Results 1 to 10 of about 522 (89)
工程技术研究, 2020 随着国家经济不断的增长，特别是东部沿海城市，对于电能的需求日益增大，加之中国能源与需求逆向分布，因此，远距离、大容量、特高压、交直流混联成为中国电网的一大特点。直流输电以其输送容量大、线路损耗小、稳定性好、快速灵活控制等特点已然成为一种极其重要的输电方式。而换流阀就是直流输电过程中的一大核心设备，但换流阀在使用的过程当中会出现局部放电的现象，而这一现象就会导致换流阀设备故障，引起直流闭锁，影响直流输送。因此要对它局部放电产生的原因进行分析并且提出一些处理的措施。
加 赵
core +2 more sources
电力工程技术创新, 2020 柔性直流输电技术是中国乃至世界构建起能源互联网框架并且促进清洁能源并网的重要技术，目前已经发展到了支撑结构，需要考虑到串联支撑绝缘子中各层绝缘子承受较大电压的问题，论文通过对串联支撑绝缘子的电压分配进行分析计算，找到了提高工程效率的方法。
丰 王
core +2 more sources
New Generation High-Performance VSC-HVDC Back-to-Back Technology and Application in Project [PDF]
, 2023 [Introduction] Due to the dense load, complex grid structure, and close electrical connections in the Guangdong power grid area, there are three major problems for a long time: the risk of large-scale power outages, the interaction between AC and DC, and
Bo ZHU +5 more
core +1 more source
Research on Flexible HVDC Transmission Technology and Strategies for Improving the Operational Stability of IGBT Components [PDF]
, 2023 [Introduction] With the continuous improvement of the strategic position of clean energy, more and more new energy power generation equipment is connected to the power grid, but its power quality is unstable, which has a great impact on the AC ...
Tao WANG +3 more
core +1 more source
Analysis of Current Situation and Future Development of Offshore Wind Power Industry [PDF]
, 2023 [Introduction] Under the trend of accelerating the clean transformation of coastal energy and adjusting the industrial structure, offshore wind power will become an important support for the safe, clean and efficient transformation of power energy in ...
Jiachang LIU +3 more
core +1 more source
, 2023 张北可再生能源柔性直流电网工程投运以来，交直流系统中数次出现次、超同步振荡问题。对2022年某日振荡发生时现场录波采集到的交直流振荡波形数据进行分析，录波数据分析表明，交流侧的次同步（43.75 Hz）、超同步（56.25 Hz）振荡，在dq坐标系下均表现为6.25 Hz振荡，同时在直流电压和直流电流中也出现了6.25 Hz的振荡频率。初步判断振荡发生的原因是：风电场功率快速变化时，站间骤然变化的直流电压引起了直流电流发生振荡，直流电流通过直流通路造成MMC子模块电容电压产生振荡 ...
刘一民 +5 more
core +1 more source
Research on Flexible Interconnection of Urban Power Grid [PDF]
, 2023 [Introduction] Due to its flexibility and rapid control ability, voltage source converter based high voltage direct current (VSC-HVDC) technology can be used in asynchronous grid interconnection, renewable energy grid-connection, and urban grid power ...
Jinchuan GUO +3 more
core +1 more source
, 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
core +1 more source
Design and Application of Three-Dimensional Digitization and Intelligent Operation System for Converter Station [PDF]
, 2023 [Introduction] In response to the pain points of the operation and maintenance of the converter station, the design methods of the three-dimensional digitization and intelligent operation system are proposed, and the actual application is performed in ...
Hao ZHANG +5 more
core +1 more source
Capacitor Voltage Ripple and Harmonics Analysis in MMC [PDF]
, 2023 [Introduction] The rapid development of VSC-HVDC provides practical support for MMC (Modular Multi-Level Converter) topology. Takes a half bridge MMC converter as an example, the relationship between steady-state capacitor voltage fluctuation, harmonic ...
Gang LI +4 more
core +1 more source