Electric energy regulation device and method for electrified railways

Abstract

The invention discloses an electric energy regulation device and method for electrified railways. The electric energy regulation device is in bridging connection between two power supply arms of a traction transformer. The electric energy regulation device comprises isolation transformers, single-phase back-to-back PWM converters, an energy conversion circuit, an energy storage element and a control unit. The control unit carries out calculation according to voltages, currents and directions of the power supply arms alpha and beta and completes control over the PWM converters and the energy conversion circuit. Consequently, energy conversion between the power supply arms alpha and beta and the energy conversion between the energy storage element and the power supply arm alpha or the power supply arm beta can be achieved. The electric energy regulation device is capable of fully recycling and utilizing braking feedback electric energy of a locomotive through transfer, storage and release of the electric energy, improves the energy utilization rate of a tractive power supply system, reduces the installation billing capacity of a traction transformer, can deal with the negative sequence, idle work and harmonic waves of a traction substation, avoids traction force losses and speed losses, caused by electric phase separation, of a train and can also have the effects of peak load shaving and voltage stabilization and can be used as an emergency power supply.

Description

technical field [0001] The invention relates to the field of electrified railways, in particular to an electric energy regulating device and method applied in the field of electric railway traction power supply. Background technique [0002] In recent years, with the development of my country's rail transit field, especially the high-speed and heavy-duty electrified railways, the energy consumption and power supply costs of railway operations have become increasingly large. Therefore, to improve the efficiency of power transmission, reduce power consumption and power supply costs, It is of great significance to the energy saving and sustainable development of electrified railway. With regard to the energy saving and consumption reduction of electrified railways, there are still huge potentials in the following two aspects. [0003] On the one hand, the AC drive electric locomotives that have been used in large quantities in my country will feed back the regenerative braking ...

AI Technical Summary

Problems solved by technology

At the same time, the electrical phase separation link in the existing railway traction power supply system will not only cause the loss of train traction force and speed, but also cause the electrical transient process between the train network to be complicated when the train is too phase separated, which will endanger the traction network and train operation in severe cases. And the reliability of the over-phase link is low, which is one of the weakest links in the traction power supply system

Therefore, in terms of traction power supply system and its technology for electrified railways in my country, there are three prominent problems in the realization of high-speed and heavy-duty electric traction: (1) the energy consumption and economical problems of the traction power supply system; Power quality problems dominated by negative sequence, reactive power, and harmonics; (3) Train traction and speed loss problems caused by electrical phase separation

[0006] (1) In the prior art, no technical solution has been found for the application of electric energy regulating devices with similar structure to single-phase AC traction power supply network;

[0007] (2) The prior art does not involve specific technical solutions to reduce the energy consumption and cost of electrified railways by increasing the capacity utilization of traction transformers;

[0008] (3) The existing technology has a relatively single function for solving power quality problems such as negative sequence, reactive power, harmonics, and electric phase separation problems of electrified railways, and the cost performance is not high

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