Network does not converge due to large amount of CLMDBLU2 in system

asked 2017-11-21 18:41:08 -0600

Phyl
5 ●4 ●5 ●7

Hi All,

I am using version PSS/E 34.2 to do dynamic simulations. I am including a high amount of CLMDBLU2 load models, and when the percentage of loads with load models that I include in the dynamic file increases above 25% I receive the error that the network does not converge. All my dynamic models have been checked with DOCU, and there aren't any problems. I am unsure of why I am getting the error. Any suggestions appreciated.

Thanks!

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answered 2017-11-28 03:16:54 -0600

perolofl

3322 ●1 ●8 ●18

I assume you are simulating a disturbance when you get network does not converge. If so, there might be a voltage stability problem when using a high amount of dynamic load models.

Please elaborate more on when the problem occurs in the simulation. Is it after fault insertion?

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The network does not converge after initialization once the simulation is running during the first time step. This is prior to any fault insertion.

Phyl ( 2017-11-30 11:59:17 -0600 )edit

This error also occurs with any test system that I use regardless of the size of the system, the error happens when between 25% and 50% of the loads are CLMDBLU2. This does not occur when I use other models such as CLODBL.

Phyl ( 2017-11-30 13:46:08 -0600 )edit

Run just 1 time step and check the voltages. Use activity DIFF (File - Compare - Powerflow Cases) to compare the actual bus voltages with the original voltages in the saved case. I guess you have problem at some load buses.

perolofl ( 2017-12-01 06:30:27 -0600 )edit

I've used DIFF and there are several buses where there are difference between the actual and original bus voltages. Do you have a suggestion for what to change in model to remedy this?

Phyl ( 2017-12-04 19:46:01 -0600 )edit

You are using a very complicated load model at many load buses. How did you get all the parameters? DOCU,CHECK is not a gaurantee of correct or decent parameters. It seems to be a nightmare to use that model. I recommend to switch to another model.

perolofl ( 2017-12-05 01:35:54 -0600 )edit

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answered 2017-11-22 06:16:54 -0600

jconto
2701 ●10 ●30 ●41

Check the Program Operation Manual, Chp. 3, Table 3-1. Standard Maximum PSS®E Program Capacities Your set up might be exceeding PSSe vars dimensions.

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If so it would have been alarmed at DYRE and the exceeding models would be ignored. It can hardly be the reason for network not converging.

perolofl ( 2017-11-28 03:19:24 -0600 )edit

I have checked with the POM and I am not exceeding any limits as I am using the 200,000 bus size level.

Phyl ( 2017-11-30 12:12:53 -0600 )edit

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Network does not converge due to large amount of CLMDBLU2 in system

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