الفهرس 
INTRODUCTION AND REVIEW OF THE PREVIOUS WORKOnly 14 pages are availabe for public view
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Abstract
The use of AC/DC converters in modern power system has been increasing every year.dc transmission is one of the most important application of AC/DC converters.dc transmission is needed when the transmission distance is sufficiently large or to keep the interconnected ac systems operating in perfect synchronism. AC/DCconverters generate harmonics that affect voltage and current waveforms both on their input and output sides. the interactions between AC/DC converters and power system have always presented problems.many research papers on the impact of harmonics generted by the AC/DC converters have bn presented .harmoniics generted by AC/DC converters are dependent on the conditions under which they are operating. this thesis presents an analysis for the performance of AC/DCconverters, with six and twelve-pulses, operating with pure,distorted and unbalanced input voltage wave forms taking into consideration the different AC and D DC side parameters which could affect the converter operation. two methods have been applied to simulate the AC/DC converters to show the effect of harmonic distortion and unbalance of input voltage on its performance. these are symmetrical components and direct phase quantities methods. the latter enables the explicit inclusion ar elements in the analysis