Protection Scheme for Flexible DC Distribution Lines With High Resistance and Strong Noise Endurance Ability

被引：0

作者：

Dai Z. ^{[1
]}

Li Y. ^{[1
]}

Jiao Y. ^{[1
]}

Chen S. ^{[1
]}

Zhang Y. ^{[1
]}

Yu L. ^{[1
]}

机构：

[1] Hebei Key Laboratory of Distributed Energy Storage and Microgrid, North China Electric Power University, Baoding

来源：

Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 10期

基金：

中国国家自然科学基金;

关键词：

fault identification; flexible DC distribution line; high impedance fault; Pearson correlation coefficient; power grid noise; wavelet transform;

D O I：

10.13336/j.1003-6520.hve.20210931

中图分类号：

学科分类号：

摘要：

Aiming at the problems of slow speed and low reliability of high impedance fault identification with noise interference in flexible DC distribution line protection, we propose a line protection scheme based on the current correlation. First, the characteristics of line short-circuit current under different fault types are analyzed. On this base, the current accumulation of positive and negative poles is used to identify the fault type, and the current Pearson correlation coefficient is used to identify the fault location. The correlation criterion is based on the filtered local current. The communication channels only transmit the discrimination logic values at both sides of the line, which have low requirements for signal synchronization and can effectively suppress the noise interference. Finally, the feasibility of the proposed scheme is verified by PSCAD/EMTDC. The result shows that this scheme can reliably identify metallic short-circuit fault and high impedance grounding short-circuit fault with/without strong noise interference in the 0.5 ms data window of line currents, and is not affected by AC side faults and non-fault switching heavy loads. © 2022 Science Press. All rights reserved.

引用

页码：3966 / 3979

页数：13

共 28 条

[1] QI Qi, JIANG Qirong, XU Yanping, Research status and development prospect of flexible interconnection for smart distribution networks, Power System Technology, 44, 12, pp. 4664-4676, (2020)
[2] LIU Xianglong, LIU Youbo, YIN Hang, Et al., Network planning of AC/DC hybrid distribution system with power electronic transformers, High Voltage Engineering, 47, 4, pp. 1283-1294, (2021)
[3] JIANG Songhan, PENG Ke, XU Bingyin, Et al., Current situation and prospect of demonstration projects of DC distribution system, Electric Power Automation Equipment, 41, 5, pp. 219-231, (2021)
[4] YUAN Zhichang, GUO Peiqian, LIU Guowei, Et al., Review on control and protection for renewable energy integration through VSC-HVDC, High Voltage Engineering, 46, 5, pp. 1473-1488, (2020)
[5] YANG Jinggang, XIAO Xiaolong, LIU Ruihuang, Et al., Characteristic analysis and chain overvoltage suppression for bipolar short circuit in photovoltaic MVDC collection and integration system, High Voltage Engineering, 47, 1, pp. 205-213, (2021)
[6] DAI Zhihui, GE Hongbo, YAN Siqi, Et al., Fault analysis of flexible DC distribution system, Transactions of China Electrotechnical Society, 33, 8, pp. 1863-1874, (2018)
[7] BARAN M E, MAHAJAN N R., Overcurrent protection on voltage-source-converter-based multiterminal DC distribution systems, IEEE Transactions on Power Delivery, 22, 1, pp. 406-412, (2007)
[8] MEGHWANI A, SRIVASTAVA S C, CHAKRABARTI S., A non-unit protection scheme for DC microgrid based on local measurements, IEEE Transactions on Power Delivery, 32, 1, pp. 172-181, (2017)
[9] SNEATH J, RAJAPAKSE A D., Fault detection and interruption in an earthed HVDC grid using ROCOV and hybrid DC breakers, IEEE Transactions on Power Delivery, 31, 3, pp. 973-981, (2016)
[10] MONADI M, ZAMANI M A, KOCH-CIOBOTARU C, Et al., A communication-assisted protection scheme for direct-current distribution networks, Energy, 109, pp. 578-591, (2016)

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