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Using of the Virtual Air-gap Technique for Active Filtering
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| Author(s) |
V. Molcrette; F. Lacressonnière; J-L. Kotny; J-P. Swan; J-F. Brudny |
| Abstract |
The aim of the paper is to show the possibility of generating harmonics in the primary winding of a
transformer using a phenomenon called ‘ virtual air-gap ‘. These harmonics due to a variable localised
reluctance of the transformer core can be used to compensate others induced by a non linear load
connected at the transformer secondary. The virtual air-gap is a zone which permeability is adjusted
through small additional windings. The frequency spectrum of the current in these windings is
controlled so that the magnetisation current of the transformer contains the wished harmonics. The
Ampere-Turns law is modified with regard to classical use of a transformer. The experimental
verifications of the modified A.-T. law at no-load is presented. Some characteristics of the primary
current harmonics under non-linear load are proposed. They show the intrinsic filtering capacity of the
virtual air-gap technique. Some conclusions for further developments are finally given. |
| Download |
| Filename: | EPE1999 - PP00673 - Molcrette.pdf |
| Filesize: | 106.4 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-04-06 by System |
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