الفهرس 
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Abstract
With the advancement of technology and need for using electrical drives in industries the demanded power is increasing rapidly. A lot of electrical equipment requires a certain power quality continuously for their operation as any change may cause malfunctioning of the equipment of destroy it. However, the quality of power delivered to customers is affected by various external and internal factors such as voltage, current, frequency variations, faults, outages etc. The main reason for most of power quality problems is the presence of current harmonics. Current harmonics leads to overheating the equipment, breaking its insulation and etc.To enhance the quality of the power delivered to the consumer‟s equipment current harmonics should be mitigated. To overcome current harmonics power filters are used. For this purpose many filters topologies and compensation techniques were presented.Two level converters have drawbacks regarding their use as power injector in high power filters such as the voltage stress. So, multilevel converters were presented as a feasible solution as they can withstand any power ratings due to their scalability. In this thesis a hybrid power filter based on modular multilevel convert is proposed. The hybrid power filter consists of shunt connected active power filter in series with a single tuned passive power filter. The used power injector for the hybrid power filter is modular multilevel converter which increases the system reliability and scalability to any high power level.The hybrid power filter uses instantaneous p-q theory for extracting harmonics while the modular multilevel converter uses phase shifted pulse width modulation for generating the carriers signal and for achieving balance between the voltages of submodules capacitors. The proposed system mitigates the nonlinear load current harmonics to meet the standards levels. The proposed control strategy is simulated in MATLAB/SIMULINK and the results are presented.