Journal articles on the topic 'Electric power processes'
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1
Harrison, W. Leonard. "Electric power for industrial processes using dielectric heating." Power Engineering Journal 2, no. 2 (1988): 105. http://dx.doi.org/10.1049/pe:19880021.
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Astrakhantsev, Leonid, Natalya Ryabchyonok, Tatyana Alekseeva, Andrey Khomenko, and Aleksey Martusov. "Energy-efficient power regulators for electric railway vehicles." MATEC Web of Conferences 216 (2018): 02001. http://dx.doi.org/10.1051/matecconf/201821602001.
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This study aims at validation of the power regulation parameter for electric railway vehicles for effective use of electrical potential of energy sources. Based on analysis of electromagnetic processes with the use of suggested energy parameters and mathematical modeling method the assessment of energy efficiency was performed for semiconductor power regulators for alternating and direct current electric traction drives. Power balance and obtained mathematical equations for calculation of its components allow improving the education content of educational institutions due to eliminating methodological inconsistencies. The suggested technical solutions for continuous and full use of the electrical potential of overhead systems and self-generated power supply sources ensure their advantage in terms of structure, energy efficiency and electromagnetic compatibility.
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Nedelchev, Ivaylo, Hristo Zhivomirov, and Yoncho Kamenov. "A study of the transient processes in the physical model of the electric power systems with predominant part of the renewable energy sources." E3S Web of Conferences 286 (2021): 02009. http://dx.doi.org/10.1051/e3sconf/202128602009.
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The renewable energy take part in the most of the electric power systems in the modern world. The part of this type of energy in the global electric power system, as well as in the local scale, increases with the setting the stricter requirements for decreasing the level of the carbon dioxide emissions. This is the result of the newest international conventions and decision for saving the nature. By these conditions, the electric power systems are forced to work with more different types of energy sources: wind power, photovoltaic, biomass plants etc. Switching of such miscellaneous power sources, leads to complicated transient processes, which are developed due to specific electrical parameters, especially harmonic components, of the synchronous generators, photovoltaic and wind power plants. This paper represents data from measurements of the transient processes into the physical model of the electric power system with predominant part of renewable energy and assesses the applicability of the model. For conducting this study, the multichannel DAQ measurement system is used.
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Mihaylenko, V., J. Chunyak, and V. Bachinskiy. "Analysis of processes in converter with eleven zone regulation output voltage." POWER ENGINEERING: economics, technique, ecology, no. 3 (April 6, 2020): 35–40. http://dx.doi.org/10.20535/1813-5420.3.2020.228610.
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Analysis of the electromagnetic processes is organized beside this article in electric circuit with semiconductor commutator . Mathematical model is created for analysis electro-magnetic processes in semiconductor converter with width pulsed regulation of the output voltage. The broughted graphs, which reflect the electromagnetic processes in electric circuit. Method much parametric functions was used when performing calculation. The mathematical model of the converter is created for eleven zoned regulations of the output voltage. Article is devoted to the development of a method of multi-parametric modulating functions by means of working out of new mathematical models and definition of functions and the algorithmic equations for the analysis on sub- system components of electromagnetic processes in electric circuits of variable structure with sinusoidal, direct and pulsing voltage. Introduction of functions with discrete parameters in the algorithmic equations for analysis of processes in circuits with semiconductor commutators simplifies modeling on subsystem components. The mathematical model of steady-state processes and transients in electric circuits of semiconductor converters of modulation type with multi-channel zonal use of phase and line voltages of a three-phase network of power supplies is developed. The mathematical model of electric circuits of thyristor shapers of electro-discharge pulses for the analysis and the matching of capacitors charging modes with decrease several times of electric resistance of technological load is also created. The obtained results have a great value for development theoretical electrical engineering in a direction of simplification of calculations of electromagnetic processes in electric circuits with semi-conductor converters of the electric power. The Electromagnetic processes in electric circuit under width- pulse regulation possible to analyse with use the algorithmic equations multivariable function, which argument are a system parameters semiconductor commutator, signal of control, phases to network of the power supply and time. Introduction multivariable function with discrete parameter in algorithmic equations of the analysis formed and connecting processes in electric circuit of the variable structure allows to reflect change of this structure under system components, simplifying modeling and analysis of such processes to account of the generalization of the got equations. Except specified correlations and diagrams designed model allows to analyse forms of the output voltages and current of the separate power modules.
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Gotovych, Volodymyr, Oleg Nazarevych, and Leonid Shcherbak. "Mathematical modeling of the regular-mode electric power supply and electric power consumption processes of the organization." Scientific journal of the Ternopil national technical university 91, no. 3 (November 12, 2018): 134–42. http://dx.doi.org/10.33108/visnyk_tntu2018.03.134.
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Kostin, Mykola, Tetiana Mishchenko, and Oksana Hoholyuk. "The principle of creating a "smart" electricity meter in electric traction networks with stochastic electromagnetic processes." Computational Problems of Electrical Engineering 11, no. 1 (April 25, 2021): 12–19. http://dx.doi.org/10.23939/jcpee2021.01.012.
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Voltage and current are sharply variable random (stochastic) processes in traction networks of DC electric transport systems. As a result, electronic and hybrid electricity meters used in electric systems measure electric power with a large relative error that significantly exceeds that of their accuracy class. In this paper the principle of developing smart meters for accounting the electricity transmitted from traction substations to electric rolling stock through a traction network is proposed. Proposed ideas are developed on the basis of the random processes correlation theory. The meter operates in real time and monitors not a set of realizations of random voltage and current processes, but their deterministic characteristics, that is, time functions of mathematical expectations and variances which make up the background of its operating principle. The experimental implementation of the proposed principle has been conducted in the feeder zone of an A-B section of the GisDnieper Railway of Ukraine, where registration and processing of realizations of stochastic voltage and current processes obtained in real operation mode has been done. The ratios obtained for active and reactive power can be applied not only for traction power grids, but also for electric networks of external power supply of DC electric traction systems as the basis for the “smart meter” design.
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Ingarao, Giuseppe, Karel Kellens, Amar Kumar Behera, Hans Vanhove, Giuseppina Ambrogio, and Joost R. Duflou. "Electric Energy Consumption Analysis of SPIF Processes." Key Engineering Materials 549 (April 2013): 547–54. http://dx.doi.org/10.4028/www.scientific.net/kem.549.547.
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Manufacturing processes, as used for discrete part manufacturing, are responsible for a substantial part of the environmental impact of products, but are still poorly documented in terms of environmental footprint. A thorough analysis on the causes affecting the environmental impact in metal forming processes, especially the innovative but very energy intensive sheet metal forming technologies required to form light-weight products, is nowadays necessary. Therefore, this paper presents an energy consumption analysis, including a power and time study, of Single Point Incremental Forming (SPIF) processes. First, the influence of the most relevant process parameters (e.g. feed rate, step down) as well as the material forming itself are analysed regarding the power demand. Moreover, a comparative study and related energy efficiency assay are carried out on two different machine tools. As the forming time proves to be the dominant factor for the total energy consumption, from environmental point of view, the overall results show many similarities with conventional machining processes. Finally, this paper reports on some potential improvement measures to reduce the SPIF energy consumption.
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O, Melnichenko, Kulbovskyi I, Holub H, and Kharuta V. "ASPECTS OF THE METROLOGICAL PROVISION OF TECHNOLOGICAL PROCESSES OF INFORMATION AND MEASUREMENT SYSTEMS IN TRANSPORT INFRASTRUCTURE PROJECTS." National Transport University Bulletin 1, no. 46 (2020): 226–36. http://dx.doi.org/10.33744/2308-6645-2020-1-46-226-236.
