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考虑谐波谐振和电压稳定的海上风电场无功优化配置方法 [PDF]
, 2023 海上风电经长距离高压交流海底电缆接入电网，海底电缆容升效应显著，容易引起工频过电压，同时电力电子器件和线路电容引起的谐波谐振问题也严重影响着电网电能质量，因此进行海上风电场无功配置时应充分考虑过电压和谐波谐振问题。针对上述问题，建立了海上风电场谐波模型，对海上风电场的谐波模态阻抗进行扫描，继而分析海上风电场的谐振特性；然后研究了海上风电场无功特性，计算各种发电出力水平和并网点电压下的风电场无功缺额；接着以降低综合成本为目标，以静态电压稳定裕度、最小补偿容量、谐波谐振及过电压为约束 ...
马明, 梅桂华, 杜婉琳*, 王玲
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, 2023 针对中国第一个海上风电柔性直流送出工程—江苏如东工程，从系统拓扑方案构建、过电压与绝缘配合、系统功率盈余问题与交流故障穿越技术以及控制保护技术等方面开展了深入研究，构建了轻型紧凑化的海上风电柔性直流系统拓扑方案，取消了海上换流站的启动回路与接地回路等；提出了海陆换流站的避雷器配置方案与参考电压的选取原则，形成了海陆换流站的绝缘配合方案的典型范式；提出了集中式、分布式、混合式直流侧有功功率动态平衡装置的典型拓扑方式，解决了陆上换流站交流侧故障穿越难题；提出了工程的整体控制保护方案 ...
卢亚军 +6 more
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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
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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
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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
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, 2023 为提升远海风电对称双极柔性直流送端交流系统单相接地故障和两相短路故障工况（第一类故障）下的功率输送能力，以及三相接地故障工况（第二类故障）的交流电压稳定性，提出海上换流站协调控制策略。首先分析了第一类故障的过电压和极间环流产生机理，以及第二类故障的交流电压失稳机理。在此基础上，提出了功率平衡控制策略和输出有功电流策略。第一类故障下定电压控制极采用限压策略，功率平衡控制策略抑制极间环流，增大定电压控制极的功率，减少了交流电压控制器响应时间，提升了功率输送能力。第二类故障工况下 ...
黄海 +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
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A stochastic model for estimating sustainable limits to wildlife mortality in a changing world
Conservation Biology, Volume 36, Issue 4, August 2022., 2022 Abstract Human‐caused mortality of wildlife is a pervasive threat to biodiversity. Assessing the population‐level impact of fisheries bycatch and other human‐caused mortality of wildlife has typically relied upon deterministic methods. However, population declines are often accelerated by stochastic factors that are not accounted for in such ...
Oliver Manlik +5 more
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Computational Intelligence and Neuroscience, Volume 2022, Issue 1, 2022., 2022 An important sign of the accessibility of Braille information is the realization of the mutual translation between Chinese and the Braille. Due to the irregularity and uncertainty of the Prevailing Mandarin Braille, coupled with the lack of a large‐scale Braille corpus, the quality of Chinese‐Braille translation seems to be poor.
Ju-Xiao Zhang +6 more
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Gaoya dianqi, 2022 近年来,利用海上漂浮式风电平台开发风电资源逐渐成为能源开发的重要发展方向之一。动态海缆作为风机与静态海底电缆间的连接装置,是海上能源输送系统的关键设备。在动态海缆运行过程中,其往往面临着电—热—机械等多种失效因素,这对动态海缆的关键材料尤其是绝缘材料的性能提出了更高的要求。文中针对一种超纯净均聚抗水树交联聚乙烯材料进行研究,结合动态海缆可能面临的失效风险因素,对绝缘材料的机械性能、电气性能及耐温性能进行测试,验证材料作为动态海缆绝缘材料的适用性。
康佳 +5 more
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