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自适应太阳跟踪平台理论分析及控制器设计 总被引:1,自引:0,他引:1
本文对太阳跟踪装置的机械结构和控制原理及系统设计做了简单描述,分析太阳与集能平台之间的关系.提出一种自适应太阳跟踪方案,实现对太阳方位角和高度角的双轴自动跟踪,可以广泛应用于需要跟踪太阳的装置中,提高太阳能利用效率. 相似文献
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太阳能集能器自动跟踪装置 总被引:7,自引:0,他引:7
太阳能集能器自动跟踪装置是由传感器、方位角跟踪机构、高度角跟踪机构和自动控制装置组成。自动跟踪装置驱动太阳能集能器 ,使集能器的主光轴始终与太阳光线相平行。当太阳光线发生倾斜时 ,传感器输出倾斜信号 ,指示执行器动作调整太阳能集能器的角度 ,直到太阳能集能器对准太阳 ,实现自动跟踪太阳的目的。在阴天或太阳光辐照度低于工作照度时自动关机 ,太阳光辐照度达到工作照度时自动开机。该装置适用于聚光式太阳能集能器、太阳能电池等需要跟踪太阳的装置 相似文献
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抛物柱面聚焦的几种跟踪方式的光学性能分析 总被引:11,自引:6,他引:11
通过建立的模型计算瞬时太阳直射辐射强度,求出了各种跟踪方式下的太阳光入射角,算出各种跟踪方式下抛物镜开口接收的瞬时太阳直射辐射能,并使用MATLAB处理数据,作出了广州地区在不同季节的辐照度变化图以及广州、北京地区一年中日辐射总量变化图,通过分析图像和数据,对几种跟踪方式的光学性能以及纬度对各种跟踪方式光学性能的影响进行了分析、研究。最后对各种跟踪方式系统使用时遇到的问题进行了讨论。 相似文献
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Loreto Valenzuela Eduardo Zarza Manuel Berenguel Eduardo F. Camacho 《Solar Energy》2005,78(2):301-311
A new prototype parabolic-trough collector system was erected at the Plataforma Solar de Almería (PSA) (1996–1998) to investigate direct steam generation (DSG) in a solar thermal power plant under real solar conditions. The system has been under evaluation for efficiency, cost, control and other parameters since 1999. The main objective of the control system is to obtain steam at constant temperature and pressure at the solar field outlet, so that changes in inlet water conditions and/or in solar radiation affect the amount of steam, but not its quality or the nominal plant efficiency. This paper presents control schemes designed and tested for two operating modes, “Recirculation”, for which a proportional-integral-derivative (PI/PID) control functions scheme has been implemented, and “Once-through”, requiring more complex control strategies, for which the scheme is based on proportional-integral (PI), feedforward and cascade control. Experimental results of both operation modes are discussed. 相似文献
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太阳能利用中的跟踪控制方式的研究 总被引:26,自引:0,他引:26
对太阳能利用中的开环、闭环和混合控制跟踪控制方式的特点进行了分析。通过计算几种单轴跟踪方式的跟踪角,根据跟踪角和太阳的时角间的关系,对单轴跟踪时的控制方式的选择进行了研究。特别是使用了MATLAB程序处理数据,得到南北水平轴跟踪时跟踪角和太阳时角间的关系图像,着重分析了此时采取混合跟踪的可行性和适用性。对几种跟踪控制方式的优缺点进行了分析和总结,分析了他们的特点和适用性。 相似文献
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In order to promote renewable energy, Tunisia has developed a large program to exploitate photovoltaïc systems (PV) to provide electric power in rural electrification. These needs increase continually following standard of living improvements, from lighting and media communication (radio, TV) to motors, refrigeration and pumping. The fluctuation of solar energy on one hand, and the necessity to optimise available solar energy on the other, it is useful to develop new efficient and flexible modes to control motors. A vectorial control of an asynchronous motor fed by a photovoltaïc system is proposed. In this case, the control of the circulating current becomes an important objective in the algorithm design. This paper presents an efficient current controller scheme that can achieve high accuracy and a fast dynamic response of induction machine. This scheme uses voltage decoupling and proportional integral controller loops (PI). Furthermore, to operate the PV array at its maximum power point for every instant, the PV system must contain a maximum power point tracking controller (MPPT). Good static and dynamic performances were obtained in simulation of the proposed structure. 相似文献
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A parabolic solar cooker with automatic two axes sun tracking system was designed, constructed, operated and tested to overcome the need for frequent tracking and standing in the sun, facing all concentrating solar cookers with manual tracking, and a programmable logic controller was used to control the motion of the solar cooker. The results of the continuous test – performed for three days from 8:30 h to 16:30 h in the year 2008 – showed that the water temperature inside the cooker’s tube reached 90 °C in typical summer days, when the maximum registered ambient temperature was 36 °C. It was also noticed that the water temperature increases when the ambient temperature gets higher or when the solar intensity is abundant. This is in favor of utilizing this cooker in many developing countries, which are characterized by high solar insulations and high temperatures. Besides cooking, the proposed cooker could be utilized for warming food, drinks as well as to pasteurize water or milk. 相似文献
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Computing the solar vector 总被引:2,自引:0,他引:2
Manuel Blanco-Muriel Diego C. Alarcn-Padilla Teodoro Lpez-Moratalla MartÍn Lara-Coira 《Solar Energy》2001,70(5)
High-concentration solar thermal systems require the Sun to be tracked with great accuracy. The higher the system concentration, the greater this accuracy must be. The current trend in solar concentrator tracking systems is to use open-loop controllers that compute the direction of the solar vector based on location and time. To keep down the price of the tracking system, the controller is based on a low-cost microprocessor. These two facts impose important restrictions on the Sun position algorithm to be used in the controller, as it must be highly accurate and efficiently computable at the same time. In this paper, various algorithms currently available in the solar literature are reviewed and a new algorithm, developed at the Plataforma Solar de Almería, which combines these two characteristics of accuracy and simplicity, is presented. The algorithm allows of the true solar vector to be determined with an accuracy of 0.5 minutes of arc for the period 1999–2015. 相似文献