| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for detection of an individual operation capable of detecting the individual operation of a power supply reliably in a system-interconnection system even when the influence of an active change provided to an output power of an interconnection inverter is hard to appear in system periods. <P>SOLUTION: A measurement unit 332 measures the system periods of a system power supply in every cycle. An averaging processing unit 334 calculates an average system period for each predetermined period based on the system periods measured in the measurement unit 332. A decision unit 336 computes a deviation between each of the plurality of latest average system periods calculated in the averaging processing unit 334, and each past average system period for a predetermined period. When each computed deviation is over the corresponding predetermined threshold, it is determined that the power supply is in an individual operation state. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