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The article deals with the main methodological aspects of the metrological provision of information and measurement systems in transport infrastructure projects. The object of study is the means of information-measuring systems of electric power objects of transport of Ukraine. The purpose of the work is to study the metrological provision of information and measurement systems at electric power facilities, in particular transport, which allow to solve many problems related to registration of operating modes of power systems, determination of electrical and time parameters, finding damage on power lines, diagnostics of electrical equipment and others. The research method is a systematic analysis of the metrological assurance of reliable, economical and high-quality operation of electric power objects due to the introduction of synchronized measurements on large electric power objects at large electric power objects. The regulatory framework for metrological support is the State Standards and other documents of the State System for Ensuring Unity of Measurements, the relevant normative documents of the State Standard of Ukraine, methodical instructions and recommendations. The technical basis is the system of state standards and standard measuring instruments, which ensures their reproduction with the highest accuracy; a system of working standards and exemplary measuring instruments by means of which the sizes of units of physical quantities are transferred to the working measuring instruments. As well as a system of standard samples of the composition and properties of substances and materials, which ensures the reproduction of units, composition and properties of substances and materials. The purpose of metrological support is to improve quality, increase production efficiency, use of material values and energy resources, as well as scientific research. The most effective way to improve the reliability, economy and safety of power equipment is to use methods and techniques for technical diagnostics. Due to the use of monitoring systems for monitoring and diagnostics of the electrical parameters of the electric power objects of the railways, both the renewal time of the power supply (associated with the restoration of train traffic) and the corresponding economic losses caused by emergency shutdown are minimized, as well as the costs associated with the operational repair works to eliminate the effects of damage. The characteristics of digital registrars and monitoring systems offered by the leading manufacturers in the electricity market are regulated by international standards. The made comparisons of the accuracy of measurements of different devices for recording the parameters of the modes show similar indicators and confirm the possibility of using the system of monitoring the mode parameters in the problems of estimating the state of power systems. The results of the study can be used in technological processes in transport infrastructure projects when using digital devices as a measurement tool for parameter control and monitoring of electric networks both in Ukraine and abroad. KEYWORDS: METROLOGY, ANALYSIS, STANDARD, INFORMATION, INFORMATION AND MEASUREMENT SYSTEM, PROJECT, MANAGEMENT, TECHNOLOGICAL PROCESS.
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Burlov, Vyacheslav, and Maxim Polyukhovich. "System integration of processes of ensuring electric power networks safety under the conditions of impact of meteorological factors." E3S Web of Conferences 289 (2021): 01015. http://dx.doi.org/10.1051/e3sconf/202128901015.
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The problem of the influence of meteorological factors on electric power networks continues to be relevant. For the safe fulfillment of their purpose, electric power networks as an element of the electric power system must guarantee the safety, stability and efficiency of the electric power supply process. To solve the above problems, it is necessary to make decisions based on meteorological observations, since the safety of electric power networks depends on the timely forecasting of meteorological factors. The study examines the possibility of system integration of the process of ensuring the safety of electric power networks and the process of monitoring meteorological factors. In order to increase the level of safety of electric power networks, it is proposed to use a geo information system that collects, processes and transfers meteorological data.
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Мihaylenko, V., J. Chunyak, K. Trubitsin, and V. Bachynskiy. "MATHEMATICAL MODEL OF A TWELVE-PULSE CONVERTER WITH SIXTEEN ZONE CONTROL OF THE OUTPUT VOLTAGE AND ACTIVE-INDUCTIVE LOADS." Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 2, no. 37 (April 23, 2021): 68–72. http://dx.doi.org/10.31319/2519-2884.37.2020.13.
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Analysis of the electromagnetic processes is organized in this article in electric circuit with semiconductor commutator. Mathematical model twelve pulses of the converter is created for analysis of the electromagnetic processes in semiconductor converter with width-pulse regulation of the output voltage. The broughted graphs, which reflect the electromagnetic processes in electric circuit. Method multivariable function was used when performing calculation. The mathematical model of the converter is created for five zoned regulations of the output voltage. Using method multivariable function was found current and voltage of the load, as well as input currents of the converter. The load of the converter has actively inductive nature. Article is devoted to the development of a method of multi-parametric modulating functions by means of working out of new mathematical models and definition of functions and the algorithmic equations for the analysis on sub-system components of electromagnetic processes in electric circuits of variable structure with sinusoidal, direct and pulsing voltage. Introduction of functions with discrete parameters in the algorithmic equations for analysis of processes in circuits with semiconductor commutators simplifies modeling on subsystem components. The mathematical model of steady-state processes and transients in electric circuits of semiconductor converters of modulation type with multi-channel zonal use of phase and line voltages of a three-phase network of power supplies is developed. The mathematical model of electric circuits of thyristor shapers of electro-discharge pulses for the analysis and the matching of capacitors charging modes with decrease several times of electric resistance of technological load is also created. The obtained results have a great value for development theoretical electrical engineering in a direction of simplification of calculations of electromagnetic processes in electric circuits with semi-conductor converters of the electric power. The electromagnetic processes in electric circuit under width-pulse regulation possible to analyse with use the algorithmic equations multivariable function, which argument are a system parameters semiconductor commutator, signal of control, phases to network of the power supply and time. Introduction multivariable function with discrete parameter in algorithmic equations of the analysis formed and connecting processes in electric circuit of the variable structure allows to reflect change of this structure under system components, simplifying modeling and analysis of such processes to account of the generalization of the got equations. Except specified correlations and diagrams designed model allows to analyse forms of the output voltages and current of the separate power modules.
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Zhang, Li Xi, Shi Yuan Gao, and Wen Bin Chen. "Performances Comparison of Different Solar Desalination Processes by Bubbling Humidification." Advanced Materials Research 282-283 (July 2011): 584–88. http://dx.doi.org/10.4028/www.scientific.net/amr.282-283.584.
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Basing on the experiment and design data of the two solar desalination systems by bubbling humidification, the GOR (gain output ratio), R (electric power consumption of unit freshwater output) and C (freshwater production cost) are calculated and compared. It's obtained when the humidifying temperature is increased, GOR is increased, while R and C are decreased; if the humidifying temperature increased by 10°C, C would be reduced by half. The electric power consumptions of the systems mainly depend on the blower’s consumption, while the electric power consumed by seawater pumps is little. It is the guide and basis for reducing the freshwater production cost and further improving the rationality of process.
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Khvoshchan, O. V., and O. P. Smirnov. "DEPENDENCE OF ENERGY PROCESSES OF HIGH-VOLTAGE ELECTRIC-DISCHARGE BOREHOLE COMPLEXES "SKIF" ON CHARACTERISTICS OF LOADING." Tekhnichna Elektrodynamika 2022, no. 1 (January 24, 2022): 58–66. http://dx.doi.org/10.15407/techned2022.01.058.
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The work determines the dependences of electrical parameters of the ground and submerged parts of the charging unit of the electric-discharge borehole complex "Skif-100M" on peculiarities of changing of electrical characteristics of the active and reactive load contributed by modern geophysical cables up to 10 km long with an active resistance from 24 to 644 Ohm, capacitance from 0.2 to 1.8 μF and inductance from 2.9 to 31 mH. New dependences and conditions to increase the charging power of storage capacitor, the output power of the complex and the voltage of ground part of its power supply from load parameters were determined on the basis of analysis of transients in the charging circuit of a complex. There were realized necessary energy characteristics for creation of a universal submersible charging unit to increase energy efficiency and productivity of high-voltage borehole electric-discharge complexes of "Skif" type. The obtained results provide effective modernization of the domestic submersible electric-discharge equipment of such complexes (in particular, their ground power sources and submersible charging units). This extends the scope of their application in the oil and gas industry of Ukraine and increases the attractiveness of investment of foreign companies engaged in the processing of oil wells in different countries of the world to the Ukrainian economy. References 11, figures 4, tables 3.
