Tekhnichna Elektrodynamika最新文献_第4页

REDUCTION OF THE INFLUENCE OF DEVIATIONS OF GENERATOR PARAMETERS IN PRECISION QUADRATURE BRIDGES 减少精密正交电桥中发电机参数偏差的影响

Tekhnichna Elektrodynamika Pub Date : 2024-01-31 DOI: 10.15407/techned2024.01.077

P.I. Borchshov, O. Lameko, V. Melnyk

{"title":"REDUCTION OF THE INFLUENCE OF DEVIATIONS OF GENERATOR PARAMETERS IN PRECISION QUADRATURE BRIDGES","authors":"P.I. Borchshov, O. Lameko, V. Melnyk","doi":"10.15407/techned2024.01.077","DOIUrl":"https://doi.org/10.15407/techned2024.01.077","url":null,"abstract":"The article is devoted to solving the problem of attestation of electric capacity standards at industrial frequency. The expediency of using a quadrature bridge of alternating current to determine the parameters of standards of electric capacity at industrial frequency by comparison with the parameters of standards of active resistance was noted. The advantage of using a bridge imbalance indicator with high input impedance is shown, which consists in the possibility of reducing the influence of higher harmonics of the supply voltages. An analysis of the well-known method of reducing of measurement errors caused by the deviation of the generator parameters from the calculated ones was carried out. It is shown that the known method does not provide sufficient compensation for the influence of these errors when the deviations of the generator parameters increase, as well as when the deviations of the bridge from the balance state increase. An iterative algorithm for calculating the measured deviation of the impedance ratio of the compared standards from the nominal value is proposed. Mathematical expressions for calculating the measured quantity are given. Calculations of the components of the measurement error for different values of generator voltage deviations were carried out. Calculations were performed for two variants of generator voltage variation implementation: multiplicative voltage amplitude variation and additive voltage phase variation. The developed iterative correction method allows to reduce the specified errors to the required levels in a small number of iteration steps - in the vast majority of cases, two steps are enough. The application of the method allows obtaining high metrological characteristics with rather large deviations of the voltage ratio of bridge generators, which makes it possible to reduce hardware costs when implementing quadrature alternating current bridges for comparing capacitance and active resistance standards. References 15, figure 1, table 1.","PeriodicalId":256678,"journal":{"name":"Tekhnichna Elektrodynamika","volume":"98 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140471802","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}

引用次数: 0

DETERMING AND ANALYSING PERFORMANCE CHARACTERISTICS OF HIGH-VOLTAGE ELECTROTECHNICAL SYSTEMS BASED ON A SERIES RESONANT LC-CIRCUIT WITH A HIGH Q-FACTOR 确定和分析基于高 Q 因子串联谐振 LC 电路的高压电工系统的性能特征

Tekhnichna Elektrodynamika Pub Date : 2024-01-31 DOI: 10.15407/techned2024.01.003

