Slow coherency based adaptive controlled islanding scheme of the China Southern Power Grid

Emergency islanding control is the last line of defense to avoid power system collapse, and it plays an important role in the prevention of large scale blackout. This paper carries out the study of slow coherency based adaptive controlled islanding aiming to design an islanding control scheme applicable to AC/DC interconnected power systems. Firstly, a slow coherency based islanding method is proposed based on the mode information in form of complex number, which can deal with the load buses. Then, several criteria are introduced to determine whether an AC/DC hybrid grid is suitable to be split. Finally, the scheme and the criteria are used to design an appropriate islanding scheme for the China Southern Power Grid.