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APRELKOV, Ivan N. "Study Results of the Electrical Parameters of the High-Power "Ladle-Furnace" Unit and its Impact on the Power Supply Network." Elektrichestvo 3, no. 3 (2021): 33–43. http://dx.doi.org/10.24160/0013-5380-2021-3-33-43.
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The steel refinement and its chemical composition and temperature finalization processes in a pouring ladle carried out by heating the metal with electric arc have received wide use at modern metallurgical enterprises. The article considers the electrical operating conditions of the ladle furnace unit (LFU) equipped with a 40 MVA electric furnace transformer. It was expected that the LFU load would vary insignificantly, because the electric arc burns between the electrodes and the surface of already molten metal, without the occurrence of short circuits. However, the accomplished studies testify that the LFU load is abruptly variable and nonlinear in nature, and gives rise to significant voltage fluctuations and harmonic distortions in the power supply network. The flicker intensity (severity) factor has been estimated, and the level of current harmonic components generated due to LFU operation has been determined. By using the obtained results, it becomes possible to predict the influence of LFU electric operating conditions on the levels of electric power quality indicators in changing the power supply network parameters, and to adopt circuit engineering solutions for assuring the electric power quality in the plant electric power supply system.
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Vedenyev, K. E. "Managing Investment Programs оf Electric Power Companies." Vestnik of the Plekhanov Russian University of Economics, no. 3 (May 31, 2021): 168–77. http://dx.doi.org/10.21686/2413-2829-2021-3-168-177.
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In the situation of digitalization of finance and economic processes to create and increase values and investment appeal corporations are obliged to acquire new sources of capital stock, to build up accumulations and keep them on the optimal level. Investment programs of electric power companies are personified know-how with simultaneous administrative control over prices for products put out by them. Each company continuously looks for sources of long-term investment by developing investment strategies appealing for investors, for the development of own business and tries to earn finance, social capital and reputation. Electric power companies usually have a big share of state ownership, which is controlled with difficulties, especially when horizontal transfers of this ownership go on. The goal of the article is to substantiate the model of technological price control of investment processes at electric power companies, which stipulates evaluation of capital structure and accumulation processes and investment practice of efficiency support, first of all for protection of their interests. For companies investment is a key driver of development, it gives an opportunity to extend business, enter new markets, modernize production and equipment and change ideology of personnel, therefore, companies always do their best to attract investors. The target model of exercising technological and price control of the investment program at electric power companies demonstrates the necessary conditions of balancing dynamic pricing for company products, its securities and management strategy with capital value and keeping it on the optimum level when evaluating investment project efficiency. In world practice there is a sufficient number of methods and algorithms to control investment programs and business, however finance environment, methods and criteria of evaluation evolve and tools of audit and analysis change.
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Burkov, Anatoliy, Alexander Marykyn, Victor Nikityn, and Alexander Tretyakov. "PARALLEL OPERATION OF HYDROGEN POWER SOURCE WITH CURRENT INVERTER AND SYNCHRONOUS GENERATOR IN SELF-CONTAINED ELECTRIC-POWER SYSTEMS OF ALTRENATING CURRENT." Bulletin of scientific research results, no. 4 (December 17, 2017): 81–91. http://dx.doi.org/10.20295/2223-9987-2017-4-81-91.
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Objective: The data on the synthesis of a combined electric power source for a self-contained electric-power system with a diesel generator (turbo-generator) and hydrogen power source was presented in the article. Objective: To justify the structure and parameters of a power channel of a self-contained electric power plant based on power augmentation with parallel operation on the total load of two electric power sources – synchronous generator and hydrogen power source. Methods: Mathematical modeling of the main power processes was applied, including the processes of active and reactive power distribution control in a self-contained electric power system with parallel operation of synchronous generator and hydrogen power source. Results: The tasks of structural synthesis of a combined power plant with current-based electronic inverter application, as well as justifications of power-efficient operation criteria and control algorithms of a self-contained electric power system with minimized power interchange between synchronous generator and current inverter were set and solved. Practical importance: New results are recommended to use in the design of power systems with improved technical and economic as well
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Mikhalchuk, Nikolay. "PERSPECTIVE DIRECTIONS FOR THE IMPROVEMENT OF ENERGYOPTIMAL PARAMETERS AND TRACTION PROPERTIES OF THE LOCOMOTIVE." Bulletin of scientific research results, no. 4 (December 17, 2017): 161–73. http://dx.doi.org/10.20295/2223-9987-2017-4-161-173.
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Objective: To develop and justify energy-efficient and energy-saving control technology of traction electric drive with maximum realization of traction properties. Methods: Mathematical modeling, experimental manufacturing of prototypes of the converters and control system. Results: Theoretical justification was presented, based on refinement of the theory of energy processes in electrical circuits with solid state power controllers. It was proposed to apply electrical resistance of elements in electric power systems as a power control parameter instead of the conventional voltage. It was revealed that, in contrast to the existing analogues, semiconductor power regulators of different application with a new control parameter acquire the property of the electric variator. Technical solutions for manufacturing an innovative traction electric rolling stock were introduced with the use of advanced technical solutions of power control with adaptive control system that provides improved traction properties without shortening irreversible transformation of electric energy of power semiconductor devices. As an example, the solutions involving artificial intelligence in control systems of complex technical systems were presented, based on graphics processors, neural networks, providing parallel processing of large information arrays. Practical importance: Introduction of electric solid state variable speed with adaptive, intelligent control systems will significantly raise energy efficiency and improve the implementation of traction parameters of the locomotive.
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Badalyan, N. P., D. P. Andrianov, A. A. Mitrofanov, E. A. Chashchin, S. A. Balashova, and G. V. Maslakova. "Power flows in multi-junction power supply circuits." MATEC Web of Conferences 336 (2021): 01008. http://dx.doi.org/10.1051/matecconf/202133601008.
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The article discusses a methodology that allows for an accurate calculation of the parameters of electrical equipment from the point of view of optimizing the power supply system. Taking into account the characteristics of transients processes makes it possible to select equipment in maximum load modes. Modeling of power flows caused by changes in the load of consumers is carried out on the example of calculating the power supply circuit of five junctions. It is shown that it is possible to change the direction of flows of transmitted electric power at certain ratios of parameters in individual elements of the circuit. Purpose of research: to show the possibility of changing the picture of the transmitted capacities by the elements of the power supply system, depending on consumer loads.
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Urbaha, Margarita, Arnis Križus, and Deniss Kreisberg. "Ship Power System Analysis Based on Safety Aspects." Transport and Aerospace Engineering 4, no. 1 (August 1, 2017): 96–105. http://dx.doi.org/10.1515/tae-2017-0012.
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Abstract This article analyses the reasons for the reduction of insulating resistance, processes influencing them and isolation diagnostic methods. It provides a short description of electrical safety situation on ships with isolated neutral electrical power systems. It also covers the methods of protecting personnel from electric shock or preventing ignition or arching damage at the fault location with the help of fault current compensation. Principal fault current compensation circuit diagrams are analysed by using the minimum value and time of transient fault current as criteria.
