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1
Zong, Ruixue. « Power Quality Problems of the Electrified Railway and Its Control Methods ». Journal of Physics : Conference Series 2496, no 1 (1 mai 2023) : 012017. http://dx.doi.org/10.1088/1742-6596/2496/1/012017.
Texte intégralRésumé :
Abstract In developing the railway industry, the electrified railway plays a significant role in improving the national economy. However, the electric railway power supply system will be affected by power quality problems such as negative sequence, harmonic, and voltage fluctuation in actual operation, which will affect the operation efficiency of the electric railway power supply system. Therefore, it is meaningful to take economic and effectual governance measures against the power quality problems of electrified railways and reduce various indicators to the range allowed by a national standard. This paper summarizes and sorts out the main problems and their causes of current electrified railway power quality and several existing mainstream power quality governance schemes. It analyzes their advantages and disadvantages and finally looks forward to the directions that can be optimized and improved in the future study of electrified railway power quality problems in combination with social reality. It has a specific guiding effect on future research on electrified railway power quality.
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Gusarova, Elena V., Valeriy V. Kharchenko et Valentin A. Gusarov. « System of the Autonomous Lighting of Railway Objects ». Elektrotekhnologii i elektrooborudovanie v APK 48, no 4 (décembre 2021) : 36–44. http://dx.doi.org/10.22314/2658-4859-2021-68-4-36-44.
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Railways run throughout Russia. There are sections of roads where centralized power supply lines are located far away or absent. It is difficult to regulate and ensure traffic safety at the sufficient level on such sections at the intersection of roads and railways at the same level. (Research purpose) The research purpose is to analyze the equipment available on the Russian market, powered by renewable energy sources, to solve the problem of guaranteed power supply to remote railway infrastructure objects and to select the most promising types, the effectiveness of which depends on natural and climatic conditions. (Materials and methods) The article presents a power supply system that can be applied to various artificial and engineering structures of general-purpose railway transport, such as crossings, bridges, tunnels, crossings in front of bridges and tunnels, sidings and others, for emergency or on-duty lighting. Such a system allows you to save electricity coming from a centralized power supply system, and in the case of an emergency shutdown, to provide power supply to the facility for a long time, and perform the function of backup power supply, but it takes on special importance in places where there are no centralized networks, when using it as an autonomous power supply system. (Results and discussion) The article presents a classification according to the categories of autonomous power supply systems, criteria of importance and power consumption of the objects, and gives the conditions for their use. The article describes a block diagram of the power supply system of a pedestrian crossing over a single track with energy reservation for up to three days. The daily energy consumption of a railway pedestrian crossing with lighting and railway traffic lights, installed the energy capacity of batteries with redundancy for up to three days, the power and number of photovoltaic converters are calculated. (Conclusions) An example of an autonomous lighting system for a railway pedestrian crossing with established technical parameters of equipment showed the social and economic efficiency of its application.
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Domanskyi, Valerii, Illia Domanskyi, Svitlana Zakurdai et Dmytro Liubarskyi. « Development of technologies for selecting energy-efficient power supply circuits of railway traction networks ». Technology audit and production reserves 4, no 1(66) (31 août 2022) : 47–54. http://dx.doi.org/10.15587/2706-5448.2022.263961.
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The object of the study is the process of operation of traction and external power supply systems as objects of inextricable interconnection while reducing energy costs in the cost of railway transportation in real time. One of the most problematic areas is the technology for choosing energy-efficient power supply schemes for railway traction networks in real time. The methods of forming and transforming graphs of complex schemes of traction and external power supply systems and building expert control systems for the implementation of energy-saving technologies of electrified railways were further developed in the work. In the course of the study, to increase the efficiency of simulation modeling of electric traction networks, the statistical characteristics of the loads of feeders that supply the final boundary sections, stations, depot access tracks, railway junctions and idle voltages on the traction substation tires were obtained. Methods of calculation and modeling of traction power supply have been developed, which take into account the inseparable relationship with power systems and allow choosing rational modes with minimal power flows and energy losses. Proposed methods of managing the modes of operation of the traction power supply system based on a vague description of their states and an expert system that allow solving new problems. Including, the choice of energy-saving power supply schemes in the case of power flows, economic modes of network operation in case of intensification of the transportation process. Thanks to this, ways of reducing power consumption and minimizing energy losses of traction power supply systems are proposed, which allow minimizing power flows and power losses by adjusting load flow parameters and voltage levels of traction substations. And also to increase the energy efficiency of electrified railway lines. The technique of technical and economic feasibility of power supply schemes of traction networks and evaluation of the possibility of switching to cantilever or loop power supply schemes with parallel connection points has been developed. The implemented recommendations save about 25 thousand kWh per 1 km of two-track section.
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Grigor’ev, N. P., I. V. Ignatenko, S. A. Vlasenko, V. A. Kovalev et V. V. Shatalov. « Increasing the performance of the Far Eastern Railway traction power supply system ». RUSSIAN RAILWAY SCIENCE JOURNAL 81, no 3 (21 septembre 2022) : 248–57. http://dx.doi.org/10.21780/2223-9731-2022-81-3-248-257.
Texte intégralRésumé :
Introduction. The purpose of the study is to develop measures determined by the strategic programmes for the development of Russian railway transport based on the analysis of power supply schemes for the traction network of the Far Eastern Railway, a branch of Russian Railways.Materials and methods. Evaluation of the performance of the traction power supply system was made based on the analysis of the actual performance of the Far Eastern Railway section, as well as the theories of electrical engineering and power supply of the 25 kV AC electrified railway system.Results. Based on the analysis of the joint operation of the external and traction power supply systems of the Far Eastern Railway, four traction substations with low technical and economic indicators were identified. Network sections that feed the substations are a bottleneck in the traction power supply system. It is proposed to increase the efficiency by switching the connection of the windings of transformers of traction substations to the systems of external and traction power supply according to the typical star – delta scheme. Such a connection will ensure an increase in the speed of trains, a reduction in train succession time and losses of electricity, an increase in the quality of electric energy in the external power supply system and electric networks of the Far Eastern Directorate for Energy Supply (a structural subdivision of Transenergo, a branch of Russian Railways).Discussion and conclusion. Normalisation of the connection of four traction substations according to the feeding scheme is ensured by changing the phasing in such a way that the power supply of the two legs of one winding of the power transformer is transferred to two windings. Alignment of the current modules in the windings of transformers of traction substations makes it possible to reduce the voltage drop in the most loaded phase and, accordingly, increase the voltage in the traction network, which ensures an increase in the speed of trains and a reduction in passing intervals. Switching the power supply of the arms from one winding of the transformer to two reduces the loss of electrical energy in power transformers and the external power supply system. Reducing the current unbalance in the windings of the power transformer improves the quality of electrical energy in the system of external and district power supply. An increase in the service life of the power transformer is ensured by a decrease in the intensity of thermal wear of the insulation of the most loaded winding.
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Bondarenko, A. V. « Innovative principles of electric power supply of non-traction power consumers of railway transport ». Herald of the Ural State University of Railway Transport, no 2 (2020) : 44–50. http://dx.doi.org/10.20291/2079-0392-2020-2-44-50.
