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A Software Online Diagnosis Method for Network Voltage Synchronization Signal Reversed

A technology of synchronization signal and diagnosis method, applied in the direction of electrical connection testing, etc., can solve the problems of inability to make direct judgment, low work efficiency, slow processing speed, etc., to achieve the effect of improving fault handling efficiency, improving effectiveness, and easy engineering implementation.

Active Publication Date: 2020-08-04
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of manually judging the reverse connection of the network voltage synchronization signal can only be reported through the four-quadrant control pulse and then analyzed through the corresponding data. It cannot be directly judged, and the work efficiency is low and the processing speed is slow.

Method used

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  • A Software Online Diagnosis Method for Network Voltage Synchronization Signal Reversed
  • A Software Online Diagnosis Method for Network Voltage Synchronization Signal Reversed
  • A Software Online Diagnosis Method for Network Voltage Synchronization Signal Reversed

Examples

Experimental program
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Effect test

Embodiment 1

[0052] like figure 1 Shown is a typical AC drive system main circuit. The pantograph transmits the 25kV single-phase power frequency AC power of the power supply network to the traction transformer, and the four-quadrant pulse rectifier converts the single-phase AC power stepped down by the transformer into DC power, which is output to the traction inverter through the intermediate DC link. When the traction converter is turned on, the charging contactor KM1 is closed, and the alternating current charges the intermediate supporting capacitor through the secondary traction winding and the charging resistor.

[0053] When the synchronous signal is normal, the phase of the secondary voltage of the traction winding is approximately the same as the phase of the input current of the secondary winding; when the synchronous signal is reversed, the phase of the secondary voltage of the traction winding is approximately opposite to the phase of the input current of the secondary winding...

Embodiment 2

[0075] like figure 2 As shown, the difference between the main circuit of the AC drive system of Embodiment 2 and Embodiment 1 is that it includes at least two traction converter circuits.

[0076] image 3 It is a schematic diagram of the voltage and current waveforms during the charging process when the synchronization signal is normal. like Figure 4 Shown is a schematic diagram of the voltage and current waveforms of the charging process when the synchronous signal is reversed. In the figure, Ud1 is the measured value of the intermediate voltage sensor VH1 in the main circuit, and U2 is figure 1 The network voltage synchronization signal collected by the medium and high voltage voltage transformer is converted to the voltage measurement value of the traction secondary winding, and Iqc1 and Iqc2 are the measurement values ​​of the secondary winding input current sensors LH1 and LH2 respectively.

[0077] Analyzing and comparing the voltage and current waveforms of the ...

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Abstract

The invention discloses the software online diagnosis method of network-voltage synchronous-signal reverse connection. The method comprises the following steps of S1, collecting the secondary voltagevalue of a traction winding and the input current value of a secondary winding in real time; S2, carrying out phase comparison on the secondary voltage of the traction winding and the input current ofthe secondary winding in the step S1; and S3, according to a phase comparison result, determining whether a network-voltage synchronous signal is connected reversely. In the invention, the reverse connection problem of the network-voltage synchronous signal can be diagnosed in an online mode, and the validity and the fault processing efficiency of fault diagnosis can be increased; and a waveformphase difference calculating method is adopted so that the whole diagnosis method is simple and practical and engineering realization is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis, and more specifically relates to a software online diagnosis method for network voltage synchronization signal reverse connection. Background technique [0002] The main circuit of a typical AC drive system such as figure 1 shown. The pantograph transmits the 25kV single-phase power frequency AC power of the power supply network to the traction transformer, and the four-quadrant pulse rectifier converts the single-phase AC power stepped down by the transformer into DC power, which is output to the traction inverter through the intermediate DC link. In order to realize the effective control of the intermediate DC voltage, the TCU collects the relevant signals of the intermediate voltage sensor VH1, the high-voltage voltage transformer TA, and the four-quadrant input current sensors LH1 and LH2, and controls the pulse of the four-quadrant module components to realize the closed-loop contro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/66
CPCG01R31/66
Inventor 李学明刘良杰徐绍龙成正林廖亮谭永光彭辉袁靖黄明明蒋奉兵
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD