scholarly journals Improving the quality of voltage in the system of traction power supply of direct current

2015 ◽  
Vol 35 (3) ◽  
pp. 63-70 ◽  
Author(s):  
Viktor G. Sychenko ◽  
Dmitry O. Bosiy ◽  
Eugene M. Kosarev
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Power Supply System ◽  
Heavy Traffic ◽  
Supply System ◽  
Traction Network ◽  
Traction Substations ◽  
Traction Power Supply ◽  
Traction Power

Purpose of the work is improved approaches to ensure the required quality parameters of voltage in the traction network based on modern technologies and equipment in the application of power distribution system. Actuality. The introduction of high-speed traffic, increase weight standards Train necessitates increasing the carrying capacity of railways. Often the carrying capacity of existing sections electrified at 3.0 kV DC power supply unit limits. Such limitations include voltage decrease on the electric current collector below the allowable value for the normal operation of 2700 (2900 for high-speed V) and heating the contact wires, thereby losing their mechanical strength. Existing power supply system of RS, which have considerable installed traction substations, can not provide the required level of power density traction network for high-speed movement within 1.5 - 2 MW / km and, respectively, the required voltage quality. At the same time, the daily loading of a powerful traction substations in providing intensive schedule of trains does not exceed 20-25%, while the energy loss in traction network peak load increases and reaches 10-15% of the energy consumed. Thus, the existing system of power traction networks is not sufficiently effective and economical, even with the application of existing methods to strengthen them. In our view, the main limiting factor for a given quality of voltage in the traction network is the use of centralized power. From this, the development of measures to improve the quality of voltage in the traction network in the implementation of high-speed traffic in a growing scarcity of energy resources is an urgent task. Scientific novelty. Using distributed power supply system with adjustable supply points combined into intelligent power supply, which enables adaptive change the characteristics of the transfer, conversion and consumption and optimize the mode of functioning of the traction power supply is suggested for improving the quality of voltage in the traction network in the implementation of high-speed and heavy traffic. Practical significance. Improving the quality of voltage in the traction network by using the proposed circuit design traction power supply will ensure the desired mode voltage and power characteristics of the traction network in the implementation of high-speed and heavy traffic while reducing electricity losses by 20-30%.

scholarly journals Increase of energy efficiency of electric power distribution networks by adjustment of reactive energy consumption in a traction network

2018 ◽  
Vol 239 ◽  
pp. 01049 ◽  
Author(s):  
Natalia Shurova ◽  
Valerii Li
Keyword(s):  
Energy Efficiency ◽  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Traction Power Supply System ◽  
Traction Network ◽  
Traction Substations ◽  
Compensating Devices ◽  
Traction Power Supply ◽  
Traction Power

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.

Development of software elements for improvement of calculation of traction power supply system

2021 ◽  
pp. 64-68
Author(s):  
Ivan Vladimirovich Ignatenko ◽  
◽  
Evgeniy Yuryevich Tryapkin ◽  
Sergey Anatolyevich Vlasenko ◽  
◽  
...  
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Power Supply System ◽  
Heavy Traffic ◽  
Supply System ◽  
Software Complex ◽  
Software Products ◽  
Traction Power Supply System ◽  
Traction Power Supply ◽  
Traction Power

Nowadays KORTES remains the main software complex for calculation of traction power supply system. However, in regard with the development of software and hardware facilities and the necessity to gain precise results the most important task is the improvement of separate software products aimed at refinement of calculation and solution of such tasks as thermal processes in traction power supply system, change of parameters at high-speed and heavy traffic and etc. The paper presents an algorithm developed for power supply system of mainline railway section, which allows calculating required power of transformers installed in traction substation not only for classic, but also for other schemes of connection of transformer winding.

scholarly journals A Novel Co-Phase Power-Supply System Based on Modular Multilevel Converter for High-Speed Railway AT Traction Power-Supply System

Energies ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 253
Author(s):  
Si Wu ◽  
Mingli Wu ◽  
Yi Wang
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Power Supply System ◽  
Supply System ◽  
High Speed Railway ◽  
Traction Power Supply System ◽  
Traction Power Supply ◽  
Supply Mode ◽  
Power Supply Mode ◽  
Traction Power

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.

scholarly journals Methodology for selecting installation sites for automatic power redundancy systems of DC traction substations

2021 ◽  
pp. 63-66
Author(s):  
A. L. Kashtanov ◽  
◽  
Yu. V. Plotnikov ◽  
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Energy Effect ◽  
Traction Power Supply System ◽  
Traction Substations ◽  
Traction Power Supply ◽  
Efficiency And Reliability ◽  
Traction Power

The paper presents a method for selecting the installation locations of power reservation systems of traction substations to reduce electricity losses in the system of traction power supply of DC railways. The analysis of the main criteria affecting the efficiency and reliability of the DC traction power supply system is carried out. The algorithm for selecting the installation locations of power reservation systems has been developed, which allows selecting traction substations that provide the greatest energy effect during the installation of systems

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