光伏发电系统中逆变器性能评价

光伏发电系统中逆变器性能评价陆虎瑜逆变器是一种将直流电转换为交流电的电力电子装置。随着光伏发电系统的日益推广，逆变器的用量也在不断增加。因此，对逆变器的技术性能进行科学的评价，使用户正确地选用光伏发电系统中的逆变器就显得十分重要了。鉴于目前我国尚未制...     

整体煤气化联合循环(IGCC)发电系统

文章对IGCC发电系统的发展与现状作了介绍，并对不同型式的IGCC的发电系统进行了性能计算，比较、分析了它们的优缺点。     

西藏4kW风/光互补发电系统优化设计

根据在西藏一个实际村庄的风、光资源和负载特性，利用美国可再生能源实验室开发的混合发电系统性能模拟软件“Ｈｙｂｒｉｄ２”，模拟并比较了在该村庄利用风／蓄、风／光／蓄、光／蓄系统解决其基本生活用电的技术经济可行性。模拟结果指出，风／光／蓄混合发电系统是该村庄最适合的发电系统。文中还对风／光／蓄发电系统进行了优化设计。通过改变风资源数据，利用“Ｈｙｂｒｉｄ２”模拟和优化设计不同风速时的发电系统，结果显示在西藏那曲地区利用风／光混合发电系统解决无电村庄居民的供电问题是可行的。     

国外空间太阳能热动力发电系统发展及建议

空间太阳能热动力发电系统作为一种新型的空间供电方式，在费用上和性能上已经显示出了很大的优势，有可能成为未来的空间供电方式。国外对于它的研究已经超过40年。通过介绍空间太阳能热动力发电系统的工作原理和技术发展，并且与其它电源系统、主要是光伏系统进行技术比较，显示出这种供电方式的的较大优势。重点介绍了NASA 2kW空间太阳能热动力发电系统地面样机的部件、结构和试验。根据国外研究经验，提出了空间太阳能热动力发电系统研究的建议。     

风能-太阳能互补独立发电系统设计优化与分析

提出了一种风能-太阳能互补发电系统的优化设计方法.在经济技术性能分析过程中引入了Pareto最优的概念来确定最优系统方案.实例计算表明:使用该优化设计方法可以获得系统经济技术性能与系统配置的关系和大量的Pareto最优解,从而可以得到最满意的系统方案.风能发电和太阳能发电具有互补性,风能-太阳能互补发电系统的经济技术性能优于单一的风能发电或太阳能发电系统.     

30千瓦风／光互补联合发电系统

风／光互补发电系统利用风能、太阳能的互补特性，可提高系统供电的稳定怀和可靠性，减小储能蓄电池的容量，降低系统成本，３０ｋＷ风／光互补联合发电系统已在山东省即墨市小管岛安装运行。该系统包括五台５ｋＷ风力发电机，５０４０ＷＰ光电池、２２０ＫＷｈ蓄电池、３０ｋＶＡ逆变器等。本文介绍了该系统的组成和参数，控制策略、运行方式以及数据采集与处理系统，并给出了性能试验结果。     

发电系统的可靠性成本-效益分析

定量分析了发电系统电源容量和系统可靠性水平之间的关系，提出了利用成本一效益分析法确定发电系统最优可靠性的理论方法。并用该方法整合发电系统的可靠性计算模型及缺电损失计算模型，建立了发电系统最优可靠性数学模型，用于确定发电系统的最优可靠性及对应的系统电源容量。利用该方法对某市的发电系统进行了实例计算，得到了该市发电系统的最优可靠性水平及其对应的系统容量。分析的结果表明：该可靠性水平所对应的系统容量具有最大的投资净效益。图5表1参5     

漂浮式光伏发电系统的发电性能研究

漂浮式光伏发电技术是未来光伏发电的应用方向之一。在同一地点建立了1座6.3 kW漂浮式光伏发电系统及1座6.3 kW陆上光伏发电系统,分别对其发电性能进行数据采集与分析。试验表明,漂浮式光伏发电系统的总发电量比陆上光伏发电系统高2%,总体发电效率更高,漂浮式光伏发电系统降低温度损耗对系统发电功率的影响较明显。     

