Subjects -> ENERGY (Total: 414 journals)
    - ELECTRICAL ENERGY (12 journals)
    - ENERGY (252 journals)
    - ENERGY: GENERAL (7 journals)
    - NUCLEAR ENERGY (40 journals)
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ELECTRICAL ENERGY (12 journals)

Showing 1 - 12 of 12 Journals sorted alphabetically
CES Transactions on Electrical Machines and Systems     Open Access   (Followers: 1)
CPSS Transactions on Power Electronics and Applications     Open Access   (Followers: 3)
CSEE Journal of Power and Energy Systems     Open Access   (Followers: 1)
Electrical Engineering and Power Engineering     Open Access   (Followers: 3)
Electrochemical Energy Reviews     Hybrid Journal   (Followers: 3)
IEEE Open Journal of Power Electronics     Open Access   (Followers: 11)
IEEE Power and Energy Technology Systems Journal     Open Access   (Followers: 4)
IEEE Transactions on Transportation Electrification     Hybrid Journal   (Followers: 3)
Journal of Microwave Power and Electromagnetic Energy     Hybrid Journal   (Followers: 3)
Journal of Power Electronics     Hybrid Journal   (Followers: 6)
Journal of Power Sources Advances     Open Access   (Followers: 1)
KnE Energy     Open Access  
Similar Journals
Journal Cover
Electrical Engineering and Power Engineering
Number of Followers: 3  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1607-6761 - ISSN (Online) 2521-6244
Published by Zaporizhzhia National Technical University Homepage  [2 journals]
  • Starting and stopping as energokinematic regimes of electric drives of
           indus-trial mechanisms

    • Authors: D.I. Rodkin, О.А. Khrebtova, N.V. Zachepa, Yu.V. Zachepa
      Pages: 8 - 17
      Abstract: Purpose. To analyze the current technical terms that correspond to the physical processes in the electric drive system during atypical dynamic modes. Review possible modes in the kinematic parts of the electric drive during dynamic modes that may affect the nature of the transients. To form a definition of technical terms that characterize the real energy-kinematic regimes when moving and starting the electric drive of industrial mechanisms, which were not previously considered as insignificant or as non-existent. Methodology. In order to solve the set tasks, the analysis of the technical terms defined by the technical literature, GOST, DSTU, etc. was carried out. To formulate new terminology for physical processes of atypical modes, the analysis of physical and energy processes occurring in the electrical and kinematic parts of the electric drive under such dynamic modes is performed.. Findings. Possible cases of atypical modes of operation of kinematic circuits and energy channels of energy conversion during the start-up of electric drives of technological mechanisms under load, for the characteristics of which there is no technical terminology, are identified. Based on the results of the analysis of energy-kinematic regimes, technical terminology is proposed, which fully covers and characterizes the considered atypical processes that take place during the moving and start-up of technological mechanisms. Originality. For the first time, technical terminology has been proposed that characterizes the energy-kinematic modes of electric drives of technological mechanisms during start-up. Practical value. For the first time, the use of technical terms is proposed for a clear and visual representation of energy kinematic modes that occur during the moving and start-up under load of different types of technological mechanisms.
      PubDate: 2022-06-30
      DOI: 10.15588/1607-6761-2022-2-1
       
  • Peculiarities of overhead crane movement mechanism operation when powered
           by a basbar's trolley at action of higher current harmonics

    • Authors: M.І Kotsur, Yu.S. Bezverkhnia, D.S. Yarymbash, І.М. Kotsur
      Pages: 18 - 29
      Abstract: Purpose. Analysis and research of interconnected electromagnetic processes between electric drives of overhead crane moving mechanism and trolleys under conditions of higher current harmonics, taking into account design features, nonlinearity of magnetic and electrophysical properties of materials, proximity effects, surface and external surface effects. Methodology. The research was carried out using methods of electromagnetic field theory, electrical circuit theory, mathematical physics, solving a system of first order differential equations, interpolation, approximation and regression analysis. Findings. A simulating model of interrelated electromagnetic processes between electric drives of an overhead crane mechanism and current-conducting elements of the power supply system of an overhead crane has been developed. Investigations of electromagnetic processes between the electric drives of the overhead crane mechanisms and the trolleys have been carried out. The laws of voltage losses in the busbar's trolleys from the torque of the asynchronous electric drive have been established. This allowed to determine the maximum permissible distance of overhead crane movement to the feeding point of the busbar's trolley section, at which trouble-free operation is ensured as well as to determine the number of feeding points of the busbar's trolley sections and the distance between them. This will ensure the same level of voltage losses and active losses in the trolleys at the fundamental harmonic, and taking into account the higher harmonics of the load current. Originality. .A simulating model of interrelated electromagnetic processes between electric drives of an overhead crane mechanism and current-conducting elements of the power supply system of an overhead crane has been developed. which allows to use integrated parameters of busbar trolleys according to field calculation taking into account skin effect, the shape and location of tires (trolleys) in the busbar, the distances between them and the number of phases of the busbar, depending on the peculiarities of the modes of operation of the electric drive and the distance of the bridge crane to the power point of busbar trolley sections Practical value. Based on the theoretical research, recommendations to reduce voltage losses and active losses in the trolley from the action of higher harmonic loads to the level of voltage losses and active losses at the fundamental harmonic current have been developed.
      PubDate: 2022-06-30
      DOI: 10.15588/1607-6761-2022-2-2
       
