Transient interactions of distributed microgeneration

Distributed generation (DG) penetration is increasing due to customer demand for clean renewable energy. Though many studies have addressed issues regarding DG, transient stability issues have been largely neglected. In this paper the interactions of different DG sources with respect to transient stability is examined. A benchmark distribution network and synchronous and induction generators are modeled. The system is faulted in different locations for different combinations of connected generation and load. It is found that the synchronous source increases the critical clearing time of the induction generators while they increase the critical clearing time of the synchronous generator in certain conditions. Increased penetration of induction generators decreases their stability. Active sources of reactive power increase induction generator transient stability.