A tandem islanding detection method and phase resonance hop phase bound

The present invention discloses a series resonance and the phase belonging to the field of large-scale anti-islanding protection and new energy concentrated hop network islanding detection method disguise bound. The method is: 1): measurement a, the phase difference between voltage and current b and c three measurement points and; 2): Analyzing and exceeds a threshold value, if did not exceed the threshold value is performed 1), if at least one exceeds the threshold value is performed 3); 3): to delay, the measured voltage and current phase a, b and c and the three measurement points is at least one and, if the delay time can be maintained above a threshold, 5 is performed), if the delay can not be held within the time above the threshold value is performed 4); 4): determining non-island, return 1); 5): island is determined, take appropriate measures to deal with. The present invention does not affect normal operation in the power system power quality, having high detection efficiency when islanding occurs, is a high performance islanding detection method.