Improving the Controllability of the Infrastructure in AC-Fed Railways With Neutral Zones

2014 ◽  
Author(s):  
Eduardo Pilo ◽  
Sudip K. Mazumder
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Electronic Devices ◽  
Power Electronic ◽  
Electrical Grids ◽  
Supply Systems

This paper presents an enhancement to the electrical infrastructure that applies to those AC railway power supply systems which have neutral zones. The proposed upgrade allows an improved degree of controllability of the infrastructure, making it possible to perform power routing in traction electrical grids. The modified system consists on the addition of controlled power electronic devices connected in parallel to both sides of the neutral zones. The paper discusses the advantages of such a system in a real section of the high-speed Madrid-Barcelona.

Research on the Influence to Power System Protection with Harmonic of Power Electronic Devices

2011 ◽  
Vol 317-319 ◽  
pp. 1263-1266
Author(s):  
Xue Song Zhou ◽  
Jin Liu ◽  
You Jie Ma
Keyword(s):  
Power System ◽  
Power Supply ◽  
Distribution Systems ◽  
Electronic Devices ◽  
Power System Protection ◽  
Power Electronic ◽  
Quality Requirements ◽  
System Protection ◽  
Supply Systems ◽  
Operation Characteristics

With the development of science and technology, higher and higher quality requirements were needed by the electrical consumers about the power energy in power supplying and distributing. For this objective, many kinds of power electronic equipments are applied in power supply systems and distribution systems in order to improve the system running stability with their rapid response operation characteristics. But at the same time, the power electronic equipments may generate some hidden dangers that can not be overlooked to the system, particularly to the reliability of protection.

Ensuring electrical safety of power supply systems of electrified AC railways for highspeed lines

2018 ◽  
Vol 77 (6) ◽  
pp. 337-346 ◽  
Author(s):  
A. B. Kosarev ◽  
A. V. Barch ◽  
E. N. Rozenberg
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Structural Features ◽  
Electrical Safety ◽  
Safe Operation ◽  
Ballastless Track ◽  
Conventional Structure ◽  
Artificial Earth ◽  
Earth Connection ◽  
Supply Systems

Abstract. High-speed railways are fast-growing and promising type of traffic. In Russia development of high-speed railway service is associated with the solution of a number of problems, including infrastructure. Authors propose to use earth connection of the railway catenary with the help of an artificial earthing switch on currently designed high-speed line Moscow—Kazan for 2×25 kV power supply system. Taking into account requirements for electrical safety conditions for maintenance of the track and earthed catenary supports, paper justifies method for calculating allowable voltages of rail—earth points and supports of catenary. Methods takes into account structural features of ballastless track superstructure used for high-speed lines. It is estimated that the voltages admissible under the electrical safety conditions are random in nature and distributed logarithmically normal. When calculating probability of safe operation, one should take into account random nature of both permissible stresses and those actually occurring on the track. It is estimated that the probability of safe operation in traction networks of sections with ballastless track superstructure does not exceed a similar value in electrified sections with the conventional structure of a ballast prism. Feasibility of using a 2×25 kV earth system using an artificial earth connection is confirmed, recommendations on its use are given. Authors substantiate allowable values of the rail—earth voltage and catenary supports, which practically exclude the occurrence of hazardous situations for personnel maintaining the track in sections with ballastless track superstructure.

scholarly journals Фотовольтаические характеристики светодиодов с двумя последовательными p-n-переходами

2021 ◽  
Vol 47 (1) ◽  
pp. 47
Author(s):  
А.А. Соколовский ◽  
В.В. Моисеев
Keyword(s):  
Low Power ◽  
Spectral Range ◽  
High Power ◽  
Power Supply ◽  
Output Voltage ◽  
Optical Radiation ◽  
Electronic Devices ◽  
Power Electronic ◽  
Direct Power ◽  
Photovoltaic Characteristics

In this work, we investigated the photovoltaic characteristics of high-power IR LEDs manufactured by OSRAM GmbH based on structures with two vertically stacked p-n junctions. The spectral range of operation of PVTs based on LEDs with different radiation wavelengths was determined, and it was shown that the efficiency of photovoltaic conversion in them reaches more than 30% at a wavelength of 808 nm. The high (up to 2.6 V) output voltage of such converters allows them to be used for direct power supply of low-power electronic devices with optical radiation.

New Surge Counter for the ZnO Surge Arrester in Traction Power Supply Systems of High Speed Railway

2018 ◽  
Vol 138 (2) ◽  
pp. 69-75 ◽  
Author(s):  
Tetsushi Watanabe ◽  
Tomohiro Owaku ◽  
Masayuki Seto ◽  
Hitoshi Hayashiya ◽  
Yusuke Takido ◽  
...  
Keyword(s):  
Power Supply ◽  
High Speed ◽  
High Speed Railway ◽  
Traction Power Supply ◽  
Supply Systems ◽  
Traction Power

scholarly journals Determination of optimal location for installation of symmetry facilities in 0.4 kV power supply systems with motor-drive load

2018 ◽  
Vol 58 ◽  
pp. 03014
Author(s):  
Victoria Romanova
Keyword(s):  
Power Supply ◽  
Asynchronous Motor ◽  
Optimal Location ◽  
Economic Feasibility ◽  
Motor Drive ◽  
Capacity Loss ◽  
Electrical Grids ◽  
Cross Platform ◽  
Supply Systems

This article considers the issue for creation of computer-aided program designed for determination of optimal location for installation of symmetry facilities in 0.4 kV power supply systems with motor-drive load in conditions of asymmetry of voltages. The developed program is implemented by means of C# programing language in Microsoft Visual Studio 2012 programming environment using the embedded cross-platform data base SQLite. The program is designed for making electrotechnical calculations during designing, modernization and operation of electrical grids with available motor drive load. It ensures plotting of schematic circuits for 0.4 kV power supply system sections with installed symmetry facilities. The program will enable quick and exact calculation of power capacity loss, determination of economic feasibility for taking special measures to eliminate the asymmetry of voltages, and to determine optimal application and location of symmetry facilities. Using the program in motor-drive load power supply systems will enhance the asynchronous motor reliability and efficiency.

scholarly journals Energy-Storage-Based Smart Electrical Infrastructure and Regenerative Braking Energy Management in AC-Fed Railways with Neutral Zones

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4053 ◽  
Author(s):  
Zhixuan Gao ◽  
Qiwei Lu ◽  
Cong Wang ◽  
Junqing Fu ◽  
Bangbang He
Keyword(s):  
Energy Storage ◽  
Energy Management ◽  
Power Supply ◽  
Control Algorithm ◽  
Power Supply System ◽  
Electronic Devices ◽  
Supply System ◽  
Regenerative Braking ◽  
Energy Management System ◽  
Power Electronic

This paper presents a modified power supply system based on the current alternating current (AC)-fed railways with neutral zones that can further improve the eco-friendliness and smart level of railways. The modified system complements the existing infrastructure with additional energy-storage-based smart electrical infrastructure. This infrastructure comprises power electronic devices with energy storage system connected in parallel to both sides of each neutral zone in the traction substations, power electronic devices connected in parallel to both sides of each neutral zone in section posts, and an energy management system. The description and functions of such a modified system are outlined in this paper. The system allows for the centralized- and distributed-control of different functions via an energy management system. In addition, a control algorithm is proposed, based on the modified system for regenerative braking energy utilization. This would ensure that all the regenerative braking energy in the whole railway electrical system is used more efficiently. Finally, a modified power supply system with eight power supply sections is considered to be a case study; furthermore, the advantages of the proposed system and the effectiveness of the proposed control algorithm are verified.

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