Gaoya dianqi, 2018 基于半桥子模块拓扑的模块化多电平电压源换流器（HBSM-MMC）和直流断路器构建的柔性直流电网能够实现大规模新能源的并网和消纳,发展前景良好。柔性直流电网技术的发展主要限制于高压直流断路器,因此对高压直流断路器开断过程以及开断能力影响因素的研究十分有必要。文中首先研究了适用于HBSM-MMC柔性直流电网的模块化混合型高压直流断路器运行原理;并在此基础上详细分析了模块化混合型直流断路器开断时间的影响因素;然后研究了直流断路器过电压的影响因素;最后在PSCAD ...
张军, 吴金龙, 王先为, 姚为正
doaj
Gaoya dianqi, 2016 根据向—上工程复、奉两站特高压直流分压器二次侧电压异常跳变多发生在阴雨、雾霾天气的特征,文中从直流分压器的工作原理、内部电阻发热、外部电场畸变等方面对故障原因进行了分析。分析结果表明由直流分压器内、外电压差过大产生的径向放电而引起的分压器高压臂阻容元件短路是导致分压器二次侧电压跳变的原因。表面上污秽和潮湿环境下,直流分压器绝缘子外表面电场强度发生了强烈的畸变是产生径向放电的直接原因;实际上现有直流分压器在结构设计上存在缺陷使得直流分压器内部发热严重 ...
汪本进 +4 more
doaj
[A dual-center study of enhanced CT-based nomograms predicts spontaneous portosystemic shunts on initial hemorrhage from rupture of esophageal gastric varices in cirrhosis]. [PDF]
Zhonghua Gan Zang Bing Za ZhiYan XZ +7 more
europepmc +1 more source
[Research advances on hepatic encephalopathy following transjugular intrahepatic portosystemic shunt]. [PDF]
Zhonghua Gan Zang Bing Za ZhiYe JJ, Pan YL, Wang J, Lyu Y.
europepmc +1 more source
[Master manipulator of vascular intervention surgical robot based on haptic feedback]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiHan G, Sun Z, Tang X.
europepmc +1 more source
[Outcomes of suture-mediated vascular closure device in the closure of left brachial artery access site after thoracic endovascular aortic repair]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanLi W, Zhang X, Li W, Zhang T, Zhang X.
europepmc +1 more source
Gaoya dianqi文中分析了现有特高压柔性直流控制保护系统设备国产化替代的迫切需求，提出了运行人员控制系统、远动装置、直流控制保护主机、三取二装置和测控装置等全国产化替代原则和设计方案，研制了直流控制保护主机、三取二装置和测控装置。搭建了基于进口芯片和全国产化芯片的特高压柔性直流控制保护系统的RTDS硬件在环实时仿真平台，试验对比了进口芯片和全国产化芯片的特高压柔性直流控制保护设备的功能和性能，试验结果表明，全国产化芯片特高压柔性直流控制保护设备的功能和性能，总体不低于、个别性能优于进口芯片特高压柔性直流控制保护设备 ...
黄雄辉 +5 more
doaj
[Effectiveness of lymphaticovenular anastomosis combined with perioperative targeted drainage in treatment of secondary lower limb lymphedema: a prospective randomized trial]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiWang X +5 more
europepmc +1 more source
[Early effectiveness and safety of mini open endoscopy assisted anterior cervical discectomy and fusion in treatment of cervical spondylotic myelopathy]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiPan X, Wang X, Wang C, Su W, Sheng J.
europepmc +1 more source
[Novel advances following the integration of Baveno VII consensus definitions for the non-invasive testing of portal hypertension]. [PDF]
Zhonghua Gan Zang Bing Za ZhiChen JL, Yang CQ.
europepmc +1 more source