1. Part 3--What is advanced process control?
- Author
-
Friedman, Y. Zak
- Subjects
- *
PROCESS control systems , *AUTOMATIC control systems , *CONTROL theory (Engineering) , *LINEAR programming , *QUADRATIC programming , *NONLINEAR programming - Abstract
This article discusses the structure of advanced process control (APC). SALP attempts the APC level three constraint balancing: alleviate active constraints based on some rudimentary economic rules, making room for more feed, though that function is more problematic. Well-designed modern APC applications employ inferential models even where reliable analyzers exist. Inferential indications typically lead analyzer readings by one hour, and that is a significant dynamic control advantage. If MVPCs could take a cascade structure, it would have been ideal to set the analyzer as a primary controller and the inference as a secondary slave controller.
- Published
- 2005