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Kharlamov, Viktor, Pavel Shkodun, and Andrey Ognevsky. "Effect of transient processes on the switching stability of dc machines." MATEC Web of Conferences 239 (2018): 01036. http://dx.doi.org/10.1051/matecconf/201823901036.
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Effective use of fuel and energy resources is one of the main tasks in modern industry and transport. The main directions of increasing the energy efficiency of the electric rolling stock of railways are considered in the paper. For the electric rolling stock of railways, a significant proportion of electric power consumption falls on traction needs. The consumption of electrical energy and its recovery directly depends on the proper operation and fine-tuning of the magnetic system and switching of traction electric motors of the rolling stock. The methods of testing traction electric motors currently used in railway transport do not fully correspond to their operating modes during operation. For more reliable control of their condition, a methodology for estimating the nature of the operation of traction electric motors in conditions close to real ones was proposed. Studies of the influence of transient processes on the quality of switching of traction electric motors taking into account operating conditions are carried out. Based on the results of the study, the analysis of the data obtained is carried out, and a criterion for estimating the switching stability of traction electric motors in transient operation modes is proposed. The proposed criterion allows carrying out quality control of the tuning of the magnetic system and switching of the traction electric motor, and also estimating the nature of its operation in various modes, taking into account the operating conditions.
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BULATOV, Yury N., Andrey V. KRYUKOV, and Edward K. SHUMANSKY. "Application of Asynchronized Generators in Electric Networks with Degraded Electric Power Quality." Elektrichestvo 7, no. 7 (2021): 33–40. http://dx.doi.org/10.24160/0013-5380-2021-7-33-40.
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For decentralized power generation, small-capacity asynchronized generators (AGs) can be used, which are able to yield a number of positive effects in comparison with conventional synchronous machines: higher stability limits, wider reactive power adjustment ranges, simpler synchronization with the grid due to the ability to control the EMF phase, and the possibility to maintain synchronous operation in case of failure in one of the field windings. The article describes the model of a grid equipped with asynchronized generators with automatic excitation and rotor speed control systems, which is developed in the MATLAB software package environment. Normal and emergency operation modes of a 35 kV grid with distributed generation plants based on asynchronized machines under the conditions of degraded electric power quality due to the presence of electric traction loads are simulated. The influence of AGs on emergency and post-emergency modes are determined, and the harmonic distortion levels are estimated. For comparison, the grid operation modes are simulated for the case of using synchronous machines as generation sources. The influence of higher harmonic components on the performance of the proposed automatic control system is analyzed. The obtained study results have shown that with using asynchronized generators, better control processes and better quality of electric power are obtained in comparison with those in a grid equipped with synchronous machines; in addition, the stability limits are increased, and the synchronization processes are simplified.
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Кадацкий, А. Ф., and А. П. Русу. "Analysis of energy processes in pulse converters of AC electric power." Технология и конструирование в электронной аппаратуре, no. 1 (January 2015): 22–32. http://dx.doi.org/10.15222/tkea2015.1.22.
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Dmitriev, Nikolay Dmitrievich, Dmitriy Grigoryevich Rodionov, and Sergey Alekseevich Zhiltsov. "Optimization of management processes in the electric power industry based on mathematical modeling." KANT 38, no. 1 (March 2021): 17–23. http://dx.doi.org/10.24923/2222-243x.2021-38.4.
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The paper deals with the problems in the electric power industry, do not allow us to ensure a sufficient level of competitiveness of the industry and each individual subject of the electric power industry, the threatens national security, in particular, the economic security of the state, and creates barriers to maintaining the sustainable development of territories. It is proposed to use the economic and mathematical modeling allowed us to determine the high importance of human resources in the final results of the electric power company, which makes it possible to consider the optimization of investment funds from the position of strengthening the focus of management processes in the field of personnel development.
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Hasan, Maha Yousif, and Dheyaa Jasim Kadhim. "A new smart approach of an efficient energy consumption management by using a machine-learning technique." Indonesian Journal of Electrical Engineering and Computer Science 25, no. 1 (January 1, 2022): 68. http://dx.doi.org/10.11591/ijeecs.v25.i1.pp68-78.
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Many consumers of electric power have excesses in their electric power consumptions that exceed the permissible limit by the electrical power distribution stations, and then we proposed a validation approach that works intelligently by applying machine learning (ML) technology to teach electrical consumers how to properly consume without wasting energy expended. The validation approach is one of a large combination of intelligent processes related to energy consumption which is called the efficient energy consumption management (EECM) approaches, and it connected with the internet of things (IoT) technology to be linked to Google Firebase Cloud where a utility center used to check whether the consumption of the efficient energy is satisfied. It divides the measured data for actual power (A_p ) of the electrical model into two portions: the training portion is selected for different maximum actual powers, and the validation portion is determined based on the minimum output power consumption and then used for comparison with the actual required input power. Simulation results show the energy expenditure problem can be solved with good accuracy in energy consumption by reducing the maximum rate (A_p ) in a given time (24) hours for a single house, as well as electricity’s bill cost, is reduced.
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Bondar, Oleh, Mikola Kostin, Andrei Mukha, Olha Sheikina, and Svitlana Levytska. "Fryze reactive power of trams in effective stochastic recuperation processes." MATEC Web of Conferences 294 (2019): 01006. http://dx.doi.org/10.1051/matecconf/201929401006.
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Urban electric transport system, particularly tram systems, is not a direct current system not only in traction mode but in regenerative modes as both voltage on a collector and regenerative current are stochastic abruptly variable processes. The above- mentioned facts determine availability of Fryze’s reactive power in this system that flows from a railway substation to trams, leads to incidental losses of energy and significantly reduces its quality. So evaluation of power effectiveness of the system in electrical trams operation is impossible without determining the level of reactive power in this system. We have analytical expression of reactive power by Fryze. Numerical calculations for trams type T3D and T4D in regenerative braking modes are done. Probabilistic statistical data processing operation of reactive power expressions is done. It is determined that reactive power changes in the limit of 10…100 kilo-volt ampere reactive with mathematical expectation – 37,0 kilo-volt ampere reactive. Statistical allocation of random power values are different. Numerical calculations of incidental losses, energy of recuperation are done and they range supplementary – 20% from total losses. It is stated that coefficient of reactive power of system route of trams is exceeding permissible value 0,25.
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Chaban, Andriy, Marek Lis, Andrzej Szafraniec, and Vitaliy Levoniuk. "Mathematical Modelling of Transient Processes in a Three Phase Electric Power System for a Single Phase Short-Circuit." Energies 15, no. 3 (February 3, 2022): 1126. http://dx.doi.org/10.3390/en15031126.
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Field approaches are employed to develop a mathematical model of a power network section. The facility consists of two electric power subsystems described with ordinary differential equations and presented as concentrated parameter systems connected with a three-phase power supply line, presented as a distributed parameter system. The model of the electric power line is described with partial differential equations. Mathematically, the supply line model is described utilizing a mixed problem with explicitly indefinite boundary conditions. All electromagnetic state equations of the integrated system are introduced in their matrix-vector forms. The equation of the three-phase long supply line is expressed untraditionally as a system of two first-order differential equations as a function of long line voltage. Since the power supply line is part of the integrated system that includes two subsystems, the boundary conditions at the line’s start and end are implicitly defined, avoiding the traditional application of the Dirichlet first-type boundary condition. An expanded system of ordinary differential equations that describe physical processes in both the supply and loading subsystems is used to calculate the boundary conditions. To this end, third-type boundary conditions, or Poincaré’s conditions, serve to describe the wave equation of the electric power line. Such an integrated model of an electric power system helps analyse transient processes across the supply line when the electric power system is switched on and is single-phase short-circuited at the final point of the electric power line. A comparison of computer simulation results with well-known software packages shows a convergence of approx. 96%.
