JS14's profile - activity

Is there a Booster transformer (icon) in PSSE? I want to simulate a Booster transformer in PSSE.

What is the best way to tune parameters such as the gain (K), time constants (T1 to T4) and the capacitor\reactor size for the SVC models CSVGN1 (generator model) and CSSCST (switched shunt model) in PSS/E? I am getting an error of initial conditions suspect for the first regulator (state K) for the models. When I increase the time constant T3 to 10 the DSTATE error reduces to about 0.004 but there is an overshoot in the voltage and the initial conditions suspect error is still there. Can you give me typical parameters that I can use on a small SVC (rating of about -0.3/0.3, -0.1/0.1 or -1/1)?

Thank you. I have changed the bus code using the bus_data_3 API before closing the branch as you suggested and it has worked.

Thank you for your response. I have tried to run the dynamic simulation with the distbranchtrip and distbranchclose APIs. The zero impedance line trips when I use distbranchtrip API. However, after the circuit is set to out of service the bus where the load was connected is automatically disconnected because it becomes islanded with no in-service machines connected to it. Thus, when I use the distbranchclose API an error message is displayed saying that the bus is out-of-service and has type code=4 so the branch is not put back in service. Is there a way around this?

I would like to know up to what value I can increase the tolerance in the dynamic solution parameters in PSS/E under network solution. I've realized that the voltage recovers to a higher value following a fault if I increase the tolerance. The solution also converges at some point after increasing the tolerance if it previously didn't. Is there a certain point (value) after which it is not advisable to increase the tolerance. The default value is 0.0001. I had to increase it to 8 or thereabout sometimes for it to converge. Does this affect the accuracy of the simulation?

Which API can I use to trip loads at a bus bar using python and to reconnect it back during dynamic simulations? I tried to use the ldmod_status2 API but it doesn't trip the load. It just changes the status of the dynamic model attached to a load from on to off or vise versa.

How can I interrupt loads at a bus when the voltage is below a given threshold in PSS\E using python during dynamic simulations? The load is then reconnected back after a certain period of time. Below is a sample of the code that I am trying to develop. Let me know if there’s a better way to do it or how I can make this code to work.

#Check the bus voltages that are higher than 1.1 p.u and lower than 0.9 p.u
psspy.set_vltscn(1,1.1,0.9)

#Run a command which interrupts loads if the voltage is below 0.9 p.u by changing the status of the load model from in service to out of service
for n in range(1,20):  # list of bus numbers
if psspy.set_vltscn(1,1.1,0.9) < 0.9: # if voltage is below 0.9
   psspy.ldmod_status2(i,'id',1,0)   # interrupt load at that bus. Where i is bus number, 'id' is the load identifier, 1 is the load model type and 0 is the new model status indicating out of service

#Run to 1 second
psspy.run(0,1,1000,1,0)

#Reconnect the load after a certain period of time (1 sec in this case)
psspy.ldmod_status2(i,'id',1,1)

 #Run to 10 seconds
psspy.run(0,10,1000,1,0)

 # Halt pss\e
  psspy.pssehalt_2()