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Performance of Oman transmission system with distributed generation 阿曼分布式发电输电系统性能分析
Omar H. Abdalla, H. Al-Hadi, H. Al-Riyami
The paper presents simulation studies of installing distributed generation (DG) at a number of grid stations in the main transmission system of Oman. The diesel-engine driven generator units are required on a temporary basis to aid in meeting the peak demand. A digital model is developed to simulate the system including power plants, transmission system, loads and the proposed DG. The simulation studies are performed by using the DIgSILENT software package. The objective of the studies is to demonstrate effects of the DG in improving system performance in terms of voltage profile, line and transformer loadings, and transmission losses. The results include comparison of the contribution of individual generation at each site and the case with all proposed distributed generators installed.
本文对阿曼主输变电系统多个并网站安装分布式发电系统进行了仿真研究。柴油发动机驱动的发电机组是临时需要的,以帮助满足高峰需求。建立了包括电厂、输电系统、负荷和建议DG在内的数字模型。利用DIgSILENT软件包进行仿真研究。这些研究的目的是证明DG在改善电压分布、线路和变压器负载以及传输损耗方面对系统性能的影响。结果包括对每个站点的单独发电贡献的比较,以及与所有建议安装的分布式发电机的情况。
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引用次数: 4
Sizing optimization and analysis of a stand-alone WTG system using hybrid energy storage technologies 采用混合储能技术的单机WTG系统尺寸优化与分析
P. Bajpai, Sowjan Kumar, Navneet Kishore
Decentralized distributed generation technologies based on renewable energy recourses such as Solar PhotoVoltaic (SPV)/ Wind Turbine Generators (WTG) address the major issues concerned with conventional diesel generators to a large extent and are therefore considered as emerging alternate power solutions to stand alone applications. Three stand alone WTG power systems using different energy storage technologies, i.e. WTG-Battery system, WTG-Fuel Cell (FC) system and WTG-FC-Battery system are optimized and compared in this paper. The analysis of such hybrid systems feeding a standalone load of 45.6 kWh/day energy consumption with a 2.3 kW peak power demand is carried out using Hybrid Optimization Model for Electrical Renewable (HOMER) software. Based on simulation results, it was found that WTG-FC-Battery hybrid system is most economic solution compare to either single storage system. Cost sensitivity analysis with wind speed is also performed in this paper.
基于可再生能源的分散式分布式发电技术,如太阳能光伏(SPV)/风力涡轮发电机(WTG),在很大程度上解决了传统柴油发电机的主要问题,因此被认为是独立应用的新兴替代能源解决方案。本文对采用不同储能技术的WTG- battery系统、WTG- fuel Cell (FC)系统和WTG-FC- battery系统三种独立的WTG电力系统进行了优化和比较。使用可再生电力混合优化模型(HOMER)软件对此类混合系统进行了分析,该系统为45.6 kWh/天的独立负载提供能量消耗,峰值功率需求为2.3 kW。仿真结果表明,WTG-FC-Battery混合储能系统是两种单一储能系统最经济的解决方案。本文还进行了考虑风速的成本敏感性分析。
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引用次数: 18
Augmented heat transfer in rectangular duct with angled Z-shaped ribs 直角z形肋的矩形管道强化传热
M. Pimsarn, Parkpoom Sriromreun, P. Promvonge
An experiment is focused on the design of the suitable ribs used for enhancing heat transfer in a rectangular duct heat exchanger by using wall heat transfer (Nusselt number), friction loss (friction factor) and thermal performance (thermal enhancement factor) data. The Z-shaped ribs were set on the rectangular duct at 30°, 45° and 60° and flat rib was set at 90° relative to the air flow direction. Reynolds numbers studied ranging from 5000 to 25,000 in the test section. The rectangular duct has aspect ratio, AR = 10 and height, H = 30 mm with the Z-rib height (e), e/H = 0.2 and the rib pitch (P), P/H = 3. The ribs were fitted in Z-shape (Z-rib) aligned in series on the whole area of the upper plate. The results of the Z-ribs show the significant increase in heat transfer rate and friction loss over the smooth channel. The 45° Z-rib provides the highest increase in the heat transfer rate and the best thermal performance
