Course PEF3006 Process Control Fall 2018 Feedforward Control

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Presentation transcript:

By Finn Aakre Haugen (finn.haugen@hit.no) Course PEF3006 Process Control Fall 2018 Feedforward Control By Finn Aakre Haugen (finn.haugen@hit.no) PEF3006 Process Control. USN. F. Haugen. 2018

Why feedforward control? Faster disturbance compensation and/or Faster setpoint tracking (important only with time-varying setpoint) PEF3006 Process Control. USN. F. Haugen. 2018

Control system with both feedforward and feedback: PEF3006 Process Control. USN. F. Haugen. 2018

Example 1: Feedforward in level control system Simulator Let's derive the feedforward controller (it is quite easy). Skala: LTLine brukerforum, 9.1.18: Minikurs i regtek. F. Haugen.

Example 2: Feedforward control in a temperature control system (We will run a simulator of this example.) PEF3006 Process Control. USN. F. Haugen. 2018

Example cont.: How to derive the feedforward controller: (1) Process modelling: Energy balance: (2) The feedforward controller is obtained by solving for the control variable, and substituting the process variable by its setpoint: Can it be implemented? Find out by inspecting the right-hand side! All terms must have known values. Which sensors are needed? PEF3006 Process Control. USN. F. Haugen. 2018

Feedforward control in temperature control system Example cont.: Simulator: Feedforward control in temperature control system PEF3006 Process Control. USN. F. Haugen. 2018

Example 3: Feedforward in a DP system( dynamic positioning) 8 Simulator: Feedforward in DP system PEF3006 Process Control. USN. F. Haugen. 2018

PEF3006 Process Control. USN. F. Haugen. 2018 9 Experimental feedforward PEF3006 Process Control. USN. F. Haugen. 2018

Structure of control system: 10 Structure of control system: PEF3006 Process Control. USN. F. Haugen. 2018

Relation between disturbance measurement and 11 Relation between disturbance measurement and steady-state control signal (with PID controller): PEF3006 Process Control. USN. F. Haugen. 2018

Example 1: Temperature control of air heater 12 PEF3006 Process Control. USN. F. Haugen. 2018

PEF3006 Process Control. USN. F. Haugen. 2018 Example 1 cont. 13 Pot.meter voltage Potensio- meter Air flow (fan speed) Temp at outlet PEF3006 Process Control. USN. F. Haugen. 2018

Without feedforward (only feedback): 14 PEF3006 Process Control. USN. F. Haugen. 2018

With feedforward (and feedback) 15 Improvement? PEF3006 Process Control. USN. F. Haugen. 2018

PEF3006 Process Control. USN. F. Haugen. 2018 Example 2: Feedforward from inlet temperatur (Tp_inn) in temp. control of heat ex. Simulator PEF3006 Process Control. USN. F. Haugen. 2018