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Murshitha Shajahan, M. S., D. Najumnissa Jamal, V. Aparna, and M. K. A. Ahamed Khan. "Control of electric power generation of thermal power plant in TamilNadu." Case Studies in Thermal Engineering 12 (September 2018): 728–35. http://dx.doi.org/10.1016/j.csite.2018.08.008.
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Derkachev, S. V. "Microprocessor protection of electrical motors against phase failure in external power supply network." Vestnik IGEU, no. 1 (February 28, 2022): 46–53. http://dx.doi.org/10.17588/2072-2672.2022.1.046-053.
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Nonsymmetrical modes in the external power supply network during operation can be caused by several reasons: phase failure due to strong wind or glaciation of overhead power lines, wire burnout due to persistent short circuits, open phase automatic reclosing. In case of open phase condition, the external power supply network, synchronous and asynchronous electric motors are powered along the two phases that are in operation. It leads to the negative sequence current, which poses maximum danger for electric motors, since it causes additional heating and, as a result, premature damage. Therefore, the currently important goal of the project is to study transient processes of the motor load when an open phase mode occurs in the external power supply network and to design microprocessor protection of electrical motors against phase failure in the supply network. To achieve the goal, a computer simulation method is used, based on mathematical models of the elements of electrical network presented as the systems of differential equations in a three-phase coordinate system. The regularities of the flow of transient processes in synchronous and asynchronous electric motors in case of open phase modes in both the internal and external power supply networks have been established. Thus, it is possible to develop an algorithm of the operation of microprocessor protection of electrical motors against phase failure in the external power supply network. The proposed algorithm is based on monitoring the negative sequence current level and the absence of current in one of the phases at the section input. The obtained results show that the proposed algorithm to protect electrical motors against open phase modes in an external power supply network has a high selectivity. Its use as a starting element of the fast-acting automatic transfer switch device allows you to provide uninterrupted power supply for enterprises with a continuous technological process.
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Bezbozhnov, Oleg, and Denis Chadaev. "Smart Grid: Monitoring the Quality of Electric Power." NBI Technologies, no. 2 (April 2022): 5–10. http://dx.doi.org/10.15688/nbit.jvolsu.2022.2.1.
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The issues of monitoring the normalized parameters of electricity, in smart grid networks, as a means of ensuring control of the quality of electricity, are considered. In the context of constantly growing consumption of electrical energy, the most important task is its rational distribution and use. State-of-the-art prototypes of intelligent power distribution networks include means of controlling power distribution and consumption processes to ensure that these processes comply with applicable regulations. The purpose of our study is to create a monitoring device for normalized power quality parameters, such as voltage, signal shape, harmonic coefficient, with the possibility of detecting deviations of these parameters from the norm, with the possibility of transmitting the results obtained via infocommunication networks. The developed device allows collecting, analyzing and transmitting data on power quality indicators in the distribution electrical network, with their further use in order to manage energy supply and energy consumption in smart power supply systems, and improve the energy efficiency of power supply systems through the introduction of smart grid technologies. The device can be integrated into energy systems based on the smart grid concept, which are a single energy-information complex, as part of a situation assessment system and emergency automation.
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Amin, Massoud, and John Stringer. "The Electric Power Grid: Today and Tomorrow." MRS Bulletin 33, no. 4 (April 2008): 399–407. http://dx.doi.org/10.1557/mrs2008.80.
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AbstractIn the coming decades, electricity's share of total global energy is expected to continue to grow, I and more intelligent processes will be introduced into the electric power delivery (transmission and distribution) networks. It is envisioned that the electric power grid will move from an electromechanically controlled system to an electronically controlled network in the next two decades. A key challenge is how to redesign, retrofit, and upgrade the existing electromechanically controlled system into a smart self-healing grid that is driven by a well-designed market approach. Revolutionary developments in both information technology and materials science and engineering promise significant improvements in the security, reliability, efficiency, and cost effectiveness of electric power delivery systems. Focus areas in materials and devices include sensors, smart materials and structures, microfabrication, nanotechnology, advanced materials, and smart devices.
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Talalay, P. G., V. S. Zagorodnov, A. N. Markov, M. A. Sysoev, and J. Hong. "Recoverable autonomous sonde (RECAS) for environmental exploration of Antarctic subglacial lakes: general concept." Annals of Glaciology 55, no. 65 (2014): 23–30. http://dx.doi.org/10.3189/2014aog65a003.
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AbstractThe proposed RECoverable Autonomous Sonde (RECAS) will allow analysis and sampling of subglacial water while the subglacial lake remains isolated from the surface. The probe is equipped with two electrically heated melting tips, one on the bottom and one on the top of a cylindrical probe. When one of the tips is powered, the RECAS moves up or down similarly to a hot-point thermal electric drill. The electric power and signal cable is coiled inside the probe on an electric-motor-powered coil. When the lower tip is powered, the probe advances downwards by gravity. In order to move the probe up, power is applied to the upper heated tip and the coil motor pulls the cable, moving the probe upwards and melting the borehole above the probe. A conventional internal combustion engine electric generator on the glacier surface provides 9–10 kW of power to the RECAS via an umbilical cable stored in the probe. Electric power enables a penetration rate of 2.4–2.9m h–1, and thus 4–5 months will be required to reach a depth of 3500 m and return to the surface.
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Tomporowski, Andrzej, Józef Flizikowski, Weronika Kruszelnicka, Izabela Piasecka, Robert Kasner, Adam Mroziński, and Stepan Kovalyshyn. "Destructiveness of Profits and Outlays Associated with Operation of Offshore Wind Electric Power Plant. Part 1: Identification of a Model and its Components." Polish Maritime Research 25, no. 2 (June 1, 2018): 132–39. http://dx.doi.org/10.2478/pomr-2018-0064.
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Abstract This paper describes identification and components of destructiveness of energy, economic and ecologic profits and outlays during life cycle of offshore wind electric power plants as well as the most useful models for their design, assembly and use. There are characterized technical conditions (concepts, structures, processes) indispensable for increasing profits and/or decreasing energy, economic and ecological outlays on their operation as well as development prospects for global, European and domestic markets of offshore wind electric power industry. A preliminary analysis was performed for an impact of operators, processed objects, living and artificial environmental objects of a 2MW wind electric power plant on possible increase of profits and decrease of outlays as a result of compensation of destructiveness of the system, environment and man.
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Karpenko, S. M., N. V. Karpenko, and G. Y. Bezginov. "Forecasting of power consumption at mining enterprises using statistical methods." Mining Industry Journal (Gornay Promishlennost), no. 1/2022 (March 15, 2022): 82–88. http://dx.doi.org/10.30686/1609-9192-2022-1-82-88.
