Autor: Dettmann, K. D. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Wind turbine harmonics caused by unbalanced grid currents
Autorzy:: Dettmann, K. D.
Schostan, S.
Schulz, D.
Powiązania:: https://bibliotekanauki.pl/articles/262590.pdf
Data publikacji:: 2007
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:: AC machines
circuit analysis
current measurement
harmonic analysis
harmonic distortion
power system harmonics
power system measurements
sequences
wind energy
wind power generation
Opis:: For wind turbines that feed into public grids limits for voltage and current harmonics must be assured. To verify that the actual levels are valid, measurements are necessary. Problems can occur to determine which part of these harmonics has its origin in the wind turbine. It is shown that also harmonics which originally have zero sequences can be transferred over a delta-star-transformer, if the currents of the wind turbine are asymmetric due to unbalanced loads. Measurements in an existing wind turbine configuration are discussed, which confirm the described effects.
Źródło:: Electrical Power Quality and Utilisation. Journal; 2007, 13, 2; 17-23
1896-4672
Pojawia się w:: Electrical Power Quality and Utilisation. Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Adaptive modeling of reliability properties for control and supervision purposes
Autorzy:: Dettmann, K. U.
Söffker, D.
Powiązania:: https://bibliotekanauki.pl/articles/907535.pdf
Data publikacji:: 2011
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: niezawodność
estymacja parametrów
kumulacja uszkodzeń
reliability
parameter estimation
damage accumulation
probabilistic simulation
Opis:: Modeling of reliability characteristics typically assumes that components and systems fail if a certain individual damage level is exceeded. Every (mechanical) system damage increases irreversibly due to employed loading and (mechanical) stress, respectively. The main issue of damage estimation is adequate determination of the actual state-of-damage. Several mathematical modeling approaches are known in the literature, focusing on the task of how loading effects damage progression (e.g., Wöhler, 1870) for wear processes. Those models are only valid for specific loading conditions, a priori assumptions, set points, etc. This contribution proposes a general model, covering adequately the deterioration of a set of comparable systems under comparable loading. The main goal of this contribution is to derive the loading-damage connection directly from observation without assuming any damage models at the outset. Moreover, the connection is not investigated in detail (e.g., to examine the changes in material, etc.) but only approximated with a probabilistic approach. The idea is subdivided into two phases: A problem-specific relation between loading applied (to a structure, which contributes to the stress) and failure is derived from simulation, where a probabilistic approach only assumes a distribution function. Subsequently, an adequate general model is set up to describe deterioration progression. The scheme will be shown through simulation-based results and can be used for estimation of the remaining useful life and predictive maintenance/control.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2011, 21, 3; 479-486
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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