Results 31 to 40 of about 15,036 (258)
Latin American Attachment studies: A narrative review
Infant Mental Health Journal: Infancy and Early Childhood, Volume 43, Issue 4, Page 653-676, July 2022., 2022 Abstract Attachment theory´s core hypotheses (universality, normativity, sensitivity, and competence) are assumed to be applicable worldwide. However, the majority of studies on attachment theory have been conducted in Western countries, and the extent to which these core hypotheses are supported by research conducted in Latin America has never been ...
Katherine Fourment +3 more
wiley +1 more source
多端VSC-HVDC风电送出系统的低电压穿越综合策略设计 [PDF]
全球能源互联网, 2019 基于含风电接入的VSC-HVDC输电系统网侧换流站的基本结构，提出了接入交流电网发生三相短路时风电送出系统的低电压穿越综合控制策略。通过切换网侧换流站控制策略，并与chopper电路配合，实现网侧故障换流站向交流电网提供无功支撑，同时网侧非故障换流站和直流chopper电路协同泄放系统冗余功率，而风电场侧换流站始终维持风电场侧电压稳定。仿真分析表明，该策略可以保障系统送电端的风电场在故障期间正常运行并维持直流母线电压的稳定。在电压跌落幅度较小时可维持系统的有功输出以及无功支撑 ...
姜山 +5 more
doaj +1 more source
Evident but context‐dependent mortality of fish passing hydroelectric turbines
Conservation Biology, Volume 36, Issue 3, June 2022., 2022 Abstract Globally, policies aiming for conservation of species, free‐flowing rivers, and promotion of hydroelectricity as renewable energy and as a means to decarbonize energy systems generate trade‐offs between protecting freshwater fauna and development of hydropower. Hydroelectric turbines put fish at risk of severe injury during passage. Therefore,
Johannes Radinger +2 more
wiley +1 more source
全球能源互联网, 2023 随着风、光新能源装机占比逐渐提高，电力系统灵活性需求不断增加，对水电发挥灵活调节能力提出了更高要求，仅在电站或流域层面开展水风光协同开发难以充分发挥水电灵活性价值，无法满足系统调节需求。因此，需要从系统层面出发，开展跨流域水风光协同开发研究，通过扩大水风光互补范围，最大程度发挥水电调节能力作用。通过构建跨流域水风光协同规划模型，量化分析西南地区八大流域干流水电可支撑新能源开发消纳的潜力。结果表明，与流域级水风光协同开发相比，西南地区跨流域水风光协同开发可大幅提升新能源装机规模及消纳电量 ...
刘泽洪 +5 more
doaj +1 more source
Journal of Diabetes, Volume 14, Issue 5, Page 315-333, May 2022., 2022 Highlights This consensus document identifies challenging areas and strategic recommendations for the effective management of cardiorenal complications in type 2 diabetes mellitus in the Middle East and North Africa and Africa. There is a need for optimum glycemic control, early identification of cardiorenal complications, along with risk management ...
Alper Sonmez +12 more
wiley +1 more source
全球能源互联网, 2019 海上风电投资成本高、风险大，为提高其经济性，海上风电机组向超大容量化快速发展。全功率变换风电机组成为海上机组的主流，该机组要求变流器的容量与机组容量相匹配，同时对其运行效率、可靠性和可用度提出了更高的要求。采用两电平或三电平变换器并联组成的变流器是海上风电变流器的主流结构，对并联变流系统的优化运行、容错和重构控制可有效提升其效率和可用度，对风电变流器控制的改进也可以使机组主动参与电网频率响应。针对海上风电变流器运行效率和可用度提升技术、风电高比例并网和平价上网的技术需求，综合评述其研究现状和技术趋势。
蔡旭 +6 more
doaj +1 more source
全球能源互联网, 2019 准确评估风电场发电量水平对项目开发至关重要。针对海岸线附近的近海风电场，结合已建项目的测风塔数据和风电机组运行资料，得出WAsP计算模型主要参数取值。近海地区的风资源及发电量呈现一定的衰减规律，通过不同粗糙度和尾流衰减系数的设置，验证各方案模型电量与实际电量的拟合水平。结果表明，风电场的粗糙度取值要结合地形地貌、海洋水文条件等因素，海岸线附近近海风电场的粗糙度取值略高于软件推荐值，粗糙度水平为0～0.005 m；Park模型尾流衰减系数越小，发电量越小，不同的尾流衰减系数对发电量计算结果影响高达4.9%，
王尼娜 +5 more
doaj +1 more source
基于预测控制的储能系统多时间尺度动态响应优化研究 [PDF]
全球能源互联网, 2020 风电固有的随机性使其难以在长时间尺度上被准确预测，且预测误差随预测时间的延长而增大，导致用于抑制风电随机性的储能控制策略往往与实际需求偏差较大。为了有效应对风电的动态随机性，应用由不同响应能力及容量的储能单元组成的混合储能系统，提出一种基于多时间级分层思想与模型预测控制（model predictive control,MPC）理论相结合的混合储能分层MPC优化策略，实现对风电和储能的精准控制。在对风电进行周期预测的基础上构建储能分层动态响应优化模型 ...
吴传申 +4 more
doaj +1 more source
Journal of Traumatic Stress, Volume 35, Issue 2, Page 581-592, April 2022., 2022 Abstract Pakistan is considered to be relatively unsafe for journalists; however, little is known about how working in situations that involve a high risk of trauma exposure and personal threat impacts journalists’ mental health. The present study aimed to examine the associations among reporting on topics that carry a high risk of trauma exposure ...
Suzanna M. Koster +3 more
wiley +1 more source
应用于海上风电接入的VSC-HVDC系统主网侧交流故障穿越方案 [PDF]
全球能源互联网, 2019 海上风电是可再生能源的重要形式和组成部分，通过基于电压源换流器的高压直流输电（VSC-HVDC）技术进行风电的远距离接入，使远离海岸的区域建设风电场成为可能，另外该技术也具备更大规模风场的接入能力。目前世界范围已有多个应用VSC-HVDC输电系统将海上风电场接入到陆上主电网的工程规划。然而，大规模风电会对系统的稳定性带来诸多挑战，尤其需要确保在故障工况下风电场及主电网的稳定性，VSC-HVDC以其优良的灵活性成为应对此类挑战的不二选择。本文对不同风电接入方式下系统的故障穿越方案进行了总结，对VSC ...
王国英 +3 more
doaj +1 more source