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Progressive fault isolation and grid restoration strategy for MTDC networks

Dantas, Rui, Liang, Jun, Ugalde Loo, Carlos, Adamczyk, Andrzej, Barker, Carl and Whitehouse, Robert 2018. Progressive fault isolation and grid restoration strategy for MTDC networks. IEEE Transactions on Power Delivery 33 (2) , pp. 909-918. 10.1109/TPWRD.2017.2720844

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Abstract

A multi-terminal dc (MTDC) grid has a number of advantages over traditional ac transmission. However, dc protection is still one of the main technical issues holding back the expansion of point-to-point dc links to MTDC networks. Most dc protection strategies are based on dc circuit breakers (DCCBs); however, DCCBs are still under development and their arrival to the market will come at an unclear time and cost. Conversely, ac circuit breakers (ACCBs) are readily available and represent a more economic alternative to protect dc networks. Following this line, a protection strategy for MTDC grids is proposed in this paper. This uses ACCBs for dc fault current clearing and fast dc disconnectors for fault isolation. The faulty link is correctly discriminated and isolated while communication links are not required. This strategy contributes to a reduced network outage period as the non-faulty links are out of operation for a relatively short period of time and are restored in a progressive manner. The effectiveness of the proposed strategy is tested in PSCAD/EMTDC for pole-to-ground and pole-to-pole faults.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
ISSN: 0885-8977
Date of First Compliant Deposit: 23 August 2017
Date of Acceptance: 10 July 2017
Last Modified: 27 Mar 2019 23:43
URI: http://orca.cf.ac.uk/id/eprint/103882

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