NEPLAN | Characteristics

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The NEPLAN Dynamic Simulator is one of the most advanced tool for dynamic simulations on the market. It includes the following four different types of calculation:

  • RMS (Transient Stability simulation), in DQ0 and ABC reference frame
  • EMT (Electromagnetic Transients simulation), in DQ0 and ABC reference frame

All necessary models and simulation methods are integrated with a very high accuracy and performance.

The NEPLAN Dynamic Simulator implements a unique mathematical framework for large-scale, nonlinear system with fast/slow continuous and discrete (hybrid) systems.  The automatic and sophisticated built-in initialization algorithms avoid struggling with any kind of initialization procedure. The adopted structure gives also very high flexibility in creating userdefined models.


  • Short-term, mid-term and long-term dynamic simulations
  • Machine dynamics and startup simulations
  • Angle stability with several different type of regulators
  • HVDC-(light), FACTS, SVC design and regulation
  • Load shedding and protection schemes
  • Automatic generation control (AGC)
  • Sub-synchronous resonance with EMT simulation
  • PSS tuning with Eigenvalue and Sensitivity analysis

Protection Devices

  • Min-max relays (overcurrent, undervoltage, frequency, etc.): modeled with up to 4 tripping stages, with the possibility of any desired event (switching in/off an element, increase/decrease load, loss of excitation, …). Various load shedding schemes can be easily simulated
  • Overcurrent relays and fuses
  • Pole slip relays, including binary input signals from external sources
  • Distance protection with any characteristic: pickup and tripping stages, impedance diagrams, binary input signals from external sources
  •  User defined protections described by equations or function blocks


  • Possibility of defining and saving various disturbance groups, with different single event per case
  • Definition of  different faults (symmetrical and unsymmetrical) on buses, bus elements, branches
  • Different switching operations (feed-forward control in control circuits, cross coupling of protective devices, in/out of branches, etc.)
  • Loss of generator excitation
  • Start-up of motors with different start-up devices
  • Transformer tap modification
  • Load shedding scenarios (even in relation with frequency relay)
  • Disturbances with function activation (step, ramp, sinusoidal function or combination)
  • User-defined disturbances (every variable can be modified in the network/control)