Tuning integrating CVs in DMC+

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Posted by Keith Landells on May 01, 2001 at 07:35:41:

Has anyone developed any ways to tune integrators with large capacity in DMC so that the buffer volume is fully utilised ? We have plants where MVs/CVs span across buffer tanks that hold many hours of production. We want to be able to fully use the tanks so that we can tolerate rises in level over 8hrs, say, in order to deal with downstream CV disturbances without significantly changing the upstream MVs (reactors). The only way we can approach the response we want using Simulate is to use the programmed imbalance facility - but this has no way to drive the level back to our ideal comfort value and just ramps to max or min.

DMC+ just loves to balance ramps quickly, but we have a Tss of 180mins and a tank that can run imbalanced for many shifts without causing operational problems.

Should we place so much emphasis on Simulate results or should we put the controller on the plant and see what happens ?!

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Re: Tuning integrating CVs in DMC+ Mike McCarty 18:56:12 5/08/01 (0)
Re: Tuning integrating CVs in DMC+ Dan O'Connor 12:01:21 5/01/01 (0)

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: Has anyone developed any ways to tune integrators with large capacity in DMC so that the buffer volume is fully utilised ? We have plants where MVs/CVs span across buffer tanks that hold many hours of production. We want to be able to fully use the tanks so that we can tolerate rises in level over 8hrs, say, in order to deal with downstream CV disturbances without significantly changing the upstream MVs (reactors). The only way we can approach the response we want using Simulate is to use the programmed imbalance facility - but this has no way to drive the level back to our ideal comfort value and just ramps to max or min.

: DMC+ just loves to balance ramps quickly, but we have a Tss of 180mins and a tank that can run imbalanced for many shifts without causing operational problems.

: Should we place so much emphasis on Simulate results or should we put the controller on the plant and see what happens ?!

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