GROUND FAULT DETECTION DEVICE, GROUND FAULT DETECTION METHOD, PHOTOVOLTAIC POWER GENERATION SYSTEM, AND GROUND FAULT DETECTION PROGRAM

摘要

PROBLEM TO BE SOLVED: To detect ground faults with certainty.SOLUTION: A ground fault detection device 1 detects ground faults of a photovoltaic power generation system 100 having a solar battery string 103 obtained by connecting a plurality of solar battery modules 104 in series, a solar battery array 101 obtained by connecting a plurality of solar battery strings 103 in parallel, and a power conditioner 102. In the ground fault detection device 1, the solar battery string 103 whose ground faults are to be detected by a measurement part 3 and an operation controller 4 is disconnected from the photovoltaic power generation system 100 by a switching part 2. Thereby, a ground capacitance of a ground fault detection target can be reduced, and negative effects caused by the ground capacitance on the ground fault detection can be suppressed. In addition, at the time of the ground fault detection, since the solar battery string 103 is electrically disconnected from the power conditioner 102, negative effects of a noise caused by the power conditioner 102 on the ground fault detection can be also suppressed.