace Software Copyright © 2002-2009 MIT and Hewlett-Packard - Feedback