TITLE:
Application of Atomic Sparse Decomposition to Feature Extraction of the Fault Signal in Small Current Grounding System
AUTHORS:
Nanhua Yu, Rui Li, Jun Yang, Bei Dong
KEYWORDS:
Small Current Grounding System; Fault Line Selection; Atomic Sparse Decomposition; Matching Pursuit; Damped Sinusoids
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
October
30,
2013
ABSTRACT: Applying the atomic sparse decomposition in the
distribution network with harmonics and small current grounding to decompose
the transient zero sequence current that appears after the single phase to
ground fault occurred. Based on dictionary of Gabor atoms and matching pursuit
algorithm, the method extracts the atomic components iteratively from the
feature signals and translated them to damped sinusoidal components. Then we
can obtain the parametrical and analytical representation of atomic components.
The termination condition of decomposing iteration is determined by the
threshold of the initial residual energy with the purpose of extract the features
more effectively. Accordingly, the proposed method can extract the starting and
ending moment of disturbances precisely as well as their magnitudes, frequencies
and other features. The numerical examples demonstrate its effectiveness.