FAILURE DETECTION SYSTEM FOR PHOTOVOLTAIC ARRAY
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United States of America Patent
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Issued Date -
Jan 17, 2013
app pub date -
Jul 13, 2011
filing date -
Jul 13, 2011
priority date (Note) -
Abandoned
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Abstract
A process for detecting and terminating a fault in a photovoltaic device is provided that operates in the millisecond or faster timescale. A process includes measuring a current or voltage in each of a plurality of strings relative to a common rail. When the voltage or current from a string is outside a predetermined threshold, a flag is generated indicating the presence of a fault in the string. A control unit will detect the flag and disconnect the faulty string from the system through a switch. The use of continuously rolling averages of baseline currents and voltages as well as a series of measurements averaged to measure the difference of current or voltage at each step provides a process and a fault detection system that does not suffer from false fault detections thereby providing a reliable and efficient system for detecting and terminating faults in photovoltaic devices.
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