Tekhnichna Elektrodynamika

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ISSN / EISSN : 1607-7970 / 2218-1903
Total articles ≅ 523
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I.S. Zubkov, V.Ya. Hutsaliuk, O.M. Yurchenko
Tekhnichna Elektrodynamika, Volume 2022, pp 27-34; https://doi.org/10.15407/techned2022.02.027

Abstract:
The digital phase-locked loop (PLL) system for the resonant voltage inverter with pulse density modulation of induction heating installations is developed. The proposed system for frequency determination uses the feedback signal on the collector-emitter (drain-source) voltage of the inverter transistors and on the output current of the inverter, and stores this frequency on the interval of zero output voltage. A study of the PLL system in different operating modes when changing the load parameters is presented. References 8, figures 6, table 1.
Tekhnichna Elektrodynamika, Volume 2022, pp 70-79; https://doi.org/10.15407/techned2022.02.070

Abstract:
The article considers the problems that arise during the operation of high-power photovoltaic solar power plants as part of integrated power systems. The necessity of using energy storage systems to stabilize the operation of solar power plants is described and the calculated mathematical model of their joint operation is given. A study of the operation of a solar power plant with a fixed capacity of photovoltaic modules of 20 MW together with the energy storage system and determined the capacity of batteries needed to stabilize the power supply of electricity to the grid. For the day with the largest volumes of electricity production, in order to fully stabilize the operation of a solar power plant, it is necessary to release 41% of all generated electricity directly into the grid, and other volumes must be accumulated with subsequent discharge. Connecting batteries to a solar power plant allows to reduce the installed capacity of inverters from 18 to 3-5 MW, which reduces the cost of electricity production by 13-16%. According to the data on capital investment and operating costs during the entire period of operation solar power plants together with the energy storage system for the built in 2020 and 2040, the levelized cost of energy, storage and supply into the grid was determined. References 12, figures 5, table 1.
, Н.і. Супруновська
Tekhnichna Elektrodynamika, Volume 2022, pp 3-11; https://doi.org/10.15407/techned2022.02.003

Abstract:
The paper reveals the electro-physical features of the formation of multi-channel pulse currents and fast-migrating electric sparks in the layer of current-conductive granules of electric-discharge installations (EDIs) with reservoir capacitors. Such features make it possible to increase many times the productivity of the electric-spark dispersion of metal granules during single discharge current of reservoir capacitors, which flows between the electrodes of EDIs. Theoretical substantiation and experimental confirmation of multi-channel spark discharges in the layer of conductive granules are presented. The influence of the capacitance and charge voltage of reservoir capacitors on the nature of transient processes in the discharge circuit of the EDIs is investigated. The dependence of the effective value of the active load resistance of the EDIs on the value of the pre-charge voltage of its reservoir capacitors and the value of its capacitances has been experimentally determined. It is proved that an increase in the averaged Q-factor of the discharge circuit with an increase in the charge voltage of the capacitor bank of EDI is caused by a decrease in the effective value of the active resistance of the layer of metal granules when spark-generating discharge currents flow through it. References 16, Figures 7.
A.P. Raschepkin, I.P. Kondratenko, O.M. Karlov, R.S. Kryshchuk
Tekhnichna Elektrodynamika, Volume 2022, pp 43-51; https://doi.org/10.15407/techned2022.02.043

Abstract:
Pulsed currents and magnetic forces of an induction system with a spiral winding and a ferromagnetic shield for processing non-magnetic thin-sheet metal strips in order to create magnetoplastic, electroplastic effects due to eddy currents are studied. Under the strip there is the ferromagnetic shield, and above it – spiral winding. The aim of the work is to develop an analytical method for calculating transients of pulsed currents in an electric circuit with the induction system and a capacitor charged to certain voltage taking into account influence of the ferromagnetic shield to perform investigation of time-varying magnetic field. Electromagnetic parameters of the inductor are determined by computer simulation using the finite element method in the mode of harmonic currents. Current transients in the electric circuit are calculated using known in theoretical electrical engineering mathematical dependences and distribution of current density and magnetic forces in the strip is calculated by the finite element method in the mode of transients. Influence of the ferromagnetic shield on electromagnetic processes in the induction system for the set ranges of strip’s thickness, its electrical conductivity and current frequency is established. Electromagnetic force between the spiral winding and the strip, the current density in the strip, as well as the moments of time at which the current and force have maximum values are studied. References 14, figures 6, tables 2.
O.M. Popovych, І.в. Головань
Tekhnichna Elektrodynamika, Volume 2022, pp 52-59; https://doi.org/10.15407/techned2022.02.052

Abstract:
The stages, methodology and complex design tools of electromechanical systems with inductions motors are substantiated. A quantitative assessment of the possibilities of increasing their economic efficiency using complex design according to the criterion of maximum income is provided. The expressions of complex criteria of efficiency, complex mathematical models and research methods are substantiated. The change in economic efficiency is determined when the value of design parameters deviates from the optimal value. Using the developed means of complex design can increase economic efficiency by tens of percent is shown. References 22, table 1, figures 2.
I.V. Blinov, I.V. Trach, Ye.V. Parus, D.G. Derevianko, V.M. Khomenko
Tekhnichna Elektrodynamika, Volume 2022, pp 60-69; https://doi.org/10.15407/techned2022.02.060

