Failure diagnosis method and failure diagnosis system for photovoltaic system

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United States of America Patent

PATENT NO 9998071
SERIAL NO

14484303

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Abstract

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A failure diagnosis system is configured to calculate an estimated irradiation on a first photovoltaic string and an estimated operating temperature of the first photovoltaic string based on a short-circuit current and an open-circuit voltage on a current-voltage characteristic of the first photovoltaic string, and the array output voltage value and the array output current value measured by an array measurement apparatus. The failure diagnosis system is configured to calculate an estimated current value of the first photovoltaic string based on the estimated irradiation, the estimated operating temperature, and the current-voltage characteristic. The failure diagnosis system is configured to diagnose degradation of the first photovoltaic string by comparing the measured current value of the first photovoltaic string and the estimated current value.

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HITACHI LTDTOKYO 100-8280

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kouno, Toru Tokyo, JP 12 28
Miyazaki, Satoshi Tokyo, JP 155 2119
Morikawa, Koki Tokyo, JP 5 15
Nagayama, Yuuichi Tokyo, JP 4 20
Nakamura, Tomoharu Tokyo, JP 58 485
Ohya, Tetsuharu Tokyo, JP 5 92

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