EMT simulation represents the power system in the time domain and provides instantaneous value results.
EMT simulation is ideal, and in many cases necessary, for the detailed study of the power system’s response to disturbances over a wide frequency range.
EMT simulation allows for a greater depth of analysis than phasor domain (RMS) representations such as load flow or transient stability analysis. This is particularly important for modern systems with many power electronic converters.
The RTDS Simulator is capable of multi-rate simulation, in which different subnetworks of the simulation run at different fixed simulation timesteps. The ability to run numerically stable multi-rate power system simulation has many advantages.
Entire circuits can be modelled in the main timestep, Substep (reduced timestep and increased hardware requirement), or Superstep (increased timestep and reduced hardware requirement) environments. The user may choose to use multi-rate simulation if they wish to reduce the quantity of simulation hardware required to represent larger networks.
The RTDS Simulator’s Substep environment uses a predictive switching algorithm to enable the high-fidelity simulation of voltage source converters switching in the 50 kHz range. Circuit topology is user-configurable.
Data is exchanged between the Substep environment and the AC network every main timestep, allowing for the impact of converter-connected generation or HVDC and FACTS devices on the main network to be studied in detail.
The RTDS Simulator’s Superstep environment allows the user to represent a portion of the network with a larger timestep, retaining the detail of EMT simulation but significantly reducing the simulation hardware required.