CN102914709B - Method for distinguishing inverter noise signal from direct-current arc signal based on signal echo device - Google Patents
Method for distinguishing inverter noise signal from direct-current arc signal based on signal echo device Download PDFInfo
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- CN102914709B CN102914709B CN201210379390.9A CN201210379390A CN102914709B CN 102914709 B CN102914709 B CN 102914709B CN 201210379390 A CN201210379390 A CN 201210379390A CN 102914709 B CN102914709 B CN 102914709B
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Abstract
The invention relates to a method for distinguishing an inverter noise signal from a direct-current arc signal based on a signal echo device. Generally, for reliably detecting direct-current arc faults in a photovoltaic power generation system, which possibly cause the fire, a direct-current arc fault detector is required to reliably distinguish a noise signal from a direct-current arc fault signal on a circuit. According to the famous pink principle that a voltage frequency spectrum is in inverse relation to a current frequency spectrum when arc faults occur, the noise signal can be distinguished form the arc fault signal; when the intensity of the noise signal is excessively high to submerge the direct-current arc fault signal, the method provided by the invention is required, i.e., the signal echo device mounted between a photovoltaic panel and the direct-current arc fault detector is used, so that the noise signal of the inverter forms noise echo at the signal echo device; and an excessively-high noise signal is filtered from the noise echo and the noise signal through a differentiator in the direct-current arc fault detector and only an effective signal is retained for detecting the direct-current arc faults by the detector.
Description
Technical field
The invention belongs to the electric fault detection technique field of photovoltaic, the present invention relates to a kind of employing more precisely and signal echosonde is installed, the inverter noise signal in differentiation photovoltaic system and the method for direct-current arc signal.
Background technology
Along with the large-scale application of photovoltaic generation, particularly photovoltaic battery panel are in the widespread use of building roof and exterior wall, how many places there occurs the fire because photovoltaic generating system causes.Find by analyzing, this kind of fire is caused by the direct current arc fault of photovoltaic generating system substantially, and therefore detecting and isolating the direct current arc fault causing device damage and disaster hidden-trouble just becomes the problem that must solve.This wherein reliably detects that direct current arc fault has become raising security of system, prevents a top priority of disaster hidden-trouble.In arc signal frequency spectrum, have " pink principle " that one important, namely during arc fault inversely, and when normal noise, then there is not this relation in voltage and current frequency spectrum.
In photovoltaic system, direct current arc fault signal also meets this principle completely.But, owing to detecting, direct current arc fault equipment installation site is different, photovoltaic apparatus model is different, arc fault position is not equal, under may causing partial picture, this characteristic of arc fault is overshadowed in normal noise signal, can not well be detected.Analyze noise source, find that it is mainly derived from the inverter section in photovoltaic system, reason produces due to the frequent adjustment of the power electronic devices that maximal power tracing function or other factors cause.
The present invention passes through by the placement of direct-current arc detecting device and between photovoltaic panel and inverter, and is provided with Dynamic Signal echosonde at direct-current arc detecting device near photovoltaic panel side, echo inverter noise.After current transformer produces noise, will by direct-current arc detecting device, noise echo is formed at Dynamic Signal echosonde place, and again by direct-current arc detecting device, just this part noise signal can be removed by the method for difference, what retain is exactly effective electric signal, and detects whether there occurs direct current arc fault by the electric arc " pink principle " of direct-current arc detecting device.
Summary of the invention
The present invention seeks to: the artificial echo manufacturing current transformer noise signal, and with noise signal successively by same pick-up unit, use the method for difference, confirm filtering current transformer noise signal, retain effective electric signal for detecting direct current arc fault, to guarantee the safe operation of photovoltaic system, the fire preventing fault electric arc from causing occurs.
Main noise source in photovoltaic system is the power electronic devices in inverter, by the echo of inverter noise signal and the difference of noise signal itself, filtering inverter noise signal can be confirmed, and retain effective electric signal for detecting direct current arc fault.Therefore the present invention is by the installation site of noise echosonde, the installation site of direct current arc fault detecting device, and signal differential method, and reliable filtering inverter noise signal, remains effective signal to be detected.
The present invention adopts following technical scheme to realize, and comprises the steps:
1) direct current arc fault detecting device is installed between photovoltaic panel and photovoltaic DC-to-AC converter;
2) signal echosonde is installed between direct current arc fault detecting device and photovoltaic panel;
3) by the signal echosonde reflection inverter noise signal that may send by direct current arc fault detecting device;
4) in direct current arc fault detecting device, utilize differential principle, the noise signal of priority different directions by this detecting device can be filtered, only retain the signal effective to be detected of photovoltaic panel side.
In the present invention, disclose a kind of method realizing distinguishing in photovoltaic system inverter noise and direct current arc fault signal, the method is based on differential principle, by noise signal echosonde, people produces the signal identical with inverter noise and filters out this noise signal by the method for difference, and only retains the useful signal that sends of photovoltaic panel side.Wherein signal echosonde in above-mentioned steps, and the algorithm of differential principle is ripe engineer applied algorithm, does not describe at this.
