Pid Self-Tuning Controllers Used in Different Structures of the Control Loops
Fecha
2008Autor
Dugan, Viorel
Dan, Adrian
Ionescu, Clara
Cotrumba, Mirela
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The paper investigates the behavior of digital PID self-tuning controllers
(STC) in different structures of the control loops used in adaptive systems. In the two
phases of this type of systems which use a STC-PID, the first phase, i.e. the task of
recursive identification of the plant model parameters, is used a regression (ARX)
model with the recursive least squares method. Because the quality of process model
depends on the order of the ARX model and of the sample period (Ts), the digital PID
parameters are functions of these variables and, supplementary, of continuous-time PID
parameters and of the control loop structures used in the adaptive system (although, not
so largely as the firstly three variables).