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The analysis of the wind generation impact on the power system stability

Piekarz Michał

Przegląd Elektrotechniczny

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2021

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R. 97, nr 11

150--153

EN

The article discusses the issues related to the influence of connecting wind turbines on the angular stability of the power system. Current plans for Poland's energy transition, climate issues, and the most popular types of wind turbines used in the world were discussed. In the study part, the impact of replacing traditional generating units with wind turbine systems connected by converters on the angular stability of the New England test model was analysed.

PL

W artykule zostały omówione zagadnienia dotyczące wpływu przyłączania turbin wiatrowych na stabilność kątową systemu. Omówiono aktualne plany dotyczące transformacji energetycznej Polski, kwestie klimatyczne, a także najpopularniejsze rodzaje turbin wiatrowych, wykorzystywanych na świecie. W części badawczej przeanalizowano wpływ zastępowania tradycyjnych jednostek wytwórczych układami turbin wiatrowych przyłączanych przez przekształtniki na stabilność kątową modelu testowego systemu New England.

2

Application of new POSICAST control method to synchronous generator excitation system

Ghorbani H., Monadi M., Ghorbani A., Candela J. I.

Journal of Power Technologies

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2018

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Vol. 98, nr 4

336--344

EN

In this paper, modeling, analysis, design and simulation of a POSICAST controller are presented for application in a generator’s excitation system. Simple structure is the most important characteristic of this controller. The controller is a feedforward compensator; it eliminates intensive over/undershoots in system dynamic response. Since changing the reference signal in the excitation system of the synchronous generator causes oscillations in the terminal voltage, the POSICAST controller (PC) is applied at the outset of the excitation system to mitigate these oscillations. The impact of the proposed controller on the stability of the studied power system is evaluated by both eigenvalues analysis and experimental results. In order to validate the theory, the performance of the designed controller is verified in OPAL-RT by experimental approach.

3

Eigenvalue and eigenmode analysis in eddy current material testing

Wrzuszczak M., Wrzuszczak J.

Przegląd Elektrotechniczny

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2017

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R. 93, nr 9

139--141

EN

These paper presents the application of eigenvalue and eigenmode analysis in eddy current testing of conducting materials. The investigations deals with a model of eddy current sensor over the testing object. The mathematical model is defined by a Helmholtz equation and it is the fundamental model to eigenmode analysis. It can be classified as a quasi-static problem in electromagnetics. With finite element method (FEM) the eigenvalues of systems are calculated and the distribution of magnetic flux density (mode) for the eigenvalue are presented.

PL

W artykule przedstawiono zastosowanie analizy modalnej i analizy wartości własnych dla modelu przetwornika wiroprądowego umieszczonego nad badanym obiektem wykonanym z metalu lub stopu. Model matematyczny opisany równaniem Helmholtza jest modelem wyjściowym do analizy modalnej rozważanego układu „przetwornik – obiekt badań”. Wartości własne układu jak również rozkład modalny indukcji obliczono za pomocą Metody Elementów Skończonych.

4

A 16-node locking-free Mindlin plate resting on two-parameter elastic foundation – static and eigenvalue analysis

Buczkowski R., Taczała M., Kleiber M.

Computer Assisted Methods in Engineering and Science

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2015

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Vol. 22, no. 2

99--114

EN

The Pasternak elastic foundation model is employed to study the statics and natural frequencies of thick plates in the framework of the finite element method. A new 16-node Mindlin plate element of the Lagrange family and a 32-node zero-thickness interface element representing the response of the foundation are used in the analysis. The plate element avoids ill-conditioned behaviour due to its small thickness. In the case of the eigenvalue analysis, the equation of motion is derived by applying the Hamilton principle involving the variation of the kinetic and potential energy of the plate and foundation. Regarding the plate, the firstorder shear deformation theory is used. By employing the Lobatto numerical integration in which the integration points coincide with the element nodes, we obtain the diagonal form of the mass matrix of the plate. In practice, diagonal mass matrices are often employed due to their very attractive timeintegration schemes in explicit dynamic methods in which the inversion of the effective stiffness matrix as a linear combination of the damping and mass matrices is required. The numerical results of our analysis are verified using thin element based on the classical Kirchhoff theory and 16-node thick plate elements.