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1
Content available Approximation and Prediction of the Wind Speed Change Function
Klen K., Zhuikov V.
Present Problems of Power System Control
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2018
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Nr 9
35--46
EN
In the article the features of energy summation from two wind generators, located at a certain distance from each other, are considered. The method of calculating the correlation function between the wind flow speed change functions in the direction of wind distribution is presented. The formulas for describing the fluctuation components of energy at the output of the wind generator are given for two cases: when the phases of the fluctuations of the wind flow on two wind generators are the same and when the fluctuations of the wind flow are in the antiphases. It is shown that to increase the energy level that can be taken from the wind power plant it is necessary to control the phase shift between the energy fluctuations at the output of the wind generators and use the energy of the storages; and to use linear approximations to approximate the wind speed change function. Under the condition of a linear change of the internal resistance of the wind generator in time, it is advisable to introduce the wind speed change function with linear approximations. The system of orthonormal linear functions based on Walsh functions is given. A table with formulas and graphs describing the first 8 functions, which are arranged in order of increasing the number of their sign alternating on the interval of functions definition, is presented. The result of the approximation of the wind speed change function with a system of 8 linear functions based on Walsh functions is shown. Decomposition coefficients, mean-square and average relative approximation errors for such approximation are calculated. In order to find the parameters of multiple linear regression the method of least squares is applied. The regression equation in matrix form is given. An example of application of linear regression prediction method to simple functions is shown. The restoration result for wind speed change function is shown. Decomposition coefficients, mean-square and average relative approximation errors for restoration of wind speed change function with linear regression method are calculated.
2
Content available Mechanical properties of composite scaffolds from poly(3-hydroxybutyrate) and sodium alginate
Bonartsev A., Zhuikov V., Zharkova I., Akoulina E., Voinova V., Bonartseva G., Shaitan K.
Engineering of Biomaterials
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2017
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Vol. 20, no. 143 spec. iss.
89
3
Content available Static And Dynamic Tariffing Electric Power Autonomous Microgrid
Zhuikov V., Yamnenko J., Tereschenko T., Klepach L., Boiko I.
Present Problems of Power System Control
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2016
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Nr 7
29--41
EN
The paper presents a static model of the price calculation for the various alternative electricity sources, and includes technical and economic performance of different energy sources for the guaranteed power. The table with calculated technical and economic indicators for various alternative energy sources is provided. The presented dynamic model which unites energy indicators of power generating systems and economic indicators of the closed macroeconomic system because price regulation on the power market of Ukraine happens in a statics. That’s why not allowed to perform an assessment of dynamic change of the tariff price of the electric power in the local isolated systems. When abrupt change isolated power generating capacity of the system is changing the tariff price of electricity cannot be taken into account when using static models. An example of the isolated system consisting of the diesel generator and the consumer is reviewed. The model allows to research influence of transition processes of the generator on change of cost indicators of an economic system, and also to estimate the adequate tariff price both for the producer, and for consumers of the electric power. This model is modelled in Matlab.
4
Content available Chaotic Processes In PWM Converter
Zhuikov V., Matiiko A.
Present Problems of Power System Control
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2016
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Nr 7
43--51
EN
The possibility of chaotic oscillations in them is determined. The structure of the chaotic oscillations in the DC converter is considered. The system stability at various gain values of the feedback signal is investigated. The task is building a precision DC buck converter. The goal is achieved by means of providing high feedback signal gain converter operation mode. The work of the converter is commended in a case of: a) changing the input voltage; b) changing the value of the load resistance. It is shown that while ensuring the appropriate converter operation mode it is possible to improve stabilising properties and reduce the system operation frequency.
5
Content available remote Determining of the transformer operating modes by means of vibroacoustic signals
Kuznietsov N., Zhuikov V.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 4
287-289
EN
The paper presents the mathematical relations for determining the transformer operation mode using vibroacoustic signals analysis.
PL
W artykule przedstawiono aparat matematyczny do opisu stanów pracy transformatora na podstawie analizy zjawisk wibroakustycznych.
6
Content available remote Electro-cost models of sources and loads for local object power control
Zhuikov V., Petergerya J., Ivanin O.
Przegląd Elektrotechniczny
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2010
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R. 86, nr 1
71-73
EN
This paper proposes a concept of electric power generation and consumption control in local electrotechnical objects with regard to cost factors. “Electro-cost” models of sources and loads including both technical dynamic equations and economic theory equations have been developed. The algorithm developed based on this theory allows to find the operating mode of the local object featured by minimum costs.
PL
Praca rozważa koncepcję sterowania generacją i zużyciem mocy w lokalnym systemie elektroenergetycznym z uwzględnieniem współczynników charakteryzujących koszty energii. Zaproponowano modele elektryczno-kosztowe źródeł i obciążeń, uwzględniające jednocześnie równania dynamiczne systemu elektrycznego i ekonomiki działania systemu. Rozwiązanie powstałego w ten sposób układu równań pozwala na określenie optymalnych warunków działania lokalnej sieci elektroenergetycznej przy minimalnych kosztach.
7
Content available remote Estimation of operating modes of the self-excited current inverter with use SFI-wavelet transformation
Zhuikov V., Tereschenko T., Khyzhnyak T.
Przegląd Elektrotechniczny
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2004
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R. 80, nr 6
574-577
EN
Application of the SFI-wavelet transformation for fault isolation in self-excited current inverter consider in this paper. Definition of the fault type based on the analysis of current and voltage spectrum constructed with the use of SFI-wavelet transformation.
PL
Zastosowano transformatę falkową do określenia warunków izolacji samowzbudnego falownika prądu. Wykorzystano analizę spektralną prądu i napięcia otrzymaną przy użyciu transformaty falkowej typu SFI.
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