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Black Start of Unbalanced Microgrids Harmonizing Single and Three-Phase Grid-Forming Inverters: Preprint
As power systems are transforming with increasing penetrations of inverter-based resources (IBRs), system restoration using IBRs has drawn attention. Using distributed grid-forming (GFM) assets located near critical loads, either three-phase or single-phase, to establish microgrid...
Seo, G. et al NLR
Jul 31, 2023
Grid Application and Controls Development for Medium-Voltage SiC-Based Grid Interconnects: Preprint
In this paper, the grid-interconnection requirements of directly connected medium voltage (MV) SiC-based converters are studied and the necessary control implementations are detailed. These power electronic converters use the interconnection standard IEEE 1547-2018, but can also h...
Singh, A. et al NLR
Sep 30, 2020
Study of Seamless Microgrid Transition Operation Using Grid-Forming Inverters
This paper investigates operational techniques to achieve seamless (smooth) microgrid (MG) transitions by dispatching a grid-forming (GFM) inverter. In traditional approaches, the GFM inverter must switch between grid-following (GFL) and GFM control modes during MG transition oper...
Wang , J. et al NLR
Dec 31, 2022
Study of Inverter Control Strategies on the Stability of Microgrids Toward 100% Renewable Penetration: Preprint
This paper investigates microgrid transient stability with mixed generation synchronous generator (SG), grid-forming (GFM) and grid-following (GFL) inverters under increasing penetration levels toward a 100% renewable generation microgrid. Specifically, the dynamics of a microgrid...
Wang, J. NLR
Jul 31, 2022
Design Power Control Strategies of Grid-Forming Inverters for Microgrid Application
This paper develops and compares two control schemes in the application control layer of a non-phase-locked loop (non-PLL) grid-forming (GFM) inverter to gain insight and understanding into how the two schemes affect the dynamic responses of GFM inverters and the transition operat...
Wang, J. NLR
Dec 31, 2020
Study of Inverter Control Strategies on the Stability of Low-Inertia Microgrid Systems
This paper investigates the stability of low-inertia microgrid systems with two control strategies that have different percentages of grid-forming (GFM) inverters. The first control strategy has approximately 50% GFM inverters, and all the battery inverters are working in GFM con...
Wang, J. and Saraswat, G. NLR
Dec 31, 2021
Dispatching Grid-Forming Inverters in Grid-Connected and Islanded Mode
This paper explores the dispatchability of grid-forming (GFM) inverters in grid-connected and islanded mode. GFM inverters usually use droop control to automatically share power with other GFM sources (inverters and synchronous generators) and follow the change in the load demand;...
Wang, J. et al NLR
Dec 31, 2023
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
Integrated Synchronization Control of Grid-Forming Inverters for Smooth Microgrid Transition
This paper develops an integrated synchronization control technique for a grid-forming inverter operating within a microgrid that can improve the microgrid's transients during microgrid transition operation. This integrated synchronization control includes the disconnection synchr...
Wang, J. et al NLR
Jul 31, 2019
The U.S. Department of Energy’s Microgrid Initiative
This Department of Energy report outlines the objectives and progress of the Microgrid Initiative led by the Office of Electricity Delivery and Energy Reliability. It summarizes research and development efforts aimed at advancing microgrid technologies, including standardized cont...
Ton, D. and Smith, M. U.S. Department of Energy
Sep 30, 2012
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