Variables in dynamic simulation

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Because PSSE does a DC approximation, you will not be able to observe any sinusoidal behaviour.

The output file created after dynamic simulation has RMS quantity , which can be observed in PSSE Chop or output window.

In my humble opinion, the voltage output of PSSE is not instantaneous value, but approximation of Vrms (root mean square value). Also P,Q,I... are quadratic means. I haven't seen any channel that get instantaneous value.

Hi Yu, that is an interesting question. It is true that we don't see the sinusoidal voltage in PSSE, as the output voltage when channeling out a voltage quantity is per unit (p.u.) value. The way power systems simulation tools such as PSSE, PSLF are written is different from other tools such as ETAP, PSCAD MATLAB Simulink etc. which are more focused towards phasor analyses, imbalanced networks simulations. PSSE and PSLF are good if you have to conduct simulations on large network ( could be thousands of buses ) to investigate system-wide behavior. PSSE/ PSLF use state estimation techniques ( "initializing" the case) and calculate variables much faster. Other software can work If you are interested in knowing localized impacts such as voltage waveform of each phase, using PSCAD , MATLAB Simulink etc would be recommended.