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The issues of fundamental changes of electric power-supply of non-traction devices, such as, line-section devices and systems of railway transport are addressed in the article. It is clearly shown that the possibility of electric power-supply of such consumers without using the common high-voltage line-section power-supply lines of alternative voltage of 6 or 10 kV and respective power-supply substations can be implemented in practice. The essence of the proposed is that the electric power-supply source is not a high-voltage power-supply line, but a device which converts potential mechanical energy of a train, moving along a line section between signal points of railway automatic block system, into electrical one. Putting the described power-supply devices into operation provides technical as well as economic advantages over currently and widely used power-supply systems. The conversion of energy is carried out by changing magnetic resistance of a magnetic circuit, which includes railway car wheel-set in motion and direct neodymium magnet. Change in magnetic resistance due to the law of electromagnetic induction results in alternate voltage in the inductance coil, which is used as the electric power-supply source for non-traction line-section power consumers, including but not limited to, signal point of railway automatic block system. In case there is no wheel-set on the converter, electric power-supply for the power consumer is delivered by the electric energy accumulated in an ionistor (supercapacitor).
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БОЙКО, СЕРГІЙ, СВЯТОСЛАВ ВИШНЕВСЬКИЙ, ПЕТРО ПОЛІЩУК, ОЛЕКСАНДРА ЛАПІНА et СТАНІСЛАВ ГВОЗДІК. « ПЕРСПЕКТИВИ ВЗАЄМОДІЇ ЗАЛІЗНИЧНОГО ТА АВІАЦІЙНОГО ТРАНСПОРТУ В АСПЕКТІ ДЕКАРБОНІЗАЦІЇ ТА ІНТЕЛЕКТУАЛІЗАЦІЇ ». Herald of Khmelnytskyi National University. Technical sciences 343, no 6(1) (28 novembre 2024) : 56–61. https://doi.org/10.31891/2307-5732-2024-343-6-7.
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Main railway transport occupies an important place in the field of domestic freight and passenger transport. On the other hand, railway transport is a consumer of both fuel and electrical energy. The electrification of main railways brings Ukraine closer to the successful implementation of the program of decarbonization and greening in the field of transport. Meanwhile, the dependence of electrified railway transport on the supply of electrical energy is increasing, which affects the safety of transportation, timeliness and reliability of cargo delivery. In terms of intellectualization, modern digital and telecommunication technologies are being implemented in railway transport, which require reliable and high-quality power supply. For this purpose, a number of scientific studies consider the possibility and make specific proposals regarding the inclusion of sources of distributed generation, including on the basis of renewable sources of electrical energy, in particular wind generators, solar batteries or their hybrid combinations. Such solutions make it possible to ensure a reliable power supply of the responsible electric receivers of the rolling stock, thereby ensuring the reliability of the operation of railway transport. At the same time, new principles of interaction between different types of transport are being actively implemented. One of them is the interaction of railway and air transport. Aviation transport today is represented by manned aircraft and unmanned aerial vehicles. The vision proposed by the authors regarding the improvement of the existing power supply systems in the aspect of decarbonization and intellectualization of the railway infrastructure is aimed at maintaining a sufficiently high level of safe interaction of the railway with other types of transport, including air transport. Increasing the level of safety in railway transport is achieved due to the introduction of new technologies for the purpose of monitoring the state of the railway infrastructure through the introduction of unmanned aerial vehicles.
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Karlina, A. I., A. R. Akhmetshin, K. V. Suslov, V. A. Olentsevich, A. V. Sivtsov et Yu I. Karlina. « Justification of measures aimed at increasing the capacity of a section of a railway line, taking into account its required electrical capacities ». Journal of Physics : Conference Series 2176, no 1 (1 juin 2022) : 012041. http://dx.doi.org/10.1088/1742-6596/2176/1/012041.
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Abstract The annual increase in cargo turnover to the Far Eastern seaports contributes to the optimization of the railway infrastructure in order to increase the level of throughput and processing capacity of the Baikal-Amur Mainline and Trans-Siberian Railway facilities. JSC Russian Railways pays special attention to these issues. Organization and promotion of car traffic through the formation of freight trains using the connection technology, “virtual coupling”, heavy and dual trains that move on an ongoing basis is one of the innovative methods for increasing the carrying capacity for highly loaded sections and directions at a level of utilization of their throughput of 0, 8 or more. Under these conditions, the organization of efficient power supply of railway sections and facilities is the main factor influencing the value of the throughput capacity of transport infrastructure facilities. The article presents a technical justification for the measure aimed at increasing the throughput and processing capacity of a section of a railway line, taking into account the stability check of the devices of the traction power supply system. The predicted parameters of the operation of the traction power supply system of the railway line section are given with a promising train schedule.
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Qu, Zhi Jian, et Li Liu. « Real-Time Database System Implementation of Railway Signal Power Source Remote Monitoring ». Applied Mechanics and Materials 128-129 (octobre 2011) : 961–64. http://dx.doi.org/10.4028/www.scientific.net/amm.128-129.961.
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Railway signal is a key technology for high-speed railway，which is the foundation to keep the high-speed train line. Railway signal power is the automatic blocking of railway lines and 10kV lines transform into 380V power through after the power supply for railway signals. Signal power as the railway traffic signal of the power supply, it belongs to the first level of power system load. Its 10kV high voltage side stik up by the major of electric, 380V low voltage side maintenance by the signal major. When the signal power failure, often occur shirk responsibilities between the different majors, in order to define the responsibilities of the accident better, which need automation remote monitoring for main railway lines of the railway signal power and scheduling control as soon as possible[1-3].
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Wu, Si, Mingli Wu et Yi Wang. « A Novel Co-Phase Power-Supply System Based on Modular Multilevel Converter for High-Speed Railway AT Traction Power-Supply System ». Energies 14, no 1 (5 janvier 2021) : 253. http://dx.doi.org/10.3390/en14010253.
Texte intégralRésumé :
The existing problems of the traction power-supply system (i.e., the existence of the neutral section and the power quality problems) limit the development of railways, especially high-speed railways, which are developing rapidly worldwide. The existence of the neutral section leads to the speed loss and traction loss as well as mechanical failures, all of which threaten the fast and safe operation of the train and the system. Meanwhile, the power quality problems (e.g., the negative sequence current, the reactive power, and the harmonic) can bring a series of problems that cannot be ignored on the three-phase grid side. In response, many researchers have proposed co-phase power-supply schemes to solve these two problems simultaneously. Given that the auto-transformer (AT) power-supply mode has become the main power-supply mode for the high-speed railway traction power-supply system, it has a bright future following the rapid development of the high-speed railway. In addition, there is no co-phase power-supply scheme designed for AT power-supply mode in the existing schemes. Therefore, the main contribution of this paper is to propose a specifically designed power-supply mode more suitable for the AT, as well as to establish the control systems for the rectifier side and the inverter side. In addition, for the proposed scheme, the operation principle is analyzed, the mathematical model is built, and the control system is created, and its functionality is verified by simulation, and its advantages are compared and summarized finally. The result proves that it can meet functional requirements. At the same time, compared with the existing co-phase power-supply scheme, it saves an auto-transformer in terms of topology, reduces the current stress by 10.9% in terms of the current stress of the switching device, and reduces the power loss by 0.25% in terms of the entire system power loss, which will result in a larger amount of electricity being saved. All of this makes it a more suitable co-phase power-supply scheme for the AT power-supply mode.
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Milivoj Mandić, Ivo Uglešić et Viktor Milardić. « ELECTRIC RAILWAY POWER CONSUMPTION ». Journal of Energy - Energija 58, no 4 (16 septembre 2022) : 384–407. http://dx.doi.org/10.37798/2009584306.
