Impact of high permeability DGs on future power system and their reliability assessment

With the penetration level of distributed generation (DG) continues to increase, it is necessary to known the impact of high permeability DGs on power system and their reliability assessment. This paper given some DGs operating characteristics and models for dynamic stability analysis, and the impact of DGs on a local sub-transmission system or a local distribution system was studied. An energy margin sensitivity approach for simultaneously processing a set of severe stability was given and an optimal penetration of DGs decision method was proposed to maximize the penetration level of DG on the system. A modified IEEE 39-Bus test system with DGs is used to prove the validity of the proposed method.