Electrical Engineering & Electromechanics最新文献

{"title":"APPLICATION OF MAGNETORHEOLOGICAL ELASTOMERS FOR PERFORMANCE CONTROL OF CUSHIONING SYSTEMS FOR WHEELED VEHICLES","authors":"V. Dushchenko, V. G. Maslіev, R. Nanivskyi, A. O. Maslіev","doi":"10.20998/2074-272x.2019.5.09","DOIUrl":"https://doi.org/10.20998/2074-272x.2019.5.09","url":null,"abstract":"The purpose of the work is to study the influence of the control of the elastic and damping characteristics of the cushioning system based on the use of magnetorheological elastomers on the smoothness of the course of wheeled transport vehicles. The technique. The research used the methods of: magnetic field theory, the theory of vehicle suspension, experiment theory planning, and the FEMM code for studying magnetic field characteristics and mathematical modeling of wheeled vehicle movement along roughness in the Delphi environment. Results. Designed, researched and patented designs of elastic hinges of the suspension arms with magnetorheological elastomers. The relative boundaries of changes in the elastic modules and losses of these hinges are determined when controlling the characteristics of the suspension in order to improve the smoothness of the wheeled vehicle. Scientific novelty. For the first time, the feasibility of using magnetorheological elastomers to control the elastic and damping characteristics of the cushioning system of wheeled vehicles has been investigated, and the requirements for control laws have been determined, which make it possible to increase smoothness by more than 40 %; it is established that the control of the loss modulus has a greater effect on the improvement of smoothness of motion than the control of the elastic modulus. Practical value. The design has been developed and the relative boundaries of changes in the modules of elasticity and loss of hinges with magnetorheological elastomers during their control have been determined, which will make it possible to formulate requirements for elastomers when developing promising hinge designs for vehicle suspension systems. References 21, figures 18.","PeriodicalId":44198,"journal":{"name":"Electrical Engineering & Electromechanics","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68225067","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":"REACTIVE POWER CONTROL IN MICRO-GRID NETWORKS USING ADAPTIVE CONTROL","authors":"A. Moghayadniya, E. Razavi","doi":"10.20998/2019.5.11","DOIUrl":"https://doi.org/10.20998/2019.5.11","url":null,"abstract":"Purpose. Despite their economic and environmental benefits, distributed products in power systems have caused problems in power systems. One of the most important issues in this regard is voltage fluctuations and frequencies in Micro-grids, which depends on several factors, such as variable consumption load and errors in power systems. One of the main challenges associated with the use of Micro-grids is power management among distributed generation sources. Power management plays a pivotal role in numerous Micro-grids and may ensure the stable and improved performance of Micro-grids in the permanent status of the system. The present study aimed to examine the power control in Micro-grids by proposing an adaptive control method along with the PID controller for power management and coordination in Micro-grids. This coordination system operates between production sources and controlling the voltage and frequency levels against the possible disturbances occurring anywhere in the system loop. The results of the simulation of the proposed algorithm in MATLAB software environment exhibited a high success rate (i.e., proper response to the fluctuations in the Micro-grid) and extremely low error rate (i.e., proper reactive power in the grid).","PeriodicalId":44198,"journal":{"name":"Electrical Engineering & Electromechanics","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46108421","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":"CALCULATION OF ELECTROMAGNETIC FIELDS IN INHOMOGENEOUS MEDIA FOR SELECTION OF PROTECTIVE COATINGS","authors":"M. Rezinkina","doi":"10.20998/2074-272x.2019.5.05","DOIUrl":"https://doi.org/10.20998/2074-272x.2019.5.05","url":null,"abstract":"The aim of the work is to develop a method for high-frequency EMFs calculation in terms of the modified vector potential and to use it for choice of the parameters of the layered absorbing coatings that provide effective absorption of radio wave radiation. Methodology . A method for calculation of electromagnetic fields in inhomogeneous media is described. It is performed in terms of the modified magnetic potential at presented a plane electromagnetic wave as an incident and reflected one. To reduce the computational domain size, additional uniaxially perfectly matched layers ensuring fast and non-reflective attenuation of electromagnetic field (EMF) strengths are used at its boundaries. It is supposed that electrical parameters of such layers have not only resistive, but also magnetic losses. Results . Modification of the known methods for dividing the wave into the incident and reflected, as well as introducing uniaxially perfectly matched layers at the domain boundaries and formulation of the problem in terms of the modified vector potential, provide a possibility to solve the problem of the electromagnetic wave incidence onto heterogeneous media at reduced memory and counting time