The existing searching methods for controlled islanding surfaces of power system have two problems: first

these methods can only consider a few constraints

such as the synchronization separation constraints of generators and the power balance constraints of the islanded power system; second

most methods require a lot of manual intervention during the searching process and are unable to automatically obtain the islanding surface from the online scheduling data. Taking the adaptive islanding control of AC/DC systems as the research goal

this paper proposes an index system for islanding control of AC/DC power systems

and designs an automatic searching algorithm for controlled islanding surface of power system based on the greedy algorithm. According to slow coherency grouping results of generators

the number of islanded power grids and the initial node of each grid are obtained. All first-level-connected nodes of each island are scored

then the node that should be incorporated into each island is determined by the scores. Finally

a checkout mechanism is designed to verify the proposed islanding control strategy.