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Asian Journal of Engineering, Sciences and Technology - Volume 10, Issue 1 2020
By Alireza Pourdaryae, Munir Azam Muhammad, Jamil Ahmed Memon, Muhammad Sufyan
Keywords: Reliability, Distributed Generation, Analytical method, Photovoltaic, Wind turbine
In case of a failure in the feeders of the distribution network, some of the customers located on DG-side can directly connect to the Distributed Generative unit (DG). Many researches have so far performed in the field of evaluating the distribution network's reliability in the presence of renewable DG sources. In these researches, it is assumed that, during the failure restoration interval, which results in separating a part of distribution network from its main feeder, the renewable DG unit is able to completely supply the load of the created island, and the rates of generative and consumption of the separated island, in this state, are the same. While the consumer's consumed power has a random nature actually, so it cannot expect that the island consumed power to remain constant always. Also, if the renewable DG unit is a kind of the uncontrollable units (solar and wind units), because of the permanent fluctuation of the unit initial energy, its output generation power fluctuates, and it is possible, sometimes, to be less than the island consumed load. Therefore, the accurate evaluation of distribution network's reliability with the uncontrollable renewable distributed generations requires developing the previous methods and innovating a new method. In this paper, a probability analytical solution is used to evaluate the distribution network reliability the uncontrollable renewable DG sources. In order to evaluate the distribution network reliability, two indexes are used: "system average interruption duration index" (SAIDI) and "system average interruption frequency index" (SAIFI).