الفهرس 
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Abstract
The most well-known means for the integration of various renewable energy resources is DC microgrids (DCMGs). MGs are defined as small-sized networks with a set of distributed energy resources (DERs) formed mainly of solar, wind, fuel cells or other renewable energy sources. To achieve the system’s objectives or missions, power flows among Distributed Resources (DR) and load devices in these systems have to be properly regulated. Therefore, the main objective of this dissertation is to control the power flows among distributed devices in DC microgrids. Control of the power flows in DC microgrids involves controlling the current sharing among DR and stabilizing the DC bus voltage. To fulfill these control objectives, voltage droop control has been utilized. However, there is a tradeoff between current sharing among DR and DC bus voltage stability when droop control is used in DC microgrids, as current sharing approaches set points, bus voltage deviation increases.
In this thesis, the new and innovative adaptive droop controller is designed to mitigate the problems of the conventional droop controller, the droop parameters were evaluated online and are adapted utilizing the primary current sharing loops to decrease the deviation in the load current sharing. In addition, the droop lines were shifted by the second loop to eliminate the bus voltage deviation of the DCMGs. The proposed algorithm is assessed under various input voltages and load resistances. The simulation and experimental results illustrate the better performance of the introduced technique compared to classical droop control.