الفهرس 
Control Strategies for MicrogridOnly 14 pages are availabe for public view
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Abstract
The last few years showed large penetration of wind and solar energy into the microgrid as renewable energy sources. So, there is a need to use energy storage units in order to maintain balance between generated and demand power. This thesis addresses the feasibility of using Battery Energy Storage System (BESS) to decrease the fluctuations of renewable energy sources. Due to high cost of batteries, an efficient operation should be achieved of BESS to extend their life time. Hence, an adaptive droop control for balancing SOCs of multiple batteries in DC microgrids is presented in this thesis. The droop-based power technique was used, and the droop gain was calculated using the power function with proper adjustment of the power order “n” and the battery capacity is taken into account. Proper sizing of PV array, wind energy system, battery bank, charger, and converter was performed based on the daily energy consumption and the maximum load power. The droop control succeeded to force the battery with higher SOC to deliver more power in discharging mode and absorb lower power in charging mode until all SOCs became close to each other. On the other hand, a Maximum Power Point Tracking (MPPT) control and droop control were developed for the PV and wind energy systems. The MPPT control succeeded to extract the maximum power from the PV system and wind system, while, the droop control on PV system maintained the DC bus voltage within its allowable limits when SOCs of batteries attained their maximum limit. Finally, a general strategy with simple and cheap controller is presented and showed its effectiveness in achieving all possible requirements of the DC microgrid.