Braking system of electric locomotive based on high-power inverter

Abstract

The invention relates to the technical field of the braking of electric locomotives, particularly to a braking system of an electric locomotive based on a high-power inverter. Through a vehicle control unit, an inversion feedback system of regenerated energy is united with an eddy braking system together. The inversion feedback system of regenerated energy is adopted, when the electric locomotive brakes, a regeneration braking system preferentially supplies energy needed by eddy braking, and returns surplus energy to an electric grid. The braking system solves the problems that when only the inversion feedback system of regenerated energy is adopted, the utilizing rate of the energy returned to a traction network is low, and the voltage of the electric grid is increased, so that the power supply equipment of power substations is influenced; when only the eddy braking system is adopted, because the kinetic energy of a moving object is converted into heat energy and dissipates during eddy braking, a braking device warms, and demagnetization occurs on a permanent magnet, so that the braking fails. Through the adoption of the braking system disclosed by the invention, loading of the electric grid and loading of elements can be relieved, and besides, the utilizing rate of energy is increased, and the safety performance of the braking of the electric locomotive can be improved.

Description

technical field [0001] The invention relates to an electric locomotive braking system, in particular to an electric locomotive braking system based on a high-power inverter. Background technique [0002] Urban rail trains have the characteristics of large number of stations, short distances, high running speed, frequent starting and braking, etc. The train will lose a lot of kinetic energy when braking. At present, the braking methods used in urban rail transit are generally divided into resistance braking, regenerative braking and air braking. During operation, resistance braking and regenerative braking are the main braking methods, and air braking is auxiliary. At higher speeds both resistive braking and regenerative braking act, while at lower speeds where regenerative braking does not work, air braking is used. Traditional trains use the combination of resistance braking and air braking, which has two disadvantages: ① part of the braking energy cannot be absorbed by ad...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the existing electric locomotive braking system and provide an electric locomotive braking system based on a high-power inverter to solve the problem of low energy utilization rate when only regenerative energy is fed back to the traction network when the inverter feedback system is used. , Raise the grid voltage, which is unfavorable to the power supply equipment of the substation, and the eddy current braking process converts the kinetic energy of the moving object into heat energy and dissipates it when only the eddy current braking system is used, causing the braking device to heat up and demagnetizing the permanent magnet, resulting in brake failure problem

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