A Fault Location Method Based on Electromagnetic Transient Convolution Considering Frequency-Dependent Parameters and Lossy Ground

TL;DR

This paper introduces an electromagnetic transient convolution method for accurate fault location in power systems, accounting for frequency-dependent parameters and lossy ground effects, demonstrated through simulations on various power network models.

Contribution

The paper presents a novel fault location approach using electromagnetic transient convolution that improves accuracy by considering frequency dependence and ground loss effects.

Findings

Achieves tolerable location errors in simulations

Reduces influence of frequency dependence and ground loss

Operates efficiently with direct convolution method

Abstract

As the capacity of power systems grows, the need for quick and precise short-circuit fault location becomes increasingly vital for ensuring the safe and continuous supply of power. In this paper, we propose a fault location method that utilizes electromagnetic transient convolution (EMTC). We assess the performance of a naive EMTC implementation in multi-phase power lines by using frequency-dependent parameters in real fault simulation, while using constant parameters in pre-calculation. Our results show that the location error increases as the distance between the fault location and the measurement location increases. Therefore, we adopt the aerial mode transients after phase-mode transformation to perform the convolution, which reduces the influence of frequency-dependence and ground loss. We conduct numerical experiments in a 3-phase 100-km transmission line, a radial distribution network and IEEE 9-bus system under different fault conditions. Our results show that the proposed method achieves tolerable location errors and operates efficiently through direct convolution of the real fault-generated transient signals and the pre-stored calculated transient signals.