考虑故障拓扑变化的自适应三相重合闸策略OA

The fault topology of transmission lines exhibits diversity and uncertainty,making the traditional adaptive re-closing criteria prone to inaccurate fault nature determination.To address this issue,an adaptive reclosing strategy suit-able for scenarios with changes in the transmission line fault topology is proposed.First,based on the state reference models of transmission lines under different types of fault,the coupled current balance relationships within the lines are systematically analyzed,so as to elucidate their underlying mechanisms.Second,an in-depth comparison of the funda-mental differences between transient and permanent faults is conducted,and the distinct characteristics of coupled cur-rents under both scenarios are analyzed to provide critical reference for the fault nature criteria.Finally,on the basis of the analysis result,a fault nature criterion based on the coupled current balance characteristics is proposed,and the corresponding adaptive reclosing strategy is formulated accordingly.Through theoretical derivation and PSCAD/EMTDC simulation verification,it is demonstrated that this method can accurately determine the fault nature under changes in the fault topology,and it is unaffected by transition resistance or fault location.