Some algorithms for transmission line parameter estimation

Transmission line parameters are inputs to various power system analysis algorithms and precision of these parameters are thus important in ensuring the analysis accuracy. This paper proposes methods for estimating positive-sequence line parameters of series compensated lines. Voltages and currents from two ends of the line are utilized. In addition, algorithms for estimating parameters of non-compensated parallel lines utilizing one end data for special scenarios are presented.

I. Introduction

Transmission line parameters are important inputs to diverse power system analysis programs and algorithms such as protective relaying algorithms and power flow analysis [1] [2]. Precision of line parameters is thus essential in ensuring the accuracy of the obtained analysis results. This paper is concerned with estimating line parameters including series resistance, series reactance and shunt susceptance at the fundamental frequency, which are usually required by power system applications.