scholarly journals Justification of the Parameters of a DC/DC Converter for an Autonomous Power Supply Source

2020 ◽  
Vol 20 (4) ◽  
pp. 86-95
Keyword(s):  
Power Supply ◽  
Electric Power Industry ◽  
Active Phase ◽  
Input Voltage ◽  
Energy Storage Devices ◽  
Supply Source ◽  
Power Sources ◽  
Storage Devices ◽  
Voltage Change ◽  
Power Supply Source

As the Smart Grid concept has become a part of the electric power industry development, DC/DC conver­ters have turned into a matter of increased interest. This is due to their effective coordination in the DC-bus system operating different types of power sources, including renewable ones and energy storage devices (batteries, supercapacitor modules), and various loads. The article analyzes switch mode power supply DC/DC converters for autonomous power supply systems. The application of the SEPIC (Single Ended Primary Inductance Converter) type converter is substantiated. The techniques of determining the parameters of the converter are presented. The active phase at the duty cycle operation has been demonstrated, and justified in accordance with the theoretical behavior in response to an input voltage change above and below the desired output value. A simulation of the converter's operation in the buck and boost modes in order to stabilize the output voltage at a set level has been performed in the MATLAB / Simulink package. The obtained simulation results show the effectiveness of the suggested solution for an autonomous power supply source.

scholarly journals Automatic System of Synchronous Connection of Backup Power Supply Source in Power Systems with Motor Load

2020 ◽  
Vol 20 (4) ◽  
pp. 36-42
Keyword(s):  
Power Systems ◽  
Power Supply ◽  
Automatic System ◽  
Supply Source ◽  
Power Sources ◽  
Industrial Enterprises ◽  
Experimental Stand ◽  
Asynchronous Motors ◽  
Power Supply Source ◽  
Fast Acting

We developed an automatic system of synchronous connection of a backup power supply source in power systems with synchronous and asynchronous motors in case of power loss from the main source. Here, we propose performing continuous monitoring of the instantaneous voltage values of the main and backup power sources and determining the angle between them. The time to send the command to turn the backup power switch on is determined on the basis of the results of approximating the dependence of the angle between the voltages of the main and backup power sources on time. The proposed algorithm can be used in microprocessor fast-acting automatic transfer switch devices to ensure acceptable levels of currents of stators and electromagnetic moments of electric motors in self-starting modes and to maintain a complex continuous technolo­gical process at industrial enterprises. The effectiveness of the developed automatic system of synchronous connection of a backup power supply source has been confirmed using mathematical modeling methods and laboratory tests at an experimental stand.

Efficiency of energy storage devices as a backup power sources

2020 ◽  
Vol 6 ◽  
pp. 24-29
Author(s):  
Vyacheslav Shleynikov
Keyword(s):  
Cost Effectiveness ◽  
Energy Storage ◽  
Power Supply ◽  
Environmental Benefits ◽  
Energy Storage Devices ◽  
Power Sources ◽  
Storage Devices ◽  
Storage Technology ◽  
Energy Storage Technology ◽  
Supply Systems

Energy storage technology offers a number of economic and environmental benefits. This paper provides an analysis of power grid backing up solutions with energy storage devices assuming that energy storage backing up can be generally more efficient for microgrids than conventional reserving options. Cost-effectiveness and a distance to a backup source have been accepted as criteria for comparing. For power supply systems of 200 AH, the energy storage backup efficiency has been proven by appropriate computations as reflected in this paper.

Development of a Power Supply Source for the Technological Electron-beam Gun Control Electrode

Vestnik MEI ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 86-92
Author(s):  
Nikita M. Vakhmyanin ◽  
◽  
Aleksey V. Shcherbakov ◽  
Daria A. Gaponova ◽  
◽  
...  
Keyword(s):  
Electron Beam ◽  
Power Supply ◽  
Gun Control ◽  
Supply Source ◽  
Control Electrode ◽  
Power Supply Source

scholarly journals Printed electrodes for flexible, light-weight solid-state supercapacitors – a feasibility study

Circuit World ◽  
2015 ◽  
Vol 41 (2) ◽  
pp. 80-86 ◽  
Author(s):  
Jagdeep S. Sagu ◽  
Nicola York ◽  
Darren Southee ◽  
K.G.U. Wijayantha
Keyword(s):  
Energy Storage ◽  
Series Resistance ◽  
High Surface ◽  
Electrochemical Techniques ◽  
Equivalent Series Resistance ◽  
Energy Storage Devices ◽  
Power Sources ◽  
Content Type ◽  
Storage Devices ◽  
Flexographic Printing

