The fault current of distributed generation is nonlinear and intermittent

which brings challenges to the setting and coordination of the traditional three-stage overcurrent protection in distribution networks. Aiming at this problem

the control strategy and fault characteristics of inverterubased distributed generation are analyzed

and combined with the positive sequence fault additional network

an overcurrent protection setting scheme suitable for the distribution networks with distributed generation is proposed. The scheme firstly uses the idea of adaptive protection to design the main protection setting method

and then the overcurrent relays on both sides are used as the near backup protection for the faults occurring near the other terminal

and finally the definite time overcurrent protection is used as the far backup protection for the entire line. Simulation results based on PSCAD show that the proposed scheme can reliably and accurately identify the faults with different types and locations.