Simpson’s Rule Differential Protection for New Energy Power Plant Outgoing Line

Abstract

New energy power supplies are connected to the grid through converters, and the fault features of short-circuit currents include small current amplitudes, power frequency variations, and phase limitations, which may reduce sensitivity of traditional differential protection, and even cause uncorrected operation. This phenomenon is particularly prominent in new energy power plants outgoing lines. Therefore, this article firstly discussed the fault feature of new energy sources. Then a theory of current differential protection based on Simpson’s Rule integration is put forward, which can reliably identify the internal or external faults. Finally, build the relevant simulation model to prove the performance of Simpson’s Rule differential protection scheme for new energy power plant outgoing line. The simulation results have suggested that the protection scheme fully satisfies the demands of safe operation of energy power plant.