| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely obtain a means for detecting the individual operation of an interconnection inverter, when a system undergoes power failure, even when the output and the load of the interconnected inverter connected to the system in parallel with the load are balanced. <P>SOLUTION: An individual operation detection device of an interconnected inverter is connected to a three-phase system and is current-controlled by an active and reactive current commands. The device has a means for determining the internal reference phase of a system voltage, a means for determining a reactive distribution voltage from the internal reference phase of the system voltage and the three-phase voltage, a means for amplifying the reactive distribution voltage, creating a reactive current command for individual operation detection and adding it to the reactive current command, a means for determining an internal inverter frequency from the internal reference phase of the system voltage, and a means for comparing the internal inverter frequency and limit values and outputting a parallel-off command. <P>COPYRIGHT: (C)2003,JPO |
