Distributed power supply credible capacity evaluation method based on power distribution network security domain

The invention discloses a distributed power supply credible capacity evaluation method based on a power distribution network security domain, and the method comprises the following steps: S1, determining the installed capacity of a distributed power supply and the capacity upper limit of a power distribution feeder line, and building a distributed power supply output and load priority model; s2, generating a system time sequence operation state; s3, judging the system state at the current moment, and generating a radial topological structure of the power distribution network; s4, verifying the topological structure based on the security domain of the power distribution network, and counting the insufficient power supply quantity caused by the power supply adequacy; s5, calculating a reliability index in the evaluation period based on a sequential Monte Carlo method; s6, performing credible capacity search based on a secant string method to obtain the credible capacity of the distributed power supply; accordin