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The electric railways is a specific consumer of the electric power system. For the purpose of using electric energy rationally and making adequate savings, efforts are made to optimize electric energy consumption of electric trains and other electric railway facilities. The work shows the train movement simulation algorithm which serves to determine primarily the mechanical and then also the electric power required for traction. The sections of the electrified tracks are supplied from the electric traction substation (TS) and, for the requirements of the electric traction calculation, an electric network is formed. Based on the maximum time table for a certain time period, calculation is done of the electric circumstances; electricity, voltage, electric power, as well as the total consumed electric energy. For the determination of the electric energy supply of the traction unit, movement resistances of the certain train on each section need to be calculated. Input data necessary for such a calculation are the tracks profile parameters, planned movement speeds on certain sections, and the properties of the train and the locomotive. Besides the train movement simulation model, the article also shows the analysis of impact factors on the electric energy consumption for the electromotor train which travels the Croatian suburban rails. The results are obtained by the train movement simulation algorithm, by virtue of which the locations of trains are calculated, as well as their mechanical and electric powers necessary for traction. The particular example of the supply of the existing SS serves for comparing the results obtained by electric traction calculation and measurement. Some of the results are given of the electric traction simulation for the Zaprešić SS at the supply of the suburban Podsused factory − Samobor − Bregana which is planned for construction.
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Lesnikov, Dmitriy Valentinovich. « Modeling of direct current traction power system with the consideration for earth conductivity ». Transport of the Urals, no 2 (2020) : 75–79. http://dx.doi.org/10.20291/1815-9400-2020-2-75-79.
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Nowadays, one of the main tasks facing the JSC Russian Railways is the increase of volumes of freight transportation. The solution of this task is directly connected with the increase of the load on traction power system devices and their strengthening, which is primarily related to railways electrified with direct current that are characterized by high traction currents. In order to assess the possibility to strengthen a railway section and reveal «bottlenecks» in traction power supply system it is necessary to create a mathematical model of traction power system that must consider parameters of a specific section including earth conductivity that affects the values of skin resistance, potential of railway network and stray currents. The paper proposes a mathematical model of direct current traction power system that represents a combination of a catenary model and a model of railway network. The model considers parameters of traction substations, connection scheme of catenary suspensions and possible influence of rails from adjacent tracks on each other.
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Bestemyanov, P. F., et A. E. Vanshin. « Stabilized Power Supply for Railway Automation Devices ». Russian Electrical Engineering 92, no 9 (septembre 2021) : 469–71. http://dx.doi.org/10.3103/s1068371221090042.
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KOSEKI, Takafumi. « Introduction : Innovations in Railway Power Supply System ». Journal of The Institute of Electrical Engineers of Japan 130, no 8 (2010) : 524–25. http://dx.doi.org/10.1541/ieejjournal.130.524.
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Sergeyev, Boris, Valeriy Sisin et Gennadiy Akkerman. « Autonomous power supply of railway automation devices ». IOP Conference Series : Earth and Environmental Science 403 (19 décembre 2019) : 012208. http://dx.doi.org/10.1088/1755-1315/403/1/012208.
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Lu, Qiwei, Zhixuan Gao, Bangbang He, Cheng Che et Cong Wang. « Centralized-Decentralized Control for Regenerative Braking Energy Utilization and Power Quality Improvement in Modified AC-Fed Railways ». Energies 13, no 10 (19 mai 2020) : 2582. http://dx.doi.org/10.3390/en13102582.
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This paper proposes a centralized-decentralized control strategy for regenerative braking energy utilization and power quality improvement in the modified AC-fed railway system with energy-storage-based smart electrical infrastructure. The proposal of a centralized-decentralized control strategy can enhance the ability to withstand and rapidly recover from disruptions, thus providing further guarantees for safe and reliable operation and energy conservation for railway systems. First of all, the description and control strategy of the modified railway system are outlined, and then the control principles and implementation process of the centralized control and decentralized control strategies are given. Moreover, a method of load power detection and regulated power reference calculation is proposed. Finally, the effectiveness of the proposed strategy is verified in a case of a modified railway system consisting of four traction substations and eight power supply sections. The results demonstrate that regenerative braking energy can be efficiently utilized in railways and that power quality can be improved using the proposed centralized-decentralized control strategy.
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Li, Xue Wu, et Peng Xiao Ji. « Railway Traction Power Supply System of Modeling and Simulation Optimization Research ». Advanced Materials Research 1055 (novembre 2014) : 312–15. http://dx.doi.org/10.4028/www.scientific.net/amr.1055.312.
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Revamping of electrified railway traction power supply is to improve the railway transport capacity and important measures to promote the development of national economy. As a result of the traction power supply voltage was higher, the simulation technology was applied to modification of the traction power supply system. For the development of research workers to reduce risk and funding has become an international practice. Traction power supply system and the modeling and simulation of the traction power supply capacity technology are discussed in detail. It points out the simulation technology in the development direction of expansion engineering in the application of traction power supply.
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Makasheva, Svetlana, Egor Mart'yanov et Evgeniy Sinkevich. « INTERACTIVE SIMULATOR FOR LEARNING ELECTRICAL SAFETY METHODS OF WORK IN RAILWAY POWER SUPPLY DEVICES ». Transport engineering 2022, no 4 (18 avril 2022) : 78–88. http://dx.doi.org/10.30987/2782-5957-2022-4-78-88.
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The study objective is to reduce the number of cases of electrical injuries at work.
Research methods. Modern software tools for the development of educational content are analyzed. Adobe Captivate software shell was chosen as the basis for the development of the interactive simulator. An algorithm and structure of all blocks of the simulator have been developed for training electrical personnel safe methods of work in electrical installations of railways. Based on the flow sheet “Checking the condition, adjustment and repair of the aerial frog”, an interactive simulator was developed, consisting of video presentations, text passages from regulatory documents, instructions and rules of work, test tasks, as well as video materials filmed at full-scale production in real conditions of Far Eastern Railway operation.
The novelty of the work: an interactive simulator for learning electrical safety methods of work on the contact network of AC railways is developed and patented.
Conclusions: an interactive simulator has been introduced at the Far Eastern Management for Energy Supply - a structural subdivision of Transenergo - a branch of OAO "Russian Railways", and is also used in the educational process when training students of the Department of Power Supply Systems at FESTU for the training program "Train Traffic Control Systems“ of the specialty ”Railway Power Supply".
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Et. al., Venkatasupura Vemulapati ,. « Prototype Model for High Speed Railway Power Supply System Suitable for Indian Traction Sub Stations using Multi Modular Converter ». Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no 10 (28 avril 2021) : 7211–22. http://dx.doi.org/10.17762/turcomat.v12i10.5610.
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As on 2020, India does not have any globally proven railway lines running with high-speed standards as above 250 km/h. Indian Railways looking at the prospect of high speed rail networks also known as bullet rail network in India. With the present Indian traction supply system which is based on the phase splitting or phase shifting method is not suitable for the high speed railway network unless we eliminate neutral sections as well as mitigating the power quality issues such as voltage unbalance, harmonics and high reactive power drawn from the utility grid. In this paper, Co-phase traction power supply system with zero neutral sections is proposed. Modular multilevel converter based three phase to single phase catenary system through a DC Link has been designed, simulated and laboratory prototype is made. A MATLAB simulation of the suggested method and droop characteristics based on load sharing between the two single phase parallel inverters had executed. The obtained results were satisfactory and shows that the proposed system is very much suitable for high speed railway.
