Distributed generation is required to provide voltage support when failure occurred in distribution network connected with distributed generation, and low voltage ride through capability of distributed generation is required. Therefore, investigating the fault output characteristics of distributed generation during low voltage ride through is significant for fault analysis and protection design. According to the technical requirements for grid connection of connected distributed resources (GB/T 33593-2017), the low voltage ride through control instructions and control rules of distributed generation are established in this paper. The fault equivalent model and current description of distributed generation during low voltage ride through are derived. The basic approach of fault calculation for distribution network containing distributed power supplies is discussed. The correctness of the modeling and theoretical analysis is verified by the simulation results of the example. This work is supported by National Natural Science Foundation of China (No. 51777121).