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چكيده انگليسي :

Converter Rating Reduaction in Hybrid Active Filters Iman Aminoroaya i aminoroaya@ec iut ac ir Date of Submission 2011 11 9 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Hamidreza Karshenas karshen@cc iut ac irAbstract This thesis presents two new topologies of Hybrid Active Power Filters HAPF Advances in powersemiconductor devices on one hand and appearance of fast and sophisticated microprocessors on the otherhand have caused a fast growth in power electronic loads These loads typically have non sinusoidalwaveforms at their input terminals which result in the injection of harmonics into the grid Harmonics haveadverse effect on the network components like energy loss interference and nuisance operation ofprotective devices Power filters are one of the most common methods employed to mitigate harmonics attheir source Among different type of power filters HAPFs are composed of both passive and activeelements and are an attractive solution to mitigate harmonic pollution They are less expensive than ActivePower Filters APF and at the same time do not have the drawbacks associated with Passive Power Filters PPF Although converter rating in HAPF is smaller than that of AF the research is still underway tofurther reduce the rating of active part in a HAPF In this thesis a survey is carried out on different HAPFtopologies Simulation and theoretical analysis are presented with the focus on converter rating in differenttopologies Among various topologies proposed for HAPF the one with series combination of active andpassive elements in parallel with the load is more common HAPF type 2 This topology is used to studythe effect of passive component on HAPF performance It is shown that large values of converter s gainimprove the compensation performance almost independent of the passive filter performance alone In most studies carried out for the reduction of fundamental component in the active part of an HAPF some fundamental current still flows in the active part without any contribution in harmonic compensation This fundamental current in turn increases the current rating of the active part In this thesis two newtopologies are proposed in which the fundamental current through the active part is eliminated In firsttopology this objective is achieved by introducing another branch which generates a fundamental currentequal to the main branch By using the MMF balancing feature of a three winding transformer the equalfundamental current in two branches cancel out each other leading to zero fundamental current in thetertiary winding where the active part i e converter is connected In the second proposed topologyeliminating the fundamental current is achieved by using a parallel resonance circuit tuned at thefundamental frequency It is shown that the passive elements of fundamental resonance circuit are fairlysmaller than that of similar configuration known as injection type HAPF Theoretical analysis is presentedwhich explains the operation of proposed topologies and simulations are presented to validate theoreticalresults It is proved that both of the proposed topologies are able to eliminate the fundamental current ofconverter Different comparisons are presented to investigate the advantages and disadvantages of varioustopologies The comparison is made based on harmonic compensation performance ratings of the converterand the size of the passive elements Keywords Hybrid Active power filter Active Part Rating Passive Part Fundamental Current

امين الرعايا، ايمان

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