US 12,273,069 B2
Abnormality determination system for photovoltaic module and abnormality determination method for photovoltaic module
Yasuyuki Kobayashi, Tochigi (JP); and Naoto Ugajin, Tochigi (JP)
Assigned to Teikyo University, Tokyo (JP)
Appl. No. 18/257,138
Filed by Teikyo University, Tokyo (JP)
PCT Filed Dec. 7, 2021, PCT No. PCT/JP2021/044924
§ 371(c)(1), (2) Date Jun. 13, 2023,
PCT Pub. No. WO2022/138137, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 2020-216691 (JP), filed on Dec. 25, 2020.
Prior Publication US 2024/0030869 A1, Jan. 25, 2024
Int. Cl. H02S 50/15 (2014.01)
CPC H02S 50/15 (2014.12) 6 Claims
OG exemplary drawing
 
1. An abnormality determination system for a photovoltaic module that determines a presence or absence of an abnormality in each of a plurality of photovoltaic cells constituting the photovoltaic module and connected in series, the abnormality determination system comprising:
an irradiation state control unit configured to control an irradiation state of incident light on a photovoltaic cell to be subjected to determination between at least a first irradiation state and a second irradiation state in which a short-circuit current of the photovoltaic cell to be subjected to determination is larger than a short-circuit current of the photovoltaic cell to be subjected to determination in the first irradiation state;
a modulated light irradiation unit configured to irradiate the photovoltaic cell to be subjected to determination with modulated light different from the incident light;
a phase detection unit configured to detect a minute change in an output current of the photovoltaic module in accordance with an irradiation of the photovoltaic cell to be subjected to determination with the modulated light, and output a detection result as a phase detection unit output;
a ratio calculation unit configured to calculate a ratio between a phase detection unit output in the first irradiation state and a phase detection unit output in the second irradiation state; and
a comparison unit configured to compare the ratio calculated by the ratio calculation unit with a threshold value set in advance.