Conservative Power Theory and Cooperative Control of Distributed Power Converters
(Danilo I. Brandao, Elisabetta Tedeschi, Tommaso Caldognetto)

Pervasive proliferation of non-linear and time-varying loads and distributed generation make the power system operate under conditions that are substantially different from traditional sinusoidal ones. This calls for advanced compensation equipment and coordinated operation to improve power quality and efficient use of distributed resources. Power electronics is the best candidate solution, provided that the use of any device is based on a proper understanding of the complexity of the new scenario. The aim of this tutorial is to provide a theoretical background to correctly approach the problem of reactive, harmonic and unbalance compensation, in the context of the multifunctional grid-tied power converters and their cooperative operation. The control schemes are devised in natural abc-reference frame, and the control strategies are based on the conservative power theory. This tutorial goes from the conservative power theory describing its power and current decomposition in decoupled terms; then it passes through the selective control strategies for shunt active power filter and multifunctional distributed energy resources; and finally it ends with the coordination of distributed power converters in low-voltage microgrid models, given some illustrative examples based on the power-based control, and its progressive evolution to the local area energy networks (E-LANs).

Danilo I. Brandao

Danilo I. Brandao (S’14-M’16) received the M.Sc. degree and the Dr. degree in Electrical Engineering from Univ. Estadual Paulista and University of Campinas, Brazil, in 2013 and 2015, respectively. He was a visiting scholar at Colorado School of Mines, USA, in 2009 and in 2013, and at University of Padova, Italy, in 2014. He is currently an assistant professor at Federal University of Minas Gerais with the Department of Electrical Engineering (DEE) and with the Graduate Program in Electrical Engineering (PPGEE). His main research interests are control of grid-tied converters, power quality, power theories and microgrid. Mr. Brandao is a member of the Brazilian Power Electronics Society and IEEE.

Elisabetta Tedeschi

Elisabetta Tedeschi received the M.Sc. degree (with honors) in electrical engineering and the Ph.D. degree in industrial engineering from the University of Padova, Italy, in 2005 and 2009, respectively, working on cooperative control of compensation systems. From 2009 to 2011, she was a post doc researcher at the Norwegian University of Science and Technology (NTNU), working on the design and control of energy conversion systems for the grid integration of offshore renewable energies. Having received a Marie Curie Fellowship, she was a Researcher at Tecnalia, Spain, from 2011 to 2013, where she worked as a principal investigator in the Sea2grid Project, related to the storage needs for the grid integration of wave energy converters. From 2013 to 2014, she was Research Scientist at SINTEF Energy and Adjunct Associate Professor at NTNU. In 2014, she became Full Professor within offshore grid at NTNU. She has a core competence in the design and control of energy conversion and transmission systems, with focus on offshore energy, and power-quality issues. She has led and/or contributed to more than 15 national and international scientific projects and she is the author or co-author of 2 book chapters and more than 20 journals and 60 conference papers in the field of design and control of energy converters and offshore applications.

Tommaso Caldognetto

Tommaso Caldognetto (S’10-M’16) received the M.S. (Hons.) degree in electronic engineering and the Ph.D. degree in information engineering from the University of Padova, Italy, in 2012 and 2016, respectively. In 2014, he was a visiting Ph.D. student with the Institute for Automation of Complex Power Systems, University of Aachen, Germany. He is currently a researcher with the Department of Technology and Management, University of Padova. His research interests include control of grid-tied converters, microgrid architectures, and real-time simulation for power electronics.


Silicon Based MV Power Converter Fundamentals and their Applicability to HV Silicon-carbide Semiconductors
(Geraldo Nojima, Marcelo Lobo Heldwein)

Tutorial Abstract: Waiting content

Geraldo Nojima

Geraldo Nojima was born in Brazil and did his engineering studies in Brazil and in Switzerland. He has over 38 years of experience working in Brazil, Switzerland and the United States researching and developing DC and AC power conversion equipment and controls for low and medium voltage applications having been granted multiple patents in the USA and internationally. His professional experience includes teaching technical classes, doing marketing research, new product introduction and field service in 19 countries. Geraldo has been with Eaton Corporation for the past 17 years and is currently the chief technologist in Avery Creek, North Carolina, researching and developing Medium Voltage AC drives, EV DC Quick Chargers, HVDC converters and MV static protection devices. Was elected the Eaton 2008 Engineer of the Year for the Electrical Sector Americas for contributions in power conversion and controls engineering. Presently one of the responsible researchers of medium voltage Static Circuit Breakers from 12kV to 75kV, SiC based Solid State Transformers, Medium Voltage Drives up to 15kV and >60kV DC power transmission and distribution system. Prior to joining Eaton, Geraldo was the R&D Director for SMC Electrical Products, USA; R&D Project Manager for Nordson Corporation, USA; Principal Engineer for Reliance Electric USA – now Rockwell; R&D Project Manager for Reliance Electric Dierikon, Switzerland and R&D Manager for Reliance Electric in Sao Paulo, Brazil.

