Experience with accumulated phase angle drift measurement for islanding detection

Chang An, Gordon Millar, Graeme Lloyd, Adam Dysko, Graeme Burt, Fergus Malone

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

4 Citations (Scopus)


Distributed generation is increasingly likely to play a major role in electricity supply systems as recognition is made of its low carbon credentials. However, the integration of these units at distribution voltages is a major challenge for utilities. One particular issue is that generators may, unintentionally, continue to supply local demand when areas of the network are isolated from the main system. Reliably detecting this condition is regarded by many as an ongoing challenge as existing methods are not entirely satisfactory. This paper proposes a novel method based on accumulated phase angle drift that provides inherently enhanced stability without unduly sacrificing sensitivity. It is passive and thus requires no additional invasive hardware. Transient simulations have been used to demonstrate its performance [1]. The current paper presents further validation of the PAD method performance resulting from the field trial of a relay connected on the 38kV network at the interface to a 25MW windfarm in Ireland and also supplemented by the results of an on-going laboratory trial at the University of Strathclyde (UoS).
Original languageEnglish
Title of host publication11th international conference on developments in power systems protection, 2012. DPSP 2012.
Place of PublicationNew York
Number of pages6
ISBN (Print)9781849196208
Publication statusPublished - 23 Apr 2012
EventIET DPSP: Developments in Power System Protection 2012 - Birmingham, United Kingdom
Duration: 23 Apr 201226 Apr 2012


ConferenceIET DPSP: Developments in Power System Protection 2012
Country/TerritoryUnited Kingdom


  • accumulated
  • phase angle drift measurement
  • islanding detection
  • frequency estimation
  • stability criteria
  • sensitivity
  • relays
  • power system stability
  • generators


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