基于前馈-自抗扰算法的换热器动态试验温度控制研究

Study on Dynamic Test Temperature Control of Heat Exchanger based on Feedforward-Active Disturbance Rejection Algorithm

为了使换热器试验测控系统满足动态换热试验中对温度控制的要求,分析了试验系统中被控温度对象动态模型,设计了前馈-自抗扰温度控制算法。动态换热试验对象为管壳式换热器,试验过程管程流体为强迫对流换热,壳程流体自然对流换热,同时管程流体循环利用,要求控制管程入口温度稳定。控制算法全面利用模型信息,将壳程温度作为管程温度控制中的干扰,为其设计前馈补偿,同时设计自抗扰控制算法,处理模型偏差问题。利用AMESim软件搭建系统模型,在Simulink中设计控制算法,进行了AMESim/Simulink联合仿真,通过对比多种控制算法,验证了在壳程温度变化干扰的换热过程中,使用前馈-自抗扰控制算法能够使管程入口温度波动更小,更快达到稳定。

In order to meet the temperature parameter control requirements of the heat exchanger test measurement and control system in the dynamic heat transfer test, the dynamic model of the controlled temperature object in the test system is analyzed, and a feedforward-active disturbance rejection control algorithm for temperature is designed. The dynamic heat transfertest object is a shell-and-tube heat exchanger. The test process is heat transfer for forced convection of the fluid in the tube side and natural convection of the fluid in the shell side. During the test, the fluid in the tube side is recycled, and the inlet temperature of the tube side is required to be stable. The control algorithm makes full use of the model information, uses the shell side temperature as the tube side temperature interference to design feedforward compensation for it. At the same time, the active disturbance rejection control algorithm is designed to deal with the model deviation problem.The system model is built by using AMESim software, and a control algorithm is designed by Simulink, so as to conduct the joint simulation for AMESim/Simulink. By comparing with a variety of control algorithms, it can be found that in the heat transfer process of shell side temperature change interference, the use of feedforward-active disturbance rejection control algorithm can make the tube side inlet temperature fluctuation become smaller and achieve stability faster.