New energy-based hybrid bidirectional interactive direct-current traction power supply system

Abstract

A new energy-based hybrid bidirectional interactive direct-current traction power supply system is provided with two traction substations, and each traction substation comprises transformers, rectifiers, bidirectional alternating current-direct current (AC-DC) converters, a direct-current bus, a contact system, rails and a section post. A direct-current new energy system which comprises an electric automobile charging and discharging system, a distributed power supply and more than one low-voltage direct-current micro-grid is arranged on the direct-current bus between the two neighboring traction substations, and is connected with the direct-current buses of the two neighboring traction substations through a high-voltage direct-current bus, so that a direct-current loop micro-grid is formed in a power supply section, wherein the electric automobile charging and discharging system comprises more than one bidirectional direct current-direct current charger-discharger which is used for connection with the power cells of electric automobiles. The new energy-based hybrid bidirectional interactive direct-current traction power supply system realizes the effective utilization of distributed new energy and the recovery of the braking energy of electric locomotives; the fluctuation of the voltage of the direct-current bus is reduced, and thereby the reliability of the power supply of the direct-current traction power supply system is enhanced.

Description

technical field [0001] The invention relates to a direct current traction power supply system. In particular, it relates to a hybrid bidirectional interactive DC traction power supply system based on new energy, which combines a distributed power source, an electric vehicle charging and discharging system based on power exchange, and a DC traction power supply system. Background technique [0002] With the rapid development of economy and urbanization, energy crisis, environmental pollution and traffic congestion have become serious problems facing the world today. Urban electrified transportation vehicles (subway, trams and trolleybuses) and electric vehicles can alleviate the increasingly serious urban traffic congestion, reduce the consumption of limited fossil fuels, reduce air pollution, achieve energy conservation, emission reduction and sustainable urban development, are The main means of transportation for the vigorous development of cities in the future. [0003] ...

AI Technical Summary

Problems solved by technology

[0009] Distributed power supply stand-alone access costs are high and control is difficult

Compared with the large power grid, it is an uncontrollable source, so the large power grid often adopts a limited and isolated way to deal with distributed power in order to reduce its impact on the large power grid, which greatly limits the use of distributed power

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