Aid decision making method for out-of-limit of static security analysis device

The invention discloses an aid decision making method for out-of-limit of a static security analysis device, which is characterized by comprising the following steps: carrying out tidal current calculation on a given base data section of a power grid, calculating the sensitivity of branch active power on node active power injection, and calculating cut-off distribution factors of branches quicklyin accordance with the sensitivity information; using contingency screening and rapid analysis of local factorization to calculate a security state of the power grid running under an expected accident and determining an out-of-limit device and tidal current out-of-limit quantity in each cut-off mode; calculating cut-off sensitivity of node injection power on the branch power under the expected accident; calculating the output adjusted quantity of a generator for eliminating the out-of-limit of the branch; and ordering in accordance with the sensitivity and the maximum release quantity respectively so as to form an aid decision making table for out-of-limit of a static security analysis device. The aid decision making method can be used to provide an aid decision making method on the static security analysis quickly.