Auto disturbance rejection control based on Smith predictor in SCR denitrification system

JIANG Jiaguo; GUO Weimin; LIU Yanquan; TANG Yaohua

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Auto disturbance rejection control based on Smith predictor in SCR denitrification system

Thermal Power Generation Vol. 45, Issue 1, Pages: 54-59(2016)

更新时间：2025-09-28

- Auto disturbance rejection control based on Smith predictor in SCR denitrification system
- 作者机构：
  
  1. 华北电力大学控制与计算机工程学院
  2. 国网河南省电力公司电力科学研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC： X773
- Published：2016
- 稿件说明：
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JIANG Jiaguo, GUO Weimin, LIU Yanquan, et al. Auto disturbance rejection control based on Smith predictor in SCR denitrification system[J]. Thermal Power Generation, 2016, 45(1): 54-59.
DOI：

JIANG Jiaguo, GUO Weimin, LIU Yanquan, et al. Auto disturbance rejection control based on Smith predictor in SCR denitrification system[J]. Thermal Power Generation, 2016, 45(1): 54-59. DOI：

摘要

针对选择性催化还原(SCR)脱硝系统的大时滞、非线性和时变性

提出Smith预估器与自抗扰控制相结合的控制方法。利用Smith预估器对系统时滞环节进行补偿

使时滞被控量超前反映到控制器

以缩短调节时间;利用自抗扰控制对SCR脱硝系统Smith预估器模型的误差和扰动量进行估计和补偿以提高模型精度。仿真结果表明

与常规PID控制、Smith预估控制及常规自抗扰控制相比

基于Smith预估的自抗扰控制对SCR脱硝系统的控制效果更佳

可有效提高控制系统的抗扰能力和模型适应能力。

Abstract

For the large time delay

nonlinear and time varying of the selective catalytic reduction(SCR)system

a control method based on the Smith predictor and auto disturbance rejection control(ADRC)was proposed.In order to shorten the adjustment time

the Smith predictor was used to compensate the system delay

thus the controlled quantity feeds back to the controller in advance.In order to enhance the accuracy of the model

the ADRC was applied to estimate the errors of the Smith model predictor and disturbances

and compensate them.The simulation results show that the ADRC based on Smith predictor can effectively improve the control effect of the SCR denitrification system

and improve the anti disturbance ability of the system.

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