perolofl's profile - activity

I don't think you can change it in dynamic model. The intent is to control the actual power through the transformer during the simulation. Simulate a disturbance so the actual flow goes outside the dead band defined in load flow data of the transformer.

An alternative is to change the dead band data during the simulation, i.e. shift the dead band with x MW in the load flow data of the transformer.

It works for me!

In a diagram:

Select Diagram - Properties and Amps in Load Flow Annotation.

EDIT:

Here is a node-breaker diagram for bus 153 in savnw:

AMPS/PU Current is shown here.

See post Infinite Generator.

There is no message from model PVEU1 before the machine list?

Dynamic Simulation Options - Generic Scan - Scan generators exceeding angle threshold.

Select a proper angle for trip and "Monitor and trip".

You need to use a plant controller model.

Use psspy.change_wnmod_var(ibus, id, name, j, rdata) to change the VAR.

Try PFQTYP2U with a very small value of Ki in order to disable the integration. It should then just be a proportional control.

It is possible to write a Mvar-model with Q/U droop. PFQTYP2 has integration, hence the steady state droop is zero.

That’s normal voltage control, using an exciter model.

I don't understand, do you want voltage control only, or transient voltage control with a supervisory control slowly restoring the Mvar output?

Are you adding the relay inside PSSE and writing a new version of the .dyr file? Please explain exactly what you are doing.

Are you running a script?

Scroll to the last column in the Dynamics data tab.

Model PFQTYP2U can be used in rev 35 to model P.F. or Mvar control.

EDIT:

Block diagram is missing in rev 35 manual, here it is:

No, there is no reverse activity to Tap Line.

Using equivalance activity EQRD to remove the bus and connect the two line sections to a direct line will not give the exactly same result.

Copy the line data from an old saved case with the line untapped.

Before simulation: Create dict1 with key (ibus,id) och value Pgen for all in-service generators in the system using APIs psspy.amachint, amachchar and amachreal.

After simulation: Create dict2 for all in-service generators after the simulation.

Tripped generators are: tripped_gens = {key: dict1[key] for key in dict1 if key not in dict2}

Dict tripped_gens shows the tripped generators and their original Pgen.

Would you like to print a report of tripped generators after the simulation?

Do you really want to print the time in progress window at every time step? What is the purpose?

It is not a library model in rev 35.

The solution method is returned by psspy.prmint('PFCODE').

The solution parameters are returned by psspy.prmdat(string). For example psspy.prmdat('ACCN') returns Newton-Raphson acceleration factor.

There is no parameter for tap position in PSSE. The tap is defined by the ratio. The ratio is calculated from RMAX, RMIN and number of tap positions. Use psspy.xfrdat and psspy.xfrint to get the parameters.

Who has written the model?

1: Script

• Record a python script while defining bus 10 as your subsystem.

• Assign the script to a Custom toolbar button (hammer 1-30).

It is now easy to define the subsystem after starting PSSE and loading the first case.

2: Preferences

In menu Edit - Preferences - General:

• Disable "Initialize subsystems when opening a case"

The selected subsystem definition will now be kept after opening a new saved case.

A dynamic model is not defined in a raw file…

It seems to be a governor model but the DYRE record is for a generator model (IC=1)????

Do you want to create a subsystem with bus 10?

Use GENDAT and BUSDT2 to obtain the total PGEN and PLOAD at the bus.

EDIT:

I didn't find any API returning bus subsystem totals. However, it is possible to use API scal for this. Example: A bus subsystem defined with sid=0.

ierr, totals, moto = psspy.scal_4(0,0,0,[],[])

The totals for the selected subsystem are returned in a tuple. Here, totals[1] contains the total MW load and totals[2] the total MW generation. See PAG manual for the rest of the content in totals.

CIM5BL: Switch in the load with the inital load torque in CON(J+18). Thereafter, pause the simulation at proper times and increase the load torque manually.

Use tool in menu: Power Flow - Convert Loads and Genertors...

To write the relay slot value (1 or 2) in DOCU and DYDA.

How do you simulate without seeing the progress output? You can always run the script inside PSSE.

@Engineer Power System: Which version of PSSE are you using?

It is better to write in English in this forum!

For in-line fault in a dynamic simulation, see post how can i set the fualt location in PSS/E.

The record "260 'USRMDL' 1 'PLBVFU1' 1 1 3 4 3 6 1 1 'BA1_Play_RT' 1.0 1.0 0.01 0.01 /" is ok for me.

Something is wrong with the simulations if the two results are not identical up to 3.5 seconds. Check the output in progress properly!

What is the name of plb-file? Show your dyre-record.

Yes, as shown above!

Skip the python script and run everything in the GUI. Check the progress window and dynamics spreadsheet.