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

Shangen Tian, David Campos-Gaona, Vinícius A. Lacerda, Raymundo E. Torres-Olguin and Olimpo Anaya-Lara
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Shangen Tian: Institute for Energy and Environment, University of Strathclyde, Glasgow G1 1XW, UK
David Campos-Gaona: Institute for Energy and Environment, University of Strathclyde, Glasgow G1 1XW, UK
Vinícius A. Lacerda: Institute for Energy and Environment, University of Strathclyde, Glasgow G1 1XW, UK
Raymundo E. Torres-Olguin: Department of Energy System, SINTEF Energy Research, 7034 Trondheim, Norway
Olimpo Anaya-Lara: Institute for Energy and Environment, University of Strathclyde, Glasgow G1 1XW, UK

Energies, 2020, vol. 13, issue 7, 1-14

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.

Keywords: offshore wind energy; hybrid HVDC converter topology; active power filter; synchronous reference frame (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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