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
• Combined RMS and EMT simulation mode (requires Electromagnetic Transients functions (EMT))

• 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
• Nesting of frames and model building blocks
• Fully flexible definition of simulation functions via the DSL syntax
• High precision built-in macros & 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 interface for external models
• Automatic DSL-to-C interface converter
• Support of model pre-compilation for improved performance
• Support of MATLAB/Simulink interface
• OPC interface¹ for real-time applications
• IEEE C37.118 simulation interface for PMU data streaming
• DSL Encryption function²

• Single domain co-simulation (RMS balanced – RMS balanced, RMS unbalanced – RMS unbalanced)
• Multiple domain co-simulation (RMS balanced – RMS unbalanced – EMT³)
• Co-simulation with external solver⁴ (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.

¹This function has to be requested separately.
²Licence for DPL/DSL/QDSL encryption required.
³EMT licence required.
⁴Requires separate „Co-Simulation Interface“ licence.