14953

13458

كارشناسي ارشد

قدرت

اصفهان : دانشگاه صنعتي اصفهان

1398

دوازده، 107ص. : مصور، جدول، نمودار

حميدرضا كارشناس

جواد ابراهيمي

مسعود حاجيان، محمدصادق گلسرخي

1398/06/01

كتابنامه

برق

مهندسي برق و كامپيوتر

1398/06/02

2553675

Design and Implementation of a Four Level Active Rectifier with Reduced Switch Count Ali Abdelahi mail a abdelahi@ec iut ac ir Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan Iran Degree M Sc Language Farsi Supervisor Dr Hamidreza Karshenas Abstract In this thesis a new four level rectifier topology based on unidirectional switches is proposed Rectifiers are extensivelyused in industrial applications as one of the main power electronic energy conversion systems Conventional high powerrectifiers usually inject considerable low frequency harmonics to the grid Therefore the researchers have been tryingto modify the existing converter topologies or present new topologies to reduce the distortion imposed by conventionalrectifiers The multi level rectifiers are a proper solution for medium and high power applications In multi level rectifiers as the number of voltage level increases the quality of input current is improved But at the same time the number ofswitching components as well as the complexity of the system is also increased In this thesis a novel 4 level rectifiertopology is proposed with reduced number of active power switch The switching states and the operation of the proposedrectifier is studied A space vector modulation technique along with appropriate controller are implemented A properalgorithm is proposed to balance the flying capacitor voltages Using the PSIM software the simulation results are providedfor the 3L Vienna the NNPC and the proposed rectifiers with considering a specific high power medium voltage industrialapplication In comparison with the NNPC and proposed topologies the 3L Vienna has the lower number of voltage level higher blocking voltage of the switches and more limited inductor reactance The simulation results show that the NNPCand the proposed topology have the identical input voltage and current waveforms equal blocking voltage of switches andthe same efficiency The main advantage of the proposed topology is the lower number of active switches which is 9 ascompared to NNPC topology In order to verify the practicability of the proposed topology a scaled down prototype isimplemented and the associated results are presented Key Words Rectifier Four level topology Modulation DSP Flying capacitor VOC controller

حميدرضا كارشناس

جواد ابراهيمي

مسعود حاجيان، محمدصادق گلسرخي