Results 11 to 20 of about 4,165 (161)
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
基于3D扫描雷达实测数据的海上风电场尾流特性研究 [PDF]
全球能源互联网, 2023 为有效优化实际业务中海上风电场的机组排布方案设计，降低尾流电量损失，在江苏某海上实际运行风电场采用3D扫描雷达进行实地尾流观测实验，分析独立尾流、半尾流和全尾流三种工况下机组的尾流长度、尾流宽度及尾流深度等尾流特性。研究表明，独立尾流工况下机组尾流下游方向11D～12D（D为叶轮直径）距离处风速变化趋平，尾流影响减弱，机组尾流影响长度在11D左右；近尾流区内，全尾流工况机组的风速衰减较独立尾流和半尾流工况机组明显增大，远尾流区三种工况变化趋势一致，尾流宽度均在3D左右，呈“双高斯”或“凹型”分布特征 ...
刘树洁 +4 more
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Brief Analysis of the Development of Mechanical Research and Trends of Grouted Connection of Offshore Wind Turbine [PDF]
, 2023 [Introduction] The connection between offshore wind turbine foundation and superstructure is usually made by grouting. It is crucial to ensure the safety of the grouted connections, and the study of grouted connections is always a key and difficult point.
Kan LIAO, Ke CHEN, Li ZHANG
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Optimization Analysis of Permanent-Magnet Direct-Drive Wind Turbine Elbow Shape Nacelle [PDF]
, 2023 [Introduction] In view of the irregular geometric shape, complex load and heavy weight of the nacelle of a permanent magnet direct drive wind turbine, it is necessary to optimize the analysis and design.
Fangshu CHEN, Feng SHI, Xuebing YANG
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Identifying socioeconomic and biophysical factors driving forest loss in protected areas
Conservation Biology, Volume 37, Issue 4, August 2023., 2023 Abstract Protected areas (PAs) are a commonly used strategy to confront forest conversion and biodiversity loss. Although determining drivers of forest loss is central to conservation success, understanding of them is limited by conventional modeling assumptions.
Kathryn A. Powlen +3 more
wiley +1 more source
全球能源互联网, 2021 相比于柔性直流输电（VSC-HVDC）送出方案，送端采用不控整流器（diode rectifier，DR）的DR-HVDC方案具有损耗低、体积小和成本低的优点，是未来海上风电送出技术的重要发展方向之一。为了解决黑启动和海上交流电压调控问题，现有的DR-HVDC拓扑主要采用海上平台装设储能、系统增加交流联络线路、送端换流站并联VSC三种方案。以深远海海上风电送出为背景，对上述三种DR-HVDC拓扑方案进行了经济性分析，并与VSC-HVDC方案进行比较。采用了全寿命周期成本分析（life cycle ...
李贤育 +6 more
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Journal of Diabetes, Volume 15, Issue 1, Page 27-35, January 2023., 2023 Highlights This study constructed the first 5‐year all‐cause mortality risk prediction model for patients with type 2 diabetes mellitus in south China. This well‐performing model, using highly accessible predictors collected in routine clinical settings, provides a powerful tool for clinicians to identify high‐risk diabetic patients.
Jiying Qi +10 more
wiley +1 more source
Conservation Biology, Volume 36, Issue 6, December 2022., 2022 Abstract Development and implementation of effective protected area management to reduce deforestation depend in part on identifying factors contributing to forest loss and areas at risk of conversion, but standard land‐use‐change modeling may not fully capture contextual factors that are not easily quantified.
Katherine Siegel +5 more
wiley +1 more source
Experimental Research on Scour Protection Range and Protection Effect of Large Diameter Monopile Foundation [PDF]
, 2023 [Introduction] Under the wave-current combinations during the service period of offshore wind turbine, local scour inevitably occurs around pile foundation, which threatens the overall stability and safety of offshore wind turbine. [Method] In this paper,
Dezong ZHOU +4 more
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Extinction risk of the endemic vascular flora of Kauai, Hawaii, based on IUCN assessments
Conservation Biology, Volume 36, Issue 4, August 2022., 2022 Abstract The International Union for Conservation of Nature's Red List of Threatened Species (IUCN Red List) is the world's most comprehensive information source on the global conservation status of species. Governmental agencies and conservation organizations increasingly rely on IUCN Red List assessments to develop conservation policies and ...
Nina Rønsted +15 more
wiley +1 more source