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