Results 71 to 80 of about 1,562 (168)
Zhejiang Daxue xuebao. Lixue ban, 2014 川东北元坝地区近年来在上三叠统须家河组(T3x)及中下侏罗统千佛崖组(J2q)和自流井组(J1z)陆相地层发现工业性气藏.它们的化学成分和碳同位素组成存在明显差别，具有不同的成因和来源.须家河组天然气烷烃中以甲烷为主，干燥系数在0. 96以上.其上、下部地层天然气碳同位素组成变化显著，T3x3~5气层乙烷碳同位素较重，δ13C2值（-25.2‰~-20.7‰）均大于-26‰，为典型的高-过成熟煤型气；而T3x1~2天然气δ13C2值大多数小于-28‰，主要在-32‰~-28‰，具有高 ...
HUWei(胡炜) +4 more
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Effect of Hydrogen Production System on Sub-Synchronous Oscillation Characteristics of Doubly Fed Induction Generator Systems With Series Compensation [PDF]
ObjectivesThe grid-connected operation of large-scale wind turbines increases the risks of sub-synchronous oscillation (SSO) in power systems, to address these issues, this study conducts an in-depth analysis of the effect of hydrogen production systems ...
LIU Zenan, LU Yanan, XU Tao
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Shuitu Baochi Xuebao, 2018 为了研究黄土残塬沟壑区典型林地枯落物和土壤水文特性，并对黄土残塬沟壑区造林树种的选择及功能导向型林分改造提供依据，于2017年在山西省吉县蔡家川流域选择刺槐林、油松林、刺槐×油松混交林为研究对象，分别采用浸泡法、环刀法对林地枯落物层和土壤层持水性能进行定量化研究，探究其水源涵养功能。结果表明：（1）3种林地枯落物总储量在105.49～148.38 t/hm2之间变动，且半分解层储量大于未分解层储量；油松×刺槐混交林地枯落物总厚度最大（3.8 cm），刺槐林次之（3.6 cm），油松林最小（3.4 cm）；
侯贵荣 +6 more
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Development Status and Prospect of Key Technologies for Liquid Hydrogen Production-Storage-Transportation-Refueling [PDF]
ObjectivesLiquid storage and transportation is one of the effective ways to realize large-scale and long-distance storage and transportation of hydrogen and ensure the large-scale application of hydrogen energy.
LUO Xuepeng, ZHANG Jie
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Ship hydrogen-electric hybrid power system model and life cycle carbon emission assessment method [PDF]
ObjectivesA life cycle carbon emission assessment method is proposed to comprehensively evaluate the carbon emission reduction capacity of hydrogen-electric hybrid ships.
Cong GUAN, Li CHEN, Yue CHU
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Gaoya dianqi针对含质子交换膜燃料电池（proton exchange membrane fuel cell，PEMFC）的氢储能系统频率控制问题，为提高氢储能系统的频率稳定性，提出了一种基于虚拟参数自调节的系统频率控制策略。其中，电氢耦合系统以PEMFC为依托，光伏、储能电池为辅助，通过PEMFC、光伏、储能电池三者混合向系统综合负荷供电。通过数学模型构建，观察出系统内发生微小扰动后，PEMFC及储能电池的动态响应变化，改变虚拟控制参数，调整系统内的功率分配。由于PEMFC和储能电池动态响应时间不同 ...
李建林 +4 more
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Development and Challenge of Flexible Operation Technology of Thermal Power Units Under New Power System [PDF]
Under the background of “dual carbon”, new energy sources have begun to be connected to the grid on a large scale. However, the randomness and volatility of new energy generation significantly impact the power grid, making it urgent to build a new power ...
LI Qi +5 more
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Gaoya dianqi, 2015 高压绝缘子参数监测系统主要实现对高压绝缘子状态的在线监测,其供电电源是关键问题之一,要求电源长期免维护﹑高可靠性与稳定性。文中采用由蓄电池与超级电容器混合储能的光伏发电电源,根据负载及储能系统的特点提出了能量管理策略,光伏发电电源采用单向DC/DC单向变换器进行最大功率控制,超级电容与蓄电池采用双向DC/DC变换器与系统进行能量的双向交换。结果表明,该控制策略能在光伏电池输出功率波动的情况下,直流母线电压保持稳定,且能有效减少蓄电池的充放电循环次数,优化充放电性能,延长使用寿命 ...
李华柏
doaj
Low-Carbon and Economic Synergy Optimization Configuration for Microgrid With Hydrogen Energy Storage [PDF]
ObjectivesTraditional electric energy storage has limitations in scale, duration, and environmental impact.Moreover, the renewable energy absorption capacity in the microgrid is low, and low-carbon and economy cannot be taken into account in planning. In
GUO Peixuan +5 more
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Gaoya dianqi, 2016 超级电容器因其功率密度大、质量轻、无污染、可多次充放电等优点而成为一种新型的储能装置,目前,超级电容器的应用范围也不断拓展,在工业、消费电子、通讯、医疗器械、国防、军事装备、交通等领域得到越来越广泛的应用。从小容量的特殊储能到大规模的电力储能,从单独储能到与蓄电池或燃料电池组成的混合储能,超级电容器都展示出了独特的优越性。随着输电系统整体结构的不断变化 ...
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