الفهرس 
Design of Three Level Inverter Using PWM.
Selection of DC-link CapacitorOnly 14 pages are availabe for public view
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Abstract
Because of the low harmonic distortion content and reduced
voltage stress in switching devices, Multi-level Inverter (MLI) is of
particular interest. The topologies of MLIs and modulation approaches are
discussed elaborately. The inverter is evaluated using selective harmonic
elimination (SHE) modulation.
The marine predator algorithm (MPA) is proposed for solving
transcendental nonlinear equations in a selective harmonic elimination
technique using an MLI. It proved its suitability and supremacy over the
other selective harmonic (SHE) techniques used in recent research as it
has good precision, high probability of convergence, and improving
quality of output voltage. The optimum values of switching angles from
MPA are applied to control a three phase 11-level MLI using cascaded H-
bridge (CHB) topology to control the fundamental component and cancel
the low order harmonics for all values of modulation index from 0 to 1.
Analytical and simulation results demonstrate the robustness and
consistency of the technique through the MATLAB simulation platform.
The results obtained from simulation show that the MPA algorithm is
more efficient and accurate than other algorithms such as teaching-
learning-based optimization (TLBO), flower pollination algorithm (FPA),
and hybrid particle swarm optimization with gray wolf optimization
(PSOGWO). A prototype for a three-phase seven-level cascaded H-bridge
inverter (7L-MLI-CHB) experimental setup is carried out. The output of
this experimental test validated and supported the results obtained from
the simulation analysis.
The model of power loss of three phase 7L-MLI-CHB using the
silicon metal-oxide-semiconductor field-effect transistor (MOSFET) is
obtained according to the modulation technique. Conduction and
switching losses are calculated based on the experimental manufacturer
data from the Si-MOSFET using the thermal model of Piecewise Linear
Electrical Circuit Simulation (PLECS). Losses and output power are
measured at different modulation index values based on the MPA
algorithm. Finally, a design of heatsink volume is presented for this design
at different temperatures.
This thesis also includes a performance review of WBG
semiconductor devices in the MLI. As a result, a contrast between WBG,
Si-IGBT and silicon devices is made, and the power quality of the inverter
in terms of power losses and overall efficiency is investigated.
A complete model of total power losses in inverter is presented
and simulated based on manufacturing models. The operation of the
inverter is simulated using different types of switching power devices.
This thesis also provides a complete analysis of photovoltaic (PV)
inverter of 3kW output power by merging the design of PV array and DC-
AC inverter; The design includes a PV module to configure a large array
that agrees with the inverter power output, the DC-DC step-up (boost)
converter, next the full-bridge using MOSFET switches controlled by
Pulse Width Modulation(PWM) is used to generate three levels signal and
the output LCL filter design, then to the load. Also studying the inverter
parameters that affect the losses and inverter efficiency. The design is