Fault location method for distribution network signal recognition combined with digital twin

A fault location method for distribution network signal identification based on digital twin technology is proposed to overcome the dependence of existing active impedance fault location schemes on signal source modules and communication synchronization. A controllable current limiter and signal injection branch is designed. While collaborating with the DC circuit breaker during the fault isolation phase, a single-ended signal injection source can be constructed. After a fault occurs, by controlling the current limiter and utilizing the feedback information from two injected signals, the time decay coefficient of the inductive current can be extracted, allowing for the calculation of fault distance and fault resistance, thus achieving effec tive fault location. This method effectively reduces the dependence of active impedance fault location on signal sources and equipment modifications, thereby lowering implementation costs. Different fault scenarios were simulated using PSCAD/EMTDC, and MATLAB was used to process and analyse the collected current data, resulting in the determination of fault distance and resistance values. Simulation results show that the proposed fault location method can provide accurate location results under various fault conditions.