Nowadays, the penetration of distributed generation (DG) in power networks takes special place worldwide and is increasing in developed countries. In order to improve voltage profile, stability, reduction of power losses etc, it is necessary that, this increasing of installation of DGs in distribution system should be done systematically. This paper introduces an optimal placement method in order to sizing and sitting of DG in IEEE 33 bus test system. The algorithm for optimization is particle swarm optimization (PSO). The proposed objective function is the multi objective function (MOF) that considers active and reactive power losses of the system and the voltage profile in nominal load of system. High performance of the proposed algorithm is proved by applying algorithm in 33 bus IEEE system using MATLAB software and in order to illustrate the feasibility of the proposed method optimization in three cases: one DG unit, Two DG units, and Three DG units- will achieved.
Key words: Distributed generation (DG), placement, particle swarm optimization, multi objective function (MOF), optimization.
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