A Backup Protection Scheme Based on the Response of the DC Circuit Breaker Tripping for the Meshed DC Distribution Networks

被引：0
|
作者：
Li N. [1 ]
Jiao Z. [1 ]
Qi S. [1 ]
机构：
[1] School of Electrical Engineering, Xi’an Jiaotong University, Shaanxi Province, Xi’an
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 15期
关键词：
backup protection; current limiting reactor; DC current second-order change rate; DC distribution network;
D O I：
10.13334/j.0258-8013.pcsee.213247
中图分类号：
学科分类号：
摘要：
DC distribution networks have become the development trend due to advantages of large power supply capacity, small loss and high power quality. However, the overload capacity of the converter is poor and the discharging current of the converter equivalent capacitor is large when a DC fault occurs, which puts forward high requirements for the rapidity and selectivity of the protection. In addition, DC circuit breakers(DCCBs) may fail to trip due to its difficulty in breaking DC fault current, and the protection is still needed to identify and isolate fault even after the converter is locked to ensure the restart and recovery of the system. Therefore, the backup protection for the meshed DC distribution networks should be paid attention to. This paper proposes a backup protection scheme for the meshed DC distribution networks on the basis of the transient DCCB tripping. When the DCCB on one side of the fault line fails to trip, the characteristics of the reactor voltage change rates on the non-fault lines are analyzed, and the fault identification and isolation scheme based on the DC current second-order change rates are proposed. Secondly, considering high resistance fault and asynchronous tripping of DCCBs, the additional criterion and locking criterion based on the DC current first-order and second-order change rates are proposed, respectively. Finally, the effectiveness of the proposed scheme is verified with PSCAD/EMTDC simulations, indicating that the scheme needs no communication and is unaffected by transition resistance and AC side faults, which can start quickly after the DCCB tripping and provide effective backup protection for the meshed DC distribution networks. ©2023 Chin.Soc.for Elec.Eng.
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页码：5785 / 5796
页数：11
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共 20 条
  • [1] JIANG Daozhuo, ZHENG Huan, Research status and developing prospect of DC distribution network [J], Automation of Electric Power Systems, 36, 8, pp. 98-104, (2012)
  • [2] HU Jingjing, XU Xidong, QIU Peng, A review of the protection methods in DC distribution system [J], Power System Technology, 38, 4, pp. 844-851, (2014)
  • [3] TANG Guangfu, LUO Xiang, Wei Xiaoguang, Multiterminal HVDC and DC-grid technology[J], Proceedings of the CSEE, 33, 10, pp. 8-17, (2013)
  • [4] NIAN Heng, KONG Liang, Review on fault protection technologies of DC microgrid[J], High Voltage Engineering, 46, 7, pp. 2241-2254, (2020)
  • [5] YANG Saizhao, XIANG Wang, WEN Jinyu, Review of DC fault protection methods for the MMC based DC grid[J], Proceedings of the CSEE, 39, 22, pp. 6600-6616, (2019)
  • [6] WANG Guangyuan, MA Xiao, LIN Xiangning, Single-ended high-sensitivity protection scheme for flexible DC distribution line based on ensemble learning[J], Proceedings of the CSEE, 41, 24, pp. 8447-8463, (2021)
  • [7] ZHANG Chenhao, SONG Guobing, DONG Xinzhou, Principle of Non-unit Traveling Wave Protection for VSC-HVDC Transmission Line UsingFault Current Initial Traveling Wave Fitting[J], Proceedings of the CSEE, 41, 8, pp. 2651-2661, (2021)
  • [8] LI Botong, YANG Xinlu, LI Bin, Overview on fault processing technology for DC distribution network based on fault blocking converter[J], Automation of Electric Power Systems, 44, 5, pp. 101-113, (2020)
  • [9] ZHAO Chengyong, LI Tan, YU Lujie, DC pole-to-ground fault characteristic analysis and converter fault recovery strategy of MMC-HVDC[J], Proceedings of the CSEE, 34, 21, pp. 3518-3526, (2014)
  • [10] LUO Fei, JIAO Zaibin, MA Zhao, Review of fault analysis and relay protection of DC distribution network [J], Distribution & Utilization, 35, 6, pp. 3-11, (2018)
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