利用壁面传热(努塞尔数)、摩擦损失(摩擦系数)和热工性能(热增强系数)数据,设计了矩形管道换热器中用于强化传热的合适肋板。矩形风管在相对气流方向30°、45°和60°处设置z形肋,在相对气流方向90°处设置平肋。在试验段研究的雷诺数范围为5000 ~ 25000。矩形风管长径比AR = 10,高度H = 30mm,纵肋高度e = e/H = 0.2,纵肋间距P = P/H = 3。肋在上板的整个区域上以z形(Z-rib)串联排列。结果表明,在光滑通道上,z形肋的传热速率和摩擦损失显著增加。45°z型肋提供了最高的传热率和最佳的热性能的增加
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引用次数: 16
The first medium wind/diesel pilot project in Thailand 泰国首个中型风力/柴油试点项目
Supakorn Saengsrithorn, Pairach Kitworawut
Since 2005, the people in Koh Tao (Tao Island) has electrified from diesel generation for 24 hours a day. The total installed capacity of diesel generator (DEG) is 6 MW but they cannot supply electricity at rated output because of the life time of each DEG. The average of rated output of DEG can be supplied to load is around 60% of rated output. In 2009, the maximum load at Koh Tao was 3.2 MW and minimum load was 1.4 MW. The energy reserve of DEGs is 400 kW. At this island it has a problem of power quality especially in high season of travelling because the electric energy demand is rapidly growth. Other problem is loss of profit of Provincial Electricity Authority (PEA) because PEA provides and supply electricity to load. The electricity tariff at this island is around 3.5 baht/kWh (0.11 $US/kWh) which is same rate with mainland but the capital cost of electricity is around 8 baht/kWh (0.24 $US/kWh). PEA loses money about 6.5 million baht (0.2 M.USD) per month. PEA attempts to reduce loss of profit and improve the power quality by using wind energy which measured the potential more than two years. The 1 × 250 kW wind turbine has installed at mountain range of Chalok Baan Kao.
自2005年以来,桃岛的居民每天24小时都使用柴油发电。柴油发电机组的总装机容量为6兆瓦,但由于每台柴油发电机组的使用寿命,不能以额定输出功率供电。柴油发电机组的平均额定输出功率约为额定输出功率的60%左右。2009年,岛岛的最大负荷为3.2兆瓦,最小负荷为1.4兆瓦。DEGs的能量储备为400kw。在这个岛上,由于电力需求的快速增长,特别是在旅游旺季,电力质量存在问题。另一个问题是省电力局(PEA)的利润损失,因为PEA为负荷提供和供应电力。该岛的电价约为3.5泰铢/千瓦时(0.11美元/千瓦时),与大陆的电价相同,但电力的资本成本约为8泰铢/千瓦时(0.24美元/千瓦时)。PEA每月损失约650万泰铢(20万美元)。PEA试图通过使用风能来减少利润损失并改善电能质量,该项目已经测量了两年多的潜力。1 × 250千瓦的风力涡轮机已安装在Chalok Baan Kao山脉。
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引用次数: 3
Building on local knowledge, distribution and support networks: Examples of intervention on pico-hydropower in the Lao PDR 以当地知识、分配和支持网络为基础:老挝人民民主共和国微型水电干预实例
M. Smits
This article shows the characteristics, use, and interventions of market-driven pico-hydropower turbines in the Lao PDR to emphasise the importance of building on local knowledge, distribution and support networks for rural electrification. Privately owned pico-hydropower (<2 kW) is the most prolific form of off-grid rural electrification in the northern provinces of Laos. Its relatively wide utilisation relies on the extensive network of Chinese and Vietnamese traders and Lao shop owners to distribute the turbines and the spare parts, and on local knowledge of end-users on the choice of the location, installation, use and load management of the systems. Despite its comparative advantages over solar home systems, diesel generators, micro-hydropower, and other forms of off-grid rural electrification, there are some issues related to safety, load management, seasonality, and the supply chain. The ongoing interventions by the pico-hydropower team at the Lao Institute for Renewable Energy (LIRE) to overcome these issues are used as an example of an approach that builds upon the local knowledge, distribution and support networks of pico-hydropower in Laos. These include ways to share and disseminate information, the implementation of a 2 kW community pico-hydropower system as a demonstration of best practice for replication, testing turbines and accessories, and policy advocacy.
