An investigation into the limitations of the combined dv/dt and di/dt protection technique for compact d.c. distribution systems

Allan Smith, Dong Wang, Abdullah Emhemed, Graeme Burt

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Abstract

d.c. distribution networks interfaced by two-level voltage source converters (VSCs) are characterised by rapid fault current development, which places severe time constraints on d.c. protection. A proposed solution to ease this is the implementation of advanced converters with current management capabilities such as modular multilevel converter (MMC). However, the limited fault current caused by MMC will make the widely used LV current-based protection less effective. A new method, targeted utility-scale LVDC distribution networks at conditions with limited fault current, combining dv/dt and di/dt has been proposed in literature with promising results for fast and selective protection. However, further investigation must be carried out to determine its applicability and limitations for protecting future compact d.c. distribution systems. This paper presents an investigation into the selective capabilities of the combined dv/dt and di/dt protection technique for a range of fault scenarios. The study considers the effects of sampling frequency, fault locations, and the network architecture with the aim of determining the limitations of the protection method. A simplified converter model with active fault current limiting and blocking capabilities is built in PSCAD/EMTDC and implemented in a radial and ring compact d.c. distribution network to facilitate the study.
Original languageEnglish
Title of host publication2018 53rd International Universities Power Engineering Conference (UPEC)
Place of PublicationPiscataway, N.J.
PublisherIEEE
Number of pages6
ISBN (Electronic)978-1-5386-2910-9
DOIs
Publication statusPublished - 4 Sep 2018
EventThe 53rd International Universities Power Engineering Conference - Glasgow Caledonian University, Glasgow , United Kingdom
Duration: 4 Sep 20187 Sep 2018
Conference number: 53
http://www.upec2018.com/

Conference

ConferenceThe 53rd International Universities Power Engineering Conference
Abbreviated titleUPEC2018
CountryUnited Kingdom
CityGlasgow
Period4/09/187/09/18
Internet address

Keywords

  • LVDC
  • d.c. protection
  • limited fault current

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