Dehua Zheng has completed his B.Sc. and M.Sc. degrees in Electrical Engineering from North China Electric Power University, Beijing, China in 1982 and 1987, respectively. He has also graduated another M.Sc. degree in Computer Engineering from the University of Manitoba, Canada in 1995. He has published more than 20 invention patents related to microgrid, renewable reseach energy areas. He has published more than 30 papers among which 6 SCI and EI journals. Dehua Zheng is currently a IEEE Senior Member, Deputy Director of China Smart Distribution System & Decentralized Generation Committee, Chief Scientist&General Manager of Goldwind Science and Technology Co., Ltd., IEC project leader for IEC/TS 62898-3-1 standard: ''Microgrids-Technical Requirements, Protection and Dynamic Control''(currently the standard has reached the state of DTS), and he is registered senior electrical engineer in North America and PhD. professor in many universities.
Microgrid is a group of interconnected loads and distributed energy resources (including microturbines, diesel generators, energy storage, renewable resources, and all other kinds of distributed energy resources) at distribution level with defined electrical boundaries that has black start capacity and can operate in island mode and/or grid-connected mode.
Because of the uncertainty, intermittent, and discontinuity of the renewable resources, transient disturbance and dynamic disturbance exist in the microgrid. For the fault current is small in the system and the microgrid has very little inertia, the disturbance control and fault protection of microgrids are more difficult than the ones of traditional grids.
The most challenging part of protection and dynamic control of microgrids is how to distinguish whether a fault or disturbance is occurring in the system. In the microgrid, there may appear transient characteristics similar to the transient and dynamic disturbance at the initial faults. If there is a fault, the transient disturbance control should be used to prevent the system from collapsing and make sure the right breakers should be tripped. But if there are transient and dynamic disturbances, even the initial characteristics of the transient and dynamic are very similar to the fault ones, the breakers should not be tripped.
Michael Leung research areas include solar photocatalysis, fuel cell and advanced air-conditioning. His research emphasizes the development of modified nanostructured materials to perform various functional photoelectrochemical activities. He has also developed photocatalytic fuel cell reactors by integration of photocatalytic and electrochemical systems to achieve simultaneous waste water treatment and generation of free electricity. His research works are impactful and have received international recognition as he is recently listed as a Highly Cited Researcher by Clarivate Analytics in 2018. He is also listed as a Most Cited Scholar in Energy Science and Engineering by ShanghaiRanking Consultancy in collaboration with Elsevier. Prof. LEUNG has received total HK$40M+ research grants as a PI from NSFC, ITF, RGC, ECF, SDF, industrial sponsorships, university internal grants, donations, etc. He has published 150+ journal papers, 80+ conference papers, 15 books/book chapters, and 7 patents.Â
Solar photocatalysis is a promising approach to achieve production of renewable hydrogen fuel for future sustainable energy. Photocatalysis (PC) can also be integrated with fuel cell (FC) to form photocatalytic fuel cell (PFC) that effectively utilizes solar energy for simultaneous wastewater treatment and recovery of energy chemically stored in wastewater. PFC using photoanode and photocathode can utilize solar energy effectively for hydrogen production, carbon reduction, wastewater treatment and recovery of the energy chemically stored in wastewater. Solar PC can decompose organic compounds while the FC component provides an electrical potential bias to drive the transport of the photogenerated electrons. In this talk, the speaker will first discuss the properties and fundamental mechanisms of solar photocatalysis followed by the development of effective visible-light activated nano-photocatalysts. Then, different reactor configurations, designs and control strategies for various applications will be presented. The talk will also cover upcoming R&D challenges for enhancing the solar photocatalysis technologies.
D. Sangeetha is an Assistant Professor in the Department of Mechanical Engineering, Anna University. Her Google scholar citation is 1739 with an h-index of 23 and i-10 index of 52. She has 2 granted Indian patents in the field of Fuel Cells. Twelve students have completed their Ph.D. under her guidance. She has successfully carried out a number of sponsored research projects funded by various agencies like DST, DBT, BRNS, CSIR, UGC and ICMR and 5 students are presently pursuing their Ph.D. in various fields like fuel cells, desalination, biopolymers for drug delivery and tissue engineering applications under her guidance.
