DSpace Komunita:http://hdl.handle.net/11025/114382024-02-29T04:33:38Z2024-02-29T04:33:38ZPower processes quality estimation and compensation for poor quality in low-voltage electric networksZagirnyak, MykhayloPrus, V. V.Nikitina, A. V.http://hdl.handle.net/11025/115422020-07-02T08:47:19Z2013-01-01T00:00:00ZNázev: Power processes quality estimation and compensation for poor quality in low-voltage electric networks
Autoři: Zagirnyak, Mykhaylo; Prus, V. V.; Nikitina, A. V.
Abstrakt: A method of power processes quality estimation
and compensation for poor quality in industrial low-voltage
electric networks is substantiated. Calculation relations for
spectral presentation of power components and quality factors
of electric power are improved in accordance with p-q-r-theory
of instantaneous power. The structure of compensating device
is grounded and a higher efficiency of nonlinear distortions
compensation compared with the basic variant of p-q-r-theory
is confirmed.2013-01-01T00:00:00ZZagirnyak, MykhayloPrus, V. V.Nikitina, A. V.Combinatorial method for optimal sizing and placement of active power filtersLewandowski, MichałWalczak, Januszhttp://hdl.handle.net/11025/115412020-07-02T08:47:21Z2013-01-01T00:00:00ZNázev: Combinatorial method for optimal sizing and placement of active power filters
Autoři: Lewandowski, Michał; Walczak, Janusz
Abstrakt: Combinatorial method for optimal sizing and
placement of active power filters (APFs) has been presented in
the paper. The main idea is to separate the sizing and
placement parts of the algorithm to avoid calling the cost
function during the APF sizing part of the algorithm, what
allows to overcome some problems associated with nonlinearity
and discontinuity of the APF cost function. The results confirm
a high effectiveness of the method in comparison with the
traditional approach. The main disadvantage of the method is
a relatively large amount of computation caused by the
combinatorial testing of all possible APF connection nodes.2013-01-01T00:00:00ZLewandowski, MichałWalczak, JanuszSolution of Skin-Effect Problems by means of the Hybrid SDBCI MethodAiello, G.Alfonzetti, S.Salerno, N.http://hdl.handle.net/11025/115402020-07-02T08:47:24Z2013-01-01T00:00:00ZNázev: Solution of Skin-Effect Problems by means of the Hybrid SDBCI Method
Autoři: Aiello, G.; Alfonzetti, S.; Salerno, N.
Abstrakt: This paper presents a singular version of the
hybrid FEM-DBCI method to solve skin effect problems in open
boundary domains. This version consists of overlapping the
fictitious truncation boundary with the integration one, as in the
FEM-BEM method.2013-01-01T00:00:00ZAiello, G.Alfonzetti, S.Salerno, N.Resistance of thin disks and ringsSzymanik, BarbaraGratkowski, Stanisławhttp://hdl.handle.net/11025/115392020-07-02T08:47:24Z2013-01-01T00:00:00ZNázev: Resistance of thin disks and rings
Autoři: Szymanik, Barbara; Gratkowski, Stanisław
Abstrakt: In this paper the following, classic problem [1] is taken into consideration: calculate the resistance between two, perfectly conducting contacts on the rim of a thin disk (t << a, where a indicates disk’s radius and t is its thickness) of conductivity σ. An example of a simple, approximate solution to above problem can be found in [2], however, it requires contacts to be sufficiently small (i.e. d >> δ, where δ is the contacts’ size and d indicates the distance between them). Our purpose was to find more general solution, valid for contacts of finite size. Moreover, we propose the extension of above problem to thin rings. The exact analytical method of solving the Laplace equation to find the scalar potential was used. Afterwards, the Ohm law to obtain the formulas for disks and rings resistance was utilized. Using the dilogarithm function we obtained simplified, approximate formulas for the disks and rings resistance.2013-01-01T00:00:00ZSzymanik, BarbaraGratkowski, Stanisław