compared to the formulation tasks through the EMF strengths. Practical value . The described method was used to select parameters of radio-absorbing coatings, application of which on conductive bodies reduces the reflections from them of the incident electromagnetic waves. This provides a possibility to choose the electrical parameters of layered coatings with active losses, as well as magnetic losses, which provide a decrease of the reflected waves amplitude by an order of magnitude or more. Originality . For the first time, the problem of calculating the incidence of an electromagnetic wave on an inhomogeneous medium with active electrical and magnetic losses was formulated in terms of the modified vector potential. The parameters of a multilayer lossy coating, which ensures decrease of the reflected EMF wave strengths by an order of magnitude or more are determined.","PeriodicalId":44198,"journal":{"name":"Electrical Engineering & Electromechanics","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46305644","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 EFFECT OF THE ACTIVE RESISTANCE OF THE PULSE TRANSFORMER WINDINGS ON THE PARAMETERS OF VOLTAGE PULSES GENERATED ON A CAPACITIVE LOAD","authors":"A. Gurin, I. Kostiukov","doi":"10.20998/2074-272x.2019.5.08","DOIUrl":"https://doi.org/10.20998/2074-272x.2019.5.08","url":null,"abstract":"Goal. Analysis of the influence of the active resistance of the primary and secondary windings of a pulse transformer on the voltage at the load capacitance based on the developed methodology for the analysis of transients caused by the discharge of the storage capacitance in the primary winding. Methodology. A model for calculating transients is developed using the Laplace transform. Transient modeling is carried out in the MATLAB software package. The results of transient calculations are compared with experimental results. Results. A method for calculating transients in test installations with pulse transformers has been developed, which allows taking into account the effect of power losses in the primary and secondary windings on the voltage at the load capacitance. The calculated relations are obtained, allowing to take into account the influence of the active resistance of the primary and secondary windings of the transformer on the voltage at the load capacitance, the currents in the primary and secondary windings of the transformer, as well as on the voltage drop on the inductance of the primary winding of the transformer. Scientific novelty. A mathematical model is developed for calculating transients in the primary and secondary windings of a pulse transformer, taking into account the influence of the active resistance of the windings when it changes over a wide range of possible values. Practical value. Using the proposed technique, it is possible to determine the parameters of the discharge circuit at which test voltage pulses are formed on the load capacitance without distorting the shape of the pulse front.","PeriodicalId":44198,"journal":{"name":"Electrical Engineering & Electromechanics","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49416301","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":"PERFORMANCE COMPARISON OF MULTICELL SERIES AND NPC MULTILEVEL CONVERTERS FOR A STATCOM","authors":"S. Belakehal, A. Djellad, R. Chenni","doi":"10.20998/2074-272x.2019.5.10","DOIUrl":"https://doi.org/10.20998/2074-272x.2019.5.10","url":null,"abstract":"Abstract. In this paper, we present a comparative study of the performances of the multicells series and the Neutral-Point-Clamped (NPC) three-level converters used at synchronous static compensators (STATCOM) for the control of the voltage at a point of the network. The analysis consists on a mathematical modeling, a pulse width modulation (PWM) control algorithm application and a simulation using the Matlab Simulink environment. The simulation results obtained show that the STATCOM allows the regulation of the voltage at the point of common coupling (PCC) by acting the reactive energy that it can supply or absorb.","PeriodicalId":44198,"journal":{"name":"Electrical Engineering & Electromechanics","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45041929","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":"PECULIARITIES OF CALCULATING STATIONARY HEATING OF WINDINGS OPERATING IN COMPLEX FORCED CONTROL SYSTEMS","authors":"E. Baida, M. Clemens, B. Klymenko, O. Korol, M. Pantelyat, P. Pustovoitov","doi":"10.20998/2074-272x.2019.5.02","DOIUrl":"https://doi.org/10.20998/2074-272x.2019.5.02","url":null,"abstract":"General description of the research topic. A technique and an algorithm for calculating the thermal field of electromagnets operating in complex forced systems proposed by authors are considered. The widespread use of such devices in electromechanical switching devices allows not only to increase their speed but also significantly reduce the size, mass and energy losses, which indicates the relevance of this topic. The mathematical model of heating the windings of forced electromagnets proposed by the authors is a system of 1D differential equations of stationary heat transfer in a cylindrical coordinate system, supplemented by equations of electrical and magnetic circuits. This model allows to take into account the ripple of the currents in the windings and the losses in the magnetic core due to these