Hierarchical control of offshore wind farm connected by parallel diode-rectifier based HVDC and HVAC links
Yu, Lujie and Li, Rui and Xu, Lie (2019) Hierarchical control of offshore wind farm connected by parallel diode-rectifier based HVDC and HVAC links. IET Renewable Power Generation, 13 (9). pp. 1493-1502. ISSN 1752-1416 (https://doi.org/10.1049/iet-rpg.2019.0033)
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Abstract
This article investigates the operation of offshore wind farm connected by parallel diode-rectifier-based HVDC (DR-HVDC) and HVAC links. A secondary voltage control is proposed to control the offshore AC voltage amplitude by regulating the DC voltage of the DR-HVDC link. A secondary frequency control and a phase angle control are proposed to adjust the reactive power reference in the primary control, which synchronise the offshore point of common coupling (PCC) frequency and phase angle to those of the HVAC link. Such secondary voltage control, frequency control, and phase angle control enable seamless transition from DR-HVDC mode to parallel mode. A tertiary power control scheme is further proposed to control the active power flow distribution between DR-HVDC and HVAC links through the regulation of PCC phase angle. To ensure smooth transition from HVAC mode to parallel mode, a virtual DC power control is proposed to control the virtual DC power at zero prior to the connection of the DR-HVDC link. A small-signal model of the parallel system is developed, and the stability analysis is carried out for the proposed control scheme. Simulation results in PSCAD/EMTDC verify the proposed control under normal and fault conditions.
ORCID iDs
Yu, Lujie ORCID: https://orcid.org/0000-0002-0889-7751, Li, Rui ORCID: https://orcid.org/0000-0001-8990-7546 and Xu, Lie ORCID: https://orcid.org/0000-0001-5633-7866;-
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Item type: Article ID code: 67365 Dates: DateEvent8 July 2019Published20 March 2019Published Online18 March 2019AcceptedSubjects: Technology > Electrical engineering. Electronics Nuclear engineering Department: Faculty of Engineering > Electronic and Electrical Engineering Depositing user: Pure Administrator Date deposited: 19 Mar 2019 15:17 Last modified: 21 Sep 2024 00:40 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/67365