Tutorial

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1.

Modeling and Control of Grid-Tied Converters for Distributed Energy Resources

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Speaker(1)

Name

Jingyang Fang

 

Title

Full Professor

Affiliation

Shandong University

Email

jingyangfang@sdu.edu.cn

Speaker(2)

Name

Hao Tian

Title

Full Professor

Affiliation

Shandong University

Email

haotian@email.sdu.edu.cn

Speaker(3)

Name

Tao Xu

Title

Associate Professor

Affiliation

Shandong University

Email

txu@sdu.edu.cn

Speaker(4)

Name

Feng Gao

Title

Full Professor

Affiliation

Shandong University

Email

fgao@sdu.edu.cn

 

Abstract

Distributed energy resources, such as solar photovoltaics (PV) and wind, generally penetrate into modern power grids via grid-tied converters, which determine the active/reactive power injection and current/voltage quality, thereby making themselves the enabler of distributed energy sources. However, the large-scale deployment of grid-tied converters challenges the secure and reliable operation of modern power grids in terms of stability and power quality at both converter and system levels. Typical challenges include the loss of inertia and damping, reduced grid strength, and over-current problem as well as excessive circulating currents, current/voltage harmonics, synchronization, etc. To overcome such challenges, accurate modeling and advanced control of individual and multiple grid-tied converters are expected. To this end, the tutorial will comprise the following aspects: modeling and control of grid-forming converters, advanced multilevel converters with novel topologies and grid-supportive services, and multiple grid-tied converters with self-synchronized carrier waves. The tutorial targets at stability analysis and improvement, delivery of grid-supportive services, high-efficient and low-cost power converter design, synchronization without dedicated communication cables, switching harmonic suppression, and circulating current attenuation of grid-tied converters for distributed energy sources. In particular, the tutorial will cover some state-of-the-art industrial products and their design experience.

2.

Power Electronics as the Enabling Technology for Buildings Decarbonization

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Speaker(1)

Name

Dmitri Vinnikov

Title

Research Professor

Affiliation

Tallinn University of Technology

Email

dmitri.vinnikov@taltech.ee

Speaker(2)

Name

Andrii Chub

Title

Senior Researcher

Affiliation

Tallinn University of Technology

Email

andrii.chub@taltech.ee

Speaker(3)

Name

Andrei Blinov

Title

Senior Researcher

Affiliation

Tallinn University of Technology

Email

andrei.blinov@taltech.ee

Abstract

As the world combats climate change, the decarbonization of buildings stands out as a pivotal goal. Buildings significantly contribute to greenhouse gas emissions, largely due to their energy consumption. Nowadays, energy performance labels are assigned to existing and newly commissioned buildings. Moreover, some countries forbade commissioning new buildings with labels below “A.” Achieving sustainability in the built environment necessitates innovative solutions that can dramatically reduce carbon footprints. The existing technologies based on AC distribution have reached maturity, and new approaches are required to enhance the energy efficiency of buildings further. The combination of power electronics and DC microgrids has emerged as a transformative technology in this endeavor. To accelerate the transition to decarbonized buildings, it is essential to foster innovation, invest in research and development, and promote policies that encourage the adoption of power electronics and DC microgrid solutions. They can further optimize energy usage, integrate renewable energy sources, and create highly efficient and sustainable building ecosystems. DC buildings feature enhanced resilience, for example, in the face of grid failures or disasters. DC microgrids with power electronics can operate autonomously, providing critical power to essential systems like lighting, communication, and HVAC, independently from the AC-grid. This makes power electronics and DC microgrids indispensable tools for building stock decarbonization. Their combined use not only reduces carbon emissions but also improves energy sustainability and grid independence of buildings.

This tutorial will explore the essence of residential DC distribution technology and provide an insight into recent development trends, standardization, and challenges. It will demonstrate a set of emerging power electronic technologies for the in-house energy generation, distribution, storage, and management of DC buildings as well as their interaction with AC-grid.

Key words

Electrification, energy efficient buildings, power electronics systems, dc microgrids, grid-interactive buildings

3.

Stability and Control of Grid-Forming Converters

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Spesker(1)

Name

Xiongfei Wang

Title

Professor

Affiliation

KTH Royal Institute of Technology

Email

xiongfei@kth.se

Speaker(2)

Name

Heng Wu

 

Title

Assistant Professor

Affiliation

Aalborg University

Email

hew@energy.aau.dk

Abstract

The grid-forming (GFM) technology is emerging as a promising approach for massive integration of inverter-based resources (IBRs) into electrical grids. Being controlled as a voltage source behind an impedance, GFM-IBRs can provide adequate services to enhance the reliability and resilience of the power network, and they also feature higher stability robustness against grid strength variation than conventional IBRs. In recent years, there is a growing consensus on the need of GFM-IBRs in the future power electronic dominated power systems. Many research and development (R&D) efforts have been initiated, by governments, power system operators, energy developers, and vendors of IBRS, on the technical specifications/grid codes, hardware and control solutions for GFM-IBRs.

