Comparison of Optimal DG Placement in Radial Distribution System Using Centrality Index

Distribution system usually functions at low voltage and high currents, which consequently develops excess power loss along with poor voltage profile. Various methods have been suggested to resolve the problems of distribution system like loss reduction, voltage profile enhancement, and curtailment of network operational cost. Optimal distributed generation (DG) allocation is one of the pre-eminent strategies to maintain the operational security of distribution system. In this article, optimal placement of two dissimilar types of DGs is compared in radial distribution network for voltage profile improvement. Electrical centrality indices are applied for identifying the optimal location of DGs and capacity of DGs is optimized to improve the voltage profile, which consequently reduces system loss. By using electrical centrality indices, two dissimilar types of DGs are placed in network separately and system performance is compared. The proposed method evaluates the placement of different types of DGs in 34-bus radial distribution network as well as 69-bus radial distribution network.