Renewable energy sources based on photovoltaic generation (PVG) are promising energy
alternatives to complement conventional, centralized power generation, as the diesel thermal
plants supplying power to isolated grids in cities and remote locations in the Amazon Region.
The allocation and sizing of generators for distributed generation application (DG) is a challenging
problem, with technical and economic implications related to the planning, design and
operation of these systems. Particularly, the PVG presents added difficulty as it is a function
of environmental conditions, mainly temperature and solar radiation. This thesis presents an
analytical methodology to allocate and size active power photovoltaic generation units with
embedded DC/AC inverter (PVGI) to be integrated as concentrated or dispersed generation in
isolated medium voltage electrical grids. The proposed methodology considers multiple objectives
to be reached namely: improving the electrical grid voltage profile; reducing active power
losses; and reducing the diesel generation participation, providing, this way, a reduction in diesel
oil consumption and in the environmental pollution. The global obtained solution of the
proposed method is a weighted commitment to these goals, presenting different weights according
to priorities established in the electrical system under planning. To validate the proposed
methodology, the IEEE 33 and 69 buses networks and an isolated real electrical system were
modeled and simulated. The real electrical system is located in Aveiro City, in the Amazon
region, Brazil. The simulation results obtained demonstrated that the proposed methodology is
effective in providing a solution with significant improvement in voltage profile, active power
losses reduction, and diesel generation participation reduction, according to viable technical
and economic indicators to the PVGI integration in the isolated electrical grid.
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