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Author Tian, H.Y. ♦ Sng, E.K.K.
Sponsorship IEEE Power Electon. Soc
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2004
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Electricity & electronics ♦ Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Thyristors ♦ Inverters ♦ Voltage fluctuations ♦ Leg ♦ Surges ♦ Turning ♦ Switching circuits ♦ Switches ♦ Resumes ♦ Voltage control
Abstract From industrial experience, it is known that three-phase line commutated thyristor inverters encounter commutation failure during voltage dips. Following commutation failure, both upper and lower thyristors belonging to the same leg of the inverter conduct and a surge current results. This paper gives an analysis of this phenomenon in the event of a single-phase dip. A novel and simple solution for turning off the thyristors in the shorted leg is presented. The proposed scheme detects the short circuit and switches off the thyristors to avoid damage due to excessive current build up. When the three-phase source recovers from the dip, the inverter resumes its normal operation. The proposed scheme has quick response and requires no separate voltage source for control circuits. Experimental verification of the thyristor's turn off mechanism is presented to validate the operation principle.
Description Author affiliation: Sch. of Electr. & Electron. Eng., NTU, Nanyang, Singapore (Tian, H.Y.; Sng, E.K.K.)
ISBN 0780383990
ISSN 02759306
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2004-06-20
Publisher Place Germany
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Size (in Bytes) 374.08 kB
Page Count 7
Starting Page 906
Ending Page 912


Source: IEEE Xplore Digital Library