Patent ID: 11909353
Assignee: KEHUA HENGSHENG CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 7:
8. A photovoltaic power generating system, comprising:
a photovoltaic array, arranged to converting solar energy into a DC (Direct Current) power on a DC side;
an inverter, coupled to the photovoltaic array, for converting the DC power into an AC (Alternating Current) power on an AC side;
a plurality of switches, coupled to the inverter, for selectively connecting the AC power to a grid; and
a ground-fault detecting device, coupled between the AC side and a ground, for sampling a voltage of the AC power to detect if a ground-fault occurs in the AC side before the AC power is connected to the grid,
wherein the ground-fault detecting device comprises:
a first detecting module, having an input terminal coupled to a specific-phase electric power of the AC power on the AC side, for sampling a voltage of the specific-phase electric power to generate a sampled voltage; and
a controller, coupled to the first detecting module, for determining if a ground-fault occurs in the AC side before the AC power is connected to the grid according to the sampled voltage, wherein the first detecting module comprises:
a matching impedance device, having a first terminal coupled to the specific-phase electric power; and
a grounding resistor, having a first terminal coupled to a second terminal of the matching impedance device, and a second terminal coupled to the ground;
wherein the sampled voltage is a voltage difference between the first terminal and the second terminal of the grounding resistor.