Online control calculation for models containing near colinearity and uncertainty
US9715221B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2014 |
| Grant date | Jul 25, 2017 |
| Priority date | — |
| Expiry date | Jan 8, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B17/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method, apparatus, and computer program product for increasing closed-loop stability in a MPC controller controlling a process where there are significant uncertainties in the model used by the controller. This invention focuses on the improvement of the robustness of the steady-state target calculation. This is achieved through the use of a user defined robustness factor, which is then used to calculate an economic objective function giveaway tolerance and controlled variable constraint violation tolerance. The calculation engine uses these tolerances to find a solution that minimize the target changes between control cycles and prevent weak direction moves caused by near collinearity in the model. If the controller continues to exhibit large variations in the process, it can slow down the manipulated variable movement to stabilize the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.