基于一阶加纯滞后模型的纺织生产过程温控PI系统设计

Design of Textile Production Temperature PI Control System Based on First Order Plus Pure Dead Time

温度控制系统工艺过程的多样性和纺织生产过程的不确定性,对系统温度控制提出更为严格的要求。本文基于一阶加纯滞后模型,采用可编程控制方法设计了优化的纺织生产过程温度PI闭环控制程序,并采用变频控制方式控制三级加热系统,在可编程控制器(PLC)内存中存储温度控制指令来调节纺织生产过程中的温度,并建立组态王界面与基于PLC S7-200之间的连接,以实现对纺织过程温度及其控制的在线监控。仿真结果表明:基于一阶加纯滞后的PI控制模型温度控制的响应时间比常规PID控制方式缩短了一半多,温度波动性较小,稳定性好,鲁棒性较强,可获得很好的纺织生产过程温度控制曲线,并成功地应用于实际纺织生产温控系统的完善和改造。

More stringent requirements of the temperature control system have been proposed due to the diversity and uncertainty of the temperature control system of the textile production process. Based on the first order plus pure dead time model,the PLC controller was used to design the optimized PI closed-loop control model,the variable frequency control mode was adopted to adjust three level heating system,and the temperature control commands stored in the PLC memory was utilized to adjust the temperature. The connection between Kingview interface and PLC S7-200 was established to achieve its control of on-line monitoring based on the textile process temperature. The simulation results show that the response time of the temperature adjustment in the process of textile production using the optimized PI control model reduces by more than half than that of conventional PID control method,and the optimized PI closed-loop control model can obtain good control curve of the temperature control curve with small temperature fluctuation and good stability,which was successfully applied for improving and transforming the actual temperature control system of textile production.