Technical Electrodynamics最新文献

{"title":"ENERGY CHARACTERISTICS OF THE ELECTROMAGNETIC VIBRATION DRIVE WITH PULSE POWER SUPPLY OF VIBRATOR COILS","authors":"O. Cherno, A. Hurov, A. V. Ivanov","doi":"10.15407/techned2023.02.053","DOIUrl":"https://doi.org/10.15407/techned2023.02.053","url":null,"abstract":"Vibrating equipment provides various technological processes, such as transportation, separation, compaction of mixtures. The electromagnetic drive is usually used in vibrating conveyors, feeders and other devices where vibration parameters are automatically controlled. Increasing the energy efficiency of such devices is an important task. The paper examines the influence of the power supply voltage on the energy characteristics of the electromagnetic vibration drive and determines the most effective voltage form. To do this, an analysis of factors affecting the efficiency of the drive was carried out. It was found that one of the factors is the time interval between the maximum current and the minimum value of the air gap, and increasing the efficiency is possible by reducing this interval by forming bipolar rectangular voltage pulses with maximum amplitude, which create narrow sharp pulses of the vibrator coil current. As a result of the numerical modeling of the processes in the drive, it was found that with increasing power, current pulses cause short-term deep saturation of steel, which leads to increased losses and reduced efficiency. Therefore, a zero voltage interval was added between the positive and negative voltage pulses, which limits the peak current values. The simulation of the processes in the vibration drive with the voltage supply of the proposed form was carried out, its energy characteristics were calculated: the dependence of the efficiency on the frequency at different load values, the dependence of the maximum values of the efficiency on the power. It was established that the use of pulsed power supply makes it possible to increase the efficiency of the drive up to 80% in the power range from 0.25 of the nominal value to the nominal one, which is on average 10% more compared to sinusoidal voltage. The dependences of frequency and zero voltage interval optimal values (according to the criterion of maximum efficiency) on power, which can be used in automatic control of the drive, have been obtained. References 10, figures 9, tables 2.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48664654","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":"EVALUATION OF THE AGING RATE OF POLYMER INSULATION OF POWER CABLE UNDER THE ACTION OF PERIODIC NON-SINUSOIDAL VOLTAGE","authors":"O. D. Podoltsev, M. Lomko","doi":"10.15407/techned2023.01.007","DOIUrl":"https://doi.org/10.15407/techned2023.01.007","url":null,"abstract":"The paper proposes a method for estimating the rate of water treeing growth in the polymer insulation of the power cable, taking into account the presence of higher voltage harmonics. The technique allows to predict the service life of a cable used in a power grid with a distorted voltage, depending on the frequency spectrum of this voltage, as well as to select at the design stage of the cable line the calculated value of the nominal voltage of the cable the service life of the cable will be the same as when operating normally. To implement this technique, a computer program in the Matlab/Simulink package has been developed, which allows to perform appropriate calculations and estimate the service life of the cable insulation according to a predetermined form of distorted voltage in the power grid. For the voltage oscillogram considered as an example, characterized by the value of THDU = 23.4%, it is shown that the value of the relative water treeing growth is equal 1.62, and the service life of the cable will be 0.62 of its service life when operating normally. References 6, figures 4.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42789170","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":"DECISION-MAKING METHOD FOR THE OPTIMUM ALLOCATION OF CHARGING STATIONS Of ELECTRIC VEHICLE IN DISTRIBUTION NETWORKS","authors":"Ahmed Jassim Ahmed, Mohammed H. Alkhafaji, A. Mahdi","doi":"10.15407/techned2023.01.067","DOIUrl":"https://doi.org/10.15407/techned2023.01.067","url":null,"abstract":"Electric vehicles are becoming prominent nowadays and playing an important role in the transportation sector as conventional vehicles affect the environment. The rising number of vehicles requires increasing the charging stations, which affects the distribution network if placed randomly. Therefore, selecting the optimal place for these charging stations is very important to mitigate the effect on the distribution system. This paper presents a decision-making method to select the location of the charging station in a radial distribution system optimally. The fixed point algorithm was used for the analysis of load flow. The analysis was carried outand tested on the 33 bus IEEE and a real case study in Iraq was used for the study. The result of the charging station placement is compared with other research and showed its efficiency in work. The analysis showed the effectiveness of the proposed method in reducing the effect of charging stations on voltages and losses under different conditions. References 27, Figures 10, Tables 6.