الفهرس 
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Abstract
ABSTRACT
The rapid increase in demand of electricity requires a good and reliable supply of energy. Consequently, the concept of distributed generation (DG), especially solar or PV system is used to generate localized power nearer to the industrial load center as the power consumption of factories is always in phase with solar radiation. Unfortunately, the industrial network includes highly varying nonlinear loads such as electric arc furnaces, large variable frequency drives (VFD), heavy rectifiers, etc. These nonlinear loads inject harmonic currents into the distribution network which cause power quality problems.
The main aim of this thesis is to deal with harmonic currents. As these harmonics can lead to a malfunction of the protection devices, such as relays and fuses. Moreover, harmonics always cause overheating of transformers, cables, motors, generators, and capacitors connected to the industrial network.
In this thesis, the harmonic analysis of the grid current is done using MATLAB/SIMULINK to simulate the grid-connected PV system with different nonlinear loads connected to it without using any filter. Fourier analysis was applied to calculate the total harmonic distortion (THD) of the grid current.
Also, this thesis is proposing a new approach for harmonics suppression that is developed using the grid-connected photovoltaic model on the Simulink. The PV system’s voltage source converter (VSC) was used as an active power filter (APF) to feed the grid with a predetermined amount of active power as well as the appropriate orders of harmonics to compensate the harmonic currents resulting from the nonlinear loads.
The results of simulations are investigated and analyzed. Results showed that the THD of the grid current was beyond the IEEE 519-2014 standards for harmonics due to the connected nonlinear loads. The filtration technique using the PV system’s VSC controller managed to reduce both 5th and 7th harmonics orders which reduced the THD level and enhanced the power quality of the system.