Results 11 to 20 of about 1,744 (183)

Localization of Partial Discharges in Hydrogenerators by Ozone Emission

Energies
We suggest a new method of localization of partial discharges in high-power electrical systems. Ozone in a hydrogenerator is produced by chemical reactions induced by partial discharges in the stator region.
Victor Dmitriev, Rodrigo M. S. de Oliveira, Licinius D. S. de Alcantara, Gustavo G. Girotto   +3 more
doaj   +2 more sources

Estimation of hydrogenerator rotor dynamic thermal margine [PDF]

Zbornik Radova: Elektrotehnički Institut "Nikola Tesla", 2022
Field winding temperature of the synchronous generator is one of limiting factors shaping generator PQ capability curve. Therefore of great operational importance is to have information about this temperature estimated with the utmost accuracy. It can be
Klasnić Ilija, Belonić Dragan, Janda Žarko, Dragosavac Jasna, Ćirić Zoran   +4 more
doaj   +2 more sources

Loss Modeling of Large Hydrogenerators for Cost Estimation of Reactive Power Services and Identification of Optimal Operation [PDF]

IEEE transactions on energy conversion, 2022
As a result of the worldwide energy transition, reactive power generation has started to become a more scarce resource in the power grid. Until recently, reactive power has been an auxiliary grid service that classical power generation facilities have ...
Karekezi, Yannick Cyiza, Melfald, Emil Ghieh, Nøland, Jonas Kristiansen, Øyvang, Thomas   +3 more
core   +2 more sources

Experimental Estimation of Journal Bearing Stiffness for Damage Detection in Large Hydrogenerators

Shock and Vibration, 2017
Based on experimental pieces of evidence collected in a set of twenty healthy large hydrogenerators, this article shows that the operating conditions of the tilting pad journal bearings of these machines may have unpredictable and significant changes ...
Geraldo Carvalho Brito, Roberto Dalledone Machado, Anselmo Chaves Neto   +2 more
doaj   +2 more sources

Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators

International Journal of Rotating Machinery, 2017
Based on experimental observations on a set of twenty 700 MW hydrogenerators, compiled from several technical reports issued over the last three decades and collected from the reprocessing of the vibration signals recorded during the last commissioning ...
Geraldo Carvalho Brito Junior, Roberto Dalledone Machado, Anselmo Chaves Neto, Mateus Feiertag Martini   +3 more
doaj   +2 more sources

Transient Roebel Bar Force Calculation in Large Salient-Pole Synchronous Machines

IEEE Access, 2021
The radial and tangential force components acting on each sub-conductor of a Roebel bar in a large generator lead to mechanical vibration of the stator bars in the slot.
Marius Wenzel Meiswinkel, Amir Ebrahimi, Constantin Wohlers, Tim Neschitsch   +3 more
doaj   +1 more source

The Methods of Three-Dimensional Modeling of the Hydrogenerator Thrust Bearing

Computation, 2022
In the presented scientific work, the basic design versions of the thrust bearings of Hydrogenerators are considered. The main causes of emergencies in the thrust bearing unit of a high-power Hydrogenerator are considered.
Oleksii Tretiak, Dmitriy Kritskiy, Igor Kobzar, Mariia Arefieva, Viacheslav Nazarenko   +4 more
doaj   +1 more source

Study on the suppression effect of variable hydrogen parameters on the temperature rise of the turbo‐generator rotor under deep peak regulation

IET Electric Power Applications, Volume 17, Issue 12, Page 1524-1534, December 2023., 2023
The temperature characteristics of gap‐pickup diagonal‐flow turbo‐generator rotor is obtained, and the suppression law of hydrogen temperature and pressure on rotor temperature is summarised. Abstract In recent years, the extensive participation of turbine generator in deep peak regulation has caused significant damage to the rotor windings, which is ...
Yucai Wu, Yingjie Guo
wiley   +1 more source

Synchronization and Optimal Operation of a 140 kVA Inverter in On‐Grid Mode Using Mamdani Controllers in Cascade

Journal of Electrical and Computer Engineering, Volume 2023, Issue 1, 2023., 2023
This paper addresses the synchronization and operation of a 140 kVA inverter system connected to the main grid as part of a decentralized microgeneration system. The considerations for the supply of electrical energy stored in battery banks, mostly of photovoltaic origin, involve a study of the details of a rigid nonlinear system, which parallels the ...
Jesús Rodríguez-Flores, Victor Herrera-Perez, Javier Gavilanes, Andrés Morocho, Jorge Hernandez-Ambato, Ton D. Do   +5 more
wiley   +1 more source

Research on Multiobjective Optimal Operation Strategy for Wind‐Photovoltaic‐Hydro Complementary Power System

International Journal of Photoenergy, Volume 2022, Issue 1, 2022., 2022
To address the problems of wind and solar generation volatility and lose of wind and photovoltaic resources, on the basis of the complementary property of wind‐solar‐water, the topology structure of the wind‐solar‐water synergy power generation system is constructed. Taking the minimum grid fluctuation index, the minimum wind‐photovoltaic‐hydro discard
Guo Zhao, Chenxi Wan, Wanqing Zuo, Kefei Zhang, Xinyi Shu, Daniel T. Cotfas   +5 more
wiley   +1 more source