Method and device for detecting electric arc in a photovoltaic installation
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorsCédric Gouy-Pailler, Nicolas Chaintreuil
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Abstract
A method for detecting an electrical arc in a photovoltaic installation includes measurement (E6) of voltage values at at least one point of the electrical circuit of the photovoltaic installation; digitization (E8) of the measured voltage values to form a sampling of data x; calculation (E10) of an estimation value y of the presence of an electrical arc based on a statistical calculation on the sampling of data and the inclusion of an omission factor Φ; and comparison (E12) of the estimation value y of the presence of an electrical arc with a threshold value to deduce therefrom the presence or absence of an electrical arc in the photovoltaic installation.
Claims24
Method for detecting an electrical arc in a photovoltaic installation, which comprises:
- measuring a plurality of voltage values at different historical times at at least one point of an electrical circuit of the photovoltaic installation;
- digitizing the measured voltage values to form a sampling of data x;
- calculating an estimation value y of the presence of an electrical arc based on a statistical calculation on the sampling of data and inclusion of an omission factor Φ whose value is applied to modify each of the plurality of voltage values measured at different historical times in the sampling of data;
- and
- comparing the estimation value y of the presence of an electrical arc with a threshold value to deduce therefrom the presence or absence of an electrical arc in the photovoltaic installation,
- wherein the calculating an estimation value y of the presence of an electrical arc comprises calculating three variables a, b, c each time a new sampling datum x is generated, by taking into account the history of the variables a, b, c.
Method for detecting an electrical arc in a photovoltaic installation, which comprises:
- measuring a plurality of voltage values at different historical times at at least one point of an electrical circuit of the photovoltaic installation;
- digitizing the measured voltage values to form a sampling of data x;
- calculating an estimation value y of the presence of an electrical arc based on a statistical calculation on the sampling of data and inclusion of an omission factor Φ whose value is applied to modify each of the plurality of voltage values measured at different historical times in the sampling of data;
- and
- comparing the estimation value y of the presence of an electrical arc with a threshold value to deduce therefrom the presence or absence of an electrical arc in the photovoltaic installation,
- wherein the omission factor depends on a sampling frequency, and
- wherein the omission factor is constant and chosen by observing the rules defined by the following table:
- Omission factor Φ contained
- Sampling frequency Fech
- within the range
- 50-300 kHz inclusive
- [0.965;
- 0.975]
- 301-750 kHz inclusive
- [0.975;
- 0.985]
- 751 kHz-8 MHz inclusive
- [0.985;
- 0.995].
Method for detecting an electrical arc in a photovoltaic installation, which comprises:
- measuring a plurality of voltage values at different historical times at at least one point of an electrical circuit of the photovoltaic installation;
- digitizing the measured voltage values to form a sampling of data x;
- calculating an estimation value y of the presence of an electrical arc based on a statistical calculation on the sampling of data and inclusion of an omission factor Φ whose value is applied to modify each of the plurality of voltage values measured at different historical times in the sampling of data;
- and
- comparing the estimation value y of the presence of an electrical arc with a threshold value to deduce therefrom the presence or absence of an electrical arc in the photovoltaic installation,
- wherein the calculation of an estimation value of the presence of an electrical arc implements the following calculations, repeated for each digitized datum x:
- first, three variables a, b and c are recalculated as follows, based on the preceding values of these variables a, b and c:
- a←Φa+x2
- b←Φb+x
- c←Φc+1
- then, the estimation value y of the presence of an electrical arc is calculated by the following formula:
- y
- =
- a
- -
- b
- 2
- /
- c
- c
- -
- 5
- .
Dependencies are inferred from the claim text.