Stability Analysis Functions (RMS)

The RMS simulation tool in PowerFactory can be used to analyse mid-term and long-term transients under both balanced and unbalanced conditions, incorporating a simulation scan feature.  DIgSILENT Simulation Language (DSL) is used for model definition, and a large library of IEEE standard models is available. Flexible co-simulation options are also available.

  • Multi-phase AC networks, DC networks
  • Support of balanced and unbalanced grid conditions
  • Fast, fixed step size and adaptive step size algorithm
  • A-stable numerical integration algorithms supporting long-term stability simulations with integration step sizes ranging from milliseconds to minutes, individually selectable for each model
  • High precision event and interrupt handling
  • Simulation of any kind of fault or event
  • Transient motor starting (synchr./asynchr. machines)
  • Support of all protection library relays
  • Real-time simulation mode
  • Simulation scan feature, e.g. frequency scan, loss of synchronism scan, synchronous machine speed scan, voltage-/voltage recovery scan, fault ride through scan or common variable scan
  • Frequency Analysis Tool, including Fast Fourier Transform (FFT) and Prony Analysis for single point in time as well as time-range assessment
  • Frequency Response Analysis tool for dynamic models with Bode/Nyquist plots

User-Defined Dynamic Models

  • DIgSILENT Simulation Language (DSL) for Dynamic RMS Modelling
    • Graphical editor for drawing any kind of block diagram (AVR, prime mover, relay, etc.)
    • Fully flexible signal wiring schemes having access to any grid object and their parameters via definition of Frames
    • Support of vector signals and signal multiplexing
    • Nesting of frames and model building blocks
    • Fully flexible definition of simulation functions via the DSL syntax
    • High precision built-in macros and functions
    • Automatic initialisation of complex, non-linear models
    • Configuration scripts for initialisation using DPL
    • Large built-in standard model library, including IEEE and CIM ENTSO-E models
    • Generic C interface for user-defined controller models
    • IEC61400-27-1 Ed. 1 Appendix F DLL based interface for external models
    • Automatic DSL-to-C interface converter
    • Support of model pre-compilation for improved performance
    • OPC interface1 for real-time applications
    • IEEE C37.118 simulation interface2 for PMU data streaming
    • DSL Encryption function3
  • Modelica Simulation Language
    • Support of Modelica Simulation Language for discrete-time models
  • Integration of external models using FMI (Functional Mock-up Interface)
    • Support of Functional Mock-Up Unit (FMU) import for Model Exchange
    • FMU export of Modelica models4

Co-Simulation Functionality

  • Single domain co-simulation (RMS balanced – RMS balanced, RMS unbalanced – RMS unbalanced)
  • Multiple domain co-simulation (RMS balanced – RMS unbalanced – EMT5)
  • Co-simulation with external solver6 (e.g. third party power systems ­simulation program) using FMI 2.0 (Functional Mock-Up Interface)
  • Computing supported as built-in for increased performance
  • Both accurate (implicit) and fast (explicit) co-simulation methods ­available
  • Support of multi-port Norton/Thevenin remote network equivalents for explicit method
  • 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.

1This function has to be requested separately
2C37 Simulation Interface licence required
3Licence for DPL/DSL/QDSL encryption required. Encryption Function licence. DIgSILENT does not give any express warranties or guarantees for cryptographic security of encrypted models. In particular, DIgSILENT does not guarantee that the details and functionalities of an encrypted model are secure against all means of access or attack attempts.
4Requires FMU Model Export licence
5EMT licence required
6Requires separate Co-Simulation Interface licence