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48055011","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 PARAMETERS OF TYPICAL DIGITAL STATIC REGULATORS OF INDUSTRIAL ELECTRIC DRIVES","authors":"Y. Shurub","doi":"10.15407/techned2023.01.034","DOIUrl":"https://doi.org/10.15407/techned2023.01.034","url":null,"abstract":"The paper is devoted to the development of an analytical method for determining the settings of typical digital static regulators of industrial electric drives, which can be represented as discrete transfer functions in the Z-transform. It is offered to define parameters of adjustment of static regulators, proceeding from the set static error (statism). The possibility of technical realization of the digital proportional-differential regulator with an ideal digital differentiator is substantiated. Significant improvement of system performance indexes when using the differential component of a digital static controller is shown. References 10, figures 7.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48365920","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":"MULTICHANNEL CLOCK SIGNAL MONITORING APPLIANCES FOR SMART GRID NETWORKS WITH SPEED-OPTIMAL PHASE-LOCKED LOOP","authors":"O. Samkov, V. Koval, V.P. Lysenko, D. Kalian, O. Rybina, O. Osinskyi","doi":"10.15407/techned2023.01.081","DOIUrl":"https://doi.org/10.15407/techned2023.01.081","url":null,"abstract":"The paper discusses a multichannel monitoring device with a speed-optimal phase-locked loop system, which, by performing simultaneous measurements of several clock signals against the reference one, processing and transmitting measurement results by an IP-network in real time, increases the accuracy and precision of providing time synchronization signals for SMART Grid energy system. Analytical expressions where established to determine the conditions under which in the optimal system of phase-locked loop has no influence on the transient process of limiting the periodic static characteristic of the phase discriminator. Experimental studies have confirmed meeting the norms of the European standard ETS 300 462-4 for the time parameters of the reference signal generated by the phase-locked loop system, which is optimal in terms of speed, and also demonstrated the effectiveness of the proposed implementation of the device for multi-channel monitoring of time synchronization signals for SMART Grid of power systems. References 12, figures 7.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42427485","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":"PULSED BARRIER DISCHARGE FOR TREATMENT OF SURFACES OF 25ХГНМТ STEEL PLATES","authors":"I. Bozhko, I. Kondratenko, L. Lobanov, М. Pashchin, O. Berdnikova, O. Mykhodui, O. Kushnarova, P. Goncharov","doi":"10.15407/techned2023.01.076","DOIUrl":"https://doi.org/10.15407/techned2023.01.076","url":null,"abstract":"The development of high-tech industries stimulates the growth of requirements to metal structures and a complex of their main and special properties. The use of pulsed electrical discharges, plasma currents, pulsed electromagnetic fields, and their combined effects to improve the mechanical characteristics of metals and alloys is relevant in connec-tion with the need in replacing traditional energy-intensive technologies of structural materials with more advanced ones. The use of pulsed barrier discharge (PBD) in metal treatment, which generates a low-temperature plasma on the surface of the metal being treated, is a new approach to optimize the mechanical properties of metal materials, which is based on electrophysical processes. In the work, strengthening of structural 25KhGNMT steel as a result of the action of PBD on its surface was studied. The treatment of steel by PBD took place in a discharge device at a voltage incre-ment rate of ≈3•1011V/s. The influence of the duration of PBD treatment on the value of Vickers hardness (HV) of the test samples was studied. The study of the structure of 25KhGNMT steel was carried out by the method of transmission electron microscopy in order to determine its changes as a result of the action of PBD. It was established that HV val-ues after PBD treatment increase from 420 to 500 kg/mm2, which is accompanied by microstructure dispersion, which positively affects the mechanical characteristics of 25KhGNMT steel. References 14, figure 5, table 1.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41966359","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":"ADAPTIVE FREQUENCY OBSERVERS FOR TWO-PHASE AND SINGLE-PHASE HARMONIC SIGNALS","authors":"S. Peresada, Y. Nikonenko, S. Kovbasa, A. Kuznietsov","doi":"10.15407/techned2023.01.025","DOIUrl":"https://doi.org/10.15407/techned2023.01.025","url":null,"abstract":"An adaptive observer for frequency and magnitude of two-phase symmetrical sinusoidal signal is presented. It is de-signed based on control concept of internal model approach. The observer guarantees global exponential estimation and high performance. If the information about one of the two-phase signal components is missing, a modified structure of the observer is proposed. This case is equivalent to the measurement of a single-phase sinusoidal signal. The proper-ties of local exponential stability of single-phase signal observer are proved using Lyapunov’s conversion theorem for disturbed systems. The robustness of the two-phase signal observer with respect to additive disturbances (high-frequency noise, varying frequency) is confirmed by simulation results. It is shown that the observer estimation speed can be arbitrarily increased by increasing the feedback gains. A method for single-phase harmonic signal frequency observer tuning is developed, which ensures the expansion of the stability region. References 14, figures 7.