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The generalized forced oscillation method for tuning PID controllers
Charles Lorenzini1, Alexandre Sanfelice Bazanella1, Luís Fernando Alves Pereira1
1Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 90035-190, Brazil.
Abstract:
In this paper a generalized tuning methodology for proportional-integral-derivative (PID) controllers is proposed. The methodology is akin to the Ziegler-Nichols forced oscillation method, inheriting fully its practical appeal, but can be applied to much more general classes of plants. This generalization is achieved by employing a relay with adjustable phase (RAP) in a relay feedback experiment, and the tuning consists of formulas based on measurements obtained from this experiment. Experimental results in a liquid processing plant with of-the-shelf industrial equipments illustrate the performance of the methodology and the practical procedures involved in its application, which can be fully automated.
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