With the continuous expansion of the scale of the power grid, the requirements for the rapidity and precision of the action of the load shedding device are continuously improved. In order to solve the load shedding optimization problem efficiently, this paper proposes a precise load shedding method based on ordered tree implicit enumeration method. This method coordinates the under frequency load shedding (UFLS) and under voltage load shedding (UVLS) action rounds, establishes the load shedding optimization model and the ordered tree branch diagram, and optimizes only within the feasible solution range according to the level of the load, which greatly improves the efficiency of calculating optimal solutions. The simulation shows that this method not only meets the requirements of the rapidity and stability of the load shedding system, but also improves the level of refinement of the load shedding control under the emergent situations.

hierarchical idea,load shedding optimization strategy,UFLS and UVLS coordination,implicit enumeration method