Results 51 to 60 of about 4,165 (161)
Dianci bileiqi, 2015 在能源危机的背景下,海上风电已经成为新能源研究的热点,我国海上风电的发展才刚刚起步。海上风力发电机组接地网结构、所处环境等和陆上风力发电机组均有显著差异,为了研究海上风电机组组的接地问题,利用CDEGS软件建立了利用导管架基础作为海上风电机组组自然接地体的仿真模型。首先将模型的每一个导体进行分段,再通过复镜像法求解每一段导体的格林函数,最后通过叠加定理求解出模型的接地阻抗。此外,还计算比较了海水的水深,海水的电阻率和海床的电阻率等因素对于接地阻抗大小的影响程度,表明,利用导管架结构作为自然接地体 ...
李炬添 +6 more
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采用二极管整流单元和模块化多电平换流器的混合型远海风电送出方案
Gaoya dianqi, 2023 目前基于模块化多电平换流器（modular multilevel converter,MMC）的柔性直流输电系统是远海风电并网的典型方案，而整流站采用二极管不控整流单元（diode rectifier unit,DRU）可以进一步提升直流输电系统的经济性和可靠性。基于DRU的海上风电并网方案能否实施的关键在于海上交流系统电压的幅值和频率能否得到有效控制。为此，提出在整流侧采用DRU和MMC并联的混合型远海风电送出方案。首先，阐明了混合型远海风电送出系统的拓扑结构和运行特性 ...
彭开军 +5 more
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Conservation Biology, Volume 38, Issue 3, June 2024.Abstract Protected and conserved areas (PCAs) are key ecosystem management tools for conserving biodiversity and sustaining ecosystem services and social cobenefits. As countries adopt a 30% target for protection of land and sea under the Global Biodiversity Framework of the United Nations Convention on Biological Diversity, a critical question ...
David A. Keith +14 more
wiley +1 more source
A review of platform designs for floating offshore wind turbines [PDF]
The vigorous development of wind power generation technology is the core path for the country to promote the low-carbon energy transformation and realize the "dual-carbon" (carbon peaking and carbon neutrality) goals.
Jianhua ZHANG +3 more
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Change in cyclone disaster vulnerability and response in coastal Bangladesh
Disasters, Volume 48, Issue 2, April 2024.The number of deaths owing to tropical cyclones in Bangladesh has significantly reduced. Category 4 Cyclone Gorky in 1991 and Sidr in 2007 caused 147,000 and 4,500 deaths respectively, whereas Category 1 Cyclone Mora in 2017 resulted in six. Face‐to‐face interviews with 362 residents, participant observation, and focus‐group discussions answer a ...
Edris Alam +4 more
wiley +1 more source
Gaoya dianqi, 2021 作为大型海上风电场的关键构成设施,海上交流升压站是海上风电场电力送出的枢纽,它的设计优化对于整个风场建设和运行的经济性、可靠性、可利用性、可维护性和安全性等都起着非常重要的作用。国内首个海上交流升压站在2015年于中广核如东风场投入运行[1],与成熟的陆上变电站系统相比,国内海上升压站无论是在设计还是运行方面都处于起步阶段,同时相关的设计标准和技术规范还不够完善,因此在恶劣的海洋环境工况下,对变电站用的电力变压器和GIS的技术设计要求和选用就变得尤为关键。基于丰富的欧洲海上升压站交付经验 ...
李德军, 周剑, 钟孝泰, 沈威
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Dianci bileiqi, 2020 为了预防和减少海上风电的雷害,对由雷击引发的风机机舱暂态过电压进行计算和评估非常必要,前提是建立可靠的风机雷电泄流通道模型。接地电阻的准确性是影响雷击通道模型可靠性的重要因素。考虑到我国海上风机场分布广,海况差别大的特点,将潮间带接地环境分为3层:海水层、淤泥层和砂石层,分析各层的物理深度和电阻率等因素对接地电阻的影响。以江苏如东洋口港潮间带风电场上海电气2 MW风机为例,将雷电通道划分为激励源、桨叶、机舱轴承、塔筒、接地电阻5个部分,分别进行数学建模。其中:塔筒等效成垂直中空分段圆柱体 ...
夏能弘, 陆衡, 陆嘉骁
doaj
Overview of Current Situation and Trend of Offshore Wind Power Development in China [PDF]
Under the carbon peak goal and carbon neutral vision, offshore wind power has made great progress in China in recent years. The current development status and future planning of offshore wind power in China were analyzed, summarizing the installed ...
MA Kuichao +5 more
core +1 more source
Gaoya dianqi, 2022 随着海上风电大容量机组规模化发展，集电系统电气接线将变得复杂，选择合适的集电系统电压可有效减小集电系统有功损耗，降低建设成本，提高系统可靠性。文中研究了多种模式风电场集电系统结构形式，对比分析35 kV与66 kV集电方案技术特点，计算比较4种机型两种电压集电方案成本，并对集电方案成本进行灵敏度分析，评估集电系统电气接线可靠性。结果显示66 kV集电方案技术性较好，对大容量机组大规模风电场具有较好的适用性，但总体成本高于35 kV方案。35 kV集电方案是目前海上风电场集电系统主要形式，在66 ...
王辉, 付凌云, 孙世民, 秦琼
doaj
Structural load inversion and state analysis of floating wind turbine tower based on joint input-state estimation [PDF]
ObjectiveThis study uses the structural load inversion method to conduct a dynamic response state analysis of a floating wind turbine tower under wave action.
Chao WANG +4 more
core +1 more source