定日镜光斑偏差处理系统设计

发布时间：2018-09-14 12:41

【摘要】：塔式太阳能热发电系统以其清洁性、发电质量稳定等优点成为太阳能利用领域的重要发展方向,定日镜作为塔式发电系统的主要组成部分,完成对太阳光能的聚集工作,其聚光过程的精度与稳定性对电站的发电功率及电站设备的安全具有重要意义,是塔式系统中的一个重要研究方向。本文主要以定日镜的开环控制系统为研究对象,从定日镜的聚光过程、光斑中心点与聚光目标点的偏差测量、光斑中心偏差数据处理等方面进行设计,实现定日镜在校正下的光斑偏差处理过程。本文的研究重点和创新成果有以下几点:(1)研究定日镜开环控制系统中的聚光过程,分析太阳位置计算与定日镜实时聚光过程分离的控制策略。(2)使用由相机、白板与图像处理算法组成的光斑偏差测量系统,实现对定日镜反射到白板上光斑偏离白板中心点的偏差值的计算,并结合实际状况中的相机抖动问题,设计了一套实用的定日镜光斑偏差自动计算系统。(3)针对定日镜在校正状态下一天中获取的光斑偏差数据所具有的稀疏性与噪声问题,设计了改进的极限学习机算法(ELM),实现对定日镜光斑偏差数据的有效拟合,获得较为可靠的光斑偏差变化曲线。(4)基于以上研究内容,设计了一套自动的定日镜光斑偏差处理系统,实现定日镜校正状态下光斑图像向光斑偏差变化曲线的转换,最终对该系统进行仿真验证。本文工作实现定日镜光斑偏差处理系统的设计,经验证能较好得到定日镜的光斑偏差变化规律,对定日镜转轴在聚光过程中的角度偏差计算具有重要意义。
[Abstract]:Tower solar thermal power generation system has become an important development direction in the field of solar energy utilization because of its advantages of cleanliness and stable quality of power generation. As the main component of tower power generation system, the solar thermal power generation system accomplishes the gathering of solar light energy. The accuracy and stability of the process of concentrating light is of great significance to the power generation of power station and the safety of power station equipment. It is an important research direction in tower system. In this paper, the open-loop control system of the sun-fixing mirror is taken as the research object. It is designed from the aspects of the focusing process of the sunspot, the measurement of the deviation between the spot center and the focus point, the data processing of the spot center deviation, etc. The processing process of spot deviation under correction of sunspot mirror is realized. The key points and innovative achievements of this paper are as follows: (1) the focusing process in the open loop control system of the helioscope is studied, and the control strategy for the separation of the solar position calculation from the real-time focusing process of the sunspot mirror is analyzed. (2) the camera is used. The measurement system of spot deviation, which is composed of whiteboard and image processing algorithm, can calculate the deviation value of spot deviation from the center point of whiteboard reflected by the sun-fixing mirror, and combine with the camera jitter problem in the actual situation. A set of practical automatic calculation system for spot deviation of sunspot mirror is designed. (3) aiming at the problem of sparsity and noise of spot deviation data obtained from sunspot mirror in correction state one day, The improved extreme learning machine (ELM),) algorithm is designed to effectively fit the spot deviation data of the helioscope, and a reliable curve of spot deviation is obtained. (4) based on the above research, a set of automatic processing system for spot deviation of sunspot mirror is designed. The transformation from spot image to spot deviation curve is realized in the state of sunspot correction. Finally, the system is simulated and verified. In this paper, the design of the spot deviation processing system for sun-fixing mirror is realized. It is proved that the variation law of spot deviation of sunspot mirror can be well obtained, which is of great significance to the calculation of angle deviation of the turning axis of sun-fixing mirror in the process of concentrating light.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM615

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