ripples, contains certain signs of scientific novelty and represents the goal of the paper . The algorithm developed by the authors for calculating the thermal field of electromagnets operating in forced control systems is a complex iterative cycle. Its implementation is greatly simplified by using the Maple computing environment which allows to realize complicated and cumbersome mathematical transformations, automates the process of computations, and obtain results of numerical simulation in a convenient tabular and/or graphic form, which indicates the practical significance of this works. The results of comparison of computation results with experimental data presented in the paper indicate the adequacy of the model and algorithm proposed.","PeriodicalId":44198,"journal":{"name":"Electrical Engineering & Electromechanics","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41888497","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":"AN ANTHOLOGY OF THE DISTINGUISHED ACHIEVEMENTS IN SCIENCE AND TECHNIQUE. PART 51: ROCKET-SPACE TECHNOLOGY DESIGNER SERGEY KOROLEV AND HIS ACCOMPLISHMENTS IN MISSILE DESIGN","authors":"M. I. Baranov","doi":"10.20998/2074-272x.2019.5.01","DOIUrl":"https://doi.org/10.20998/2074-272x.2019.5.01","url":null,"abstract":"Purpose. Preparation of short scientifically-historical essay about one of founders of domestic rocket production and practical cosmonautics, distinguished Soviet designer of space-rocket technology Sergey Pavlovich Korolev. Methodology. Known scientific methods of collection, analysis and analytical treatment of scientific and technical information, touching becoming and development in the world of space-rocket technique and resulted in scientific monographs, journals and internet-reports. Results. A short scientifically-historical essay is presented about the distinguished Soviet designer of space-rocket technique S.P. Korolev, becoming one of founders of domestic rocket production and practical cosmonautics. The important deposit of former German people, creating rockets, workings in the USSR after completion of the World War II is marked, in development of the first Soviet ballistic rockets. Basic scientific and technical achievements of talented and purposeful scientist and practical worker, becoming in 1950 a Chief Designer of the Special Design Bureau No. 1 (SDB-1), S.P. Korolev in area of creation of Soviet strategic rocket weapon (rocket-nuclear «shield») and modern space-rocket technique for mastering of near and distant space tellurians. It is pointed out that under the direction of the Chief Designer of SDB-1 S.P. Korolev in the USSR was developed and accepted on the armament of Soviet Army consisting of two stages intercontinental ballistic rocket (ICBR) of type P-7 (1956, military index 8K71, by power of thermonuclear war-head in 5 Mt and distance of its flight in 8 thousands km) with the liquid rocket engines (LRE) of type РД-107 and РД-108 of design of distinguished Soviet designer in area of rocket engines V.P. Glushko. It is indicated that the Chief Designer S.P. Korolev is the «father» of domestic space-rocket technique, providing by powerful launch vehicles, created in the USSR on the basis of ICBR with LRE of РД-7 type (military index 8K71), start of first in the world of Soviet space satellite (on Octobers, 4, 1957) and start on the circumterrestrial space orbit of the first in history humanity of Soviet cosmonaut Yu.A. Gagarin (on April, 12, 1961). Originality. Certain systematization is executed of known from mass medias of scientific and technical materials, touching becoming and development in the USSR of rocket production, at the sources of which the talented scientist-practical worker and distinguished Soviet designer of space-rocket technique S.P. Korolev. Practical value. Scientific popularization and deepening for the students of higher school, engineer and technical and scientific workers of physical and technical knowledge in area of history of becoming and development in the former USSR of modern rocket production, extending their scientific and technical range of interests and further development of scientific and technical progress in society. References 25, figures 10.","PeriodicalId":44198,"journal":{"name":"Electrical Engineering & Electromechanics","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45998567","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":"ERROR ELIMINATION FOR CURRENT CONTROL LOOP FOR MULTI-FUNCTIONAL SINGLE-PHASE GRID-CONNECTED INVERTER","authors":"O. O. Shavelkin, V. Kaplun, I. Shvedchikova","doi":"10.20998/2074-272x.2019.4.05","DOIUrl":"https://doi.org/10.20998/2074-272x.2019.4.05","url":null,"abstract":"Purpose. Elimination of the error of the inverter current control loop by improving its structure and justifying the parameters, which will ensure compliance with the current quality standard at the common coupling to the distribution grid of the load and the multi-functional grid inverter at the output of the renewable source of electrical energy. Methodology. Synthesis of structure of current control loop based on analysis of processes in electrical circuits and computer simulation. Results. Relationships for determining the input voltage of the inverter, reactor inductance and modulation frequency in accordance with the grid voltage, the maximum values of the inverter current and the amplitude of its ripple