Marcelo Lobo Heldwein

Marcelo Lobo Heldwein received the bachelor and master degrees in electrical engineering from the Federal University of Santa Catarina (UFSC), Brazil, in 1997 and 1999, respectively, and his Ph.D. degree from the Swiss Federal Institute of Technology (ETH Zurich), Switzerland, in 2007. He is currently an Associate Professor with the Department of Electronics and Electrical Engineering at the UFSC and a co-leader of the Power Electronics Institute (INEP). From 1999 to 2003, he worked with industry, including research at the Power Electronics Institute, Brazil and Emerson Network Power, in Brazil and Sweden. He was a Postdoctoral Fellow at the ETH Zurich and at the UFSC from 2007 to 2009. He has published more than 140 peer reviewed papers, has coauthored two books and filled 6 patents. He has coauthored four papers that received Best Paper Awards from IEEE Power Electronics Society and IEEE Industrial Electronics Society and two innovation prizes from the Brazilian industry. He has coordinated several projects with the Brazilian industry in the areas of Power Electronics, Advanced Power Distribution and Electromagnetic Compatibility for Power Electronics. Dr. Heldwein is a senior member of the IEEE and of the Brazilian Power Electronic Society (SOBRAEP), where he serves the Brazilian Power Electronics Journal as an associated editor. He is also a member of the Advisory Board of PCIM Europe and an Associated Editor of the IET The Journal of Engineering.

Short-course on photovoltaic (PV) technology
(Marcelo Gradella Villalva)

Recent advances on PV cells and modules Modeling of PV modules under homogeneous and partial shading conditions Analysis of the I-V curve, shading effects, bypass diodes and hotspots Problems and defects, testing and certification of PV modules Measurement of solar irradiation and evaluation of the energy potential Modeling and simulation of PV systems, energy yield and performance ratio Enhancement of energy yield with tracking systems Part II Maximum power point tracking (MPPT) and anti-islanding algorithms Power electronic converters for grid-connected PV systems Module-level power electronics (MLPE): microinverters and optimizers Testing and certification of grid-connected power inverters.

Marcelo Gradella Villalva

Marcelo Gradella Villalva holds BSc, MSc and PhD degrees in Electrical Engineering. His research interests are power electronics and photovoltaic systems. He is the head of the Laboratory of Energy and Photovoltaic Sytems at FEEC (School of Electrical and Computer Engineering) at UNICAMP (University of Campinas). He currently advises a team of more than 20 grad and undergrad students, developing researches on grid-tie power converters, optimizers, microinverters, MPPT algorithms, anti-islanding detection, measurement and transposition of solar radiation, solar trackers, microgrids, analysis and evaluation of PV modules, tracing and analysis of IV curves, inspection and evaluation of PV farms, and other subjects.

Tutorial 1: Smart Power Electronics Battery Energy Management Solutions for Electric Transportation
(Sheldon S. Williamson)

Tutorial 2: Power Electronics Opportunities and Challenges for Plugged and Wireless Fast Charging of Autonomous E-transport and Mobility
(Sheldon S. Williamson)

-Tutorial #1: Smart Power Electronics Battery Energy Management Solutions for Electric Transportation

More recently, the trend in the auto industry is to move towards electric modes of transport as well as autonomous e-mobility (self-powered cars and urban mass mobility). Hence, it has become imperative to find a solution, to manage energy production and usage accurately, especially within the context of future electric energy storage systems. Enhancing the life of Lithium-ion (Li-ion) battery packs has been the topic of much interest in the auto industry. In this framework, the role of on-board cell voltage balancing of Li-ion batteries will be highlighted in this talk. This is a very important topic in the context of battery energy storage cost and life/state-of-charge, SOC/state-of-health, and SOH monitoring. Li-ion batteries provide a reasonable solution for e-transport; however, the main issues include: Cycle life (range anxiety), calendar life, energy density, power density, and safety. These issues can be addressed effectively by using a simple practical approach: a power electronics based dynamic cell voltage equalizer. The design and implementation of a novel, reduced-parts DC/DC converters for battery cell-voltage-equalization will be discussed. The design, implementation, and testing/validation of the active cell-balancing DC/DC converter topology will be presented.

-Tutorial #2: Power Electronics Opportunities and Challenges for Plugged and Wireless Fast Charging of Autonomous E-transport and Mobility

