按照火電廠鍋爐給水加藥過程的主要因果關系，抽象出一條因果鏈。針對其大時滯特性，提出分段預估控制方法，選取合適的測量點和測量變量，將大時滯分成三段較小時滯的子系統，對每一個子系統進行預估控制，各子系統之間依托因果鏈傳遞預估和控制信息，最終完成整個系統的控制。仿真結果表明此種方法對于大時滯系統的控制具有理想的控制效果。
關鍵詞: 大時滯；因果鏈；分段預估控制
Abstract: According to the basic causality of power plant feedwater process, one causality chain is elicited. In view of its long time-delay characteristic, piecewise prediction and control method is proposed. Chooseproper survey points and survey variables, long time-delay system is divided by three shorter time-delay subsystems. Design prediction and control
for every subsystem, depend on the causality chain to transmit prediction and control information, finally achieve to the integrated system control. Simulation indicates that this method processes excellent effect for control long time-delay systems.
Key words: long time-delay; causality chain; piecewise prediction and control