{
  "$schema": "https://ps-wiki.github.io/schema/v1/term.schema.json",
  "id": "voltage-stability",
  "title": "Voltage Stability",
  "description": "The ability of a power system to maintain steady voltages close to nominal value.",
  "language": "en",
  "tags": [
    "stability",
    "ieee",
    "ieee-task-force",
    "article",
    "european-union",
    "europe",
    "China"
  ],
  "related": [
    "stability",
    "frequency-stability",
    "rotor-angle-stability",
    "n-situation"
  ],
  "breaking": false,
  "dates": {
    "created": "2025-03-15",
    "last_modified": "2026-01-18"
  },
  "authors": [
    {
      "name": "Jinning Wang",
      "url": "https://jinningwang.github.io"
    }
  ],
  "content": {
    "sections": [
      {
        "order": 1,
        "id": "definition-in-an-article-by-a-task-force",
        "title": "Definition in an Article by a Task Force",
        "type": "definition",
        "source_keys": [
          "hatziargyriou2021stability"
        ],
        "page": null,
        "body_md": "> Voltage stability refers to the ability of a power system to maintain steady voltages close to nominal value at all buses in the system after being subjected to a disturbance.\n\n> Short-term voltage stability involves dynamics of fast acting load components such as induction motors, electronically controlled loads, HVDC links and inverter-based generators. The study period of interest is in the order of several seconds, similar to rotor angle stability or converter-driven stability (slow interaction type). Accordingly, models with the same degree of detail as for the above stability classes must be used. In addition, for short-term voltage stability, the dynamic modeling of loads is essential, and short circuit faults near loads are the main concern.\n\n> Long-term voltage stability involves slower acting equipment such as tap-changing transformers, thermostatically controlled loads, and generator current limiters. It usually occurs in the form of a progressive reduction of voltages at some network buses. The maximum power transfer and voltage support are further limited when some of the generators hit their field and/or armature current time-overload capability limits. The study period of interest may extend to several minutes, and long-term simulations are required for analysis of system dynamic performance.\n"
      },
      {
        "order": 2,
        "id": "definition-in-a-european-union-regulation",
        "title": "Definition in a European Union Regulation",
        "type": "definition",
        "source_keys": [
          "eu2017guideline"
        ],
        "page": "p6",
        "body_md": "> 'voltage stability' means the ability of a transmission system to maintain acceptable voltages at all nodes in the transmission system in the N-situation and after being subjected to a disturbance;\n"
      },
      {
        "order": 3,
        "id": "definition-in-china-grid-operation-code",
        "title": "Definition in China grid operation code",
        "type": "definition",
        "source_keys": [
          "gbt2022"
        ],
        "page": "p8",
        "body_md": "> 电压稳定：电力系统受到扰动后，系统电压能够保持或恢复到允许的范围内，不发生电压崩溃的能力。\n\nTranslation:\n\nVoltage Stability: The ability of a power system to maintain or restore system voltage within an allowable range after being subjected to a disturbance, without the occurrence of voltage collapse.\n"
      }
    ]
  }
}