Design and analysis of modern three-phase AC/AC power converters for AC drives and utility interface

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Title: Design and analysis of modern three-phase AC/AC power converters for AC drives and utility interface
Author: Kwak, Sangshin
Abstract: Significant advances in modern ac /ac power converter technologies and demands of industries have reached beyond standard ac /ac power converters with voltage -source inverters fed from diode rectifiers . Power electronics converters have been matured to stages toward compact realization , increased high -power handling capability , and improving utility interface . Modern ac /ac power converter topologies with various control strategies have been introduced for the further improvements , such as matrix converters , current -fed converters , PWM rectifiers , and active power filters . In this dissertation , several new converter topologies are proposed in conjunction with developed control schemes based on the modern ac /ac converters which enhance performance and solve the drawbacks of conventional converters . In this study , a new fault -tolerant PWM strategy is first proposed for matrix converters . The added fault -tolerant scheme would strengthen the matrix converter technology for aerospace and military applications . A modulation strategy is developed to reshape output currents for continuous operation , against fault occurrence in matrix converter drives . This study designs a hybrid , high -performance ac /ac power converter for high power applications , based on a high -power load commutated inverter and a mediumpower voltage source inverter . Natural commutation of the load commutated inverter is actively controlled by the voltage source inverter . In addition , the developed hybrid system ensures sinusoidal output current /voltage waveforms and fast dynamic response in high power areas . A new topology and control scheme for a six -step current source inverter is proposed . The proposed topology utilizes a small voltage source inverter , to turn off main thyristor switches , transfer reactive load energy , and limit peak voltages across loads . The proposed topology maximizes benefits of the constituent converters : highpower handling capability of large thyristor -based current source inverters as well as fast and easy control of small voltage source inverters . This study analyzes , compares , and evaluates two topologies for unity power factor and multiple ac /ac power conversions . Theoretical analyses and comparisons of the two topologies , grounded on mathematical approaches , are presented from the standpoint of converter kVA ratings , dc -link voltage requirements , switch ratings , semiconductor losses , and reactive component sizes . Analysis , simulation , and experimental results are detailed for each proposed topology .
URI: http : / /hdl .handle .net /1969 .1 /2336
Date: 2005-08-29

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Design and analysis of modern three-phase AC/AC power converters for AC drives and utility interface. Available electronically from http : / /hdl .handle .net /1969 .1 /2336 .

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