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Forecasting of electric power consumption with due account of assessed impact of various factors helps to make efficient technical and managerial decisions to optimize the electric power consumption processes, including preparation of bids for the wholesale electric power and capacity market. The article uses multivariate methods of statistical analysis and econometric methods based on time series analysis for model designing. The paper presents the results of developing the following models: a multifactor model of electrical power consumption using the regression analysis, the Principal Component Method with the assessment of the impact of production factors on electrical power consumption using elasticity coefficients, as well as the energy saving factor based on a variable structure model; trend additive and multiplicative forecast models of electrical consumption that take into account the seasonality factor, models with a change in trends, a linear dynamic model of electrical power consumption that takes into account the production output; a forecast adaptive polynomial model of electrical power consumption as well as the Winters model. The developed forecast models have a sufficiently high accuracy (accuracy of the MAPE was below 7%). The choice of the model type to forecast the electrical power consumption depends on the quantitative and qualitative characteristics of the time series, the structural relation between the series, the purpose and objectives of the modeling. In order to enhance the accuracy of the forecast it is required to regularly refine the model and adjust it to the actual situation with the due account of new factors and production trends while building different versions of scenarios and combined forecast models of electrical power consumption
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Hraniak, Valerii, Ihor Kupchuk, and Volodymyr Gontar. "METHOD AND DEVICE OF DIRECT AUTOMATED MEASURING CONTROL OF THE INSULATION OF THE WINDING OF ELECTRIC MACHINES." ENGINEERING, ENERGY, TRANSPORT AIC, no. 2(109) (August 27, 2020): 129–37. http://dx.doi.org/10.37128/2520-6168-2020-2-14.
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Today, the vast majority of technological processes, both production and agriculture, are based on the use of electric machines. Among which, a significant part of production equipment requires the use of electric motors, the power of which exceeds hundreds of kilowatts. Such electric machines have also become widespread as generating equipment, where they are an integral part of power plants, both using traditional energy sources (thermal power plants, nuclear power plants, etc.), and renewable (hydroelectric power plants, wind farms, etc.), where the unit power of a single electrical machine is usually higher than in other sectors of economy. When operating such equipment, systems for monitoring a significant number of technological parameters are often used, and in real time it characterizes the modes of their operation. This approach makes it possible to increase the reliability of operation and, with a fairly high probability, to avoid large-scale man-made threats that can be caused by an emergency failure of power electric machines (including powerful electric generators), which are quite often accompanied by the destruction of supporting structures, structural elements of industrial premises and can pose a threat to the life and health of production personnel. But the use of even the most modern systems for monitoring the technical condition does not provide one hundred percent reliability, and when operating electrical machines with a nominal power of the order of units of MW and below, their use can significantly increase the total cost of equipment with a still quite high level of occurrence of a serious man-made accident. Therefore, the development of direct methods and means for measuring the technical parameters of electrical machines in general, and insulation parameters in particular, is an urgent scientific and applied problem. In the article was proposed a new method of direct automated measuring control of insulation of windings of an electric machine, based on the use of combined signals to determine the technical parameters of the insulation of electrical machine units. And also, the design of the measuring control has been developed, it implements the proposed method.
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Bulgakov, Alexander. "The simulation solution of nonlinear problems of ergodic electric-power processes transformation." MATEC Web of Conferences 113 (2017): 01001. http://dx.doi.org/10.1051/matecconf/201711301001.
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Kostin, Mykola. "Electrodynamics of electric power transmission and losses in devices of electric transport systems." MATEC Web of Conferences 180 (2018): 01003. http://dx.doi.org/10.1051/matecconf/201818001003.
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For the first time, the “field” approach for explaining the processes of transmission and generation of electric power losses in devices of electric transport systems is described and theoretically substantiated on the basis of the theory of electromagnetic field. The results of the solution of the system of electromagnetic field equations show that it is energetically appropriate to design low-floor types of electric rolling stock. A qualitative view of electric power flows arriving through the air of the feeder zone from the traction substation and entering to the electric rolling stock through the roof and the front part of its body is presented. It is established that the main flow of energy enters through the roof porcelain insulator. At the same time, the electromagnetic waves partly penetrate into the metal surfaces of roof and frontal part of the body, and partially they are reflected from them creating losses of active power. The results of calculations of these losses, power factor and reactive power factor of the electric locomotive roof are shown. The relation between the standing waves, formed in the feeder zone, and the reactive power consumed by the electric rolling stock is established.
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Zakharova, Anastasiya A., and Alexander N. Komkov. "Simulation of Electric Drive Self-Start of Head Units at the Oil Pumping Station." Electrotechnical Systems and Complexes, no. 2(43) (June 28, 2019): 35–42. http://dx.doi.org/10.18503/2311-8318-2019-2(43)-35-42.
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The article is concerned with the issues related to the implementation of the group self-starting electric drives of the head pump units at the oil pumping station. Since oil pumping stations are high-risk facilities, this problem is particularly urgent for them because of the stringent requirements for the continuity of the processes of pipe-wire transportation of oil and oil products. The self-start of a group of electric drives of mixed composition in the ETAP software package for the existing oil pumping station has been studied and simulated. The task of ensuring the self-starting of electric motors of precisely a large unit power is considered in order to study their mutual influence on each other. As a result of conducting multiple model experiments, the values of the voltage of static stability and the time of dynamic stability of the electrical system of the enterprise were determined. On the basis of the data obtained, the boundary of the dynamic stability of the system has been built, the optimal conditions for the implementation of group self-starting have been determined, compliance with which allows uninterrupted operation of oil pumping stations during voltage dips in the external power supply system. Particular attention is paid to assessing the settings and the selectivity of existing devices for relay protection and automation since only with their correct detuning, self-starting can expand the area of stable operation of the electrical system and keep electric drives of main pumping units in operation after power failures. On the basis of the performed analysis, a variant of protection of the minimum voltage was proposed taking into account all the features of the implementation of self-starting electric drives of mixed composition at the pump station under consideration. The absence of an abrupt change at the time of dynamic stability is established for an electrical system of mixed composition with electric drives of high unit power at comparable powers of asynchronous and synchronous motor loads. The bifurcation point on the border of dynamic stability is preserved.
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Polyukhovich, Maxim, Vyacheslav Burlov, Victor Mankov, and Amangeldy Bekbayev. "Electric power supply management of the construction site in the interests of facilitating electrical safety." E3S Web of Conferences 140 (2019): 08006. http://dx.doi.org/10.1051/e3sconf/201914008006.
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A critical resource in construction work is electricity. Various problems that can lead to a breakdown of the electric power supply to the construction site can arise during its active operation. The basis of the activity is the decision of the person. Activity is based on the model. The dependence of human activity on electrical energy has formed the need to ensure uninterrupted electric power supply. To solve the complex problem of electric power supply, it is necessary to develop a theory. A properly constructed theory has three levels, three components: methodology, methods, technology. The decision maker (DM) perceives the world around him and carries out his activities through processes. A process is an object in action at a fixed purpose. A constructive methodology should form the condition for the existence of a process with which the DM works. The goal of research is to select and justify the conditions for the existence of the electric power supply process in the interests of guaranteed achievement of the goal of the industrial safety.
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Sheshukov, Oleg Y., Ilya V. Nekrasov, Andrey V. Syvtsov, Mikhail M. Tsymbalist, Aleksandr I. Stepanov, Denis K. Egiazar’an, and Vladimir V. Kataev. "Electric Characteristic of Steel-Making Electric Furnace and the Process Control." Applied Mechanics and Materials 268-270 (December 2012): 1376–79. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.1376.
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The article gives analysis of long-term and perspective tasks of automating EAF, particularly relevant to the conditions of domestic production. The results of studies on quality control of foaming slag in the super-power EAF-135 OJSC "Seversky Pipe Plant" are shown. We made the conclusions about the possibilities of using the electrical mode parameters for the operational control of the processes of smelting steel and ferroalloys.
