In light of the future situation of large-scale access to distributed generators

a substation optimization method for siting and sizing based on the capacity credit evaluation of the distributed generator (DG) is proposed. First

based on the principle that the reliability of the system remains unchanged before and after DG’s access

a capacity credit evaluation method for DG is proposed from the reliability perspective

which takes the transformer fault and the temporal property of DG’s power supply into consideration. Furthermore

with reference to the weighted Voronoi diagram method

a substation siting and sizing method with DG taken into account is proposed. In the end

both the effectiveness and practicability of the proposed method are verified through comparison and analysis of calculation examples. This work is supported by National Natural Science Foundation of China (No. 51477116).