WORKSHOP SEMINAR  FEB. 21, 2023 (10:15-13:15) 

Emerging Technologies of Sustainable Energy Systems


Workshop Topics


1) Power Electronics and Grid Control

Dr. Deepak Divan, Georgia Institute of Technology, Atlanta, GA, USA.

2) Power Decoupling Technologies for Single-Phase Grid-Connected Inverters

Dr. Liuchen Chang, University of New Brunswick, Fredericton, NB, Canada

3) Design of Medium-Frequency Medium-Voltage Transformers

for Grid Applications

Dr. Juan Carlos Balda, University of Arkansas at Fayetteville, USA

4) Introduction to Microinverters and Multi-Port PV Converters

Dr. Issa Batarseh, University of Central Florida, Orlando, FL, USA

1) Power Electronics and Grid Control

Dr. Deepak Divan, Georgia Institute of Technology, Atlanta, GA, USA.


Over the last decade, power electronics has become intricately tied to the grid. Over 80% of new generation resources being deployed annually, including PV solar, wind and batteries, now require inverters to exchange energy with the grid. Increasing penetration of inverter-based resources (IBR) dramatically changes the dynamic behaviour of the grid, causing interactions between inverters and other grid elements. Traditional inverters, along with existing controls, are challenged to achieve the level of controllability and functionality needed for a new IBR dominant grid paradigm. This presentation will look at the role that power electronics has to play in this new grid that is emerging and will identify some of the challenges and opportunities that are becoming visible.

Dr. Deepak Divan is Professor, John E Pippin Chair, GRA Eminent Scholar and Director of the Center for Distributed Energy at the Georgia Institute of Technology in Atlanta, GA. His field of research is in the areas of power electronics, power systems, smart grids and distributed control of power systems. He works closely with utilities, industry and is actively involved in research, teaching, entrepreneurship and starting new ventures. Dr. Divan also serves as Founder and Chief Scientist at Varentec, in Santa Clara, CA, and was President and CTO from 2011-14, leading the company as it developed its suite of innovative distributed real-time grid control technologies. Varentec is funded by leading green-tech Venture Capital firm Khosla Ventures and renowned investor Bill Gates. Dr. Divan is an elected Member of the US National Academy of Engineering, member of the National Academies Board on Energy and Environmental Systems, a Fellow of the IEEE, past President of the IEEE Power Electronics Society, and is a recipient of the IEEE William E Newell Field Medal. He has 40 years of academic and industrial experience, 65 issued and pending patents, and over 400 refereed publications. He has founded or seeded several new ventures including Soft Switching Technologies, Innovolt, Varentec and Smart Wires, which together have raised >$160M in venture funding. He received his B. Tech from IIT Kanpur, and his MS and PhD degrees from the University of Calgary, Canada.

2) Power Decoupling Technologies for Single-Phase Grid-Connected Inverters

Dr. Liuchen Chang, University of New Brunswick, Fredericton, NB, Canada

Abstract: As the distributed energy resource market has been growing steadily, small renewable energy-based single-phase systems are proliferating in power distribution networks where single-phase inverters provide an interface between the resources and the ac grids. The mismatch of instantaneous power between the dc input from the resource and ac output to the grid requires power decoupling. This presentation focuses on the power decoupling and modulation technologies for single-phase grid-connected inverters. Conventional passive power decoupling techniques using large electrolytic capacitors at the dc-link were commonly used. In recent years, active power decoupling technologies have advanced, leading to a significant reduction in the capacitance of the dc-link capacitor to enable the use of small film capacitors and extend the lifetime of the overall converter system. The active power decoupling topologies are evolved into three control approaches: current-reference, dc voltage-reference and ac voltage-reference. This presentation provides a comprehensive overview of the decoupling topologies as well as the benefits and drawbacks of these topologies. In addition, a general comparison has also been made in terms of decoupling capacitance/inductance, additional cost, efficiency and complexity of control, providing a benchmark for future power decoupling topologies. Furthermore, pulse energy modulation (PEM) will be introduced for the control of single-phase inverters. Different from pulse-width modulation (PWM) techniques, PEM employs energy reference rather than the voltage or current reference to compare with the carrier waveform to generate triggering signals for inverter power switches.

