scholarly journals Suggestion, Calculations, Practical Approbation of the Resonant Amplifier of the Reactive Electrical Power

2020 ◽  
Vol 2 (58) ◽  
pp. 20-27
Author(s):  
Yu. Batygin ◽  
S. Shinderuk ◽  
E. Chaplygin ◽  
T. Gavrilova ◽  
K. Bespalov
Keyword(s):  
Power Amplifier ◽  
Electromagnetic Coupling ◽  
Electrical Power ◽  
Resonant Converter ◽  
Electromagnetic Processes ◽  
Tesla Transformer ◽  
Calculation Results ◽  
External Electromagnetic Fields ◽  
Experimental Justification ◽  
Analytical Expressions

The aim of the paper consists in suggestion, theoretical and experimental justification of the principal workability of the electrical power amplifier proposed scheme consisting of two sequential resonant circuits with the regulated level of the electromagnetic coupling between them. Scientific novelty is determined by the formulated aim an achievement of which is based on conclusions of the theoretical analysis and experiments fulfilled for the acting model of the proposed electrical power amplifier. The base analytical expressions for the electromagnetic processes analysis in the scheme of the suggested resonant power amplifier are got. The reliability of the found analytical dependencies was shown with help of the limit passages to the according to analogs in the authoritative special publications. As the conducted experiments have shown that resonant conditions in the circuits of the suggested electrical power amplifier are fulfilling with high strictness (the frequency discrepancies are no more than ~ 0.8 %). The discrepancies between the measurement and the calculation results are quite small and can be explained by the external electromagnetic fields influence (the fields superposition of the "output" solenoid and the coupling transformer). In whole, the got results are illustrating the real possibilities of the power multiple amplifying (~35 times) in the suggested scheme of the electromagnetic resonant converter which was based on the advancement of the Tesla transformer creator ideas.

DEVELOPMENT OF A FAST WIRELESS BATTERY CHARGING TECHNOLOGY FOR ACCUMULATORS USED IN CLEAN ENERGY TRANSPORT VEHICLES. STATIC CHARACTERISTICS OF A SERIES-TO-SERIES RESONANT CONVERTER FOR CONTACTLESS INDUCTIVE ENERGY TRANSMISSION

2019 ◽  
pp. 56-61
Author(s):  
Huang ChunXiang ◽  
Henadiy Pavlov ◽  
Mykhailo Pokrovskyi ◽  
Andriy Obrubov ◽  
Iryna Vinnychenko
Keyword(s):  
Supply Voltage ◽  
Clean Energy ◽  
Resonant Converters ◽  
Resonant Converter ◽  
Output Current ◽  
Energy Transmission ◽  
Battery Charging ◽  
Electromagnetic Processes ◽  
Series Resonant ◽  
Pulse Count

The research object is the electromagnetic processes in the semiconductor power converters based on the schemes with circuit commutation and containing resonant circuits of reactive elements and transformers with a small coupling coefficient. The research aim is to develop a technology for a fast wireless battery charging for the use in clean energy vehicles, which would be based on a resonant converter with a pulse-count adjustment with a phase shift control. The latter provides a high energy performance in a wide range of regulation and a low sensitivity to changes in the magnetic system parameters. This is a final report. The report presents the results of the work performed in accordance with the Terms of Reference for the second stage of the scientific and research work. The following theoretical problems have been solved: development of a mathematical model of a series resonant converter with a pulse-count adjustment for contactless inductive energy transmission, which provided a high accuracy for the studies of the electromagnetic processes in the power section of multi-circuit resonant converters for contactless energy transmission, as well as an opportunity to assess the energy parameters of multi-circuit converters at pulse-count adjustment; compilation of mathematical dependencies of the average input and output current values on the number of half-cycles of resonant oscillations during energy transmission to the circuit and energy dissipation, the supply voltage and the resonant circuit’s parameters, which allowed assessing the converter’s energy parameters over a wide control range; compilation of the dependencies of the converter’s output power and coefficient of efficiency on the number of halfcycles of resonant oscillations during energy transmission to the circuit and energy dissipation, on supply voltage and on the resonant circuit’s parameters, which made it possible to evaluate the efficiency of the pulse-count adjustment of resonant converters for contactless energy transmission; realization of a dynamic model of a resonant converter for contactless energy transmission in the form of transfer functions for small disturbances caused by fluctuations in supply voltage, which made it possible to estimate the effect of its instability on the quality of output current stabilization.

