热气机太阳能热发电技术的发展

随着人们对环境的重视,对能源来源多元性的考虑,太阳能聚焦热发电（CPS）技术在世界上已受到越来越多的重视。碟式热气机太阳能热发电技术作为其中的一种技术在一些国家也得到了迅速的发展。这种技术在试验中体现出了效率高,布置灵活等特点,是未来太阳能热发电技术的选择之一.     

太阳能热发电——太阳能斯特林热发电

本文通过对太阳能热发电,特别是太阳能斯特林热发电的发展和特点进行了叙述,说明了发展太阳能斯特林发电技术的意义和重要性.     

太阳能热发电高温蓄热技术

一前言太阳能热发电技术是除风电以外最有经济竞争力的可再生能源发电技术。太阳能集热器把收集到的太阳辐射能发送至接收器产生热空气或热蒸汽,用传统的电力循环来产生电能,具有技术成熟、发电成本低和容易与化石燃料形成混合发电系统的优点。太阳能高温蓄热技术是太阳能热发电的关键技术。由于太阳辐射强度时刻在变化,太阳能热发电系统在早晚或云遮间隙必须依靠储存的能量维持系     

太阳能热发电技术与系统

我国对大规模太阳能热发电技术的研究仍处于起步阶段,而国外则已进行了多年的研究.本文介绍了各类太阳能热发电技术及其系统,总结了国内外一些学者的研究成果,比较了各类太阳能热发电技术的优缺点.塔式和槽式技术最适用于大规模太阳能热系统.碟式太阳能热发电装置功率较小,适用于分布式能源系统.其它太阳能热发电技术仍处在试验研究阶段.今后的研究重点主要是塔式太阳能热发电系统的系统集成技术和槽式真空吸热管技术.     

太阳能热发电技术的研究

1太阳能发电技术 太阳能发电的方式有多种，主要有通过热过程的“聚热式太阳能热发电（CSP）”。     

国际太阳能热发电研讨会会议纪要

由中国可再生能源学会和中国环境基金共同主办美国新霓空太阳能有限公司协办的国际太阳能热发电研讨会于2006年2月22日在清华大学召开。来自国内外太阳能热发电领域的技术专家、政府官员、投资界人士参加了本次研讨会,本次会议的主题是“太阳能热发电技术进展”。     

太阳能热发电系统的研究开发现状

太阳能热发电是一种很有发展前景的大规模太阳能利用技术。介绍和分析了国内外塔式、槽式、碟式等太阳能热发电技术的研究状况,分析了这些技术的优缺点以及一些改进方案。结合我国国情,指出了我国太阳能热发电所面临的问题及挑战;根据我国可再生能源发展规划,分析了我国太阳能热发电技术的发展前景。     

塔式太阳能热发电系统定日镜场的设计思考

化石燃料的有限储量及其燃烧产物对环境的污染，使得可再生能源的研究和开发日益迫切。太阳能热发电技术作为最有可能引起能源革命、实现大功率发电的可再生能源技术得到了广泛的关注。20世纪80年代以来，美国、以色列、西班牙等国相继建立了不同形式的太阳能热发电示范装置，促进了塔式太阳能热发电技术的发展。美国能源部主持的研究结果表明：在大规模发电方面，塔式太阳能热发电将是所有太阳能发电技术中成本最低的一种。据预测，到2020年，其发电成本约为每度5美分，具有很强的市场竞争力。     

大唐天威甘肃矿区10MW太阳能热发电试验示范项目开工

太阳能热发电并非新鲜事物,国外早有大型太阳能热发电示范性电站,有的已经进行商业化运行。我国从事该项技术研究较早,但成果不多,技术与世界先进水平有差距,虽然有小规模示范,但大规模的太阳能热发电电站尚未开建。随着国际能源形势的变化和太阳能热发电技术的进步,中国的太阳能热发电将翻开新的一页。2010年12月28日,中国首座兆瓦级太阳能槽式热发电试验示范项目——大唐天威(甘肃矿区)10MW太阳能热发电试验示范项目在甘肃举行开工奠基仪式,标志着中国在太阳能热发电领域翻开了实际应用的新篇章。本项目的如期建成运行     

太阳能热发电技术的进展及现状

介绍了槽式、塔式和盘式太阳能热利用发电站的发展史和技术现状.指出槽式太阳能热发电站的功率可至1000MW,是所有太阳能热发电站中功率最大的,其年收益也最高.塔式太阳能热利用发电站的功率可至100MW,与槽式系统相比,在商业上还不成熟.但高温型塔式系统和燃气轮机混合发电或和混合发电站联合发电最具市场化前景.盘式太阳能热发电系统功率5～1000kW,它用在流动场所,应用范围大,除可满足用电需求,还可代替柴油机组.     

风电系统的无功功率与电网电压稳定

论述了风电容量在占局部电网相当比例时,风电机组的无功功率调整与电网电压之间的关系,对于定速和变速风电机组的运行特性做了分析,提出了在需要做无功功率调整时风电机组应能满足的特殊要求。     

New energy power generation-wind power generation

This paper introduced the status quo of wind power and wind power generation technology. Focusing on the introduction of wind power generating system ibrational self-consistent field（VSCF）, program implementation included Alternating Current （AC）-Direct Current （DC）-AC conversion system, magnetic field modulation generator system, doubly-fed generator system etc. Among these, doubly-fed generator system is the trend. Where to build the wind farm is very important, so a perfect site is needed. Wind power generation will have a bright future. As long as the wind power can be linked to the grid in large scale.     

