The large number and dispersed access points of distributed generators (DGs)

and the output characteristics during faults depending on their low voltage ride through control strategy

make it difficult to derive analytical expressions of fault current and voltage in the distribution network

as well as explain the mechanism and law of fault current and voltage changes. In order to solve these problems

a short-circuit fault calculation and analysis method of distribution network with high proportion DGs based on aggregated current is proposed. First

DGs are classified and aggregated based on their locations

considering their different influence on the branch short-circuit current. A nodal impedance matrix is then formed by a path matrix to determine the aggregation location. Next

the analytical expressions of short-circuit fault current and voltage calculation based on the aggregated short-circuit current are derived. Furthermore

based on the aggregated short-circuit current and analytical expressions

the impact of DGs connection on fault current and voltage is analyzed from a mechanistic perspective

exploring the variation patterns of fault current and voltage with respect to aggregated short-circuit current. Finally

case studies verify the correctness of the proposed fault calculation and analysis method.