Dyn-005H Controller Tuning
of 7
Transcript of Dyn-005H Controller Tuning
-
7/29/2019 Dyn-005H Controller Tuning
1/7
2012 Aspen Technology, Inc. All rights reserved
Revised: Nov 27, 2012
Controller Parameter Tuningwith Aspen HYSYS V8.0
-
7/29/2019 Dyn-005H Controller Tuning
2/7
2012 Aspen Technology, Inc. All rights reserved | 2
Objectives
Use Ziegler-Nichols, Cohen-Coon, and time integraltuning methods to determine controller parameters
-
7/29/2019 Dyn-005H Controller Tuning
3/7
2012 Aspen Technology, Inc. All rights reserved | 3
Background
A strong controller is one that can respond quickly to adisturbance while limiting the oscillation and overshoot. Onesuch controller is the PID controller, which takes intoaccount current error (P), past error (I), and predicted error(D).
Optimal tuning parameters can be determined throughmethods such as Ziegler-Nichols, Cohen-Coon, and ITAE.
A reaction curve can be used to find the gain (K), time delay(), and time constant ()
-
7/29/2019 Dyn-005H Controller Tuning
4/7
2012 Aspen Technology, Inc. All rights reserved | 4
Background
K, , and are then used to determine tuning parameters
Tuning Method Ziegler-Nichols 1.2
2.0 0.5
Cohen-Coon 1
4
3+
1
4
3 2 + 6
1 3 + 8
4
1 1 + 2
ITAE 0.965
.
0.796 0.147
0.308
.
-
7/29/2019 Dyn-005H Controller Tuning
5/7
2012 Aspen Technology, Inc. All rights reserved | 5
Key Teaching Points
A properly tuned PID controller can eliminate offset andminimize oscillation.
Different tuning methods yield different parameters. The
optimal solution can be inferred by running the dynamicsimulation and observing how the process behaves.
-
7/29/2019 Dyn-005H Controller Tuning
6/7
2012 Aspen Technology, Inc. All rights reserved | 6
Problem Statement
The system consists of two tanks, with the liquid outlet fromthe first flowing into the second. The first tank has hot andcold water streams flowing in
Inspection of a reaction curve yields the following parameters =
=
%
%= 0.9333
=20 seconds = 0.33 minutes
= 200 seconds = 3.33 minutes
-
7/29/2019 Dyn-005H Controller Tuning
7/7 2012 Aspen Technology, Inc. All rights reserved | 7
Copyright
Copyright 2012 by Aspen Technology, Inc. (AspenTech). Allrights reserved. This work may not be reproduced or distributedin any form or by any means without the prior written consent ofAspenTech. ASPENTECH MAKES NO WARRANTY ORREPRESENTATION, EITHER EXPRESSED OR IMPLIED, WITHRESPECT TO THIS WORK and assumes no liability for any errors or
omissions. In no event will AspenTech be liable to you fordamages, including any loss of profits, lost savings, or otherincidental or consequential damages arising out of the use of theinformation contained in, or the digital files supplied with or foruse with, this work. This work and its contents are provided foreducational purposes only.
AspenTech, aspenONE, and the Aspen leaf logo, aretrademarks of Aspen Technology, Inc.. Brands and product namesmentioned in this documentation are trademarks or service marksof their respective companies.
