Spelling suggestions: "subject:"[een] EXCITATION SYSTEMS"" "subject:"[enn] EXCITATION SYSTEMS""
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Excitation control of synchronous generators in electrical power systems : design using pole-placement and Inverse Nyquist Array techniques / Peter Kenneth MuttikMuttik, Peter Kenneth January 1979 (has links)
xiii, 370 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Electrical Engineering, 1980
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A microprocessor based excitation system simulator /Cunha-Gomes, Keith January 1983 (has links)
No description available.
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A microprocessor based excitation system simulator /Cunha-Gomes, Keith January 1983 (has links)
No description available.
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Fast-response rotating brushless exciters for improved stability of synchronous generatorsNøland, Jonas Kristiansen January 2016 (has links)
The Norwegian Network Code FIKS from the Norwegian Transmission System Operator (TSO) Statnett, states that synchronous generators ≥ 25 MVA must have a static excitation system. It also includes requirements on the step time response and the available field winding ceiling voltage of the excitation system. An improved brushless excitation system is in operation in some pilot power plants. A rotating thyristor bridge is controlled via Bluetooth. The step time response is as fast as conventional static excitation systems. However, a ceiling voltage factor of 2 requires the thyristor bridge to operate at firing angles about 60 degrees. High torque pulsations, low power factor and low utilization of the exciter is the end result. New power electronic interfaces on the shaft results in a betterutilization of the designed exciter and improves the mechanical performance as well as the controllability of the generator field winding. Permanent magnet rotating exciters increase the field forcing strength of the synchronous generator, yielding improved transient stability (Fault Ride-Through req.). Brushless exciters also reduces regular maintenance of the generator. The thesis includes experiments on a state of the art synchronous generator test setup including constructed PM exciter and different power electronic solutions. Some investigations has been done on industrial power plants as well.
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[en] ANALYSIS AND DESIGN OF STATIC EXCITERS / [pt] ANÁLISE E PROJETO DE EXCITATRIZES ESTÁTICASJORGE LUIZ DE ARAUJO JARDIM 23 January 2007 (has links)
[pt] Os sistemas de potência são projetados para operarem com
tensão e freqüência constantes, admitindo-se pequenas
variações em torno de sues valores nominais. Estas
grandezas são controladas principalmente pelos sistemas de
excitação e reguladores de velocidade, respectivamente.
Esta dissertação examina o projeto de sistemas de
excitação modernos e estabelece as características de
projeto dos componentes das excitatrizes estáticas. Os
principais componentes (conversor, circuito de disparo,
circuito de partida e regulador de tensão) são
implementados em um protótipo de excitatriz.
As respostas do protótipo à pequenas e grandes
perturbações também são discutidas. / [en] Power systems are designed to operate with constant
voltagem and frequency, allowing small sinal variations
around its rated valves. These quantities are mainly
controlled by excitation systems and governors,
respectively.
This dissertation examines the design of modern excitation
systems and estabilishes the desired characteristics of
static exciter componentes. The main components
(conversor, firing circuit, starting circuit and voltage
regulator) are implemented in a exciter prototype.
The prototype response to small and larger disturbances
are also discussed.
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Response of a parametrically-excited system to a nonstationary excitationNeal, Harold Lewis 11 May 2010 (has links)
The response of a parametrically-excited system to a deterministic nonstationary excitation is studied. The system, which has a cubic nonlinearity, has one focus and two saddle points and can be used as a simple model of a ship in the head or follower seas. The method of multiple scales is applied to the governing equation to derive equations for the amplitude and phase of the response. These equations are used to find the stationary response of the system to stationary excitation. The stability of the stationary response is examined. The stability of stationary periodic solutions to the original governing equation is examined through a Floquet analysis. The response to a nonstationary excitation having (a) a frequency that varies linearly with time, or (b) an amplitude that varies linearly with time, is studied. The response is computed from digital computer integration of the equations found from the method of multiple scales and of the original governing equation. The response to nonstationary excitation has several unique characteristics, including penetration, jump-up, oscillation, and convergence to the stationary solution. The agreement between solutions found from the original governing equation and the method-of-multiple-scales equations is good. For some sweeps of the excitation frequency or amplitude, the response to nonstationary excitation found from the original governing equation exhibits behavior which is analogous to symmetry-breaking bifurcations, period-doubling bifurcations, chaos, and unboundedness in the stationary solution. The maximum response amplitude and the excitation frequency or amplitude at which the response goes unbounded is found as a function of sweep rate. The effect of initial conditions and noise on the response to nonstationary excitation is considered. The results of the digital-computer simulations are verified with an analog computer. / Master of Science
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Dynamic simulation of solid state controlled machine systems including component failuresMcHale, Timothy Luke January 1983 (has links)
A modeling approach suitable for simulating solid-state-controlled machine systems, including component failures within either the electronics or machine(s), is presented in detail. The capability of modeling unbalanced-machine operation is included in the modeling approach. The approach is directly amenable to computer implementation. Computer implementation of the modeling approach was performed and the simulated results were compared with actual oscillograms, obtained from the performance tests of an Electric Vehicle Propulsion Unit, in order to verify the proposed modeling approach. Excellent correlation between the simulated waveforms and the oscillograms existed in all the simulated cases. The modeling approach was used also to simulate the electrical behavior of a brushless-excitation system used for large turbine generators. The simulations consisted of normal steady-state operation as well as a scenario of fault conditions occurring within the rotating rectifier assembly of the brushless exciter. The simulated results are displayed and a discussion of intrinsic features of these results needed to identify the specific fault is presented. Fault detection schemes are warranted for such expensive systems. Actual voltage and/or current waveforms could be telemetered to an controller for fault detection and classification.
The elements of this modeling approach which allow inexpensive computer simulation of such systems, that can contain nonlinearities and/or spontaneous faults in any of its components, are listed as follows:
1. The capability of automatically generating the systems' governing state equations, from a minimal set of topological data and component values, at any point within the simulation run;
2. Inclusion of unbalanced machine operation is a result of having no topological restrictions placed upon the mutual coupling.
3. Using piece-wise linear I-V characteristics of the solid-state switching components decreases the computation time needed for a given simulation run since iteration for the status of the equivalent resistance values for each switch is only required at their threshold (I-V) points.
4. Employment of an implicit (predictor-corrector) integration algorithm designed specifically for solving stiff differential equations, typically associated with solid-state controlled machine systems, allows realistic modeling of the solid-state switches' equivalent resistance values. Also, implicit algorithms (like the one employed in this work) result in a drastic reduction of computer execution time and an increase in accuracy, when compared to explicit algorithms, systems. for simulating these types of stiff systems. / Ph. D.
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Modeling of modern excitation control systemsOrta, Conrado. January 1980 (has links)
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 1980 / Includes bibliographical references. / by Conrado Orta, Jr. / M.S. / M.S. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
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Microcomputer control of excitation of a synchronous machineLo, Kin-chung, 盧健翀 January 1981 (has links)
published_or_final_version / Electrical Engineering / Master / Master of Philosophy
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The nature of torsional interactions in synchronous generators /Joós, Géza. January 1986 (has links)
No description available.
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