A. Shcherba, O. D. Podoltsev, N. Suprunovska, D. Vinnychenko

{"title":"DETERMING AND ANALYSING PERFORMANCE CHARACTERISTICS OF HIGH-VOLTAGE ELECTROTECHNICAL SYSTEMS BASED ON A SERIES RESONANT LC-CIRCUIT WITH A HIGH Q-FACTOR","authors":"A. Shcherba, O. D. Podoltsev, N. Suprunovska, D. Vinnychenko","doi":"10.15407/techned2024.01.003","DOIUrl":"https://doi.org/10.15407/techned2024.01.003","url":null,"abstract":"The paper analyzes the performance characteristics of the electrоtechnical system (ETS), built on the basis of a series high-Q resonant LC circuit and intended for diagnosing the isolation of high-voltage equipment. The frequency dependences of the parameters L and C elements of the resonant circuit were experimentally studied and it was shown that for both elements there is an optimal frequency at which the value of the element’s Q- factor reaches its maximum value. It was established that the Q-factor of the investigated circuit is determined mainly by the Q-factor of its inductance and reaches the maximum value QLC,max = 280 at the frequency f= 40 kHz. The Simulink model was developed for the analysis of the performance characteristics of the ETS in steady state. Graphical dependences are given, which allow to determine the level of voltage on the load for a given active resistance of this load, as well as the energy characteristics and the value of the efficiency of the ETS at the stage of its design. A Simulink model has also been developed to analyze the dynamic characteristics of the ETS when a breakdown of the diagnosed insulation occurs. It is shown that the breakdown of the insulation in the ETS, which has a series high-Q resonant circuit, will cause a rapid decrease in current by Q times, and not an increase in current to emergency values, as in an ETS based on high-voltage transformers. In this way, a fast-acting parametric stabilization of the output current is implemented in the ETS even in case of electrical breakdowns of the high-voltage insulation of the power equipment under diagnosis. Thus, the ETS implements high-speed parametric stabilization of the output current, which prevents the destruction of both the ETS and the diagnosed high-voltage insulation of power equipment even during its electrical breakdown. References 11, figures 9.","PeriodicalId":256678,"journal":{"name":"Tekhnichna Elektrodynamika","volume":"64 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140476523","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}

引用次数: 0

RESEARCH AND DEVELOPMENT OF THE ARC VOLTAGE PID-CONTROLLER MODEL DURING SURFACING 堆焊过程中电弧电压 PID 控制器模型的研究与开发

Tekhnichna Elektrodynamika Pub Date : 2023-11-13 DOI: 10.15407/techned2023.06.008

V. Solovyov, I.O. Ryabtsev, Yu.М. Lankin, I. Romanova

引用次数: 0

FEATURES OF CHANGING THE OPERATING STATES OF EXECUTIVE STRUCTURES OF MULTILEVEL RECTIFIERS 改变多电平整流器执行结构工作状态的特点

Tekhnichna Elektrodynamika Pub Date : 2023-11-13 DOI: 10.15407/techned2023.06.017

K. Lypkivskyi, A. Mozharovskyi

{"title":"FEATURES OF CHANGING THE OPERATING STATES OF EXECUTIVE STRUCTURES OF MULTILEVEL RECTIFIERS","authors":"K. Lypkivskyi, A. Mozharovskyi","doi":"10.15407/techned2023.06.017","DOIUrl":"https://doi.org/10.15407/techned2023.06.017","url":null,"abstract":"The main component of DC power supply systems are various semiconductor mostly controlled rectifiers with corresponding filter capacitors. In particular, these are multi-level rectifiers (MLRs) with a purposeful discrete-time change in the voltage transfer coefficient through a corresponding change in the operating state of its executive structure. Synthesized optimal variants of these structures are characterized by the high efficiency of the use of semiconductor switches elements. The work revealed and analyzed the peculiarities of the implementation of transitions between the specified operating states in two types of MLR – with a wide (full) and with a limited range of output voltage regulation. Taking into account these features made it possible to determine appropriate algorithms for discrete-time control of semiconductor switches elements of the MLR, which ensure an acceptable course of these transitions, during which the possibility of noticeable unwanted surges or drops in the voltage supplied to the consumer is practically excluded. The multivariate implementation of the algorithms for transitions between the output voltage levels of the MLR is another aspect of the multivariate transformer-and-switches executive structures of converters in general. References 10, tables 1, figures 5.","PeriodicalId":256678,"journal":{"name":"Tekhnichna Elektrodynamika","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139278401","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}

引用次数: 0

EFFICIENCY ANALYSIS OF ELECTROMECHANICAL CONVERSION SYSTEMS OF WIND TURBINES WITH AERODYNAMIC MULTIPLICATION 带空气动力倍增的风力涡轮机机电转换系统的效率分析

Tekhnichna Elektrodynamika Pub Date : 2023-11-13 DOI: 10.15407/techned2023.06.044

