Monitor and Optimize PID Loop Performance With Aspen PID Watch

2014 Aspen Technology, Inc. All rights reserved |

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Our Speaker: Rachel Lowell

Rachel Lowell APC Product Marketing Aspen Technology Inc.

Rachel Lowell is a member of the product marketing organization at AspenTech, specializing in advanced process control products. She holds a Bachelor of Science Degree in Chemical Engineering from The Florida State University.

2014 Aspen Technology, Inc. All rights reserved

Rachel Lowell

APC Product Marketing, Aspen Technology Inc.

June 18, 2014

Monitor and Optimize PID Loop Performance with Aspen PID Watch


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Agenda

Why regulatory control is important to APC

Monitoring PID Loops

Online

Offline

PID Loop performance reports and analysis

Tuning PID Loops

Use the tuning toolkit to improve problematic PID Loops and optimize performance

Demonstration & discussion with Lucas Reis

Q&A with Randy Burch


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PID Control

ProportionalIntegralDerivative (PID) Generic control loop feedback mechanism (or controller) widely

used in industrial control systems

PID controller calculates an "error" value as the difference between a measured process variable and a desired set point. The controller attempts to minimize the error by adjusting the process control inputs.

PV response to varying proportional term (with constant integral and

derivative)

PV response to varying integral term (with

constant proportional and derivative)

PV response to varying derivative term (with constant proportional

and integral)


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Control Loop Tuning

Tuning a control loop is the adjustment of its control parameters (proportional band/gain, integral gain/reset, derivative gain/rate) to the optimum values for the desired control response.

Stability (bounded oscillation) is a basic requirement, but beyond that, different systems have different behavior, different applications have different requirements, and requirements may conflict with one another.

settling time

rise time


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Causes of Poor PID Performance

Tuned for stability rather

than performance

20%

Actuator deteriorated

15%

Interaction with other loops

20%

Process/Feed change

15%

Measurement and

Instrumentation Issues

5%

New process operating point

15%

Operator/Training

10%


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Aspen PID Watch Functions

Although there is overlap of work-flow processes, the control loop monitoring tasks can typically be

classified into online and offline functions

Report: Identify deficient PID loop control

Monitor: Validate control

performance

Retune: Resolve

control or mechanical

issues

Assess: Analyze control loop issues

Online

Offline

Control Loop Monitoring


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PID Loops Tuning

display includes:

Tag Name and Description

DCS Type

PID Form and Equation

PV High/Low Limits

PID Tuning coefficients

Control action

PID Loops Tuning


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PID Loop Analysis


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Raw Data Plot

Provides historical trend values for process measurement, setpoint and control valve output

Includes indication for manual control mode and bad process measurements

PID Watch Analysis


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Impulse Response Plot

Represents the closed-loop impulse between the ideal disturbance sequence and process input

Provides a direct measure of how the PID controller is performing in rejecting disturbances or in tracking of setpoint changes

PID Watch Analysis


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Performance Index Plot

Control loop performance in response to random disturbances or ability to achieve setpoint changes

Index ratio of actual performance over minimum variance control

PID Watch Analysis


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Valve Analysis Plot

Includes statistical-based and pattern recognition techniques for estimating control valve oscillation and valve stiction size

PID Watch Analysis


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Analysis Summary

Provides an overview of all PID loop analysis results and performance metrics

PID Watch Analysis


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PID Watch Analysis Process Model Identification


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PID Watch Analysis PID Tuning Simulation Plot


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Lucas Reis Sr. Product Designer, Product Management Aspen Technology Inc.

Lucas Reis is the APC Sr. Product Designer. He earned a B.S. and M.S in Chemical Engineering from the University of Uberlandia, Brazil. He worked in APC Services and product management during his career at AspenTech.


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Want to see similar results?

http://training.aspentech.com

Consider a training class from AspenTech


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Advanced Process Control Performance Monitoring

Advance Process Control

Performance Monitoring (APC2600)

July 2, 2014 Reading, UK

July 28, 2014 Houston, TX

August 27, 2014 Reading, UK

http://support.aspentech.com/supportpublictrain/CourseInfo.asp?course=APC2600

Learn how to use Aspen Watch KPI to analyze and troubleshoot controller performance, and how to detect and repair model

mismatch in Aspen DMCplus controllers.

Learn to sustain the benefits achieved by your control applications.

Learn how Aspen Adaptive Control can help improve performance of the controller through generating and deploying updated models.


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Register for AspenTechs Online Customer Community

To register, please visit

www.aspentech.com/community

Questions? Email [email protected]


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Get Started Now!

Join the PID Watch discussion, live now!

https://www.aspentech.com/community

Discussions

DMCplus & APC products

Product Discussions

Thread: Aspen PID Watch

Full URL: http://www.aspentech.com/Community/Discussion/?g=posts&t=27917287577


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Q&A

Randy Burch Advisor, Advanced Control Technology Products Aspen Technology Inc.

Randy Burch is an Advisor in the Advanced Process Control R&D group at Aspen Technology. In over 20 years with Aspen, he worked for 10 years as an APC Services engineer responsible for design, implementation, and commissioning of advanced process control and optimization projects, prior to joining the APC software development team.

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Monitor and Optimize PID Loop Performance With Aspen PID Watch

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