Moji's profile - activity

Thanks. Yes I want to read line flow at each time step and compare with rated value to find the overflow line to trip them. I made a loop for psspy.run stopping at each step, now how I can get the line flow at each step? Does ‘brnmsc’ give the value?

Hi all,

I wonder if we can read value of variables during dynamic simulation? For example, checking line flow during dynamic simulation, and add some conditions based on that. Since we run simulation (psspy.run) up to a stop time, does psse provide this facility to have the variables values as real time output existed during simulation? ( to be clear, I am not talking about output retrieval from channel setup).

Thanks for thr feedback. In that case, where can I find the status of components to store them? For that specific relay, I couldn’t see any output variables to store. Do you mean ierr variable?if so, ierr only shows the APIs status not component working status

Thanks for your response. My problem is that I don’t know where the status of components are, e.g. in DISTR1 couldn’t find the output representing the status(added in .dyr) I noticed some APIs for relay adding, but no idea for the status in ierr. I appreciate if you have any idea in this cass

Hi all,

I wonder that how we can see the status of componenet in dynamic simulation via python? For instance, we add a relay into system, then where can we find if it is activate or not? Although we can check its function based on the result, monitoring its status is my concern.

Here is the part of python for excel output:

pvfile = r"resultdouble.pv" string = ['s','v','m','g','l','b','i'] xlsfile = 'result.xls' sheet = '' overwritesheet = True pssexcel.pv(pvfile,string,colabel=colabelnew,xlsfile=xlsfile,sheet=sheet,overwritesheet=overwritesheet)

I guess that it is because of the limitation of writing data into Excel which maybe support writing data up to a specific number of rows/cells. Do you all agree with that?

I have the result for a PV analysis that contains about 14000 contingency cases. When I want to export the result in an excel file using either in Export data tool in PSSe or Python automated, I only get the result for up to 360 contingencies analysis. Is there any limitation to exporting the data? Does anybody know how I can export the whole result for all contingencies?

Thank you so much for your very comprehensive explanation. Regarding the voltage angle output, it can be extracted, if AC power flow applies in the inner loop. Is that correct? Also, could you introduce me any similar code or snippet that might help me to write this routine? Appreciate your time.

Thank you for the reply. Following your point, could you please help me to know that how it can be done using python? Any advice or hints would be highly appreciated.

Hi all,

My simulation in PSSE v34 contains the PV analysis for defined contingency scenarios. The PV analysis output file gives me bus voltage, branch flow, and other standard information.

I wondered how I can see the voltage angle of buses for each case.

Thank you for helping me in this case.

Regarding PV analysis in PSSe, what is the termination criteria if we uncheck the voltage limit?

I run a PV analysis without voltage limit and chose 0.5 MW as mismatch tolerance. Is the mismatch tolerance considered as termination for increasing the power transfer to the next step?

if so, It doesn't indicate the divergence in power flow computation and only considers the mismatch for the next level. Am I right?

For example, what would be the termination condition here ( there is no low voltage limit check, and mismatch tol. is 0.5 MW)?

MW TRANSFER-> 0.000 100.000 200.000 300.000 400.000

LARGEST MVA MISMATCH 0.01791 0.06002 0.06557 0.16307 0.45200

TOTAL MVA MISMATCH 0.02811 0.12424 0.13641 0.35181 1.12765

CONVERGED YES YES YES YES YES

CONVERGE CONDITION

Also, what is the meaning of 'CONVERGE CONDITION' here which they all are empty here?!

Thanks a lot for supporting me here!

Moji

I have a very dense case in the PV analysis and I want to have bus voltage data per each continency scenario and per power transfer, as it is easy for analysis. However, the default report shows the results per continency analysis for all incremental power transfers in the row. Is there any way to have it as mentioned above? it would be something like below: Case X1 for MV transfer level: L1 v1 v2 . .

Case X1 for MV transfer level: L2 v1 v2 . . Case X2 for MV transfer level: L1 v1 v2 . . and so on and so forth. Thanks, Moji

Thank you. I understand. Could you please let me know where I can find a good source/manual/tutorial for learning Python in PSSe? I need to get familiar with psspy functions and commands. I appreciate the time and help.

I appreciate sharing that. One more question, is it possible to run such routine considering different generation patterns either using PSSe tools or the python approach? Thank you.

Thanks for the answer. Regarding creating files for PV analysis, could you give me the hints to know how they will be if the scenario is: - SOURCE: change the load of some buses - SINK: Whole of the system I am working on 118-bus where it has only 1 area based on the RAW file. Thank you Moji

Hi all,

I want to do a contingency analysis such that for each scenario, there are some changes in load or line flow. ( i.e., each contingency scenario should iterate over a parameter range like the power flow of a line denoting a range of load transferring between two areas). Is there any way to carry out that procedure in PSSE? Like using python. I know using ACCC helps us make the scenarios; however, I guess this is a static action as there is no option for changing some load/line flow for each scenario.

I would appreciate your support and help.

Best, Moji