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Mongkoldee, Kritsada, et Thanatchai Kulworawanichpong. « Optimal sizing of AC railway power conditioner in autotransformer-fed railway power supply system ». International Journal of Electrical Power & ; Energy Systems 127 (mai 2021) : 106628. http://dx.doi.org/10.1016/j.ijepes.2020.106628.
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Belov, D. O. « Forming professional reliability of railway power supply specialists ». Vestnik of Samara University. History, pedagogics, philology 30, no 1 (22 avril 2024) : 96–102. http://dx.doi.org/10.18287/2542-0445-2024-30-1-96-102.
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The high level of technological, technical, logistics, organizational and economic changes occurring in the railway industry determines the trajectory of development of professional training of specialists. The priority of safety issues in the context of the complex influence of occupational risks actualizes the scientific understanding of the problem associated with the substantiation of effective characteristics that allow one to withstand the cumulative influence of occupational risks, effectively develop in the professional community, maintaining a stable equilibrium state of the “man – technology – production environment” system. Analysis of research and methodological literature, experience of professional applied physical training at railway universities of the Russian Federation made it possible to identify areas of research aimed at bringing the indicators of psychophysical fitness of specialists into line with the conditions for the implementation of their professional activities. In the structure of professional competence of railway transport specialists, researchers highlight readiness for professional activity. At the same time, in today’s rapidly changing conditions of the professional world, it is necessary to form not only the current (basic) professionally significant qualities of a future specialist, but also to create conditions for the development of potential professional abilities, which will allow effectively confronting risk situations and ensuring the formation of self-regulation mechanisms. The quality that ensures the mobilization and activation of available funds, reserves, sources to achieve set goals, solve problems, and unlock opportunities in a certain area is reliability. In the article it is shown that convergence of play with learning determines the developmental effect of the game method. The complex nature of the gaming method allows to form indicators in the structure of professional reliability of railway power supply specialists.
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Xie, Shaofeng, Yiming Zhang et Hui Wang. « A Novel Co-Phase Power Supply System for Electrified Railway Based on V Type Connection Traction Transformer ». Energies 14, no 4 (23 février 2021) : 1214. http://dx.doi.org/10.3390/en14041214.
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Power quality and neutral section are two technical problems that hinder the development of electrified railway to high-speed and heavy railway. The co-phase power supply technology is one of the best ways to solve these two technical problems. At present, a V type connection traction transformer is widely used in a power frequency single-phase AC traction power supply system, especially in high-speed railway. In this paper, a new type of co-phase power supply system for electrified railway based on V type connection traction transformer is proposed. One single-phase winding in the V type connection traction transformer is used as main power supply channel, and three ports are used as compensation ports. Neutral section is no longer set with traction substation, and the train is continuously powered through. The independent single-phase Static Var Generators (SVGs) are used to compensate the three-phase imbalance caused by single-phase traction load. When necessary, the power factor can be improved at the same time. The principle, structure, control strategy, and capacity configuration of the technical scheme are analyzed in this paper, and the effectiveness of the scheme is verified by using the measured data of electrified railway. The advantage of this scheme lies in the universal applicability of the V type connection traction transformer, and the flexibility of the SVG device.
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Delelegn, Mebratu, Ravikumar Hiremath et Chandra Sekhar Reddy. « Power Quality Analysis of Ethio-Djibouti Railway Power Supply System ». International Journal of Electrical and Electronics Engineering 11, no 3 (25 mars 2024) : 155–64. http://dx.doi.org/10.14445/23488379/ijeee-v11i3p112.
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Haładyn, Szymon. « The Problem of Train Scheduling in the Context of the Load on the Power Supply Infrastructure. A Case Study ». Energies 14, no 16 (6 août 2021) : 4781. http://dx.doi.org/10.3390/en14164781.
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This article deals with the new challenges facing modernising railways in Poland. We look at the problem of the efficiency of the power supply system (3 kV DC) used in the context of the increasing use of electric vehicles, which have a higher demand for electricity than the old type. We present and characterise the power supply system in use, pointing out its weaknesses. We consider a case study. The load of the power supply network generated by the rolling stock used in Poland was examined using a microsimulation. A real train timetable was taken into account on a fragment of one of the most important railway line sections in one of the urban agglomerations. Then the results were compared with the results of a microsimulation in which old units were replaced by new trains. These tests were carried out in several variants. We found critical points in the scheduling of railway system use. Our results indicate that it is becoming increasingly necessary to take into account the permissible load capacity of the supply network in certain traffic situations in the process of timetable construction.
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Kuznetsov, Vitaliy, et Yuriy Kachan. « ABOUT THE EXPEDIENCY OF USING ELECTROCHEMICAL STORAGES IN POWER SUPPLY SYSTEMS FOR NON-TRACTION CONSUMERS OF RAILWAYS FROM RENEWABLE ENERGY SOURCES ». System technologies 6, no 131 (1 mars 2021) : 123–36. http://dx.doi.org/10.34185/1562-9945-6-131-2020-11.
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This paper focuses on the problem of analyzing expediency of using electrochemical storages in power supply systems for non-traction consumers of railways from renewable energy sources (RES). It is quite obvious that RES implementation in any national industry as a proper distributed energy source is too problematic if there is no possibility to accumulate it in good supply. The aim of this paper is to select the most appropriate electrochemical storage device for power systems for non-traction consumers of railways from RES. The methodology of research is based on modern methods of computational mathematics, statistics and information analysis using modern computer technology. Consequently, the analysis helps conclude that batteries are the most preferable for power lines. That especially concerns railway mains with RES use since the batteries have the best power characteristics.
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Szeląg, Adam. « Electrical power infrastructure for modern rolling stock with regard to the railway in Poland ». Archives of Transport 42, no 2 (14 juin 2017) : 75–83. http://dx.doi.org/10.5604/01.3001.0010.0529.
Texte intégralRésumé :
Implementing high-speed trains on Polish railway lines requires a new approach to the issue of power and energy supply via a 3 kV DC power system. Due to the control systems used, modern rolling stock equipped with asynchronous drive allows maintaining a set speed, as far as a locomotive’s power and voltage in a catenary allow it. Characteristics of traction vehicles with asynchronous drives enables run at voltage lower than the rated voltage, however, it entails decrease of consumed power (required for locomotives with power above 2 MW) and loss of motion dynamics. Modernisation of a railway power supply system conducted in Poland since the mid-1990s of the 20th century has intensified in the past couple of years (so-called MUZ-I program) due to the purchase of Pendolino trains, and it primarily include the main lines. A number of modernisation investments (lines E65, E20, E30) are implemented with co-financing from the EU funds. Due to the predicted trains’ speed (200 km/h and above), in order to fulfil the requirements specified in TSI, a power supply system on these lines should ensure achieving high parameters, that is supply of trains with current up to 3.2 kA, while the so-called mean useful voltage should not be lower than 2.8 kV. The article presents solutions introduced on Polish railway and aiming at adjusting the power supply used to the TSI requirements. The range of conducted modernisation works allows for conclusion that the process is in fact a re-electrification of railway power supply systems.
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Mukha, Andrii M., et Oleh I. Bondarr. « Reactive Power Compensation for Non-Traction Railway Consumers ». Problemy Kolejnictwa - Railway Reports 64, no 188 (septembre 2020) : 129–35. http://dx.doi.org/10.36137/1884e.
