Gaoya dianqi, 2019 针对哈密地区大规模风电场在无串补情况下发生的次同步振荡现象。文中在PSCAD/EMTDC软件上搭建了多机直驱风电场无串补输电系统模型,结合特征值分析法研究了风速、网侧控制器参数、风电汇集点短路比和火电机组出力对次同步振荡特性的影响,并进行仿真验证。结果表明:无串补情况下,风电场在各风段均有可能发生次同步振荡,风速小,振荡频率高,风速大,振荡频率低。网侧控制器比例增益越大,振荡频率越小,积分增益越大,振荡频率越大。短路比越小,系统发生次同步振荡的可能性越大。低功率运行时,火电机组出力在50%～80%范围内,
邓王博 +3 more
doaj
[Extracellular matrix materials and tissue regeneration and repair]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiZhao L, Xie H.
europepmc +1 more source
Dianci bileiqi风机附近的防雷问题是风电场防雷的重点，影响到风电资源能否安全有效送出。目前采用在集电塔后一基杆塔三相安装多间隙避雷器可以与氧化锌避雷器配合，减少由于避雷器故障而造成的系统故障，但是多间隙避雷器在动作时产生的截波沿线路传入风机箱变，可能会威胁到变压器绕组的绝缘。基于上述问题，本研究在ATP-EMTP上搭建了多间隙避雷器截波特性对风机箱变绕组的绝缘影响分析仿真模型，考虑了多间隙避雷器的常规安装方式和极限安装方式，分别计算了两种情况下多间隙避雷器在受雷击后产生的截波过电压对风机箱变绝缘产生的影响。通过仿真分析，
潘才维 +7 more
doaj
[Diabetic Charcot neuroarthropathy initially misdiagnosed as rheumatoid arthritis and gout: A case report]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanGu J, Li X, Zhao J, Mu R.
europepmc +1 more source
[Performance evaluation of different filtration fractions during daytime continuous renal replacement therapy]. [PDF]
Zhejiang Da Xue Xue Bao Yi Xue BanWang L, Chen Y, Xu G, Xu C.
europepmc +1 more source
[The experimental study of <sup>18</sup>F-NaF micro PET/CT imaging in a mouse-model of acute gouty arthritis]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiYou Z +7 more
europepmc +1 more source
[Preoperative serum magnesium as a biomarker for predicting delirium following non-cardiac surgery in elderly patients: a retrospective cohort study]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoYuan M +10 more
europepmc +1 more source
[Intubaiton with electromyographic endotracheal tube increases risks of postoperative sore throat following thyroidectomy under general anesthesia: a retrospective cohort study]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoChen L +5 more
europepmc +1 more source