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Reyes, Alberto, L. Enrique Sucar, Pablo H. Ibargüengoytia, and Eduardo F. Morales. "Planning Under Uncertainty Applications in Power Plants Using Factored Markov Decision Processes." Energies 13, no. 9 (May 6, 2020): 2302. http://dx.doi.org/10.3390/en13092302.
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Due to its ability to deal with non-determinism and partial observability, represent goals as an immediate reward function and find optimal solutions, planning under uncertainty using factored Markov Decision Processes (FMDPs) has increased its importance and usage in power plants and power systems. In this paper, three different applications using this approach are described: (i) optimal dam management in hydroelectric power plants, (ii) inspection and surveillance in electric substations, and (iii) optimization of steam generation in a combined cycle power plant. For each case, the technique has demonstrated to find optimal action policies in uncertain settings, present good response and compilation times, deal with stochastic variables and be a good alternative to traditional control systems. The main contributions of this work are as follows, a methodology to approximate a decision model using machine learning techniques, and examples of how to specify and solve problems in the electric power domain in terms of a FMDP.
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Karpenko, Sergey, and Nadezhda Karpenko. "Analysis and modeling of regional electric power consumption subject to influence of external factors." Energy Safety and Energy Economy 3 (June 2021): 12–17. http://dx.doi.org/10.18635/2071-2219-2021-3-12-17.
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Electric power consumption along with a large variety of factors affecting it can be forecasted and modelled by using econometric forecasting methods, including time series and correlation and regression analysis. For the purpose of this research, electric power consumption in the Moscow Region, Russia, was modelled with consideration of economic and climate factors based on 2019–2020 power usage data. A multiplicative model for regional electric power consumption and correlations between electric power consumption and an air temperature as well as a total number of cloudy days a month were built. The results will be helpful for analyzing and forecasting of processes involved in power consumption.
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Sanchez Garciarivas, Rafael, Diego Rasilla Gonzalez, Javier Agustin Navarro, Luis Arturo Soriano, José de Jesús Rubio, Maria Victoria Gomez, Victor Garcia, and Jaime Pacheco. "VSC-HVDC and Its Applications for Black Start Restoration Processes." Applied Sciences 11, no. 12 (June 18, 2021): 5648. http://dx.doi.org/10.3390/app11125648.
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System reliability is a measure of an electric grid system’s ability to deliver uninterrupted service at the proper voltage and frequency. This property of the electric system is commonly affected by critical processes, such as a total blackout. The electric system restoration is a complex process which consists of returning generators, transmission system elements, and restoring load following an outage of the electric system. However, the absence of a generator or unit of black start capabilities may worsen the duration and effects of blackouts, having severe consequences. Black start capability is important as it can reduce the interruption time, decrease the economic loss, and restart the power supply fast and efficiently. In recent years, several works have reported advances about the High Voltage Direct Current (HVDC) technology based on the Voltage-Source Converter (VSC) as an attractive and promising technology to increase black start capability. This paper is a review of the current studies of VSC-HVDC as black start power and discusses the advantages and limitations of recent methods. The major points addressed in this paper are as follows: the current theoretical approach of the black start process and the used HVDC technologies, the advantages of VSC-HVDC as black start power, a compressive review of the literature about the black start capabilities using VSC-HVDC technologies, and a description of the main methods recently used to provide an enhancement for restoration processes. Finally, this paper discusses new challenges and perspectives for VSC-HVDC links in order to provide an enhancement for restoration processes.
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Dolgikh, Nadezhda N., Elena A. Dyuba, and Dmitry S. Osipov. "Development of a recursive model for the calculation of transient processes in electric networks using the wavelet transformation." Yugra State University Bulletin 18, no. 1 (May 10, 2022): 59–66. http://dx.doi.org/10.18822/byusu20220159-66.
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The digital transformation of the electric power industry is one of the priority tasks for the development of the industry. Wavelet transform is widely used in the electric power industry to analyze the dynamics of complex non-linear non-stationary processes. The article proposes a method for calculating transient processes in electrical networks based on a recursive algorithm. The approximating and detailing wavelet coefficients of the discrete wavelet transform are used as the voltage signal. To select the optimal wavelet function, it is proposed to use a criterion that takes into account the accuracy of the signal recovery as a result of the inverse wavelet transform. The nature of the change in the calculation result with an increase in the number of iterations is shown. The results of a numerical experiment for a 110 kV network when calculating a three-phase short circuit showed an acceptable accuracy of the developed technique. The proposed technique makes it possible to compress the volume of transmitted digital data on normal and emergency modes of electrical networks.
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Gonzalez-Abreu, Artvin-Darien, Roque-Alfredo Osornio-Rios, Arturo-Yosimar Jaen-Cuellar, Miguel Delgado-Prieto, Jose-Alfonso Antonino-Daviu, and Athanasios Karlis. "Advances in Power Quality Analysis Techniques for Electrical Machines and Drives: A Review." Energies 15, no. 5 (March 5, 2022): 1909. http://dx.doi.org/10.3390/en15051909.
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The electric machines are the elements most used at an industry level, and they represent the major power consumption of the productive processes. Particularly speaking, among all electric machines, the motors and their drives play a key role since they literally allow the motion interchange in the industrial processes; it could be said that they are the medullar column for moving the rest of the mechanical parts. Hence, their proper operation must be guaranteed in order to raise, as much as possible, their efficiency, and, as consequence, bring out the economic benefits. This review presents a general overview of the reported works that address the efficiency topic in motors and drives and in the power quality of the electric grid. This study speaks about the relationship existing between the motors and drives that induces electric disturbances into the grid, affecting its power quality, and also how these power disturbances present in the electrical network adversely affect, in turn, the motors and drives. In addition, the reported techniques that tackle the detection, classification, and mitigations of power quality disturbances are discussed. Additionally, several works are reviewed in order to present the panorama that show the evolution and advances in the techniques and tendencies in both senses: motors and drives affecting the power source quality and the power quality disturbances affecting the efficiency of motors and drives. A discussion of trends in techniques and future work about power quality analysis from the motors and drives efficiency viewpoint is provided. Finally, some prompts are made about alternative methods that could help in overcome the gaps until now detected in the reported approaches referring to the detection, classification and mitigation of power disturbances with views toward the improvement of the efficiency of motors and drives.
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Kurz, Rainer. "Natural Gas." Mechanical Engineering 133, no. 04 (April 1, 2011): 52. http://dx.doi.org/10.1115/1.2011-apr-7.
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This article discusses the importance of gas turbines, centrifugal compressors and pumps, and other turbomachines in processes that bring natural gas to the end users. To be useful, the natural gas coming from a large number of small wells has to be gathered. This process requires compression of the gas in several stages, before it is processed in a gas plant, where contaminants and heavier hydrocarbons are stripped from the gas. From the gas plant, the gas is recompressed and fed into a pipeline. In all these compression processes, centrifugal gas compressors driven by industrial gas turbines or electric motors play an important role. Turbomachines are used in a variety of applications for the production of oil and associated gas. For example, gas turbine generator sets often provide electrical power for offshore platforms or remote oil and gas fields. Offshore platforms have a large electrical demand, often requiring multiple large gas turbine generator sets. Similarly, centrifugal gas compressors, driven by gas turbines or by electric motors are the benchmark products to pump gas through pipelines, anywhere in the world.
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Sozontov, Andrey, Maria Ivanova, and Arthur Gibadullin. "Implementation of artificial intelligence in the electric power industry." E3S Web of Conferences 114 (2019): 01009. http://dx.doi.org/10.1051/e3sconf/201911401009.
