Renewable energy generation systems and anti-islanding his way

The present invention can reduce not detected area while minimizing the degradation of the power quality, and can take advantage of a passive detection method and an active detection method for a hybrid detection system mixing, using a passive detection techniques, primarily, actively derivative It can use detection techniques, and until it reaches the first set value using the passive detection techniques, until it reaches the second set value and provides the sole protection operation using the active detection technique. Renewable energy power generation system with a single operation preventing function of the present invention, an inverter for converting a DC voltage supplied from a renewable energy source into an AC voltage; 3-phase / 2-phase converter for converting the output of the inverter to the three-phase / two-phase stationary coordinate system; The 3-phase / 2-phase using the second phase voltage outputted from the converter phase-locked loop that calculates the phase and frequency of the output voltage of the inverter; The phase using the current amplitude reference value supplied from the frequency and the external output from the locked loop by comparing the size of the output frequency of the inverter to each other, a plurality of threshold values, and optionally other, and electric current to control the output phase of the inverter phase reference a phase adjuster to generate a value; The phase using the phase angle output from the current phase-locked loop for converting the reference value and said current amplitude reference value outputted from the phase control to the two-phase stationary coordinate current reference coordinate converter; Phase current computing unit for outputting the phase current calculated value by subtracting the phase component of the output current output from the two-phase current transformer in the current phase reference value of the two-phase stationary coordinate output from the current reference coordinate converter; Current amplitude computing unit for outputting the current amplitude value calculated by subtracting the amplitude component of the output current output from the two-phase current transformer in the current amplitude reference value of the two-phase stationary coordinate output from the current reference coordinate converter; A current regulator for generating a current control signal using the calculated phase current value and the current amplitude calculation value; Outputting three-phase converter for converting the current control signal of the two-phase stationary coordinate output from the current control to the current control signal of the 3-phase stationary coordinate system; And a PWM controller for outputting a PWM control signal to the inverter using the current control signal of the three-phase stationary coordinate output from the output three-phase converter.