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1.
With the declining costs of flat plate and concentrating photovoltaic (PV) systems, solar PV generation in many sunny regions in Brazil will eventually become cost competitive with conventional and centralized power generation. Detailed knowledge of the local solar radiation resource becomes critical in assisting on the choice of the technology most suited for large-scale solar electricity generation. When assessing the energy generation potential of non-concentrating, fixed flat plate versus concentrating PV, sites with high levels of direct normal irradiation (DNI) can result in cost-competitive electricity generation with the use of high concentrating photovoltaic systems (HCPV). In large countries, where the transmission and distribution infrastructure costs and associated losses typical of centralized generation must be taken into account, the distributed nature of solar radiation should be perceived as a valuable asset. In this work we assess the potential of HCPV energy generation using satellite-derived DNI data for Brazil, a large and sunny country with a continental surface of 8.5 million km2. The methodology used in the study involved the analysis of global horizontal, latitude-tilt, and direct normal solar irradiation data resulting from the Solar and Wind Energy Resource Assessment (SWERA) Project, and an estimate of the resulting electricity production potential, based on a review of HCPV generators operating at other sites. The satellite-derived solar irradiation data, with 10 km × 10 km spatial resolution, were analysed over the whole country, in order to identify the regions where HCPV might present a considerable advantage over fixed plate PV on an annual energy generation basis. Our results show that there is a considerable fraction of the national territory where the direct normal solar irradiation resource is up to 20% higher than the latitude-tilt irradiation availability. Furthermore, these sites are located in the most industrially-developed region of the country, and indicate that with the declining costs of this technology, distributed multi-megawatt HCPV can be a good choice of technology for solar energy generation at these sites in the near future.  相似文献   

2.
This paper discusses the impact of bulk electric storage on the production from dispatchable power plants for rising variable renewable electricity shares. Two complementary optimization frameworks are used to represent power systems with a varying degree of complexity. The corresponding models approximate the wholesale electricity market, combined with the rational retirement of dispatchable capacity. Two different generic storage technologies are introduced exogenously to assess their impact on the system.The analysis covers two countries: France, where the power supply's large nuclear share allows for the discussion of storage impact on a single generator type; and Germany, whose diverse power supply structure enables storage interactions with multiple electricity generators. In the most general case, additional storage capacity increases dispatchable power production (e.g. nuclear, coal) for small wind and solar shares, i.e. it compensates the replacement induced by renewable energies. For larger variable renewable electricity volumes, it actively contributes to dispatchable power replacement. In a diverse power system, this results in storage-induced sequential mutual replacements of power generation from different plant types, as wind and solar capacities are increased.This mechanism is strongly dependent on the technical parameters of the storage assets. As a result, the impact of different storage types can have opposite signs under certain circumstances. The influence of CO2 emission prices, wind and solar profile shapes, and power plant ramping costs is discussed.  相似文献   

3.
针对中国大中型面南的水库电站大坝,向光性比较好,具备安装太阳能光伏发电系统的条件,并使得2种可再生能源融合并网发电模式具有一定的创新性。水库电站的发电系统是已建成的,增加太阳能光伏发电系统并建设融合型并网发电系统,不仅体现了投资成本低发电效益高等特点,同时具有节约国土资源、保护大坝和节能减排等社会效益。在设计和实践过程中,研发了水电与太阳能光伏发电共享型控制系统、光伏逆变谐波抑制及无功补偿系统、水电与太阳能光伏发电共享型直流系统等,这些发明设备与技术在实践应用中取得了良好的效果。研究实践表明,太阳能光伏发电与水库水电站融合型并网发电模式,具有很好的推广应用价值。  相似文献   

4.
Fossil fuel based power generation is and will still be the back bone of our world economy, albeit such form of power generation significantly contributes to global CO2 emissions. Solar energy is a clean, environmental friendly energy source for power generation, however solar photovoltaic electricity generation is not practical for large commercial scales due to its cost and high-tech nature. Solar thermal is another way to use solar energy to generate power. Many attempts to establish solar (solo) thermal power stations have been practiced all over the world. Although there are some advantages in solo solar thermal power systems, the efficiencies and costs of these systems are not so attractive. Alternately by modifying, if possible, the existing coal-fired power stations to generate green sustainable power, a much more efficient means of power generation can be reached. This paper presents the concept of solar aided power generation in conventional coal-fired power stations, i.e., integrating solar (thermal) energy into conventional fossil fuelled power generation cycles (termed as solar aided thermal power). The solar aided power generation (SAPG) concept has technically been derived to use the strong points of the two technologies (traditional regenerative Rankine cycle with relatively higher efficiency and solar heating at relatively low temperature range). The SAPG does not only contribute to increase the efficiencies of the conventional power station and reduce its emission of the greenhouse gases, but also provides a better way to use solar heat to generate the power. This paper presents the advantages of the SAPG at conceptual level.  相似文献   