Extrusion of stiffening ribs on body parts with local heating

2021 ◽  
pp. 72-74
Author(s):  
Keyword(s):  
Velocity Field ◽  
Stress Relaxation ◽  
Local Heating ◽  
Hot Extrusion ◽  
Body Parts ◽  
Calculation Results ◽  
Energy Equilibrium ◽  
Stiffening Ribs ◽  
Analytical Expressions ◽  
Kinetics Of

A scheme is proposed and analytical expressions are obtained for calculating the kinematics, pressure and damageability of the material during hot extrusion of ribs on body parts. The equations of states during creep, energy equilibrium, kinetics of material discontinuity are used. The calculation results are presented. Keywords: extrusion, local heating, stiffening rib, viscosity, plasticity, stress relaxation, pressure, velocity field [email protected], [email protected]

An Analytical Method of Analyzing the Heat Conduction for the Unequal Cross-Section Straight Fin

2013 ◽  
Vol 365-366 ◽  
pp. 1211-1216
Author(s):  
Fan Zhang ◽  
Peng Yun Song
Keyword(s):  
Heat Conduction ◽  
Cross Section ◽  
Analytical Method ◽  
Thermal Analyses ◽  
Cross Sectional ◽  
Cross Section Area ◽  
Section Area ◽  
Calculation Results ◽  
The Cross ◽  
Analytical Expressions

The cross-section area of straight fin is often considered to be equal in the thermal analyses of straight fin, but sometimes it is unequalin actual situation. Taking a straight fin with two unequal cross-sectional areas as an example,an analytical method of heat conduction for unequal section straight fin is presented. The analytical expressions of temperature field and heat dissipating capacity about the fin,which has a smaller cross-section area near the fin base and a larger one, is obtained respectively. The calculation results of the unequal cross-section are fully consistent with the equal area one, so the method is proved right. The results show that the larger the cross section areanear the base,the better is the heat transfer, and the temperature at the base with larger cross-section area is lower than that with smaller cross-section area when the amount of heat is fixed.

scholarly journals Dangerous Voltages due to Direct Lightning Strike into the Communication Tower

2007 ◽  
Vol 3 (1) ◽  
pp. 44
Author(s):  
Slavko Vujević ◽  
Petar Sarajčev
Keyword(s):  
Software Package ◽  
Electromagnetic Coupling ◽  
Circular Cross Section ◽  
Potential Method ◽  
Lightning Strike ◽  
The Earth ◽  
Lumped Parameter ◽  
Leakage Resistance ◽  
Tower Structure ◽  
Analytical Expressions

This paper presents a novel technique for computing dangerous voltages due to direct lightning strike into the communication tower and associated earthing system, which is based on the use of the well-known ATP-EMTP software package. The earthing grid and the communication tower structure are approximated by the circular cross section conductors. In numerical model, conductors are subdivided into segments (1D finite elements) and Clark's model with distributed constant parameters is then applied. Because of the limitations of ATP-EMTP software package, the leakage resistance of buried segments is modelled as additional lumped parameter. Analytical expressions for distributed and lumped segment parameters are derived using the average potential method. Mutual electromagnetic coupling between segments is neglected due to the limitations imposed by the ATP-EMTP software package, which is based on transmission line approach. Separate computer program is developed for obtaining the earth surface transient potential distribution, from which step and touch voltages are then computed.

scholarly journals Two approaches for automating analysis of electromagnetic processes in non-linear circuits with valves

2019 ◽  
Vol 139 ◽  
pp. 01085 ◽  
Author(s):  
Khushnud Sapaev ◽  
Shukhrat Umarov
Keyword(s):  
Numerical Integration ◽  
Linear Approximation ◽  
Piecewise Linear ◽  
Piecewise Linear Approximation ◽  
Equivalent Circuits ◽  
Electric Circuits ◽  
Electromagnetic Processes ◽  
Integration Formulas ◽  
Analytical Formulas ◽  
Analytical Expressions

This article analyses and compares two approaches related to automating modeling of valve electric circuits with piecewise linear approximation of valve characteristics. The first approach is based on operator equivalent circuits’ analytical formulas and on analytical expressions programming which describe equivalent circuits on each conduction interval of valve elements. The second approach provides implementation of a system for modeling valve converters based on implicit numerical integration formulas.

