| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power conversion device capable of bringing electric power into a reverse power flow and a utility interactive system using this power conversion device. <P>SOLUTION: The power conversion device includes: a power conversion unit that converts the direct-current power of a direct-current power source into alternating-current power and supplies it to a single-phase, three-wire commercial system and an alternating-current load to interconnect them; a commercial system voltage monitoring unit that monitors the commercial system voltage between phases U and O and that between phase O and W of the single-phase, three-wire commercial system; and an output changing unit that connects the power conversion unit to any of between phases U and O, between phases O and W, and between phases U and W. The output changing unit is changed to any of between phases U and O, between phases O and W, and phases U and W according the respective voltages between phase U and O, between phase O and W, and between phases U and W, and brings the power conversion unit and the single-phase, three-wire commercial system into utility interconnected operation. <P>COPYRIGHT: (C)2007,JPO&INPIT |
