DC fault analysis of VSC based multi-terminal HVDC systems
DC fault analysis of VSC based multi-terminal HVDC systems
复制标题
DOI：
10.1049/cp.2012.1961
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
J. Rafferty;Lie Xu;D. Morrow
中科院分区：
文献类型：
--
作者：
J. Rafferty;Lie Xu;D. Morrow
强烈建议使用基于电压源换流器（VSC）的高压直流输电来实现各种电力网络的互连。然而，VSC 容易受到直流故障的影响，特别是过流对转换器 IGBT 造成的潜在损坏，是必须解决的问题。本文分析了基于 VSC 的高压直流输电系统在不同直流故障条件下的行为。以由单个发送端和接收端组成的两端多端直流系统作为案例研究。发现直流线间故障后对直流母线电容器的再充电可以充当交流故障电流的附加阻尼，有助于减少交流电流偏移。此外，我们还发现，如果没有采取有效的接地方案，由于直流线路接地故障而导致系统形成潜在的接地回路，可能会导致严重的过电流。 （6页）
The use of Voltage Source Converter (VSC) based HVDC transmission has been strongly suggested for the interconnection of various power networks. However, VSCs susceptibility to DC faults, particularly the potential damage caused to the converter IGBTs due to overcurrent, is an issue that must be addressed. This paper analyses the behaviour of a VSC-based HVDC system under varying DC fault conditions. A two terminal multi-terminal DC system, consisting of a single sending and receiving end is used as a case study. Recharging of the DC link Capacitor after a DC line-to-line fault was found to act as additional damping for the AC fault current, helping to reduce the AC current offset. Also, it was discovered that the development of potential earth loops with the system as a result of DC lineto-earth faults can lead to substantial overcurrent if an effective earthing scheme is not in place. (6 pages)