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Research and applications of FDMP algorithm for power quality signal analysis

本站小编 哈尔滨工业大学/2019-10-24

Research and applications of FDMP algorithm for power quality signal analysis

ZHAO Yong1, WANG Xue-wei1, WANG Lin2, HAN Dong3, LU Yi-biao3

1.College of Information Science and Technology,Beijing University of Chemical Technology,Beijing 100029,China;2.College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;3.Heilongjiang Electric Power Research Institute,Harbin 150030,China



Abstract:

The accuracy of unsteady-state disturbance analysis of power quality signals is reduced by the steadystate components with high amplitudes and energies. In this paper,a novel frequency-domain matching pursuits (FDMP) algorithm is proposed to estimate the parameters of the steady-state components and separate the unsteady-state disturbances from power quality signals. Firstly,the time-frequency atoms and redundant dictionaries are constructed according to the characteristics of power quality signal spectra. Secondly,the steady-state components and unsteady-state disturbances of power quality signals are decomposed by FDMP into two mutually orthogonal subspaces in Hilbert space. Furthermore,the expressions for parameters calculation of steady-state components have been derived. The experiments show that the relative errors of frequency and amplitude estimations of steady-state components are less than 2 × 10 -4 and 5 × 10 -3 respectively,and phase estimation errors are less than 1. 6° under the existence of both interharmonics and unsteady-state disturbances. The steady-state components and unsteady-state disturbances are separated quickly and accurately.

Key words:  Power quality  unsteady-state disturbance  matching pursuits (MP)  frequency-domain matching pursuits (FDMP)  time-frequency atom

DOI:10.11916/j.issn.1005-9113.2012.01.018

Clc Number:TM711

Fund:


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