柔性直流配电系统高频突变量距离保护

doi:10.19595/j.cnki.1000-6753.tces.181590

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (33727 KB) HTML
输出: BibTeX | EndNote (RIS)

摘要柔性直流配电系统可以高效、灵活地接入新能源电源与直流负荷,成为配电网研究热点之一。然而受电力电子装置控制影响,直流故障时换流器提供的短路电流非线性强,其故障等值阻抗时变,保护难以基于变化的阻抗识别故障区域。针对该问题,通过分析故障高频信号在换流器开关过程中的回路,建立不受控制策略影响的换流器高频恒定阻抗等效模型,为保护研究奠定基础。进而提出一种基于高频突变量的距离保护,该方法利用系统故障前后几ms内的电气量信息,通过提取电压高频分量映射故障区段,结合保护整定配合实现故障区域识别。在PSCAD/EMTDC电磁暂态仿真平台上搭建了六端柔性直流配电系统精细化模型,仿真结果表明,所提方法具有良好的速动性和选择性,能够可靠识别故障区域,并且有较好的耐受过渡电阻和抗噪声能力。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	贾科
	赵其娟
	冯涛
	赵冠琨
	毕天姝

关键词 ：柔性直流配电系统, 换流器, 高频突变量, 故障识别, 距离保护

Abstract：Flexible DC distribution system is becoming one of the research hotspots of distribution network because it can connect new energy sources and DC load efficiently and flexibly. However, due to the influence of power electronic device control, the short-circuit current provided by the converter is highly nonlinear when DC faults occur, and its fault equivalent impedance is time-varying, which is difficult to identify the fault area based on the varying impedance. Aiming at this problem, the equivalent model of high frequency constant impedance of converter that is not affected by control strategy is established by analyzing the circuit of fault high frequency signal in the switching process of converter. Then a distance protection based on high-frequency fault component is proposed using the electrical information of milliseconds before and after the system fault, maps the fault section by extracting the high-frequency voltage component, and realizes fault area identification by combining protection setting and coordination. A detailed model of six-terminal flexible DC distribution system is built on the PSCAD/EMTDC electromagnetic transient simulation platform. The simulation results show that the proposed method has good speed and selectivity, can reliably identify fault areas, and has good resistance to transition resistance and noise.

Key words： Flexible DC distribution system converter high-frequency fault component fault identification distance protection

收稿日期: 2018-10-08 出版日期: 2020-01-17

PACS:

TM771

基金资助:国家重点研发计划（2018YFB0904104）,国家自然科学基金项目（51725702,51407067）和2018年国网公司科技指南项目（面向柔性直流接入的交流侧新型保护控制设计技术研究）资助

通讯作者: 贾科男,1986年生,教授,博士生导师,研究方向为电力系统保护与控制、新型配电网故障定位与系统自我恢复。E-mail: ke.jia@ncepu.edu.cn

作者简介: 赵其娟女,1994年生,硕士研究生,研究方向为直流配电系统保护与控制。E-mail: zhaoqijuanzqj@163.com

引用本文:

贾科, 赵其娟, 冯涛, 赵冠琨, 毕天姝. 柔性直流配电系统高频突变量距离保护[J]. 电工技术学报, 2020, 35(2): 383-394. Jia Ke, Zhao Qijuan, Feng Tao, Zhao Guankun, Bi Tianshu. High-Frequency Fault Component Distance Protection for Flexible DC Distribution System. Transactions of China Electrotechnical Society, 2020, 35(2): 383-394.

链接本文:

https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.181590 https://dgjsxb.ces-transaction.com/CN/Y2020/V35/I2/383

