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

Socomec

Stéphane Siat

Nicolas Chaintreuil

Christian Kern

The photovoltaic installation being intended to supply an electric current (i), the method comprises the steps of measuring (e0) values representative of the electric current (i) supplied by the photovoltaic installation; adjusting (e2) a variable current jump threshold (s(ti)) according to measured values; detecting (e3) a current jump with an amplitude greater than a current jump threshold adjusted according to values measured before the jump; and detecting (e5) an electric arc based on the detection of a current jump.

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

A photovoltaic installation comprising at least one photovoltaic module () and an electromechanical unit capable of producing a non-stray electric arc of a duration less than or equal to a given arc-quenching duration (x) when contacts of the electromechanical unit are opened. The photovoltaic installation comprising a method comprising the steps of: detecting (E) the appearance of an electric arc in a photovoltaic installation; triggering (E) a timer to start timing from the moment (T) of appearance of an electric arc; measuring (E) at least one of electric quantities of a group including a voltage (V) of the at least one photovoltaic module and a current (I) produced by the photovoltaic installation at the end of the arc-quenching duration starting from the moment (T) of appearance of the electric arc; comparative testing (E; E) in order to determine whether the measured electric quantity is equal to an open-circuit voltage (V) of the photovoltaic module or to a zero current; and, if the test is negative, identifying a stray electric arc.

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

The method comprises the steps of measuring (E) a voltage signal at the terminals of at least one photovoltaic module of the installation () with a sampling frequency greater than or equal to 50 kHz and, from the measured voltage signal, determining an initial voltage preceding the appearance of the arc and voltage values during the electric arc; evaluating values of an electric current produced by the photovoltaic installation during the electric arc; time integration (E) of the product of arc voltage values equal to the difference between the voltage values during the arc and the initial voltage, determined in step A), and current values evaluated in step B), in order to determine the energy of the arc.

Method and device for evaluating the energy produced by an electric arc in a photovoltaic installation

The invention relates to a method including the steps of measuring (EO) an electric current signal produced by the apparatus () at a sampling rate no lower than 50 kHz, and, from the measured current signal, determining (E) an initial value () of the current before the occurrence of an electric arc, determining (E) current values (Iarcj) during the electric arc, evaluating (E) arc voltage values from the current values determined during the arc and from the initial value of the current, integrating (E) over time the product of the arc voltage values evaluated by the determined current values, in order to determine the energy of the arc.

Growing community of inventors

Obenheim, France

Stéphane Siat