Smith模糊PID匀速升温控制策略研究  

Research on the Control Strategy of Smith Fuzzy PID for Uniform Heating Up Process

作　　者：王晓娜[1] 左晓菲[1] 张辉[2] 杨遂军[1] 叶树亮[1] 

机构地区：[1]中国计量学院工业与商贸计量技术研究所,浙江杭州310018 [2]浙江省计量科学研究院,浙江杭州310013

出　　处：《自动化仪表》2015年第1期87-90,共4页Process Automation Instrumentation

基　　金：国家质检公益性行业科研专项基金资助项目(编号:201310102-1)

摘　　要：针对电加热炉匀速升温过程模型建立困难、调节过程滞后等问题,提出了一种基于炉体散热补偿的Smith模糊PID控制算法。通过炉体散热补偿建立针对被控量升温速率的一阶线性纯滞后模型;采用Smith预估器消除纯滞后特性带来的影响,提高系统的稳定性,加快调节过程;引入模糊PID控制,克服Smith预估补偿环节鲁棒性差的弱点,实现参数的自适应调整,并提高了稳态精度,实现了高精度的匀速升温控制。试验结果表明,该控制策略的控制偏差低于5%,明显优于常规PID控制。Aiming at the problems existing in the uniform heating up process for electric furnace, i. e. , difficult to establish the model, and lagged regulation, etc. , the Smith fuzzy PID control algorithm based on furnace heat dissipation compensation is proposed. In accordance with the heating up rate of controlled object, the first order linear dead time model is established through furnace heat dissipation compensation. The influence brought by the dead time characteristic is eliminated by Smith predictor to improve the stability of system and accelerate the regulation process. The weakness of poor robustness of Smith predictor is overcome by introducing fuzzy PID control. Thus the self-adaptive regulation of the parameter is implemented and the steady state accuracy is enhanced for realizing high precise uniform heating up control. The results of experiments show that the control deviation of this control strategy is less than 5%, significantly better than conventional PID control.

关 键 词：电加热炉 匀速升温 Smith控制 模糊控制 炉体散热补偿 

分 类 号：TP273.3[自动化与计算机技术—检测技术与自动化装置]