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Novel Control Approach for a Hybrid Grid-Forming HVDC Offshore Transmission System

Tian, Shangen; Campos-Gaona, David; Lacerda, Vinicius A.; Torres Olguin, Raymundo E.; Anaya-Lara, Olimpo
Peer reviewed, Journal article
Published version
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Tian2020nca.pdf (2.727Mb)
URI
https://hdl.handle.net/11250/2670638
Date
2020
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  • Publikasjoner fra CRIStin - SINTEF Energi [1284]
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Original version
10.3390/en13071681
Abstract
This article describes a hybrid topology of high-voltage direct current (HVDC) for offshore wind farms using a series connection of a voltage source converter (VSC) and six-pulse diode rectifier (6P-DR). In this topology, the offshore side VSC (OF-VSC) acts as a grid-forming converter to maintain the PCC (point of common coupling) voltage of offshore wind farms (WF) and frequency. In addition, the OF-VSC functions as an active power filter to suppress the 5th, 7th, 11th, and 13th order harmonic current components produced by the 6P-DR, making it almost sinusoidal. Due to the 6P-DR being used in the hybrid converter, this new configuration reduces the total cost of the converters and losses, while preserving the power flow to the onshore gird. Compared to the fully-rated converter and hybrid converter based on a 12-pulse diode rectifier, the power loss and cost are reduced, and in addition, the proposed hybrid converter does not require a phase shift transformer nor a high number of diodes. A 200 MW in an HVDC transmission system using the hybrid configuration was simulated in PSCAD. The results show that the system operated correctly and the harmonic components were filtered.
Publisher
MDPI
Journal
Energies
Copyright
The Authors

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