Photovoltaic power generation equipment insulation monitoring device and photovoltaic power generation equipment insulation monitoring method

摘要

The present invention provides an insulation monitoring device for a photovoltaic power generation facility and a method for monitoring the insulation of a photovoltaic power generation facility capable of measuring an insulation resistance before and after a power conditioner by measuring a voltage between resistors. When the voltage seen from the ground to a P-phase terminal (4p) is Vrp during interconnection operation via a power conditioner (7), if the sign of the voltage value (Vrp) is negative, the voltage on the AC side of the power conditioner (7) is reduced. It is determined that the insulation resistance has decreased, and if the sign of the voltage value Vrp is positive, it is determined that the insulation resistance on the DC side of the power conditioner 7 has decreased. [Selection diagram] Fig. 2