Ground automatic phase splitting circuit and its control method, control device and control system

Abstract

The invention provides a ground automatic phase separation circuit and its control method, control device and control system. The high-voltage winding of the first transformer of the ground automatic phase splitting circuit is connected to the first power supply arm; the first end of the AC / DC converter is connected to the low-voltage winding of the first transformer; the current sensors are respectively connected to the first end of the AC / DC converter It is connected with the low-voltage winding of the first transformer; the second end of the DC / AC converter is connected with the second end of the AC / DC converter; both ends of the voltage sensor are connected with the second end of the DC / AC converter and the AC / DC converter connected to the second terminal of the transformer; the low-voltage winding of the second transformer is connected to the first terminal of the DC / AC converter, and the high-voltage winding of the second transformer is connected to the power supply arm in the neutral zone; both the AC / DC converter and the DC / AC converter are It is an H-bridge including 4 switching devices, which can make the train pass through the phase-splitting area quickly and smoothly.

Description

technical field [0001] The present invention relates to the field of automatic phase separation, in particular to a ground automatic phase separation circuit and its control method, control device and control system. Background technique [0002] The primary side of my country's electrified railway traction substation is generally three-phase 110kV or 220kV. In order to balance the load power of three-phase voltage, my country's electrified railway catenary adopts single-phase 25kV segmental commutation power supply, and adjacent different voltage phases There is a phase separation area without power between the power supply sections. [0003] Before the train enters the phase separation area, a series of on-board actions are required according to the signal of the position sensor buried on the ground: reduce the traction power to 0, block the four-quadrant converter, cut off the vacuum circuit breaker on the train, and the traction inverter Switch to the micro-voltage syste...

AI Technical Summary

Problems solved by technology

In addition, due to the inconsistency of the phases of the front and rear power supply arms, most of the automatic over-phase devices on the ground will cause over-current or over-voltage shocks in the traction system of the train.

Therefore, most of the above-mentioned devices have high cost and low reliability, and basically do not have the feasibility of application in the railway field, and cannot ensure that the train passes through the phase separation zone quickly and smoothly.

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