Patent ID: 8319370

Claim:
A grid interconnection device connected to a photovoltaic power generator and a power storage device, configured to convert direct current power outputted from the photovoltaic power generator and the power storage device into alternating current power synchronized with a distribution system, to supply the alternating current power to a power consumption device, and to provide reverse flow power to the distribution system, the grid interconnection device comprising: a receiver configured to receive an adjustment instruction that is transmitted through a predetermined transmission path and that is an adjustment instruction to adjust the reverse flow power; and a controller configured to control the reverse flow power to the distribution system on the basis of the adjustment instruction, wherein the controller controls the reverse flow power based on an output power of the photovoltaic power generator and storage capacity of the power storage device, when receiving the adjustment instruction of reverse flow approval allowing a reverse flow, the controller controls the reverse flow power equal to zero, by supplying the output power of the photovoltaic power generator to the power storage device, or when the reverse flow is lower than zero supplying the output power of the photovoltaic power generator to the power storage device and supplying the forward flow power from the distribution system to the power storage device or the power consumption device, and the controller supplies the power stored in the power storage device to the power consumption device, when receiving the adjustment instruction of discharge instruction requesting a discharge of the power storage device.