Direct power control method of combined power supply device

Abstract

The invention discloses a direct power control method of a combined power supply device. The method aims at the combined power supply device which uses a transformer T1, a transformer T2 and a converter CON to supply power to a neutral section, the axis-d component and the axis-q component of the winding voltage u12 of the transformer T1, voltage drop of a secondary winding of the transformer T2 and voltage drop of a primary winding of the transformer T2 are processed correspondingly, an axis-d voltage component and an axis-q voltage component needed by the converter CON is obtained via directpower control, modulation is then carried out to obtain a needed converter output voltage, and thus, the output voltage of the whole power supply device is adjusted, and the output power of the combined power supply device is controlled. According to the invention, the output power of the combined power supply device can be adjusted in a controllable way.

Description

technical field [0001] The invention relates to the fields of AC-DC-AC electric locomotives (EMUs), ground over-current phase separation devices for AC-DC electric locomotives, combined power supply devices for virtual in-phase power supply, etc., in particular to a direct power control method for combined power supply devices. 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 t...

AI Technical Summary

Problems solved by technology

When the ground is over-voltage and phase-separated, the electric locomotive (EMU) performs voltage conversion in the neutral section. It is a load-disconnecting phase-splitting switch, which will produce a cut-off overvoltage, which has high requirements for the switch; at the same time, it is full-load and closes another phase-splitting switch. Switch, there is a traction transformer on the locomotive, because the two phases are different, the steady-state magnetic flux of the transformer has a phase difference, and the closing surge overcurrent will be caused by dynamic magnetic flux saturation when closing

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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