Output power control for large wind power penetration in small power system

Nowadays, wind turbine generator (WTG) is increasingly required to provide control capabilities regarding output power. Under this scenario, this paper proposes an output power control of WTG using pitch angle control connected to small power systems. By means of the proposed method, output power control of WTG considering states of power system becomes possible, and in general both conflicting objectives of output power leveling and acquisition power increase are achieved. In this control approach, WTG is given output power command by fuzzy reasoning which has three inputs for average wind speed, variance of wind speed, and absolute average of frequency deviation. Since fuzzy reasoning is used, it is possible to define output power command corresponding to wind speed condition and changing capacity of power system momentarily. Moreover, high performance pitch angle control based on output power command is achieved by generalized predictive control (GPC). The simulation results by using actual detailed model for wind power system show the effectiveness of the proposed method.     

Output power variations with solar power satellites

The first comprehensive evaluation of output power variations expected from Solar Power Satellites is presented. The various factors are classified in a two tier manner as: deterministic (either periodic or non-periodic) and statistical (either constant with system life or changing with life). The largest variations are due to seasonal periodic factors, namely variations in the solar constant (± 3.3 per cent) and a solar illumination variation with the photovoltaic array held perpendicular to the orbit plane (± 4.2 per cent). Other key factors delineated which are being quantified presently include power reductions due to microwave power tube failure and silicon solar cell radiation damage, while multiple shadowing of adjacent power stations in geosynchronous orbit and rectenna structural factors and combining efficiency variations are representative of areas that need further study.     

Microthermophotovoltaic power generator with high power density

A promising energy source for portable MEMS devices, microthermophotovoltaic (micro-TPV) power generator, is described in this paper. The system mainly consists of a micro SiC combustor, and a GaSb photovoltaic (PV) cell array and a simple nine-layer dielectric filter, with a volume of about 3.1 cm³. When the flow rate of H₂ is 4.2 g/h, and H₂/O₂ ratio is 0.7, the system is able to deliver 3.06 W electrical power, the open-circuit voltage and short-circuit current are 2.31 V and 1.74 A, respectively, the result is a power density of about 1.0 W/cm³ (1 MW/m³). The effect of all kinds of factors on the performance of the micro-TPV system is also discussed in this paper.     

Got power? [power engineers recruitment]

This paper discusses the different factors that can help to ensure that the future demand for power engineers will be met. These factors include the articulation of a compelling mission, development of a comprehensive strategy, execution of supporting tactics, and demonstration of leadership.     

Modeling market power in Korea's emerging power market

The Korean power market is being formed from the unbundled generation, transmission and distribution assets of Korea Electric Power Corporation. The KEPCO generation has been allocated to six independent gencos with a combined generating capacity of 46,629 MW in 2002. This gave an 11% margin over the peak load that year (41,921 MW).     

Wind power and market power in competitive markets

Average market prices for intermittent generation technologies are lower than for conventional generation. This has a technical reason but can be exaggerated in the presence of market power. When there is much wind smaller amounts of conventional generation technologies are required, and prices are lower, while at times of little wind prices are higher. This effect reflects the value of different generation technologies to the system. But under conditions of market power, conventional generators with market power can further depress the prices if they have to buy back energy at times of large wind output and can increase prices if they have to sell additional power at times of little wind output. This greatly exaggerates the effect. Forward contracting does not reduce the effect. An important consequence is that allowing market power profit margins as a support mechanism for generation capacity investment is not a technologically neutral policy.     

A hybrid power source for pulse power applications

Portable 12 V power supplies are used extensively for communications and power tool applications. These devices demand fast response times of the power supply. Fuel cells are generally best suited to continuous power applications and require an initial warm-up period, although they offer the prospect of increased operational duration over a battery for a given weight of portable system. This paper investigates the combination of specific energy performance from the fuel cell system with the specific power and response time of the battery. Two separate hybrid systems have been developed and tested; a planar, 20-cell, polymer electrolyte membrane fuel cell (PEMFC) stack together with either a lead–acid or nickel/cadmium battery; and a conventional 20-cell, bipolar, PEMFC stack. Both systems have been tested under pulse-load conditions at temperatures between −20°C and +40°C, and for comparison, the individual components have undergone similar tests. The hybrid systems have successfully operated continuously for several weeks under load profiles that the fuel cell alone could not sustain.     

Environmental/economic power dispatch with wind power

Economic environmental dispatch (EED) is a significant optimization problem in electric power system. With more wide spread use of wind power, it is necessary to include wind energy conversion system (WECS) in the EED problem. This paper presents a model to solve the EED problem incorporating wind power. In addition to the classic EED factors, the factors accounting for overestimation and underestimation of available wind power in both economic and environmental aspects are also considered. In order to obtain some quantitative results, the uncertain characteristic of available wind power and the performance of WECS are determined on the basis of the statistical characteristic of wind speed. The optimization problem is numerically solved by a scenario involving two conventional generators and two wind-powered generators. The results demonstrate that the allocation of system generation capacity may be influenced by multipliers related to the cost for overestimation and underestimation of available wind power, and by the multiplier related to the emissions for underestimation of available wind power. Nevertheless, the multiplier related to the emissions for overestimation of available wind power has little impact on the allocation. Taking account of economic factors, environmental factors and impacts of wind power penetration, the proposed EED model is beneficial to finding the right balance between radical and conservative strategy for wind power development.