She was awarded the Active Researcher Award 2012 by Anna University. She was awarded the H. Nandy Memorial Award at the Indian Engineering Congress 2014. She is also the recipient of Womens Achiever Award 2017 as recognized by Anna University. As a student’s mentor, she was awarded twice for the Student Innovative Project Award 2017 and 2018 in the Dept. of Mechanical Engineering by CTDT, Anna University. She received the Wenlock Endowment Scholarship for the year 2016-2017 for high impact research publication in 2018 by Anna University. Dr Sangeetha Dharmalingam has been certified as Professional Engineer in Metallurgy and Materials Engineering Discipline by The Institution of Engineers (India) in 2019.
Proton exchange membrane fuel cells (PEMFC) are increasingly becoming an attractive energy source for the future due to their portability, silent operation and high power density. Efforts have been made to improve their efficiency as well as in making the technology affordable. Several parameters come into play in the context of fuel cell efficiency, of which the operating temperature is of prime importance. Specifically, high temperature PEM fuel cell (HTPEMFC) has greater merits such as higher efficiency, improved tolerance of the electrodes against carbon monoxide poisoning, faster reaction kinetics, and effective heat transfer. Since the proton conductivities of commonly used perfluorinated membranes, such as Nafion, is highly dependent on external humidification, their operating temperature is limited to 100 °C. Hence one of the biggest challenges in PEMFC is fabricating a thermally stable membrane which can operate at temperatures above 100 °C under anhydrous conditions.
In the present work phoshonated SBA-15/phosphonated Poly(styrene-ethylene-butylene-styrene) (PSEBS) composite membranes are developed for high temperature fuel cell electrolyte. Mesoporous Santa Barbara Amorphous (SBA-15) was synthesized and it was grafted with phosphonate functionality using a simple two-step process involving chloromethylation and subsequent phosphonation. The phosphonated SBA-15 (PSBA-15) was characterized using Fourier transform infra-red (FTIR) spectroscopy, solid state 13C Nuclear magnetic resonance (NMR), 29Si NMR, 31P NMR for confirming successful modification. Morphology features were verified by small angle X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Transmission electron microscopy TEM analyses. Poly(styrene-ethylene-butylene-styrene) (PSEBS) was chosen as the base polymer and phosphonic acid functional groups were grafted onto the polymer using the aforementioned approach, where chloromethyl (-CH2Cl) groups were attached to the main chain using Friedel Craft’s alkylation, followed by the phosphonation of the chloromethylated polymer by the Michaels-Arbuzov reaction resulting in phosphonated PSEBS (PPSEBS). The functionalisation was confirmed using NMR and FTIR spectroscopy studies. Composite PPSEBS/PSBA-15 membranes were fabricated with different filler concentrations (2, 4, 6, and 8%) of PSBA-15. Various studies such as water uptake, ion exchange capacity and the proton conductivity of the composite membranes were undertaken with respect to fuel cell applications. From the studies, it was found that the PPSEBS/PSBA-15 membrane with 6% wt of filler exhibited maximum proton conductivity of 8.62 mS/cm at 140 °C. Finally, membrane electrode assembly (MEA) was fabricated using PPSEBS/6% PSBA composite membrane, Platinium (Pt) anode, Pt cathode and was tested in an in-house built fuel cell setup. A maximum power density of 226 mW/cm2 and an open circuit voltage of 0.89 V was achieved at 140 °C under un-humidified condition.
