槽式太阳能集热场温度控制研究

Research on Temperature Control of Trough Solar Collector

为了将槽式太阳能集热回路的导热工质出口温度控制在合理范围内,需要研究调节迅速、控制效果良好的集热场出口温度控制系统。以1 MW槽式太阳能热发电实验系统为研究对象,建立了槽式集热回路动态数学模型,并基于模型开发了集热场导热工质出口温度内模控制器,并基于Simulink仿真平台搭建了集热回路工质出口温度PID控制系统和内模控制系统,对比分析了多扰动情况下2种系统的控制效果。结果表明:在太阳辐照、导热工质入口温度和环境温度的共同作用下,相较于PID控制系统,内模控制系统调节时间更短,超调量更小,控制效果更优。

In order to control the outlet temperature of the heat transfer fluid within reasonable range,it is necessary to develop a fastresponse and effective control system for the outlet temperature in the parabolic trough solar plants.In this paper,a dynamic mathematical model of parabolic trough collector loop was established first,which took the solar field of a 1 MW solar parabolic trough power plant as the research object.And then an internal model controller(IMC)for the outlet temperature of the heat transfer fluid was proposed based on the developed mathematical model.Afterwards the IMC control system and PID control system were built respectively on the Simulink platform such that.the control effects under multiple disturbances were compared and analyzed accordingly.The results show that:under the disturbances of solar radiation,inlet temperature and ambient temperature,the IMC controller demonstrates better control effect with less time duration for control setting and less overshoot in contrast with the PID controller.