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rayen_6827
Member junior
Joined: 21 Jun 2013
Posts: 67
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 Posted: 29/12/2017 11:48 Post subject: control the temperature of a process |
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hello my friend
Is this the correct cascade algorithm for To control the temperature of a GAS process(TT02)?
The control speed is low and it lags in a steady state or sometimes fluctuates(TT02)
What is your offer way for control temperature and help?
I want optimize the PID FOR To make swings not
I think by changing the coefficients pid better is
THANKS.
WINCC SCREEN:
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commit
Junior
Joined: 28 Dec 2017
Posts: 3
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| Posted: 29/12/2017 18:51 Post subject: |
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Read about on
http://plc.myforum.ro/viewtopic.php?p=31172#31172 |
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sotter
Junior
Joined: 02 Dec 2017
Posts: 4
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| Posted: 29/12/2017 22:34 Post subject: |
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You have to use cascade control
This is the general schematic
The advantage of cascade control is that disturbances affecting the inner loop can
be compensated much more quickly in the slave loop than in the slower master
loop.
In some situations, non-linear effects of the actuator (e.g. valve) can be
compensated in the slave loop so that a linear process response can be achieved
for the main control loop.
Cascade control is only feasible when there are further measurable variables in the
process in addition to the main control variable and when the inner control loop is
significantly faster than the outer loop.
The inner controller will be chosen such that the dynamics of the inner control loop
is beneficial, e.g. time constants of the inner loop are compensated. If there is a
disturbance affecting the inner loop of the system, this can be controlled better
than with single-loop control, where disturbances possibly have to pass through the
slow time constants of the outer loop.
I saw gert put some useful information regarding.. |
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bestell
Junior
Joined: 10 Jan 2018
Posts: 7
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| Posted: 14/01/2018 20:24 Post subject: |
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Here is a project with same configuration you need
http://plc.myforum.ro/viewtopic.php?p=31584#31584 |
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bestell
Junior
Joined: 10 Jan 2018
Posts: 7
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| Posted: 03/02/2018 11:59 Post subject: Cascade PID Control in PCS7 V9.0 |
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Cascade PID Control in PCS7 V9.0
[URL=https://userscloud.com/spvjms2tys27]Apl_exam.zip - 308.0 MB[/URL]
Open with File-> Retrieve |
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