A novel synchronous fault identification strategy of electronic transformer based on synergy of historical data

System disturbance caused by line fault, connection or shedding of power source and large load will frequently lead to complicated electromagnetic interference. Subsequently, the abnormal output signal of electronic transformer is likely to be generated due to the deficiency of electromagnetic compatibility, resulting in the maloperation of protection and control system. The aforementioned problems are promising to be solved with the development of substation area protection. In this paper, the existence of the similar region within which the dynamic characteristics of the transmission line fault are of high similarity is proved. Furthermore, the discreteness hypotheses of topology and state of power system are proposed, and the concept of transmission line same-type fault is acquired subsequently. In addition, based on the similarity between a certain dynamic case and the historical case, the principle, criterion as well as implementation to identify the synchronous fault of electronic transformer are proposed, and the evaluation index for describing the fault degree is also given. The feasibility and applied value of the proposed identification strategy are proved based on the simulation model in PSCAD.