Insulation design of a medium frequency power transformer for a cost-effective series high voltage dc collection network of an offshore wind farm
Paper in proceedings, 2020
Power electronic converters are among the enabling technologies to establish a series DC intertie system. The most important advantage of a DC/DC converter using a Medium Frequency Power Transformer (MFPT) is its compact size in comparison with a normal grid frequency transformer.
The function of a MFPT is to provide voltage step up and isolation between generators and the HVDC link. The need for a compact structure dictates further design constraints. A MFPT should have a high-power transmission capability from a small volume as well as minimal internal insolation distances. Further-more, in the series DC integration circuit, DC/DC converters can experience a very high offset DC voltage depending on the converter’s position with respect to earth (in the range of one or two hundred kilovolts), while the primary side (wind turbine generator side) is only exposed to a few kV.
Due to its promising features, many research activities have been devoted to the design and optimization of MFPTs. However, only a few activities specifically addressed the insulation requirements for them. In this article, the challenges of the high DC voltage insulation design of a MFPT are presented.
RISE Research Institutes of Sweden
University of Zanjan
Chalmers, Electrical Engineering, Electric Power Engineering, Electrical Machines and Power Electronics
Lecture Notes in Electrical Engineering
1876-1100 (ISSN)Vol. 599 1406-1417
Areas of Advance
Other Electrical Engineering, Electronic Engineering, Information Engineering