Results 11 to 20 of about 1,244,096 (165)

支撑新能源基地电力外送的电源组合优化配置策略研究 [PDF]

open access: yes, 2023
新能源基地化开发和电力外送是实现能源电力清洁低碳转型的重要途径。新能源发电间歇性和波动性以及有限的输电走廊资源要求基地配置调节电源以提高新能源电力外送工程的可靠性和源网利用率。提出了基于广域长期历史气象数据,采用时序生产模拟电源扩展优化模型,进行不同送电方案下调节电源与新能源装机优化组合策略的研究方法。以内蒙古沙漠地区新能源基地为例的研究表明,电化学储能为代表的无源型调节电源应配置为外送通道容量的35%左右,从而实现合理的通道利用率和基地发输电经济性;配置有源型调节电源,可实现更高的外送通道利用率 ...
刘泽洪, 金晨, 周原冰
core   +1 more source

考虑光伏消纳的配电网储能与直流选址定容协同规划 [PDF]

open access: yes, 2023
大规模分布式光伏的接入将对配电网的安全经济运行带来重要影响,分布式光伏发电的时效性变化和光伏装机的区域性差异为有效进行新能源消纳带来挑战。为此,通过提出配电网储能与直流线路协同规划架构,针对光伏随时间波动的不平衡,使用储能装置进行电能存储,实现电力的削峰填谷。针对区域光伏分布不均,通过建设直流线路以实现区域间能量互济,消纳光伏溢出区域的发电量。进一步,以投资成本、维护成本和电能费用构成的年综合费用最小为目标,构建储能及直流线路选址定容的交直流配电网优化规划问题,实现区域内和区域间光伏溢出功率的高质量 ...
宁可儿   +5 more
core   +1 more source

Comparing the Effects of Collaborative and Independent Writing on EFL Learners’ Individual Writing Performance: An Intervention Study

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT Collaborative writing has attracted increasing attention in English as a Foreign Language (EFL) instruction due to its potential to enhance learners’ writing competence. However, few studies have examined the comparative effects of collaborative versus independent writing on EFL learners’ individual performance, especially in higher‐order ...
Ting Huang, Chenze Wu, Wenkang Zhang
wiley   +1 more source

考虑光储联合系统参与频率响应的储能容量优化配置方法 [PDF]

open access: yes全球能源互联网, 2018
随着能源危机和环境污染问题的加剧,光伏发电作为可持续的清洁能源受到越来越多的关注,储能在含光伏电力系统中的应用也日益广泛。然而,储能的大规模应用却面临成本高难以推广、收益衡量困难等瓶颈。基于此,考虑光伏-储能联合系统参与系统频率响应后的经济效益,研究光伏电站配置储能的经济性。对储能系统的潜在收益和其应用于电力市场辅助服务的可能性进行讨论,提出一种储能容量优化配置的方法。结果表明,配置储能并参与系统频率响应调整辅助服务能调高光伏电站的总收益。另外,对储能容量优化配置过程中敏感因素的影响进行了分析 ...
金楚, 周博, 艾小猛, 文劲宇
doaj   +1 more source

Farm‐Scale Recharge Pits for Improving Local Groundwater Availability: Insights From a Hardrock Watershed in Rajasthan, India

open access: yesWorld Water Policy, Volume 12, Issue 3, August 2026.
ABSTRACT Groundwater depletion is a major challenge in semiarid, hard‐rock regions where irrigation demands often exceed natural recharge. This study evaluates the effectiveness of farm‐scale recharge pits as a local, supplementary, and community‐managed groundwater recharge solution in the Dharta catchment of Rajasthan, India. Alongside check dams and
Prahlad Soni   +4 more
wiley   +1 more source

Narrative power in the narrative policy framework

open access: yesPolicy Studies Journal, Volume 54, Issue 3, August 2026.
Abstract The Narrative Policy Framework lacks clear and empirical explanations of power. Yet, the study of narratives is inherently the study of power in shaping policy outputs and decisions. We develop a conceptual model positing that expressions of power (power to, with, and over) may be discovered in narrative constructs (e.g., narrative structure ...
Elizabeth A. Shanahan   +8 more
wiley   +1 more source

基于10/350μs波形下不同压敏电压的限压型浪涌保护器间能量配合研究

open access: yesDianci bileiqi, 2019
浪涌保护器(Surge protective device,SPD)对于保障电气、电子设备免于雷击风险有着至关重要的作用。为实现电气、电子系统过电压保护,必须安装两级或多级合理能量配合SPD。针对SPD间能量配合问题,利用10/350μs波形对I类、II类SPD并联能量配合问题进行研究,得出以下结论:当SPD间无专门退耦装置时,限压型SPD间的线路特性阻抗对于其间能量配合起到关键作用。当第一级SPD压敏电压高于第二级,且SPD间距离短、冲击浪涌电流较小时,SPD间能量配合失效 ...
程智余, 沈淼, 邱宏瑜
doaj  

Marine Applications of Metal‐Modified FEVE Coatings on 6061 Aluminum Alloy for Enhanced Anti‐Corrosion and Anti‐Biofouling

open access: yesRare Metals, Volume 45, Issue 7, July 2026.
ABSTRACT This study developed a metal–modified fluoroethylene vinyl ether (FEVE) organic coating on 6061 aluminum alloy, supported by a micro‐arc oxidation (MAO) pretreatment layer, to enhance corrosion resistance and antifouling performance in marine environments.
Chang Liu   +5 more
wiley   +1 more source

Leaf C:P ratio as a universal indicator of photosynthesis in subtropical woody species: Stoichiometric thresholds and metabolic trade‐offs

open access: yesFunctional Ecology, Volume 40, Issue 7, Page 2332-2344, July 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometric ratios of carbon (C), nitrogen (N) and phosphorus (P) serve as important indicators for assessing nutrient balance in forest ecosystems, but their relationships with photosynthetic dynamics require deeper characterization.
Minghao Chen   +9 more
wiley   +1 more source

标准衰减振荡波下压敏电阻能量配合研究

open access: yesDianci bileiqi, 2017
为了有效利用压敏电阻对真实雷电过电压进行防护,需要对标准衰减振荡波下压敏电阻能量配合进行研究。利用EMTP软件搭建0.5μs-100 k Hz标准振荡波发生电路,采用IEEE压敏电阻模型进行仿真冲击。分析前后级压敏电阻采用高低配合与低高配合方式的防护效果。最后讨论不同前后级压敏电阻连接导线长度对分流和能量吸收的影响。分析结果表明:压敏电阻残压随着充电电压的增加而增大,低高配合方式下,前级压敏电阻承受了绝大部分雷电流和能量,配合效果不如高低配合方式。前后级连接导线长度增加时,流过前级和后级的电流峰值均降低,
苏奎, 马媛媛
doaj  

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