4039

3816

كارشناسي ارشد

قدرت

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1386

نه، 97، [II] ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

حميدرضا كارشناس

حسين فرزانه فرد

18/04/87

مهندسي برق و كامپيوتر

ID3816

به فارسي و انگليسي: قابل رؤيت در نسخه ديجيتال

Abstract ac ac converters are widely used in industries These converters are mostly in the formof indirect ac dc ac converter with a dc link The filters associated with this link makethe converter bulkier and less reliable The advent of new power semiconductorswitches along with the availability of powerful digital controllers has led to theappearance of new direct ac ac converters Direct ac ac converters also known asMatrix converters have many advantages over indirect converters Despite that it isdifficult to handle the commutation of bidirectional switches in these converters In thisthesis a new ac ac converter without a dc link filter is proposed This converterconsists of two converters with standard semiconductor switches thus eliminating thecommutation problems of bidirectional switches On the other hand the lack of dc linkfilter makes the switching pattern of two converters dependable Therefore theswitching strategy of matrix converters based on dual space vector has been exploitedto synthesize the switching pattern of proposed converter The proposed converter hassinusoidal waveform both at the input and output Further the input power factor canbe controlled Simulation results show the operation of proposed converter Experimental results obtained from a laboratory set up are in close agreement with thesimulation results and show the validity of analysis

حميدرضا كارشناس

حسين فرزانه فرد