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Grun is a tool to evaluate governor response to a step change in loading. It can be useful for evaluating governor control parameters.
- in the governor response window select the bus number of the machine to be tested. If there are multiple machines at the bus and you only want to test one make sure the others are off.
- select some initial loading in pu. and step size.
- I usually run for 10 sec and look at the Pmech and Speed response to the step change in loading.
From these results you can determine things like ramp rate, % overshoot, rise time, settling time, and steady-state error that can help evaluate your governor control parameters. By exporting the results to a csv file you can use something like MS Excel to calculate these results. I would try to play around with initial loading and step size to see how your governor deadband changes the results. (ie. what is the largest step size that results in no change in output from the governor response test?) In my experience governor deadbands can be quite small.
