Optimal integration of photovoltaic based dg units in distribution network considering uncertainties



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Introduction


In the last few years, considerable attention has been paid to the usage of RES (such as PV, wind, etc.) to minimize power losses due to global environmental problems associated with traditional generation. Many countries have been introduced or are proceeding towards the implementation of renewable energy policies like the Renewable Energy Portfolio Standard (RPS) [1]. Accepting an RPS is a production obligation of a certain percentage of the total electricity production from RES for a specific date. However, available PV energy is unstable and variable. However, high PV integration can lead to large power fluctuations, which may risk the provision of continuous power supply. In addition, the amount of PV energy that can be absorbed by the power system at a particular time may be significantly limited, since the available traditional units may not be able to respond to changes caused by PV units’ fluctuations [2].

PV produces energy when exposed to sunlight, and several other components are needed to properly conduct, control, convert, distribute and store the energy produced by the array. In restructured power systems, the use of distributed generation energy resources, including photovoltaic (PV), fuel cells, small wind turbines, etc. The advantage of distributed generation energy resources includes reducing power losses, improving voltage profile (VP), and increasing network reliability. To achieve the advantages of DG units, the choice of the optimal location and size becomes a major problem [3].



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