Technical Electrodynamics最新文献

{"title":"HISTORY OF ENERGY INDUSTRY IN KYIV: 125 YEARS OF CENTRAL ELECTRIC STATION","authors":"N. Dunayevska, V.Ya. Yevtukhov","doi":"10.15407/techned2023.05.082","DOIUrl":"https://doi.org/10.15407/techned2023.05.082","url":null,"abstract":"The history of the construction and operation of the object of cultural heritage - the Kyiv Central Power Station (ЦЕС-1), the second alternating current station in pre-revolutionary Russia, is considered. The development and improvement of electrical and thermal equipment, changes in the fuel base during the difficult times of the First World War, the revolution and the establishment of Soviet power in Kyiv. The transfer of the station to the control of the Academy of Sciences of the Ukrainian SSR, the beginning of research on MHD energy generation, the construction of the second largest research facility in the USSR for this technology began a new - scientific stage in the life of CES-1 as a scientific and experimental base of the Institute of Electrodynamics of the Academy of Sciences of the Ukrainian SSR. For now, the work of the team of scientists and engineering personnel is focused on thermal engineering problems of energy already within the framework of a separate Institute - thermal energy technologies of the National Academy of Sciences of Ukraine. This living monument of the era of industrialization (end of the 19th - 20th centuries) has complex significance for Kyiv and Ukraine: as a legacy of the history of energy and as an active experimental and technological complex.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44512631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RESEARCH OPTIMIZATION OF THE MODE OF FULL REACTIVE POWER COMPENSATION IN THE ELECTRICAL NETWORK","authors":"V. Yagup, K. Yagup","doi":"10.15407/techned2023.05.055","DOIUrl":"https://doi.org/10.15407/techned2023.05.055","url":null,"abstract":"The article is devoted to the investigation of reactive power compensation modes in a closed electrical network, which is significantly loaded with active-inductive elements in the nodes of electricity consumption. The initial mode without compensation is compared with the modes of partial and full compensation of reactive power using capacitor compensation banks. It is shown how to determine this mode using search optimization using a visual model of the electrical network. Quantitative indicators of the compared modes are presented, which convincingly demonstrate the advantages of full reactive power compensation in the electrical network. References 15, figures 9, table 1.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47202637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IMPROVED MATHEMATICAL MODEL OF THREE-WINDING ASYNCHRONOUS MACHINE","authors":"L. Mazurenko, K. M. Vasyliv, O. Dzhura","doi":"10.15407/techned2023.05.028","DOIUrl":"https://doi.org/10.15407/techned2023.05.028","url":null,"abstract":"In phase coordinates, a mathematical model of a three-winding asynchronous machine with two windings on the stator as a structural element of electric drives and asynchronous generators with inverter and inverter-capacitor excitation for autonomous electric power plants, oriented to explicit methods of numerical integration of the system of differential equations, has been developed. The model takes into account the displacement angle between two stator windings in the range of 360º and other important factors affecting the course of electromagnetic processes occurring in the machine. On the basis of the mathematical model, a program code was developed as a means of computer verification of machine operation modes. The results of computer study performed with the help of the code confirm the suitability of the mathematical model of a three-winding asynchronous machine to take into account the influence of the displacement angle between the stator windings and their simultaneous and single power supply during the operation of the machine in motor mode. References 11, figures 10.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42058620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EFFICIENCY OF OPTICAL CALIBRATION IN HIGH PRECISION LASER RANGEFINDERS","authors":"I.O. Brahynets, Yu.O. Masjurenko","doi":"10.15407/techned2023.05.074","DOIUrl":"https://doi.org/10.15407/techned2023.05.074","url":null,"abstract":"The effectiveness of the use of optical calibration in high-precision phase laser rangefinders has been evaluated. In order to ensure the specified accuracy of distance determination in order to establish the optimal frequency of distance measurement modes and optical calibration, an appropriate formula is recommended for estimating the switching frequency of signals at the input of the range finder measuring channel. It has been established that even when using optical calibration, the accuracy of distance measurement is affected by the error of the phase detector, which is part of the rangefinder. To minimize the influence of this error, a new method for the direct measurement of the phase shift in a range finder is proposed, as well as the use of a compensation method for measuring the phase shift. The corresponding block diagrams of rangefinders are considered, in which the proposed methods for measuring phase landslides are implemented, and analytical modeling of the processes that transform them is carried out. References 7, figures 2.