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Case convergence problem

asked 2021-02-21 22:00:22 -0500

OK gravatar image

Hello, I have problem with my case, where it is not really converging at all. could you please help me by listing the possible causes which lead to non-convergence of a case, e.g. I heard that reaching reactive generation limit is one of the reasons for non-convergence of the case.

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answered 2021-02-26 04:04:34 -0500

Cao Huy gravatar image

Here are some reasons:

  1. Supply-demand unbalance
  2. Too much power transfer through an interface
  3. Voltage control problems

I suggest:

  1. balance load and generators manually, for each area.
  2. run loadflow with flatstart, ignore reactive power limits.

In case there is not sensitive information in your file, I could lend you a hand.

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answered 2021-02-22 09:45:10 -0500

jconto gravatar image

Numerically non-convergence conditions due to switching back & forth of capacitors or adjusting transformer taps or conflicting voltage control objective of generators need to be cleared first. Next, check that total generation and load, in P and Q, are close enough so the swing unit could resolve the unbalance.

Find a previous case that converged, compare them to find the significant differences and adjust accordingly. For example, if there is too much load in the non-converging case, consider reducing it to a level that you can converge again and then perform a PV study to find the maximum load to increase before reaching non-convergence.

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answered 2021-02-22 01:38:42 -0500

perolofl gravatar image

Try to solve with ignore reactive power limits.

Then check the generators with reactive power overload.

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I tried, still same problem

OK gravatar imageOK ( 2021-02-22 05:55:12 -0500 )edit

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Asked: 2021-02-21 22:00:22 -0500

Seen: 177 times

Last updated: Feb 26