scholarly journals A technical solution for increasing the reliability of the phase-splitters of AC electric locomotives

2021 ◽  
Vol 2061 (1) ◽  
pp. 012011
Author(s):  
N P Astashkov ◽  
V A Olentsevich ◽  
Yu I Karlina ◽  
B O Kuznetsov ◽  
N A Kuznetsova
Keyword(s):  
Power Supply ◽  
Political Development ◽  
Supply Voltage ◽  
Electrical Equipment ◽  
Operating Conditions ◽  
Transport Infrastructure ◽  
Asia Pacific ◽  
Rolling Stock ◽  
Technical Solution ◽  
Voltage Variation

Abstract Russian Railways OAO is developing a program of the expansion of the Eastern polygon until 2030, the modernization of the transport infrastructure of which is the most important task for the economic and political development of the country. In the near future it is planned to complete the drawing up of a detailed planning schedule of the main stages of construction and parameters of reconstruction of the infrastructure of the Baikal-Amur Mainline and the Trans-Siberian railway. This will not only help to expand access to the markets of the Asia-Pacific region, but will also provide an opportunity to draw more income through an international transit East – West route. The tasks of increasing the reliability of electric rolling stock are brought to the forefront. The implementation of these tasks will reduce the cost of operating and repairing technological equipment. The development of technical means compatible with power supply systems and taking into account the operating conditions of electrical equipment is an urgent task. Power supply of auxiliary machines on all domestic electric locomotives is carried out without the stabilization of the voltage value and balance. At the same time, in order to ensure the reliability of the electric drive motors themselves when operating in the entire range of supply voltage variation, their rated power is increased by 25-50%. Therefore, auxiliary machines on all domestic electric locomotives of alternating current have increased overall dimensions and weight, but the circuit design of the drive system is simple and is presented in the article.

scholarly journals ELECTRIC SUPPLY OF UNDERGROUND CONSUMERS OF DEEP ENERGY-INTENSIVE MINES

2018 ◽  
pp. 25-46
Author(s):  
F. P. Shkrabets
Keyword(s):  
Power Supply ◽  
Supply Voltage ◽  
Maximum Load ◽  
Electrical Equipment ◽  
Transport Systems ◽  
Local Power ◽  
Electrical Networks ◽  
Electric Networks ◽  
Supply Networks ◽  
Technical And Economic Indicators

The increase in the capacity of cleaning and construction vehicles for highcapacity and energy-intensive mines calls for an increase in the  supply voltage of cleaning and tunneling combines, as well as  transport systems: from a voltage of 660 V switched to 1140 V, and  now to 3300 V. This allows improving technical and economic  indicators for clearing and access areas, as well as improving the reliability of local Power Supply Systems (PSS). However, this  trend prevents the supply of underground electric networks with a  voltage of 6 kV, in connection with which the problem arises of  increasing the voltage of supply networks. To date, it has become  possible to apply the 10 kV voltage to the operation, which is most  acceptable for the use of electrical equipment for electrical networks  and protection devices. Leading educational, research and design  organizations were engaged in research on this issue. An analysis of the results of the research showed that switching to 10 kV voltage is  justified and timely. At the same time, 35 kV voltage is not removed  from the agenda, which is technically feasible and economically  justified, but there are problems with the safety of its operation in  underground workings, which requires appropriate refinement. This  level of voltage will improve the quality of electricity.Conclusions: 1. Application of 35 kV voltage in the underground power supply system of coal and ore mines is advisable at a depth of more than 1000 m with a maximum load of at least 1000 kVA at the  level of the stem cables.2. Application of 35 kV voltage in underground electrical networks will allow to significantly improve the quality indicators of voltage,  reliability, and economy of the system due to the current unloading  of the most important element of SES, such as stem cables.3. Analysis of the main parameters and characteristics of electrical mine electrical equipment gives reason to believe that it allows  implementing a trend of 35 kV deep input to deep horizons of mines  (mines) and placement of 35/6 kV substations on working horizons.

scholarly journals Analysis of energy efficiency of suburban railway transport network

2021 ◽  
Author(s):  
Aleksander Jakubowski ◽  
Krzysztof Karwowski ◽  
Andrzej Wilk
Keyword(s):  
Energy Efficiency ◽  
Power Supply ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Daily Basis ◽  
Operating Conditions ◽  
Transport Network ◽  
Rolling Stock ◽  
Rail Network ◽  
Traction Power Supply

