Method for detecting arcs in photovoltaic systems and such a photovoltaic system
First Claim
1. A method for detecting arcs in a direct-current path of a photovoltaic system, comprising the following steps:
- detecting values of a current (IDC) of the direct-current path during a repeating time frame;
generating a mean value of the current (IDC);
detecting values of a voltage (UDC) of the direct-current path during the time frame (t);
generating a mean value of the voltage (UDC); and
continuously calculating at least one detection signal and at least one detection threshold based on the mean value of the current and mean value of the voltage by means of a calculation method,wherein the detection signal and the detection threshold are calculated by means of calculating a difference mean value, a long-term mean value and a long-term difference mean value of each of the current and the voltage by digital low-pass filtering, andwherein a value is generated from the long-term difference mean value and the difference mean value of the voltage, and multiplied by a value generated from the long-term difference mean value and the difference mean value of the current to generate the detection signal.
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Abstract
The invention relates to a method for detecting arcs in a direct-current path of a photovoltaic system, wherein values of a current (IDC) of the direct-current path are detected during a repeating time frame (7) and a mean value (8) is generated, and such a photovoltaic system. In order to reliably detect arcs by means of a component of the photovoltaic system, values of a voltage (UDC), of the direct-current path are detected during the time frame (7) and a mean value (8, 8′) is generated, and at least one detection signal (9) and at least one detection threshold (10) are continuously calculated based on the mean values (8, 8′) for the current (IDC) and the voltage (UDC) by means of a calculation method.
17 Citations
11 Claims
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1. A method for detecting arcs in a direct-current path of a photovoltaic system, comprising the following steps:
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detecting values of a current (IDC) of the direct-current path during a repeating time frame; generating a mean value of the current (IDC); detecting values of a voltage (UDC) of the direct-current path during the time frame (t); generating a mean value of the voltage (UDC); and continuously calculating at least one detection signal and at least one detection threshold based on the mean value of the current and mean value of the voltage by means of a calculation method, wherein the detection signal and the detection threshold are calculated by means of calculating a difference mean value, a long-term mean value and a long-term difference mean value of each of the current and the voltage by digital low-pass filtering, and wherein a value is generated from the long-term difference mean value and the difference mean value of the voltage, and multiplied by a value generated from the long-term difference mean value and the difference mean value of the current to generate the detection signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification