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Dr. Yunting Liu, University of Tennessee, will present the CURENT Power and Energy Seminar on Fri., Sept. 20. 

Dr. Yunting Liu, University of Tennessee, will present the CURENT Power and Energy Seminar on Fri., Sept. 20. The seminar will be held from 12:20 pm to 1:10 pm in MHK 404.  

Presenter: Dr. Yunting Liu, Post-Doctoral Research Associate, University of Tennessee

Time: Friday, September 20th, 12:20 PM - 1:10 PM EST

Location: Min H. Kao Building, Room 404

This seminar will be available through ZOOM.  See info near bottom of this email.

See the CURENT calendar for more news and seminars. 

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Presenter: Dr. Yunting Liu, Post-Doctoral Research Associate, University of Tennessee

Title: A Modular Multilevel Converter with Self Voltage Balancing and a Real DC Capacitor-Less Solid-State Variable Capacitor

Abstract: 

Abstract: This week's seminar will be two-fold: 1) A Modular Multilevel Converter with Self Voltage Balancing and 2) A Real DC Capacitor-Less Solid-State Variable Capacitor.

  1. Conventionally, the modular multilevel converter (MMC) is deemed to have no inherit voltage balancing property without voltage monitoring and control. This presentation will mathematically demonstrate that MMC capacitor voltage is self-balanced by nature if considering certain sub-module patterns. Upon the math proof, a novel modulation, namely Y-Matrix Modulation (YMM), is proposed to transform the math analysis into modulation practice. With the proposed YMM, MMCs are secured self voltage balancing. Several YMM based MMC case studies are provided for verification purposes.
  2. H-bridge based single-phase applications have second-order harmonics on the dc-bus voltage. Conventionally, the second-order harmonics are filtered by bulky dc capacitors to maintain the constant dc-bus voltage, which results in low power density. However, in applications like solid-state variable capacitors (SSVC), the constant dc-bus voltage is unnecessary since the dc bus is disconnected from load or source. This seminar will present a real dc capacitor-less SSVC, which removes the dc capacitors from the topology by releasing the constraints on dc bus voltage fluctuation.

Bio: Dr. Yunting Liu received her B.S. degree from Huazhong University of Science and Technology, Wuhan, China, in 2013, and her PhD degree from Michigan State University, East Lansing, in 2019, all in electrical engineering.

In 2019, She joined University of Tennessee, Knoxville, as Post-Doctoral Research Associate. Her research interests include solid-state variable capacitor, modular multilevel converter, and dual-active-bridge dc-dc converter.

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Zoom Information:

Join from PC, Mac, Linux, iOS or Android: https://tennessee.zoom.us/j/608630490

Or iPhone one-tap (US Toll): +16468769923,608630490# or +16699006833,608630490#

Or Telephone: Dial: +1 646 876 9923 (US Toll) +1 669 900 6833 (US Toll) Meeting ID: 608 630 490

International numbers available: https://zoom.us/u/aFK5Bq5SR

Or an H.323/SIP room system: H.323: 162.255.37.11 (US West) or 162.255.36.11 (US East) Meeting ID: 608 630 490  

SIP: 608630490@zoomcrc.com 

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Upcoming Seminars

Friday, September 27th - Dr. Aminul Huque, ORNL

Friday, October 4th - Dr. Xueping Li, University of Tennessee

Friday, October 11th - Dr.  Suman Debnath, ORNL

See the CURENT calendar for more news and seminars