Derivative backoff: The other saturation problem for PID controllers

doi:10.1016/j.jprocont.2015.06.008

Derivative backoff: The other saturation problem for PID controllers

2015-09-01

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DOI：10.1016/j.jprocont.2015.06.008

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The PID controller is by far the most common controller, and to ensure good behavior under all circumstances, a PID implementation must consider many practical aspects such as integrator windup, derivative kick, and bumpless parameter and mode changes. In this paper, an entirely new issue for the derivative part is introduced and has been named derivative backoff. It occurs when the process value measurement saturates and is a general issue that affects all PID implementations. Derivative backoff is described in detail and it is shown that it can cause considerable, undesired, effects on industrially relevant processes even when they are controlled by well-tuned PID controllers. An antibackoff strategy for PID controllers with integral action is proposed and evaluated, and a simple patch for existing PID implementations is presented. Possible strategies for PID controllers without integral action are also discussed. (C) 2015 Elsevier Ltd. All rights reserved.

Keyword:

Derivative backoff

PID control

PID controllers

Derivative action

Control algorithms

Derivative backoff: The other saturation problem for PID controllers

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