风/光发电系统数据监测与远程通讯

阐述了风／光发电系统的数据监测与远程通讯、远程数据浏览和远程数据访问。分析了该监测系统在评价风／光互补独立运行发电系统的各器件的效率、性能、各部件的匹配以及系统优化设计等方面所起到的指导作用。     

高温燃料电池与燃气轮机相结合的混合发电系统

高温燃料电池与燃气轮机相结合的混合发电系统具有高效、环保和可靠的特性,这种新颖的混合发电系统在未来分布式发电领域具有广阔的应用前景。有不少专家和学者对其系统构成度匹配、系统性能等问题做了大量研究。目前已有高温燃料电池与燃气轮机混合发电系统成功运行,但仍有很多问题需要进行进一步的研究和探索,以使该混合发电系统早日实现商业化运行。本文综述了高温燃料电池与燃气轮机混合发电系统的研究现状,展望了该混合发电系统在未来的研究度发展前景。     

Hydrogen energy storage system in a Multi‒Technology Microgrid:technical features and performance

The features and performance of a hydrogen energy storage system included in the microgrid powering a plant for advanced green technologies is presented. The microgrid is powered by a 730–kW photovoltaic source and four energy storage systems. The hydrogen storage system consists of a water demineralizer, a 22.3–kW alkaline electrolyzer generating hydrogen, its AC–DC power supply, 99.9998% hydrogen purifier, 200-bar compressor, 200–L gas storage cylinders, a 31.5–kW proton–exchange–membrane fuel cell running on hydrogen, its DC–AC power conditioning system. The whole system is housed in three containers provided with anti–salt filters to remove brine. The whole system is controlled by the microgrid system supervisor. Operative tests at nominal power show that the round-trip efficiency of the hydrogen energy storage system at full power is ca. 10% in a pure electric operation and ca. 24% in a heat cogeneration operation. At half power these values reduce to 9.5% and 18%, respectively.     

两级TFE_TUR复合地热发电系统热力学分析及能量利用率优势

本文在单级复合系统基础上,进一步提出两级TFE—TUR复合地热发电系统,并对其进行了热力学分析,给出了一、二级最佳中间匹配温度计算式。同时,还将该系统与单级复合系统、全流系统及常规闪蒸系统作了比较,表明该系统可望成为(火用)效率最高的地热发电系统。     

纯低温余热发电系统的优化分析

通过建立纯低温余热发电系统的热力学模型,计算分析了过热蒸汽压力、进口烟气温度和节点温差等因素对纯低温余热发电系统发电性能的影响.结果表明:在设计纯低温余热发电系统时,存在一优化过热蒸汽压力,使得纯低温余热发电系统的单位烟气发电功率最大;随着进口烟气温度的升高,系统单位烟气发电功率增大,对应的优化过热蒸汽压力升高;而随着节点温差的增大,系统单位烟气发电功率减小,对应的优化过热蒸汽压力降低.     

Simulation of a pilot solar chimney thermal power generating equipment

A pilot experimental solar chimney thermal power generating equipment was set up in China. A simulation study was carried out to investigate the performance of the power generating system based on a developed mathematical model. The simulated power outputs in steady state were obtained for different global solar radiation intensity, collector area and chimney height. By intercomparison, it is found that the simulated power outputs are basically in agreement with the results calculated with the measurements, which validates the mathematical model of the solar chimney thermal power generating system. Furthermore, based on the simulation and the specific construction costs at a specific site, the optimum combination of chimney and collector dimensions can be selected for a required electric power output.     

