scholarly journals A Decomposition Four-Component Model for Calculating Power Losses in Low-Voltage Power Supply Systems

2021 ◽  
Vol 60 (3) ◽  
pp. 79-91
Author(s):  
Dmitry Tugay ◽  
Olexandr Shkurpela ◽  
Valentyn Akymov ◽  
Ivan Kostenko ◽  
Oleksandr Plakhtii
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Low Voltage ◽  
Supply System ◽  
Total Power ◽  
Power Losses ◽  
Component Structure ◽  
Capital Costs ◽  
Proposed Model ◽  
Three Phase

A new model for decomposition of the total power losses, which includes four components is proposed. Each of the components of the proposed model has a certain physical meaning due to the nature of electromagnetic processes in a three-phase four-wire system. Definitions to describe each of the proposed components are formulated. It is shown that each of supplementary components of the total loss power is proportional to the minimum possible loss power and to the square of the RMS value of the power, which is caused by its occurrence in three-phase four-wire power supply system, and it is inversely proportional to the mean square of the net power loss. The synthesized Matlab-model for verification of the four-component structure of power losses showed a high degree of its adequacy. The proposed model allows us to rethink the description of power losses in three-phase AC circuits and can be used in specialized measuring instruments for electrical networks monitoring. Using the information obtained in the monitoring process, it is possible to plan technical measures to reduce losses of electrical energy in the power supply system, as well as to estimate the capital costs of these measures.

Selection and substantiation of main design parameters of catenary suspension for three-phase traction power supply system on tangent level track

2021 ◽  
pp. 69-77
Author(s):  
Boris Alexeevich Arzhannikov ◽  
◽  
Alexander Viktorovich Paranin ◽  
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Current Collector ◽  
Supply System ◽  
Design Parameters ◽  
Main Design ◽  
Traction Power Supply System ◽  
Three Phase ◽  
Traction Power Supply ◽  
Traction Power

At development of common concept of current collection for three-phase traction power supply system there is the need to select and substantiate main design parameters of catenary suspension. For this purpose, the authors have carried out analytical calculations and developed a numerical mathematical model that allows assessing catenary statics and it’s dynamics in interaction with current collector. On the basis of results of modeling, the authors have substantiated and selected all the required parameters. In particular, they have determined the permissible speed of trains and maximal length of catenary spans.

Study on Energy Saving and Emission Reduction of EP Low-Voltage Power Supply System in Power Plant

2011 ◽  
Vol 219-220 ◽  
pp. 1109-1112
Author(s):  
Man Yin Hu ◽  
Chao Du ◽  
Bo Yang
Keyword(s):  
Energy Saving ◽  
Power Supply ◽  
Emission Reduction ◽  
Power Supply System ◽  
Electrostatic Precipitator ◽  
Low Voltage ◽  
Status Quo ◽  
Supply System ◽  
Technical Solutions ◽  
Technical Measures

According to operation situation of power plant’s EP, the technical measures of energy saving in low-voltage power supply system have been analyzed over the years. Based on the classical theory of electrostatic precipitator and the operating status quo of EP, the paper has been focused on the principles of energy-saving and emission-reduction EP, established high-voltage current supply energy-saving and emission-reduction EP dust removal efficiency of mathematical models, analyzed energy saving and emission reduction technical measures of the low voltage device and proposed the technical solutions. It provided reference for design, adjustment, operation and energy saving of power plant’s EP.

scholarly journals Research on Control Strategy of AC-DC-AC Substation Based on Modular Multilevel Converter

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Fei Chang ◽  
Zhongping Yang ◽  
Fei Lin
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Single Phase ◽  
Supply System ◽  
Multilevel Converter ◽  
Traction Power Supply System ◽  
Three Phase ◽  
Phase Converter ◽  
Traction Power Supply ◽  
Traction Power

Significant disadvantages in power quality especially the unbalance problem and neutral sections restrict the evolution of conventional traction power supply system. A new traction power supply system based on three-phase to single-phase converter is studied, which can transfer active power from three-phase grid to single-phase catenary. One catenary section could be utilized in the new traction power supply system instead of the multiple split sections in conventional system. Three-phase to single-phase converter is the core equipment of new traction power system. MMC (modular multilevel converter) structure of AC-DC-AC substation is proposed in this paper. To solve the problem of the capacitor voltage balancing in MMC, a parallel sorting algorithm based on field programmable gate array (FPGA) is studied. And the correctness and effectiveness of the algorithm are verified by experiments. In addition, it is inevitable that the AC grid voltage will be unbalanced caused by the fault in the new system. Therefore, this paper focuses on the analysis of the effect of the unbalanced grid voltage on the operating characteristics of the MMC system. Finally, the correctness of the theoretical analysis is verified by simulation.

scholarly journals Calculation of energy-saving effect from the use of parallel active filters in a three-phase fourwire power supply system with increasing the averaging interval of the measured values

2017 ◽  
Vol 22 (4) ◽  
pp. 18-24
Author(s):  
Viktor Volodymyrovych Kaplun ◽  
Volodymyr Mykolaiovych Bobrovnyk ◽  
Mykhailo Yukhymovych Artemenko ◽  
Serhii Yosyfovych Polishchuk
Keyword(s):  
Energy Saving ◽  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Active Filters ◽  
Three Phase ◽  
Saving Effect
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