本文展示了老挝人民民主共和国市场驱动的微型水力涡轮机的特点、用途和干预措施,以强调建立当地知识、分布和支持网络对农村电气化的重要性。私人拥有的微型水电(<2千瓦)是老挝北部省份最多产的离网农村电气化形式。其相对广泛的利用依赖于中国和越南贸易商和老挝店主的广泛网络来分销涡轮机和备件,以及最终用户在选择位置、安装、使用和系统负荷管理方面的当地知识。尽管与家用太阳能系统、柴油发电机、微型水电和其他形式的离网农村电气化相比,它具有相对优势,但仍存在一些与安全、负荷管理、季节性和供应链相关的问题。老挝可再生能源研究所(LIRE)的微型水电小组为克服这些问题正在进行的干预,作为一个例子,说明了一种建立在老挝微型水电的当地知识、分布和支持网络基础上的方法。这些措施包括分享和传播信息的方式,实施2千瓦社区微型水电系统作为最佳做法示范,测试涡轮机和配件,以及政策宣传。
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引用次数: 1
Effect of inlet water temperature and flow rate on cooling efficiency of a radiant ceiling system in Taiwan 台湾某辐射吊顶系统进水温度及流量对制冷效率的影响
W. Chiang, Jian-Sheng Huang, Yen-Hsiang Huang
This study is to test the cooling capacity of radiant ceiling system established in a typical office. The dimension of the test chamber is 10 (Length), 7.6 (Width), and 3.85 meter (Height). The objective of this research is to figure out different supplying water temperature accompanies flow rate embedded in radiant ceiling panels with a water circulatory system, which influences the cooling and energy efficiency of the test room. The heat transfer principles of radiation and natural convection are used to remove the sensible heat from the studied office without using any additional mechanical ventilation system to provide forced convection. We adopt five conditions of inlet water temperature 16, 18, 20, 22, and 24 °C with water flow rate 40, 60, 80, and 100 LPM (liter per minute) to test the vertical temperature gradient inside the room and discuss the interactive effects between the parameters within one hour. The experimental values reveal that the better operative efficiency occurs as the inlet water temperature is 18 °C and flow rate is 100 LPM without condensation water on the radiant panel surface. The obtained results also indicate the radiative heat flux of radiant ceiling system using in the subtropical region in Taiwan.
本研究是在一个典型的办公室中测试辐射吊顶系统的制冷量。试验箱尺寸为10米(长)、7.6米(宽)、3.85米(高)。本研究的目的是找出不同的供水温度和流量嵌入带水循环系统的辐射顶板,对试验室的冷却和能源效率的影响。利用辐射和自然对流的传热原理,在不使用任何额外的机械通风系统来提供强制对流的情况下,将显热从所研究的办公室中移除。我们采用进水温度为16、18、20、22、24℃,流速为40、60、80、100 LPM(升/分)5种条件,测试室内垂直温度梯度,并讨论1小时内各参数之间的交互作用。实验结果表明,当进水温度为18℃,流量为100 LPM时,辐射板表面无冷凝水,运行效率较高。所得结果也反映了在台湾亚热带地区使用的辐射顶棚系统的辐射热通量。
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引用次数: 0
Comparative analysis of upstream petroleum fiscal systems of Pakistan, Thailand and other countries with medium ranked oil reserves 巴基斯坦、泰国等中等石油储量国家上游石油财政制度比较分析
S. Zahidi
Governments and Investors are both interested in the petroleum fiscal systems operating in various countries. Governments aim to attract investors, whereas investors are continually searching for markets which provide the rewards commensurate with the risk they will take. Using fiscal tools, governments can make their upstream petroleum regimes more attractive to investors, by providing greater rewards. Therefore, fiscal tools are important for the management and best exploitation of national oil resources. Although many factors can influence attractiveness of a particular upstream petroleum regime, such as the individual geological attractiveness of a particular prospect, costs of exploration and production or the risk profile of a country or concession, yet, by holding all such factors constant, a model has been built that allows the comparison of various countries in terms of fiscal systems only. The research undertaken compares the current upstream petroleum fiscal systems of countries with closely similar oil reserves to those of Pakistan. Turkey, Cameroon, Congo, and Thailand are the randomly selected countries; however any country with similarly ranked oil reserves could have been selected for comparison. Take Statistics have been used to determine the global competitiveness of upstream petroleum fiscal systems of the five countries.
