Method for judging adaptive statically stable current based on power angle

The invention relates to a method for judging adaptive statically stable current based on a power angle. The cosine component of positive sequence voltage before a fault is utilized for the first time, a result is judged by the method, and an adaptive oscillation lock is quickly unlocked. The method is used for judging the adaptive statically stable current essentially, so oscillation lock overcurrent constant value setting is not needed, the defect caused by constant value setting can be overcome, oscillation and the fault are quickly identified, the fault is quickly removed, and the healthy and stable operation of a system is better facilitated.