线性菲涅尔系统空管预热模型分析及变占空比跟随控制应用研究  

Air tube preheating model of linear Fresnel systems and application of variable duty ratio following control

作　　者：张志勇[1,2] 马军 王成龙[1] 夏养君 ZHANG ZhiYong;MA Jun;WANG ChengLong;XIA YangJun(National Engineering Research Center for Technology and Equipment of Environmental Deposition,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Opto-Technology and Intelligent Control Ministry of Education,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学国家绿色镀膜技术与装备工程技术研究中心,兰州730070 [2]兰州交通大学光电技术与智能控制教育部重点实验室,兰州730070

出　　处：《中国科学：技术科学》2021年第3期315-323,共9页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:52066010)资助项目。

摘　　要：通过分析影响线性菲涅尔集热效率的关键因素,建立线性菲涅尔系统光热效率模型,基于该模型提出了一种适用于线性菲涅尔系统空管预热的变占空比跟随控制方法.通过实时数据计算每个预热周期内系统的聚光占空比,实现线性菲涅尔系统恒速率预热控制.通过MATLAB模拟不同时刻及不同辐照(DNI)下预热过程系统聚焦占空比,并将该方法应用于敦煌熔盐菲涅尔示范电站空管预热.实验结果表明,该控制方法能够很好地实现线性菲涅尔系统集热管空管恒速率预热控制.与常规定占空比预热方式相比,在满足真空集热管温升速率要求的前提下,该方法能够有效缩短系统整体预热时间,实现最大效率太阳资源利用.Through the analysis of the key factors that affect linear Fresnel collection efficiency,a thermal efficiency model for linear Fresnel systems is established.On the basis of the model,a suitable method of variable duty cycle following control is used for the hollow tube preheating of linear Fresnel systems.Through calculating the system concentrated duty ratio in each preheating cycle based on the real-time data,the linear Fresnel system constant speed control is achieved.MATLAB is used to simulate the focus duty ratio of the preheating system under different time and different irradiation,and the method is applied to the air tube preheating of Dunhuang molten salts in a Fresnel demonstration station.Experimental results show that compared with commonly prescribed duty ratio preheating methods,the proposed control method can achieve a constant rate of preheating control of the hollow tube in the linear Fresnel system under the premise that the requirements of hollow-tube temperature rise rate are met.Furthermore,the method can effectively shorten the overall preheating process to achieve maximum efficiency of solar resource utilization.

关 键 词：太阳能 线性菲涅尔 空管预热 变占空比 跟随控制 

分 类 号：TM615[电气工程—电力系统及自动化]