Tractive power supply system and method

Abstract

The embodiment of the invention provides a tractive power supply system and method. The tractive power supply system comprises a PWM (Pulse Width Modulation) current transformation module and an energy storage module, wherein the PWM current transformation module is used for transforming alternating current in an alternating current network into direct current, and introducing the transformed direct current into a direct current traction network, and the energy storage module is used for receiving the direct current from the direct current traction network and storing the direct current, or introducing the stored electric energy into the direct current traction network in the form of the direct current. The method comprises the following steps of: transforming the alternating current in the alternating current network into the direct current, and introducing the transformed direct current into the direct current traction network by the PWM current transformation module; when the system is just started or the electric energy in the direct current traction network is excessive, receiving the direct current from the direct current traction network and storing the direct current by the energy storage module; and when the current requirement in the direct current traction network is greater than a rated range of PWM, introducing the stored electric energy into the direct current traction network in the form of the direct current by the energy storage module.

Description

technical field [0001] The invention relates to the technical field of urban rail vehicles, in particular to a traction power supply system and method. Background technique [0002] Urban rail transit, referred to as urban rail transit for short, has always played the role of the backbone of urban passenger transport in many large cities. The term urban rail transit covers a wide range of categories, including urban railways, suburban railways, underground railways, light rail transportation, urban trams, monorail transportation, maglev lines, airport connection railways, new transportation systems, etc. Most urban rail transit uses electricity as energy, so urban rail transit has the advantages of energy saving, land saving, large transportation capacity, all-weather, no pollution (or less pollution) and safety, etc. It is a green transportation system and conforms to the principle of sustainable development. And as the name suggests, urban rail transit is a transportation...

AI Technical Summary

Problems solved by technology

[0004] However, due to the unidirectional flow of diode energy, the use of diodes to achieve electrical energy conversion has the following defects: due to the unidirectional flow of diode energy, when the train is in the regenerative braking state, most of the energy cannot be recovered and can only be recovered by the ground or On-board braking resistors are dissipated as heat

This way of energy consumption not only causes a great waste of energy, but also causes the platform and underground tunnels to accumulate heat and increase the temperature, which puts a lot of pressure on the cooling system

In some special locations, it is even necessary to increase tunnel ventilation for heat dissipation, resulting in further energy consumption

In addition, due to the heavy weight of the braking resistor itself, it also brings additional load burden to the vehicle

In short, the power conversion based on diode rectification technology is often accompanied by a large amount of energy waste, and the energy utilization efficiency is low.

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