What is APC (Advanced Process Control)?
APC stands for Advanced Process Control and refers to a collection of advanced control techniques applied on top of basic PID control in order to operate industrial processes more optimally, more stably and more efficiently.
APC helps organisations to save energy, improve quality, reduce variability and make better use of operating limits — particularly in complex or dynamic production processes.
🧠 How does APC work?
Unlike standard control loops (such as PID), APC works with process models and uses mathematical and statistical methods to:
- Control multiple variables simultaneously (multivariate)
- Make predictions based on trends and Process Values
- Adjust proactively rather than purely reactively
📦 Examples of APC techniques
| Technique | Description |
|---|---|
| Model Predictive Control (MPC) | Predicts future process behaviour from a model |
| Feedforward control | Compensates for disturbances before they have an impact |
| Real-time optimisation | Continuously optimises processes within operational limits |
| Soft sensors | Virtual measurements derived from calculations or models |
| Constraint handling | Respects process and safety limits |
🏭 Typical applications
- Chemical and petrochemical processes
- Refineries and gas plants
- Food and beverage production (e.g. fermentation control)
- Pharmaceutical batch reactors
- Power stations and heat exchangers
- Advanced fermentation processes
✅ Benefits of APC
- Higher yield and lower cost
- Less process variability and more consistent product quality
- Better utilisation of plant and raw materials
- Faster response to process disturbances
- Lower energy and utility consumption
📌 In summary
Advanced Process Control (APC) uses smart models and predictive algorithms to make industrial processes more efficient, safer and more consistent — typically on top of existing PID control.