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Energies 2016, 9(10), 826; doi:10.3390/en9100826

Droop Control Design of Multi-VSC Systems for Offshore Networks to Integrate Wind Energy

1
Departament d’Enginyeria Electrica, Centre d’Innovacio Tecnologica en Convertidors Estatics i Accionaments (CITCEA-UPC), Universitat Politecnica de Catalunya, BarcelonaTECH. ETS d’Enginyeria Industrial de Barcelona, Barcelona 08028, Spain
2
Electrical Systems, GE Renewable Energy, Barcelona 08005, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Gianfranco Chicco
Received: 12 August 2016 / Revised: 14 September 2016 / Accepted: 10 October 2016 / Published: 14 October 2016
(This article belongs to the Special Issue Advances in Power System Operations and Planning)
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Abstract

This research envisages the droop control design of multi voltage source converter systems for offshore networks to integrate wind power plant with the grids. An offshore AC network is formulated by connecting several nearby wind power plants together with AC cables. The net energy in the network is transferred to onshore using voltage source high voltage direct current (VSC-HVDC) transmissionsystems. In the proposed configuration, an offshore network is energized by more than one VSC-HVDC system, hereby providing redundancy to continue operation in case of failure in one of the HVDC transmission lines. The power distribution between VSC-HVDC systems is done using a droop control scheme. Frequency droop is implemented to share active power, and voltage droop is implemented to share reactive power. Furthermore, a method of calculating droop gains according to the contribution factor of each converter is presented. The system has been analyzed to evaluate the voltage profile of the network affected by the droop control. Nonlinear dynamic simulation has been performed for the verification of the control principle. View Full-Text
Keywords: droop control; dynamic analysis; frequency control; offshore wind power plant; power sharing; voltage control; VSC-HVDC system droop control; dynamic analysis; frequency control; offshore wind power plant; power sharing; voltage control; VSC-HVDC system
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Raza, M.; Schönleber, K.; Gomis-Bellmunt, O. Droop Control Design of Multi-VSC Systems for Offshore Networks to Integrate Wind Energy. Energies 2016, 9, 826.

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