2026 Event Schedule

The proliferation of Inverter-Based Resources (IBRs) introduces significant challenges to effective grounding, primarily due to their distinct characteristics compared to traditional synchronous generators. A key concern is Ground Fault Overvoltage (GFOV), which can occur on un-faulted phases when IBRs become islanded, stressing grid equipment. This necessitates a re-evaluation of classical grounding practices, as they are often incompatible with IBR behavior. Furthermore, the necessary supplemental grounding for IBRs can introduce undesirable side effects, including desensitizing upstream protection relays, leading to nuisance tripping, increasing fault currents causing additional overvoltage and ground potential rises.

This course covers essential grounding principles, existing practices, and challenges introduced by Inverter-Based Resources (IBRs) in distribution systems. It explores advanced modeling, fault analysis (including GFOV), supplemental grounding, and evolving interconnection standards, aiming to equip professionals for a reliable and cost-effective grid.

The key topics that will be covered in this course are:

• Core grounding concepts, existing schemes and practices, and their fundamental importance to ensure grid safety and reliability.
• Critical operational and fault response distinctions between IBRs and traditional synchronous generation, explaining why these necessitate new grounding considerations.
• Inverter architecture and grid interaction, including Voltage-Controlled vs. Current-Controlled designs and their influence on system behavior.
• EMT modeling for the distribution grid. Demonstrate how to integrate RMS models and diverse data sources for accurate IBR-centric transient and fault analysis.
• Analysis of ground fault challenges, specifically focusing on Ground Fault Overvoltage (GFOV), the roles of transformers and loads as ground sources, and apply sequence network analysis.
• Impact of interconnection transformer configurations on system grounding and IBR performance during normal and abnormal grid conditions.
• Overvoltage tolerance for end-user loads and medium-voltage equipment, including strategies for effective protection against overstress.
• Negative impacts, necessity, and size considerations for supplemental grounding in IBR installations.
• Interconnection standards (e.g., IEEE/ANSI C62.92 series) and proposed updates related to effective grounding requirements.
• Present case studies to illustrate practical challenges and effective solutions in IBR interconnection projects.