DC Fault Analysis and Transient Average Current Based Fault Detection for Radial MTDC System
DC Fault Analysis and Transient Average Current Based Fault Detection for Radial MTDC System
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径向 MTDC 系统的直流故障分析和基于瞬态平均电流的故障检测
DOI：
10.1109/tpwrd.2019.2941054
复制
发表时间：
2020-06
影响因子：
4.4
通讯作者：
Song Guobing
中科院分区：
文献类型：
--
作者：
Li Jiapeng;Li Yujun;Xiong Liansong;Jia Ke;Song Guobing
由于基于VSC或半桥的MMC变换器在直流故障期间对直流故障电流的控制能力有限，因此在直流故障发生后的几毫秒内立即隔离直流故障线路对于多端直流系统具有重要意义。在“电容器放电阶段”期间的直流故障隔离失败可能导致整个MTDC系统由于IGBT的快速阻断而无法运行。因此，直流故障电流的初始分析对于系统保护设计，特别是故障检测是必不可少的。因此，首次提出了仅保留故障直流网络高频分量的暂态简化模型。结果表明，该模型不仅简化了复杂的直流网络，而且可以清晰地表达出几毫秒级的故障直流电流。根据故障电缆电流与正常电缆电流的显著差异，进一步提出了一种利用线路电流暂态平均值的低计算复杂度、高灵敏度的非单位直流故障检测方法。基于PSCAD/EMTDC的数值仿真结果表明，所提出的暂态简化模型对初始直流故障分析的准确性和基于暂态平均电流的故障检测方法的有效性。与传统的基于电流变化率的保护方法相比，该方法具有采样频率低、抗故障能力强、对外界噪声和数据丢失具有鲁棒性等优点。
It is of great importance for multi-terminal DC (MTDC) system to immediately isolate the DC fault line within several milliseconds after DC fault due to VSC or half-bridge based MMC converters with limited ability to control DC fault current during DC fault. Failing of the DC fault isolation during “Capacitor Discharging Stage” may lead to the overall MTDC system out of operation with the fast blocking of IGBTs. Therefore, initial DC fault current analysis is essential for system protection design, especially for fault detection. Accordingly, a transient simplified model is first proposed with only high-frequency components of the fault DC network reserved. As a result, the original complex DC network is largely reduced and the fault DC current with several milliseconds can be clearly expressed based on the proposed model. According to the distinct differences between the current of faulty cable and that of healthy cable, a non-unit DC fault detection method utilizing the transient average value of line current with low computational complexity and high-sensitivity is further proposed. Numerical simulations based on PSCAD/EMTDC have been carried out, which well-demonstrate the accuracy of the proposed transient simplified model for initial DC fault analysis and the effectiveness of the proposed transient average current based fault detection scheme. Compared with the traditional change of rate of current based protection method, the proposed one stands out for relatively low sampling frequency, high fault resistance tolerant ability, and robustness against outside noise and data missing.
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DOI：
10.1049/cp.2012.1961
发表时间：
2012
期刊：
--
影响因子：
--
作者：
J. Rafferty;Lie Xu;D. Morrow
通讯作者：
J. Rafferty;Lie Xu;D. Morrow
基于电流暂态平均值的网状 MTdc 系统直流故障检测
影响因子：
7.7
作者：
Yujun Li;Jiapeng Li;Liansong Xiong;Xian Zhang;Zhao Xu
通讯作者：
Zhao Xu
影响因子：
4.4
作者：
M. Bucher;C. Franck
通讯作者：
M. Bucher;C. Franck
影响因子：
7.7
作者：
Satpathi, Kuntal;Yeap, Yew Ming;Geddada, Nagesh
通讯作者：
Geddada, Nagesh
影响因子：
1
作者：
Zheren Zhang;Zheng Xu
通讯作者：
Zheren Zhang;Zheng Xu