An Improved DBSCAN Method for Self-sufficient Microgrid Design

Self-sufficiency is a key feature of a microgrid with distributed energy resources (DERs) and energy storage. Due to sizing interdependency between DERs and energy storage, the size relationship across them is investigated based on given models. For siting of DERs and storage, the new proposed method, DBSCAN based on load-impedance density, is applied to identify high load-impedance areas. For selected sizes of DERs and energy storage, siting with less power loss is achieved by comparing results of graph partition, the shortest path method, DBSCAN, and improved DBSCAN methods. The results show the proposed method identifies the members and centers of load clusters, as well as load-impedance density for each cluster. The center with high load-impedance density is the place to locate DERs and energy storage to reduce energy losses with given DERs and load profiles in the distribution system.