After receiving his PhD degree in 1991, Liuchen Chang worked briefly in industry and then joined the University of New Brunswick in 1992, and is now a Professor Emeritus. He was the NSERC Chair in Environmental Design Engineering in 2001-2007, and the Principal Investigator of Canadian Wind Energy Strategic Network in 2008-2014. He has been an IEEE volunteer for over 30 years, including serving as VP Conferences in 2017-2020 and President of the IEEE Power Electronics Society in 2021-2022. He is a fellow of Canadian Academy of Engineering. He has published more than 400 refereed papers in journals and conference proceedings. Dr. Chang has focused on research, development, demonstration and deployment of renewable energy-based distributed energy systems.

3) Design of Medium-Frequency Medium-Voltage Transformers for Grid Applications

Dr. Juan Carlos Balda, University of Arkansas at Fayetteville, USA

Abstract: The dual-active-bridge (DAB) converter is widely used in a broad range of applications at many power and voltage levels. Better magnetic materials have enabled a methodology for designing medium-frequency transformers using customized ribbon-based nanocrystalline cores. The designer has the freedom of selecting the dimensions of the magnetic cores fitting the intended application, as opposed to typical design approaches where the availability of commercial cores determines the magnetic design.  The methodology is based on the development of a set of design equations based on only two parameters: core depth and number of turns. A parametric analysis allows selecting custom core dimensions and the turns numbers for the windings that best accomplish the transformer specifications. Two design examples are given to demonstrate the application of this methodology. The first one consists of a three-port transformer having two primary winding and one secondary winding. The second example consists of a three-phase transformer consisting of a single magnetic structure.

Juan Carlos Balda (IEEE M'78 SM'94) received his B.Sc. in Electrical Engineering from the Universidad Nacional del Sur (Bahía Blanca, Argentina) in 1979, and his Ph.D. degree in Electrical Engineering from the University of Natal (Durban, South Africa) in 1986. He was first employed as a researcher and a part-time lecturer at the University of Natal until July 1987. He spent two years as a visiting Assistant Professor at Clemson University, South Carolina. He has been at the University of Arkansas at Fayetteville since July 1989 where he is currently a University Professor, Department Head, and associate director for applications of the National Center for Reliable Electric Power Transmission (NCREPT). His main research interests are Power Electronics, Electric Power Distribution Systems, Motor Drives and Electric Power Quality. He is a senior member of the IEEE, member of the Power Electronics and Power & Energy Societies, and the honor societies Eta Kappa Nu and Tau Beta Pi.  He is also the chair of IEEE PELS TC5 committee and faculty advisor to the local chapter of the IEEE Power Electronics Society.

4) Introduction to Microinverters and Multi-Port PV Converters

Dr. Issa Batarseh, University of Central Florida, Orlando, FL, USA

Abstract: Decarbonization is the greatest engineering challenge of our time, and solar energy and energy storage systems play a major role in any future sustainable solution. Years of human ingenuity with governmental and industrial support have reduced the electricity cost from solar and wind sources to match that from natural gas. Replacing fossil fuel generation and electrifying industry sectors is the only viable option to drive for a deeply decarbonized society. In this talk, we will discuss the emerging technologies for solar photovoltaic (PV) systems. We will begin with an introduction to microinverters and a review of single-stage and two-stage inverters. Also, recent research development in single-port and multiport systems for PV application will be also presented. Finally, the presentation will also cover the implementation of dual and quad input DC-DC converter for photovoltaic (PV)  applications  where  two and four  PV panels are connected to the load through a single LLC tank, respectively. This topology uses Frequency Switching Modulation to regulate the load and Phase Shift Modulation to balance the power between both  sides  of  the  converter.  The  topologies features  a  low-cost  solution  due  to  the  number  of components  reduction  and  centralized  control  which  leads  to easier functionality and higher efficiency.

