Presented by: Dr. Shuhui Li, University of Alabama This webinar: Part 1 of 2 – This session focuses on grid-forming (GFM) and hybrid GFM/grid-following (GFL) inverters. It first provides a detailed investigation of GFM inverter behavior under both balanced and unbalanced fault conditions, directly linking their responses to inherent operating principles and control strategies. It then examines how the capacity ratio between hybrid GFM and GFL inverters affects stability, power quality, and fault-current availability in an islanded, 100% inverter-based microgrid. Using high-fidelity EMT simulations, the webinar analyzes the authentic dynamic performance of hybrid GFM/GFL inverters during fault events. Overall, the webinar aims to clarify key fault-response characteristics of GFM and hybrid GFM/GFL inverters, offering valuable insights to support commissioning checks, improve post-event diagnostics, and guide the development of robust protection strategies for inverter-dominated grids and microgrids. Presenter bio: Dr. Shuhui Li (Senior Member, IEEE) earned his B.S. and M.S. degrees in electrical engineering from Southwest Jiaotong University in Chengdu, China, in 1983 and 1988, respectively. He obtained his Ph.D. in electrical engineering from Texas Tech University in Lubbock, TX, in 1999. He joined the University of Alabama in Tuscaloosa, AL, in 2006 and is currently a full professor there. He received the IEEE Standards Association’s Emerging Technology Award for his contributions to IEEE Std. 2800-2022. His current research interests include renewable energy systems, power electronics, power systems, electric machines and drives, and the application of artificial intelligence and machine learning in power and energy systems. Dr. Li is a senior member of IEEE and the National Academy of Inventors. He is the chair of the Renewable Technologies Subcommittee and the subgroup lead of the Workforce Initiative of the IEEE Power & Energy Society.

Presented by: Kamal Garg, Ilia Voloh, Pratap Mysore, Pratap Consulting Services, LLC. Gary Kobet, Tennessee Valley Authority This web-based tutorial: Introduces the revised guide IEEE C37.109-2023 Guide for Protection of Shunt Reactors. Tutorial 1- Focus on the basics of shunt reactors, application, design and construction details. Shunt reactor applications can be line or bus connected reactors and tertiary connected reactors. Line connected reactor types and configurations considered include dry-type, oil immersed, wye-connected, directly grounded, or grounded through a neutral reactor. Tertiary connected reactors are dry-type ungrounded Wye connected to the tertiary winding of a power transformer. Presenter’s Publication Topics: Kamal Garg, Schweitzer Engineering Laboratories, Inc. – https://ieeexplore.ieee.org/author/37404985900 Ilia Voloh, GE Vernova – https://ieeexplore.ieee.org/author/37281783600 Pratap Mysore, Pratap Consulting Services – https://ieeexplore.ieee.org/author/38193388200 Gary Kobet, Tennessee Valley Authority – https://ieeexplore.ieee.org/author/38193388200

Presented by: Kamal Garg, Ilia Voloh, Pratap Mysore, Pratap Consulting Services, LLC. Gary Kobet, Tennessee Valley Authority This web-based tutorial: Part 2 of 2 – This session focuses on protection issues, various field events and discussion on protection issues protecting shunt reactors. The tutorial will discuss system considerations and switching issues, focusing on when to trip the reactor breaker only or the line breaker for faults on the line or in the reactor, DC offset and high X/R ratio etc. The presence of the series capacitor on a line and the line shunt capacitance generates subsynchronous oscillations with a shunt reactor which has an impact on the sensitive protection functions. In addition, this tutorial will discuss various industry practices for turn-to-turn faults discussed in IEEE C37.109 2023. Presenter’s Publication Topics: Kamal Garg, Schweitzer Engineering Laboratories, Inc. – https://ieeexplore.ieee.org/author/37404985900 Ilia Voloh, GE Vernova – https://ieeexplore.ieee.org/author/37281783600 Pratap Mysore, Pratap Consulting Services – https://ieeexplore.ieee.org/author/38193388200 Gary Kobet, Tennessee Valley Authority – https://ieeexplore.ieee.org/author/38193388200