基于直流电流过零特征的柔性直流配电网保护方案研究Research on Protection Scheme of Flexible DC Distribution Grids Based on DC Current Zero-crossing Characteristics
郑涛;吴琼;吕文轩;王兴国;曹虹;
摘要(Abstract):
直流线路故障的快速、可靠识别,是柔性直流配电网发展在继电保护方面所面临的技术难点之一。针对基于具有直流故障自清除能力换流器的柔性直流配电系统,重点研究系统双极短路故障时的故障特性,并利用其故障电流迅速增大的特点,提出基于直流电流过零检测的保护方案。方案通过识别线路两端出现直流电流过零时刻的异同,确定故障线路并完成故障隔离。该保护方案原理简单且易于实现,能够快速识别故障线路。在PSCAD/EMTDC仿真软件中搭建柔性直流配电系统模型,通过大量仿真验证了该保护方案的可行性。
关键词(KeyWords): 柔性直流配电网;FBSM-MMC;电流过零;故障识别
基金项目(Foundation): 国家重点研发计划项目(智能电网技术与装备重点专项)(2016YFB0900600);; 国家电网公司科技项目(521104180002)~~
作者(Author): 郑涛;吴琼;吕文轩;王兴国;曹虹;
Email:
DOI: 10.13335/j.1000-3673.pst.2019.1051
参考文献(References):
- [1]戴志辉,葛红波,严思齐,等.柔性直流配电网故障分析[J].电工技术学报,2018,33(8):1863-1874.Dai Zhihui,Ge Hongbo,Yan Siqi,et al.Fault analysis of flexible DC distribution system[J]. Transactions of China Electrotechnical Society,2018,33(8):1863-1874(in Chinese).
- [2] Wang Y,Wen W,Zhang C,et al.Reactor sizing criterion for the continuous operation of meshed HB-MMC-based MTDC system under DC faults[J].IEEE Transactions on Industry Applications,2018,54(5):5408-5416.
- [3]戴志辉,黄敏,苏怀波,等.环状柔直配网线路的单端量保护原理[J].中国电机工程学报,2018,38(23):6825-6836+7117.Dai Zhihui,Huang Min,Su Huaibo,et al.Single-terminal quantity based line protection for ring flexible DC distribution system[J].Proceedings of the CSEE,2018,38(23):6825-6836+7117(in Chinese).
- [4]贾科,王聪博,毕天姝,等.考虑过渡电阻影响的柔性直流配电系统电流突变量保护[J].电网技术,2018,42(10):3187-3196.Jia Ke,Wang Congbo,Bi Tianshu,et al.A DC current derivative protection with capability of resisting high resistance for flexible DC distribution system[J].Power System Technology,2018,42(10):3187-3196(in Chinese).
- [5]汤兰西,董新洲,施慎行,等.柔性直流电网线路超高速行波保护原理与实现[J].电网技术,2018,42(10):3176-3186.Tang Lanxi,Dong Xinzhou,Shi Shenxing,et al.Principle and implementation of ultra-high-speed travelling wave based protection for transmission line of flexible HVDC grid[J]. Power System Technology,2018,42(10):3176-3186(in Chinese).
- [6] Wenig S,Goertz M,Hirsching C,et al.On full-bridge bipolar MMC-HVDC control and protection for transient fault and interaction studies[J].IEEE Transactions on Power Delivery,2018,33(6):2864-2873.
- [7]时伯年,赵宇明,孙刚.柔性直流配电网保护方案研究及实现[J].南方电网技术,2015,9(9):11-16.Shi Bonian,Zhao Yuming,Sun Gang.Research and implementation of protection scheme for MMC DC distribution network[J].Southern Power System Technology,2015,9(9):11-16(in Chinese).
- [8]李斌,何佳伟,李晔,等.基于边界特性的多端柔性直流配电系统单端量保护方案[J].中国电机工程学报,2016,36(21):5741-5749.Li Bin,He Jiawei,Li Ye,et al.Single-ended protection scheme based on boundary characteristic for the multi-terminal VSC-based DC distribution system[J].Proceedings of the CSEE,2016,36(21):5741-5749(in Chinese).
- [9]何佳伟,李斌,李晔,等.多端柔性直流电网快速方向纵联保护方案[J].中国电机工程学报,2017,37(23):6878-6887+7078.He Jiawei,Li Bin,Li Ye,et al.A fast directional pilot protection scheme for the MMC-based MTDC grid[J]. Proceedings of the CSEE,2017,37(23):6878-6887+7078(in Chinese).
- [10]王聪博,贾科,毕天姝,等.基于暂态电流波形相似度识别的柔性直流配电线路保护[J].电网技术,2019,3(10):3823-3832.Wang Congbo,Jia Ke,Bi Tianshu,et al.Transient current waveform similarity identification based protection for flexible DC distribution system[J].Power System Technology,2019,3(10):3823-3832(in Chinese).
- [11]贾科,宣振文,李晨曦,等.柔性直流配网中基于暂态高频阻抗比较的方向纵联保护[J].中国电机工程学报,2018,38(18):5343-5351.Jia Ke,Xuan Zhenwen,Li Chenxi,et al.A directional pilot protection based on phase angle of transient high-frequency impedance for flexible DC distribution grid[J].Proceedings of the CSEE,2018,38(18):5343-5351(in Chinese).
- [12]戴志辉,葛红波,严思齐,等.柔性直流配电网接地方式对故障特性的影响分析[J].电网技术,2017,41(7):2353-2364.Dai Zhihui,Ge Hongbo,Yan Siqi,et al.Effects of grounding mode on fault characteristics in flexible DC distribution system[J].Power System Technology,2017,41(7):2353-2364(in Chinese).
- [13] Yi X,Ningcan L,Zheng X,et al.Simplified transient calculation model in DC-side of VSC-HVDC systems based on MMC average value model[C]//2014 International Conference on Power System Technology.Chengdu,2014:2128-2133.
- [14]蔡新雷,宋国兵,高淑萍,等.VSC-HVDC直流电缆线路电流突变量极性纵联保护适用性研究[J].电力系统保护与控制,2013,41(5):10-16.Cai Xinlei, Song Guobing, Gao Shuping, et al. Research on applicability of current fault component polarity pilot directional protection for VSC-HVDC cable lines[J].Power System Protection and Control,2013,41(5):10-16(in Chinese).
- [15]顾垚彬,宋国兵,郭安祥,等.针对直流线路行波保护的雷击识别方法研究[J].中国电机工程学报,2018,38(13):3837-3845+4024.Gu Yaobin, Song Guobing, Guo Anxiang, et al. A lightning recognition method for DC line traveling-wave protection of HVDC[J].Proceedings of the CSEE,2018,38(13):3837-3845+4024(in Chinese).
- [16]刘可真,束洪春,于继来,等.±800kV特高压直流输电线路雷击暂态识别[J].电网技术,2013,37(11):3007-3014.Liu Kezhen,Shu Hongchun,Yu Jilai,et al.Transient identification of lightning strokes on±800kV UHVDC transmission lines[J].Power System Technology,2013,37(11):3007-3014(in Chinese).