Frequency estimation of low-voltage distribution systems in transient processes

Author

Long, J.

Author_Institution

Dept. of Electr. Eng., Guangxi Univ., Nanning, China

fYear

2004

fDate

10-13 Oct. 2004

Firstpage

662

Abstract

A fast algorithm for tracking the frequency of low-voltage distribution systems in transient processes is presented in this paper. A RC circuit is taken into consideration, and the current signal of transient process in the RC circuit is used to estimate the frequency of distribution systems. The transient current signal is proposed to be a sinusoidal signal with an additional decreasing magnitude in the form of exponential functions. Employing central numerical differentiation of 7 sampling points and Lagrange interpolation, the frequency of low-voltage distribution systems in transient process is estimated at an accuracy of 99.99% in half cycle. The simulation results of an example show better dynamic features of the proposed algorithm, the simulation is carried out in Matlab software and a digital control system.

Keywords

RC circuits; digital control; distribution networks; frequency estimation; interpolation; mathematics computing; power system simulation; power system transients; Lagrange interpolation; Matlab software; RC circuit; current signal; digital control system; exponential functions; frequency estimation; low-voltage distribution system; numerical differentiation; sinusoidal signal; transient processes; Circuits; Frequency estimation; Impedance; Interpolation; Lagrangian functions; Low voltage; Power system simulation; Power system transients; Signal processing; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Systems Conference and Exposition, 2004. IEEE PES

Print_ISBN

0-7803-8718-X

Type

conf

DOI

10.1109/PSCE.2004.1397514

Filename

1397514