| 摘要 |
PURPOSE: A method is provided to detect and prevent an individual operation of a dispersing type power supply together with a partial load according to a power stoppage of a utility power system. CONSTITUTION: A first voltage of a utility power system side is compared with a second voltage of a dispersion power supply side. An individual operation of a dispersing type power supply is detected by detecting that a phase difference and a frequency difference between the first and second voltages are greater than allowable reference values. When the individual operation of a dispersing type power supply is detected, an individual operation detection related control signal is transmitted to a decoupling point breaker of a utility power system and a dispersing type power supply so that a main breaker trips a dispersing type power supply in an individual operation in order to prevent an individual operation of the dispersing type power supply.
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