A Bidirectional Interactive High Voltage DC Traction Power Supply System for Electrified Railway

Abstract

A high-voltage direct-current tractive power supply system of a bidirectional interactive electrified railway is provided with a plurality of traction substations. Each traction substation is provided with first transformers connected onto an alternating-current bus and a plurality of second transformers connected onto the alternating-current bus, each first transformer is connected with a high-voltage rectifier or a first high-voltage bidirectional alternating current-direct current converter, each second transformer is connected with a second high-voltage bidirectional alternating current-direct current converter, the high-voltage rectifiers or the first high-voltage bidirectional alternating current-direct current converters and the second high-voltage bidirectional alternating current-direct current converters are connected onto a high-voltage direct-current bus of the corresponding traction substation, each high-voltage direct-current bus is connected with an electric locomotive through a catenary and a steel rail, a section post connected with the corresponding high-voltage direct-current bus is arranged on the catenary of each traction substation, and a direct-current new energy system composed of an electromobile charging and discharging system, a distributed power supply and a plurality of low-voltage direct-current microgrids is arranged on the high-voltage direct-current bus between every two adjacent traction substations. Power supply reliability of the high-voltage direct-current tractive power supply system is improved.

Description

technical field [0001] The invention relates to a DC traction power supply system. In particular, it relates to a bidirectional interactive electrified railway high-voltage DC traction power supply system with high power quality for electric railway power supply that combines a distributed power supply, battery swap-based electric vehicle charging and discharging system and a high-voltage DC traction power supply system. Background technique [0002] With the rapid development of economy, energy crisis and environmental pollution have become serious problems facing the world today. Vigorously developing electrified railways and electric vehicles can reduce the consumption of limited fossil fuels, reduce air pollution, and achieve energy conservation and emission reduction. [0003] With the development of high-speed and heavy-duty railways and the expansion of the scale of electrified railways, many problems have been exposed in the existing single-phase power frequency AC ...

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Problems solved by technology

[0014] The technical problem to be solved by the present invention is to provide a two-way interactive high-voltage DC traction power supply system for electrified railways, using the high-voltage DC traction power supply system to solve the problems of negative sequence, harmonics, stability and excessive Equivalence issues, realize the effective utilization of distributed power sources and the recovery of braking energy of electric locomotives, reduce the fluctuation range of the DC voltage of the high-voltage DC traction power supply system, improve the power factor of the main substation on the AC side of the high-voltage DC traction power supply system, and reduce harmonics. Improve the reliability of high-voltage DC traction power supply system and reduce the construction cost of electric vehicle charging system

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