Results 11 to 20 of about 55,562 (265)

Short-Circuit Analysis of DER-Based Microgrids in Connected and Islanded Modes of Operation

Energies, 2021
Since microgrids should be able to smoothly operate in two distinct modes—grid-connected and islanded, their fault currents can widely fluctuate depending on the operational mode. When the microgrid is connected to the grid, the highest fault current, by
Nikola Simic, Luka Strezoski, Boris Dumnic   +2 more
doaj   +1 more source

The Influence of the Characteristics of the Medium Voltage Network on the Single Line-to-Ground Fault Current in the Resistor Grounded Neutral Networks

Designs, 2021
One important problem in the operation of medium voltage networks is the detection of a single-line-to-ground fault in its incipient state, when the fault resistance values are very high.
Dumitru Toader, Marian Greconici, Daniela Vesa, Maria Vintan, Claudiu Solea, Adrian Maghet, Ildiko Tatai   +6 more
doaj   +1 more source

Analysis of the Influence of the Insulation Parameters of Medium Voltage Electrical Networks and of the Petersen Coil on the Single-Phase-to-Ground Fault Current

Energies, 2021
Settings of protection are essential to ensure the sensitivity and selectivity needed to detect defects. Making the correct settings requires the calculation of the fault currents with as little error as possible.
Dumitru Toader, Marian Greconici, Daniela Vesa, Maria Vintan, Claudiu Solea   +4 more
doaj   +1 more source

Short-Circuit Fault Current Modeling of a DC Light Rail System with a Wayside Energy Storage Device

Energies, 2022
This paper proposes a simulation model to calculate short-circuit fault currents in a DC light rail system with a wayside energy storage device. The simulation model was built in MATLAB/Simulink using the electrical information required to define a ...
Petru Valentin Radu, Miroslaw Lewandowski, Adam Szelag, Marcin Steczek   +3 more
doaj   +1 more source

Inductive Fault Current Limiters in VSC-HVDC Systems: A Review

IEEE Access, 2020
Fast emerging fault current levels in high voltage direct current (HVDC) systems has always been a significant obstacle to building a safer and more reliable grid. Inductive fault current limiters (FCLs), compared with its resistive counterpart, are very
Hang Zhou, Jiaxin Yuan, Fan Chen, Baichao Chen   +3 more
doaj   +1 more source

Coordination Control of Power Flow Controller and Hybrid DC Circuit Breaker in MVDC Distribution Networks

Journal of Modern Power Systems and Clean Energy, 2021
The two main challenges of medium voltage direct current (MVDC) distribution network are the flexible control of power flow (PF) and fault protection. In this paper, the power flow controller (PFC) is introduced to regulate the PF and inhibit the fault ...
Jianquan Liao, Niancheng Zhou, Zian Qin, Pavel Purgat, Qianggang Wang, Pavol Bauer   +5 more
doaj   +1 more source

Fault Section Estimation in Radial LVDC Distribution System Using Wavelet Transform

Energies, 2021
The demand for low voltage DC (LVDC) distribution systems is increasing due to the rapid development of power conversion technology, the increase of DC-based digital loads, and the expansion of DC-based distributed generation (DG).
Hun-Chul Seo, Gi-Hyeon Gwon, Keon-Woo Park   +2 more
doaj   +1 more source

Emergency Loading of a Transformer in a Coordinated Substation at Different Dynamic Loading Conditions

IEEE Open Journal of Industry Applications, 2021
Utility encounters situations like when one out of two power transformers in the substation requires maintenance and only one transformer remains in operation.
A B M Shafiul Azam, William Hal Schmidt, Kellie Elford, Chris Knudstrup   +3 more
doaj   +1 more source

Magneto-Thermo-Structural Analysis of Power Transformers under Inrush and Short Circuit Conditions

Energies, 2021
The main equipment responsible for connection and transmission of electric power from generating centers to consumers are power transformers. This type of equipment is subject to various types of faults that can affect its components, in some cases also ...
Antonio Roniel Marques de Sousa, Marcus Vinicius Alves Nunes, Wellington da Silva Fonseca, Ramon Cristian Fernandes Araujo, Diorge de Souza Lima   +4 more
doaj   +1 more source

Improvement of Fault Current Calculation and Static Security Risk for Droop Control of the Inverter-Interfaced DG of Grid-Connected and Isolated Microgrids

Inventions, 2022
The contribution current of an inverter-interfaced distributed generator unit during a fault is one of the significant challenges for two modes: grid-connected and isolated AC microgrid.
Mahmoud Aref, Mahmoud A. Mossa, Ngo Kim Lan, Nguyen Vu Quynh, Vladislav Oboskalov, Alaa F. M. Ali   +5 more
doaj   +1 more source