Issa Batarseh is currently a Pegasus Professor of electrical engineering in the Department of Electrical and Computer Engineering at the University of Central Florida (UCF) and serving as the director of the Florida Power Electronics Center. His research interests focus on power electronics as enabling technology in high-frequency, high-efficiency,  and smart grid-tied PV energy conversion systems. His research team has been leading the design, development, and commercialization of smart microinverters and other technologies. He has co-founded three start-up companies. He is a Fellow of the IEEE and AAAS, member of the National Academy of Inventors (NAI) and has been inducted into the Florida Inventors Hall of Fame. Dr. Batarseh is a Registered Professional Engineer in the State of Florida

WORKSHOP SEMINAR  FEB. 20, 2023 (16:45-17:45) 

“Renewable Energy Resources for Climate Change Mitigation NRIAG Strategy (RERCCMS)” 

1- Introduction to ‘Renewable Energy Resources for Climate Change Mitigation NRIAG Strategy 

 Gad Mohamed 

Prof. Gad El-Qady, is a Professor of Applied Geophysics working in the area of application of Geophysical techniques for, but not limited to, Environmental investigations, archaeological, geotechnical, groundwater and geothermal investigations. Currently, Prof. El-Qady is working as a president of the National Research Institute of Astronomy and Geophysics (NRIAG) since Jan 2019. Between July 2018 and Jan 2019, he was appointed as Vice President of NRIAG, and international relations coordinator of NRIAG since 2015.

During 2017 he was the acting president of the National Institute of Oceanography and Fisheries (NIOF), Egypt. From July 2016 to Jan 2017, he was the head of geomagnetic department at NRIAG. While during 2013-2014 he was coordinator of the international relations of E-JUST.

Prof. El-Qady was the science and culture attaché of Egypt in Japan from Feb 2010 to June 2013. During 2003 to 2005 he was JSPS visiting professors at Kyushu university, that same group where He got his PhD on 2001. Since that time is an active member of the Egyptian Geophysical community. Prof. El-Qady supervised many post-graduate students at different Egyptian universities. Prof. El-Qady, is the managing editor of the journal of National Research Institute of Astronomy and Geophysics (NRIAG) and has published many scientific papers, reviews, in peer reviewed international journals among them: archaeology, Earth Planets Space, Journal of African Earth Science, Earth and Planetary Science Letters, ….etc and he participate in several international Conferences and functioning as a referee for international Journals. He also organized several international conferences such as the 20th EMIW, ACAG5th, AFSC2016.

He is also a working group committee member of the Electromagnetic induction in the earth (WMIW) that is now Div No. 6 of the IAGA (2008-2016).

2- Geothermal Energy: A real opportunity for a sustainable future of clean energy in Egypt and Africa

Sustainable development processes are ongoing in Africa, and Egypt in particular, and this necessitates diversification in the exploitation of new energy resources that may be produced at competitive costs. In light of dwindling resources of fossil fuels, as well as rising environmental concerns, the need for clean and sustainable alternative energy is rising. Geothermal resources that haven't yet harnessed have the potential to supply additional kinds of renewable energy to fulfil local energy demands while allowing for a boost in power exports.

The majority of geothermal activity in Africa is localized in the continent's east and south, following the East African Rift System. Whereas, Africa has approximately 15 GW of geothermal potential in the Rift Valley between Mozambique and Djibouti. 830 MW of geothermal energy capacity has been installed by the beginning of 2019, with 823 MW being in Kenya. Kenya is gaining competence in this area and has identified more projects with a total capacity of around 5 GW to be deployed by 2030. Ethiopia and Tanzania are progressing with these additional initiatives to increase their generating capacity by 2500 MW by the end of 2030.

Egypt's energy is mostly produced from petroleum products, however Egypt's Supreme Energy Council has set an ambitious goal of increasing renewable energy's proportion of overall energy consumption to 20% by 2030. In Egypt, geothermal energy has an estimated installed capacity of 6.8 MW for direct heat use, with bathing and swimming, greenhouses, and space heating being the most prevalent direct heat applications. Geothermal energy has an estimated installed capacity of 6.8 MW for direct heat use in Egypt, with bathing and swimming, greenhouses, and space heating being the most prevalent direct heat applications. Our exhaustive exploration reveal that Egypt offers great geothermal potential in the Red Sea, Gulf of Suez, and Gulf of Aqaba coasts that could be used to produce power. On the other hand, the hot springs and thermal wells in the Western desert can be accessed directly.