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48117994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EVOLUTION AND DISSEMINATION OF SPECIALIZED STRATEGIES, METHODS, AND TECHNIQUES OF SYNCHRONOUS PULSEWUDTH MODULATION FOR CONTROL OF VOLT-AGE SOURCE INVERTERS AND INVERTER-BASED SYSTEMS","authors":"V. Oleschuk","doi":"10.15407/techned2023.05.014","DOIUrl":"https://doi.org/10.15407/techned2023.05.014","url":null,"abstract":"This publication provides a brief historical overview of the development of methods and techniques of pulsewidth modulation (PWM) for voltage source inverters, published mainly in Ukrainian publishing houses and in Ukrainian periodicals. Accent has been done to review of results of investigation of alternative methods and techniques of synchronous space-vector-based multi-zone PWM for inverters with low switching frequency. In particular, in the mentioned publications, the basic strategies, schemes, and algorithms of synchronous multi-zone modulation have been further developed, modernized, modified, and disseminated in relation to new promising topologies of power conversion systems, including: two-inverter-based electric drives with open-end winding of electrical motor; dual three-phase electric drives of symmetrical and asymmetric types; powerful six-phase systems based on four inverters, and two-inverter-based and three-inverter-based photovoltaic installations with multi-winding transformer. It is shown that the developed schemes and algorithms of synchronous space-vector PWM, applied for control of inverter-based systems, provide continuous synchronization and symmetry of basic voltage waveforms of systems during the whole control range including zone of overmodulation of inverters. It provides minimization of even harmonics and undesirable subharmonics (of the fundamental frequency) in spectra of the basic voltages of systems, leading to reducing of losses in systems and to increasing of its efficiency. Based on a comparative analysis of the integral spectral characteristics of the phase and line voltages of systems, recommendations are formulated for the rational choice of schemes and algorithms of synchronous modulation for the relevant installations, depending on the modes of their operation. References 30, tables 2, figures 25.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47259940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RESONANCE SYSTEM OF WIRELESS ENERGY TRANSMISSION WITH USING OF THE ELECTRIC FIELD","authors":"A. Vdovychenko","doi":"10.15407/techned2023.05.008","DOIUrl":"https://doi.org/10.15407/techned2023.05.008","url":null,"abstract":"The paper reviews the existing types of wireless technologies for power transmission using electromagnetic interaction. According to the type of interaction, systems using magnetic, electric and electromagnetic components are distinguished. Short-range, medium-range and long-range systems are distinguished by range. As promising for implementation in future unmanned systems, the work considers a modified system of wireless transmission of electrical energy using an electric field. The scheme is presented and the principle of operation of such a system is considered. The characteristics of resonant circuits used as emitters and receivers in such a system were studied. The results of measuring the parameters of the spatial distribution of the electric field of the resonators are presented. The interaction of the spectral components of the input signal and the resonant characteristics of the radiating circuits was investigated. The paper presents the method of determining the efficiency of electric energy transmission at high frequencies and the results of measurement of transmission efficiency for the studied type of systems. It was concluded that there is an active factor in the form of an alternating electric field, the feature of which propagation allows creating a device suitable for powering unmanned mobile systems of low and medium power. References 11, figures 4, tables 2.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48721522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DETERMINATION OF THE RESISTANCE OF GROUNDING DEVICES OF SUBSTATIONS 330(220) kV","authors":"O. Glebov, D. Koliushko, A. V. Plichko, S. Rudenko","doi":"10.15407/techned2023.05.064","DOIUrl":"https://doi.org/10.15407/techned2023.05.064","url":null,"abstract":"In the electric power industry of Ukraine, the main system-forming objects are power transmission lines and substations with 330(220) kV switchgear. The most powerful sources of danger at substations are short circuits on the busbars, a direct lightning strike or the operation of overvoltage limiters and arresters.The purpose of the article is to develop a method for determining the resistance of the grounding system of substations with open switchgear 330(220) kV, aimed at increasing accuracy, taking into account the most influential independent factors. The provisions of the theory of experiment planning, the theory of electric circuits, mathematical modeling in the package Grounding 1.0, LiGro and Microsoft Excel were used to conduct the research. In the paper, a comparative analysis of the known formulas for determining the resistance of the grounding system is carried out: the formula of the GOST 12.1.30-81 standard, Ohlendorf-Laurant, Laurent and Neumann, Schwartz, Sverak formulas, as well as the formula of the international standard IEEE Std 80-2013. The results of multifactorial experiments to determine the dependence of the resistance of the grounding system on its area, the size of the grid cell, the perimeter of the cross-section of the grounding, the equivalent specific resistance of the soil, the short-circuit current and the depth of the grid location are given. A graphical comparison of the results of determining the resistance according to the considered formulas was carried out. In the paper, the method of determining the parameters of grounding system of 330(220) kV substations was further developed, aimed at ensuring standardized values of the resistance of the grounding system and the ground potential rise using formulas obtained from the results of multifactorial experiments. The results obtained in the work will make it possible to reduce the probability of damage to the insulation of 6-10 kV cables, as well as cables of secondary circuits from low-frequency and high-frequency (pulse) voltages when large currents flow into the grounding system in the mode of a single-phase short-circuit to the ground in electrical grid with a grounded neutral. References 9, tables 2, figures 6.