Practical Calculation for Bipolar Short-circuit Fault Current of Transmission Line in MMC-HVDC Grid

被引：0
|
作者：
Hao L. [1 ]
Li W. [1 ]
Wang Z. [1 ]
Gu Y. [2 ]
Wang G. [2 ]
机构：
[1] School of Electrical Engineering, Beijing Jiaotong University, Beijing
[2] NR Electric Co., Ltd., Nanjing
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2020年 / 44卷 / 05期
关键词：
Bipolar fault; Fault current; Flexible DC grid; Modular multilevel converter (MMC); Practical calculation;
D O I：
10.7500/AEPS20190729015
中图分类号：
学科分类号：
摘要：
As an effective means to support the adoption of high proportion of renewable energy, modular multilevel converter based high-voltage direct current (MMC-HVDC) has become an important development direction of power grid. The bipolar fault is the most serious fault in transmission lines. At present, state equations of DC system are usually written in s-domain, and then fault currents are solved based on the inverse Laplace transformation. A practical engineering calculation method for fault current is needed urgently. Zhangbei MMC-HVDC grid of China is taken as the research object, the fault characteristics and coupling mechanism for bipolar fault of transmission line are analyzed firstly. On this basis, the two ends of the fault lines near the valve side are regarded as two ports respectively, and the relationship between the fault currents and the voltages of the two ports are analyzed. Secondly, based on the idea that the voltage of the two ports of the positive and negative lines does not change too much, the annular MMC-HVDC grid is simplified to a two-terminal network or an open network. The practical calculation method of fault line current is obtained to calculate fault current directly, while it is no longer necessary to solve the high-order inverse Laplace transformation. Finally, the feasibility and efficiency of the practical calculation method are verified by comparing with the electromagnetic transient simulation results. © 2020 Automation of Electric Power Systems Press.
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页码：68 / 76
页数：8
相关论文
共 25 条
  • [1] Tang G., Luo X., Wei X., Multi-terminal HVDC and DC-grid technology, Proceedings of the CSEE, 33, 10, pp. 8-17, (2013)
  • [2] Xu Z., Xiao H., Zhang Z., Et al., Flexible HVDC Transmission System, (2017)
  • [3] Xu Z., Xue Y., Zhang Z., VSC-HVDC technology suitable for bulk power overhead line transmission, Proceedings of the CSEE, 34, 29, pp. 5051-5062, (2014)
  • [4] Tang X., Han M., Huo Q., Et al., Selection of VSC-HVDC application type matching requirements of different scenarios, Automation of Electric Power Systems, 43, 16, pp. 183-193, (2019)
  • [5] Candelaria J., Park J.D., VSC-HVDC system protection: a review of current methods, 2011 IEEE/PES Power Systems Conference and Exposition, pp. 1-7
  • [6] Li B., He J., Feng Y., Et al., Key techniques for protection of multi-terminal flexible DC grid, Automation of Electric Power Systems, 40, 21, pp. 2-12, (2016)
  • [7] Wang Y., Fu Y., Zeng Q., Et al., Review on key techniques for fault protection of flexible DC grids, High Voltage Engineering, 45, 8, pp. 2362-2374, (2019)
  • [8] Dong X., Tang L., Shi S., Et al., Configuration scheme of transmission line protection for flexible HVDC grid, Power System Technology, 42, 6, pp. 1752-1759, (2018)
  • [9] Xue Y., Xu Z., On the bipolar MMC-HVDC topology suitable for bulk power overhead line transmission: configuration, control, and DC fault analysis, IEEE Transactions on Power Delivery, 29, 6, pp. 2420-2429, (2014)
  • [10] Guo X., Cui X., Qi L., DC short-circuit fault analysis and protection for the overhead line bipolar MMC-HVDC system, Proceedings of the CSEE, 37, 8, pp. 2177-2185, (2017)
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