This presentation will review presently available DC fast charging systems, followed by a brief description and evaluation of DC fast-charging infrastructure. Different power converter topologies and viable configurations will be presented, compared, and evaluated. These topologies will be compared based on their power levels, efficiency, cost, and specifications. The talk will introduce for the first time the possibility of employing a 3-phase, 3-switch (TPTS) converter as a single-stage charger for DC fast charging. A new modulation technique for controlling a TPTS converter will also be introduced. Experimental verification and test results of the designed converter/charger prototype will be presented. This presentation will also introduce both home and public charging interface designs from a power electronic intensive solution perspective. Several grid-connected as well as PV/grid interface topologies for EV charging will be presented, with detailed comparative points highlighted. The modeling, sizing, design, and implementation of a novel high-efficiency, single-stage PV/grid/EV charging infrastructure will be presented. The novel charging infrastructure is universal and smart in nature, whereby EV batteries of different chemistries as well as charging rates can be accommodated in a single power conversion stage. The designed charging infrastructure will support both Level 1 as well as Level 2 DC charging. This is a new concept for charging EVs. This is critical, due to the inevitable penetration of renewable energy sources, which are inherently DC in nature. According to SAE J1772 standards, DC charging of EVs can be performed at 200-450 V DC, 36.0 kW, and 80 A (DC Level 1), and up to 200 A, 90 kW (DC Level 2). On the other hand, in the last 5 years or so, power supply and charger manufacturing companies have been seriously started looking at wireless charging as an attractive solution, to avoid physical drawbacks of wired or plugged versions of charging. The high-level goals of this talk is to focus on introducing advanced power electronics solutions for rapid charging using

Sheldon S. Williamson

Sheldon S. Williamson received his Bachelors of Engineering (B.E.) degree in Electrical Engineering with high distinction from University of Mumbai, Mumbai, India, in 1999. He received the Masters of Science (M.S.) degree in 2002, and the Doctor of Philosophy (Ph.D.) degree (with Honors) in 2006, both in Electrical Engineering, from the Illinois Institute of Technology, Chicago, IL, specializing in automotive power electronics and motor drives, at the Grainger Power Electronics and Motor Drives Laboratory. From June 2006 to May 2011, Dr. Williamson held a Tenure-track Assistant Professor position in the Department of Electrical and Computer Engineering, at Concordia University, in Montreal, Canada. Also, from June 2011 to June 2014, Dr. Williamson held a tenured Associate Professor position at Concordia University. Currently, Dr. Williamson is a Professor at the Smart Transportation Electrification and Energy Research (STEER) group, within the Department of Electrical, Computer, and Software Engineering, at the University of Ontario-Institute of Technology (UOIT), in Oshawa, Ontario, Canada. He also holds the prestigious NSERC Canada Research Chair position in Electric Energy Storage Systems for Transportation Electrification. His main research interests include advanced power electronics and motor drives for transportation electrification, electric energy storage systems, and electric propulsion.

Advances in Wireless Power Transfer Technologies for EV charging
(Udaya K. Madawala and Grant A. Covic)

Electric vehicles (EVs) are becoming increasingly popular as the means of future transport. EVs can be charged either from the grid or standalone renewable sources using both wired and wireless technologies. The wireless solution, based primarily on inductive power transfer (IPT) technology, is more attractive and suitable for both stationary and dynamic charging of EVs. This tutorial discusses the challenges and future directions of both uni and bi-directional wireless power transfer (WPT) technologies as needed to meet recommend practice for standards under development , and presents the latest advances in WPT technology in relation to stationary and dynamic EV charging and V2G applications.

Udaya K. Madawala

Udaya K. Madawala graduated with a B.Sc. (Electrical Engineering) (Hons) degree from The University of Moratuwa, Sri Lanka in 1987, and received his PhD (Power Electronics) from The University of Auckland, New Zealand in 1993 as a Commonwealth Doctoral Scholar. At the completion of his PhD, he was employed by Fisher & Paykel Ltd, New Zealand, and in 1997 he joined the Department of Electrical and Computer Engineering at The University of Auckland where he currently, as a Full Professor, focuses on a number of power electronics projects related to wireless grid integration of EVs for V2G applications and renewable energy. Udaya is a Fellow of the IEEE and a Distinguished Lecturer of the IEEE Power Electronic Society, and has served both the IEEE Power Electronics and Industrial Electronics Societies in numerous roles, relating to conferences, technical committees and chapter activities. Currently, Udaya is an Associate Editor for IEEE Transactions on Industrial Electronics and IEEE Transactions on Power Electronics, and the Chair (Elect) of IEEE SPEC Steering Committee and the Oceania Liaison Chair of Membership Development Committee of the IEEE Power Electronics Society.

Grant A. Covic

Grant A. Covic is a full professor at the University of Auckland. In the mid 90’s he began working with Prof. John Boys to develop the technology of resonant Inductive (contact-less) Power Transfer (IPT) for materials handling and electric vehicles (EVs) and in the early 2000’s they focused on AGV applications for traditional markets, and redeveloping EV charging solutions for private as well as public applications. Today he focuses on industrial solutions using IPT and wireless charging of EVs under static and dynamic conditions. He co-founded (with John) “HaloIPT” which focused on electric vehicle (EV) wireless charging infrastructure and was joint head of research from formation until sale. Grant is a Senior Member of IEEE, a Fellow of both Engineering New Zealand, and the Royal Society of New Zealand and a Distinguished Lecturer for the IEEE Transportation Electrification Community. He was awarded the New Zealand Prime Minister’s Science Prize, the Vice Chancellors commercialisation medal and the KiwiNet research commercialisation awards for scientific research which has seen outstanding commercial success. Presently he heads inductive power research at the UoA and co-leads the interoperability sub-team within the SAE J2954 wireless charging standard for EVs.