Texte intégralRésumé :
This paper deals with the problems of power supply efficiency for non-traction railway customers. Unlike public distribution networks, the non-traction power supply network is within the zone of influence of electromagnetic fields and the conductive influence of the distorted traction current. As a result, poor power quality and additional losses are typical for non-traction railway networks. Subsequently, conflicts due to the low quality of electricity may arise between the railway and its customers powered by the distribution networks of the railway. The influence of a reactive power compensation device on the voltage drop in a non-traction power line is investigated in the article. The implementation of reactive power compensation allows voltage losses during its transmission to the final consumer to be reduced by almost 5% and electricity losses by 3%. Keywords: non-traction consumer, power factor corrector, reactive power compensator, graph of electric network, nodal analysis
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Lawton, P., et F. J. Murphy. « Hong Kong mass transit railway power supply system ». IEE Proceedings C Generation, Transmission and Distribution 133, no 7 (1986) : 462. http://dx.doi.org/10.1049/ip-c.1986.0070.
Texte intégral
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Femine, Antonio Delle, Daniele Gallo, Domenico Giordano, Carmine Landi, Mario Luiso et Davide Signorino. « Power Quality Assessment in Railway Traction Supply Systems ». IEEE Transactions on Instrumentation and Measurement 69, no 5 (mai 2020) : 2355–66. http://dx.doi.org/10.1109/tim.2020.2967162.
Texte intégral
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Yu, Guo. « Design of Electric Power System for Xinhangcheng Station on Intercity Railway Connecting Line ». Journal of Physics : Conference Series 2409, no 1 (1 décembre 2022) : 012001. http://dx.doi.org/10.1088/1742-6596/2409/1/012001.
Texte intégralRésumé :
Abstract At present, the intercity railway station is getting bigger and bigger, represented by the Intercity Railway Xinhangcheng Station. Xinhangcheng Station of the Intercity Railway Link Line is a key station for the national railway underground passenger transport, the scale of the building is larger than that of ordinary subway stations, with a total of 6 floors, including communication, signal, information, escalator, screen door and other equipment. The layout and design of ventilation, water supply, and fire-fighting equipment are more complicated than subways. The station also includes areas related to station support and integrated development, therefore, new requirements are put forward for the design of the station power system. Therefore, it is very important to study a reasonable and feasible power design scheme. In this paper, to meet the needs of the intercity railway tie line underground station building, station supporting and integrated development of electricity consumption and electricity consumption independent of each other, a 10KV/0.4KV substation is set up on the ground floor and on the second floor of the station building to supply power to the station, a 10KV/0.4KV substation is set up on the east and west sides of the supporting area to supply power to the municipal supporting area, and integrated development of a 10KV/0.4KV substation is set up to supply power for integrated commercial development, meeting the needs of all parties.
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Jerzy, Wojciechowski, Syc Józef, Perzyński Tomasz et Łukasik Zbigniew. « Diagnostics of the 3 Kv DC Traction Power Network ». International Journal of Engineering & ; Technology 7, no 4.3 (15 septembre 2018) : 201. http://dx.doi.org/10.14419/ijet.v7i4.3.19735.
Texte intégralRésumé :
The railway traction network line is one of the technical elements ensuring proper operation of railway traffic. Due to its technical function and specificity, it is an essential element of the railway infrastructure. That is, why diagnostics of traction networks is a very important issue. In the article, the authors presented issues related to the diagnostics of 3kVDC traction networks. An analysis of traction network faults for a group of power supply areas was also presented. Additionally, calculations of damage indicators in a selected, representative power supply area are presented. On the basis of made an analysis authors proposed solutions aimed at minimizing breakdowns in traction networks.
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Shurova, Natalia, et Valerii Li. « Increase of energy efficiency of electric power distribution networks by adjustment of reactive energy consumption in a traction network ». MATEC Web of Conferences 239 (2018) : 01049. http://dx.doi.org/10.1051/matecconf/201823901049.
Texte intégralRésumé :
In the past few years, there has been a trend towards an increase in the volume of transportation by railway. At the same time, the load on the railway infrastructure increases, in particular, on the traction power supply system. It is necessary to solve the problem of increasing the energy efficiency of the external electric power supply system in the conditions of growing freight turnover and taking into account the uncertainty of the initial data. The paper considers one of the methods of strengthening the traction power supply system. Based on the results of the study, an algorithm was developed for selecting the installation sites and power of compensating devices in a traction network in the conditions of increasing freight turnover and under the condition of increasing the energy efficiency of the external power supply system of traction substations due to unloading of supply lines by reactive power and leveling the load in phases. This methodology includes predicting power consumption, determining the installation sites and power of compensating devices in the traction network under condition of uncertainty of the initial data, and then assessing the energy efficiency of the decision made. A calculation was carried out for the proposed algorithm for a section of the Far Eastern Railway which includes nine traction substations.
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Bosyi, Dmytro O., et Denys R. Zemsky. « Increasing Power Supply Efficiency for “Two Wire-Rail” Line Consumers ». Problemy Kolejnictwa - Railway Reports 64, no 188 (septembre 2020) : 93–102. http://dx.doi.org/10.36137/1881e.
Texte intégralRésumé :
The article is devoted to the problem of non-traction consumers power supply of AC railways. The low efficiency of energy transfer is caused by the design of a non-traction power supply line. The absence of bilateral power is typical for non-traction network 27,5 kV which consist of “two wire-rail” lines. This line is outdated technology, which does not correspond to modern requirements on the power quality, but used on AC railways with three-phase traction transformers. The purpose of the article is to investigate the methods of power supply improvements for non-traction consumers in terms of voltage unbalance, harmonic distortions and energy losses. Connection of the phasing device to delta winding traction transformer for bilateral supplying non-traction customers from network 27,5 kV is suggested in the article. The implementation of a method to increase the efficiency of electricity transmission in the non-traction network power supply allows to reduce power losses from 720 MWh / year to 441 MWh / year, the voltage unbalance from 1,9% to 1,3% and the total harmonic distortion from 8 % to 6 % respectively. Additionally, investment attractiveness of the decision was evaluated. Keywords: non-traction customers, two wire-rail line, phase coordinates, AC railway, power quality
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Holub, Halyna, Olexsandr Gorobchenko, Ivan Kulbovskyi, Sergey Goolak et Oles Haidenko. « Development of an innovative model for the inter-integration of the architecture of the intelligent computer environment of critical infrastructure facilities of the railway ». Technology audit and production reserves 6, no 2(74) (22 novembre 2023) : 20–27. http://dx.doi.org/10.15587/2706-5448.2023.291244.
Texte intégralRésumé :
The object of research is the processes of intelligent management of the computer environment of data objects of the critical infrastructure of railway transport. When developing an innovative model of deep mutual integration of the architecture of an intelligent computer environment for the management of objects in the power supply system of railway transport, the only urgent task is to solve the problems of efficient and reliable power supply of electricity for train traction to ensure the transportation process. The approaches, mathematical models and methods that became the basis for the creation of an innovative model and a new structure of the management system, the integration of the architecture of the computer environment of data of critical objects of the infrastructure of railway transport, meet the requirements of modernity and the strategy of sustainable development of the transport infrastructure. Management of an intelligent computer environment in the context of the railway power supply system is a complex process that includes the use of various technologies and strategies to optimize the functioning of systems, increase reliability, ensure efficient use of electricity, and ensure the transportation process. The basis of the creation of an intelligent computer environment is the principle of a single informational and synchronous space for the formation of primary information, which is an important concept in the development of intelligent control systems for the power supply system of railway transport. This principle requires that all parameters and data that are collected from different systems of power supply facilities should be combined in a single information space and be available for analysis and management in real time. This principle creates the basis for innovative solutions in the field of railway power supply system management, and the use of the Internet of Things, artificial intelligence, machine learning and deep learning allows the development of systems that meet modern requirements for the efficiency and reliability of energy systems. The use of the approach of deep mutual integration of the architecture of the computer environment is key in the possibility of automating the processes of data collection and analysis, as well as in improving the interaction between the components of the systems of power supply facilities of railway transport, the reliability and efficiency of the system, which makes it more flexible and adaptive to changes in load and working conditions. The research presented in the work can be used in practice in organizations, structural units and at the levels of the management system of critical infrastructure objects in railway transport, transport sector enterprises, which will allow a quick response to an emergency situation and switch to backup modes, ensuring reliability and availability of power supply in conditions of challenges.