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The article deals with the possibility of the implementation of artificial intelligence, which will improve the efficiency of national economy, including the energy industry. The paper presents the principles of using neural networks and elements of artificial intelligence in the processes of production, transmission and consumption of electricity. It has been revealed that the use of artificial intelligence in the electric power industry will make it possible to minimize disruptions in power supply.
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Kotsur, I. M., A. V. Hurazda, B. A. Dolia, and L. E. Shestov. "An energy efficient electric drive of air units." Electrical Engineering and Power Engineering, no. 1 (March 31, 2021): 18–25. http://dx.doi.org/10.15588/1607-6761-2021-1-2.
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Purpose. Improving the efficiency and energy performance of an asynchronous electric drive for stationary fan’s units of the main ventilation line of mines.
Methodology. The research was carried out using the methods of the theory of electrical circuits, mathematical physics, simulation, interpolation and approximation
Findings. The research of electromagnetic and energy processes in the asynchronous electric drive system with pulse control at a fan load, taking into account the variable aerodynamic parameters of the main ventilation line of mines. An electric drive system is able to respond with high accuracy and reliability to changes in the aerodynamic parameters of the main ventilation line of mines has been proven. This will also increase the power factor of the electric drive at a fan load up 0.8 to 0.93 p.u., and the efficiency up 92.5% to 94.5%, when regulating in the range of the operating slip of the rotor of the drive fan motor = 0.5 ÷, which, respectively, is on average up 0,25% to 40 higher in comparison with systems of an unregulated electric drive. Recommendations has been developed for the design and rational selection of the rated fan capacity for the main ventilation line to advance the best energy efficiency level of the electric drive.
Originality. The research of electro-mechanical, electro-energy power and aerodynamic processes in the dynamic modes of the fan electric drive was carried out. The fan-loaded "induction motor-converter" system has been proven to be self-regulating. It is able to respond with high accuracy and reliability even at low switching frequencies of the power chopper to any changes of the aerodynamic parameters of the main ventilation line of mines.
Practical value. Recommendations has been developed for the design and rational selection of the rated fan capacity for the main ventilation line to advance the best energy efficiency level of the electric drive.
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Lezhnyuk, Petro, Iryna Hunko, Juliya Malogulko, Iryna Kotylko, and Lіudmyla Krot. "MODELING OF COMPATIBLE WORK OF DISTRIBUTED POWER SOURCES OF ELECTRIC POWER AND CENTRALISED POWER SUPPLY." TECHNICAL SCIENCES AND TECHNOLOG IES, no. 2 (12) (2018): 189–95. http://dx.doi.org/10.25140/2411-5363-2018-2(12)-189-195.
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Urgency of the research. Current trends of distributed generation development in Ukraine indicate a rapid generation in-crease from renewable energy plants. Most developed countries gradually refuse from the fossil fuels use and invest more and more to the “green” energy. Therefore, there is a need for a detailed study of the operation conditions of distributed energy sources due to their instability, as well as the processes that arise in distribution electric networks with diverse types of distributed energy sources. Target setting. In the producing process of power energy by distributed energy sources due to the increase in their num-ber, there are situations where several renewable sources of energy operate to only one system of buses. Thus, such distributive networks acquire the features of a local power system, which complicates the control process of such systems, and also there is a problem with the electricity supply of consumers. Actual scientific researches and issues analysis. The analysis of publications suggests that in literature more attention is paid to studying the operating modes of solar power plants, or small hydroelectric power plants. However, almost no attention was paid to the study of their cooperation work. Uninvestigated parts of general matters defining. Only a few works are devoted to the study of the cooperation of the diverce sources of distributed energy sources in the local electrical systems. That is why, their impact on power distribution networks and on the grid in general has not been studied extensively. The research objective. In this article was considered the influence of asynchronous generators on small hydroelectric power plants on the operation modes of distribution electrical networks, and were investigated the processes that are occurring in local power systems with different types of distributed energy sources. The statement of basic materials. Based on the research results, was developed a computer model of a such system in the PS CAD software environment. Two solar stations and one small hydroelectric power station with an asynchronous generator were connected to the power supply. It was shown the simulation of two modes of operation: a joint operation of a small hydroelectric power station, two solar power stations and a power supply center; a joint operation of a small hydroelectric pow-er plant, two solar power stations and a power supply disconnected. Conclusions. As a result of computer simulation, it is shown that by switching on a small hydroelectric power plant with an asynchronous generator in the case of an emergency shutdown of centralized power supply, it is possible to restore the work of solar power plants, and thus partially or completely restore the power supply of consumers.
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Saidova, Mukhabbat, Nodir Urinov, and Leonid Schwarzburg. "Development of the model of automatic control of energy intensity of technological processes and its application." IOP Conference Series: Earth and Environmental Science 839, no. 5 (September 1, 2021): 052031. http://dx.doi.org/10.1088/1755-1315/839/5/052031.
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Abstract The article covers the model for automatic compensation of reactive component of consumed current of asynchronous motors operating at powers lower than the nominal values. Automated control system for individual compensation of reactive component of power consumption have been designed, which is connected directly to asynchronous electric motors of machine tools.
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Zagirnyak, M., A. Kalinov, and M. Maliakova. "Analysis of instantaneous power components of electric circuit with a semiconductor element." Archives of Electrical Engineering 62, no. 3 (September 1, 2013): 473–86. http://dx.doi.org/10.2478/aee-2013-0038.
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Abstract Both a classical instantaneous power method and a method based on equations of instantaneous power orthogonal components balance have been used to analyze power processes in electric circuits with semiconductor elements. Automated method of forming instantaneous power harmonic components was used to obtain analytical expressions and numerical values of instantaneous power components of analyzed electric circuits. A coefficient for estimation of a semiconductor converter nonlinearity degree has been offered.
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Afanasyev, V. V., V. G. Kovalev, and V. A. Tarasov. "Energy technology complexes as regulators of electrical power systems." Power engineering: research, equipment, technology 21, no. 5 (December 17, 2019): 50–58. http://dx.doi.org/10.30724/1998-9903-2019-21-5-50-58.
Full textAbstract:
The aim of the work is to study the processes of electrothermal gasification of solid fuels in energy technological complexes and to assess the possibilities of using energy technological complexes for regulating load schedules of electric power systems. By the methods of mathematical and physical modeling of physicochemical processes of gasification of solid carbon- containing materials and energy conversion, the main characteristics of electro-technological complexes for the processing of solid carbon-containing materials are obtained. A technological scheme of a maneuverable consumer of electricity and power is proposed, allowing to participate in demand management and increase the efficiency of electric power systems, comprehensively process any solid types of fuels, and build municipal gasification systems for areas that do not have access to natural gas sources. It is shown that the energy potential of the synthesis gas obtained by thermoelectric gasification in electrode installations is several times higher than the cost of electricity for gasification. During the hours of maximum load of the power system, the electrothermal gasifier allows to significantly reduce the consumed active power due to the transition to the autothermal gasification mode without reducing the performance of synthesis gas and work in the “market of system services” as a regulated load. Electrotechnological electrode installation allows the use of cheap electric energy of nighttime minima for the production of synthesis gas and the recovery of ferroalloys from oxides of raw materials and ore materials to be added to the coal recovery process. Electrode electrothermal installation provides a wide range of regulation of consumed electrical power, good process controllability for any type of raw materials, including combustible solid waste. High-temperature reduction processes in electrothermal gasifiers make it possible to process fuel of any composition without enrichment and grinding, to convert the mineral part of solid fuel into slag, which can be used to produce building materials. The oxides of a number of metals contained in the mineral part of the fuel are reduced and form a ferroalloy.