Temat: harmonic analysis - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Harmonic domain modelling of transformer core nonlinearities using the DIgSILENT powerfactory software
Autorzy:: Wiechowski, W.
Bak-Jensen, B.
Bak, C. L.
Lykkegaard, J.
Powiązania:: https://bibliotekanauki.pl/articles/262821.pdf
Data publikacji:: 2008
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:: autotransformers
harmonic analysis
nonlinearities
simulation software
transformer cores
Opis:: This paper demonstrates the results of implementation and verification of an already existing algorithm that allows for calculating saturation characteristics of singlephase power transformers. The algorithm was described for the first time in 1993. Now this algorithm has been implemented using the DIgSILENT Programming Language (DPL) as an external script in the harmonic domain calculations of a power system analysis tool PowerFactory [10]. The algorithm is verified by harmonic measurements on a single-phase power transformer. A theoretical analysis of the core nonlinearities phenomena in single and three-phase transformers is also presented. This analysis leads to the conclusion that the method can be applied for modelling nonlinearities of three-phase autotransformers.
Źródło:: Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 3-11
1896-4672
Pojawia się w:: Electrical Power Quality and Utilisation. Journal
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Circuit for Balancing Harmonic-Polluted Three-Phase Networks
Autorzy:: Saied, M. M.
Powiązania:: https://bibliotekanauki.pl/articles/262835.pdf
Data publikacji:: 2013
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:: harmonic analysis
power quality
load balancing
frequency scan
Steinmetz circuit
Opis:: This paper presents a new circuit capable of balancing harmonics-polluted three-phase power networks supplying single-phase loads. It takes into account the negative and positive sequences exhibited by the fifth and seventh harmonics, respectively. The concept extends the relations of the Steinmetz circuit, which are based exclusively on fundamental frequency considerations. The Steinmetz circuit does not, therefore, guarantee the balancing of the different harmonics in the line currents. Furthermore, it can lead to resonances between the capacitive and inductive elements in the two added balancing branches. A procedure for identifying the topology and the circuit parameters of the proposed connection is given. The results of a detailed case study are presented in order to demonstrate the superiority of the proposed circuit over the conventional Steinmetz connection.
Źródło:: Electrical Power Quality and Utilisation. Journal; 2013, 16, 1; 19-24
1896-4672
Pojawia się w:: Electrical Power Quality and Utilisation. Journal
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

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

Artykuł

Informacja