Transient stability

The transient stability section of IPSA enables the user to simulate the dynamic response of an electrical power system to fault, machine and branch switching disturbances, using the step-by-step method and starting from a specific balanced operating condition.transient1

Note: UDM refers to the User-defined Modelling tool

  • Uses dynamically adaptive time step
  • Synchronous machine modelling
    • Full DQ sub-transient, transient, and synchronous representation
    • Standard exciters, AVRs and governors
    • Custom controlled (AVR and governor) modelling using UDM or Plug-ins
    • Multi-mass shafts with standard and UDM or Plug-in governors
  • Induction machine modelling
    • Polynomial representation of turbine mechanical torque
    • UDM or Plug-in modelling for multi-mass shafts
    • UDM or Plug-in modelling for complex torque/speed characteristics
    • under voltage drop-out
    • lock-out time
    • over-speed
    • under-speed
  • Wind turbine modelling
    • Polynomial representation of turbine mechanical torque
    • Default DFIG rotor converter control
    • Default rotor converter over-current protection
    • UDM or Plug-in modelling for pitch-control and multi-mass shafts
    • UDM or Plug-in modelling for rotor converter controllers
    • under voltage drop-out
    • over-speed
    • under-speed
  • Universal machine modelling
    • Developed for converter modeling but multi-purpose
    • Transient response specified as UDM or Plug-in controllers
    • Current injection on system reference frame
    • Current injection on DQ reference frame
    • Power injection
  • Mechanically switched capacitor banks
    • Controllers using UDM or Plug-ins
  • Static VAr compensators
    • Controllers using UDM or Plug-ins
  • Full AC / DC networks modelling
    • Line commutation and PWM
    • Controllers using UDM or Plug-ins
    • DC machines
    • Batteries
  • Branch switching
    • Sending end open/close
    • Receiving end open/close
    • Both ends open/close
  • Modelling of overcurrent protection device operation
  • Results plotted in real time as analysis progresses
    • User choice over the plotted values
  • Results optionally saved to file for later plotting / retrieval