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Open AccessArticle

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

1
Institute for Energy and Environment, University of Strathclyde, Glasgow G1 1XW, UK
2
Department of Electrical and Computer, Engineering, São Carlos School of Engineering, University of São Paulo, Av. Trabalhador São-carlense, 400 São Carlos, Brazil
3
Department of Energy System, SINTEF Energy Research, 7034 Trondheim, Norway
*
Author to whom correspondence should be addressed.
Energies 2020, 13(7), 1681; https://doi.org/10.3390/en13071681
Received: 31 January 2020 / Revised: 23 March 2020 / Accepted: 24 March 2020 / Published: 3 April 2020
(This article belongs to the Special Issue Control Schemes for Wind Electricity Systems)
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. View Full-Text
Keywords: offshore wind energy; hybrid HVDC converter topology; active power filter; synchronous reference frame offshore wind energy; hybrid HVDC converter topology; active power filter; synchronous reference frame
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Tian, S.; Campos-Gaona, D.; A. Lacerda, V.; Torres-Olguin, R.E.; Anaya-Lara, O. Novel Control Approach for a Hybrid Grid-Forming HVDC Offshore Transmission System. Energies 2020, 13, 1681.

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