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Tutorial

Integrated Microinverter and Energy Storage 

Nasser Kutkut, Issa Batarseh and Khalil Alluhaybi

Brief Introduction:

    The small-scale applications using solar energy creates a new dimension in renewable energy revolution. Through distributed generation, it is possible to have bidirectional power flows in the distribution network. This has changed the roles of consumers and producers in the energy market. Nowadays, a typical consumer has the potential to feed power into the grid, resulting in a cleaner energy generation. In residential applications, the focus is on the module integrated converters, such as microinverter technology. This technology provides very compact design in which the inverter and electric storage can be attached to the back of PV panel, enhancing energy harvesting and system efficiency, improving flexibility and modularity. The technology also allows for plug and-play applications with lowers installation costs. The demand for low-cost solar with storage helps in explaining the power of the solar industry to develop residential PV systems. By 2023, Wood Mackenzie Power ↦ Renewables expects the PV storage system to account for 90% of all residential deployments in the United States. However, this only will happen if there is enough innovation to make PV storage system reliable and affordable for customers. The session will try to cover several topics to discuss the possible solutions from perspective of technical views from new multi-port microinverter, battery power management, to advanced grid interactions with battery support.

Introduction to inverter and microinverter system architectures: Within PV systems, power inverters are required to inject the PV power into the AC grid. Traditionally, centralized inverters have been used for solar farms. Currently, string and multistring inverters, as well as their bypass module and generation control circuit concept variations, are extensively used in utility scale PV systems. In residential applications, most research is focused on the module integrated converters, such as microinverter technology and dc–dc power optimizers. The main design challenges within the microinverter are the further improvements within efficiency as well as guaranteeing reliable operation throughout the module lifetime. In addition, the manufacturing costs of an individual module are relatively high, and therefore, mass production of these inverters would decrease the cost at the long term.

Battery Management: Fundamental electrochemical-thermal models for batteries will be covered in this discussion. Simplified equivalent circuit models (ECM) based on electrochemical thermal modeling and extensive results from the various project testbeds will be covered. The interdisciplinary discussion will help power electronic researchers aware of possible performance limiting factors due to aging through variable parameters and try to make battery more affordable and safer.

Advanced Grid Interactions with support of battery storage systems: This talk will focus on the benefits from integrating PV and storage to enable grid resiliency features such as black start, grid voltage and frequency support, complete island operation, smooth transition between grid-tied mode and islanding operations, and a micro-grid operation with support of energy storage system.

image.pngNasser Kutkut a world expert in industrial battery charging and management solutions. Dr. Kutkut has over 17 years of technology leadership and management experience developing and commercializing innovative battery management technologies for motive and stationary power battery markets. He has a wide array of business expertise in the areas business start-ups, sales and marketing strategy development, technology and product development, as well as extensive technical expertise in the areas of renewable energy power systems, battery charging and monitoring technologies for motive power applications, energy storage systems, and smart grid technologies. Dr. Kutkut is a holder of 13 issued U.S. and international patents and has published more than 70 papers in leading technical and trade journals. Dr. Nasser Kutkut received the B.Sc. degree in electrical engineering from the Jordan University of Science and Technology, Jordan, in 1989, the M.Sc. degree in electrical engineering and computer science from the University of Illinois, Chicago, in 1990, the Ph.D. degree in electrical, and the MBA degree in management and entrepreneurship, both from the University of WisconsinMadison, in 1995 and 2001, respectively, and a Doctorate in Business Administration (DBA) degree in entrepreneurship and marketing from Grenoble Ecole de Management, Grenoble, France in 2013.

    

image.pngIssa Batarseh eceived the B.S.E.E. degree in electrical and computer engineering from the University of Illinois, Chicago, IL, USA, in 1983 and the M.S. and Ph.D. degrees in electrical engineering from the University of Illinois, Chicago, IL, USA, in 1985, and 1990, respectively. He is currently a Professor of electrical engineering with the Department of Electrical and Computer Engineering, the University of Central Florida (UCF), Orlando, FL, USA. From 1989 to 1990, he was a Visiting Assistant Professor with Purdue University, Calumet, IN, USA, before joining UCF in 1991. He has published more than 82 refereed journals and 300 conference papers in addition to 31 U.S. patents. He is also an Author of a textbook entitled Power Electronic Circuits (Wiley, 2003) and Co-author of the 2nd edition entitled Power Electronics (Springer, 2018). His team at the Florida Power Electronics Center (FPEC) has been leading the design, development, and commercialization of smart microinverters, and smart EV and industrial chargers. His research interests include power electronics and energy conversion systems for smart-grid and renewable energy applications. Dr. Batarseh is a registered Professional Engineer (PE) in the State of Florida and a Fellow of AAAS. He is a member of the National Academy of Inventors (NAI) and recently inducted into the Florida Inventors Hall of Fame. He has served as a Chairman for IEEE Power Electronics Specialists Conference 2007 and was the Chair of the IEEE Power Engineering Chapter, the IEEE Orlando Section and is now serving as the Chair of IEEE-PELS Education Committee.


image.pngKhalil Alluhaybi received the B.S. degree in electrical engineering from Taibah University, Medina, KSA, and the M.S degree in electrical engineering from University of Central Florida (UCF), Orlando, FL, USA, in 2011 and 2017, respectively. He is currently working toward the Ph.D. degree in electrical engineering at UCF. He is currently with the Florida Power Electronic Center (FPEC), UCF. His current research interests include microinverter topologies for photovoltaic (PV) applications, digital control in power electronics, efficiency optimization of dc/ac inverters, and soft switching techniques.