PID Control with Gain Scheduling and PID Tuning
Objective of the Application
Using gain scheduling, i.e. an operating-point-oriented parameter control, the quality of control can be improved significantly. The scheduling implies a feedforward adaptation of parameters according to a defined schedule in opposite to an adaptive controller, which permanently identifies its process model based on new measurement data.
The application example considered here shows a control loop with PID controller and gain scheduling based on the corresponding process tag type of the SIMATIC PCS 7 Advanced Process Library.
The following main points are discussed in this application note:
- How to create an instance and set the parameters of the process tag type.
- How to determine the process model and the control parameters. The usage of the PCS 7 PID Tuner is explained firstly for linear processes, and afterwards for a nonlinear process.
- Benchmark simulations with and without gain scheduling, to show the potential benefits.
This entry was created with SIMATIC PCS 7 V7.1, the procedure is transferable to PCS 7 V7.0 and higher versions.
01/2019 First release