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41646426","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":"OPTIMIZATION OF CONSUMPTION OF PRIMARY FUEL IN LOCAL ELECTRICITY MARKETS FOR SYSTEMS USING DIESEL GENERATORS","authors":"S. Denysiuk, H. Bielokha, D. Derevianko","doi":"10.15407/techned2023.01.056","DOIUrl":"https://doi.org/10.15407/techned2023.01.056","url":null,"abstract":"Local energy markets represent a separate distribution system with several sources of distributed generation and with its own network-independent operator. The cost of electricity in local systems depends on many criteria. They include the consumption of primary fuel for diesel generators, which depend on their capacity. Equal distribution of power on generators running in parallel leads to an increase in primary fuel consumption. An algorithm for optimizing fuel consumption, which calculates the power distribution of generators connected in parallel, has been developed. These capacities correspond to the minimum value of fuel consumption. The system using three diesel generators and the option of replacing one generator with a solar electric installation was considered. The use of the optimal algorithm allows for reducing the price by an average of 9 to 20% if compared to the uniform distribution. The introduction of a photovoltaic system with a rechargeable battery allowed to increase energy efficiency and reduce the price due to lower running costs of the solar installation. References 10, figures 3, tables 1.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48213237","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":"ELECTRO-PHYSICAL PROCESSES OF DEGRADATION OF CROSS-LINKED POLYETHYLENE INSULATION OF POWER CABLES AND SELF-CARRYING INSULATED WIRES UNDER NON-SINUSOIDAL VOLTAGES AND CURRENTS","authors":"A. Shcherba, М.А. Shcherba, J. Peretyatko","doi":"10.15407/techned2023.01.003","DOIUrl":"https://doi.org/10.15407/techned2023.01.003","url":null,"abstract":"The features of electro-physical processes of degradation of cross-linked polyethylene (XLPE) insulation of power cables and self-carrying insulated wires (SIW) are studied, taking into account water microinclusions and dendrite branches that appear in such insulation during manufacture and operation. It is substantiated that the appearance of non-sinusoidal voltages and cur-rents in power transmission lines (TL) using modern power cables and SIW with solid XLPE insulation causes an increase in electro-physical factors aimed at increasing the pulsating electromechanical pressure on the surface of solid XLPE insulation by liquid conductive microinclusions and dendrite branches and an increase in over time, their sizes along the strength of the exist-ing electric field (EF). The paper defines the patterns of change over time in the magnitude of the stressed volume and the maxi-mum pressure in the XLPE insulation and the additional impact on such patterns of higher harmonic components of electrical voltages and currents during non-sinusoidal processes in such insulation. It is indicated that such electro-physical effects on solid polymer insulation lead to an increase in the intensity of both threshold mechanisms and stochastic ones of destruction of the microstructure of the solid XLPE insulation of power cables and self-carrying insulated wires and require the development of additional regulations for standard conditions for their manufacture and operation. References 10, figures 3.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45359806","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":"ANALYSIS OF FREQUENCY CHANGE IN THE IPS OF UKRAINE UNDER DIFFERENT REGIMES OF ITS OPERATION","authors":"O. Kyrylenko, V. Pavlovskyi, A. Steliuk, О.V. Lenga, V.B. Zaychenko, Yu.G. Lykhovyd","doi":"10.15407/techned2023.01.051","DOIUrl":"https://doi.org/10.15407/techned2023.01.051","url":null,"abstract":"The article presents the main analysis results of the frequency change in the interconnected power system (IPS) of Ukraine under the conditions of its isolated operation, as well as synchronous operation with the UPS/IPS and ENTSO-E. The reasons for the change in the maximum and minimum values are considered, as well as the frequency histo-grams for the above modes of operation of the IPS of Ukraine are presented. References 5, tables 1, figures 7.","PeriodicalId":38557,"journal":{"name":"Technical Electrodynamics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49212364","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}