A novel adaptive current protection scheme for distribution systems with distributed generation

摘要

An adaptive current protection scheme is proposed for the protection of power systems with penetration of distributed generation (DG). In this scheme, steady state fault current of the related power transmission lines is derived from steady state network equivalent reduction. Then, settings criteria for adaptive primary and backup protection are established on the basis of the steady state fault current. The simulated results of a realistic power network verify the ranges of adaptive primary and backup protection are immune to implementation of DG and the fault types. Furthermore, compared with traditional current protection schemes, the proposed method has extended the primary and backup protection regions considerably.