Real wavelet-domain modified phasor: Principle and applications in power systems

Author

Xiangxun, Chen

Author_Institution

Nat. Eng. Res. Center for T&D, China Electr. Power Res. Inst. (CEPRI), Beijing

fYear

2008

fDate

20-24 July 2008

Firstpage

1

Lastpage

7

Abstract

Wavelet transform is a new competitive tool to deal with power quality disturbances. Real discrete wavelet transform (RDWT) is simple, fast and non-redundant, but is regarded to be lack of phase information (PI). This paper presents three RDWT-based PI extraction methods and then develops a modified phasor Z_w(n) in real wavelet domain to analyze single-frequency or narrow-band signal. Amplitude, frequency and phase of the signal simply relate to the phasor. Z_w(n) can be used to separate, identify and quantify frequency disturbance, phase disturbance and amplitude disturbance at one time quickly. Demonstration examples are given. The modified phasor may have practical application in custom power and protective relays.

Keywords

fault diagnosis; power supply quality; power system protection; relay protection; wavelet transforms; PI extraction methods; amplitude disturbance; frequency disturbance; narrowband signal; phase disturbance; phase information; power quality disturbances; protective relays; real discrete wavelet transform; single-frequency analysis; Data mining; Discrete wavelet transforms; Frequency; Narrowband; Power quality; Power systems; Protection; Signal analysis; Wavelet analysis; Wavelet domain; Amplitude disturbance; Frequency disturbance; Modified phasor; Phase disturbance; Phase information; Power quality; Real discrete wavelet transform;

fLanguage

English

Publisher

ieee

Conference_Titel

Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008 IEEE

Conference_Location

Pittsburgh, PA

ISSN

1932-5517

Print_ISBN

978-1-4244-1905-0

Electronic_ISBN

1932-5517

Type

conf

DOI

10.1109/PES.2008.4596005

Filename

4596005