{
  "$schema": "https://ps-wiki.github.io/schema/v1/term.schema.json",
  "id": "small-signal-stability",
  "title": "Small Signal Stability",
  "description": "The ability to maintain synchronism when subjected to small disturbances.",
  "language": "en",
  "tags": [
    "stability",
    "book"
  ],
  "related": [
    "dynamic-stability",
    "participation-factors"
  ],
  "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-a-textbook",
        "title": "Definition in a Textbook",
        "type": "definition",
        "source_keys": [
          "kundur1994Power"
        ],
        "page": "p699, first edition",
        "body_md": "> Small-signal stability, as defined in Chapter 2, is the ability of the power system to maintain synchronism when subjected to **small disturbances**. In this context, a disturbance is considered to be **small** if the equations that describe the resulting response of the system may be **linearized** for the purpose of analysis. Instability that may result can be of two forms:\n> (i) steady increase in generator rotor angle due to lack of synchronizing torque, or\n> (ii) rotor oscillations of increasing amplitude due to lack of sufficient damping torque.\n> In today’s practical power systems, the small-signal stability problem is usually one of insufficient damping of system oscillations.\n> Small-signal analysis using linear techniques provides valuable information about the inherent dynamic characteristics of the power system and assists in its design.\n\nThe term \"small-signal stability\" is sometimes used interchangeably with \"small-disturbance stability\" in the context of power system stability.\n"
      }
    ]
  }
}