Results 31 to 40 of about 12,416 (162)

Wireless Autonomous Power Flow Control in Converter-Fed Microgrids [PDF]

open access: yes, 2014
When total apparent power of the energy storage system (ESS) interfacing converter is fixed, the higher the requirement on reactive power in the microgrid system with distributed multiple converters, the weaker the ability of ESS to balance theactive ...
Guerrero, Josep M.   +4 more
core   +2 more sources

Literature Analysis of Energy Storage Research Based on Object Hierarchy [PDF]

open access: yes, 2023
[Introduction] With the development of energy storage technology, technical schemes and application scenarios become more and more complex. For energy storage research, the conventional classification method based on technical route has certain ...
Chengye MEI   +4 more
core   +1 more source

考虑调峰特性的抽水蓄能电站综合效能量化评估 [PDF]

open access: yes全球能源互联网
在当前“双碳”目标的背景下,中国大力提倡能源转型,可再生能源发展迅速,其反调峰增大了系统的调峰压力。抽水蓄能电站作为重要调峰资源,是解决上述问题的有效手段之一,综合量化评估其在大规模风光并网下的效能,是对抽蓄电站的建设投资、运营设计和经济优化等工作提供科学决策的前提。为此,首先分析实际系统运行中抽蓄电站效能发挥的典型场景,并根据抽蓄电站的特性从不同维度建立了电站效能评价指标。然后采用模糊综合评价法构建了一套综合效能量化评估体系,运用改进层次分析法-CRITIC法的综合赋权法对各层指标赋权 ...
李军徽   +7 more
doaj   +1 more source

计及分布式电源的城市重要用户应急电源优化配置 [PDF]

open access: yes全球能源互联网, 2018
在城市高可靠性供电方式下,城市重要用户专门配置的应急电源利用率低下,资源浪费严重。随着未来电网的发展,分布式电源在城市日趋普及,将其兼做应急电源是解决传统应急电源闲置问题、进一步发挥分布式电源作用的有益尝试。提出了一种计及分布式电源的城市重要用户应急电源优化配置方法,以城市分布式电源的类型与特点确定其应急工作方式,利用多人决策AHP方法量化用户重要性,然后基于区域电网结构,以等效重要负荷最大为最优目标,以有功功率平衡为约束,通过遗传算法求解来划分应急孤岛 ...
刘飞, 汤亮亮, 邓鹤鸣, 伍俊
doaj   +1 more source

Design and Implementation of State Estimation and Management for a Power Enterprise [PDF]

open access: yes, 2015
电力系统运行的安全性和可靠性直接关系到国家经济的发展,同时也是维系国家安全和社会稳定的重要因素,因此电力一直是国家的支柱能源和经济命脉。目前电力系统运行的各种约束条件日益强化,其运行方式和网架结构也越来越复杂,这是因为电力行业向大系统、超高压、远距离、大容量方向发展。为了给调度工作人员提供相关技术支持,通常采用电网能量管理系统(EMS)来集成各种数据。EMS能够为电网的安全运行奠定良好的基础。作为EMS的不可或缺的重要部分之一,状态估计能够为系统提供可靠完整的信息和系统状态数据 ...
莫明江.阿不力克木
core  

Engineering 2D Materials for High‐Current‐Density Electrocatalytic Water Splitting

open access: yesRare Metals, EarlyView.
ABSTRACT Water electrolysis is a key method for sustainable hydrogen production, using water as an abundant resource. However, efficient and stable operation at high current densities remains challenging due to energy losses, catalyst degradation, and limited ion–electron transport.
Tianqi Guan   +8 more
wiley   +1 more source

Smart Biomaterials and Dressings for the Treatment of Chronic Inflammatory Skin Diseases

open access: yesRare Metals, EarlyView.
ABSTRACT Chronic inflammatory skin diseases, encompassing immune‐inflammatory conditions and infection‐associated dermatoses, pose significant clinical challenges due to high prevalence, recurrence, and therapeutic resistance, affect over 30% of the global population.
Zehao Lan   +5 more
wiley   +1 more source

Business Process Optimization for Relay Protection of State Grid Ningde Company [PDF]

open access: yes, 2016
电力行业是一个对社会经济影响极大,技术经济特征十分复杂的自然垄断产业。国家电网公司正面临电网规模不断扩大、智能电网技术快速发展、三集五大即人力、物力、财力集约化管理,大规划、大建设、大运行、大检修、大生产体系建设的体制改革等现状,而传统的管理方式已无法匹配国网公司的发展。本文以此为研究背景,以宁德供电公司为例,具体研究了大二次专业业务流程优化的相关问题。 首先,本文在对流程管理和流程优化理论进行认真分析的基础上,运用ECRSI分析法、标杆管理等相关理论,分析了宁德供电公司大二次专业业务流程现状 ...
郭茜婷
core  

Gravity‐Driven Inclination Sensor Based on Liquid Metal Interface Migration in Anisotropic Microchannels for Information Transmission and Continuous Surface Topography Scanning

open access: yesRare Metals, EarlyView.
ABSTRACT With the continuous advancement of materials science and technology, the rare metal gallium has increasingly emerged as a promising alternative to the toxic metal mercury. Although existing research has predominantly focused on the high electrical conductivity and excellent deformability of liquid metal (LM), its intrinsic fluidic property ...
Feifan Guo   +6 more
wiley   +1 more source

高比例风电系统宽频振荡紧急控制策略研究 [PDF]

open access: yes全球能源互联网
宽频振荡紧急控制是保障风电系统安全运行的“兜底”措施之一。由于风电系统非线性强度大及运行工况多变,难以建立宽频振荡在线风险评估的解析模型。为此,提出了基于数据驱动的宽频振荡风险在线评估方法及紧急控制策略。首先,设计了能够应对宽频振荡多模态和时变特征的宽频相量检测算法,为后续宽频振荡特征评估提供数据支撑;其次,利用最大李雅普诺夫指数作为宽频振荡动态演化趋势的量化指标,并根据风电机组模态阻抗的负电阻效应在线辨识宽频振荡源;然后,融合宽频振荡特征辨识结果,提出宽频振荡风险在线评估策略 ...
柳劲松, 马宁宁, 刘舒
doaj   +1 more source

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