The intermittent and nonlinear characteristics of the distributed generator make it difficult to configure and set the relay protection of the distribution network.Considering the complexity of distribution network structure and the high cost of communication equipment covering the whole network

it is necessary to study the protection adaptive setting method using only local information.In this paper

the output characteristics of inverter interfaced distributed generator is analyzed.The method of calculating the running point for distributed generator before the fault occurs based on local information is proposed

the principle and method of self-adaptive current protection are proposed.This method is independent of communication

and can accurately obtain the real-time operating parameters of the distributed generator

thereby improving the reliability of current protection setting.With the method in this paper

the output of distributed generator can be accurately taken into account in the process of setting the value of protection

which is of great significance to reduce the cost of protection configuration and improve the reliability of protection setting.