[1] 李露露, 雍静, 梁仕斌, 等. 民用低压直流供电系统保护综述[J]. 电工技术学报, 2015, 30(22): 133-143.
Li Lulu, Yong Jing, Liang Shibin, et al.A review of civil low voltage DC distribution system pro- tection[J]. Transactions of China Electrotechnical Society, 2015, 30(22): 133-143.
[2] 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 flxible DC distribution system[J]. Transa- ctions of China Electrotechnical Society, 2018, 33(8): 1863-1874.
[3] 李斌, 何佳伟. 柔性直流配电系统故障分析及限流方法[J]. 中国电机工程学报, 2015, 35(12): 3026-3036.
Li Bin, He Jiawei.DC fault analysis and current limiting technique for VSC-based DC distribution system[J]. Proceedings of the CSEE, 2015, 35(12): 3026-3036.
[4] 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.
[5] Monadi M, Zamani M A, Koch-Ciobotaru C, et al.A communication-assisted protection scheme for direct- current distribution networks[J]. Energy, 2016, 109: 578-591.
[6] 嵇康, 邰能灵, 刘剑, 等. 基于暂态电压的多端柔性直流线路保护方案[J]. 电力科学与技术学报, 2018, 33(1): 3-10.
Ji Kang, Tai Nengling, Liu Jian, et al.Protection scheme for multi-terminal VSC-HVDC lines based on transient voltage[J]. Journal of Electric Power Science and Technology, 2018, 33(1): 3-10.
[7] 王艳婷, 张保会, 范新凯. 柔性直流电网架空线路快速保护方案[J]. 电力系统自动化, 2016, 40(21): 13-19.
Wang Yanting, Zhang Baohui, Fan Xinkai.Fast protection scheme for overhead transmission lines of VSC-based HVDC grid[J]. Automation of Electric Power Systems, 2016, 40(21): 13-19.
[8] 刘鑫蕊, 谢志远, 孙秋野, 等. 低压双极性直流微网故障分析及保护方案[J]. 电网技术, 2016, 40(3): 749-755.
Liu Xinrui, Xie Zhiyuan, Sun Qiuye, et al.Fault analysis and protection for LV bipolar DC micro- grid[J]. Power System Technology, 2016, 40(3): 749-755.
[9] Azizi S, Sanaye-Pasand M.A traveling-wave-based methodology for wide-area fault location in multi- terminal DC systems[J]. IEEE Transactions on Power Delivery, 2014, 29(6): 2552-2560.
[10] 董新洲, 王珺, 施慎行. 配电线路单相接地行波保护的原理与算法[J]. 中国电机工程学报, 2013, 33(10): 154-160, 6.
Dong Xinzhou, Wang Jun, Shi Shenxing.Principle and algorithm of traveling waves based single- phase-to-ground protection for distribution lines[J]. Proceedings of the CSEE, 2013, 33(10): 154-160, 6.
[11] 李猛, 贾科, 毕天姝, 等. 适用于直流配电网的测距式保护[J]. 电网技术, 2016, 40(3): 719-724.
Li Meng, Jia Ke, Bi Tianshu, et al.Fault distance estimation-based protection for DC distribution networks[J]. Power System Technology, 2016, 40(3): 719-724.
[12] Yang J, Fletcher J E, O'Reilly J. Multiterminal DC wind farm collection grid internal fault analysis and protection design[J]. IEEE Transactions on Power Delivery, 2010, 25(4): 2308-2318.
[13] 徐殿国, 李彬彬, 周少泽. 模块化多电平高压变频技术研究综述[J]. 电工技术学报, 2017, 32(20): 104-116.
Xu Dianguo, Li Binbin, Zhou Shaoze.Overview of the modular multilevel converter based high voltage motor drive[J]. Transactions of China Electro- technical Society, 2017, 32(20): 104-116.
[14] 李军, 万文军, 刘志刚. 一种阶跃函数在矩形时间窗口频域特性的分析方法[J]. 电力自动化设备, 2013, 33(11): 111-116, 122.
Li Jun, Wan Wenjun, Liu Zhigang.Method for analyzing frequency-domain characteristics of step function in rectangular time window[J]. Electric Power Automation Equipment, 2013, 33(11): 111-116, 122.
[15] 李斌, 李晔, 何佳伟. 具有直流故障清除能力的MMC子模块关键性能研究[J]. 中国电机工程学报, 2016, 36(8): 2114-2122.
Li Bin, Li Ye, He Jiawei.Research on the key properties of MMC sub-modules with DC fault eliminating capability[J]. Proceedings of the CSEE, 2016, 36(8): 2114-2122.
[16] 范志华, 苗世洪, 刘子文, 等. 模块化多电平换流器子模块故障特性分析与解耦控制策略[J]. 电工技术学报, 2018, 33(16): 3707-3718.
Fan Zhihua, Miao Shihong, Liu Ziwen, et al.Modular multilevel converter sub-module fault characteristics analysis and decoupling control strategy[J]. Transa- ctions of China Electrotechnical Society, 2018, 33(16): 3707-3718.
[17] 杨用春, 肖湘宁, 郭世枭, 等. 基于模块化多电平变流器的统一电能质量调节器工程实验装置研究[J]. 电工技术学报, 2018, 33(16): 3743-3755.
Yang Yongchun, Xiao Xiangning, Guo Shixiao, et al.Research of unified power quality conditioner engineering experiment device based on modular multilevel converter[J]. Transactions of China Electrotechnical Society, 2018, 33(16): 3743-3755.
[18] 徐政, 肖晃庆, 张哲任. 模块化多电平换流器主回路参数设计[J]. 高电压技术, 2015, 41(8): 2514-2527.
Xu Zheng, Xiao Huangqing, Zhang Zheren.Design of main circuit parameters of modular multilevel converters[J]. High Voltage Engineering, 2015, 41(8): 2514-2527.
[19] 姜山, 范春菊, 黄宁, 等. 电力电子变压器直流端口极间短路故障特性分析[J]. 中国电机工程学报, 2018, 38(5): 1301-1309.
Jiang Shan, Fan Chunju, Huang Ning, et al.Fault characteristic analysis of DC pole-to-pole fault in power electronic transformer[J]. Proceedings of the CSEE, 2018, 38(5): 1301-1309.
[20] 季振东. 级联型电力电子变压器关键技术研究[D].南京: 东南大学, 2015.
[21] 郝瑞祥, 杨晓峰, 薛尧, 等. 一种具有直流故障限流能力的模块化多电平换流器[J]. 电工技术学报, 2017, 32(6): 172-180.
Hao Ruixiang, Yang Xiaofeng, Xue Yao, et al.A novel modular multilevel converter with DC fault current limiting capability[J]. Transactions of China Electrotechnical Society, 2017, 32(6): 172-180.