6340

6340

تحليل و شبيه سازي فيلترهاي سري و موازي به منظور بهبود مشخصه هاي شبكه و مصرف كننده باحضور بارهاي غيرخطي صنعتي

كارشناسي ارشد

برق

دكتر عباس شولايي

Abstract In this thesis passive circuits and filters in parallel and series configuration has been investigated. Analysis and simulations has been done in order to improve power quality characteristics of power supply and consumer with the presence of non-linear industrial loads. The concept and characteristics of electrical power quality such as Total Harmonic Distortion (THD), three-phase Unbalance and Power Factor (PF) has been studied and evaluated. The orthogonal decomposition of power and current in threephase system at non-sinusoidal condition has been studied. Then the conventional harmonic filters and their formulations has been evaluated and design methods for those filters presented. One of the purposes of this thesis was cost based design of harmonic filters. In order to solve this problem with its constraints, the genetic algorithm named CBGA has been used. In order to reduce load voltage and supply current unbalance in asymmetrical three-phase system a compensation method by using passive BaCo circuits has been analyzed and simulated. In addition in order to improve performance of these compensators with presence of zero-sequence current, a corrective technique has been investigated. Also by using harmonic filters instead of BaCo circuits in order to simultaneously improve THD, voltage Unbalance and Power Factor has been presented. The modeling and simulation of Electromagnetic Filter for elimination of zerosequence harmonics beside production and compensation of one phase outage in three-phase power supply has been implemented. Finally, by implementing and recording of experiment results, the performance of electromagnetic filter has been compared with simulation results.