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Tian, Zhongbei, Ning Zhao, Stuart Hillmansen, Shuai Su et Chenglin Wen. « Traction Power Substation Load Analysis with Various Train Operating Styles and Substation Fault Modes ». Energies 13, no 11 (1 juin 2020) : 2788. http://dx.doi.org/10.3390/en13112788.
Texte intégralRésumé :
The simulation of railway systems plays a key role in designing the traction power supply network, managing the train operation, and making changes to timetables. Various simulation technologies have been developed to study the railway traction power network and train operation independently. However, the interactions between the load performance, train operation, and fault conditions are not fully understood. This paper proposes a mathematical modeling method to simulate the railway traction power network with a consideration of a multi-train operation, driving controls, under-voltage traction, and substation fault modes. The network voltage, power load demands, and energy consumption according to the existing operation are studied. The hotspots of the power supply network are identified based on an evaluation of the train operation and power demand. The impact of traction power substation (TPSS) outage and a short circuit on the power supply network have been simulated and analyzed. The simulation results have been analyzed and compared with those of a normal operation. A case study based on a practical metro line in Singapore is developed to illustrate the power network evaluation performance.
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Yu, Kachan, et Kuznetsov V. « Features of operation of photovoltaic plants as a supplementary source of electricity for non-traction consumers of railway electric mains ». Theory and practice of metallurgy, no 6 (19 juin 2019) : 61–66. http://dx.doi.org/10.34185/tpm.4.2019.08.
Texte intégralRésumé :
Purpose. To determine the features of operation of photovoltaic stations as а supplementary source of electricity for non-traction consumers of railway power grids. The research methodology is based on modern methods of computational mathematics, statistics and information analysis using modern computer technology. Findings. The authors analyze the current prerequisites for the use of electricity obtained from non-traditional sources (photovoltaic stations) to supply non-traction consumers of railway power grids. The nature of the intensity of solar radiation was clarified due to meteorological observations for 2018, recorded using a SMIR pyranometer from KIRP & ZONEN, which is specially designed to record the flow of solar energy falling on a flat surface from the sun and sky in the wavelength range from 300 to 3000 nanometers (Nm), which has an intelligent interface, in the city of Vasylivka, Zaporizhia region with an interval of minutes. The total number of values was about 25,000. The data obtained are as follows: the lowest intensity of solar radiation during 2018 was 400 W / m2, and the highest - 1000 W / m2. The calculation of the choice of photovoltaic panels type PV-MLV 250 NS with a maximum power of 250 W for the completion of a specific photovoltaic station for installation in the specified region. The authors conclude that in order to provide reliable energy supply to non-traction consumers of railway power grids during the day from autonomous solar power plants, the latter must be provided with electricity (storage batteries) in quantities exceeding the required load by about 1.7 times. The originality is that the use of renewable energy sources in the power supply systems of non-traction consumers of railway transport, in particular photovoltaic installations, is proposed. Practical implications. Introduction of photovoltaic stations as a supplementary source of electricity for non-traction consumers of railway power grids in order to minimize electricity costs. Keywords: renewable energy sources, quality of electric energy, photovoltaic plant, power supply networks of railway transport, non-traction consumers of railway electric networks, electricity production, solar radiation intensity, storage batteries.
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Wang, Ying, Yueyang Xin, Ziyun Xie, Xiuqing Mu et Xiaoqiang Chen. « Research on Low-Frequency Stability under Emergency Power Supply Scheme of Photovoltaic and Battery Access Railway Traction Power Supply System ». Energies 16, no 12 (20 juin 2023) : 4814. http://dx.doi.org/10.3390/en16124814.
Texte intégralRésumé :
Photovoltaics and batteries can be connected to a traction power supply system through a railway power conditioner (RPC) to switch between different control strategies. This can address power quality issues or provide emergency traction for locomotives that unexpectedly lose power and even break through traditional energy barriers in the railway field, achieving a low-carbon power supply for railway energy, and a mutual backup with substations. However, methods to coordinate the control strategies of PV and the battery locomotive traction have not been clearly revealed, nor has the actual stability of the system. In this study, to address the above issues, an emergency power supply scheme is proposed for the first time that utilizes a dual-mode RPC inverter combined with a coordinated control strategy for the PV and battery, achieving the traction of locomotives. In addition, a one-dimensional impedance model was established for the PV system, battery system, locomotive (CRH3), and RPC projected onto the dq coordinate system, and the critical amplitude margin (CAM) was defined to quantitatively analyze the sensitivity and laws of different parameters concerning the low-frequency stability of the system. At the same time, impedance ratios and passive criteria were used to reveal the stability mechanism, and parameter adjustment criteria and design suggestions were put forward. Finally, the feasibility of the emergency power supply scheme of the “PV–battery locomotive network” coupling system and the correctness of the low-frequency stability study were verified using the Starsim semi-physical experiment platform.
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Li, Defang, Hao Zhang, Hui Yan, Xingjun Tian, Nanqing Wang et Zexuan Yuan. « Research on Fault Location for Direct Traction Network ». Journal of Physics : Conference Series 2215, no 1 (1 février 2022) : 012020. http://dx.doi.org/10.1088/1742-6596/2215/1/012020.
Texte intégralRésumé :
Abstract In view of the low accuracy of existing fault location methods for traction networks with longer power supply lines, the equivalent model of the traction network for double-track electrified railways is calculated, and the power supply lines and contacts are introduced on the basis of traditional traction network fault location methods. The parameter of grid equivalent impedance ratio proposes a modified uplink and downlink current ratio ranging method, which effectively solves the problem of accurate fault location of the double-track electrified railway direct-supply traction network. The RT-plus smart grid real-time digital simulation instrument is used to establish the traction power supply dynamics. The simulation test system is simulated and tested, and the test results show that the proposed algorithm has good feasibility and accuracy, and fully meets the engineering requirements.
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Chechenova, Liana. « Evaluation of Economic Efficiency upon Technologies Modernization Project at Railway Section Electrification ». Bulletin of scientific research results 2022, no 3 (22 septembre 2022) : 184–96. http://dx.doi.org/10.20295/2223-9987-2022-3-184-196.
Texte intégralRésumé :
Purpose: To evaluate the economic efficiency of contact network modernization project for the railway section of the St. Petersburg - Baltiyskaya power supply distance of the Oktyabrskaya Railway (OR). The study subject is the operation protocol for contact network modernization. Methods: Analysis basic methods are applied — target indicator statistical analysis of electrified section specific weight in the total operational length of public railway tracks; target indicator statistical analysis of railway line electrification. Results: The modernization of electrification technologies on the railway section of “St. Petersburg-Baltiyskiy” OR railway distance is justified. Implementation main stages for contact network modernization project are systematized. Economic effect being obtained from electrification technologies modernization is determined. Practical importance: The obtained results represent an applied character since they propose and justify measure series aimed at servicing effectiveness raise for the railway section servicing of the St. Petersburg-Baltiyskiy OR railway power supply distance.
