Advanced process control (APC) is a broad term within the control theory. It is composed of different kinds of process control tools, for example statical process control (SPC), Run2Run (R2R), fault detection control (FDC), sensor control and feedback systems. APC are often used for solving multivariable control problems or discrete control problem.
Normally an APC system is connected to a distributed control system (DCS). The APC application will calculate moves that are send to regulatory controllers. Historically the interfaces between DCS and APC systems were dedicated software interfaces. Nowadays the communication protocol between these system is managed via the industry standard OLE for process control (OPC) protocol.
APC industries
- APC can be found in the (petro)chemical industries where it makes it possible to control multivariable control problems. Since these controllers contain the dynamic relationships between variables it can predict in the future how variables will behave. Based on these predictitions, actions can be taken now to maintain variables within their limits.
- In the complex semiconductor industry where several hundred steps with multiple re-entrant possibilities occurs, APC plays an important role for control the overall production.
Terminology
Manipulated Variables (MVs) are variables where advanced controllers send setpoints to. Controlled variables (CVs) are variables that normally need to be controlled between limits. Disturbance variables (DVs) are only used as an input to the controller, they cannot be influenced, but when measured contribute to the predictability of the CV.
Commercial products
Commercial multivariable control applications include DMCplus from Aspen Technologies, RMPCT from Honeywell and Connoisseur from Invensys.
External links
- Article about Advanced Process Control.
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