共查询到19条相似文献,搜索用时 218 毫秒
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针对现有太阳能跟踪装置使用率低的问题,文章设计了一种新型的太阳能双轴跟踪装置。该太阳能跟踪装置以STC89C51单片机为核心,采用光电跟踪和视日轨迹跟踪相结合的混合跟踪方法,方位轴和高度轴均采用蜗杆蜗轮传动结构。同时,根据跟踪装置的机械结构、控制系统硬件电路和驱动程序设计出了跟踪装置模型,并对模型进行试验。实验结果表明,该太阳能双轴跟踪装置相比于固定式跟踪装置,可有效提高太阳能的使用率。该跟踪装置为高效率太阳能产品的设计提供了一定的理论依据。 相似文献
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基于松下PLC的太阳能跟踪系统设计 总被引:1,自引:1,他引:0
为了提高太阳能的利用率,提出以松下PLC为基础的太阳能跟踪系统.该系统根据太阳的运动规律,计算得到当地的高度角、方位角,通过PLC对装置进行程序控制,并通过光电传感器的反馈信号来纠正累积误差,从而精确地跟踪太阳,最大限度地提高太阳能利用率. 相似文献
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对于具有滞后特性的伺服刀架系统,采用自校正PID控制。在此基础上,为进一步提高伺服刀架系统的跟踪精度,提出了反复反馈误差补偿控制方法。理论分析和实验结果都表明,该控制方法以有效地提高伺服刀架的跟踪精度。 相似文献
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2011年12月22日,世界装机规模最大的太阳能全跟踪光伏电站——中国恩菲工程技术有限公司宁夏天景山30兆瓦光伏电站成功并网发电。该电站全部采用中国恩菲自主研发的智能联动跟踪系统,将实现年均发电量5400万千瓦时,高于传统电站25%。 相似文献
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针对基于BP神经网络的光伏最大功率点跟踪(MPPT)控制存在的问题,提出了一种适用于光伏发电系统的改进型神经网络MPPT控制器。首先对太阳能光伏发电系统中的电池工作原理及其等效电路进行了分析。然后采用BP神经网络和模糊控制相结合对来实现光伏MPPT控制。此外,采用自适应参数对模糊控制器进行了改进。最后,基于BOOST转换电路建构建了光伏电池的matlab/simulink仿真模型。实验结果显示:提出的最大功率点跟踪控制器具有较高的准确性和反应速度,且稳定性较好。 相似文献
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太阳能光伏发电是一种再生的无污染的新能源,挤压铝材是制造这种发电装备有竞争力的可选材料,电池板框架、支柱、支撑杆、拉杆等都可以用铝合金制造。太阳能光伏发电装备铝材可用6061、6063、6082铝合金挤压,平均铝材用量约60 t/MW,减排二氧化碳933 kt/MW。我国云南昆明石林太阳能发电站一期已于2010年5月并网发电,亚洲第一大,仅次于美国及西班牙早些时候建成的。截至2009年底,全球太阳能光伏发电系统装机容量已超过1GW。目前妨碍太阳能大发展的主要障碍是造价过高,建设成本约8 000元/kW。 相似文献
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太阳能电池板输出功率智能控制装置设计 总被引:2,自引:0,他引:2
论文给出了一种太阳能电池板最大输出功率控制装置设计方法,其系统由太阳能电池板、检测电路、DC-DC变换器、控制器、直流负载等部分组成。该装置通过实时采样太阳能电池板输出功率,计算并调整DC-DC变换器占空比,改变负载吸收功率,使太阳能电池板始终输出最大功率,实现太阳能的有效利用。该系统具有性价比高、设计维护方便、工作稳定可靠的优点。 相似文献
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White anodized thermal control coating on LY12 aluminum alloy 总被引:1,自引:0,他引:1
Wu Xiaohong Qin Wei Cui Bo Jiang Zhaohua Lu Weiqiang He Weidong 《Journal of Materials Processing Technology》2008,200(1-3):405-409
The thermal control coating with low solar absorptance that can be used in the thermal control system of the spacecraft are gained by in situ growth on the LY12 aluminum alloy. In this article, the optical properties, thickness and microstructure of the anodized coating were studied by spectrophotometer, thickness gauge and AFM, respectively. The influence of various operating parameters, viz., temperature, current density, and anodizing time, on the optical properties of the coating was investigated. Results show that the thicknesses of the coating, size and density of micropores have important influence on the optical properties of the coating. Less size and density of micropores, higher reflectance could be gained on the base of enough thickness of the coating. Therefore, white anodized thermal control coating could be prepared by optimizing the process parameters. 相似文献
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光伏发电存在间歇性的缺点,需要一个可持续的储能系统来满足需求。介绍光伏-PEM(质子交换膜)储氢系统,将电能转化为氢气储存,后期再通过PEM 燃料电池将氢气转化为电能。该系统包含光伏发电系统、PEM制氢电解槽以及燃料电池等,通过电解水产生氢气,氢气在高压下储存在压缩储罐中以备后用,后期系统有需要时,氢气将通过PEM燃料电池重新转化为电能。光伏发电系统的输出电流由PI控制器控制,以稳定电解槽的输入电流。对于光伏-PEM储氢系统,主要问题是对天气条件的依赖。通过系统建模来模拟光伏-PEM储氢系统的运行过程,评估与太阳能光伏输出电流相关的光照强度对氢气生产、氢气储存以及后期氢气再电气化的影响,为后续有助于缓解与太阳能、风力发电和其他间歇性发电相关的储能问题奠定基础。 相似文献
