Results 51 to 60 of about 247 (173)

A novel scheme for current-only directional overcurrent relay

International Journal of Electrical Power & Energy Systems, 2016
Abstract Overcurrent relays are widely used as main protection in sub-transmission and distribution systems. In mesh and multi-source networks, application of directional relay is unavoidable. Traditional directional overcurrent relays use the reference voltage phasor as the polarizing quantity to estimate the direction of the fault.
Morteza Nojavan, Heresh Seyedi, Mehdi Mehdinejad   +2 more
openaire   +1 more source

Optimal Linear Protection Scheme of Inverter‐Based Distributed Energy Resources: Meeting Fault‐Ride‐Through Requirement

International Journal of Energy Research, Volume 2026, Issue 1, 2026.
This paper presents a new two‐stage protection strategy for active distribution networks that not only addresses selectivity constraints along protected lines but also incorporates fault‐ride‐through (FRT) requirements of inverter‐based distributed energy resources (IBDERs). The proposed coordination strategy (PCS), which distinguishes it from previous
Amin Yazdaninejadi, Hossein Ebrahimi, Sajjad Golshannavaz, Zhiyi Li, Rajashik Paul   +4 more
wiley   +1 more source

Optimal Relay Coordination in Renewable Microgrids Using Multiobjective Optimization

International Transactions on Electrical Energy Systems, Volume 2026, Issue 1, 2026.
The penetration of distributed generation (DG) into distribution networks has transformed traditional protection philosophies, often resulting in protection miscoordination due to bidirectional fault currents and varying system topologies. This work presents an enhanced optimal coordination strategy for directional overcurrent relays (DOCRs) in a ...
Shahimol Basheer, K. C. Sindhu Thampatty, Wangqiang Niu   +2 more
wiley   +1 more source

Grid Fragility, Blackouts, and Control Co‐Design Solutions

Advanced Control for Applications, Volume 7, Issue 3, September 2025.
Hierarchical grid control and GRADIENTS categories. ABSTRACT The grid is undergoing a large‐scale transformation, including a significant reduction of synchronous generators, a high penetration of inverter‐based resources and renewables, substantial demand growth, new extra‐large loads, aging infrastructure and a concerning vulnerability to ...
Mario Garcia‐Sanz, Mirjana Marden, Igor Cvetkovic, HyungSeon Oh, Ethan LoCicero, Saba Khalid   +5 more
wiley   +1 more source

Artificial intelligence based optimal coordination of directional overcurrent relay in distribution systems considering vehicle to grid technology

Ain Shams Engineering Journal
Optimal coordination of overcurrent relays has become a major challenge in power distribution systems due to the increasing participation of distributed generation (DG) and electric vehicle (EV) charging stations, especially vehicle-to-grid (V2G ...
Wael Abdelfattah, Andrew Nagy, M.M. Salama, Mohamed E. Lotfy, Hosam Abdelhadi   +4 more
doaj   +1 more source

Kullback–Leibler Divergence‐Based Fault Detection Scheme for 100% Inverter Interfaced Autonomous Microgrids

Energy Science &Engineering, Volume 13, Issue 6, Page 2891-2900, June 2025.
ABSTRACT The development of a dependable and secure protection system is critical for further integration of renewable energy sources into electrical energy systems. To address the bidirectional power flow and limited fault current contribution of 100% inverter‐based microgrids, this article presents a differential fault detection scheme (DFDI) based ...
Ali Mallahi, Iman Sadeghkhani
wiley   +1 more source

An Improved Communication-Free Dual Characteristic Over Current-Based Protection Scheme for AC Microgrids

International Transactions on Electrical Energy Systems
The entry of distributed generation causes the network to become complicated, and as a result, the protection coordination between the network equipment is lost.
Hossein Mohammadi Panah, Behrooz Zaker, Haidar Samet   +2 more
doaj   +1 more source

Research on the Adaptive Protection Method for Distribution Networks With Inverter‐Type Distributed Power Supplies: Based on Short‐Circuit Impedance Calculation

Engineering Reports, Volume 7, Issue 4, April 2025.
If the linear node voltage equation set obtained from the faulty composite sequential network is solved directly by linear transformation, it is not possible to accurately calculate and obtain the fault current and the voltage at the merging point of IIDG.
Zhuoran Song, Zhanjun Li, Yongji Tong, Wenlei Dou, Hongbo Zhu, Tao Jiang   +5 more
wiley   +1 more source

Advanced voltage relay design for distance relay coordination in power networks equipped with low‐inertia areas

IET Generation, Transmission &Distribution, Volume 19, Issue 1, January/December 2025.
DR and OCR mis‐coordination challenges under the impact of DG. Abstract In modern power systems with high levels of distributed generation (DG), traditional protection schemes face challenges in ensuring reliable and efficient fault detection due to the complexities introduced by DG, particularly low‐inertia sources such as wind power.
Feras Alasali, Naser El‐Naily, Haytham Y. Mustafa, Hassen Loukil, Saad M. Saad, Abdelaziz Salah Saidi, William Holderbaum   +6 more
wiley   +1 more source

Type-2 Fuzzy C-Means-Based Clustering-Decomposed Coordination of Directional Overcurrent Relays

Energies
Optimal coordination of directional overcurrent relays (DOCRs) in medium-to-large power systems constitutes a computationally demanding, mixed-integer, nonlinear optimisation problem whose complexity escalates rapidly with system size, making the ...
Mubashar Javed, Laiq Khan, Yasir Muhammad, Saad Mekhilef, Mehdi Seyedmahmoudian   +4 more
doaj   +1 more source