Three-phase voltage outages compensator with cascaded multilevel converter

Archives of Electrical Engineering. Volume 61, Issue 3, Pages 325–336. (2012)

Jan Iwaszkiewicz, Piotr Bogusławski, Antoni Krahel, Eugeniusz Lowiec.

Electrotechnical Institute, The Gdansk Branch, Poland.

 

Abstract

 

 

The paper presents a laboratory prototype of the three-phase transformerless voltage outages compensator with an energy storage based on high voltage supercapacitors. The system described is able to protect an isolated grid e.g. in industry against short voltage interruptions, dips and sags. An idea of a control method as well as a digital controller has been presented, too.

 

 

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Additional Information

 

The paper presents a laboratory prototype of a three-phase transformerless voltage outages compensator with an energy storage based on high voltage stacked supercapacitors. Till now supercapacitors are rarely implemented in energy supply systems. This technology is not widely applied because of high voltage supercaps are still very expensive. But many research centers are involved in novel and promising technologies of such devices.

The compensator system described is able to protect an isolated grid, e.g. in industry, against short voltage interruptions, dips and sags. The study includes main power converter topology considerations, the solutions to the fast identification of grid voltage disturbances as well as compensator phase synchronization with the line voltage. The description of the main operational algorithm of the compensator is also shortly depicted.

The work was started and carried out under the Special Research Project  COST/255 in Electrotechnical Institute The Gdansk Branch (Poland) in 2006.

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