EMTDC features the ability to automatically perform multiple simulations on the same case, while changing one or more variables each run. For example, in non-linear models such as DC transmission links, it is possible that control system gains and time constants can be sequentially or randomly searched to find an optimum response to a disturbance. Similarly, if a transmission line is being switched, or a transformer is to be energized, a search for peak voltages can be undertaken by varying point on wave switching.
Depending on the amount of variables sequenced, this feature can be time consuming, and may need to be relegated to overnight or over the weekend computations. Nonetheless, it is a powerful technique, especially when peak values or optimum performance of highly non-linear systems is being sought after.
Multiple Runs can be performed by three methods:
Using the Multiple Run component
Using the Optimum Run component
Manually defining the multiple run variables
If one of the components is used, it will automatically set the number of runs depending on the selected variation method. More than one these components can exist in the same circuit, as long as only one of them is enabled.