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Mar
01

IFAC Conference on Advances in PID Control

The IFAC Conference on Advances in PID Control, PID’12, will be held in Brescia, Italy on March 28-30, 2012. As noted on the conference web site, the aim of this conference is to gather academic and industrial experts in the field in order to present the recent research developments in the design of PID controllers. In addition, the meeting aims at providing a perspective of the future requirements for PID controllers in industry. Emerson is one of the industrial sponsors of this conference.

Some of the top leaders in the process control industry will attend and speak at this conference. For example, Karl Johan Astrom, Senior Professor, Lund University, Sweden, will lead a panel on Future Perspectives of PID Controllers. Thus, many of the papers and panel discussions will be of interest to anyone actively involved in process control development and research.   At the PID’12 conference, Dr. Willy Wojsznis and I will give the following presentation on process control research and development by the DeltaV Future Architecture Team.

PID Advances in Industrial Control Terry Blevins (plenary presentation)

Abstract: Major advances that improve control in the process industry have been made over the last ten years in the basic PID technology of modern distributed control systems. This paper addresses the impact that international standards have on control implementation and the tools utilized in industry for monitoring and commissioning PID control. Examples are used to illustrate how new technologies, such as model switching for process identification, have allowed manufacturers to introduce a new level of ease-of-use in tools developed for on-demand and adaptive tuning. This paper discusses PID modifications that improve the speed of recovery from process saturation conditions that are common in industrial applications. Also, details are provided on PID modifications that enable effective control with non-periodic measurement updates by wireless transmitters. Finally, prospective future directions for industrial PID controllers are sketched.

Intelligent PID Product Design – Willy Wojsznis, Terry Blevins, John Caldwell, Peter Wojsznis, Mark Nixon

Abstract: This paper outlines intelligent PID design for DCS. The design includes a PID algorithm with diverse standard options and algorithm extensions for wireless/event-driven control and for surge control. The core of the PID intelligence is adaptive process modeling based on model switching and parameter interpolation. The developed process model is applied to loop tuning, adaptive control, loop performance evaluation and valve diagnostics. A user-friendly interface provides insight into a loop’s current state and history events. The interface also provides advice about how to improve loop performance.

Improving PID Recovery from Limit Conditions – Terry Blevins, Dan Coyne(BP), Willy Wojsznis, Mark Nixon

Abstract: This paper addresses the performance of the PID under startup or during normal operation when the PID output becomes limited. Common techniques that have been utilized to reduce the time required to get to setpoint during process startup are reviewed. The response of the PID to conditions that limit PID operation during normal operating conditions is discussed for different implementation approaches. In particular under limiting conditions, anti-reset windup is automatically activated when a positive feedback network is used to create the reset contribution. For such implementations, the recovery from a process saturation condition may be improved by modifying the PID operation. An application example is used to show the impact of this modification on response speed and overshoot.