Ariel Tavares

Mehdi, I have the same question. @davismont, it would be very helpful to know how to model the driver and the load connected to it to perform dynamic simulations such as fault study and also for power flow purposes, since starting large motors causes low power factor, thus requiring a driver to start these motors. In this sense, how could I model a VFD that feeds a motor modeled as IndMach012?

Thanks, Davis. Those references were really helpful in understanding the fault study mode methodology. However, I still have a question (forgive my ignorance, I'm a beginner electrical engineering student): what type of short-circuit current is provided by the fault study mode report? Comparing it to the short-circuit current graph from IEC 60909-0, what value would it be? Would it be Ik'' (initial symmetrical short-circuit current), ip (peak short-circuit current), or Ik (permanent short-circuit...

Davis, Thanks for the tip I would also like to ask a question about short-circuit studies with OpenDSS. 1- First, I would like to know what is the difference between the short-circuit current values shown in the Fault Study Interface and in the report generated by the "show fault" command. Is it Initial symmetrical short-circuit current Ik" or steady-state short-circuit current Ik or another type of short-circuit current? 2- Second, I would like to know which standard OpenDSS uses to perform short-circuit...

Thank you very much Davis, this was very helpful. Still regarding this project, I would like to clarify a doubt about generators. This electrical system I sent in the attachment is an isolated system powered only by 3 turbo generators. How can I model this system using only the generators as the power source.

Hello Davis, Thanks for your reply. In response to your questions, The purpose of the study is to check the voltage levels on the system busbars, check the load on transformers and cables, and analyze the current profile and maximum currents to size the equipment. The simplified diagram of the system in question is attached.

Hello, I am a beginner and I am trying to model an electrical system of an offshore oil and gas plant in order to perform power flow studies and short-circuit calculations. I need to model a VSD (variable speed driver) as a starting method for large motors and I have not found anything about this in the OpenDSS manual or documents. Could someone help me with this question?