Power Transmission from Large Offshore Wind Farms

Jørgen Kaas Pedersen

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    The major part of the coming wind farms in Denmark will be placed offshore. If the location is near a grid with a high short circuit level the power can be transmitted as AC.If the wind farm is far away from the grid and the grid perhaps has a low short circuit level, the best solution for transmitting the power can be by DC. At the moment it is possible to build self-commutating DC/AC-inverters up to about 150 kV. This paper will show a concept to a solution for a wind farm and a transmission system based on synchronous generators or a powerformer® with a rated voltage of 50 kV. The AC power will be rectified and boosted to a fixed DC voltage (e.g. 100 kV). The speed of the generator will be variable, depending of the wind but also controlled with the duty-cycle of the booster. In that way all wind turbines can be connected to the same DC bus and the cable to the inverter station connected to the AC grid.A simple comparison between this solution and a HVDC Light solution with induction generators will be done, as well as a few simulations showing the coherence between the speed of the synchronous generator and the duty cycle of the booster.
    Original languageEnglish
    Title of host publicationUpec'99
    Place of PublicationLeicester
    PublisherLeicester University
    Publication date1999
    Publication statusPublished - 1999
    EventUPEC 1999: 34th Universities’ Power Engineering Conference - Leicester, United Kingdom
    Duration: 14 Sep 199916 Sep 1999
    Conference number: 34


    ConferenceUPEC 1999: 34th Universities’ Power Engineering Conference
    CountryUnited Kingdom

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