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Design of a Non-PLL Grid-Forming Inverter for Smooth Microgrid Transition Operation
This paper develops a controller for a grid-forming (GFM) inverter that is capable of operating as either a GFM or grid-feeding source that can improve the operation of a microgrid during on-off grid transitions through use of a novel synchronization approach. Furthermore, this co...
Wang, J. et al NLR
Aug 01, 2020
Performance Evaluation of Peer-to-Peer Distributed Microgrids Coordination for Voltage Regulation
This paper presents the performance evaluation of a peer-to-peer microgrids coordination algorithm for sub-transmission systems. As distributed energy resources (DERs) in distribution system start to show negative impact to the bulk power system, a paradigm shift is needed for tra...
Gan, H. et al NLR
Dec 31, 2021
Black-Starting Microgrids Using Inverter-Based Distributed Energy Resources
Recent trends in power systems show increasing deployment of inverter-based distributed energy resources (DERs) at the distribution level. Efforts have also been made to use inverter-based DERs for system restoration of critical sections of distribution feeders. In the past few ye...
Sawant, J. et al NLR
Dec 31, 2024
Evaluation of Optimal Net Load Management in Microgrids Using Hardware-in-the-Loop Simulation
This paper presents the performance evaluation of a net load management (NLM) engine that balances load and generation in an isolated community to power a critical facility after a grid interruption event (e.g., the loss of a large generation unit). This NLM engine is particularly...
Wang, J. et al NLR
Dec 31, 2021
Flexible Operation of Microgrids Through Operator-Configurable Microgrid Controllers
Microgrids are becoming critical assets in power distribution systems. This is partly due to the resiliency and reliability challenges faced by power distribution systems in the last decade and partly due to the increased integration of distributed energy resource assets, such as ...
Curtiss, P. et al SandC Electric Company
Dec 31, 2024
A Novel Power-Hardware-in-the-Loop Interface Method for Grid-Forming Inverter Systems
Power-hardware-in-the-loop (PHIL) simulations of grid-forming (GFM) inverter systems facilitate the testing of drastic scenarios, such as on-grid to off-grid transitions and islanded microgrid operations without a stiff grid. To the authors' best knowledge, most studies in the lit...
Chakraborty, S. et al University of Minnesota
Dec 31, 2021
Cyber Security Primer for DER Vendors, Aggregators, and Grid Operators
This report provides an introduction to cyber security for distributed energy resources (DER)—such as photovoltaic (PV) inverters and energy storage systems (ESS). This material is motivated by the need to assist DER vendors, aggregators, grid operators, and broader PV industry ...
Carter, C. et al Sandia National Laboratories
Jul 31, 2017
Universal Passive Synchronization Method for Grid-Forming Inverters Without Mode Transition
Power systems are transforming with increasing levels of inverter-based resources (IBRs). This transformation requires critical roles of grid-forming (GFM) inverters replacing synchronous generators for bulk power system stabilization and ancillary services, also allowing flexible...
Chang, H. et al NLR
Dec 31, 2022
Evaluation of Distributed Power Apportioning with Net Load Management Engine in Microgrids Using Power Hardware-in-the-Loop Simulation
This article presents the performance evaluation of ratio consensus-based distributed power apportioning engine along with centralized net load management (NLM) engine that ensures viable and stable operation of an islanded microgrid. Managing net load variability in a microgrid w...
Chakraborty, S. et al University of Minnesota
Dec 31, 2022
SVM-Based Synchronized Fault Detection for 100% Renewable Microgrids
Traditional protection schemes face significant challenges when applied to microgrids with high penetrations of renewables with inverter-based resources (IBRs). The proliferation of advanced sensing and communication technologies has generated copious data, offering an opportunity...
Chakraborty, S. et al NLR
Dec 31, 2024
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