الفهرس 
IntroductionOnly 14 pages are availabe for public view
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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.