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Frequency response test

Hello,

I have a frequency step test, dynamics study.

In Power World, one is able to simulate a frequency step test by changing the frequency at the slack generator.

In PSS/E, I couldn't find an equivalent 'disturbance' to emulate a frequency step test. The closest I found is the GRef, but I understand that changes the Pmech of a generator directly, instead of emulating a frequency step change. Is this correct? Or does PSS/E have a frequency step function similar to Power World?