  • Investigation of energy characteristics of the electromechanical control
           system of 4-drive electric vehicle

    • Authors: Viktor Brylystyi
      Pages: 30 - 37
      Abstract: Purpose. To determine for the developed electromechanical control system of a 4-drive electric vehicle, the power of the drives and the coefficients of the gearboxes that ensure the minimum energy consumption during acceleration from 0 to 100 km / h in 5 s. Research methods. Mathematical analysis and modeling. Findings. The proposed solution is to determine, for a given vehicle dynamics (acceleration from 0 to 100 km / h in 5 s), by mathematical modeling, values of drive powers and gear ratios, which increase the efficiency of the electromechanical system. The condition for increasing the efficiency is to minimize the consumption of electrical energy for acceleration. The developed computer model of the electromechanical control system of the 4 - drive electric vehicle allows to carry out researches on definition of electromechanical parameters of the control system providing the minimum energy consumption at dispersal from 0 to 100 km / h for 5 s. The current consumed by the drives was determined by studying the energy characteristics of the drives obtained on a previously developed laboratory stand. Gear ratios and drive power have been found to provide minimum power consumption when accelerating a 4-wheel drive electric vehicle. From the obtained data it is seen that for each power studied there are minima in the range of gear ratios 1-3,4. Also in the course of the research it was found that among the studied powers of 30-160 kW there is a drive that uses less energy. For the studied electric vehicle, these are four drives of 75 kW with a reduction factor of 3,3. The presence of minima in the interval between the gear ratios and the interval of the studied drive powers is explained by the variability of the engine efficiency in the load ranges varying from 0.3 to 2 times and the engine shaft speed of 0-3000 rpm, due to varying degrees of loss impact, the dynamic modes of the drive. Originality. The study of energy characteristics based on the developed control system for a 4-wheel drive vehicle makes it possible to find the electromechanical parameters of the system that provide a minimum of energy consumption during acceleration from 0 to 100 km/h in 5 s. Practical value. The electromechanical parameters of the control system of the 4-drive electric vehicle obtained as a result of research allow to receive economy of electric energy at dispersal from 0 to 100 km / h for 5 s in 2-3% within one experimental nominal power of the engine.
      PubDate: 2022-06-30
      DOI: 10.15588/1607-6761-2022-2-3
       
  • Calculation of the electronic loading scheme for testing low voltage
           sources

    • Authors: R.V. Zaitsev, M.V. Kirichenko, K.O. Minakova, R.S. Tomashevskii, V.O. Nikitin, M.M. Kharchenko
      Pages: 38 - 48
      Abstract: Purpose. The introduction of electronic load for testing high-precision low-voltage sources (solar panels) requires careful review not only of the circuit design, but also thermal and mechanical design. The article considers the principle of creating and calculating the optimal solution for the implementation of electronic load. Methodology. To achieve this goal, methods of analysis of modern electronic database, calculations of basic physical and electrical parameters and their modeling are used. Findings. Based on the considered physical and circuit solutions for the implementation of the electronic load unit, a corresponding electrical circuit was developed. The transistors are controlled by four unipolar operational amplifiers integrated into the LM324 chip. Control of the electronic load unit is implemented by controlling the voltage at the positive feedback terminals, which is further stabilized by the TL431 chip. The device is powered by a source of DC stabilized current of 12 V (provides additional filtering from voltage fluctuations). Originality. Modern advances in the development of solar cells and other low-voltage energy sources have led to the need to create compact and express systems for testing them, which cannot be implemented on existing solutions. Practical value. Adherence to the indications and principles set out in this article will provide the load with the ability to work at high power, while maintaining good performance and reliability. The developed scheme allows to create a compass device for express testing of solar panels.
      PubDate: 2022-06-30
      DOI: 10.15588/1607-6761-2022-2-4
       
