| 摘要 |
PROBLEM TO BE SOLVED: To provide a power conditioner system for photovoltaic power generation capable of detecting fine ground fault of a DC power line.SOLUTION: A power conditioner system 100 for photovoltaic power generation according to one embodiment comprises: an inverter 10 converting a DC power inputted from a solar battery 1 via a DC power line 4 into an AC power, and outputting the AC power to an AC power line 5; and a ground fault detector 30 detecting ground fault of the DC power line 4. The ground fault detector 30 has: a control signal generator 31 generating an inter-order high harmonic wave control signal for generating an inter-order high harmonic current signal having a frequency of a non-integer multiple of a frequency of a fundamental wave of a system power supply 3; a signal injection part 10 injecting the inter-order high harmonic current signal to the AC power line 5 depending on the inter-order high harmonic wave control signal; a filter part 16; and a determination part 32 determining ground fault of the DC power line 4 from a measurement result of the inter-order high harmonic current signal in the filter part 16. |
