page_title: Power system simulation
section_title: Transient stability simulation
hierarchical_section_title: Power system simulation / Transient stability simulation
caption_attribution_description: English: Power acceptability curve by CBEMA.
context_page_description: Electrical power system simulation involves power system modeling and network simulation in order to analyze electrical power systems using design/offline or real-time data. Power system simulation software's are a class of computer simulation programs that focus on the operation of electrical power systems. These types of computer programs are used in a wide range of planning and operational situations for:
  Electric power generation - Nuclear, Conventional, Renewable
  Commercial facilities
  Utility transmission
  Utility distribution
  Railway power systems
  Industrial power systems
  Applications of power system simulation include: long-term generation and transmission expansion planning, short-term operational simulations, and market analysis.
  These programs typically make use of mathematical optimization techniques such linear programming, quadratic programming, and mixed integer programming.
  Key elements of power systems that are modeled include:
  Load flow
  Short circuit or fault analysis
  Protective device coordination, discrimination or selectivity
  Transient or dynamic stability
  Harmonic or power quality analysis
  Optimal power flow
context_section_description: The goal of transient stability simulation of power systems is to analyse the stability of a power system from sub-second to several tens of seconds. Stability in this aspect is the ability of the system to quickly return to a stable operating condition after being exposed to a disturbance such as for example a tree falling over an overhead line resulting in the automatic disconnection of that line by its protection systems. In engineering terms, a power system is deemed stable if the substation voltage levels and the rotational speeds of motors and generators return to their normal values in a quick and continuous manner.
  Models typically use the following inputs:
  Number, size and type of generators with any available mechanical, electrical, and control (governor, voltage regulation, etc.) parameters,
  a mix of residential, commercial and industrial load at each bus,
  location and specifications for distributed control devices such as tap-changing transformers, switched shunt compensation, static Var compensators, flexible AC transmission systems, etc.,
  location and specifications for protection devices such as relays and load shedding, and
  location and specifications of any other relevant control and/or protection devices.
  The acceptable amount of time it takes grid voltages return to their intended levels is dependent on the magnitude of voltage disturbance, and the most common standard is specified by the CBEMA curve in Figure. 1. This curve informs both electronic equipment design and grid stability data reporting.
caption: Figure 1. Specifies the acceptable amount of time it takes grid voltages return to their intended levels, which may vary depending on the magnitude of voltage disturbance.
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