Grid Strength¶
How "stiff" the grid is in response to small perturbations.
Definition by NERC¶
Source: 1
Grid strength is a commonly used term to describe how “stiff” the grid is in response to small perturbations such as changes in load or switching of equipment. While strong grids provide a stable reference source for resources, weak grids can pose challenges for connecting new resources and particularly for connecting inverter-based resources. These resources rely on an adequate grid strength (relative to the size of the resource) for synchronizing the power electronics. In addition, inverter-based resources do not provide significant levels of fault current. While these issues alone do not pose a reliability risk, existing control, and protection paradigms need to be adapted to accommodate these changing characteristics from the generation fleet.
Last modified: 2025-11-29
Related: reliability · short-circuit-ratio · weighted-short-circuit-ratio · composite-short-circuit-ratio · short-circuit-ratio-with-interaction-factors
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NERC (2017). Integrating Inverter-Based Resources into Low Short Circuit Strength Systems. https://www.nerc.com/globalassets/who-we-are/standing-committees/rstc/irpwg/item_4a.integrating-_inverter-based_resources_into_low_short_circuit_strength_systems-_2017-11-08-final.pdf ↩