5.
分布式光伏发电项目有助于实现"能源-经济-环境"的协调可持续发展。针对区域太阳能资源与分布式光伏发电项目的时空耦合关系开展了研究,以北京地区为研究对象,提出运用多种空间分析方法,从空间地理的新视角探索太阳能资源与分布式光伏发电项目之间的关系,针对区域太阳能资源与分布式光伏发电项目开发区域的时空耦合适宜度进行了科学评估。研究成果可为优化光伏发电区域开发的时序提供建议和决策支持,也可为京津冀及其他地区光伏发电项目的规划布局优化提供参考。  相似文献   

6.
介绍了液态铅-铋(LBE)合金的热物理及传热特性,提出了将铅-铋共晶合金用于太阳热发电高温传热工质的构想.并建立了流体传热特性计算模型,对液态铅-铋合金与传统太阳热发电传热工质-熔盐的传热特性进行了对比模拟计算.结果表明:在热力循环中,采用液态LBE合金作为传热工质与熔盐相比,不但具有更高的热效率和热经济性,而且还可大大节省投资成本,因此其作为高温传热工质在太阳能热发电领域具有广阔的应用前景.  相似文献   

7.
A method for appraising the energy cost for a combined solar-wind power plant (SWPP) is described and assessed. It is shown that the best way to reduce the energy cost is to increase the generation time and provide the optimum combination of wind and solar components.  相似文献   

8.
针对双可再生能源融合发电模式的诸多技术难题,提出了一种在水电站大坝上建设太阳能电站并进行融合发电的创新模式,重点突破了水电与太阳能发电共享型控制技术、光伏逆变谐波抑制技术、无功补偿和共享型直流技术等技术难题。水电和太阳能发电共享型控制技术实现了水电现地控制单元、太阳能现地控制单元、共享型公用现地控制单元的分布式构架;实现了光伏对水电的逆变谐波抑制和无功补偿装置的研发;实现了太阳直流技术补偿水电站直流系统。应用实践表明,太阳能与水能融合发电模式可节约投资、增加无功补偿效益、减少国土资源的占用,是双可再生能源融合发电的创新性应用,具有很好的推广价值。  相似文献   

9.
Solar power plants positioned in space for terrestrial electricity use have been proposed due to the ever-rising world energy consumption and its environmental impacts. This idea is analysed here in the context of sustainability of such power generation. To that end we have performed some new economic, environmental and social effects analysis of electricity generation by solar space power plants of both photovoltaic and solar thermal types power using the best currently available technology. The plants in the analysis were assumed to be in different Earth orbits, or on the Moon built by a robotised factory. One of our results is that both economically and environmentally the best scenario may be to launch a thermal solar power plant to the geostationary orbit from the Moon. Electricity produced in this way could be economically competitive to that generated by fossil fuels on Earth already for as few as 100 space power plants of about 5-10 GW each. This option is also deemed socially responsible with its capacity to reduce poverty with large amounts of cheap clean energy, and environmentally friendly, because it produces more than a hundred times less emissions than the same amount of electricity produced from fossil fuels on Earth.  相似文献   

10.
Energy consumption has risen in Malaysia because of developing strategies and increasing rate of population. Depletion of fossil fuel resources, fluctuation in the crude oil prices, and emersion of new environmental problems due to greenhouse gasses effects of fossil fuel combustion have convinced governments to invest in development of power generation based on renewable and sustainable energy (RSE) resources. Recently, power generation from RSE resources has been taken into account in the energy mix of every country to supply the annual electricity demand. In this paper, the scenario of the energy mix of Malaysia and the role of RSE resources in power generation are studied. Major RSE sources, namely biomass and biogas, hydro‐electricity, solar energy, and wind energy, are discussed, focusing more toward the electrical energy demand for electrification. It is found that power generation based on biomass and biogas utilization, solar power generation, and hydropower has enough spaces for more development in Malaysia. Moreover, minihydropower and wind power generation could be effective for rural regions of Malaysia. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

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