This tutorial intends to cover both the basics and advances in GFM-IBRs that can fit the requirements of the evolving technical specifications/grid codes. The tutorial will start with the basic principles and typical control architectures of GFM-IBRs, which will be followed by the small-signal modeling, stability analysis, and damping control to guarantee the small-signal stability of GFM-IBRs considering different DC-link dynamics under various grid strengths. Then, the dynamics analysis of GFM-IBRs under large grid disturbances, e.g., grid faults and phase jumps, will be performed, covering the transient stability analysis, current limitation strategies, as well as GFM service provisions. In the end, perspectives on the prospects and challenges with the grid integration of GFM-IBRs will be shared.

Key words

Inverter-based resources, grid-forming, stability

Biography(1)

Xiongfei Wang is a Professor at KTH Royal Institute of Technology, Sweden, and a part-time Professor with AAU Energy, Aalborg University, Denmark. He has been active tutorial instructors (e.g., PEDG, APEC, ECCE, EPE, eGrid) on stability and control of inverter-based resources and power systems. Dr. Wang is an IEEE Fellow and the recipient of the Richard M. Bass Outstanding Young Power Electronics Engineer Award, the IEEE PELS Sustainable Energy Systems Technical Achievement Award, the Isao Takahashi Power Electronics Award, and of the Clarivate Highly Cited Researcher during 2019-2021.

Biography(2)

Heng Wu is currently an Assistant Professor with AAU Energy, Aalborg University, Denmark. His research interests include the modelling and stability analysis of the power electronic based power systems. He is the Chairman of IEEE Task Force on Frequency-domain Modeling and Dynamic Analysis of HVDC and FACTS, the subgroup leader of CIGRE working group B4/C4.93 “Development of grid forming converters for secure and reliable operation of future electricity systems”, and the member of GB grid forming best practice expert group formed by national grid ESO, U.K. He is identified as world’s top 2% scientist by Stanford University from 2019.

4.

SiC MOSFET Gate Drivers for High-Power Applications

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Speaker (1)

Name

Drazen Dujic

Title

Associate Professor

Affiliation

EPFL, Switzerland

Email

drazen.dujic@epfl.ch

Speaker (2)

Name

Chengmin Li

Title

Assistant Professor

Affiliation

TU/e, Netherlands

Email

c.li7@tue.nl

Abstract

As the next-generation power devices, SiC MOSFETs are gradually increasing their presence in a wide range of applications. Compared with the silicon counterparts, SiC MOSFET has higher voltage blocking capability, high switching frequency and potential high-temperature capability. These superior characteristics will significantly improve the performance of power conversion systems where efficiency and power density are the most critical performances. As the link between the control and power in the power electronics system, gate driving of SiC MOSFETs is critical to fully utilize the potential of the devices. However, simply leveraging solutions for Si devices are not enough. The challenges brought by high-speed switching, reliability-related issues and cost constraints require continuous work. This tutorial covers the basics of the SiC devices, the ultra high-speed switching characteristics, the gate driving principles and device protections, as well as the high power applications of SiC MOSFETs. This will be supported by practical examples and learnings of the authors from Power Electronics Laboratories at EPFL, Switzerland and TU/e, Netherlands-

Key words

Power semiconductors, SIC, MOSFET, Gate driver, protection

Biography(1)

Prof. Drazen Dujic is an Associate Professor and Head of the Power Electronics Laboratory at EPFL in Lausanne, Switzerland. He received his PhD degree from Liverpool John Moores University in 2008. From 2009 to 2013 he was with ABB Switzerland and has joined EPFL in 2014. His research interests include the areas of design and control of advanced high-power electronic systems and high-performance drives, predominantly for the medium voltage applications related to electrical energy generation, conversion and storage.

Biography(2)

Prof. Chengmin Li is an Assistant Professor at TU/e in Eindhoven, Netherlands. He was a Postdoctoral researcher at Power Electronics Laboratory at EPFL in Lausanne, Switzerland from 2020 to 2023. He received the Ph.D. degree from Zhejiang University, Hangzhou, China in 2019. From March 2016 to March 2017, he was a Research Intern with the GE Global Research Center, Shanghai, China. His research interests are related to medium voltage high converters and application of SiC power MOSFETs. Dr. Li was the recipient of PCIM Asia Young Engineer Award in 2022.

5.

