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Title:Toward high-efficiency high power density single-phase DC-AC and AC-DC power conversion - architecture, topology and control
Author(s):Qin, Shibin
Director of Research:Pilawa-Podgurski, Robert C. N.
Doctoral Committee Chair(s):Pilawa-Podgurski, Robert C. N.
Doctoral Committee Member(s):Krein, Philip T.; Haran, Kiruba S.; Hanumolu, Pavan K.
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):AC-DC
DC-AC
inverter
rectifier
power pulsation buffer
mutilevel converter
power factor correction
active filter
converter control
series-stacked buffer
Abstract:Power conversion between the single-phase AC grid and DC sources or loads plays an indispensable role in modern electrical energy system for both generation and consumption. The renewable resources and electrical energy storage are integrated to the grid through inverters. Telecoms, data centers and the rest of the digital world is powered by the grid through rectifiers. Existing and emerging applications all demand the DC-AC and AC-DC systems to be not only more efficient to reduce energy consumption, but also more compact to reduce cost and improve portability. Therefore, new AC-DC and DC-AC converter designs that improve the efficiency and power density of the system is a critical area of research and is the focus of this dissertation. The recent development of wide band-gap devices stimulates a new round of improvement on efficiency and power density of AC-DC converters. However, despite the new transistors used, the fundamental system architecture and topology remain relatively unchanged, which is becoming the bottleneck for further improvement. This dissertation explores new architecture, topology and control to overcome this bottleneck, targeting an order-of-magnitude improvement on power density and comparable efficiency to the conventional design. The proposed solutions build on two key innovations: the series-stacked buffer architecture for twice-line-frequency power pulsation decoupling in single-phase AC-DC and DC-AC conversion, and the flying capacitor multilevel topology for power transfer and waveform conversion between AC and DC. This work provides complete solutions for these ideas, including the theoretical development, design procedure, control method, hardware implementation and experimental characterization.
Issue Date:2017-04-20
Type:Thesis
URI:http://hdl.handle.net/2142/97748
Rights Information:Copyright 2017 Shibin Qin
Date Available in IDEALS:2017-08-10
Date Deposited:2017-05


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