Novel method and device for phase separation control of ground surface over-current

Abstract

The invention discloses a novel method and a novel device for phase separation control of ground surface over-current. The method comprises the followings steps of: determining A and B phase voltage phases of a contact line according to locomotive position sensors CG1, CG2, CG3 and CG4 arranged on a rail and contact line voltage phase detection modules M1 and M2 used for detecting the voltage phases of the contact line; and using a controller to control the connection and the disconnection of switching devices K1 and K2 consisting of full-control type power electronic devices so as to realize ground surface bumpless transfer over-current phase separation of an electric locomotive. The method and the device realize the bumpless transfer of the electric locomotive (a motor train unit) during the ground surface over-current phase separation so as to avoid the generation of a cut-off current over-voltage and a switch-on surge over-current, and reduce requirements on the switching devices. The method and the device have a high switching speed and can short the power-cut time for a train to pass through a phase separation area.

Description

Technical field [0001] The invention relates to the field of manufacturing AC / DC / AC electric locomotives (EMUs) and ground overcurrent phase separation devices for AC / DC electric locomotives. Background technique [0002] There are many methods for electric locomotive (EMU) over-voltage phase separation. In the early days, the speed of trains was relatively slow, and manual over-power phase separation was usually used. There was a phase-separation sign in the phase-separation area to instruct the driver to operate over-power 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 aux...

AI Technical Summary

Problems solved by technology

It can be seen that the improved solution still cannot completely solve the shortcomings of the traditional ground over-current phase-splitting device, and the complexity and cost of the system are increased due to the need to use step-down transformers

[0006] In summary, the existing ground over-current phase separation device has the following problems: 1) Since it is a full-load breaking switch in the whole process, the requirements for the switch are relatively high; 2) When the neutral section voltage is converted, it is a If the split-phase switch is disconnected, a cut-off overvoltage will be generated; 3) When the voltage is switched in the neutral section, the voltage phase before and after the switch is inconsistent, and there will be a difference in the steady-state magnetic flux of the traction transformer on the locomotive. Saturation causes closing surge overcurrent

For locomotives that rotate the motor and draw power from the traction transformer, it will also cause overcurrent in the auxiliary system when the switch is closed

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