The multiple-run component includes facilities to record results from each simulation run. Up to six channel inputs (Ch. 1 to Ch. 6) are available to record signals. If more are required, the user may include the Multiple-Run Additional Recording component in the project. Each channel will record a single value per simulation run, based on the input to that channel over the recorded duration. The criteria for determining the recorded value for each channel is selected by the user. The selection can be based on one of the following criteria.
Minimum value of the input over the recording period.
Maximum value of the input over the recording period.
Maximum absolute value (|x|) of the input over the recording period
Integral of X squared (ISE)
The recorded values (Ch. 1 to Ch. 6) can be saved in a multiple run output file, along with the output signals corresponding to that run. The output file name must be specified in the corresponding parameter input field of the component.
NOTE: The Output Channel component for recording of output quantities can be used to save the complete time waveform for each run (which can lead to a large number of output files).
One of the above measured quantities can also be specified as the channel for determining the optimum run. The optimum selection can be based on minimum (Min) or maximum (Max) criteria. The selected channel will be observed for each run, and the run which is determined as the optimum will be repeated after all runs are completed.
APPLICATION EXAMPLE (multiple_run_example_2.pscx):
Line Energizing Overvoltage: Closing the transmission line breaker at various times (Point on Wave) to determine the worst overvoltage and the peak energy dissipation of the surge arrester at the open end of the line. A single variable (i.e. the time of breaker closing) is to be varied from 0.5 to 0.516 s (1 cycle of 60 Hz). It is desired to find the case that caused the worst overvoltage on either phase A, B or C. 300 Point on Wave switching instants are specified.
Four monitoring channels should be specified: One for each of the 3 voltages and one to record the surge arrester energy.
Auto-processing can be the max(|X|) for each channel. The Meas-Enab input signal should be zero before the fault, and 1 during and after the fault.
Multiple run additional recording: Application of this component is demonstrated in this example. The line voltage at the breaker end are recorded using this component.
NOTE:: Also see PSCAD Cookbook examples under faults and Line energizing