Results 31 to 40 of about 1,041,598 (189)

A Review of Transient Support and Security‐Stability Enhancement Control Strategies for Grid‐Forming Voltage Source Converter‐Based High Voltage Direct Current Transmission

High Voltage, EarlyView.
ABSTRACT Amid the ongoing global energy transition, the short‐circuit ratios of AC power grids are continuously decreasing. Grid‐forming voltage source converter‐based high voltage direct current transmission (GFM VSC‐HVDC) systems have therefore come to the forefront of attention.
Cheng Peng, Guangfu Tang, Yuexi Yang, Xiao Zhou, Chong Gao, Zhiyuan He, Xinying Wang, Hui Pang   +7 more
wiley   +1 more source

A Novel Protection Scheme for Solar Photovoltaic Generator Connected Networks Using Hybrid Harmony Search Algorithm-Bollinger Bands Approach

Energies, 2020
This paper introduces a new protection system for solar photovoltaic generator (SPVG)-connected networks. The system is a combination of voltage-restrained overcurrent relays (VROCRs) and directional overcurrent relays (DOCRs).
Vipul N. Rajput, Kartik S. Pandya, Junhee Hong, Zong Woo Geem   +3 more
doaj   +1 more source

Coordination of Directional Overcurrent Relays using Growth Optimizer

Electrotehnica, Electronica, Automatica
The protection system plays a crucial role in the generation, transmission, and distribution systems of a power network. Among various protection relay types, Directional Overcurrent Relays (DOCRs) are the most used. When abnormal conditions are detected, these relays trigger the tripping of protection devices by detecting the direction and magnitude ...
Ridha Djamel MOHAMMED, Miloud KADDOURI, Abdelkader BELADEL   +2 more
openaire   +1 more source

Optimal Protection Coordination of Active Distribution Networks Using Smart Selection of Short Circuit Voltage-Based Relay Characteristics

Energies, 2023
Much attention has been paid to the optimized protection of microgrids (MGs) and active distribution networks (ADNs). However, the literature shows a research gap in proposing a hybrid scheme, utilizing the voltage-based and overcurrent-based relays ...
Ali Vafadar, Maryam A. Hejazi, Hamed Hashemi-Dezaki, Negin Mohagheghi   +3 more
doaj   +1 more source

Penalty‐Based Discrete Particle Swarm Optimization for Coordinating Relays in a Brazilian 138 kV Real Power System

Vector: The Journal of Engineering, Volume 2027, Issue 1, January/December 2027.
Modelling relay coordination problem via sinusoidal, quadratic or polynomial penalty functions; metaheuristic penalty based‐discrete particle swarm optimization covering both time and instantaneous overcurrent units; dedicated program developed in C++ programming language to a real equivalent circuit.
Arthur Gomes de Souza, Wellington Maycon Santos Bernardes   +1 more
wiley   +1 more source

Optimal directional overcurrent relay coordination based on computational intelligence technique: a review

, 2021
An exponential increase in diverse load demand in the last decade has influenced the integration of more power plants into the power system. This increases the fault current due to the bidirectional flow of current, resulting in unwanted tripping of the ...
Usama, Muhammad, Mansor, Nurulafiqah Nadzirah, Pil Ramli, Suzana, Hussain, Muhamad Hatta, Mokhlis, Hazlie, Wong, Wei Ru, Muhammad, Munir Azam   +6 more
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Modified firefly algorithm for directional overcurrent relay coordination in power system protection / Muhamad Hatta Hussain [PDF]

, 2020
Nowadays, modern power systems are interconnected and protected by Directional Overcurrent Relays (DOCRs). Therefore, the protection coordination scheme poses great challenge especially in multi-source networks due to network topology and microprocessor ...
Hussain, Muhamad Hatta
core  

A Review of Overcurrent Protection in Smart Grids Under Cyber‐Physical Threats With a Cyber‐Physical Evaluation Framework

Energy Science &Engineering, Volume 14, Issue 8, Page 3948-3973, August 2026.
By manipulating current and voltage measurements, an assailant can induce unwanted relay action while attempting to avoid detection. Detecting advanced cyber intrusions in power protection environments requires specialised data analysis and anomaly detection methods.
Feras Alasali, Anas AlMajali, Naser Naily, Hassen Loukil, Salah AbuGhalyon, William Holderbaum, Abdelaziz Salah Saidi   +6 more
wiley   +1 more source

Busbar Fault Direction Identification Using Sequences of Displacement Vectors

Engineering Reports, Volume 8, Issue 2, February 2026.
In this paper, a novel busbar fault direction identification scheme is presented. The proposed scheme is based on sequences of displacement vectors. The proposed algorithm is fast and simple enough to be embedded in a differential relay to assist the percentage‐restraint differential algorithm.
Mostafa Sarlak
wiley   +1 more source

Application of tcsc to restore directional overcurrent relay coordination in systems with distributed generation [PDF]

, 2009
In this paper a new approach is proposed to mitigate the directional overcurrent relay coordination problem, which arises from connecting distributed generation ...
Mojtaba Khederzadeh
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