Transient Stability Analysis of Asynchronous Distribution Generation and its Impact on Protection

It is of great importance to study the dynamic behavior of distributed generation (DG), which might affect the fault level and protection system of distribution network greatly. In this paper, the transient stability of asynchronous type of DG is comprehensively analyzed. The critical shedding time and corresponding slip of DG are calculated. It is pointed out that the fault clearing time of existing relays cannot guarantee DG operates stable when a fault occurs in distribution network. The countermeasures to low down the possibility of instability of DG are suggested. Finally, case studies are carried out using PSCAD to demonstrate the viewpoint of this paper.