A passive islanding detection method based on interharmonic impedance

In this paper, a passive islanding method based on PCC point interharmonic impedance measurement is proposed to solve the problem that the passive passive islanding detection method is too large to detect the dead zone. Which also overcomes the problem that the traditional impedance measurement method increases in the non-detection area (NDZ) when the multi-inverter is juxtaposed, and avoids the power quality problem caused by the active detection. Finally, the accuracy of this method is verified by simulation.