Node standby capacity rapid evaluation method based on invariable node power failure risk

The invention discloses a node standby capacity rapid evaluation method based on node power failure risk invariance, and the method comprises the steps: calculating the difference between the connectivity of each load node and the critical connectivity of each load node, and evaluating the node power failure risk in a normal operation state; evaluating a node power failure risk in each anticipated operation scene; screening out a scene combination having an influence on the power failure risk of the target load node, and screening out a scene with the maximum node connectivity reduction amplitude; and recovering the node power failure risk to the node power failure risk in a normal operation state through a means of reducing the node equivalent load by load response, thereby determining the standby capacity required to be provided by the node load response. According to the node standby capacity rapid evaluation method based on the invariable node power failure risk, the accident standby capacity of each load