Tuesday, 6 October 2020 11:00 AM ET
Presenter: Jun Wang, University of Nebraska-Lincoln, USA
Abstract: SiC-enabled high-power modular converters for medium-voltage (MV) power distribution systems in naval applications have a great potential to achieve notably higher efficiency and power density than their Si predecessors. Such revolutionary improvement is built upon the resolution of critical challenges comprising gate driving, control and sensing, EMI, high-voltage insulation, and thermal management, in a bottom-up manner from the component level to the power-cell level and finally to the converter level.
This seminar presents systematic design solutions to tackle the aforementioned challenges. Enhanced gate drivers and their power supplies, a bi-directional auxiliary power network, and synchronous distribution control systems have been proposed to address low-power-level concerns; a switching-cycle control approach for passive component reduction, a shielded laminated dc-bus, and a partial-discharge-free insulation design method have been proposed to handle high-power-level issues. The electromagnetic interference, as an ubiquitous issue involved in all the designs above, has been carefully contained and mitigated by proposed shielding and coupling minimization techniques. All the solutions have been successfully validated on converter platforms operating continuously with switching transients up to 100 V/ns.
Biography: Jun Wang (S'13-M'17) received his B.S. and M.S. degrees from Zhejiang University, Hangzhou, China, in 2007 and 2010, respectively; Ph.D. degree from Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA, USA, in 2017, all in Electrical Engineering.
From 2010 to 2012, Dr. Wang was with GE Power Conversion, Shanghai, on design, integration, and testing of medium-voltage tens-of-megawatt variable-frequency drives and grid-interfaced converters. From 2018 to 2020, he stayed at the Bradley Department of Electrical and Computer Engineering and the Center for Power Electronics Systems (CPES), Virginia Tech, as a Research Assistant Professor. In August 2020, he joined the Department of Electrical and Computer Engineering at the University of Nebraska-Lincoln (UNL) as an Assistant Professor. His research interests include modeling, control, and design of SiC-based medium-voltage modular power conversion systems for grid and transportation applications.
Wednesday, 28 October 2020 8:00 AM ET
Presenter: Wei Xu, Huazhong University of Science and Technology (HUST), China
Abstract: The seminar aims to share the advancements in the linear induction machine topologies, integrated modeling, multi-objective optimization techniques, and high-performance control strategies applied in transportation, such as linear metro, low-speed maglev, and so on. Researchers and engineers from electrical, mechanical, and information fields may find it useful when dealing with transportation motor and drive related design, optimization and control development, etc., which can be extended to other industrial applications.
Biography: Wei Xu (M’09-SM’13) One Full Professor with Huazhong University of Science and Technology (HUST), China. His research topics focus on design and control of linear machines and drive systems. He made Postdoctoral Fellow with UTS, Vice-Chancellor Fellow with RMIT, JSPS Invitation Fellow with Meiji Univ. during 2008-2013, respectively. He has 100+ papers accepted or published in IEEE Transactions Journals, three books published by Springer or China Machine Press, and 130+ Invention Patents granted or pending. He is a Fellow of the Institute of Engineering and Technology (IET), Chapter Chair for IEEE IES Wuhan Chapter, and Associate Editor for 6 IEEE Journals, and will serve as General Chair for LDIA 2021 and PRECEDE 2023, Wuhan, China, respectively.
Tuesday, 17 November 2020 10:00 AM ET
Presenter: Saeed Peyghami, Aalborg University, Denmark
Abstract: Electric power system modernization is essential for reliable and secure power delivery with low to zero carbon footprint. It requires deploying new technologies and infrastructure as well as deregulating the electricity sector. Some stablished technologies have a considerable role in power systems modernization including renewable energy resources, storages, electronic transmission and distribution systems, and e-mobility. Notably, power electronics plays an underpinning role in energy conversion process of aforementioned technologies. Particularly, moving toward one hundred percent renewable energies has intensified the importance of power electronics in future power systems. However, power converters are one of the frequent sources of failures in many applications, hence introducing high downtime and maintenance costs. This talk will cover advanced reliability modeling and enhancement techniques in modern power electronic based power systems from device level up to system level.
Biography: Saeed Peyghami (Member, IEEE) received the B.Sc., M.Sc., and Ph.D. degrees in electrical power engineering from the Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran, in 2010, 2012, and 2017, respectively. From 2015 to 2016, he was a Visiting Ph.D. Scholar with the Department of Energy Technology, Aalborg University, Aalborg, Denmark, where he is currently a Postdoctoral Researcher. In 2019, he was a Visiting Postdoc Researcher with Intelligent Electric Power Grids, Delft University of Technology, Delft, The Netherlands. His research interests include reliability, control, and stability of power electronic-based power systems, and renewable energies.
Tuesday, 1 December 2020 11:00 AM ET
Presenter: Prof. Dorin Neacsu, Technical University of Iasi, Romania
Abstract: This webinar is presenting new advances on the deployment of digital control systems based on state-space feedback control (also referred to as "modern control") to power converters. The State Space-based modelling allows the implementation of both feedback control and additional features due to its inherent time-domain character. The presentation reviews briefly the typical design steps for a State Space-based controller, including state-space modeling, averaging, optimal selection of pole location for feedback control, reference introduction into the state-space form, and use of both an integrator and feed-forward components for achievement of dynamic and steady-state performance. This introduction is followed through with comments related to digital implementation, which make a difference between fixed-point and floating-point computing platforms. Since the performance is influenced by the operation point considered in the model, a method for adaptive gain change is next discussed. The last part of the webinar concerns design of full- and reduced-order state estimation, including observer's pole selection, equations, and offline parameters for implementation. Applications of such observers to both current sensor-less control and fault detection (either catastrophic faults or slow deterioration due to aging) are included as ultimate proceedings. The webinar benefits from support with MATLAB® analysis and a Microchip® platform implementation.
Biography: Dorin Neacsu has broad experience in application of advanced power electronics concepts in industry coming from a 30-years career alternating academic and industrial R&D positions. Professor Dorin O. Neacșu has received the MSc and PhD degrees in Electronics from the Technical University of Iasi, Romania, in 1988 and 1994, respectively, and a MSc degree in Engineering Management from Gordon Institute for Leadership, Tufts University, in 2005. Dorin has been involved with the Department of Electronics, Technical University of Iasi, Romania, between 1990 and 1999. During this time, Dorin held visiting positions at Universite du Quebec a Trois Rivieres, Canada, and General Motors/Delphi, Indianapolis, USA. Following 1999, he was involved with the US industry as an Electrical Engineer, Consultant, Product Manager, and Project Manager, and with U.S. academic activities at the University of New Orleans, Massachusetts Institute of Technology, and United Technologies Research Center. Since 2012, Dorin is an Associate Professor with Technical University of Iasi, Romania and was a repeat Visiting Associate Professor with Northeastern University, Boston, MA, USA. He has maintained a continuous stream of publications since 1992 and has published several books, most noticeably “Switching Power Converters – Medium and High Power”, (Press/Taylor and Francis, editions in 2006, 2013, and 2017), “Telecom Power Systems” (CRC Press/Taylor and Francis, 2017), and “Automotive Power Systems” (CRC Press/Taylor and Francis, 2020). Dorin is an Associate Editor of IEEE Transactions on Power Electronics and Associate Editor of IEEE IES Magazine.