scholarly journals Numerical study of the effect of penstock slope on the increase in electric power of micro-hydro system using Computational Fluid Dynamics

2021 ◽  
Vol 927 (1) ◽  
pp. 012029
Author(s):  
Yoga Satria Putra ◽  
Evi Noviani ◽  
Muhardi ◽  
Azrul Azwar
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Electric Power ◽  
Numerical Study ◽  
Electrical Power ◽  
Maximum Slope ◽  
The Public ◽  
Hydropower Plants ◽  
Calculation Results ◽  
Alternative Solutions

Abstract Micro-hydropower plants have become one of the alternative solutions to meet the electricity needs of people in remote villages that the public electricity company has not reached. However, the performance of a micro-hydro system has to be continuously developed. This research aims to improve the performance of a micro-hydro system by examining the effect of the slope of the penstock on the increase in electrical power. The penstock slope is varied with diverse angles, namely θ = 50 °, 60 °, 70 °, 80 °, and 90 °. Five simulations of water flow in the penstock for five slope angles were constructed using the open-source CFD software, i.e., OpenFOAM. We calculate the electric power for the five simulations aforementioned. The calculation results show that the variation of the penstock slope can affect the increase of the electric power of a micro-hydro system. The highest electric power occurs at a maximum slope, θ = 90 °.

scholarly journals Class D Power Amplifier Used In Programmable Ac Power Source Ideal To Analyse Electronic Equipment Performance In The Electrical Power System Quality

2009 ◽  
Vol 14 (1) ◽  
pp. 9-16
Author(s):  
Fábio Vincenzi Romualdo da Silva ◽  
João Batista Vieira Júnior ◽  
Ernane Antônio Alves Coelho ◽  
Valdeir José Farias ◽  
Luiz Carlos de Freitas
Keyword(s):  
Power System ◽  
Power Amplifier ◽  
Electrical Power ◽  
Power Source ◽  
Electronic Equipment ◽  
System Quality ◽  
Electrical Power System ◽  
Class D ◽  
Ac Power ◽  
Equipment Performance

scholarly journals EVALUASI PENYETELAN RELE JARAK PADA JARINGAN TRANSMISI 70 kV BOLOK – MAULAFA MENGGUNAKAN DIGSILENT 15.1.7

2020 ◽  
pp. 1-9
Author(s):  
Agusthinus S. Sampeallo ◽  
Nursalim Nursalim ◽  
Maria Alfiana Sea Sagho
Keyword(s):  
Power Distribution ◽  
Electrical Power ◽  
Distance Relay ◽  
Standard Distance ◽  
Trip Time ◽  
Calculation Results ◽  
Distance Relays ◽  
Protection And Control ◽  
And Control ◽  
Distribution Distance

ABSTRAKDalam menjamin keandalan penyaluran daya listrik maka, rele jarak sebagai rele proteksi utama pada jaringan transmisi 70 kV Bolok - Maulafa harus mampu mendeteksi dan melokalisr gangguan yang ada. Rele Jarak bekerja dengan membandingkan impedansi pada saluran (impedansi gangguan) dengan impedansi terpasang (impedansi penyetelan). Penelitian ini dilakukan untuk melihat apakah penyetelan yang ada sekarang sudah sesuai dengan ketentuan yang ada dalam Buku Pedoman Proteksi dan Kontrol Penghantar. Evaluasi ini dilakukan dengan membandingkan penyetelan yang terpasang dengan ketentuan penyetelan yang diatur dalam Dok:PDM/SGI15:2014 yang kemudian dilakukan simulasi mengguanakan DigSilent 15.1.7 untuk melihat jangkauan rele jarak berdasarkan penyetelan ituDari hasil evaluasi, penyetelan impedansi oleh PT.PLN sudah tidak sesuai dengan ketentuan yang ada dan untuk penyetelan waktu trip sudah sesuai dengan ketentuannya. Berdasarkan hasil perhitungan penyetelan baru (sesuai standar) rele jarak didapat nilai penyetelan baru untuk zona 1 dan zona 2 bay penghantar Bolok - Maulafa sebesar 4.69870.18⁰ sec.ohm dan 13.65870.18⁰ sec.ohm. Sedangkan untuk penghantar Maulafa - Bolok sebesar 4.264 70.18⁰ sec.ohm dan 6.07670.18⁰ sec.ohm. ABSTRACT In ensuring the reliability of electrical power distribution, distance relays as the main protection relays on the transmissiom line 70 kV Bolok - Maulafa must be able to detect and localize existing disturbances. Distance Rele works by comparing the impedance of the line (fault impedance) with the installed impedance (tuning impedance). This research was conducted to see whether the current settings are in accordance with the provisions in the introductory Protection and Control Handbook. This evaluation is carried out by comparing the settings attached to the tuning conditions set out in the Doc: PDM / SGI15: 2014 which are then simulated using DigSilent 15.1.7 to see the distance relay range based on that adjustment.From the evaluation results, the impedance setting by PT.PLN is no longer in accordance with the existing provisions and for setting the trip time in accordance with the provisions. Based on the calculation results of the new settings (according to the standard) distance relay, the value of the new settings for zone 1 and zone 2 of the Bolok - Maulafa conveyor bay is 4.69870.18⁰ sec.ohm and 13.65870.18⁰ sec.ohm. As for the conductor of Maulafa - Bolok, it is 4,26470.18⁰ sec.ohm and 6,07670.18⁰ sec.ohm.

