Jorge's profile - activity

Hi, You want to record VARs L+2 for the real current command (Ipcmd) and L+3 Reactive current command (Iqcmd) in your python script.

I hope that helps!

Sorry to barge in but I have also experienced the same effect, only that it is when I use an user defined model similar to the PLBVFU.

I am manipulating the frequency at the POI and I leave the voltage singal unmodified and I see a similar effect, the voltage drops in proportion to the frequency.

If you don't mind me asking, what would be the physical explanation (if any) for this effect? and why does increasing the reactance of the generator at the swing bus appears to help?

Thanks!

Jorge

I would suggest you have a look at the WECC documentation, in the following link there are some typical parameters for all its generic models.

http://www.wecc.org/Reliability/WECC%20Second%20Generation%20Wind%20Turbine%20Models%20012314.pdf (www.wecc.org/Reliability/WECC%20Secon...)

I hope that helps.

Jorge

Thank you! This solved a problem I had for the last couple of months. It is incredible how an expensive software has so many bugs and limitations.

I have found a possible solution, and I would like to share it with the community in case anyone might be interested.

In this case, one would use the model PLNTBU. This model is exactly the same as the well known REPCA; however, the advantage with PLNTBU is that one can attach this model to a different busbar the generator is connected, in my particular case I choose to do so at the POI above the main transformer. Moreover, because PLNTBU allow for additional reference signals (i.e. Vaux, Paux and Qaux) one can control two inverter models with one plant level controller by assigning the Vref (VAR L) to INV1 and Vaux (VAR L+10) to INV2 for example.

Finally, it is necessary to use the Renewable Energy Auxiliary Control Model (REAX4BU), as this component would be the interface for each of the electrical control (REECU) models which in turn send the control signals to the inverter model (REGCA).

Hi, thanks for your reply. Unfortunately there is no mention of REPCMU1 in the MODEL documentation for PSSE 34 and 33.

Hi, thanks for your reply. It doesn't seem that there is a REPCB model on PSSE 34 and 33. Could you please let me know which version are you referring to for this model?

By the way, if you are interested in a quick (and basic) tutorial you could have a look at the following pdf: https://www.engr.colostate.edu/ECE461/FA13/LAB4/LAB4.pdf Hope that helps!

Thanks for the update, I will try and keep you posted.

Hi everyone,

Does anybody know if it is possible to have a master-slave configuration for three Generic Renewable Plant Control Model (REPCA)? I have a case in which we have two inverters in parallel with a plant controller each, and I would like to have a third plant controller to send Q setpoints to the other two for voltage control at the point of interconnection.

I would appreciate your help.

Best regards,

Jorge

I agree with the previous comment, it is good practice to check the MODELS documentation to get accustomed to the PSSE models of interest. However, I believe the parameters you are looking for are Kp and Ki; the proportional and integral gains for the reactive power control PI control.

Hope that helps.

Hi, in this case you would have to place a line between the infinite busbar and the following bus. With this in mind, then you would have to calculate the grid impedance by using the short circuit power and the X/R ratio at the connection point. Finally, you would have to set the calculated R and X values (in p.u.) onto the line impedance data.

Hope that helps.

Hi, with limited amount of information I would say have a look at the K factor of the inverter's electrical control (i.e. Kqv). You have to be careful though because normally this value is set to 2, if a grid is not strong enough (lack of reactive power capabilty) then a higher value might result in system instabilities.

You would also have to check the trigger voltages, namely Vdip and Vup; as well as the deadband for voltage control db1 and db2. Normally there parameters are set to match, for example if you want the inverter to enter fault ride through mode at a +-10% deviation, then you will set Vdip and Vup to 0.9 and 1.1 respectively, and db1 and db2 to -0.1 and 0.1.

If you are still not getting the desired results, I would say check the reactive and active current signals, check that the remaining control portion of both the electrical control (REECA) and the plant controller (REPCA) are inactive or frozen (for that you also would have to check Vfrz in the REPCA), and finally check the states and calculate what is going on at the FRT portion of the electrical control.

I hope that helps!

Hello everyone,

PSSE 3.4.4 Python 2.7.13

I am trying to plot multiple *.out files from a folder but everytime I execute the script I get a warning message that says:

  Warning during libifport.dll initialization
      Non-compatible version of Fortran libifcore DLL was loaded to process address space

Does someone know what might be the problem here? If I click OK on the pop-up message the script is able to plot the files. However, I need to plot several cases automatically so I might not be present at all times.

Best regards,

Jorge

Hi everyone,

PSSE v3.4.4 Python 2.7.13

I am trying to execute a python script that is going through multiple tests one at a time and I noticed that fort.x files are created on the current directory. When I am running a long test the file starts at fort.195 and by the time it reaches fort.9 PSSE crashes giving me an error:

Termination message: program has STOPPED DYRE - 3 At time xx:xx

I am not sure how can I disable the creation of such files within PSSE or Fortran. Could you please help?

Best regards,

Jorge