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对高温高压化学传感器检测校正平台的温度控制系统进行了分析,建立了系统优化的数学模型。该系统存在两级滞后,而且受到环境温度和反应釜内热液流速的干扰,普通PID控制不能及时对干扰产生抑制作用,而使控制系统出现较大超调,温度波动较大,控制系统的动态性能很差。而化学传感器检测校正需要的温度条件非常苛刻,对温度的控制精度要求极其严格,所以需要一种新的解决办法。介绍了一种对系统的两级滞后环节采用PID和双Smith预估反馈的方法。在系统MATLAB仿真和实际试验中得到了良好的效果,满足系统的精度要求。
The temperature control system of high temperature and high pressure chemical sensor detection and correction platform was analyzed, and the mathematical model of system optimization was established. The system has two levels of lag and is disturbed by the ambient temperature and the hydrothermal flow rate in the reactor. The ordinary PID control can not suppress the interference in time, causing the control system to overshoot more and the temperature fluctuates greatly. The control system Dynamic performance is poor. The chemical sensor detection and calibration needs of the temperature conditions are very harsh, the temperature control accuracy requirements are extremely strict, so the need for a new solution. A method of using PID and double Smith estimation feedback to the two-stage hysteresis of the system is introduced. In the system MATLAB simulation and practical experiments have been good results to meet the accuracy requirements of the system.