基于PID数字控制器的炉温控制系统分析与设计

Analysis and Design of Furnace Temperature Control System Based on PID Digital Controller

为改善工业炉温控制系统的温度变化滞后特性,加强系统本身的稳定性和对多变量性的整合能力,建立基于PID数字控制器的炉温离散控制系统。首先,建立炉温离散控制系统数学模型,分析系统的稳定性和时域响应,确定采样周期和开环增益对系统的影响;其次,采用二级扩充临界比例度法对PID数字控制器进行参数整定;最后,对加入PID数字控制器的离散系统进行仿真分析。实验结果表明,此系统可以改善温度控制与变化的不足,提高响应速度,消除大振荡。

In order to improve the temperature hysteresis characteristic of the industrial furnace temperature control system, strengthen the stability of the system itself and the integration ability of multi-variable, a furnace temperature discrete control system based on PID digital controller was established. Firstly, a discrete mathematical model is established to analyze the stability and time-domain response of the system, and the influence of sampling period and open-loop gain on the system is determined. Secondly, parameter tuning of PID digital controller is carried out by two stage expansion critical proportionality method. Finally, the discrete system with PID digital controller is simulated and analyzed. The experimental results show that the system can improve the inadequacy of temperature control and change, improve the response speed and eliminate the large oscillation.