Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Socomec

Alexandre Plissonnier

Nicolas Chaintreuil

Sylvain Lespinats

Christian Kern

Franck Al Shakarchi

Annalaura Fasiello

Cédric Gouy-Pailler

Arnaud Revel

Cédric Gouy-pailler

A method estimating a series or parallel nature and a location of an arc in a photovoltaic device, operating under direct current, including N (N=1 or N&#x3e;1) strings of photovoltaic modules, connected to a charge device having a capacitive behaviour for the modules, the method including: a) detecting, at terminals of each of the modules of each string, evolution of voltage over time, during formation of an electric arc; b) identifying the modules at the terminals of which a voltage variation occurs between a first zone with stable voltage and a second zone with stable voltage for a duration of at least 5 &#x3bc;s, which immediately follows the voltage variation, and identifying the sign of each voltage variation; c) estimating the series or parallel nature and the location of the arc in the photovoltaic device.

Electric arc detection in photovoltaic installations

Method for detecting an electric arc in a photovoltaic installation, characterized in that it comprises the following steps:

Method and device for detecting an electric arc in a photovoltaic installation

Method for detecting an electric arc in a photovoltaic installation, which includes measurement (E) of voltage values at at least one site of the electrical circuit of the photovoltaic installation; digitization (E) of the measured voltage values so as to form voltage data; formation (E) of a window of n recent digitized voltage data; computation (E) of a test value associated with the said window of the n voltage data; analysis (E) of a test vector comprising m test values associated with m recent windows generating a quantity arising from this analysis representative of a risk of electric arc; comparison (E) of this quantity arising with at least one threshold so as to deduce therefrom the presence or otherwise of an electric arc within the photovoltaic installation.

Method and device for detecting electrical arcing in a photovoltaic installation

A method detecting a parallel arc in a photovoltaic device, including N (N=1 or N&#x3e;1) photovoltaic modules, connected to a charge device having a capacitive behavior for the modules, the method including: a) detecting, across main terminals of the device, evolution of voltage over time, at least during formation of the electric arc; b) identifying a negative voltage variation between a first zone with stable voltage and a second zone with stable voltage for a duration of at least 5 &#x3bc;s, which immediately follows the voltage variation, and c) determining whether the voltage variation is between a maximum value Vmax, greater than or equal to 100 V, and a minimum value Vmin, less than or equal to 30 V, with a fall time of this variation between a minimum duration Tmin greater than or equal to 0.01 &#x3bc;s and a maximum duration Tmax less than or equal to 10 &#x3bc;s.

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Pont-de-Claix, France

Alexandre Plissonnier