A New Analytical Method for the Sizing and Siting of DG in Radial System to Minimize Real Power Losses

Abstract

To minimize line losses of power systems, it is crucially important to define the size and location of local generation to be placed. On account of some inherent features of distribution systems, such as radial structure, large number of nodes, a wide range of X/R rat ios; the conventional techniques developed for the transmission systems generally fail on the determination of optimu m size and location of distributed generations. In this study, a loss sensitivity factor, based on the equivalent current injection, is formu lated for the distribution systems. The formulated sensitivity factor is emp loyed for the determination of the optimu m size and location of distributed generation so as to minimize total power losses by an analytical method without use of admittance matrix, inverse of admittance matrix or Jacobian matrix. The proposed method is in close agreement with the classical grid search algorith m based on successive load flo ws.