NEPLAN Characteristics

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.

Applications

• 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
•  Userdefined protections described by equations or function blocks

Disturbances

• 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)