Rising numbers of agglomeration residents cause increased need for people movement on daily basis. Because of congestion of local roads, air pollution and limited parking space, providing mass transit based on electric traction is reasonable. While the electric rail vehicles are considered highly efficient in themselves, they need to be analyzed as a part of a transport network, because energy consumption depends on operating conditions as well. Information about energy efficiency of whole system operating under realistic conditions could be helpful for modernization of traction power supply, timetable planning or while ordering new rolling stock. This paper presents approach to analysis of energy efficiency of a suburban rail network, using specialized software developed on Matlab/Simulink basis. For the sake of analysis, simple transport network consisting of three lines was considered. Vehicles, assumed as uniform electric multiple units, operate according to the set schedule, taking into account varying electric drive efficiency and mass dependent on passengers’ number. Vehicles are supplied by four substations with nominal voltage of 3000 V DC, using overhead contact line. Developed model includes calculation of energy losses in power supply, therefore it is possible to determine efficiency of the whole network as a relation of mechanical energy of vehicles movement to electrical energy fed from public power system. Mean useful voltages for vehicles and substations are computed as well. Program structure allows for further expansion, e.g. with optimization algorithms.

scholarly journals Improving the theory for calculating the rational modes of traction electrical equipment

2019 ◽  
Vol 124 ◽  
pp. 05077 ◽  
Author(s):  
A.E. Auhadeev ◽  
R.G. Idiyatullin ◽  
P.P. Pavlov ◽  
V.M. Butakov ◽  
L.N. Kisneeva ◽  
...  
Keyword(s):  
Electrical Energy ◽  
Electrical Equipment ◽  
Operating Conditions ◽  
Rolling Stock ◽  
Electric Transport ◽  
Operating Modes ◽  
Scientific Hypothesis ◽  
Electric Rolling Stock ◽  
Traction Equipment ◽  
Electric Traction

Research shows that the existing theory and methods for calculating rational operating modes of traction electrical equipment do not provide a sufficient level of adequacy under real operating conditions of urban electric transport, which is due to the high complexity of the processes and the lack of a sufficiently developed methodology for their interpretation in industry theory. The purpose of the study was researching the process of electric traction as a result of transformation electrical energy in purposeful mechanical movement of electric rolling stock with the implementation of all technological conditions of production and technical system of urban electric transport. The scientific hypothesis that the modes of operation of electric traction equipment as part of an automated electric drive of the rolling stock of urban electric transport are formed under the influence of a complexly organized technological process of electric traction and are the topological basis of its structure is theoretically substantiated. The main result of the research is the formulated theoretical system which allows us to present the process of electric traction as a system consisting of five levels that are in hierarchical relations and solve each specific problem of building the movement of electric transport. Such an approach will contribute to the development of theory and methods for calculating rational operating modes of traction electrical equipment of urban electric transport, the improvement of the energy efficiency of which is the actual scientific problem.

scholarly journals Improvement of Multilevel DC/DC Converter for E-Mobility Charging Station

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2037 ◽  
Author(s):  
Jung-Hwan Lee ◽  
Sung-Jun Park ◽  
Sang-Kil Lim
Keyword(s):  
Power Supply ◽  
Supply Voltage ◽  
Input Power ◽  
Buck Converter ◽  
Operating Conditions ◽  
Multilevel Converter ◽  
Power Supply Voltage ◽  
Personal Mobility ◽  
Voltage Range ◽  
Charging System

Considerable efforts are being made to reduce CO2 emissions and thereby solve the problems of environmental pollution and global warming. Technologies for environmentally friendly transportation are being developed using batteries. In particular, with the increase in urbanization and one-person households, e-mobility products are drawing increasing attention as short-distance transportation devices. Among these vehicles, personal mobility devices (PMDs) are receiving attention as new transportation devices that are simple to operate. This paper proposes a new multilevel charging system that is advantageous in responding to the charging voltage specifications of various mobile devices with a single charging system while ensuring a low charging current ripple. The proposed diode-parallel multilevel converter consists of an independent Buck converter in series. The switch of the buck converter is configured at the negative terminal of the input power source so that the gate amplifier voltage is used as the power supply voltage; it can therefore be simply configured without a separate gate amplifier power supply. In addition, it is improved so as to have a wider charging voltage range in a low output voltage region and a better efficiency than the existing diode series multilevel converter. To verify the feasibility of the proposed system, simulations were performed using the software PowerSIM(PSIM), and, in order to verify the validity, a prototype charging system was fabricated to compare and analyze losses according to operating conditions.

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