Current limiters are the first line of defense during grid disturbances. These devices regulate the flow of electrical current, ensuring it remains within safe operational limits. There are three main approaches to current limiting in GFM inverters: direct, indirect, and hybrid. . This document explores GFM inverters and how they can help stabilize the future grid, especially during disturbances and contingencies. It summarizes a two-year research and development fellowship program at NREL. We point interested readers to more detailed works developed during the project along. . fast and programmable control responses. However, inverters are sub ect to significant physical constraints. One such constraint is a current magnitude limit r quired to protect semiconductor devices. While many current limiting methods are available, they can often unpredictably alter the behavior. . Figure 1: GFM inverters require an additional fault current management system to limit overcurrent and ensure stability during a disturbance Unlike their synchronous-generator counterparts, which can handle high fault currents due to their high thermal inertia, GFM inverters are far more sensitive. . Abstract—Grid-forming (GFM) inverters are increasingly rec-ognized as a solution to facilitate massive grid integration of inverter-based resources and enable 100% power-electronics-based power systems. Existing approaches either simply saturate a controller that is designed for unconstrained systems, or assume small perturbations and linearize. .
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