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Research of Modified Smith-predictor Application in Supercritical Unit Steam Temperature Control System
Author(s): Zhang Jiahui, Wang Wenlan, Li Zhiming, Feng Yongxiang, Man Wencheng, Kang Xiao
Pages: 40-
44,70
Year: 2015
Issue:
11
Journal: North China Electric Power
Keyword: 超临界机组; 汽温控制; Smith预估控制器; 优化策略; 仿真;
Abstract: 针对Smith预估控制在模型失配时,系统控制品质变差的缺陷,提出了一种改进的Smith预估控制模型对汽温被控对象进行补偿.在不知道被控对象的数学模型的情况下,通过构造一个标称的Smith预估器,将其与被控对象并联,系统输出与标称模型输出偏差通过所构造的通用控制器反馈到被控对象的输入,可以克服系统的不确定性.结合带有滞后环节的二阶被控对象进行仿真,仿真结果表明该方法可以有效地克服系统滞后及不确定性的影响,改善系统的控制品质.
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