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Feedforward Control ( 前馈 控制 )

Feedforward Control ( 前馈 控制 ). Lei Xie Institute of Industrial Control, Zhejiang University, Hangzhou, P. R. China 20 13. Contents. Feedforward Concept Design of Linear Feedforward Controllers Design of Nonlinear Feedforward Controllers Design Examples of Feedforward Control

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Feedforward Control ( 前馈 控制 )

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  1. Feedforward Control (前馈控制) Lei Xie Institute of Industrial Control, Zhejiang University, Hangzhou, P. R. China 2013

  2. Contents • Feedforward Concept • Design of Linear Feedforward Controllers • Design of Nonlinear Feedforward Controllers • Design Examples of Feedforward Control • Feedforward-Feedback Control • Simulation Results • Summary

  3. Problem Discussion Consider the heat exchanger shown in the figure, it is required to control the outlet temperature of process fluid, T, by manipulating the steam flow, RV. Please design the relevant control schemes on the diagram for the following cases: Case #1: both of the flow, RF, and steam inlet pressure, PV, are stable; Case #2: RF is stable, but PV varies frequently; Case #3: PV is stable, but RF varies frequently; Case #4: both of PV and RF varies frequently.

  4. Feedback or Feedforward Control Examples Feedback Control Scheme Feedforward Control Scheme

  5. Feedforward Concept D1(t), …, Dn(t) represent some measurable disturbances to the controlled variable Idea: to compensate for some measurable disturbances before they affect the controlled variable.

  6. Feedforward / Feedback Control

  7. Design of Linear Feedforward Controllers Design Objective:

  8. Design of Linear Feedforward Controllers (cont.) Design formula for the feedforward controller: Design Objective:

  9. Design of Linear Feedforward Controllers (cont.) Design formula for the feedforward controller: ( Why ? )

  10. Types of Feedforward Controllers • Steady-State or Dynamic Feedforward Controller (静态前馈控制与动态前馈控制) • Linear or nonlinear Feedforward Controller (线性前馈控制与非线性前馈控制) Discuss the common-used feedforward controller

  11. Simulation Results of Linear Feedforward Controllers (Please see…/FFControl /ExHeaterLinearFFC.mdl)

  12. Nonlinear Steady-state Feedforward Control Steady-state Equation Discuss the realization of nonlinear feedforward controller and the effect of relevant measurements

  13. Nonlinear Steady-State Feedforward Control Simulation (Please see …/FFControl/ExHeaterStaticFFC.mdl)

  14. Comparison of Feedforward and Feedback Control

  15. FFC+FBC Scheme #1 for Heat Exchanger Steady-state output and smooth switch problem ?

  16. FFC+FBC Scheme #2for Heat Exchanger

  17. Summary • Cases which may introduce feedforward control (1) Primary Controlled Variable is not measurable (2) Primary CV is measurable, but some disturbances are too strong for feedback control systems • Conditions to apply feedforward control (1) Main disturbances are measurable (2) Response speed of disturbance path is slower than that of control path (3) Characteristics of disturbance and control path are almost invariable

  18. Thanks a lot !

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