Nature Based Control
Structures
Luís Gustavo Soares Longhi
PETROBRAS
PSE-BR 2019 – Process Systems Engineering
QUESTIONS
Questions?
What is the main function of control/feedback?
What is the more important information would you
save from a process control project?
What is an optimum (great) control project?
How does nature "solve" this problem?
Why do industry control projects sometimes not work?
The most valuable information
What is an optimum (great) control project?
What is an optimum (great) control project?
How does nature "solve" this problem?
• Multivariable systems Multivariable Control (always
operating, but alternating dominant effects)
• Multivariable Control ≠ Dense matrix control (APC old
days)
The number of controllers required for a MISO or SIMO system to operate
properly in closed loop must be at least equal to the highest number of MVs or
CVs in this system. If we restrict to the minimum, this condition is sufficient,
since all relations between CVs and MVs can still be taken into account. The
required condition of this heuristic is also true for MIMO systems. However, in
this case, the sufficiency condition does not apply because the minimum
number of controllers may be insufficient to ensure a good performance due to
the neglected relationships between CVs and VMs.
Examples
Examples
Examples
Examples
Examples
Examples
