Distribution System Reliability Evaluation in Presence of DG

In modern distribution power systems Distributed Generation (DG) is performing a major role in supplying energy to the distribution system loads. Reliability indices of distribution system with DG is a key parameter used to evaluate the advantages of adding such DG to the distribution system. Distribution system reliability is calculated by using two main techniques analytical and simulative. In this paper, the effect of connecting Photovoltaic (PV) source and energy storage element to the distribution system on its reliability performance will be analyzed. Markov modelling is used to generate a realistic multi state model for PV and battery, the output failure and repair rates results from the modeling are then used in the reliability evaluation of distribution system. The overall system reliability is carried out using NEPLAN software package. Roy Billinton bus 2 Test System is used to evaluate reliability and cost indices for different case studies. The simulation results show that PV plus energy storage integration will improve the reliability indices of the original distribution system in condition of optimum sizing and siting of the PV plus energy storage systems.