Detection method and detection device for locomotive synchronizing signal phase, power supply system and electric locomotive

Abstract

The invention relates to a detection method and a detection device for a locomotive synchronizing signal phase, a power supply system and an electric locomotive. The detection method for the locomotive synchronizing signal phase comprises collecting current value on an input side of a converter in a locomotive power supply system, generating a phase conversion signal when the acquired current value is judged to be larger than a preset threshold value, and increasing or reducing preset degrees of the phase of a received synchronizing signal according to the phase conversion signal to transmit the synchronizing signal to a control unit of the power supply system. According to the detection method for the locomotive synchronizing signal phases, the purpose of synchronizing signal phase conversion can be achieved without the need for modifying hardware circuit connection in the power supply system, and thus the complex procedures of hardware circuit modification are avoided.

Description

technical field [0001] The invention relates to electrical control technology, in particular to a method for detecting the phase of a synchronous signal of a locomotive, a detection device, a locomotive power supply system and an electric locomotive. Background technique [0002] In the electrified railway, the catenary is the power supply grid of the electrified railway, and the power supply system of the electric locomotive obtains electric energy from the grid. [0003] Figure 4 The structural schematic diagram of the electric locomotive power supply system provided for the prior art, such as Figure 4 As shown, the power supply system mainly includes a traction transformer 10, a reactor 11 and a converter 12 connected in series in sequence, and a voltage transformer 13 is arranged between the grid 16 and the input end of the traction transformer 10, and the voltage transformer 13 A synchronous transformer 14 and a control unit 15 are serially connected to the output end...

AI Technical Summary

Problems solved by technology

[0007] If the obtained synchronous signal is opposite to the phase of the grid voltage waveform, after the control unit generates a control signal to the converter according to the synchronous signal, the voltage at the input side of the converter will be in phase opposite to the grid voltage. The voltage fluctuation on the input side of the converter causes damage to the components in the converter and also affects the normal operation of each device in the entire power supply system

[0008] In order to avoid the occurrence of the above phenomenon, the current method is to collect the high-voltage signal from the grid voltage and the synchronous signal on the output side of the synchronous transformer to compare the phase of the synchronous signal with the phase of the grid voltage waveform. When the synchronous signal is found When the phase of the voltage transformer is opposite to the phase of the grid voltage, modify the wiring between the voltage transformer and the synchronous voltage device so that the phase of the synchronization signal is the same as the phase of the grid voltage, and the power supply system in the locomotive usually uses pre-wiring, so modify the hardware circuit wiring more complicated work

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