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Hierarchical Data-Driven Protection for Microgrid with 100% Renewable Penetration: Preprint
The accurate detection and isolation of faults is critical for the reliable operation of microgrids (MGs). Traditional protection approaches are even more challenged for 100% renewable MGs because inverter-based resources (IBRs) are the only sources for fault current which are usu...
Zamzam, A. and Wang, J. NLR
Oct 31, 2023
Operation of Grid Forming Converters as Self Excited Induction Generators Under Non-Ideal Loading Conditions
Self-excited induction generators offer a robust solution for power production for standalone as well as grid-connected systems. In general, self-excited induction generators require excitation capacitors which make use of the machine magnetization characteristics for voltage buil...
Roy Chowdhury, V. and Mather, B. NLR
Dec 31, 2023
Decentralized Microgrid Protection Through Relative Fault Direction Classification: Preprint
Protection in inverter-based resources (IBRs) dominated microgrids generally face significant challenges due to the low fault current and inconsistent fault behaviors from IBRs. Recently, machine learning-based approaches have attracted considerable attention to address these chal...
Chen, Y. et al NLR
Aug 31, 2024
A Guide to Updating Interconnection Rules and Incorporating IEEE Std 1547-2018
This NREL resource provides a roadmap for revising interconnection rules and standards to incorporate the provisions of IEEE Std 1547-2018. It discusses key changes in the standard including ride-through, reactive power control, and communications and offers recommendations for up...
Ingram, M. et al NLR
Sep 30, 2021
A Primer on the Unintentional Islanding Protection Requirement in IEEE Std 1547-2018
This primer provides an accessible explanation of the unintentional islanding protection provisions in IEEE Std 1547-2018. It describes why preventing unintentional islanding is critical, outlines testing and detection methods, and clarifies performance requirements for distribute...
Narang, D. et al NLR
Mar 31, 2022
Cybersecurity Certification Standard for Distributed Energy and Inverter-Based Resources
NREL and UL co-presented on their joint effort to develop a cybersecurity certification standard for distributed energy resources (DERs) at a meeting of the Cybersecurity Advisory Team for State Solar (CATSS). The advisory team is hosted by NASEO and NARUC. The presentation outlin...
Saleem, D. and Slowinske, M. NLR
Jan 23, 2022
New Approaches to Distributed PV Interconnection: Implementation Considerations for Addressing Emerging Issues
This report discusses innovative approaches to distributed photovoltaic (PV) interconnection aimed at addressing emerging issues such as high penetrations, rapid interconnection requests, and evolving standards. It examines options like hosting capacity analysis, flexible intercon...
McAllister, R. et al Western Interstate Energy Board
Jan 31, 2019
Microgrid Controller Survey Report: 2024 Update
In the past decade, the number of microgrids deployed by electric utilities, end-use customers, and third parties has been increasing significantly both in the US and worldwide. The increase is driven by various reasons, such as carbon emission reduction, energy efficiency improve...
Liu, G. and Starke, M. Oak Ridge National Laboratory
Mar 31, 2024
Use of Traveling Wave Signatures in Medium-Voltage Distribution Systems for Fault Detection and Location
Protection systems are a critical feature for the proper operation of a power grid. Protection systems should be able to quickly detect, identify, locate, and isolate the faults within a time frame that prevents damage to grid components and reduces customer outages. As more inver...
Prabakar, K. et al NLR
Jul 31, 2021
Advanced Distributed Wind Turbine Controls Series
Documents and analyses that detail control strategies for distributed wind to provide services beyond energy. Using a reference campus model, the resources cover isolated-grid operation, fault-ride-through in grid-connected deployments, and support for microgrid transitions and bl...
Anderson, B. et al NLR
Dec 31, 2021
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