IMPROVING THE EFFICIENCY OF HIGH-SPEED RAILWAY THROUGH THE USE OF THE DC OVERVOLTAGE
Journal Title: Збірник наукових праць Українського державного університету залізничного транспорту - Year 2018, Vol 180, Issue 14
Abstract
The majority of CIS railways are electrified on DC with a voltage in the contact network of 3 kV. However, such a voltage is not optimal either for power supply devices or for electric rolling stock. It is a compromise solution, determined by the cost of energy losses in such a system and the cost of its devices. An increase in the voltage in the contact network of a direct current, for example, up to 6 or 12 kV or more, in order to reduce the energy losses in the system under the existing principles of regulating the operating conditions of the emitter. p.s. leads to a significant increase in the cost of electrical equipment and traction engines. It is characteristic that the noted shortcomings of the DC traction system of 3 kV are due to the fact that there is a direct electrical connection between the voltage of the contact network and the voltage of the traction electrical equipment. If this connection is eliminated and it is possible to regulate voltages on traction engines within wide limits, it will be possible to increase the voltage in the contact network several times to significantly improve the technical and economic performance of the DC traction system. New possibilities in this respect are opened by the use of pulsed energy conversion systems, which eliminate the direct connection between the voltages of the contact network and traction motor. The use of thyristor control of the operating modes of traction motors allows smoothly adjusting in a wide range the voltage applied to the traction motors, regardless of the voltage in the contact network. Perspective are systems in which brushless motors are used as traction motors - asynchronous or synchronous (gate valves). If the DC link traction system raises the voltage in the contact network by 2-3 times, then when using the thyristor control of the traction engine operation, in addition to saving energy during start-up, reducing the number of control equipment, the cost of construction and operation of the power supply system will decrease.
Authors and Affiliations
Pavlo Kharlamov, Kirilo Parpura, Olena Kharlamova
Keywords
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