Taha Selim USTUN received his Ph.D. degree in electrical engineering from Victoria University, Melbourne, VIC, Australia. Currently, he is a researcher at Fukushima Renewable Energy Institute, AIST (FREA) and leads Smart Grid Cybersecurity Lab. Prior to that he was an Assistant Professor of Electrical Engineering with the School of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA, USA. His research interests include power systems protection, communication in power networks, distributed generation, microgrids, electric vehicle integration and cybersecurity in smartgrids. Dr. Ustun is an Associate Editor of the IEEE ACCESS and Guest Editor of the IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS, Energies, Electronics and Information Journals. He is a member of IEEE 2004, IEEE 2800 Working Groups and IEC Renewable Energy Management Working Group 8. He has edited several books and special issues with international publishing houses. He is a reviewer in reputable journals and has taken active roles in organizing international conferences and chairing sessions. He has been invited to run specialist courses in Africa, India and China. He delivered talks for Qatar Foundation, World Energy Council, Waterloo Global Science Initiative and European Union Energy Initiative (EUEI).
Wide-scale deployment of Smart Inverters (SIs) can only happen if their impacts on power systems can be clearly understood. For this reason, thorough power flow and system stability studies are required. Traditional power system simulation software does not include proper models for SIs. Furthermore, dynamic behavior of SIs is not very well known to develop such models. Consequently, hardware in the loop tests with digital real-time simulators seem to be the best option, due to their high fidelity. That being said, interface between the simulated and real-world plays a very significant role. Since the real world is sampled and these samples are utilized to map reality inside digital real-time simulator, any mistake may render the test unstable. On the other hand, real-time simulation has very strong timing requirements and this becomes a deciding factor on how much detail can be modeled. Since the bridge inverters have several components that operate in time steps that are much smaller than conventional power systems, digital real-time simulators have very limited capacity. Using simplified inverter models has been investigated in the past and shown to be acceptable in steady-state situations. This paper investigates use of such models for protection studies in low-voltage networks.
Associate Professor of geometallurgy at the Geological Survey of Finland (GTK) in KTR, the Circular Economy Solutions Unit. Basic degree Bach App. Sc in Physics and Geology, PhD in Mining Engineering from JKMRC University of Queensland. Work experience 18 years in the Australian mining industry in research and development, 12 months at Ausenco in the private sector, 3 years in Belgium at the University of Liege researching Circular Economy and industrial recycling. Work experience in Finland has been at GTK has been in the Minerals Intelligence in the MTR unit, before joining the KTR. Mineral processing and geometallurgy being developed.
Long term objectives include the development and transformation of the Circular Economy, into a more practical system for the industrial ecosystem to navigate the twin challenges of the scarcity of technology minerals and the transitioning away from fossil fuels.
A study was conducted to examine what is going to be required to fully phase out fossil fuels as an energy source and replace the entire existing system with renewable energy sources and transportation. This is done by estimating what it would be required to replace the entire fossil fuel system in 2018, for the US, Europe, China, and global economies. This report examines the size and scope of the existing transport fleet, and scope of fossil fuel industrial actions.
To replace fossil fueled ICE vehicles, Electric Vehicles, H2 cell vehicles for cars, trucks, rail, and maritime shipping was examined. Fossil fuels consumption for electricity generation, building heating and production of steel were all examined for replacement. Calculations reported here suggest that the total additional non-fossil fuel electrical power annual capacity to be added to the global grid will need to be around 37 670.6 TWh. To phase out fossil fuel power generation, solar, wind, hydro, biomass, geothermal and nuclear were all examined. If the same non-fossil fuel energy mix as that reported in 2018 is assumed, then this translates into an extra 221 594 new power plants will be needed to be constructed and commissioned.
Nuclear power was assessed in context of being the only power source to generate electricity. It was found that the NPP fleet cannot expand fast enough, nor will existing uranium resources be enough to be useful.
Biofuels substitution for petroleum (gasoline and diesel) was examined globally. It was found that lack of capacity for the planet earth to produce enough biomass feedstock means that biofuels cannot be scaled up to a full system replacement.
Conclusions were drawn after comparing all these different aspects. It was proposed that the phasing out of fossil fuels will not go to plan.