A current conversion device for an automatic phase separation system on the ground of an electrified railway

Abstract

The invention provides a converter device of an electric railway ground auto-passing neutral section system. The device comprises a rectifier side single-phase multi-winding rectifier transformer T1,an inverter single-phase multi-winding inverter transformer T2 and a back-to-back four-quadrant converter; the device is used for conducting AC-DC-AC transformation on accessed alpha-phase and beta-phase traction busbar power supply, and supplying electricity to a catenary electricity sub-phase neutral section; a high-voltage winding is arranged on the T1 primary side, and n low-voltage windings and one high-voltage winding are arranged on the secondary side; n low-voltage windings are arranged on the T2 primary side, and one high-voltage winding is arranged on the secondary side; the secondary side high-voltage winding is connected with the secondary side high-voltage winding in series to be combined into voltage to supply electricity to the neutral section. Accordingly, the advanced power electronic converter device and a special transformer serve as core components, continuous power supply of the catenary electricity sub-phase neutral section can be achieved, a train can avoid powerfailure for the passing neutral section, no electric arc or overvoltage can be generated.

Description

technical field [0001] The invention relates to the technical field of railway power supply, in particular to a current conversion device for an automatic phase separation system on the ground of an electrified railway. Background technique [0002] my country's electrified railway traction network adopts phase-separated and segmented single-phase power frequency AC power supply, and there are about 200-900m of electric split-phase with neutral section every 30-60km. Under the condition of three-phase transformer power supply, the partition is located The design phases of the catenary on both sides of the split phase are the same, but they are powered by feeders from different substations, so the phase difference is small; in addition, different voltage isolation is set between the catenary systems fed by different feeders from the bus of the same substation. Electrically segmented joints that function as electrical split phases, these are called virtual electrical split phase...

AI Technical Summary

Problems solved by technology

[0005] Over-phase splitting equipment based on automatic switching of ground mechanical switches has a small amount of application in my country, but the actual application also shows the following defects: 1) Mechanical switch switching cannot accurately control the phase, and there are overvoltage and overcurrent impacts; 2) Mechanical switches The switching time is long, and there is a long non-electric dead zone in the neutral section during the commutation process; 3) There is a high overvoltage and overcurrent impact, and the control software and protection setting value of the train need to be modified; 4) The life of the mechanical switch is low , requires regular maintenance and replacement, high operating costs in the later period

[0006] In view of some defects in the automatic switching over-phase separation technology of ground mechanical switches, in recent years, relevant institutions have also carried out research on automatic switching over-phase separation technology based on ground electronic switches. This technology is characterized by the use of electronic switches instead of mechanical switches. The basic principle of over-phase separation has not changed, so there must still be an electric dead zone in the neutral section during the commutation process, which will still bring problems such as overvoltage and overcurrent shocks to the train

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