| Summary: | 碩士 === 國立成功大學 === 化學工程研究所 === 83 === An autotuning method is developed to provide plant operators
with an easy-to-understand tool to design multiloop
decentraliz- ed PI controllers in a sequential way. Underlying
algorithms for sequential design are discussed. According to
the algorithms, the multivariable design problem consisting of
N interacting control loops can be treated as a sequence of N
single-loop SISO problems. An identification procedure based on
a step transient response test or a closed-loop relay test is
then applied to each loop in a predetermined sequence.
Multiloop controllers settings are obtained via the resultant
models and the proposed tuning rules. The proposed autotuning
method leads to satisfactory mul-tiloop design in the terms of
performance, robust stability, and integrity with minimal
engineering effort. Despite its simplicity, the method is often
far superior to that resulting from the empirical method based
on time-consuming trial-and- error procedures as demonstrated
on numerous 2x2, 3x3, and 4x4 actual distillation systems from
the literature.
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