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Rapid charging pile harmonic wave detection device

A technology of harmonic detection and current detection module, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of difficult to guarantee real-time performance and high cost, and achieve easy control of quality factor, low output impedance and simple circuit structure. Effect

Inactive Publication Date: 2017-05-31
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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AI Technical Summary

Problems solved by technology

[0004] Harmonic detection of analog band-pass or band-stop filters is an early analog harmonic measurement. Other harmonic detection has its own outstanding advantages. Their common feature is that real-time calculation and analysis are required, the cost is high, and real-time performance is difficult to be guaranteed.

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  • Rapid charging pile harmonic wave detection device

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Embodiment Construction

[0026] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0027] like figure 1 As shown, a fast charging pile harmonic detection device includes: a current detection module 1, which is used to detect the current signal in the line; a filter bank 2, whose input terminal is connected to the output terminal of the current detection module, and is used to detect the current The harmonics and fundamental waves of the signal; the comparator 3, whose input terminal is connected to the output end of the filter bank, is used to judge the size between each harmonic wave and the fundamental wave and output the corresponding driving signal; the indicating module 4, According to the corresponding driving signal, it is used to indicate the corresponding harmonic order exceeding the standard.

[0028] The above-mentioned current detection module 1 is an air-core coil.

[0029] Above...

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Abstract

The invention discloses a rapid charging pile harmonic wave detection device. The device comprises a current detection module, a filter group, a comparer and an indication module. The current detection module is used for detecting current signals in the circuit. The input end of the filter group is connected with the output end of the current detection module and the filter group is used for detecting each harmonic wave and each base wave of each current signal. The input end of the comparer is connected with the output end of the filter group. The comparer is used for judging the size between each harmonic wave and the corresponding base wave and outputting corresponding driving signals. The indication module is used for indicating corresponding frequency of harmonic waves exceeding the standard according to corresponding driving signals. The wave detection device is simple, practical and low in manufacturing cost.

Description

technical field [0001] The invention relates to the field of harmonic detection of fast charging piles for electric vehicles, in particular to a harmonic detection device for fast charging piles. Background technique [0002] At present, China has begun to promote fast charging piles on a large scale, and has built a large number of fast charging stations. Fast charging piles are a kind of high-power power electronic devices, which will bring a lot of harmonics to the power grid when they are used. Theoretical analysis and actual tests show that the harmonic order generated by the fast charging pile is mainly m=6k±1 (k=1,2,3...,n), that is, it mainly produces 5, 7, 11, 13, 17, 19 times, etc. harmonic. And the harmonic amplitude is inversely proportional to the harmonic order, that is, the higher the harmonic order, the lower the harmonic content. [0003] The main methods of harmonic detection in power system are: harmonic detection based on analog band-pass or band-stop f...

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Application Information

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IPC IPC(8): G01R23/165
CPCG01R23/165
Inventor 潘玲田英杰潘爱强陈甜甜张鹏宋杰孙文任丽佳王云
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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