| 摘要 |
PROBLEM TO BE SOLVED: To detect transition to independent operation for each distributed power supply due to stopped system operation separately by providing an injection means of interharmonic waves to each one or a group of the power supplies. SOLUTION: Distributed power supplies 6, 6' consisting of more than 1 but less than n-1 out of n linkage operated distributed power supplies 6, 6' are grouped as injection/detection power supplies, and the other remaining ones are grouped as non-injection/detection power supplies. The injection/detection power supplies are provided with an interharmonic wave injecting means and a first detecting means to detect their operation, and the non-injection/detection power supplies are provided with a second detecting means to detect their operation. The injection/detection power supplies inject interharmonic waves to the system in different frequencies for each power supply and detect that they are in independent operation from the voltage changes or impedance (or admittance) changes in each frequency. The non-injection/detection power supplies detect the injected frequency voltage to one of the injection/detection supplies and detect the independent operation from the voltage changes. |
