Study on application of morlet complex wavelet in digital protective relays

Author

Zhongwei, Li ; Li, Cheng ; Weiming, Tong

Author_Institution

Dept. of Electr. Eng., Harbin Inst. of Technol., Harbin, China

fYear

2009

fDate

6-7 April 2009

Firstpage

1

Lastpage

4

Abstract

To overcome the disadvantages of full-wave Fourier algorithm that can not filter decaying DC component and has bad frequency characteristic, Morlet complex wavelet amplitude algorithm is studied. After analyzing the influence of parameters m, c and N to Morlet complex wavelet amplitude algorithm and the question that one-circle Morlet complex wavelet amplitude algorithm can not filter the two times harmonic component, difference filter adding one-circle Morlet complex wavelet amplitude algorithm is presented. The performance of full-wave Fourier algorithm, difference filter adding one-circle Morlet complex wavelet amplitude algorithm and three-circle Morlet complex wavelet amplitude algorithm are compared by simulation. The results of simulation indicate that Morlet complex wavelet amplitude algorithm can filter decaying DC component, has better frequency characteristic and higher calculating precision. It can acquire more precise results than the full-wave Fourier algorithm.

Keywords

relay protection; wavelet transforms; difference filter; digital protective relays; full-wave Fourier algorithm; morlet complex wavelet; Algorithm design and analysis; Digital relays; Discrete wavelet transforms; Frequency; Gaussian processes; Power harmonic filters; Protection; Protective relaying; Signal resolution; Wavelet analysis; Morlet complex wavelet; amplitude of fundamental component; difference filter; digital protective relays;

fLanguage

English

Publisher

ieee

Conference_Titel

Sustainable Power Generation and Supply, 2009. SUPERGEN '09. International Conference on

Conference_Location

Nanjing

Print_ISBN

978-1-4244-4934-7

Type

conf

DOI

10.1109/SUPERGEN.2009.5347918

Filename

5347918