when combining the function of the active power filter. Dependencies of the amplitude of the pulsations of the output current of the inverter and the errors in the fundamental harmonic in accordance with the voltage at the input of the inverter, the modulation frequency and inductance of the output reactor are obtained. Originality. The structure of the inverter current control loop has been improved with a combination of proportional, integrating and differentiating links, and their parameters have been determined to ensure compensation of the disturbing action on input of the reference and compensation of the error of current from the disturbing action of the grid voltage regardless of its value. Practical value. The obtained solutions are the basis for the design of converters of electric power systems with renewable sources of electricity with improved energy efficiency. References 10, figures 7.","PeriodicalId":44198,"journal":{"name":"Electrical Engineering & Electromechanics","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48249614","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":"HIGH VOLTAGE POWER LINES MAGNETIC FIELD SYSTEM OF ACTIVE SHIELDING WITH COMPENSATION COIL DIFFERENT SPATIAL ARRANGEMENT","authors":"B. Kuznetsov, T. Nikitina, I. Bovdui","doi":"10.20998/2074-272x.2019.4.03","DOIUrl":"https://doi.org/10.20998/2074-272x.2019.4.03","url":null,"abstract":"Aim. The synthesis of single-circuit system of active shielding of magnetic field, generated by group of high voltage power lines, with different spatial arrangement of shielding coil. Methodology. The synthesis is based on the decision of a multi-criteria stochastic game, in which the vector payoff is calculated on the basis of the Maxwell equations solutions in the quasi-stationary approximation. The game decision is based on the stochastic multiagent optimization algorithms by multiswarm particles. The initial parameters for the synthesis of active shielding system are the location of the high voltage power lines with respect to the shielding space, geometry and number of shielding coils, operating currents, as well as the size of the shielding space and normative value magnetic flux density, which should be achieved as a result of shielding. The objective of the synthesis of the active shielding system is to determine their number, configuration, spatial arrangement, wiring diagrams and shielding coils currents, setting algorithm of the control systems as well as the resulting of the magnetic flux density value at the points of the shielding space. Results. Three variant of single-circuit robust system of active shielding with different spatial arrangement of shielding coil synthesis results for reduction of a magnetic field generated by group of high voltage power lines is given. The possibility of a significant reduction in the level of magnetic flux density of the magnetic field source within and reducing the sensitivity of the system to uncertainty of the plant parameters is given. Originality. For the first time carried out the synthesis, theoretical and experimental research of the robust system of active shielding of magnetic field generated by group of high voltage power lines with different spatial arrangement of compensation coil. Practical value. Practical recommendations from the point of view of the practical implementation on reasonable choice of the spatial arrangement of shielding coil of robust single-circuit system of active shielding of the magnetic field generated by the group of high voltage power lines is given.","PeriodicalId":44198,"journal":{"name":"Electrical Engineering & Electromechanics","volume":"24 5","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41310464","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":"IDENTIFICATION OF TECHNOLOGICAL DEFECTS IN HIGH-VOLTAGE SOLID INSULATION OF ELECTRICAL INSULATION STRUCTURES ON THE CHARACTERISTICS OF PARTIAL DISCHARGES","authors":"G. Bezprozvannych, A. G. Kyessayev, I. Mirchuk, A. V. Roginskiy","doi":"10.20998/2074-272x.2019.4.08","DOIUrl":"https://doi.org/10.20998/2074-272x.2019.4.08","url":null,"abstract":"Определены возможные значения напряжения начала частичных разрядов для модели цилиндрического воздушного зазора вблизи токопроводящей жилы силового кабеля. Показано, что при одинаковых приложенных напряжениях к высоковольтной изоляции в последнем случае активизируются воздушные включения меньшей толщины в сравнении с плоской конструкцией. На основании результатов проведенных испытаний силового кабеля на напряжение 3 кВ установлено, что грубые технологические дефекты в толще изоляции отсутствуют. Амплитуда разрядов в воздушных включениях не превышает 10 пКл при приложенном испытательном напряжении 5 кВ частоты 50 Гц. Показана эффективность выявления технологических дефектов в твердой композитной корпусной изоляции статорной обмотки турбо- и гидрогенераторов. Установлено, что в макетах, изоляция которых выполнена лентами меньшей толщины, технологические дефекты расположены в толще изоляции. Для макета, изоляция которого выполнена лентами большей толщины, технологические дефекты в виде расслоения расположены на границе раздела проводник – композитная изоляция.","PeriodicalId":44198,"journal":{"name":"Electrical Engineering & Electromechanics","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41976715","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}