各国政府和投资者都对各国的石油财政制度感兴趣。政府的目标是吸引投资者,而投资者则不断寻找能够提供与其所承担风险相称的回报的市场。利用财政工具,政府可以通过提供更高的回报,使其上游石油制度对投资者更具吸引力。因此,财政工具对国家石油资源的管理和最佳开发至关重要。虽然许多因素可以影响特定上游石油制度的吸引力,例如特定勘探区的个别地质吸引力、勘探和生产成本或一个国家或特许权的风险概况,但是,通过保持所有这些因素不变,已经建立了一个模型,仅允许在财政制度方面对各国进行比较。所进行的研究比较了石油储量与巴基斯坦非常相似的国家目前的上游石油财政制度。土耳其、喀麦隆、刚果和泰国是随机选择的国家;然而,任何石油储量排名相似的国家都可以被选中进行比较。采用统计数据来确定五国上游石油财政体系的全球竞争力。
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引用次数: 3
Preventive maintenance optimization for excitation system of bhumibol hydro power plant 普密蓬水电站励磁系统预防性维修优化
S. Pansrisu, S. Premrudeepreechacharn
Power plant reliability is highly related to the way maintenance tasks on system equipments are performed. From operation record of bhumibol hydro power plant between 2002–2006, the unplanned outage hours (uoh) of power plant are varied. The main factor of uoh is mostly caused by excitation system of power plant. Therefore, the maintenance system of excitation system has to be revised in order to improve of reliability of power plant.
电厂的可靠性与系统设备维护任务的执行方式密切相关。从普密蓬水电站2002-2006年的运行记录来看,电站的计划外停运时数是变化的。电厂的励磁系统是影响机组运行的主要因素。因此,为了提高电厂的可靠性,必须对励磁系统的维护制度进行修改。
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引用次数: 7
Study of Deep Ocean Water (DOW) cooling energy and DOW industry 深海水(DOW)冷却能源与DOW工业的研究
H. Hou, Yih-Cheng Hou, Yen Lee
Sea Water Air Conditioning (SWAC) takes advantage of available deep cold seawater to make the chilled water in one and more building to become cool. The design of a basic seawater air conditioning system is presented in this research. These basic components can be optimized for each special location, climate and building. DOW Industry is devoted to temperature control refined organic agriculture, cultivate fishery and cooling system. Multi-purpose Development of Deep Ocean Water is described in this paper.
海水空调(SWAC)利用可用的深冷海水,使一个或多个建筑物中的冷冻水变得凉爽。本文介绍了一种基础海水空调系统的设计。这些基本组件可以针对每个特殊的位置、气候和建筑进行优化。陶氏工业致力于精细有机农业的温控、养殖渔业和制冷系统。本文介绍了深海水的多用途开发。
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引用次数: 4
Assessing the fuel consumption and GHG of future in-use vehicles 评估未来在用车辆的燃料消耗和温室气体排放
J. Heywood
Over the next several decades, substantial reductions in greenhouse gas emissions from transportation will be required. The targets—an 80% reduction by 2050—are challenging. Thus, we need quantitative methodologies for assessing the impact of changes in vehicle technology and use, and of fuels, on transportation energy consumption and GHG emissions. This paper describes an appropriate methodology for creating plausible future transportation scenarios and assessing their impacts. It focuses on light-duty vehicles (cars and light trucks), in the U.S. and European context. The factors that must be included are: more efficient propulsion systems; vehicle weight changes; performance, size and other vehicle attributes; and now rapidly the deployment of these improved technologies can grow over time. The methodology combines engineering assessments of vehicle performance for the different propulsion and vehicle technologies, a model of the in-use vehicle fleet, and the availability of the various possible fuels. The findings show there is significant potential for reducing petroleum consumption and GHG emissions through improvements in engines, transmissions, vehicle weight reduction, and alternative fuels.
在接下来的几十年里,需要大量减少交通运输产生的温室气体排放。到2050年减排80%的目标是具有挑战性的。因此,我们需要定量的方法来评估车辆技术和使用以及燃料的变化对运输能源消耗和温室气体排放的影响。本文描述了一种适当的方法来创建合理的未来交通情景并评估其影响。它专注于美国和欧洲的轻型车辆(轿车和轻型卡车)。必须考虑的因素有:更高效的推进系统;车辆重量变化;性能、尺寸等车辆属性;现在,随着时间的推移,这些改进技术的部署可以迅速增长。该方法结合了对不同推进和车辆技术的车辆性能的工程评估、正在使用的车辆车队模型以及各种可能燃料的可用性。研究结果表明,通过改进发动机、变速箱、减轻车辆重量和替代燃料,在减少石油消耗和温室气体排放方面存在巨大潜力。
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引用次数: 9
期刊
Proceedings of the International Conference on Energy and Sustainable Development: Issues and Strategies (ESD 2010)
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