Automatic power-passing phase-splitting method of AC drive electric locomotive

Abstract

The invention discloses an automatic passage method through phase splitting for an AC-DC-AC electric locomotive which comprises the following steps: before the electric locomotive runs into a neutral section, a traction control system controls a traction motor to work in a regenerative braking mode and controls an inverter to stabilize intermediate DC voltage; a pulse rectifier works in an inversion state; an alternating voltage equal to a traction voltage is generated on the primary side of a traction transformer, thereby making the primary side of the traction transformer obtain zero current from a power supply arm; after the electric locomotive runs into the neutral section, the intermediate DC voltage still maintains stability; the AC phase generated by the inversion of the pulse rectifier in the inversion mode changes gradually so as to make the voltage of the primary side of the traction transformer change to become equal to the traction voltage of a next power supply arm; and then the electric locomotive enters the next power supply arm and runs normally. The method enables the automatic passage through phase splitting; in addition during the phase splitting, a main circuitbreaker does not need to be turned on and off without arc discharge, interception overvoltage and closing surge overcurrent, and an auxiliary system is not deenergized; and the passage through phase splitting has short time, low traction loss and small speed drop.

Description

A Method for Automatic Over-power Phase Separation of AC-DC-AC Electric Locomotive technical field The invention relates to an automatic over-power phase separation method for an AC-DC-AC electric locomotive. Background technique There are many methods for locomotive over-electricity and phase separation. In the early days, trains were slow, and manual over-electricity and phase separation were usually used. A phase-separation sign was set in the phase-separation area to instruct the driver to operate over-power and phase separation. Before reaching the neutral section, the driver first reduces the traction level to 0, disconnects the auxiliary system, and then disconnects the main circuit breaker on the primary side of the traction transformer, so that the locomotive passes through the neutral section without electricity. After the locomotive enters the power supply area of ​​the power supply arm of the next phase, the driver closes the main breaker, starts the auxiliary ...

AI Technical Summary

Problems solved by technology

Due to many operating processes, it takes time for the main circuit breaker to break and the auxiliary system to be shut down and restarted. Therefore, the phase separation section (power failure) takes a long time, which causes a large traction loss of the locomotive. In difficult areas, it may cause the train to stop. , can not pass the phase separation area, and at the same time, the main circuit breaker is frequently opened and closed, which affects the life of the main breaker, and the transformer still has a surge current when it is closed

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