Mohamed Abdel Zaher

Abdel Zaher is a professor at National Research Institute of Astronomy and Geophysics (NRIAG), Egypt. He earned his Ph.D. from the Earth Resource Engineering Department at Kyushu University in Japan in 2011.  He was given a postdoctoral position at Oulu University by Finland's Academy of Science (June 2012–July 2013). He is a member of many professional organizations, such as the Egyptian National Committee for the International Union of Geodesy and Geophysics (IUGG), the evaluation team for the Comprehensive Nuclear-Test-Ban-Treaty Organization (CTBTO), and the Egyptian Geophysical Society (EGS). He is presently the Head of the Geothermal Energy and Well Logging Research Unit at NRIAG.

3- Solar Energy Technologies Challenges and Green Hydrogen for Climate Change Mitigation 

Solar energy is one of the most renewable energy applications. Hydrogen will also make an important contribution to large-scale resilience in the sustainable energy system of the future. There is also more to be done to stimulate the production and use of green hydrogen, using electricity from solar and wind power for the electrolysis of water. NRIAG has a strong track record in research on solar energy and environmental sciences and engineering with a large portfolio of grants from Egypt’s public funder of research such as Science, Technology & Innovation Funding Authority (STDF), Academy of Scientific Research & Technology (ASRT) and industry in the area. To build on this success, NRIAG has established the interdisciplinary activities to develop multidisciplinary approaches to address both short term and longer-term challenges of solar energy generation, green hydrogen, energy demand reduction, energy security and sustainability. Disseminating the ongoing and past research outputs to local stakeholders is key to identify best strategies and solutions to adapt against the impacts of climate change.

Ahmed El-Sayed Ghitas

Ahmed Ghitas is a professor of solar energy physics, and founder of the Photovoltaic Research and Applications group, at the National Research Institute of Astronomy and Geophysics NRIAG, Egypt. He established and created a specialized unit for experimental and applied research in the field of solar Photovoltaic within the application of solar energy, called the Photovoltaic Research Unit (PVUNRIAG) at NRIAG. He developed the current solar radiation station existing in NRIAG and established other new stations at different locations in the country.

He had published 91 research articles in cited journals and international conferences in addition to attending and participations in more than 70 national and international conferences and workshops. He is a supervisor of 9 students M.Sc.  and 6 Ph.D.  He is a Principal Investigator of 5 projects funded by different organizations such as STDF and ASRT and arbitrated 12 projects, 12 theses, and research articles. He had awarded incentive Prizes to honor and recognize the best research publications.

He is a member of the Standing Committee for Promotions in Physics and Astronomy.  Member of the Board of the Geophysical Studies and Consultation Center at the National Research Institute of Astronomy and Geophysics. Member of the Graduate Studies Committee at NRIAG. He is a former member of the Energy & Electricity National Specialized Scientific Council at the Academy of Scientific Research and Technology, Egypt.

Prof Ghitas occupied several important positions, from 2006 to 2017; he was the Head of the Solar Research Laboratory, Department of Solar and Space Research, NRIAG; from 2010 to 2014.  Presently, he is Deputy Head of the Solar and Space Research Department and Director of the Photovoltaic Research Unit PVUNRIAG and Solar Energy at NRIAG.

4- Delineation the natural radioactivity values, the radiogenic heat production, and the land surface temperature: Examples from the Central Eastern Desert, Egypt

