Method for judging direct current arc fault based on real-time measured multi-band frequency component rate

A real-time measurement and frequency component technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as inapplicability, fault arc waveform distortion, etc.

Inactive Publication Date: 2013-01-02
常州加伏沃新能源科技有限公司
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Problems solved by technology

This method is still feasible in the AC low-voltage system, but in the photovoltaic DC system, because the characteristics of photovoltaic power generation are unpredictable with time and the environment; the interference waveforms of various inverters are also different and vary with the load; There are varying numbers of intervals

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  • Method for judging direct current arc fault based on real-time measured multi-band frequency component rate

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Embodiment Construction

[0020] Attached below figure 1 , the method of the present invention is described in detail.

[0021] figure 1 Step 1 describes the DC component U of the voltage obtained through the digital filter DC and the DC component of the current I DC and the voltage U of the high frequency component HY with current I HY .

[0022] figure 1 The real-time calculation of the DC component power S described in step 2 DC =U DC *I DC and other spectrum power S HY =U HY *I HY .

[0023] figure 1 The real-time calculation of the arc power ratio coefficient K described in step 3 arc = S HY / S DC , when K arc Less than the preset value K Normal , it is judged that the photovoltaic system is in a normal state at this time, and return to step 1); if K arc Greater than the preset value K Normal , it is judged that the photovoltaic system is in the state of arc fault detection at this time, turn to step 4), and save the current SDC for S DCNormal .

[0024] figure 1 When the ph...

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Abstract

The invention relates to a method for judging a direct current arc fault based on a real-time measured multi-band frequency component rate. Along with the large-scale application of photovoltaic generation, and particularly the wide application of a photovoltaic solar panel to the roof and the external wall of a building, fires caused by a photovoltaic generation system happen in many places. Through analysis, people find that the fires are basically caused by the direct current arc fault of the photovoltaic generation system, and therefore, detecting and isolating the direct current arc fault for causing equipment damage and fire hidden danger become problems needed to be solved, however, due to the specificity of the direct current arc fault of the photovoltaic generation system, the conventional fault waveform based arc fault detection principle is not suitable for the direct current arc fault of the photovoltaic generation system. The method has the core thought that the overlarge energy is contained in the arc to cause the fire damage caused on the basis of the fault arc, and by using a method for detecting the energy source ratio of the frequency spectrum component energy of multiple bands in a voltage and current waveform to the total spectrum, the direct current arc faults possibly causing fires can be rapidly and reliably detected without being affected by other noises in the system, and the safety of the photovoltaic generation system is ensured.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic electrical fault detection. More precisely, the invention relates to a method for judging whether a DC arc fault occurs in a photovoltaic system based on real-time measurement of frequency component proportions of multiple frequency bands in voltage and current. Background technique [0002] Arc fault protection is not a new thing. Studies have found that the fault arc caused by a small current has enough energy to trigger ignition and cause a fire when no overcurrent occurs. Since the 1990s, in North America, Equipping arc fault protectors in AC systems has become a mandatory standard for safety. With the large-scale application of photovoltaic power generation, especially the widespread application of photovoltaic panels on building roofs and exterior walls, fires caused by photovoltaic power generation systems have occurred in many places. Through analysis, it is found that this type of f...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 邵俊松
Owner 常州加伏沃新能源科技有限公司
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