  • Simulation of the electric field of a polymeric insulator bushing to
           determine the field concentration points

    • Authors: S.Y. Shevchenko, D.A. Danylchenko, Y.A. Vyazovichenko, A.E. Potryvai, V.N. Tsyupa
      Pages: 49 - 57
      Abstract: Purpose. The use of modeling as a tool that allows you to identify design weaknesses in electrical equipment and, on their basis, perform its optimization in order to level weaknesses due to design imperfections. Designation of a real problem in the design of polymer bushings, which negatively affects their technical, economic and operational characteristics and makes them less competitive compared to other types of insulators. Methodology. Analysis of experiments to detect partial discharges, simulation of electric field strength, synthesis of analyzed works and simulation results. Findings. As a result of the performed scientific research, it was found that the process of partial discharges has a direct effect on the electrical strength of the polymer bushing insulator. This fact is taken as the basis for searching for methods of further influence on the design of the insulator in order to increase its service life. It was found in the work that the reason for the occurrence of partial discharges is the uneven distribution of the electric field strength. This was the reason for further study of the electric field strength of the pass-through insulator and its modeling. As a result of the simulation, points of concentration of the electric field strength in the bushing polymer insulator were found and designated as points of action to increase the electrical strength of the bushing polymer insulator. Originality.  The scientific novelty of the performed research work lies in the use of the simulation of the electric field of a polymer bushing as a tool for detecting weak points in its design, when exposed to which, a positive effect on its technical characteristics can be observed. Practical value.  The practical value of the research work done is that the results of the research serve as a solid foundation for further optimization of the design of polymer bushings, which will lead to a positive impact on their technical characteristics and make them competitive compared to other types of insulators.
      PubDate: 2022-06-30
      DOI: 10.15588/1607-6761-2022-2-5
       
  • Energy saving at energy-intensive enterprises

    • Authors: Valerii Dubrovin, Larysa Deineha, Valerii Laktionov
      Pages: 58 - 68
      Abstract: Purpose. Investigate the methods of decision-making in the project portfolio management, as well as perform their software implementation as part of the system of the portfolio management optimization of energy saving projects at energy-intensive enterprises. Methodology. To achieve this goal, Markovitz's portfolio theory was chosen - the theory of financial investment, in which the methods of optimization are the most profitable distribution of the risk of the securities portfolio and income valuation. In combination with portfolio theory, methods were used to find the maximum Sharpe coefficient and minimum volatility according to randomly generated portfolios. Findings. Methods of portfolio management of energy saving projects are considered through their generalization to the methods of optimization of investment portfolios, but taking into account the specifics of the subject area. A software application has been developed and tested that automatically downloads data for certain stocks for a certain period from an electronic resource, generates random portfolios and optimizes them by maximizing the Sharpe ratio and minimizing portfolio volatility. Composing a portfolio of investments from four stocks traded on the stock exchange, the return and risk of the portfolio with different types of optimization were calculated. The application implements graphical display of portfolio optimization results in the form of tables and graphs. The first graph shows the changes in each stock over a given period of time. The following is a graph of daily profitability instead of actual prices, where you can see the volatility of shares. The simulated portfolio optimization based on the effective limit is graphically presented - the line along which the points will give the least risk to the target return and the calculated optimization of the portfolio based on the effective limit. The graphs and tables built by the program allow the user to better assess the created portfolio of the energy saving project. Originality. The approach proposed in this paper is a combination of methods for optimizing the investment portfolio according to Markovitz's portfolio theory and methods for finding the maximum Sharpe coefficient and minimum volatility in one software application to solve a wide range of problems. Practical value. The completed development has significant practical value, as it allows you to optimize quickly the financial portfolio for any assets, which allows, among other things, to use the system to optimize the management of portfolios of energy saving projects in energy-intensive enterprises. In addition, it can be the basis or model for a similar development.
      PubDate: 2022-06-30
      DOI: 10.15588/1607-6761-2022-2-6
       
 
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