P. Andrienko, D. Alekseevskiy, O.V. Blyzniakov, O. Nemykina, I. Nemudriy

{"title":"EFFICIENCY ANALYSIS OF ELECTROMECHANICAL CONVERSION SYSTEMS OF WIND TURBINES WITH AERODYNAMIC MULTIPLICATION","authors":"P. Andrienko, D. Alekseevskiy, O.V. Blyzniakov, O. Nemykina, I. Nemudriy","doi":"10.15407/techned2023.06.044","DOIUrl":"https://doi.org/10.15407/techned2023.06.044","url":null,"abstract":"In this article, we have considered the state of development of high-power horizontal wind turbines. The most common wind turbines for operation with variable wind flow speed usually include a frequency converter to ensure the compatibility of generator with network. It leads to decrease in the efficiency of wind energy conversion system, while the use of direct connection of the generator to the axis of wind wheel leads to a significant increase in the weight and cost of the generator. The wind turbine with aerodynamic multiplication is an alternative to such systems. Its prototype with 750 kW power is manufactured and studied in Ukraine. This wind energy conversion system with the synchronous or induction generators offers the property to generate energy under optimal condition with invariable rotational speed of generator rotor within the wide range of variable speed of wind flow. In this case, it is not necessary to apply the frequency converter that contributes to increasing the efficiency and reducing the cost of wind turbine. As shown, the relative performances of mass, cost and efficiency of generators in proposed system comparatively to conventional one depend on the multiplication factor (i.e. ratio of the rotational speeds of wind turbine and generator). When the power of wind turbines is from 750 to 2500 kW, the multiplication factor is within the limits of 10.72 to 4.75. The theoretical and experimental study shows that the wind turbines with aerodynamic multiplication can be competitive as compared to conventional horizontal wind turbines. This article is aimed to comparative analysis of the quantitative and qualitative characteristics of the equipment used in high-power horizontal wind turbines with direct connection of generators to the axis of wind turbine and in wind turbines with aerodynamic multiplication. References 27, tables 1, figures 6.","PeriodicalId":256678,"journal":{"name":"Tekhnichna Elektrodynamika","volume":"311 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139278149","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}

引用次数: 0

SIMULATION OF ELECTRO-THERMAL PROCESSES IN THE INSTALLATION OF INDUCTION HEAT TREATMENT OF ALUMINUM CASTINGS AND DETERMINATION OF WAYS TO INCREASE ITS EFFICIENCY WHEN PRESSING WIRE ROD FOR POWER CABLES 模拟铝铸件感应热处理装置中的电热过程，确定在压制电力电缆线材时提高效率的方法

Tekhnichna Elektrodynamika Pub Date : 2023-11-13 DOI: 10.15407/techned2023.06.081

A. Zharkin, Y. Goryslavets, O. Glukhenky, V. V. Zolotaryov, R. Belyanin

{"title":"SIMULATION OF ELECTRO-THERMAL PROCESSES IN THE INSTALLATION OF INDUCTION HEAT TREATMENT OF ALUMINUM CASTINGS AND DETERMINATION OF WAYS TO INCREASE ITS EFFICIENCY WHEN PRESSING WIRE ROD FOR POWER CABLES","authors":"A. Zharkin, Y. Goryslavets, O. Glukhenky, V. V. Zolotaryov, R. Belyanin","doi":"10.15407/techned2023.06.081","DOIUrl":"https://doi.org/10.15407/techned2023.06.081","url":null,"abstract":"A computer mathematical model is presented for the study of electrothermal processes in the installation of induction heat treatment of cylindrical aluminum ingots during pressing of wire rod for the manufacture of aluminum wire for power cables. The model makes it possible to determine energetically and technologically appropriate electromagnetic and thermal modes of induction heat treatment of ingots at a given voltage on the inductor. The results of the study of a typical installation for heating aluminum blanks for the purpose of their subsequent gradient pressing using a single-phase single-layer cylindrical inductor made of a rectangular copper tube are presented. Temperature distributions along the length of the aluminum blanks, as well as in the cross-sections of the billets at the output of the inductor, were obtained. A slight difference in the calculated electromagnetic and thermal parameters from the similar parameters of the operating installation confirmed the adequacy of the developed model. Ways to increase the efficiency of the induction heating installation by optimizing the profile of the inductor turns are considered. The influence of the thickness of the wall of the copper tube of the inductor close to the workpiece on the efficiency of the installation was determined and it was shown that its optimal thickness is at the level of the depth of penetration of the electromagnetic field into the metal. The possibility of using a three-phase power supply of the inductor was also investigated and it was shown that in this case it is most appropriate to use a phase angle shift between voltages of 60 el. degree. References 10, tables 2, figures 7.","PeriodicalId":256678,"journal":{"name":"Tekhnichna Elektrodynamika","volume":"71 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139278225","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}

