Photovoltaic module abnormality determination system, photovoltaic module abnormality determination method, and program

A photovoltaic module abnormality determination method comprising:

• an output current acquisition step of acquiring an output current of the photovoltaic module during power generation;
• a light shielding rate acquisition step of acquiring a light shielding rate of a determination target photovoltaic cell that is a photovoltaic cell corresponding to a determination target for presence or absence of an abnormality in a parallel resistance component;
• and
• an abnormality determination step of
• determining that the abnormality is not present in the parallel resistance component of the determination target photovoltaic cell in a case where a light shielding rate range of output current change, which is a range of the light shielding rate of the determination target photovoltaic cell in which the output current of the photovoltaic module changes in accordance with a change in the light shielding rate of the determination target photovoltaic cell in a case where the light shielding rate of the determination target photovoltaic cell is changed, is between a light shielding rate of 0 and 1 of the determination target photovoltaic cell, and
• determining that the abnormality is present in the parallel resistance component of the determination target photovoltaic cell in a case where a light shielding rate range of non-output current change, which is a range of the light shielding rate of the determination target photovoltaic cell in which the output current of the photovoltaic module hardly changes even in a case where the light shielding rate of the determination target photovoltaic cell is changed, is between the light shielding rate of 0 and 1 of the determination target photovoltaic cell,
• wherein, the photovoltaic module abnormality determination method determines presence or absence of an abnormality in a parallel resistance component of each of a plurality of photovoltaic cells connected in series to constitute a photovoltaic module.

A non-transitory computer-readable storage medium storing a program for causing a computer to execute processing comprising:

• an output current acquisition step of acquiring an output current of the photovoltaic module during power generation;
• a light shielding rate acquisition step of acquiring a light shielding rate of a determination target photovoltaic cell that is a photovoltaic cell corresponding to a determination target for presence or absence of an abnormality in a parallel resistance component;
• and
• an abnormality determination step of
• determining that the abnormality is not present in the parallel resistance component of the determination target photovoltaic cell in a case where a light shielding rate range of output current change, which is a range of the light shielding rate of the determination target photovoltaic cell in which the output current of the photovoltaic module changes in accordance with a change in the light shielding rate of the determination target photovoltaic cell in a case where the light shielding rate of the determination target photovoltaic cell is changed, is between a light shielding rate of 0 and 1 of the determination target photovoltaic cell, and
• determining that the abnormality is present in the parallel resistance component of the determination target photovoltaic cell in a case where a light shielding rate range of non-output current change, which is a range of the light shielding rate of the determination target photovoltaic cell in which the output current of the photovoltaic module hardly changes even in a case where the light shielding rate of the determination target photovoltaic cell is changed, is between the light shielding rate of 0 and 1 of the determination target photovoltaic cell,
• wherein presence or absence of an abnormality in a parallel resistance component of each of a plurality of photovoltaic cells connected in series to constitute a photovoltaic module is determined.