Power and frequency control of an offshore wind farm connected to grid through an HVDC link with LCC-based rectifier

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dc.contributor.advisor Arnaltes Gómez, Santiago
dc.contributor.advisor Rodríguez Amenedo, José Luis
dc.contributor.author Cardiel Álvarez, Miguel Ángel
dc.date.accessioned 2019-01-18T11:18:56Z
dc.date.issued 2018-06
dc.date.submitted 2018-09-28
dc.identifier.uri http://hdl.handle.net/10016/27932
dc.description Mención Internacional en el título de doctor
dc.description.abstract There is an increasing interest in the use of line-commutated converter (LCC) technology to connect large offshore wind farms (OWFs) placed far from the coast by means of a high voltage direct current (HVDC) link. This is due to the better features of LCCs compared to voltage-source converters in terms of cost, reliability and efficiency. However, this technology requires a frequency control in the OWF to allow the operation of both the wind turbine generator systems (WTGSs) and the LCC rectifier. Therefore, this Thesis presents two frequency control proposals. First, a centralized voltage and frequency control for an OWF connected through LCC-rectifier-based HVDC link is proposed. It is derived from an enhanced LCC-rectifier station average-value model which indicates that the active power balance at the point of common coupling drives the OWF voltage while the corresponding reactive power balance drives the OWF frequency. Even though voltage control cannot be applied in case of using a diode rectifier, the voltage magnitude variation is clamped between acceptable values. As a second proposal, a decentralized frequency control for the diode-rectifier-based HVDC link connection of OWFs is also presented. This control is based on a reactive power / frequency droop which allows the WTGSs to reach synchronous operation and equally share the reactive power without the need of communications among the WTGSs. Moreover, the control proposals do not rely on a phase-locked loop, so controls are not subject to grid disturbances or measurement noise. Another important specification of the proposed control strategies is that they do not modify the active power control channel of the WTGSs. Finally, the stability and the simulation results to assess the performance of both control proposals are studied.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.other Wind farms
dc.subject.other Wind energy
dc.subject.other Offshore wind power plant
dc.subject.other Wind turbine generator system
dc.subject.other High voltage alternating current
dc.subject.other HVAC
dc.subject.other High voltage direct current
dc.subject.other HVDC
dc.subject.other OWF interconnection technology
dc.subject.other LCC-rectifier-based HVDC
dc.title Power and frequency control of an offshore wind farm connected to grid through an HVDC link with LCC-based rectifier
dc.type doctoralThesis
dc.subject.eciencia Electrónica
dc.subject.eciencia Energías Renovables
dc.subject.eciencia Ingeniería Industrial
dc.rights.accessRights embargoedAccess
dc.description.degree Programa Oficial de Doctorado en Ingeniería Eléctrica, Electrónica y Automática
carlosiii.embargo.liftdate 2020-03-28
carlosiii.embargo.terms 2020-03-28
dc.description.responsability Presidente: Alireza Nami.- Secretario: Oriol Gomis Bellmunt.- Vocal: Ana Belén Morales Martínez
dc.contributor.departamento Universidad Carlos III de Madrid. Departamento de Ingeniería Eléctrica
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