Grid connected fuel cell and PV hybrid power generating system design with Matlab Simulink

Renewable energy sources have been taken the place of the traditional energy sources and especially rapidly developments of photovoltaic (PV) technology and fuel cell (FC) technology have been put forward these renewable energy sources (RES) in all other RES. PV systems have been started to be used widely in domestic applications connected to electrical grid and grid connected PV power generating systems have become widespread all around the world. On the other hand, fuel cell power generating systems have been used to support the PV generating so hybrid generation systems consist of PV and fuel cell technology are investigated for power generating. In this study, a grid connected fuel cell and PV hybrid power generating system was developed with Matlab Simulink. 160 Wp solar module was developed based on solar module temperature and solar irradiation by using real data sheet of a commercial PV module and then by using these modules 800 Wp PV generator was obtained. Output current and voltage of PV system was used for input of DC/DC boost converter and its output was used for the input of the inverter. PV system was connected to the grid and designed 5 kW solid oxide fuel cell (SOFC) system was used for supporting the DC bus of the hybrid power generating system. All results obtained from the simulated hybrid power system were explained in the paper. Proposed model was designed as modular so designing and simulating grid connected SOFC and PV systems can be developed easily thanks to flexible design.     

我国天然气分布式能源发展制约因素及对策研究

天然气分布式能源比传统火力发电效率提高1倍以上,具有综合能效高、清洁环保、安全性好、削峰填谷等优点。国家已对天然气分布式能源发展提出了明确要求,但我国在发展过程中仍存在一些制约因素,如宣传力度不够,社会认知度低,观念亟待更新;法规不完善,部门之间利益博弈现象突出;优惠政策不配套;电网的技术条件、计量和控制方式、设计程序及基础设施等也存在限制条件;天然气分布式能源系统的关键部件严重依赖进口,核心技术有待突破;企业自身运营中存在投资成本大、回收期长,设备运行以及燃料成本过高等制约因素。推动我国天然气分布式能源发展要坚持5个基本原则,即保本微利、积极培育原则,先行先试、以点带面原则,收益共享、成本均摊原则,合理补偿原则和优质高价原则,并要处理好与电力公司和天然气公司的关系,以及与城市规划和能源总体规划的关系。建议应加强国家宏观层面的统筹管理,细化地方发展规划;完善法律法规建设,突破现行体制障碍;给予天然气分布式能源项目财税优惠,出台价格分摊和价格补贴政策,降低企业运营成本,缓解价格矛盾;另外,应加快构建技术标准,突破技术瓶颈,鼓励上中下游各方参与,加快示范项目建设,不断完善政策体系。     

HSE—TUR复合地热发电系统研究

本文对HSE-TUR(螺杆膨胀机—汽轮机)复合地热发电系统作了详细研究。通过与相应的全流和闪蒸系统的比较,证明该系统优势明显,所用螺杆机机体尺寸小,是一实用高效的新型地热发电系统。     

提升西北电网水（火）电机组一次调频性能的措施

为了适应西北电网大规模外送的要求,提高西北电网频率稳定性,西北电力调度通信中心对于西北电网内水(火)电机组的一次调频性能提出了整改措施,该措施将机组一次调频贡献电量、响应行为等指标作为考评发电企业的考评标准,确定了水(火)电机组一次调频性能考评办法、计量计算方法、信息披露方法。实践表明,该整改措施提高了西北电力系统在直流闭锁、大容量机组跳闸时系统频率的稳定性。     

Analysis of output power smoothing method of the solar chimney power generating system

Severe fluctuation of the output power is a common problem in the generating systems of various renewable energies. The concept of output power fluctuation factor of renewable energy power generating systems was put forward in this paper. Aiming to decrease the fluctuation factor of output power in solar chimney power generating systems (SC), a novel hybrid energy storage system made of water, and sandstone was employed to replace the traditional sandstone energy storage system. The mathematical models of fluid flow, heat transfer and power generating features of SC were established and the influences of material, depth, areas and location of the energy storage layer upon output power were analyzed. The simulation results indicated that adopting the hybrid energy storage of water and sandstone can effectively decrease the fluctuation factor of SC output power and hence smooth the SC output power. In addition, according to the largest daily power generating capability or the smallest peak fluctuation factor, the corresponding optimum depth of the water energy storage layer would be 5 cm or 20 cm, respectively. Copyright © 2012 John Wiley & Sons, Ltd.