The use of distributed generation (DG) in radial distribution networks is currently increasing drastically. Finding the best position and size for distributed generation on radial networks using a selected optimization technique is thus addressed in this paper in order to contribute to the reduction of real power losses on radial feeders. The proposed approach seeks the best location by rotating the DG on all buses, calculating the active losses, and improving voltage variation. The selection mechanism for the best location, then injects DG on a specific bus to achieve the lowest losses and minimum voltage variation. The best sizing for DG may be achieved by adopting particle swarm optimization (PSO), and IEEE -33 buses and the Karbala Radial Medium Voltage Network (KRMVN) were tested using this method to verify the superiority and efficiency of the suggested scenario. The simulation results suggested that the best sizing of the DG unit in the first case was 2.5774 MW, and the best location was at bus 6 for the IEEE -33 buses. The reduction rate of real power losses achieved by PSO was 47.38% as compared with the result before DG injection in that case. The best sizing and position of the DG was found to be 7.8718 MW at bus 10 for KRMVN, with the reduction rate of real power losses achieved by PSO being 59.70% as compared with the corresponding result without DG.

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