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Auxiliary dead-band controller for the coordination of fast frequency support from multi-terminal HVDC grids and offshore wind farms

Jose, Khadijat, Joseph, Tibin, Liang, Jun and Ugalde Loo, Carlos 2018. Auxiliary dead-band controller for the coordination of fast frequency support from multi-terminal HVDC grids and offshore wind farms. IET Renewable Power Generation 12 (13) , pp. 1444-1452. 10.1049/iet-rpg.2018.5485

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Abstract

High-voltage direct-current (HVDC) grids may provide fast frequency support to ac grids with the aid of supplementary control algorithms and synthetic inertia contribution from offshore wind farms. However, when all converters within the HVDC grid are fitted with these supplementary controllers, undesirable power flows and reduced power transfers may occur during a power imbalance. This is due to simultaneous frequency oscillations on the different ac systems connected to the HVDC grid arising during the support operation. To prevent this adverse effect, an auxiliary dead-band controller (ADC) is proposed in this paper. The ADC modifies the dead-band set-point of the fast frequency controllers using measurements of rate of change of frequency and frequency deviation. A four-terminal HVDC integrated with an offshore wind farm is modelled to analyse and study the effectiveness of three different supplementary fast frequency control algorithms. Results show that the proposed ADC scheme improves the performance of fast frequency control algorithms. For completeness, a small-signal stability analysis is carried out to confirm that a stable system operation is maintained.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Institution of Engineering and Technology (IET)
ISSN: 1752-1424
Date of First Compliant Deposit: 18 July 2018
Date of Acceptance: 28 June 2018
Last Modified: 29 Jun 2019 23:38
URI: http://orca.cf.ac.uk/id/eprint/113246

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