基于增量式PID控制的锅炉温控系统设计

Design of boiler temperature control system based on incremental PID control

针对传统水温调节多采用人工经验以及半电气自动化等方式,以及这些方式存在结构单一、水温波动较大以及稳定性差等问题,设计一种基于增量式PID矫正控制系统。控制系统基于增量式PID矫正控制系统采用热电阻作为温度敏感元件,为减少热电阻本身导线电阻引起的测量误差,采用基于三线制的热电阻温度数据采集电桥电路。由于热电阻存在一定的非线性区间,根据实验温度数据与其热电阻本身电阻比较,计算出其矫正系数,以此减少数据输出误差。最后设计并制作实验样机,结果表明根据样机获得的数据验证理论分析的正确性。

The traditional water temperature regulation adopts manual experience and semi-electrical automation. These methods have the problems of single structure, large water temperature fluctuation and poor stability. Therefore, a PID correction control system based on increment is designed. Based on incremental PID correction control system, thermal resistance is used as temperature sensitive element, and a three-wire thermal resistance temperature data acquisition bridge circuit is designed. According to the experimental temperature data and its thermal resistance, the correction coefficient is calculated to reduce the data output error. Finally, the experimental prototype is designed and made to verify the correctness of the theoretical analysis according to the data obtained from the prototype.