الفهرس | Only 14 pages are availabe for public view |
Abstract The pressing need for more electricity, the environmental issues brought on by centralized conventional fossil fuel-based power plants, rapid advances in power electronic converters, and renewable energy technology have all contributed to a significant growth of renewable energy and conversion systems in electric power systems, which are now cost-competitive with fossil fuel-based power plants. Moreover, to avoid using lengthy transmission lines with their associated losses and expenses, microgrids (MGs) are considered the ideal alternative for energizing isolated or rural areas. The different standalone and grid-connected renewable energy sources systems are carefully examined in this thesis. These include solar photovoltaic (PV), wind energy conversion (WEC), solar PV/battery, hybrid solar PV/wind/battery, and hybrid solar PV/wind/grid systems. These systems modeling, control, simulation, and performance assessment are discussed in various case studies. The performance of the solar PV system is compared using the most appropriate maximum power point tracking (MPPT) control technique, namely the incremental conductance (IC) with an optimized proportional integral (PI) controller method, using particle swarm optimization (PSO), Harris Hawks optimization (HHO), and honey badger algorithm (HBA) method. The control approach employed in the solar PV/battery system for regulating the DC link voltage at the desired value is based on the bidirectional converter with an optimized PI controller. The control scheme employed in the wind energy system for generating the maximum power available from the wind turbine at different wind speeds is based on the perturbing and observing (P&O) with variable step size technique. The AC loads in the hybrid PV/wind/battery system are fed by a three-phase voltage source inverter (VSI). The space vector pulse width modulation (SVPWM) control with an optimized PI controllers is used to regulate the AC voltage of the load with a fixed frequency. The PI gains are done using PSO and HBA technique. The proposed system is used to feed the chosen location, which is a Regal Heights in El Alamein, Egypt. The control system in the two-level voltage source converter uses two control loops: an external control loop which regulates DC link voltage and an internal control loop which regulates active and reactive current components, in the grid-connected solar PV/wind system. The performance of the proposed system is studied using Matlab/Simulink software package and hybrid optimization of multiple energy resources (HOMER) programs. |