An Intelligent and Efficient Fault Location and Diagnosis Scheme for Radial Distribution Systems

Abstract

In this paper, an effective fault location algorithm and intelligent fault diagnosis scheme are proposed. The proposed scheme first identifies fault locations using an iterative estimation of load and fault current at each line section. Then an actual location is identified, applying the current pattern matching rules. If necessary, comparison of the interrupted load with the actual load follows and generates the final diagnosis decision. Effect of load uncertainty and fault resistance has been carefully investigated through simulation results that turns out to be very satisfactory.

Fault Locating, Prediction and Protection (FLPPS)

“…"An intelligent and efficient fault location and diagnosis scheme for radial distribution systems [6]" proposes a fault location algorithm which identifies candidate fault locations using an iterative estimation of load current and fault current at each line section. Then a fault diagnosis scheme is used to first identify the fault location among multiple candidate locations using current pattern information specified by the protective device operation and comparing it to the expected one.…”

“…A.2.4.1.2 An intelligent and efficient fault location and diagnosis scheme for radial distribution systems [6] Summary: This paper proposes a fault location algorithm which identifies candidate fault locations using an iterative estimation of load current and fault current at each line section. This method is similar to the one used in a previous paper [9], but it presents a detailed method on fault diagnosis.…”

“…The microgrid protection in islanded operation poses a serious problem. It was shown in 6,7 that the fault currents for a grid-connected and islanded microgrid are significantly different. Additionally, high penetration of inverter connected distributed generation and storage sources lead to conditions where no standard overcurrent protection methods will suffice.…”

Detecção e localização de faltas em sistemas elétricos de distribuição usando abordagem inteligente baseada em análise espectral de sinais

“…Verifica-se, contudo, que conforme apresentado para a Etapa 4 do algoritmo proposto por Lee et al (2004) x converge para um valor de distância no intervalo da seção em análise, o algoritmo é finalizado, bastando somar a distância x com o valor das distâncias das seções de linha anteriores para que a localização da falta seja determinada.…”

“…No trabalho de Lee et al (2004) é também proposta uma metodologia para a identificação da lateral na qual ocorreu a falta. O método é baseado na observação Outra análise que também se configurou interessante foi à influência das componentes harmônicas da impedância fundamental.…”