Performance of power swing blocking methods in UPFC-compensated line

Jalal Khodaparast, Mojtaba Khederzadeh*, Filipe Faria da silva, Claus Leth Back

*Corresponding author

Research output: Contribution to journalJournal articleResearchpeer-review

10 Citations (Scopus)
5 Downloads (Pure)


Power swing blocker (PSB) is a complementary part in distance relay that detects power swing. Unified power flow controller (UPFC) is also used in a transmission line to control active and reactive power. The UPFC operation during power swing influences the performance of PSBs in different ways. In this paper, 4 PSB methods are programmed, and their indices are analyzed in UPFC-compensated line. The methods based on (1) rate of change of power and (2) fundamental frequency of instantaneous 3-phase active power are used to show the influence of nontransient response of UPFC. The method based on rate of change of impedance is used to show the influence of transient response of UPFC. Method based on transient monitor is used to show the impact of electrical part of UPFC. Indices of these methods are examined in compensated condition, and it is shown that indices may no longer work.
Original languageEnglish
Article numbere2382
JournalInternational Transactions on Electrical Energy Systems
Issue number11
Number of pages17
Publication statusPublished - Nov 2017


  • Distance relay
  • Power swing
  • Power swing blocker (PSB)
  • Unified power flow controller (UPFC)

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