Results 1 to 10 of about 14,295 (168)
Dianci bileiqi, 2021 针对垂直于盛行风向上的风电机组,基于风机缩比模型,开展静止叶片的正负极性雷击单风机、双风机系统模拟试验研究。通过试验获取单风机不同叶片角度下气隙100%击穿电压,以及不同叶片角度、不同风机间距下的雷击风机次数、概率。分析数据及结果,归纳不同叶片角度下的风机防雷间距,并给出大型风电场风机防雷间距布置的相关建议。试验研究表明,正极性雷电下风机更易遭受雷击;风机间距增大,双风机间的屏蔽作用减弱,雷击风机次数、概率上升;屏蔽作用较强时对应的叶片角度为0°与60°;叶片角度为0°、30°、60°时 ...
蔡国伟, 雷宇航, 潘超
doaj
Dianci bileiqi, 2021 风力发电机遭受雷击时,塔筒内控制电缆、塔基处以及箱式变压器低/高压侧都会出现过电压,且过电压还会通过集电电缆和联合接地装置传到其他风电机组。为研究雷击风电场时引起的暂态电压,建立了包含风力发电机、集电电缆、箱式变压器的等效模型。考虑了雷电流参数、风力发电机接地电阻大小及风电场拓扑结构对风电场过电压影响。结果表明:单台风电机组遭受雷击的情况下,风电机组过电压值与雷电流幅值成正比,且波前时间为8.0μs和20.0μs时,雷电流幅值对控制电缆缆芯过电压影响很小;风电机组过电压值与波前时间成反比 ...
罗永志 +5 more
doaj
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
Gaoya dianqi, 2022 随着风力发电的供需日益增长，风力发电机越来越多地被安装在具有高土壤电阻率和高雷击发生率的次优地理位置，这使得风力发电机的防雷系统成为风电场设计的关键因素。有效的防雷系统不仅保证了风力发电机物理结构和运行控制人员的安全，还可保护风力发电机内部的电气控制系统，以实现风能的高效消纳。基于此，文中提出了一种适用于风电场的防雷系统有效性评估新方法，在风电场早期规划阶段采用所提评估方法，可减少雷击引起的WT停机时间，从而提高风机的发电量。考虑到接地系统在风电场防雷系统中起着至关重要的作用 ...
杨俊 +5 more
doaj
Climatic Long Term Trend and Prediction of the Wind Energy Resource in the Gwadar Port [PDF]
, 2017 利用欧洲中期天气预报中心的ERA-Interim海表10m风场资料，计算巴基斯坦瓜达尔港的风能资源近36年(1979—2014年)期间的历史变化趋势，并利用线性回归和BP神经网络两种方法，对该港的风能资源进行长期年度预测，得到以下结果。1)瓜达尔港夏季的风能资源比冬季丰富，且夏季的稳定性明显好于冬季。2)近36年期间，风能密度、有效风速频率和100W/m2以上能级频率分别以?0.78W/(m2·a)，?0.21%/a和?0.22%/a的速度逐年显著递减，且该趋势主要体现在夏季，冬季无显著变化趋势 ...
郑崇伟, 陈璇, 高悦
core +1 more source
Current Status and Prospect of Recycling Technology of Wind Turbine Blades [PDF]
, 2023 [Introduction] The growth of wind power industry is accelerating faster than ever worldwide, at the same time, the waste generation from end-of-life wind turbine blades is expected to peak in recent years.
Biqiong DONG +5 more
core +1 more source
Effect of axial spacing on rotating stall performance of FBCDZ-10-No20 contra-rotating fan [PDF]
, 2023 Mining contra-rotating fan are prone to rotational stall when it operates at low flow rates, which seriously affects the operational stability. The unsteady flow in the full flow passage of a FBCDZ-10-No20 contra-rotating fan at five axial spacings was ...
Qingguang CHEN +3 more
core +1 more source
Fault Diagnosis Method of Wind Turbines Based on Wide Deep Convolutional Neural Network With Resampling and Principal Component Analysis [PDF]
, 2023 Fault diagnosis of wind turbines suffers from less training data and noises. A method based on wide deep convolutional neural network with resampling and principal component analysis was presented for the diagnosis of mechanical faults (that is the main ...
BAO Yanyang, LI Dazi, LIU Zhan
core +1 more source
Secondary frequency control of islanded microgrid considering wind and solar stochastics
, 2023 As the high penetration of wind and photovoltaic distributed generation (DG) in the microgrid, the stochastic and low inertia emerge, bringing more challenges especially when the microgrid operates in isolated islands.
Chen, Jikai +4 more
core +1 more source
Experimental Research on the Dynamic Characteristics of Offshore Wind Turbine Model Under the Action of Highly Nonlinear Waves [PDF]
, 2023 [Introduction] Monopile foundation is currently the most widely used support structure for offshore wind farms. For offshore wind farms in the medium water depth area such as Dafeng, Binhai and Sheyang in China, the design waves are very close to the ...
Lixian ZHANG +6 more
core +1 more source