Patent ID: 8593844

Claim:
An interconnection inverter device for converting direct-current power fed from a direct-current power source to alternating-current power to interconnect to an electric power system, the interconnection inverter device comprising: first and second capacitors which are connected in series between a positive and a negative electrode of the direct-current power source and an interconnection point of which is connected to a first terminal of the electric power system; a reactor with a first terminal connected to the interconnection point between the first capacitor and the second capacitor; a first switch section with a first terminal connected to a positive electrode of the direct-current power source and a second terminal connected to a second terminal of the reactor; a second switch section with a first terminal connected to a negative electrode of the direct-current power source and a second terminal connected to the second terminal of the reactor; a third switch section with a first terminal connected to the second terminal of the reactor and a second terminal connected to a second terminal of the electric power system; a fourth switch section with a first terminal connected to the second terminal of the reactor and a second terminal connected to the second terminal of the electric power system; and a third capacitor connected, in parallel, to the first terminal and the second terminal of the electric power system.