Abstract: In order to solve the problems of frequent connection errors and repeated verification of the virtual terminal circuit of intelligent substation in engineering design,a self-matching method of virtual terminal of intelligent station based on K-nearest neighbor weighting algorithm is proposed.By decomposing the whole station virtual terminal matching problem of the intelligent substation into a typical interval and a single sending and receiving virtual terminal matching connection problem in a single intelligent electronic device(IED),introducing the format composition and connection of virtual terminals,to construct a mathematical analysis model.According to the distance measurement of the attribute connection between GOOSE and SV input and output virtual terminals between IED devices,the distance weight of the attributes is increased by the simulated annealing optimization method to improve the algorithm selection proximity,and the classification decision rule of the K-nearest neighbor algorithm is used to automatically match the corresponding imaginary terminal connection combinations.The accuracy and efficiency of the algorithm are verified by engineering test examples,which improves the connection accuracy of the invisible loop of the intelligent substation and ensures the safe and stable operation of the power grid.

Key words: K-nearest neighbor weighting, Virtual terminals, Self-matching, Simulated annealing, Intelligent substations, IED