Results 11 to 20 of about 8,141 (130)
Jianzhu Gangjiegou Jinzhan, 2021 单层双向正交索网结构是由两个方向的正交拉索组合而成的索网体系,其成型过程与约束形式、成型方法等密切相关,需要通过大量仿真计算分析来确定成型方法。国家速滑馆屋盖是由单层双向正交马鞍形索网、环桁架及幕墙索组成的组合结构体系,结构跨度为124 m×198 m,是目前世界上最大跨度的单层双向正交索网结构。为了制定行之有效的施工方案,采用有限元软件MIDAS/Gen,对该索网结构的施工过程进行了详细的仿真计算分析,对多种成型方法进行了比选,并对不同的支座约束形式进行了计算分析,最终确定了"地面组装索网 ...
王泽强 +5 more
doaj
Grid-connected control strategy of GFM inverter in solar-powered ship photovoltaic system [PDF]
Objective The paper aims to solve the problem of the overall stability of the ship's power system being reduced due to the use of grid-following (GFL) control for grid connection in existing solar ship photovoltaic (PV) power generation systems ...
Chunhua ZHAO +2 more
core +1 more source
Gaoya dianqi, 2023 虚拟同步发电机（virtual synchronous generator,VSG）型构网储能因其良好的阻尼与惯量支撑特性已被广泛关注，但VSG型构网储能难以抑制有功暂态存在的超调、振荡的同时削减有功稳态偏差，灵活性差。首先建立VSG型构网储能系统有功环的闭环小信号模型，由系统的特征方程、波特图以及根轨迹分析有功指令与电网频率扰动下的系统暂态与稳态特性。接着指出固定参数VSG型构网储能无法兼顾暂态存在的超调、振荡与稳态有功偏差。因此提出一种自适应VSG型构网储能控制策略 ...
赵炳洋, 赵波, 胡娟, 张芳
doaj
An analysis method for the maturity of power technology based on literature search [PDF]
China’s power industry has gone through a period of rapid development. With the transformation of the global energy structure, the development goal of building a new type of power system was proposed, which pointed out the direction for the next stage of
HE Dongshan +5 more
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Dynamic Power Decoupling Control of Virtual Synchronous Generator Based on Improved Virtual Impedance [PDF]
ObjectivesWhen a virtual synchronous generator (VSG) is connected to a medium and low voltage distribution network, the line impedance exhibits resistive and inductive characteristics, resulting in strong coupling in the VSG output power.
REN Mingwei +4 more
core +1 more source
Shuitu Baochi Xuebao, 2021 以长三角3省1市为研究区，旨在构建长三角地区土壤水分长时间序列，为农业生产和遥感算法提供数据支撑。研究基于空间匹配的站点土壤水分数据和气象数据，利用主成分分析得到4个有效主成分作为线性回归和BP神经网络模型的输入因子，建立土壤水分与气象因子间的定量关系，并评估所构建模型的精度。结果表明，基于全部站点数据建立的单一BP神经网络模型优于单一线性回归模型。单一线性回归模型的R2=0.34，RMSE=0.046 m3/m3，MAE=3.67%；而单一BP神经网络模型的训练、验证和测试3个数据集的R2均在0 ...
李柳阳 +4 more
doaj
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Plant phenology is crucial for understanding plant growth and climate feedback. It affects canopy structure, surface albedo, and carbon and water fluxes. While the influence of environmental factors on phenology is well‐documented, the role of plant intrinsic factors ...
Yunpeng Luo +8 more
wiley +1 more source
Developing New Quality Productive Forces to Achieve Carbon Neutrality [PDF]
ObjectivesIn response to global climate change, China has committed to achieving carbon neutrality by 2060, which will inevitably bring strategic transformations across various industries and present an opportunity to develop new quality productive ...
HU Shanying, JIN Yong, ZHANG Zhenye
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Defining and identifying relevant stakeholders to advance effective conservation
Conservation Biology, EarlyView.The challenge of defining stakeholders in environmental science and an approach for refining existing definitions. Abstract Stakeholder is a contested term that has spawned a multitude of ad hoc definitions. The ambiguity of these definitions has oftentimes impeded transdisciplinary research in environmental governance and conservation science because ...
Milan Büscher +5 more
wiley +1 more source
Research on Deep Peak Shaving Performance of 1 000 MW Ultra-Supercritical Coal-Fired Boiler [PDF]
ObjectivesDeep peak regulation of coal-fired boilers is crucial to the stability of the future power system dominated by new energy, but there is a lack of performance and engineering applications on deep peak regulation of 1 000 MW ultra-supercritical ...
DING Yong
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