The rapid spreading of the Photovoltaic (PV) Systems as Distributed Generation\n(DG) in medium and low voltage networks created many effects and\nchanges on the existing power system networks. In this work, two methods\nhave been used and applied to determine the optimal allocation and sizing of\nthe PV to be installed as DGs (ranging from 250 kW up to 3 MW). The first\none is to determine the location according to the maximal power losses reduction\nover the feeder. The second one is by using the Harmony Search Algorithm\nwhich is claimed to be a powerful technique for optimal allocation of\nPV systems. The results of the two techniques were compared and found to\nbe nearly closed. Furthermore, investigation on the effects on the feeder in\nterms of voltage levels, power factor readings, and short circuit current levels\nhas been done. All calculations and simulations are conducted by using the\nMATLAB Simulation Program. Some field calculations and observations have\nbeen expended in order to substantiate the research findings and validation.
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