引用次数: 0

FEATURES OF MATHEMATICAL MODELING OF A LINEAR INDUCTION MOTOR WITH SHORT INDUCTOR AND SECONDARY 带短电感和次级的线性感应电动机数学建模的特点

Tekhnichna Elektrodynamika Pub Date : 2023-11-13 DOI: 10.15407/techned2023.06.023

V. Teriaiev, Anton Dovbyk, O. Zaichenko

引用次数: 0

STABILITY OF POWER SUPPLY CLOSED-LOOP SYSTEMS WITH PULSE-WIDTH MODULATION AND CONSIDERATION OF THE PULSATION FACTOR 脉宽调制供电闭环系统的稳定性及脉动因素的考虑

Tekhnichna Elektrodynamika Pub Date : 2023-11-13 DOI: 10.15407/techned2023.06.003

V. Y. Zhuikov, I. V. Verbytskyi, О.О. Abakumova, A. Blinov

引用次数: 0

FORMATION OF THE SCHEDULE OF THE HYDROPOWER OFFER FOR THE "DAY AHEAD" MARKET USING CONDITIONAL OPTIMIZATION METHODS WITH PENALTY FUNCTIONS 利用带惩罚函数的条件优化方法，为 "提前一天 "市场制定水电报价计划

Tekhnichna Elektrodynamika Pub Date : 2023-11-13 DOI: 10.15407/techned2023.06.071

Y. Parus, I.V. Blinov, D. Olefir

引用次数: 0

LOSSES OF ELECTRICITY CAUSED BY FLOWS OF RENEWABLE ENERGY SOURCES IN THE BALANCE OF ELECTRICAL GRIDS 电网平衡中可再生能源流动造成的电力损失

Tekhnichna Elektrodynamika Pub Date : 2023-11-13 DOI: 10.15407/techned2023.06.065

P. Lezhniuk, Iryna Hunko, О.І. Kozachuk, Vladyslav Lysyi

{"title":"LOSSES OF ELECTRICITY CAUSED BY FLOWS OF RENEWABLE ENERGY SOURCES IN THE BALANCE OF ELECTRICAL GRIDS","authors":"P. Lezhniuk, Iryna Hunko, О.І. Kozachuk, Vladyslav Lysyi","doi":"10.15407/techned2023.06.065","DOIUrl":"https://doi.org/10.15407/techned2023.06.065","url":null,"abstract":"Renewable energy sources (RES) affect the technical and economic parameters of electrical grids. In particular, with the increase in the amount of electricity in the EPS balance produced by RES, it is relevant to determine the power and electricity losses in electric grids caused by flows of electricity from RES. The method, algorithm and program for determining the component of power and electricity losses from RES in the total losses of electrical grids have been developed. The basis of the method is a mathematical model of the electrical grid for determining losses, which uses the current distribution coefficients in the circuits of the circuits from RES nodes and node voltages. As a result, a matrix of power loss distribution coefficients is formed in the branches of the circuit depending on the power in the nodes of the circuit. The voltages during the formation of the loss distribution matrix are determined based on the results of the calculation of steady-state modes of the electrical network or according to experimental measurement data. It is shown that the values of electricity losses in electrical grids caused by RES can be used during the operational planning of the electricity balance in the EPS and, since they are addressable, their cost can be compensated accordingly. References 8, figures 2.","PeriodicalId":256678,"journal":{"name":"Tekhnichna Elektrodynamika","volume":"29 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139278338","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}

引用次数: 0