Switching Controller Design for Fast Set-Point Tracking

在工廠開車啓動時，常常需要在最短時間內使該工廠單元達到正常操作目標區；又在批次的程序中，常有需要讓反應器溫度能按事先規劃的途徑來操作。上述這些情形大都需要被控制的變數一方面能很快速的達到設定點，再方面需要不能有太大的超越。這對一般的控制器而言是不易達成的。本論文即是針對上述的需求及針對可以用一階或二階帶時延動態表示的化工廠提出一種切換式的控制器。在控制初期，以最大（小）的調節變數量來驅趕該程序。俟系統回饋的現行誤差及其微分之量測值達到所提公式之計算値時，即行切換成常態的PID控制。如此，可達成既快速也沒有超越的控制效果。此一方式的控制可沿用於非線性明顯的工廠。文中用許多數值的例子來說明此一控制的作法及其效果。

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並列摘要

During start-up of the chemical processes, it is preferable to reach standard operating condition in minimum time to increase the time for normal production. In batch processes, frequent set-point changes are needed in reactor temperature to follow optimum temperature trajectory. Both above situations require the controlled variable to reach the new set-point in minimum time with almost no or very little overshoot. In this paper, a simple switching controller design is proposed for chemical processes which can be approximated as first-order or second-order model with dead time. Maximum and/or minimum manipulated variable changes in association with PID controller will be properly utilized to reach the new set-point in minimum time and with no overshoot. The switching point in the controller design is based on the current measurement of the controlled variable or the error signal and the derivative of the error signal which are readily available. The usage of this switching controller design can be extended to highly nonlinear processes under set-point changes. Several numerical examples will be used to illustrate the usefulness of the proposed design.

並列關鍵字

Batch-switch ； PID controller ； Time optimum control ； Set-point tracking ； Dual-mode control

國際替代計量

Switching Controller Design for Fast Set-Point Tracking

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