Electric power systems have traditionally been designed for centralized production. However, during the last decade the sectors of electric energy in several countries have undergone changes in search of the desverticalization and the decentralization of the generation of energy. In this way, distributed generation became an option for the global electric sector. This generation is characterized by different technologies, especially from renewable sources, such as photovoltaic generators. This photovoltaic technology is being increasingly inserted in distribution systems worldwide because it has beneficial characteristics, such as being silent, static and still has the possibility of installing near load using the buildings themselves. This work presents the methodology to allocate and size photovoltaic distributed generation units to the medium voltage distribution network of the neighborhood of Marco de Belém, to analyze the voltage profile and the active losses during the load variation during the hours that these generators can operate. Consequently improve the voltage profile and reduce the active losses of the system. So, load flow simulations were performed through ANAREDE software in thirteen steps, for each hour, from six to eighteen hours, where at each hour the system has a different demand. For the simulations of all hours, satisfactory results were obtained with significant improvements in the voltage profile, expressive reductions of active losses in the studied electrical system.
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