DC power transmission receiving end power grid section out-of-limit adjustment method and system

The invention provides a DC power transmission receiving end power grid section out-of-limit adjustment method and system. The method comprises the steps of: performing simulation on receiving end power grid section out-of-limit after a flexible DC blocking fault occurs for multiple times; extracting a plurality of groups of units, load adjustment strategies and section state change data of the receiving-end power grid after fault simulation, and performing data processing to form a database; performing association analysis on the database; constraining front and back items of the strong association rule to generate a constrained strong association rule; and adjusting the out-of-limit section according to the generated constrained strong association rule. The method is based on an association rule algorithm in an artificial intelligence algorithm; data processing and correlation analysis are performed on massive fault data, the analysis efficiency of the algorithm is greatly improved through consequent and co