Two digital filtering algorithms for fast estimation of symmetrical components in power system: a static estimation approach

Author

Soliman, S.A. ; Mostafa, M.A. ; El-Hawary, M.A. ; Al-Kandari, A.M.

Author_Institution

Dept. of Electr. Eng., Qatar Univ., Doha, Qatar

fYear

2001

fDate

2001

Firstpage

125

Lastpage

130

Abstract

This paper presents the application of two digital filters working together for fast estimation of the system symmetrical components. The three-phase unbalanced system is transformed into αβ-transformation. Using such a transformation, harmonics of order 3 and their multiples can be eliminated from the input signal. Having identified the two-phase voltage, the positive and negative sequence phase voltage can be calculated using a constant transformation matrix as well. The zero sequence is easily estimated by averaging the unbalanced three-phase voltage at any sample instant. The least error square algorithm is the parameter estimation algorithm used to identify the magnitude and phase angle of each sequence component from the available samples of the specified component

Keywords

digital filters; harmonics suppression; least squares approximations; power system harmonics; power system parameter estimation; αβ-transformation; constant transformation matrix; digital filtering algorithms; harmonics elimination; input signal; least error square algorithm; negative sequence phase voltage; order 3 harmonics; parameter estimation algorithm; positive sequence phase voltage; power system; static estimation; symmetrical components fast estimation; three-phase unbalanced system; two-phase voltage; unbalanced three-phase voltage averaging; voltage signals modeling; zero sequence; Digital filters; Filtering algorithms; Observers; Power harmonic filters; Power system harmonics; Power system modeling; Power system protection; Power systems; Signal processing algorithms; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Engineering, 2001. LESCOPE '01. 2001 Large Engineering Systems Conference on

Conference_Location

Halifax, NS

Print_ISBN

0-7803-7107-0

Type

conf

DOI

10.1109/LESCPE.2001.941638

Filename

941638