Open AccessHigh speed directional relaying algorithm based on the fundamental frequency positive sequence superimposed components
Author(s) -
Gu Bin,
Tan Jiancheng,
Wei Hua
Publication year - 2014
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2013.0440
Subject(s) - phasor , relay , algorithm , fault (geology) , computer science , transmission line , reliability (semiconductor) , protective relay , fundamental frequency , voltage , sequence (biology) , microprocessor , electric power system , fast fourier transform , digital protective relay , power (physics) , transient (computer programming) , transformation (genetics) , engineering , electrical engineering , telecommunications , acoustics , biology , genetics , operating system , quantum mechanics , physics , seismology , computer hardware , geology , chemistry , biochemistry , gene
The conventional travelling wave protection is susceptible to the high frequency transient quantities, which can reduce the protection reliability. A directional‐relay algorithm based on positive sequence superimposed components is proposed in this study. In microprocessor relays, the extraction of fundamental frequency voltages and currents is, conventionally, provided by phasor estimation methods such as the Fourier algorithm. The common required time for fault detection in these relays is approximately one to two cycles. This study presents a high‐speed algorithm for the extraction of fundamental frequency positive sequence voltages and currents superimposed components based on Park transformation. In the meantime, specially designed high speed algorithms to solve the difficult problems that exist in a real system are proposed. Extensive simulations are performed to evaluate the performance of the proposed algorithm. The results show that the algorithm is fast and reliable for power transmission line protections. Also it is immune to fault resistances and system condition.