Electromagnetic Transients (EMT)

PowerFactory provides an EMT simulation kernel for solving power system transient problems such as lightning, switching and temporary over-voltages, inrush currents, ferro-resonance effects or sub-synchronous resonance problems. Together with a comprehensive model library, a graphical, user-definable modelling system (DSL), and options for co-simulation, it provides an extremely flexible and powerful platform for solving power system electromagnetic transient problems.

  • Integrated simulation of electromagnetic transients in multiphase AC and DC systems
  • Fast, fixed step size or adaptive step size algorithm
  • Simulation of static var compensations (SVC), thyristor controlled series compensations (TCSC), FACTS, STATCOM, etc.
  • Modelling of HVDC interconnections (rectifier/inverter, two-level VSC, half- and full-bridge MMC converter)
  • Power electronic devices and discrete components (diode, thyristor, PWM converter, rectifier/inverter, DC valve, soft starter, etc.)
  • Constant and frequency-dependent distributed parameter OHL models, universal frequency dependent cable model
    • OHL/Cable constants calculation
    • OHL transpositions
    • Single/multi-core and pipe-type cables
    • Cable cross-bonding
    • Semi-conducting layers
  • Non-linear elements and saturation characteristics, including definition of hysteresis
  • Series capacitors incl. spark gap model
  • Surge arrestor models
  • Impulse voltage & current source for lightning surge analysis
  • Support of AC-DC inter-circuit fault events
  • Accurate EMT models of renewable generation (wind/PV, etc.) and storage systems
  • Discrete R-L-C elements
  • Flexible template definition to create and re-utilise user-specific models library
  • Insulation coordination analysis including temporary (TOV), switching (SOV) and lightning (LOV) transient over-voltages
  • Stochastic switching analysis and point-on-wave (POW) switching
  • Frequency Analysis Tool, including Fast Fourier Transform (FFT) and Prony Analysis for single point in time as well as time-range assessment
  • Inrush, ferro-resonance, SSR and TRV studies
  • COMTRADE file support
  • Various options for triggering breaker close events
  • Combined RMS and EMT simulation mode (Requires Stability Analysis functions (RMS) licence)

DIgSILENT Simulation Language (DSL) for EMT Modelling

  • Contains the DIgSLENT Simulation Language for dynamic modelling (see RMS module for details)

Co-Simulation Functionality

  • Single domain co-simulation (RMS balanced – RMS balanced, RMS unbalanced – RMS unbalanced)
  • Multiple domain co-simulation (RMS balanced – RMS unbalanced – EMT[1])
  • Co-simulation with external solver[2] (e.g. third party power systems ­simulation program) via IEEE C37.118 communication interface
  • Computing supported as built-in for increased performance
  • Both accurate (implicit) and fast (explicit) co-simulation methods ­available
  • Easy to define co-simulation border using boundary objects
  • Any number of co-simulation regions can be defined
  • Co-simulation of networks split by regions depending on any criteria: localisation, voltage levels, etc.

[1] RMS licence required
[2] Requires separate „Co-Simulation Interface“ licence