By Topic

A multilevel thyristor rectifier with improved power factor

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Zargari, N.R. ; Rockwell Autom., Cambridge, Ont., Canada ; Yuan Xiao ; Bin Wu

The thyristor bridge rectifier is a reliable and cost-effective topology commonly used in medium-voltage applications. Low and load-varying input displacement factor (IDF) and poor input harmonic current profile are the main drawbacks of this topology and are gaining more and more importance. This paper proposes modification of a conventional (18-pulse) thyristor rectifier to achieve higher power factor. The proposed topology employs one gate-turn-off (GTO) device across each upper bridge to short them out when necessary, hence, lowering the voltage level, decreasing the delay angle, and improving the power factor. In medium voltage (4160-V) AC drives, usually three devices are connected in series to withstand the voltage; therefore, the 18-pulse configuration has the same number of SCRs as compared to a six-pulse bridge. This paper includes analysis, simulation, and a comparison of the proposed topology with the conventional 6-, 12-, and 18-pulse thyristor bridges. Experimental results from a 10-kVA 12-pulse system verify the feasibility of the proposed topology

Published in:

Industry Applications, IEEE Transactions on  (Volume:33 ,  Issue: 5 )