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48737773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE DETERMINATION OF THE PARAMETERS OF THE MAIN ELEMENTS OF THE WIRELESS CHARGER FOR CHARGING AN ELECTRIC CAR BATTERY","authors":"A. Zharkin, O. D. Podoltsev, V. Pavlov","doi":"10.15407/techned2023.05.003","DOIUrl":"https://doi.org/10.15407/techned2023.05.003","url":null,"abstract":"The work has developed a methodology for calculating voltage values on the main elements of the wireless battery charging system, which allows at the design stage of such systems to choose the necessary parameters of coils and an additional high-frequency transformer, while harmonizing the voltage value on the battery with the voltage at the output of the high-frequency inverter. A comparison of the calculation results using the developed methodology with the corresponding results obtained using the developed Simulink-model of the system showed that their maximum discrepancy does not exceed 15%. It is noted that in practice, when developing such systems to match the voltage of the rechargeable battery with the high-frequency inverter, it is possible to either use an additional high-frequency transformer, or choose the necessary ratio of turns of the transmitting and receiving coils. In the latter case, the possibility of high voltage resonance voltage on the coils and capacitive elements should be taken into account, which requires the use of reinforced insulation and the fulfillment of all requirements for the operation of devices at the corresponding high voltage. References 6, figures 3, table 1.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48929773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THREE-DEGREE-OF-FREEDOM ELECTRIC MACHINE WITH INTERNAL AND EXTERNAL ROTOR: COMPARATIVE ANALYSIS OF CONTROL PERFORMANCE","authors":"I. Petukhov, V. Kireyev, K. Akinin, V. Lavrynenko","doi":"10.15407/techned2023.05.038","DOIUrl":"https://doi.org/10.15407/techned2023.05.038","url":null,"abstract":"Two structures of electric machines with three degrees of freedom of the rotational movement of the rotor are considered - with an external and an internal rotor held on an internal cardan suspension. A three-plane symmetric magnetic system was chosen for the comparative analysis and such a choice was justified. Limitations are formulated that allow considering the rotor as a conservative mechanical system, as well as considering the magnetic field in the electric machine as magnetostatic. Mathematical models of the rotational motion of a body with a fixed center of mass, as well as the force interaction of the magnetic field of a permanent magnet located on the rotor and the control winding located on the stator, are given. The peculiarities of the distribution of electromagnetic forces in both structures are analyzed and the greater efficiency of the formation of these forces in the structure with an internal rotor is shown. Expressions for the components of the electromagnetic moment for use in the \"COMSOL Multiphysics\" interface are obtained. Forced precession movement for both structures was analyzed in the case of equal radii of the control windings and in the case of the same dimensions of the magnetic systems. It was determined that the structure with an external magnetic circuit is able to provide an order of magnitude smaller angular velocity of precessional movement and, at the same time, an equally smaller range of nutation. References 14, figures 10.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46186901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CONCEPT OF BUILDING A STRUCTURALLY VARIABLE POWER SYSTEM OF UKRAINE","authors":"S. Saukh","doi":"10.15407/techned2023.05.048","DOIUrl":"https://doi.org/10.15407/techned2023.05.048","url":null,"abstract":"To support the sustainable functioning and development of the energy sector in the conditions of terrorist and military threats, the concept of building a structurally variable electric power system (EPS) is proposed. Structural variability is defined as the ability of the EPS to reproduce such a variety of subsystems and electrical connections between them, which enables the operator to manage the structure of the EPS and, in this way, ensure the stable operation of the electric power industry in conditions of purposeful destructive actions. The concept of a structurally changing EPS is a strategy for anticipating challenges and threats to the sustainable functioning and development of the electric power industry. In order to build a structurally variable EPS, it is proposed to create regional EPSs with their own capacities for production, storage, distribution and supply of electricity in volumes sufficient for consumption by the population, housing and communal services, transport and agriculture within each region. The establishment of the territorial dimensions of individual subsystems, i.e. regional EPS, is determined on the basis of a compromise between the necessary number of such subsystems and connections between them, which ensure the desired degree of variability of the EPS, and the capitalization levels of the regions sufficient to support investment and operating costs for the corresponding regional EPS. It is assumed that the national EPS supports the regional EPS with agreed amounts of maneuvering and reserve capacities and ensures the supply of electricity to enterprises of industrial, construction, transport and other types of economic activity that are of national importance and do not join the regional EPS. In cases of destruction of individual regional power plants, the national power plant, as well as undamaged neighboring regional power plants, together provide the electricity needs of the affected regions. In the structurally variable EPS, uniform rules of behavior of all energy companies as market participants interacting at the national and regional levels should apply. For the organization of such interaction, it is proposed to apply the decomposition of trading platforms and form a distributed electricity market from interconnected upper-level electricity market and regional electricity markets. References 12, figures 6.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44330410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}