Abstract:
The problems of mode regulation of distribution networks in Ukraine are investigated in this paper. Authors propose to regulate the modes of distribution networks by the means of convertors of renewable energy sources (solar power plants etc.) connected to this networks according to the Smart Grid concept. The analysis of multicriteria mode optimization results of the distribution network was performed and the most perspective criterion were selected according to the features of structure and functioning of distribution networks in Ukraine. The target function of multicriteria optimization by the criteria of minimization of reactive power on the main section of the line and minimization of standard voltage deviations from the nominal value is formalized by the authors. To calculate the optimal value for the target function, the Multivariable extremum seeking control method was chosen, this method was improved by adding additional filters of individual frequency channels. An example of calculations is given in the paper; it illustrates the efficiency of the proposed method of modes regulating of the distribution networks. References 24, figures 3, tables 2.
V.V. Makarenko, National Technical University of Ukraine ", , V.K. Gurin, Igor Sikorsky Kyiv Polytechnic Institute"
Tekhnichna Elektrodynamika, Volume 2022, pp 35-42; https://doi.org/10.15407/techned2022.02.035

Abstract:
The paper proposes a methodology for designing a filter for lowering conductive interference level, generated by pulse voltage converters. Not only the proposed method takes into account the requirements of the standard for electromagnetic compatibility, but also the parameters of the LISN node to measure the level of noise, which are given by a converter to a power supply chain. The articles describes the example of the filter design for a lowering DC-DC converter the noise level of which is in accordance with the standard CSPR25. All stages of design are illustrated by models, they are developed in the LTspice program. Models for analyzing the amplitude-frequency response of a interference filter loaded on a LISN are presented. It is shown that when modeling the operation of pulse sources, it is not advisable to use LISNs with the idealized characteristics of elements. The obtained filter calculations’ results confirm the correctness of the proposed method. References 11, figures 9.
K.O. Lypkivskyi, A.G. Mozharovskyi
Tekhnichna Elektrodynamika, Volume 2022, pp 21-26; https://doi.org/10.15407/techned2022.02.021

Abstract:
Harmonization of the requirements of certain groups of electrical and electrotechnological consumers of electricity with the current supply conditions requires in many cases the use of converters. Prominent among the systems designed to purposefully change the supply voltage of such consumers (regulation, stabilization) are converters with transformer-and-switches executive structure or tap changing (smart) transformers, which use discrete-time control, in particular so-called multi-level AC rectifiers (MLR). In the synthesis of MLR the main problem is to determine the optimal law of sectioning of the secondary envelope of its transformer. The paper analyzes the features of MLR decomposition into two functionally identical blocks under the given limitation of the output voltage control range and its difference from the decomposition of wide-range MLRs. The a priori variety of circuit technical solutions of such MLRs is determined. New MLRs with high efficiency of semiconductor switch elements use are offered. References 15, figures 7, tables 3.
M.Yu. Artemenko, National Technical University of Ukraine ", V.V. Chopyk, V.M. Mikhalsky, I.A. Shapoval, S.Y. Polishchuk, Igor Sikorsky Kyiv Polytechnic Institute"
Tekhnichna Elektrodynamika, Volume 2022, pp 12-20; https://doi.org/10.15407/techned2022.02.012

Abstract:
The idea of distributed active filtration is to compensate for the currents of higher harmonics and undesirable components of the power of the main network with inverters of renewable energy converters of the connected microgrid, which have reserves of apparent power. For the convenience of distributed compensation, it is proposed to identify the sinusoidal mode of the three-phase four-wire power system, provided that the symmetric source is six mutually orthogonal components of the three-coordinate vector of line currents. The power of imbalance is shown to be due to four mutually orthogonal components of the three-coordinate vector of line currents with defined reference voltage vectors, each of which is proportional to a separate orthogonal component of the power of imbalance. Integral formulas for determining the scalar values of the four specified orthogonal components of imbalance powers have been obtained, which open the possibility of accounting for their contribution to the deterioration of the quality of electrical energy and the synthesis of control signals for active distributed filtration. The connection between the four specified orthogonal components of the power of imbalance and the parameters of the linear unbalanced load was established, which made it possible to verify these integral formulas using a computer experiment. It is analytically established and experimentally confirmed that the squares of the two orthogonal components of the imbalance powers associated with the current of the neutral wire are included in the decomposition of the square of apparent power and power losses with the multiplier, depending on the ratio of the resistances of the transmission line of the three-phase four-wire power system. References 17, figures 3.
, O.D. Podoltsev, I.M. Kucheriava
Tekhnichna Elektrodynamika, Volume 2022, pp 17-24; https://doi.org/10.15407/techned2022.01.017

Abstract:
In the article, the numerical calculation and analysis of three-dimensional magnetic field of underground power cable line with finite-length magnetic shields used to reduce the level of this field on the ground are carried out. Both fill-up soil and filling soil containing magnetic particles and then having effective magnetic properties (=1÷1000) are proposed to used as magnetic shields. The shielding efficiency is studied for underground 330 kV cable line depending on the dimensions and effective magnetic permeability () of the shields. As shown, the use of filling soil with magnetic properties gives a possibility to reduce the field on the ground five times. This type of shielding is more efficient as compared to magnetic fill-up soil. The computed results reveal the non-monotonic variation of magnetic field on the ground above the soil edge zones. The longitudinal size of these zones is in the order of the depth of the cables. References 16, figures 9.
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