3, beneficial effect
The method breaches traditional, utilize signal filtering technology, find noisy signal characteristic and the thinking of filtering inverter noise, from the angle of signal echosonde, cleverly the noise signal of outside is utilized differential principle, reliable filtering, only remain useful signal for direct-current arc detecting device, avoid noise signal interference, prevent malfunction or the tripping of direct-current arc detecting device.The method principle is simple, and algorithm is reliable, avoids all uncertain factors directly detecting direct current arc fault signal from the voltage current waveform mixing noise signal.
Accompanying drawing explanation
It is the schematic diagram of the inventive method in figure.
Embodiment
Below in conjunction with accompanying drawing, the inventive method is described in detail.
In figure, 1 is direct current arc fault detecting device, 2 is signal echosonde, 3 is photovoltaic battery panel, 4 is photovoltaic DC-to-AC converter, 5 noise signals sent for photovoltaic DC-to-AC converter, 6 signals to be detected produced for photovoltaic battery panel side, 7 is the noise signal returned through signal echosonde, 8 is the difference engine in direct current arc fault detecting device 1, and 9 is the arc fault determining device in direct current arc fault detecting device 1, and 10 is DC energy passage.In figure, DC Line Fault detecting device 1 is installed between photovoltaic battery panel 3 and photovoltaic DC-to-AC converter 4, and signal echosonde 2 is installed between DC Line Fault detecting device 1 and photovoltaic battery panel 3, carried out the DC energy flowing in signal echosonde 7 and direct current arc fault detecting device 1 by DC energy path 10.The issuable noise signal 5 of photovoltaic DC-to-AC converter 4 is by direct current arc fault detecting device 1 and by entering signal echosonde 2 after its record, noise signal 5 is returned as noise echo 7 and with signal 6 to be detected by signal echosonde, together send into direct current arc fault detecting device 1, one end of difference engine 8 in direct current arc fault detecting device 1 will by noise signal 5, the other end will pass through mixed signal, i.e. noise echo 7 and arcing fault signal 6, then the output terminal of difference engine will only be signal 6 to be detected, the arc fault determining device 9 that signal 6 to be detected is sent in direct current arc fault detecting device 1 is judged whether system there occurs arc fault.
Claims (1)
1. utilize signal echosonde to produce the method for inverter noise echo filter out noise, it is characterized in that comprising the following steps:
1) direct current arc fault detecting device (1) is installed between photovoltaic panel (3) and photovoltaic DC-to-AC converter (4);
2) installing signal echosonde (2) is positioned between direct current arc fault detecting device (1) and photovoltaic panel (3);
3) noise signal (5) that inverter sends is reflected by signal echosonde (2), form noise echo (7) and same arcing fault signal (6) sends into difference engine (8) one end in direct current arc fault detecting device (1), the noise signal (5) that inverter sends sends into the other end in the difference engine (8) in direct current arc fault detecting device (1);
4) in direct current arc fault detecting device (1), utilize differential principle, the noise signal (5) of difference engine (8) and noise echo (7) are filtered, only retains the arc fault determining device (9) in the signal effective to be detected (6) feeding direct current arc fault detecting device (1) of photovoltaic panel side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210379390.9A CN102914709B (en) | 2012-10-09 | 2012-10-09 | Method for distinguishing inverter noise signal from direct-current arc signal based on signal echo device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210379390.9A CN102914709B (en) | 2012-10-09 | 2012-10-09 | Method for distinguishing inverter noise signal from direct-current arc signal based on signal echo device |
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| Publication Number | Publication Date |
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| CN102914709A CN102914709A (en) | 2013-02-06 |
| CN102914709B true CN102914709B (en) | 2015-01-07 |
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| CN201210379390.9A Expired - Fee Related CN102914709B (en) | 2012-10-09 | 2012-10-09 | Method for distinguishing inverter noise signal from direct-current arc signal based on signal echo device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104811135B (en) * | 2015-04-16 | 2017-04-26 | 西安交通大学 | Photovoltaic system fault arc detection method under common-mode signal interference condition |
| US10158324B2 (en) | 2015-07-23 | 2018-12-18 | Analog Devices Global Unlimited Company | Computationally efficient arc detector with coherent sampling |
| CN105093082A (en) | 2015-08-31 | 2015-11-25 | 上海正泰电源系统有限公司 | DC fault arc detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4206668B2 (en) * | 2002-01-08 | 2009-01-14 | ダイキン工業株式会社 | Noise filter, outdoor unit and air conditioner |
| AT509251A1 (en) * | 2009-08-14 | 2011-07-15 | Fronius Int Gmbh | 4 EXPERTS IN THE FIELD OF ARC FLASH IN PHOTOVOLTAIC PLANTS AND ONE SUCH PHOTOVOLTAIC PLANT |
| US8218274B2 (en) * | 2009-12-15 | 2012-07-10 | Eaton Corporation | Direct current arc fault circuit interrupter, direct current arc fault detector, noise blanking circuit for a direct current arc fault circuit interrupter, and method of detecting arc faults |
| DE102011008140A1 (en) * | 2010-08-31 | 2012-03-01 | Ellenberger & Poensgen Gmbh | Method and device for switching a DC voltage system |
| EP2671256B1 (en) * | 2011-02-02 | 2019-03-13 | SMA Solar Technology AG | Protective device for a photovoltaic system |
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Granted publication date: 20150107 Termination date: 20171009 |