{
  "$schema": "https://ps-wiki.github.io/schema/v1/term.schema.json",
  "id": "grid-strength",
  "title": "Grid Strength",
  "description": "How \"stiff\" the grid is in response to small perturbations.",
  "language": "en",
  "tags": [
    "reliability",
    "nerc"
  ],
  "related": [
    "reliability",
    "short-circuit-ratio",
    "weighted-short-circuit-ratio",
    "composite-short-circuit-ratio",
    "short-circuit-ratio-with-interaction-factors"
  ],
  "breaking": false,
  "dates": {
    "created": "2025-11-29",
    "last_modified": "2025-11-29"
  },
  "authors": [
    {
      "name": "Jinning Wang",
      "url": "https://jinningwang.github.io"
    }
  ],
  "content": {
    "sections": [
      {
        "order": 1,
        "id": "definition-by-nerc",
        "title": "Definition by NERC",
        "type": "definition",
        "source_keys": [
          "nerc2017integrating"
        ],
        "page": null,
        "body_md": "> 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.\n"
      }
    ]
  }
}