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Pronevich, O. B., et V. E. Shved. « Algorithm of calculation and forecasting of functional safety indicators of railway power supply systems ». Dependability 18, no 3 (5 septembre 2018) : 46–55. http://dx.doi.org/10.21683/1729-2646-2018-18-3-46-55.
Texte intégralRésumé :
Acknowledgement: the authors express their personal gratitude to Prof. Igor B. Shubinsky, Doctor of Engineering, for his recommendations regarding the choice of the theoretical background that provided the foundation for the practical research, as well as hisadvice and valuable observations that contributed to this paper.Abstract. Aim. Uninterrupted transportation process is ensured by the highly dependable and safe power supply system of railway transport. In addition, the railway power supply system provides power to external consumers. A risk-oriented approach to railway transportation management requires an infrastructure risk management and safety system. The main purpose of risk management in this area is to improve the dependability and safety of railway infrastructure facilities [1, 2]. Additionally, given the growing numbers of intelligent information systems, as well as automated railway transportation management systems, the task of ensuring functional safety becomes very important. In most cases this problem is solved by introducing redundancy that is understood as an exceeding complexity of the system structure compared to the minimal values required for the performance of the specified task [3]. The simplest way of ensuring redundancy is by creating backup capabilities, particularly standby duplication within the system of functional units and components. In order to evaluate the safety of the railway transportation power supply systems it is required to calculate the functional safety indicators of their components and system as a whole taking into account the factor of redundancy. This approach will enable the optimal redundancy architectures and ensure compliance with the assigned level of general system safety. That requires taking into consideration the complex structure of the evaluated facilities: presence of diagnostics systems, right-side failures, wrong-side failures, as well as their random nature. The paper aims to develop an applied algorithm of calculation and prediction of functional safety indicators using the example of railway power supply systems that can be used in both manual and automated calculation.Methods. The power supply system evaluated for functional safety indicators is, from the functional point of view, a sequence of function implementations, while the failures of its components are random and some of them cause hazardous events. In this case, system analysis commonly involves Markovian and semi-Markovian methods, as well as graph methods. The advantage of these methods consists in the capability to evaluate the functional safety indicators of complex systems that go into many states, which is also typical for railway power supply systems.Result. This paper examines the application of graph semiMarkovian methods for calculation of stationary and non-stationary functional safety indicators for components of power supply systems taking into account redundancy and right-side failures. This algorithm allows calculating safety indicators using the example of power supply systems and includes a set of incremental actions aimed at constructing the state graph, calculation of the initial and intermediate graph factors. An example is provided of calculation of the functional safety indicators of a graph of a traction substation power transformer.
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Li, Guangyao, Jiaxin Yuan et Dongliang Gan. « Research on capacity optimization of new energy hybrid energy storage system of high-speed railway ». Journal of Physics : Conference Series 2728, no 1 (1 mars 2024) : 012012. http://dx.doi.org/10.1088/1742-6596/2728/1/012012.
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Abstract With the fast expansion of electrified railways, the need for energy is growing. Thus, improving railway coupling and interconnection, new energy, and energy storage is critical to support low-carbon and green railway development. Therefore, this paper proposes an optimal configuration method for the access capacity of wind power generation system (WPGS), photovoltaic power system (PVPS), and hybrid energy storage system (HESS) in the traction power supply system (TPSS) of high-speed railways. Firstly, the HESS’s mathematical model is developed, then the high-speed railway TPSS’s economic optimization operating model is built, and a HESS energy management approach is presented, taking the energy management strategy parameters and model capacity configuration parameters as the optimization variables. The mixed integer linear programming approach is used to resolve the actual example with the least daily operational cost of the high-speed rail system as the optimization goal, and the optimal capacity of WPGS, PVPS, and HESS is obtained. Finally, through comparison and analysis, it is verified that the economic benefit is the highest when the distributed complementary energy system covering WPGS, PVPS, and HESS is connected to the traction substation, and 10.47% of the daily expenditure is saved.
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Nguen, Van. « USE OF SMALL HYDROELECTRIC POWER STATIONS IN RAILWAY POWER SUPPLY SYSTEMS ». Modern Technologies and Scientific and Technological Progress 2018, no 1 (23 mars 2020) : 165–66. http://dx.doi.org/10.36629/2686-9896-2020-2018-1-165-166.
Texte intégralRésumé :
Recently there is a significant increase in power of renewables. In the report questions of application small hydroelectric power stations in the systems of power supply of the railroads
are considered.
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Xu, Xiang Zheng, et Wei Wan. « Research on Harmonic Detection Methods of Electrified Railway ». Advanced Materials Research 301-303 (juillet 2011) : 1740–43. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.1740.
Texte intégralRésumé :
This paper introduces the characteristics of the traction power system of electric railway, and explores the harms to the power system caused by electric railway and the necessity of harmonic suppression of traction power supply system. In order to achieve real-time detection and compensation for harmonic waves of electric railway traction power system, this paper provides an improved harmonic detection method with initial compensating angle of delay time. Detection method is simple, and has better real-time, it can be used to detect selective harmonic for electrified railway.
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Arsent'ev, Oleg, Grigory Shitenkov et Leonid Golovatiukov. « ELECTRICITY SUPPLY OF NON-TRACTION RAILWAYS CONSUMERS ». Bulletin of the Angarsk State Technical University 1, no 16 (27 décembre 2022) : 8–12. http://dx.doi.org/10.36629/2686-777x-2022-1-16-8-12.
Texte intégralRésumé :
The features of power supply to consumers receiving energy from the energy system of railway transport are considered; as an object of non-traction consumption, a weight measuring complex is considered; it was determined that the existing methods of supplying electricity to remote facilities in the railway zone have significant shortcomings and the development of new technical solutions is required to eliminate them
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Tan, Zihang, Chaozheng Xu, Zijian Yin, Xingjun Tian et Shijiao Lu. « Research on AT traction network relay protection model based on Feeding Section ». Journal of Physics : Conference Series 2310, no 1 (1 octobre 2022) : 012081. http://dx.doi.org/10.1088/1742-6596/2310/1/012081.
Texte intégralRésumé :
Abstract Relay protection for AT traction networks is the key to maintaining safe and reliable operation of high-speed railways. Existing relay protection in the electrical supply network of high-speed railways often ensures its reliability at the expense of its selectivity. The current reliability-first relay protection scheme no longer meets the current safety requirements for high-speed railway operations, so the need to select a more optimised relay protection scheme is crucial. The fully parallel AT power supply method used in high-speed railways has the Feeding Section as the basic unit. Optimising the relay protection mode of the Feeding Section is of great help in optimising the AT traction network relay protection system. In this paper, the IED model for the protection of the entire Feeding Section is established by building a model based on the relevant rules of the IEC 61850 communication protocol and configuring the parameters of each logical node, starting from the actual project of the high-speed railway. The OPNET software was used to carry out simulations to prove that the IED model for line protection based on the supply arm can effectively balance the reliability and selectivity of relay protection.
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Tryapkin, Evgeny, Ivan Ignatenko et Maxim Keino. « Development of “digital substation” technology for power supply of railways ». MATEC Web of Conferences 239 (2018) : 01051. http://dx.doi.org/10.1051/matecconf/201823901051.