Design and Control of Solid-State DC Transformers for DC Transmission and Distribution Grids

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Speaker(1)

Name

Rik W. De Doncker

Title

Professor

Affiliation

RWTH Aachen University

Email

dedoncker@eonerc.rwth-aachen.de

Speaker(2)

Name

Jingxin Hu

Title

Professor

Affiliation

Nanjing University of Aeronautics and Astronautics

Email

jingxin.hu@nuaa.edu.cn

Speaker(3)

Name

Shenghui Cui

Title

Assistant Professor

Affiliation

Seoul National University

Email

cuish@snu.ac.kr

Speaker(4)

Name

Subhashish Bhattacharya

Title

Professor

Affiliation

North Carolina State University

Email

sbhatta4@ncsu.edu

Tutorial title

Design and Control of Solid-State DC Transformers for DC Transmission and Distribution Grids

Abstract

The transition from a predominantly fossil fuel-based power generation towards renewable power sources, predominantly wind turbines and photovoltaic systems, inevitably leads towards an energy supply system that greatly depends on power electronics to feed the energy in the electrical grid. As all power electronic driven systems are intrinsically DC sources or loads, DC transmission and distribution systems become evident, not only because it is more efficient and cost effective, but also increases the ampacity of cables. The development and commercialization of medium-voltage, multi-megawatt DC-DC converters, also called solid-state DC transformers, is a key enabler to realize flexible and interconnected DC grids. Compared to AC transformers, solid-state DC transformers not only need to transform voltage and control power flow, but also need to offer similar efficiencies (up to 99%) at high switching frequencies, provide the same insulation levels and limit fault currents, that is, offer fault-ride-through capabilities. In this tutorial, we introduce and describe the latest advances and best practices of galvanically isolated bidirectional DC-DC converters for solid-state DC transformers. It covers a wide selection of key enabling technologies from converter topologies, optimized control, to the design of highly efficient megawatt medium-voltage DC-DC converters based on emerging MV SiC devices.

 

 

6.

High-Power Converters for Power-to-X Applications

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7.

Power Quality and Operability of Distributed Power Generation Systems: Advanced and Intelligent Control

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Speaker(1)

Name

Yongheng YANG

Title

ZJU100 Professor

Affiliation

Zhejiang University, China

Email

yoy@zju.edu.cn

Speaker(2)

Name

Chi-Seng LAM

Title

Associate Professor

Affiliation

University of Macau (UM), Macau

Email

cslam@um.edu.mo

Speaker(3)

Name

Nick PAPANIKOLAOU

Title

Professor

Affiliation

Democritus University of Thrace, Greece

Email

npapanik@ee.duth.gr

Abstract

Power electronics is the key technology on the way towards cleaner and sustainable energy generation, distribution and use. Their applications are expanded to all forms of electric energy systems, i.e., ac – dc – hybrid, grid-tied, multi-connected or standalone, urban or rural, residential or industrial / commercial, (distributed) generation systems. Thanks to the fast-growing power electronics and intelligent control technologies that they incorporate, distributed power generation systems (DPGS) have a catalytic role in the increase of renewable energy share in the Energy Sector. As such, the impressive growth of distributed generation installations, the fast electrification of all transportation means, the evolution of Smart Grid concept and the transformation of the Building Stock into Zero Energy Buildings, are tangible results of the advances. However, modern DPGS also encounters many technical challenges, where maintaining uninterruptible, high power quality supply and smart management services to their users is of importance and complying with the relevant international standards (IEEE Stds 1547-1018, 2030.7-2017, 2030.10-2021 etc.) is of concern. Thus, more advanced, and intelligent control loops are required to meet those operational needs. In this context, advanced power electronics solutions, including Artificial Intelligence (AI), are gaining a lot of interest in the power electronics based DPGS. To this end, the power electronic units become more autonomous in making important decisions even in near real-time scale in the DPGS. Hence, they are transformed into powerful tools in the service of the modern DPGS. With this in mind, the tutorial is proposed for intermediate and advanced audiences, and it is dedicated to tackling the technological challenges of the wide-scale adoption of power electronics-based distributed generation systems. It provides a step-by-step design of the key - power electronics for DPGS considering the stringent standards. The focus is to innovate and improve the power quality and operability by means of advanced control to create more sustainable, grid-friendly, efficient, and reliable DPGS that comply with grid regulations and contribute to reducing the cost of energy, as well as secure and reliable grid operation. The tutorial is intended for intermediate and advanced audiences in the field of power electronics, engineers and researchers, who are looking for advanced solutions to the modern DPGS. 

8.

Multi-Cell & Multi-Level Power Converters 'From Theory to Practice'

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Speaker(1)

Name

Petar J. Grbović

Title

Univ. Prof. Dr.

Affiliation

University of Innsbruck

Email

petar.grbovic@uibk.ac.at

Speaker(2)

Name

Thierry. A. Meynard

Title

Prof. Dr.

