Plant automatic synchronizer and method of controlling the same

The present invention relates to automatic grid feed device and a control method thereof, the turbine speed and outputting the detected speed detection signal to detect the speed of the turbine generator of the power station detector; The difference between the frequency of the frequency and the power station of the power system determines whether or not within a predetermined reference value comparison frequency and outputting a comparison result portion; Voltage difference comparison unit the difference between the voltage value and the voltage value of the power station of the power system is judged whether or not within a predetermined reference value and outputting a comparison result; And when the exciter control signal for driving the turbine generator input and detection reference value the frequency comparison result and the voltage difference comparison results in the predetermined or less, based on the voltage value of the power plant and the speed detection signal from the turbine generator when the turbine generator is determined as being normal run and a logic circuit for outputting a blocking operation command signal to the circuit breaker for grid feed. As a result, by sensing the quality of the voltage, the velocity signal in accordance with the operating state of the turbine it is possible to prevent an error when the automatic feed.