| 摘要 |
<p>[Problem] The purpose of the present invention is to provide a grid connection device that makes it easy to use a load that runs on single-phase AC power. [Solution] This grid connection device is characterized by the provision of the following: an inverter circuit (5) that outputs AC power to three output wires (Lu, Lv, Lw), namely a U-phase wire (Lu), a V-phase wire (Lv), and a W-phase wire (Lw); grid connection relays (7) that are located on the three output wires (Lu, Lv, Lw) and connect/disconnect the inverter circuit (5) to/from a utility power grid (3); and wires (La, Lb) that branch off from two of the three output wires (Lu, Lv, Lw) and are connected to a load via independent-operation relays (8). This grid connection device is further characterized in that: when the utility power grid (3) and the inverter circuit (5) are running in an interconnected mode, the inverter circuit (5) superimposes three-phase AC power onto the utility power grid (3), and when running in an independent-operation mode in which power is supplied to a load with the inverter circuit (5) decoupled from the utility power grid (3), the inverter circuit (5) converts DC power to single-phase AC power and outputs said AC power to the abovementioned wires (La, Lb).</p> |
