Reliability assessment of microgrids with renewable generation by an hybrid model

This paper presents the reliability evaluation of microgrids with distributed generation based on renewable energy sources and storage systems. A hybrid model that combines the analytical approach with state sampling is used in order to consider the intermittence of renewable sources, like wind, solar and small hydro power plants. Batteries are used to reduce the supply intermittence of both the solar and wind generation. The battery state of charge is considered through a specific model. The influence of microgrids on the distribution network power supply reliability is evaluated, together with several relevant aspects, such as the islanding operation success probability, the feeder capacity for load transfer, the battery charge level and size and the type of the renewable source.