Results 81 to 90 of about 1,446,171 (254)

Caenogastropods and heterobranch gastropods from the Hettangian deposits of Luxembourg: palaeobiogeography and Early Jurassic faunal recovery in the western Tethys

Papers in Palaeontology, Volume 12, Issue 1, January/February 2026.
Abstract We describe the Hettangian Caenogastropoda and Heterobranchia of the Luxembourg Sandstone Formation, a wedge of clastic sediments deposited along the eastern margin of Paris Basin during the Early Jurassic. Five new genera and 11 new species are erected: Bourguetia bipartita sp. nov., Globularia delsatei sp. nov., Oonia feidtorum sp.
Stefano Monari, Roberto Gatto, Mara Valentini, Robert Weis   +3 more
wiley   +1 more source

Performance Analysis of a Single-Diode Photovoltaic Model Based on a Thevenin’s Equivalent Circuit

Journal of Engineering and Sustainable Development
This article proposes a linear Thevenin's equivalent circuit for a single-diode model. The Thevenin's equivalent circuit is derived based on the piecewise linearization for the nonlinear characteristic of the diode.
Ammar AL-GIZI, Abbas Hussien Miry, Hussein M. Hathal, Aurelian Craciunescu   +3 more
doaj   +1 more source

Identifying Oscillation‐Vulnerable Buses Using Impedance‐Based Reflection Coefficient

Electronics Letters, Volume 62, Issue 1, January/December 2026.
We propose a method to identify oscillation‐vulnerable buses by applying the Barkhausen criterion to an impedance‐based reflection‐coefficient analysis in power systems. The method computes the reflection‐coefficient magnitude and phase from the Thevenin impedance seen from each bus and the corresponding load impedance, and evaluates phase variations ...
Taewan Choi, Hyun‐Keun Ku, Jaehyeong Lee, Dongho Lee   +3 more
wiley   +1 more source

Real‐Time Active Power Control Method Considering Voltage Security Constraints and Effective Regulation Space of Multitype Resources

IET Energy Systems Integration, Volume 8, Issue 1, January/December 2026.
ABSTRACT Renewable energy bases in Desert‐Gobi‐Wasteland (DGW) areas connected with high‐voltage direct current (HVDC) transmission systems show notable weak‐grid features, including low inertia, weak damping and a low short‐circuit ratio. This results in strong active power–voltage (P–V) coupling effects, making existing real‐time active power control
Guoqing Li, Heyang Sun, Shouqi Jiang, Yechun Xin, Jian Lou   +4 more
wiley   +1 more source

Voltage Stability Index Using New Single-Port Equivalent Based on Component Peculiarity and Sensitivity Persistence

, 2021
A voltage stability index is proposed using a new single-port equivalent depending on component peculiarity representation and sensitivity persistence to locate and determine long-term voltage instability in transmission and distribution power networks ...
Muhammad Shoaib Bhutta, Umer Farooq, Larisa Ivascu, Ghulam Rasool, Jamshed Ali Shaikh, Hui Li, Muddassar Sarfraz, Zain ul Abidin Jaffri, Muhammad Shahzad Nazir   +8 more
core   +1 more source

Analytical Models Synthesis of Power Electronic Converters

Transactions on Environment and Electrical Engineering, 2017
In this paper we proposes a synthesis of different mathematical models of power electronic converters based on Thevenin/Norton equivalent circuits. Those models, composed by impedances and harmonic noise sources, are helpful to predict the conducted ...
Achour Ales, Jean-Luc Schanen, Djelloul Moussaoui, James Roudet   +3 more
doaj   +1 more source

Ferromagnetically Shielded Fault Current Limiter (FS‐FCL) Evaluation in Power Line

IET Generation, Transmission &Distribution, Volume 20, Issue 1, January/December 2026.
This study introduces a new ferromagnetically shielded FS‐FCL design and its control strategy for limiting and interrupting fault currents. The fully shielded core structure enhances inductance and prevents saturation, enabling an immediate fault response without causing voltage drop during normal conditions.
Kamran Ghorbanyan, Selim Acar
wiley   +1 more source

Synchrophasor based method for computing the Thevenin equivalent impedance seen by a concentrated wind farm region

, 2010
textTransmission line reactance is an important parameter in carrying out stability studies. The model proposed here utilizes available real time synchrophasor data and information about the generation in the ERCOT grid to determine the Thevenin ...
Kowley, Puja Ajay
core  

Stability and Synchronization of MMC‐HVDC Systems Using SRF and Inertia‐Based PLLs

IET Generation, Transmission &Distribution, Volume 20, Issue 1, January/December 2026.
This study investigates the influence of synchronous reference frame PLL (SRF‐PLL) and the inertia PLL (IPLL) on the stability of grid‐connected modular multilevel converter high voltage direct current (MMC‐HVDC) systems. The findings highlight intrinsic stability limitations of PLL‐based systems, offering insights toward more stable, PLL‐less ...
Shuai Wang, Robin Preece, Mike Barnes
wiley   +1 more source

Power Transmission Limits Assessment on PCC of Grid-connected Wind Power Based on Nodal Electromagnetic Transient Thevenin Equivalence

Taiyuan Ligong Daxue xuebao
Purposes Transmission power limit exists in point of common coupling (PCC) of grid-connected wind power, when the transmission power exceeds the limit, it may lead to voltage instability and broadband oscillation problems, threatening the safety and ...
GUO Xiaolong, KANG Pengpeng, SONG Pengfei, CHEN Wuhui, KANG Jiale   +4 more
doaj   +1 more source