Abstract: The traditional island detection method on inverter side was analyzed. Based on comprehensive consideration of the advantages and disadvantages of original active voltagepositive feedback, an improved active voltagepositive feedback island detection method was put forward. The Matlab/simulink simulation result shows that comparing with traditional active voltagepositive feedback island detection method, the new method has higher detection speed and does not have detection blind zone, and it influences on the quality of the electric energy of the grid slightly.

Key words: island detection, inverter, active voltage-positive feedback