Texte intégralRésumé :
The paper considers the application of the “Digital Railway” project at the traction substation. The “Digital Railway” project should become a centralized system uniting the programs for the control of railway elements. In the traction power supply system, the application of digital technologies is often understood as the application of data transfer protocols of the International Energy Commission “IEC 61850”. The substations that switched to this information protocol are usually called “digital”. An attempt to introduce the “digital substation” technology only by completing a set of corresponding equipment can give a negative result of its application. The efficiency achieved through the technical upgrading of equipment (reduction of losses for own needs, reduction of electromagnetic influence, reduction of analog signal input channels, reduction in the number of cable products used, and improvement of the measurement accuracy class) may not be sufficient to pay for the project. The qualitative integration of all involved services in a single information process of monitoring and controlling the digital substation will increase the efficiency of its application. As a positive experience when considering the use of digital technologies in traction power supply systems, one can cite the Automated system for monitoring the railway transport infrastructure developed and implemented by the staff of the Far Eastern State Transport University at a number of traction substations of the Far Eastern operating domain and at the 2ES5K “Ermak” electric locomotive. In addition, this system already has a support of IEC 61850 protocols.
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Bulatov, Yuri, Andrey Kryukov et Grigory Arsentyev. « Application of energy routers in railway power supply systems ». MATEC Web of Conferences 239 (2018) : 01047. http://dx.doi.org/10.1051/matecconf/201823901047.
Texte intégralRésumé :
The development of electric power industry requires transition to the technological platform, encouraging implementation of smart grids. To set up these grids it is necessary to apply smart technologies of power supply system control modes, as well as interfaces, ensuring the connection of renewable energy sources. These interfaces may be represented by energy routers. The paper discusses the results of simulating emergency modes, caused by short circuits in 10 kV and 0.4 kV grids of non-traction users, connected via energy routers to the railway power supply system. The studies were performed in MATLAB system. Simulation results showed that the application of controlled energy routers for the non-traction user power supply completely removes electric power quality problems, allows for reliable integration of distributed generation plants into the power supply system, and limits short circuit currents and reduces the depth of the AC failure.
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Yu, Kachan, et Kuznetsov V. « About technical and economic indicators of wind and photoelectric stations use in the systems of network consumer railway supply systems ». Theory and practice of metallurgy, no 6 (21 septembre 2019) : 68–74. http://dx.doi.org/10.34185/tpm.5.2019.09.
Texte intégralRésumé :
Purpose. To analyze the technical and economic indicators of the use of wind and photovoltaic stations in the power supply systems of non-traction consumers of railway power grids. The research methodology is based on modern methods of computational mathematics, statistics and information analysis using modern computer technology. Findings. The authors analyze the current prerequisites for the use of electricity generated from renewable sources (wind and photovoltaic stations) to supply non-traction consumers of railway power grids. The authors note that for reliable power supply to non-traction consumers in the presence of accidental wind flow or intensity of solar radiation, the capacity of wind and photovoltaic plants will need to be significantly overestimated, which leads to a significant increase in capital costs for construction. The paper presents examples of implementation of options for the construction of the above wind and photovoltaic stations for the variable nature of wind speed and intensity of solar radiation for specific regions of Ukraine (Vasylivka, Zaporizhia region). The authors present variants of the basic schemes of wind, solar and combined electric power supply systems for non-traction consumers. Information on technical and economic indicators of the most common domestic photo modules and wind turbines on the Ukrainian market is provided. The originality of the work is reflected in the examples of the introduction of options for the construction of wind and photovoltaic stations for the variable nature of wind speed and intensity of solar radiation for specific regions of Ukraine. Practical implications. The above calculation of the cost of the required number of power sources at wind, solar and combined power plants helps to choose the least expensive option for the introduction of renewable energy sources for non-traction consumers of railway networks. Keywords: renewable energy sources, photovoltaic installation, railway power supply networks, non-traction consumers of railway power grids, electricity production, solar radiation intensity, wind flow rate, capital expenditures.
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Kryukov, A. V., K. V. Suslov, A. V. Cherepanov et I. A. Fesak. « The use of cable power lines in power supply systems of railways ». Вестник Северо-Кавказского федерального университета, no 3 (102) (2024) : 18–25. http://dx.doi.org/10.37493/2307-907x.2024.3.2.
Texte intégralRésumé :
Introduction. Overhead power lines are traditionally used to connect railway traction substations to 110-220 kV networks. This approach has a number of disadvantages that can be eliminated when using 110-220 kV cables with molecular cross-linked polyethylene insulation in external power supply systems for traction substations. Goal. To develop digital models to determine the modes of railway power supply systems with power supply to traction substations via cables. Materials and methods.. Methods of multiphase modeling of electrical power systems and the Fazonord software product, version 5.3.4.5–2024 were used. Results and discussion. A comparison of the 110 kV AS-300 overhead line and a cable of a similar cross-section showed that in the case of a cable line, the standard deviations of voltages on the current collectors of electric locomotives were reduced by approximately 75%. Negative sequence asymmetry is reduced by 3...5 times, however, due to capacitive generation by cables, currents at low loads and losses in power lines increase. Conclusion. The developed digital models can be used in design. The modeling technique is universal and can be used to calculate the modes of power supply systems of any configuration and traction networks of various designs.
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Chernov, Y. A., N. Yu Dmitrieva et O. Yu Kokorina. « POWER SUPPLY SYSTEM WITH THREE-PHASE TRANSFORMERS FOR HSR ». World of Transport and Transportation 15, no 1 (28 février 2017) : 48–62. http://dx.doi.org/10.30932/1992-3252-2017-15-1-5.
Texte intégralRésumé :
[For the English abstract and full text of the article please see the attached PDF-File (English version follows Russian version)].ABSTRACT The article presents a schematic diagram of a traction substation of the 2x25 kV power supply system with three-phase transformers and a vector voltage diagram for high-speed lines. Power supply systems 2x25 kV with single-phase and three-phase transformers are compared, the power of three-phase transformers for high-speed main lines is recommended. And all this taking into account the new special technical conditions that are worked out for the design, construction and operation of Russian HSR. Keywords: railway, high-speed railway, traction substation, 2x25 kV power supply system, three-phase transformer, single-phase transformer, special technical conditions.
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Mariscotti, Andrea. « Characterization of Power Quality transient phenomena of DC railway traction supply ». ACTA IMEKO 1, no 1 (10 juillet 2012) : 26. http://dx.doi.org/10.21014/acta_imeko.v1i1.17.
Texte intégralRésumé :
<span style="font-size: 10.0pt; mso-bidi-font-size: 12.0pt; font-family: ";Minion Pro";; mso-fareast-font-family: ";Times New Roman";; mso-bidi-font-family: ";Times New Roman";; mso-ansi-language: EN-GB; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;" lang="EN-GB">DC railways are considered as an example of a complex distribution network, featuring distributed supply and moving loads. The Power Quality phenomena affecting traction voltage are many, steady and transient, depending on the converter operations at substations and on-board vehicles. A classification is proposed and a discussion follows of the correct methods for their quantification, with reference to related standards and to the vast background related to ac networks. The characterization of PQ is related on one side to ripple and fluctuation of the pantograph variables for supply purposes, and on the other side to the appearance of specific components relevant for interference to signalling on the track. Considerations and conclusions are based on a large amount of measured waveforms, recorded on the Italian railway networks, and are aimed at contributing to the forthcoming standards on traction supply quality.</span>