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reattempt solve if iteration limit is reached

asked Jan 5 '12

JervisW gravatar image

updated Jan 5 '12

How can I reattempt to solve using the full newton raphson method when the 20 iteration limit is reached?

2 answers

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2

answered Jan 15 '12

jtrain gravatar image

To do this programmatically, I use the solved function. It looks at the last solution and returns an error code > 0 if there was a problem and returns 0 for no problem.

Assuming you have psspy.throwPsseExceptions = True near the start of your file:

import psspy
psspy.throwPsseExceptions = True
ITERATION_LIMIT = 1

def solve_and_reattempt(attempts=3):
    for attempt in range(attempts):

        try:
            return psspy.fnsl()

        except psspy.FnslError:

            # an error solving, if iteration limit reached resolve
            if psspy.solved() == ITERATION_LIMIT:
                continue
            #  else re-raise Error
            else:
                raise

and you would use the solve_and_reattempt function like this:

solve_and_reattempt(attempts=2)
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4

answered Jan 11 '12

chiangm gravatar image

Hi JervisW,

You may increase the maximum number of iterations to something like 100 or more: Power Flow > Solution > Parameters > ITMXN

regards, chiangm

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Comments

Nice, I didn't know about increasing the solution parameters. What if I wanted to check if the iteration limit is reached in my script?

jtrain gravatar imagejtrain (Jan 11 '12)

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Asked: Jan 5 '12

Seen: 1,810 times

Last updated: Jan 15 '12