Purpose – The purpose of this paper is to report on the feasibility of the manufacture of printed rechargeable power sources incorporating, in the first instance, electrode structures from the previous study, and moving on to improved electrode structures fabricated, via flexographic printing, using commercially available inks. It has been shown previously that offset lithography, a common printing technique, can be used to make electrodes for energy storage devices such as primary cells. Design/methodology/approach – A pair of the original Ag/C electrodes, printed via offset lithography, were sandwiched together with a PVA-KOH gel electrolyte and then sealed. The resultant structures were characterised using electrochemical techniques and the performance as supercapacitors assessed. Following these studies, electrode structures of the same dimensions, consisting of two layers, a silver-based current collector covered with a high surface area carbon layer, were printed flexographically, using inks, on a melinex substrate. The characterisation and assessment of these structures, as supercapacitors, was determined. Findings – It was found that the supercapacitors constructed using the offset lithographic electrodes exhibited a capacitance of 0.72 mF/cm2 and had an equivalent series resistance of 3.96 Ω. The structures fabricated via flexography exhibited a capacitance of 4 mF/cm2 and had an equivalent series resistance of 1.25 Ω The supercapacitor structures were subjected to bending and rolling tests to determine device performance under deformation and stress. It was found that supercapacitor performance was not significantly reduced by bending or rolling. Originality/value – This paper provides insight into the use of printed silver/carbon electrodes within supercapacitor structures and compares the performance of devices fabricated using inks for offset lithographic printing presses and those made using commercially available inks for flexographic printing. The potential viability of such structures for low-end and cheap energy storage devices is demonstrated.

scholarly journals CALCULATION OF OPTIMAL PARAMETERS FOR STORAGE AND RENEWABLE ENERGY SOURCES IN ISOLATED ENERGY SYSTEMS

2021 ◽  
pp. 91-95
Author(s):  
Mykhailo Syvenko ◽  
Oleksandr Miroshnyk
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Power Supply ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Electric Energy ◽  
Energy Sources ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Supply Systems

A detailed substantiation of the use of electric energy storage devices in the presence of generators on renewable energy sources in the power supply system is given. The dependence of the storage parameters on the composition and priority of generation in the system is investigated. The solution of the problem of determining the parameters of electricity storage devices by means of purposeful simulation of generation parameters is considered. The results of the choice of power and capacity of the energy storage using technical and economic indicators are shown. Optimal parameters of electric energy storage devices as one of the most important means of ensuring the activity of isolated power supply systems together with selection of generating devices are determined. The results of calculations of capacity of renewable energy sources in isolated power supply systems in combination with classical energy sources are given. The necessity of using the principle of activity of the distribution electric network and the possibility of its realization is demonstrated. The optimal storage capacity as a function of the share of renewable generation, the non-integrated energy produced by renewable sources and the total storage capacity are plotted for several isolated systems. The main points of the used model of the power supply system of isolated networks are given. In the studied isolated power supply systems, wind power plants and solar power plants, which have significant unpredictability of generation, are used as generation based on renewable energy sources. The problem of undersupply of electricity to the grid by stepwise increase of generation is analysed. The results of the multi-step selection of power and energy consumption of electricity storage are determined by technical criteria.

scholarly journals Development of a mathematical model of an autonomous power supply source with a free piston motor on the basis of a synchronous electric returning machine with a permanent magnets

2020 ◽  
Vol 22 (1) ◽  
pp. 38-48
Author(s):  
A. R. Safin ◽  
I. V. Ivshin ◽  
E. I. Gracheva ◽  
T. I. Petrov
Keyword(s):  
Electric Power ◽  
Power Supply ◽  
Power Plants ◽  
Permanent Magnets ◽  
Combustion Engine ◽  
Design Parameters ◽  
Supply Source ◽  
Free Piston ◽  
Power Supply Source ◽  
The Russian Federation

One of the current trends at present is the development of small energy, which is a particularly urgent task for the Russian Federation with its vast territories and the specifics of the electric power system. In the Russian Federation, the bulk of the electricity is generated at large power plants and transmitted through power lines. 60–70% of the country's territory lacks a centralized power supply, where more than 20 million people live, and the development of small and micro-energy facilities is necessary. Using a synchronous electric reciprocating machine with permanent magnets in power plants of a modular type makes it possible to rationally design an autonomous power supply source, to obtain the most optimal design. The development of methodological design decisions and the optimization of engine design parameters as part of generating and drive complexes is an important scientific task. A mathematical description of thermodynamic processes in a free-piston internal combustion engine, electromechanical and thermal processes occurring in a synchronous electric reciprocating machine with permanent magnets is developed, which is a necessary condition for designing and optimizing the design of an autonomous electric power complex. According to theoretical calculations, in the Matlab application, on the basis of the additional Simulink module, a simulation model of a free-piston internal combustion engine, linear current load calculation units, stator magnetic induction, magnetic induction created by permanent inductor magnets, electromagnetic force were developed and calculated. The created procedure for calculating the parameters of the electromagnetic component of the force of a synchronous machine with permanent magnets allows you to calculate and optimize the design parameters of the inductor and stator element of the electric motor under consideration. Thus, this will allow us to design electric machines with improved energy characteristics, due to the use of the obtained simulation results, which will allow us to use them more efficiently in the composition of generating and drive complexes.

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