Toward high-efficiency high power density single-phase DC-AC and AC-DC power conversion - architecture, topology and control

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Electrical & Computer Engr

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2017

Author dc:creator

• Qin, Shibin

Contributors dc:contributor

• Pilawa-Podgurski, Robert C. N.
• Krein, Philip T.
• Haran, Kiruba S.
• Hanumolu, Pavan K.

• AC-DC
• DC-AC
• Inverter
• Rectifier
• Power pulsation buffer
• Mutilevel converter
• Power factor correction
• Active filter
• Converter control
• Series-stacked buffer

Statement dc:rights

• Copyright 2017 Shibin Qin

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/97748

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/97748