Optimal Siting and Sizing of the DG in the Distribution Network: a Multi-Criterion in the Loss Reduction and System Upgrading Deferral

Loss reduction and system upgrading postponement are two crucial factors respectively in reducing the operational cost (current cost) and deferring distribution companies (DISCO) going to the expense of infrastructure development. Today, great attention has been paid to the distributed generation as a tool affecting current and capital costs of the companies by distribution systems programmers and designers. A main problem is that the two objectives are not in full alignment. In one hand, locating the DG, with the aim of loss reduction, does not result in a maximum postponement of the system upgrading. On the other hand, locating the DG, with the aim of postponing the system upgrading, does not result in a maximum loss reduction. Regarding these two objectives, the present paper has been to decide on the optimal siting and sizing of DGs. The capabilities of DGs in postponing the system upgrading, as a well documented issue in previous studies, has been made, here, a quantitative index to be used in development perspective. Through an enhanced genetic algorithm (EGA) beside a strategy to penalize the unfeasible responses (i.e. penalty strategy), the optimization has been done. The suggested method regarding the dominant constraints has been applied to IEEE 33-bus test feeder and the results have been analyzed The results come up with the profound effect of the DGs in postponing the system's upgrading and loss reduction. Copyright (c) 2010 Praise Worthy Prize S.r.l. - All rights reserved.