Hi everyone,
I am running dynamic simulation for a case study. Even before applying any disturbance, I see oscillations in plots for voltages, etc. which then settle at steady-state values after about 15 seconds.
The initial conditions check comes okay when the dynamic simulation is initialized. What, then, am I missing?
Any help will be highly appreciated.
Check if you have small generator with classic gen model and no controller modelled(exciter,gov,pss ....). Draw the ouput of those units and check.
Update: The network had a user model for HVDC, and that's what was causing the issue. I replaced the model with a generic model and the oscillations went away. I am wondering what could be wrong with the user model since I don't have access to its source code.
If you have SVCs and/or Statcoms in the case, plot their output. Their Q may be changing during initialization.
Check progress window for messages during the simulation.
Use activity Compare (DIFF) to compare the load flow after 15 s simulation with the original saved case to see if there are any changes in bus voltages or line flow. This may indicate what is going on in the simulation.
Asked: 2021-08-27 09:49:26 -0500
Seen: 773 times
Last updated: Oct 08 '21
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How big are the oscillations? What are the d-states?