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Thomas Eglinton Jim Hinkley Andrew Beath Mark Dell’Amico 《JOM Journal of the Minerals, Metals and Materials Society》2013,65(12):1710-1720
The Australian minerals processing and extractive metallurgy industries are responsible for about 20% of Australia’s total greenhouse gas (GHG) emissions. This article reviews the potential applications of concentrated solar thermal (CST) energy in the Australian minerals processing industry to reduce this impact. Integrating CST energy into these industries would reduce their reliance upon conventional fossil fuels and reduce GHG emissions. As CST technologies become more widely deployed and cheaper, and as fuel prices rise, CST energy will progressively become more competitive with conventional energy sources. Some of the applications identified in this article are expected to become commercially competitive provided the costs for pollution abatement and GHG mitigation are internalized. The areas of potential for CST integration identified in this study can be classed as either medium/low-temperature or high-temperature applications. The most promising medium/low-grade applications are electricity generation and low grade heating of liquids. Electricity generation with CST energy—also known as concentrated solar power—has the greatest potential to reduce GHG emissions out of all the potential applications identified because of the 24/7 dispatchability when integrated with thermal storage. High-temperature applications identified include the thermal decomposition of alumina and the calcination of limestone to lime in solar kilns, as well as the production of syngas from natural gas and carbonaceous materials for various metallurgical processes including nickel and direct reduced iron production. Hybridization and integration with thermal storage could enable CST to sustain these energy-intensive metallurgical processes continuously. High-temperature applications are the focus of this paper. 相似文献
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Thermodynamics of solar-grade-silicon refining 总被引:2,自引:0,他引:2
Solar energy will shortly be in great demand since it is inexhaustible and cleaner than any conventional energy resources. At present, an expensive grade of silicon for semiconductor (SEG-Si) is used for a solar cell to convert solar energy into electricity. However, the amount of supply is limited and we have to develop an innovative process for silicon production with low energy cost in order to spread the solar cell system widely. Using relatively inexpensive metallurgical grade silicon (MG-Si) as a starting material for making solar grade silicon (SOG-Si) is believed to be one of the ways to make solar cells less expensive. Impurities in MG-Si will shorten the lifetime of excited carriers in silicon solar cell and disturb electric generation. Hence, the removal of impurities from silicon is a significant issue in silicon solar cell fabrication. To discuss the possibility and efficiency of the impurity elimination process, evaluation of thermodynamic properties of impurities in molten silicon such as the activity coefficients and the interaction parameters of harmful impurities has been performed. 相似文献