A micro power islanding detection method

The present invention relates to the field of electric power system protection and control microgrid, relates to a method for rapid detection of islanding microgrid, the method for using PQ decoupling control strategy of the inverter type distributed power, the time measurement method in point of common coupling PCC at base load voltage effective value UPCC and reactive power on, by the size of the voltage effective value and UPCC relatively normal, take the appropriate reactive power control strategy. During islanding determination, first predetermined voltage threshold value and the frequency threshold, and UPCC compared with the voltage threshold value, if the value exceeds the threshold, it is determined that the direct islanding state, the round end of islanding detection; otherwise, the PCC voltage at frequency f is compared with the frequency threshold, when the value exceeds the threshold, it is determined islanding state. The present invention can be realized quickly islanding detection micro-grid, in the case where a plurality of still possible to ensure the effectiveness IBDG islanding detection.