| 摘要 |
A switching unit (40) switches between a utility interconnection mode in which a utility power supply (200), the AC side terminal of a storage battery power conditioner (20), and the AC side terminal of a first PV power conditioner (60) conduct each other and a stand-alone mode in which the AC side terminal of the storage battery power conditioner (20) and the AC side terminal of the first PV power conditioner (60) conduct each other while the utility power supply (200) is disconnected. A second PV power conditioner (80) converts the DC power generated by a second photovoltaic cell (70) to AC power and outputs the AC power to the utility power supply (200) without interposing the switching unit (40). A fourth switch (S4) is a switch for allowing the DC side terminal of the first PV power conditioner (60) and the DC side terminal of the second PV power conditioner (80) to conduct each other. A switch control circuit (90) turns on the fourth switch (S4) in the stand-alone mode when the input or output of the first PV power conditioner (60) is a threshold value or less. |
