Open AccessAdaptive algorithm for estimating power frequency phasors using dynamic window length
Author(s) -
Yang Liming,
Jiao Zaibin,
Kang Xiaoning,
Song Guobing,
Suonan Jiale
Publication year - 2016
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.2015.1241
Subject(s) - phasor , computer science , electric power system , fault (geology) , algorithm , window (computing) , control theory (sociology) , protective relay , voltage , phasor measurement unit , power (physics) , electronic engineering , engineering , artificial intelligence , electrical engineering , physics , control (management) , quantum mechanics , seismology , geology , operating system
Estimating phasors as quickly as possible while guaranteeing accuracy is important to ensure reliable fault detection and isolation in power systems. Window length is an important factor for phasor estimation. The conventional fixed window length cannot handle well the many and diverse fault voltage and current signals. By analysing the relationship between accuracy and window length of a phasor estimation using the matrix pencil method, a criterion is established to determine whether or not the estimated phasor is credible. Then, an adaptive algorithm to estimate the phasors using dynamic window length is proposed. Analytical and experimental investigations show that the proposed algorithm can accurately and timely estimate phasors and can enable reliable and quick relay operation.