Results 91 to 100 of about 142 (118)

Maximum-Slew-Rate Control for Hydrogenerators

Journal of Engineering for Gas Turbines and Power, 1987
Traditionally, speed control of hydrogenerators has been implemented by analog proportional-plus-integral control of speed error. With digital controllers, nonlinear, adaptive control strategies may be implemented to achieve improved systems response. This paper develops a control scheme which responds to perturbations by moving wicket gates at their ...
J. Jaeger, L. Wozniak
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Global sensitivity analysis applied to an hydrogenerator

2016 IEEE Conference on Electromagnetic Field Computation (CEFC), 2016
In this communication, a methodology based on a stochastic approach is proposed in order to characterize the effect of imperfections on the dimensions of a rotating electrical machine on on the time evolution of the signal of magnetic flux sensors. The methodology is based on an approximation of sparse polynomial chaos basis and Sobol indices to carry ...
Thu Trang Nguyen, Hung Mac, Stephane Clenet, Eilin Guillot   +3 more
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Step response of a governed hydrogenerator

Proceedings of the Institution of Electrical Engineers, 1978
Stable control of the frequency in an electrical power system is essential to ensure continuity of supply. It is determined by the combined effect of the speed governors fitted to the generating sets throughout the system. The power output response of a steam-driven set to sudden loss in generating capacity is initially fast, but, after a few seconds ...
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Hydrogenerator Monitoring

2004
U studiji se mogu se prepoznati dva karakteristična dijela, studijski i istraživački. U studijskom dijelu, koji obuhvaća 2. i 3. poglavlje, najprije se daje pregled stanja i razvoja monitoringa hidroagregata, što je temeljeno na dostupnoj literaturi te na iskustvima svjetskih i domaćih tvrtki iz tog područja.
Rajković, Borivoje, Meško, Boris, Jadrić, Martin, Terzić, Božo, Orešković, Goran, Despalatović, Marin, Firinger, Vladimir   +6 more
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INTENSIFICATION OF THE AEG HYDROGENERATOR COOLING

Scientific research of the SCO countries: synergy and integration
The hydrogenerator cooling system of Nuojua HPP in Finland has been intensified in order to reduce ventilation losses and increase efficiency. This was achieved through several measures, including the closure of the space between rotor spiders with separating steel shields, and changes to the stator core ventilation ducts and air flow pattern in the ...
Verkhovtsev, D.A., Shubina, E.A., Gulay, S.L., Liamin, A.A.   +3 more
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Solution to Increase the Hydrogenerator Mean Power

Waterpower '99, 1999
The paper aims to find a new solution for the power hydrogenerators (66 MVA) cooling, in the view of the increase of the power in the power system. This solution proposes the use of thermal tubes when accomplishing the cooler. By applying this method there is aimed the increase of the operating current of the hydrogenerators from 2420 A, (66 % of the ...
Marian Duta, Petre Tiriplica
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Efficiency based optimal control of Kaplan hydrogenerators

IEEE Transactions on Energy Conversion, 1995
This paper investigates an optimal strategy for controlling the speed response of Kaplan hydrogenerating systems to decreases in load. Typically, primary control gates restrict and redirect water through the turbine to stabilize and transfer the system to operating point demand.
P. Schniter, L. Wozniak
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Vibrations measurement during hydrogenerator testing

2003
This paper presents the results of vibration measurement during several specific tests of 35 MVA hydro-generator. The extended testing of hydro-generator (rated 35 MVA) was made because the generators working age expired and was going to be replaced with new one. This was the perfect opportunity to do some specific and not usual testing. The results of
Vražić, Mario, Maljković, Zlatko, Gašparac, Ivan   +2 more
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Optimal PID Gain Schedule for Hydrogenerators-Design and Application

IEEE Power Engineering Review, 1989
The development and testing of a digital gain switching governor for hydrogenerators are described. Optimal gains are found at different load points by minimizing a quadratic performance criterion prior to controller operation. During operation, the gain sets are switched in depending on gate position and speed error magnitude.
G. Orelind, L. Wozniak, J. Medanic, T. Whittemore   +3 more
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Overview of hydrogenerator stator winding monitoring

IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272), 2003
Stator winding failure due to insulation system deterioration is an important cause of hydrogenerator forced outages. Furthermore, if the deterioration is not found at an early stage, premature stator rewinding may be required, at a cost that far exceeds the cost of many maintenance procedures, such as rewedging and cleaning.
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