粮食烘干过程中基于Smith滑模的温度控制  

Temperature control based on Smith sliding mode in grain drying process

作　　者：郭利进[1] 王浩[1] GUO Li-jin;WANG Hao(Electrical Engineering and Automation College,Tiangong University,Tianjin 300000,China)

机构地区：[1]天津工业大学电气工程与自动化学院,天津300000

出　　处：《粮食与油脂》2021年第11期97-100,162,共5页Cereals & Oils

基　　金：国家自然科学基金青年科学基金(61203333);天津市自然科学基金青年项目(16JCQNJC03800);天津市应用基础与前沿技术项目(15JCYBJC47800)。

摘　　要：粮食烘干过程中对温度的控制是保障粮食品质的关键因素。由于为粮食烘干塔提供热风的热风炉具有时变、强耦合和非线性的特点,传统的PID控制难以满足工艺控制要求。针对热风炉温度的特点,提出了基于Smith预估的自适应全程积分滑模控制算法。利用Smith预估补偿系统中的滞后;利用滑模控制的鲁棒性克服系统模型的不确定性和变工况情况下的复杂干扰;利用自适应全程积分滑模面消除滑模抖振;并进行了仿真。结果表明,与常规PID控制器相比较,基于Smith预估的自适应全程积分滑模控制器在鲁棒性和控制精度方面有明显提升。The control of temperature in the process of grain drying was the key factor to ensure the quality of grain.Because of the time-varying,strong coupling and non-linear characteristics of hot blast stoves that provide hot air for grain drying towers,traditional PID control was difficult to meet process control requirements.According to the characteristics of hot air furnace temperature,an adaptive full-scale integrated sliding mode control algorithm based on Smith prediction was proposed.Smith was used to predict the hysteresis in the compensation system;the robustness of the sliding mode control was used to overcome the uncertainty of the system model and the complex interference under the variable working condition;the adaptive full-scale integrated sliding surface was used to eliminate the sliding mode chattering;and the simulation was carried out.The results showed that compared with the conventional PID controller,the adaptive whole process integral sliding mode controller based on Smith prediction has obvious improvement in robustness and control accuracy.

关 键 词：粮食烘干 温度控制 Smith预估 滑模控制 

分 类 号：TS210.1[轻工技术与工程—粮食、油脂及植物蛋白工程]