DocumentCode :
1490527
Title :
An Adaptive Dynamic Phasor Estimator Considering DC Offset for PMU Applications
Author :
Mai, Rui Kun ; Fu, Ling ; Dong, Zhao Yang ; Kirby, Brian ; Bo, Zhi Qian
Author_Institution :
Dept. of Electr. Eng., Hong Kong Polytech. Univ., Hong Kong, China
Volume :
26
Issue :
3
fYear :
2011
fDate :
7/1/2011 12:00:00 AM
Firstpage :
1744
Lastpage :
1754
Abstract :
A current signal often exhibits dynamic characteristics and contains decaying dc components when an earth fault occurs under power oscillations. In this paper, a dynamic phasor estimator for fault current (DPEFC) is proposed to remove the phasor-estimation errors caused by dynamic characteristics and decaying dc components. The proposed DPEEC estimates dynamic characteristics and decaying dc components accurately by an iterative procedure. It can also eliminate the impacts on phasor estimation by reassigning estimations from discrete Fourier transform with the knowledge of the fundamental phasor and the dc components. The performance of the proposed DPEFC is evaluated by computer-simulated signals and EMTDC-generated signals. The results indicate that DPEFC can achieve accurate phasor estimation of fault current in the presence of dynamic characteristics and decaying dc components with a minimal increase of computational cost which meets the requirements of the application in phasor measurement units.
Keywords :
discrete Fourier transforms; fault currents; iterative methods; phase estimation; phase measurement; DC offset; DPEEC estimation; EMTDC-generated signal; PMU application; adaptive dynamic phasor estimator; computational cost; computer simulated signal; dc component; discrete Fourier transform; dynamic characteristics; earth fault; fault current; iterative procedure; phasor estimation error; phasor measurement unit; power oscillation; Computational efficiency; Discrete Fourier transforms; Estimation; Fault currents; Heuristic algorithms; Phasor measurement units; Power system dynamics; Decaying dc components; discrete Fourier transform (DFT); dynamic characteristics; fault current; phasor estimation; phasor measurement units (PMUs);
fLanguage :
English
Journal_Title :
Power Delivery, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8977
Type :
jour
DOI :
10.1109/TPWRD.2011.2119334
Filename :
5744142
Link To Document :
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