POWER CONDITIONER, SOLAR BATTERY SYSTEM, AND METHOD FOR JUDGING ABNORMALITY

摘要

In a case that a plurality of photovoltaic strings different from one another in electric power generation such the case that the number of photovoltaic modules constituting each of the plurality of photovoltaic strings varies, an open voltage of each of the photovoltaic strings cannot exactly be detected by measuring the voltage at a parallel connection point. An open voltage value acquisition unit acquire a first open voltage value of a first power supply, when the first switch is in the off period and during a period when a voltage at the side opposite to the first power supply of a first backflow prevention circuit is controlled to be greater than or equal to the voltage at the first backflow prevention circuit on the side of the first power supply. A power supply abnormality determination unit determines whether the first power supply has an abnormality based on comparison between the first open-circuit voltage value and a first reference voltage value that is previously fixed based on a characteristic of the first power supply.