Research on Operational Risk Index of Distribution Network with Distributed Generation

Abstract This paper analyses the distributed generation’s influence on failure severity index, introduces the index which can represent the probability of islanding and derive the distribution networks’ failure severity index with the connection of distributed generation. This paper analyses how the distributed generation influence distribution networks when the wide-area distributed generation connect with networks, then deriving the distribution networks’ failure severity index with the connection of wide-area distributed generation. Through analysing the same IEEE 33 node network and calculating traditional distribution networks’ reliability index and failure severity index, we can obtain the system’s risk index. By comparing with every index in 3 different conditions, we can find that when the distributed generation connect with distribution networks, the networks’ risk tolerance has been improved, we can also find the significant improvement of distribution networks’ risk index when the wide-area distributed generation connect with distribution networks.