Method and system for detecting harmonic current signal strength of traction converter

A traction converter and signal strength technology, which is used in the detection of the harmonic current signal strength of traction converters, and the detection system field of the harmonic current signal strength of traction converters, can solve the problem that neural networks can only be trained offline and localized. Minimization, poor generalization ability and other problems, to achieve the effect of high calculation accuracy, fast processing speed, low noise and environmental impact

Inactive Publication Date: 2018-03-06
NINGBO CRRC TIMES TRANSDUCER TECH CO LTD
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Problems solved by technology

However, the neural network is based on large sample learning, which is greatly affected by samples, which sometimes leads to unsuccessful training.
And affected by the ...

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  • Method and system for detecting harmonic current signal strength of traction converter

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] Such as figure 1 As shown, the detection system of the detection method for the harmonic current signal strength of the traction converter in this embodiment includes a current sensor 1 , a harmonic current detection device 2 , and a safety relay 3 .

[0029] The harmonic current detection device 2 includes a signal amplification and filtering circuit 21 , an analog-to-digital conversion circuit 22 , and a digital signal processing circuit 23 .

[0030] The input end of the signal amplification filter circuit 21 is connected to the output end of the current sensor 1 , and the input end of the analog-to-digital conversion circuit 22 is connected to the output end of the signal amplification filter circuit 21 . The current sensor 1 is used to collect the output current of the traction converter on the busbar, and the current sensor 1 col...

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Abstract

The invention relates to a method for detecting the harmonic current signal strength of a traction converter. The method comprises the steps of acquiring an output current signal of a traction converter; amplifying and filtering the output current signal; performing analog-digital conversion on the output signal to obtain a digital signal; setting the center frequency, passband and cutoff frequency of a digital band-pass filter, and processing the digital signal using digital band-pass filter; and obtaining the RMS of the output signal of the digital band-pass filter by using a sliding windowcalculator, and then obtaining a signal strength value of the traction converter. The method for detecting the harmonic current signal intensity of the traction converter in the invention performs pure time domain signal processing on the signal, and the processing process is simpler. The characteristics of the digital band-pass filter in the filtering process are basically not affected by environmental factors. In addition, the sliding window calculator is used to process the data, the change of the input signal can be tracked in real time, and the defect of failing to respond well to an abrupt signal can be solved.

Description

technical field [0001] The invention relates to the technical field of track circuits, in particular to a method for detecting the strength of the harmonic current signal of a traction converter, and also to a detection system for the strength of the harmonic current signal of the traction converter. Background technique [0002] Traction converters are widely used in rail vehicles. The function of traction converters is to convert the electric energy between DC and AC systems, and to control and regulate various traction motors, so as to control the operation of vehicles. The detection of the harmonic current signal strength of the converter directly affects the normal operation of the vehicle. In the prior art, time-frequency domain signal processing technology is often used to detect the signal strength of the traction converter harmonic current. The main detection methods include detection methods based on analog band-pass or band-stop filters, detection methods based on...

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Application Information

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IPC IPC(8): G01R19/165G01R23/167
CPCG01R19/16571G01R23/167
Inventor 周峰郑良广杨玉钊赵爽包演生郭俊杰陈秋伟
Owner NINGBO CRRC TIMES TRANSDUCER TECH CO LTD
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