الفهرس 
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Abstract
Distribution Generation (DG) aims at integrating different power plants to provide additional power quality benefits and increase the reliability. Power electronics are commonly used for interfacing these distributed generation units to the electrical network. This thesis presents different solutions regarding power quality enhancement when integrating distributed generation units to utility takes place. The thesis deals with a single-phase interface inverter of distributed generation systems requiring power quality features, such as harmonic mitigation and reactive power compensation for grid connected operation. The main objective of this thesis is to integrate the distributed generation interface inverter with shunt/series active power filter capabilities for power quality enhancement. With the proposed technique, the inverter controls the active power flow from the renewable energy source to the grid and also performs the non-linear load current harmonic mitigation keeping the grid current almost sinusoidal. The control scheme utilizes a current reference generator based on Sinusoidal Signal Integrator (SSI) and Instantaneous Reactive Power (IRP) theory together with a repetitive current controller. Employing series APF capabilities provides additional advantage than shunt APF which is mitigating the supply voltage harmonics under distorted supply voltage condition. MATLAB modeling and simulation analysis results obtained via a 4 kVA inverter model to demonstrate the feasibility of the proposed solution.