الفهرس 
Hierarchal Control of MicrogridOnly 14 pages are availabe for public view
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Abstract
Most electrical grids rely upon huge large central power stations for production of electricity; such plants are fueled with gaseous oil, coal or nuclear. Energy production from petroleum derivatives deliver noteworthy amount of CO2. The energy dilemma is both very simple and exceptionally complex to understand. The request of electricity is developing ceaselessly while at the meantime the CO2 outflow must be lessened to dodge serious climatic changes. Inexhaustible energy sources such as solar and wind energy give a contamination free form of energy. Utilizing small scale of energy generation advancements located near to the load is known as dispersed generation and known as distributed generation (DG). The utilization of DG diminishes energy losses by delivering energy near to the end user.
This thesis exhibits the idea of the hierarchal control of microgrid which is separated to three fundamental sections. The primary control which is in charge for load sharing among various DG units (equally or as per their ratings). The secondary control is in charge of restoring voltage and frequency to nominal values. Finally, the tertiary control which is in charge of power exchange between the microgrid and the main grid if the grid is in the grid connected mode. At that point an approach of primary and secondary control for an islanded microgrid is exhibited. A generalized droop based primary control is utilized to guarantee accurate load sharing among the DG units of the microgrid. In addition, the generalized droop characteristics takes into account the cable resistance and inductance. Moreover, the secondary control provides a frequency compensation signal that shifts the droop characteristics to restore the frequency of the microgrid to its nominal value regardless loading conditions. Two types of secondary controller are tested, and results are compared. The first type is the classical PI controller and the second one is the adaptive PI controller. The PSCAD/EMTDC software package is used to simulate the proposed system under different cases of loading. The utilized control system of the microgrid is examined. Simulation results are utilized to assess the dynamic performance of the proposed system.