Symptom

Cause

Possible solution

The simulation does not start in steady-state

Incorrect initialization

Set limits of controllers to the maximum value (for instance, for the excitation system of a synchronous generator)

An event starts at time 0

Check the dynamic case

Network contains induction machines*

The system will finally reach equilibrium, so just set the start time of an event after this moment.

Numerical instability

Maximum time step is too large

Change Maximum time step on Dynamic analysis | Advanced

Tolerance is too large

Change tolerance on Dynamic analysis | Advanced

Short cables with small shunt capacitances

Neglect cable capacitances of short cables via: Dynamic analysis | Advanced | Neglect capacitances of cables. Or represent the respective lines/cables without shunt capacitances.

Slow simulation

Maximum time step is too small

Change Maximum time step on Dynamic analysis | Advanced

Tolerance is too small

Change tolerances on Dynamic analysis | Advanced

Network contains too many elements

Represent parts of the network by equivalents

Set checkbox Parallel Jacobian on Dynamic analysis | Advanced

Set checkbox Eliminate links on Dynamic analysis | Advanced

Short cables with small shunt capacitances

Neglect capacitances of short cables via: Dynamic analysis | Advanced | Neglect capacitances of cables. Or represent the respective lines/cables without shunt capacitances.

Range check error

Internal

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