Optimal Placement and Sizing of DG in Unbalanced Radial Distribution Networks Using Cultural Algorithm

Abstract

Distribution system in our country has radial configuration. Generally, we have three phase four wire line model, where single phase and three phase power can be utilized. Practically, domestic loads consume single phase power. The power consumption capability is not same in each phase. This irregular arrangement of loads makes the system unbalanced. Distribution system has low voltage and high current profile, consequently line current and power losses are different in each phase. The complete power flow for such unbalanced radial distribution network has been computed by backward/forward sweep technique. The main objective of this thesis is reduction of power losses. DG technology has been introduced for providing supplement power to the branches. This power injection process is used for loss reduction. The siting of the DG in unbalanced radial distribution network has been computed by loss sensitivity index and the size of the DG was estimated by Cultural Algorithm technique. The influence of different DGs on the power losses have been demonstrated in this thesis work. The improvement in the voltage profile after DG placement has been graphically represented for different cases.