按照火电厂锅炉给水加药过程的主要因果关系，抽象出一条因果链。针对其大时滞特性，提出分段预估控制方法，选取合适的测量点和测量变量，将大时滞分成三段较小时滞的子系统，对每一个子系统进行预估控制，各子系统之间依托因果链传递预估和控制信息，最终完成整个系统的控制。仿真结果表明此种方法对于大时滞系统的控制具有理想的控制效果。关键词: 大时滞；因果链；分段预估控制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 controlfor 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
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