DEVELOPMENT OF A FAST WIRELESS BATTERY CHARGING TECHNOLOGY FOR ACCUMULATORS USED IN CLEAN ENERGY TRANSPORT VEHICLES. ANALYSIS OF THE CHARACTERISTICS OF THE RESONANT CONVERTER FOR CONTACTLESS INDUCTIVE ENERGY TRANSMISSION

2019 ◽  
pp. 62-68
Author(s):  
Hui Weidong ◽  
Henadiy Pavlov ◽  
Pokrovskyi Mykhailo ◽  
Andriy Obrubov ◽  
Iryna Vinnychenko
Keyword(s):  
Energy Dissipation ◽  
Supply Voltage ◽  
Clean Energy ◽  
Resonant Converters ◽  
Resonant Converter ◽  
Output Current ◽  
Energy Transmission ◽  
Battery Charging ◽  
Electromagnetic Processes ◽  
Pulse Count

The research object is the electromagnetic processes in the semiconductor power converters based on the schemes with circuit commutation and containing resonant circuits of reactive elements and transformers with a small coupling coefficient. The research aim is to develop a technology for a fast wireless battery charging for the use in clean energy vehicles, which would be based on a resonant converter with a pulse-count adjustment with a phase shift control. The latter provides a high energy performance in a wide range of regulation and a low sensitivity to changes in the magnetic system parameters. This is a final report. The report presents the results of the work performed in accordance with the Terms of Reference for the second stage of the scientific and research work. The following theoretical problems have been solved: development of a mathematical model of a series resonant converter with a pulse-count adjustment for contactless inductive energy transmission, which provided a high accuracy for the studies of the electromagnetic processes in the power section of multi-circuit resonant converters for contactless energy transmission, as well as an opportunity to assess the energy parameters of multi-circuit converters at pulse-count adjustment; compilation of mathematical dependencies of the average input and output current values on the number of half-cycles of resonant oscillations during energy transmission to the circuit and energy dissipation, the supply voltage and the resonant circuit’s parameters, which allowed assessing the converter’s energy parameters over a wide control range; compilation of the dependencies of the converter’s output power and coefficient of efficiency on the number of half-cycles of resonant oscillations during energy transmission to the circuit and energy dissipation, on supply voltage and on the resonant circuit’s parameters, which made it possible to evaluate the efficiency of the pulse-count adjustment of resonant converters for contactless energy transmission; realization of a dynamic model of a resonant converter for contactless energy transmission in the form of transfer functions for small disturbances caused by fluctuations in supply voltage, which made it possible to estimate the effect of its instability on the quality of output current stabilization.

scholarly journals Resonant reactive power amplifier. Analysis of electromagnetic processes

2019 ◽  
Vol 0 (2) ◽  
pp. 34-42
Author(s):  
Yu.V. Batygin ◽  
G.S. Serikov ◽  
S.O. Shinderuk ◽  
V.A. Strelnikova ◽  
E.R. Usmonov
Keyword(s):  
Power Amplifier ◽  
Reactive Power ◽  
Electromagnetic Processes
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