Affiliation

LAPLACE / ENSEEIHT / INPT

Email

Thierry.Meynard@laplace.univ-tlse.fr

Speaker(3)

Name

Zoran Miletić

Title

Dipl. Eng

Affiliation

Austrian Institute of Technology (AIT)

Email

zoran.miletic@ait.ac.at

Abstract

Power Electronics and Static Power Converters in general are today part of every segment of our life. Any piece of electric equipment we are using today is somehow based on power electronics and static power converters; home appliance, industrial equipment, renewable energy, IT, automotive, avionic, etc., etc. Conversion efficiency, specific power, power density and the converter cost are today the most critical requirements for new applications. One way to increase the efficiency and reduce cost/size/weight of the converter is to deploy new power semiconductor such as SiC and GaN power switches.

In the last decade, we have seen a dramatic progress, particularly in the field of power semiconductors and power converters topologies. Each new generation of power semiconductor introduces a new challenge and issue. Some of the issues such as extreme di/dt and du/dt in combination with the device and the package parasitic inductance and capacitance make almost impossible to fully utilize all advantages of the new WBG (SiC and GaN) power semiconductor devices. Some possible solutions to above mentioned issues, which have been under the spot for more than two decades are “New” topologies such as Multi-Level (Series Interleaved) and Multi-Cell (Parallel Interleaved) Converters.

After an introduction to fundamentals of Static Power Converters and Topologies, new WBG power semiconductors and associated di/dt and du/dt issues will be addressed and discussed in the 2nd and 3rd part of the tutorial. The 4th and 5th part of the tutorial will cover theory of Multi-Cell (Parallel Interleaved) and Multi-Level (Series Interleaved) topologies. The advantages, such as significant volume reduction of the converter input and output LC filter and the DC BUS capacitor will be extensively discussed. Moreover, strong impact on the device switching performances including switching loses and the switch over-voltage stress will be addressed too.Series & Parallel Multi-Level Converters will be addressed in the 6th part of the tutorial. Finally, in the concluding part of the tutorial, design guidelines will be addressed. Several design cases will be presented and intensively discussed too.

9.

Computer-aided Accurate Modeling and Design Optimization for Isolated Resonant DC-DC Converters

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10.

Modelling and Control of Wireless Power Transfer: State of the Art

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Speaker(1)

Name

Minfan Fu

Title

Associate Professor

Affiliation

ShanghaiTech University

Email

fumf@shanghaitech.edu.cn

Speaker(2)

Name

Yun Yang

Title

Assistant Professor

Affiliation

Nanyang Technological University

Email

yun.yang@ntu.edu.sg

Speaker(3)

Name

Yong Li

Title

Associate Professor

Affiliation

Southwest Jiaotong University

Email

Yong_Li@swjtu.edu.cn

Abstract

In recent times, there has been a resurgence of interest in wireless power transfer (WPT), driven by the pressing need to wirelessly charge a multitude of consumer electronic devices such as smartphones, laptops, tablets, medical implants, and various peripherals. End users aspire to sever the final physical connection, the electrical charging wire, so that, for the first time, both information and power can be accessed ubiquitously through the air. WPT not only streamlines and secures the daily charging routine, but it also paves the way for a new paradigm in power management. This tutorial will commence with an overview of the fundamental aspects of wireless power transfer systems, highlighting the advantages and trade-offs associated with different solutions. It will delve into a comprehensive examination of two fundamental near-field coupling methods: magnetic field coupling and electrical field coupling, offering a unified perspective. This presentation aims to convey the core concepts starting from a foundational level, encompassing the coupler structure, coupler model, compensation networks and their design objectives, inverters and rectifiers, modulation, hybrid compensation, converter model, and dynamic control. Additionally, a brief review of the current state-of-the-art and potential challenges in WPT will be provided.

Biography(1)

Minfan Fu received the B.S., M.S., and Ph.D. degrees in electrical and computer engineering from University of Michigan-Shanghai JiaoTong University Joint Institute, Shanghai Jiao Tong University, Shanghai, China in 2010, 2013, and 2016. He is currently a tenured Associate Professor at School of Information Science and Technology (SIST). 

Biography(2)

Yun Yang received his Ph.D. degree in Electrical Engineering from The University of Hong Kong in 2017. He was a Research Assistant Professor in the Department of Electrical Engineering, the Hong Kong Polytechnic University from 2020 to 2022, and an Honorary Research Assistant Professor in the Department of Electrical and Electronic Engineering, the University of Hong Kong.  

Biography(3)

Yong Li, Associate Professor with Southwest Jiaotong University, received the B.Sc. and Ph.D. degrees from the School of Electrical Engineering, Southwest Jiaotong University, Chengdu, China, in 2013 and 2017, respectively. From 2017 to 2018, he was a Research Associate at the Department of Electrical Engineering, The Hong Kong Polytechnic University, and subsequently, he was a Post-Doctoral Fellow with the same department.

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