June 2005

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HP Control: Part 2 – What is advanced process control?

Part 1 discussed what APC attempts to do and how it makes money. This part discusses modern APC. Structure of a modern APC application. We now leave the philosophical concepts and go into the struct..

Friedman, Y. Z., Petrocontrol

Part 1 discussed what APC attempts to do and how it makes money. This part discusses modern APC. Structure of a modern APC application. We now leave the philosophical concepts and go into the structure of a modern APC application (Fig. 1). At the heart of this application is a multi-variable predictive controller (MVPC), which reads all unit constraints and sets the manipulated variables. Two and three decades ago, we used to make a distinction between constraints and operating targets. Operating targets were typically product qualities, measured by analyzers, and those were to be kept ideally on targets. Constraints, on the other hand, were to be kept always below (or always above) ta

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