 The Central Eastern Desert (CED) region is one of the most promising areas for urban growth and reclamation projects of Egypt. The study area is covered with a variety of basement and sedimentary rocks ranging in age from Precambrian (mainly granite) to Quaternary (mainly sand sediments). The analysis of airborne magnetic and gamma-ray spectrometry data was combined into that of the remote sensing data (Landsat-9). The integrated analysis was used to identify the lithological distributions and to define the subsurface basement rocks that control the radioactivity in the study area. It was also used to determine the relationship between radiogenic heat production (RHP) and land surface temperature (LST) that was retrieved from the Landsat-9 thermal infrared sensor (TIRS) data. The LST map, calculated from Landsat-9 collection 2 level2, shows that the surface temperatures range from approximately 46.85 to 66.85 ◦C. The highest concentrations of eU, eTh, and K in the area were 67.7 ppm, 155.8 ppm, and 30.9%, respectively. The RHP values ranged from 1.6 μW/m3 to 31.7 μW/m3. The energy from heat emitted ranged from 508 to 932 Joules These relatively high anomalies are associated with basement outcrops and the sedimentary rocks overlying shallow basement rocks. The total horizontal derivative (THD) of the magnetic data describes the horizontal extension of the basement rocks due to the Red Sea rifting process. The Curie point depth (CPD), estimated from magnetic data, ranges from 5 km to 9 km. The results also exhibited geothermal gradients ranging from 90C/km to 176C/km, and heat flow ranges from 260 mW/m2 to 512 mW/m2. It was evident after comparing that the RHP and LST maps revealed the same features as the gamma-ray spectrometric maps.

Salah Saleh 

Prof. Saleh is a full Professor (from December 2012 till now), at National Research Institute of Astronomy and Geophysics (NRIAG), Egypt. He earned his Ph.D. Degree in Geophysics (2001), Channel System Program between Ain Shams Univ. and Friedrich Schiller University (Jena - Germany) as Scholarship presented from DAAD (June 1998 -October 2000). He was given a postdoctoral position at University of Hamburg - Germany (2019). He is a member of many professional national and international organizations. He is presently the Head of gravity laboratory, Department of Geodynamic at NRIAG. 

WORKSHOP SEMINAR   FEB. 20, 2023 (11:30-13:00)  

“Understand How to Write Good Papers for High Level Journals”

Prof. Frede Blaabjerg Aalborg Universitet, Denmark 

This workshop seminar tries to help to increase the chances to get papers published in international journals. To serve the goal, in this seminar:

✓ First, the procedure about how the paper review process is carried out will be explained.

✓ How will the paper be reviewed.

✓ Important aspects to consider when you write your paper. (Paper structure,what to do and what not to do).

✓ How to include citations to other work in a paper. 

Prof. Frede Blaabjerg

Aalborg Universitet, Denmark.

Frede Blaabjerg (S’86–M’88–SM’97–F’03) was with ABB-Scandia, Randers, Denmark, from 1987 to 1988. From 1988 to 1992, he got the PhD degree in Electrical Engineering at Aalborg University in 1995. He became an Assistant Professor in 1992, an Associate Professor in 1996, and a Full Professor of power electronics and drives in 1998 at AAU Energy. From 2017 he became a Villum Investigator. He is honoris causa at University Politehnica Timisoara (UPT), Romania in 2017 and Tallinn Technical University (TTU), Estonia in 2018.

His current research interests include power electronics and its applications such as in wind turbines, PV systems, reliability, Power-2-X, power quality and adjustable speed drives. He has published more than 600 journal papers in the fields of power electronics and its applications. He is the co-author of eight monographs and editor of fourteen books in power electronics and its applications.

He has received 38 IEEE Prize Paper Awards, the IEEE PELS Distinguished Service Award in 2009, the EPE-PEMC Council Award in 2010, the IEEE William E. Newell Power Electronics Award 2014, the Villum Kann Rasmussen Research Award 2014, the Global Energy Prize in 2019 and the 2020 IEEE Edison Medal. He was the Editor-in-Chief of the IEEE TRANSACTIONS ON POWER ELECTRONICS from 2006 to 2012. He has been Distinguished Lecturer for the IEEE Power Electronics Society from 2005 to 2007 and for the IEEE Industry Applications Society from 2010 to 2011 as well as 2017 to 2018. In 2019-2020 he served as a President of IEEE Power Electronics Society. He has been Vice-President of the Danish Academy of Technical Sciences.

He is nominated in 2014-2021 by Thomson Reuters to be between the most 250 cited researchers in Engineering in the world.