Abstract: The present invention relates to a system and method for controlling an output evaporation rate of a wind power plant. The system includes a wind power plant control unit configured to measure an output value of a wind power plant before a predetermined time from an output control time of the wind power plant, calculate a maximum output value of the wind power plant on the basis of the measured output value of the wind power plant, and distributing individual maximum output values of the wind power plant to individual wind power generators in the wind power plant and a wind power generator control unit configured to control outputs of the individual wind power generators according to the individual maximum output values when the individual maximum output values are distributed to the individual wind power generators.

Abstract: A control method for preventing malfunction of an over current ground relay is disclosed. The control method includes: determining directions of per-phase power flows by measuring the magnitudes and phases of per-phase voltages and currents in an electric power system; checking occurrence of a load fault or a power source fault using the determined directions of per-phase power flows; and controlling an over current ground relay (OCGR) or an over current relay (OCR) to transmit a trip signal to a circuit breaker, after, upon occurrence of a load fault, checking occurrence of a ground fault and checking occurrence of a short circuit fault, and, upon occurrence of a power source fault, checking occurrence of a short circuit fault without checking occurrence of a ground fault, by turning on or off the OCGR or the OCR according to occurrence of a ground fault or a short circuit fault.