Phase selection control system and control method suitable for passing neutral section of electric locomotive

Abstract

The invention discloses a phase selection control system and a control method suitable for passing neutral section of electric locomotive. The phase selection control system comprises an A-phase voltage and current acquisition module, a B-phase voltage and current acquisition module, a position signal induction module, a ground console, a main control module and a GTO bidirectional switch module, wherein according to the phase selection control method, the phase selection control system is used; when an electric locomotive passes through a neutral section, the electric locomotive enters a B-phase power supply arm from an A-phase power supply arm and sequentially passes through a first ground position sensor and a second ground position sensor; when the electric locomotive passes through the first ground position sensor, the phase selection control system carries out switching-off operation; and when the electric locomotive passes through the second ground position sensor, the phase selection control system performs switching-on operation. According to the invention, overvoltage and overcurrent generated when the electric locomotive passes through the neutral section can be reduced and even eliminated, and electrical equipment damage, insulation breakdown and misoperation of a relay protection device in the electric locomotive are avoided.

Description

technical field [0001] The invention belongs to the field of electrified rail transit, and in particular relates to a phase selection control system and a control method suitable for electric locomotive over-phase separation. Background technique [0002] In my country, 27.5KV single-phase power frequency alternating current is widely used in electrified railway power supply. Since the electric locomotive is a single-phase load, it will have a negative impact on the three-phase balance of the power system. In order to alleviate this problem, the electrified railway adopts the method of segmental current taking and commutation connection. The transition region at the junction of different phases is called the electroseparation phase region. [0003] In the process of automatic phase separation of the electric locomotive, the electric locomotive realizes the two-phase electric switching by closing the switch, so as to pass through the electric phase separation area smoothly. ...

AI Technical Summary

Problems solved by technology

However, due to the withstand voltage problem of power electronic switches, its application in electrified railways is limited.

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