There is a risk of island operation of a substation brought about by large-scale grid connection of new energy. Thus the whole station island identification technology based on grid topology and vertical communication and the relevant strategy of generator tripping are studied. In view of the complexity of the existing new energy joint tripping of a substation, based on the power grid topology model, the circuit optimization strategy based on the joint tripping matrix is designed, and the mapping relationship between the joint tripping interval and the new energy interval is established. This greatly reduces both the transmission frequency and the difficulty of late operation and maintenance of the power grid on-running equipment during the expansion of the new energy interval. To solve the problem of regional islands, an island wide area discrimination technology based on multi-station information fusion is proposed. This collects and analyzes key information such as switch quantity and power mutation, and obtains reliable discrimination results combined with changes in local electricity consumption. This avoids the risk of standby self-input and re-closing misoperation when an island cannot be quickly identified, and when new energy output and island load are roughly balanced. The research shows that a loop optimization strategy based on the joint tangent matrix can greatly reduce the number of new energy joint tangent loops on site. The island wide area identification technology based on multi-station information fusion can solve the island identification problem when the new energy output and island load are generally balanced. Combined with grid-side over/under voltage and over/under frequency criteria, a complete anti-island solution for a grid-side substation is formed.