A Current-based Differential Technique to Detect Loss of Field in Synchronous Generators

Abbas Hasani, Farhad Haghjoo, Filipe Miguel Faria da Silva, Claus Leth Bak

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A new approach for generator loss of field (LOF) protection is proposed by estimating the field current based on the generator measurable parameters. The main idea of the proposed approach is that a significant difference will be created between the measured excitation and the estimated field currents during LOF occurrence. A differential index is introduced to monitor such difference and consequently to detect LOF failures. A detailed and realistic field circuit is considered for the generator by using the phase domain model of the generator in the real-time-digital-simulator; while different types of LOF events can be simulated through such model, as well. The obtained results show that the presented technique can detect various types of LOF events much faster than the conventional impedance-based scheme. Moreover, it exhibits more security than the conventional technique in the face of power system disturbances (e.g. stable power swing and out of step conditions).
Original languageEnglish
JournalI E E E Transactions on Power Delivery
Pages (from-to)1-9
Number of pages9
ISSN0885-8977
Publication statusE-pub ahead of print - 2020

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Synchronous generators
Simulators
Networks (circuits)

Keywords

  • Synchronous generator
  • Loss of field detection
  • Real-time-digital-simulator
  • Stable power swing
  • Out of step

Cite this

@article{75617871b2ed4fcbafe0829178e57568,
title = "A Current-based Differential Technique to Detect Loss of Field in Synchronous Generators",
abstract = "A new approach for generator loss of field (LOF) protection is proposed by estimating the field current based on the generator measurable parameters. The main idea of the proposed approach is that a significant difference will be created between the measured excitation and the estimated field currents during LOF occurrence. A differential index is introduced to monitor such difference and consequently to detect LOF failures. A detailed and realistic field circuit is considered for the generator by using the phase domain model of the generator in the real-time-digital-simulator; while different types of LOF events can be simulated through such model, as well. The obtained results show that the presented technique can detect various types of LOF events much faster than the conventional impedance-based scheme. Moreover, it exhibits more security than the conventional technique in the face of power system disturbances (e.g. stable power swing and out of step conditions).",
keywords = "Synchronous generator, Loss of field detection, Real-time-digital-simulator, Stable power swing, Out of step",
author = "Abbas Hasani and Farhad Haghjoo and Silva, {Filipe Miguel Faria da} and Bak, {Claus Leth}",
year = "2020",
language = "English",
pages = "1--9",
journal = "I E E E Transactions on Power Delivery",
issn = "0885-8977",
publisher = "IEEE",

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A Current-based Differential Technique to Detect Loss of Field in Synchronous Generators. / Hasani, Abbas ; Haghjoo, Farhad; Silva, Filipe Miguel Faria da; Bak, Claus Leth.

In: I E E E Transactions on Power Delivery, 2020, p. 1-9.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - A Current-based Differential Technique to Detect Loss of Field in Synchronous Generators

AU - Hasani, Abbas

AU - Haghjoo, Farhad

AU - Silva, Filipe Miguel Faria da

AU - Bak, Claus Leth

PY - 2020

Y1 - 2020

N2 - A new approach for generator loss of field (LOF) protection is proposed by estimating the field current based on the generator measurable parameters. The main idea of the proposed approach is that a significant difference will be created between the measured excitation and the estimated field currents during LOF occurrence. A differential index is introduced to monitor such difference and consequently to detect LOF failures. A detailed and realistic field circuit is considered for the generator by using the phase domain model of the generator in the real-time-digital-simulator; while different types of LOF events can be simulated through such model, as well. The obtained results show that the presented technique can detect various types of LOF events much faster than the conventional impedance-based scheme. Moreover, it exhibits more security than the conventional technique in the face of power system disturbances (e.g. stable power swing and out of step conditions).

AB - A new approach for generator loss of field (LOF) protection is proposed by estimating the field current based on the generator measurable parameters. The main idea of the proposed approach is that a significant difference will be created between the measured excitation and the estimated field currents during LOF occurrence. A differential index is introduced to monitor such difference and consequently to detect LOF failures. A detailed and realistic field circuit is considered for the generator by using the phase domain model of the generator in the real-time-digital-simulator; while different types of LOF events can be simulated through such model, as well. The obtained results show that the presented technique can detect various types of LOF events much faster than the conventional impedance-based scheme. Moreover, it exhibits more security than the conventional technique in the face of power system disturbances (e.g. stable power swing and out of step conditions).

KW - Synchronous generator

KW - Loss of field detection

KW - Real-time-digital-simulator

KW - Stable power swing

KW - Out of step

M3 - Journal article

SP - 1

EP - 9

JO - I E E E Transactions on Power Delivery

JF - I E E E Transactions on Power Delivery

SN - 0885-8977

ER -