|
|
|
| Pilot Protection Method of Flexible DC Grid Based on Linear Regression |
| Shu Hongchun1,2, Dai Yue1,2, An Na1,2, Tang Yutao1, Bo Zhiqian1 |
1. State Key Laboratory of Collaborative Innovation Center for Smart Grid Fault Detection Protection and Control Jointly Kunming University of Science and Technology Kunming 650500 China;
2. Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology Kunming 650500 China |
|
|
|
|
Abstract When a fault occurs in a flexible DC grid line, the line protection device needs to quickly and reliably remove the faulty line to ensure that the healthy line can operate normally to improve the safety and reliability of the transmission system. In this paper, a linear regression method for fast pilot protection of flexible DC grid is proposed. Firstly, the physical boundary formed by the modular multilevel converter (MMC) equivalent impedance and the smoothing reactor is analyzed for the attenuation of the high frequency components, and secondly, the current loop and the current flow of the healthy line are analyzed for the single-pole and double-pole faults of the transmission line, and then the regression coefficient of the short-time window current is used for the identification of faults inside and outside the area and the selection of the faulted pole according to the energy of the voltage mutation of the transmission line as the protection activation criterion. A simulation model of the flexible DC network is built on PSCAD to verify the protection scheme. The simulation results show that the protection method can reliably and accurately screen faults with good quick action, and has good transition resistance and applicability.
|
|
Received: 02 July 2021
|
|
|
| Fund:国家自然科学基金（52037003）和云南省重大专项（202002AF080001）资助项目 |
|
|
|
[1] 吴珊, 边晓燕, 张菁娴, 等. 面向新型电力系统灵活性提升的国内外辅助服务市场研究综述[J/OL]. 电工技术学报: 1-17[2022-04-02]. DOI: 10.19595/j.cnki. 1000-6753.tces.211730.
Wu Shan, Bian Xiaoyan, Zhang Jingxian, et al.A review of domestic and foreign ancillary services market for improving flexibility of new power system[J/OL]. Transactions of China Electrotechnical Society: 1-17[2022-04-02]. DOI: 10.19595/j.cnki.1000- 6753.tces. 211730.
[2] 姜云鹏, 任洲洋, 李秋燕, 等. 考虑多灵活性资源协调调度的配电网新能源消纳策略[J]. 电工技术学报, 2022, 37(7): 1820-1835.
Jiang Yunpeng, Ren Zhouyang, Li Qiuyan, et al.An accommodation strategy for renewable energy in distribution network considering coordinated dis- patching of multi-flexible resources[J]. Transactions of China Electrotechnical Society, 2022, 37(7): 1820-1835.
[3] 刘振亚. 全球能源互联网跨国跨洲互联研究及展望[J]. 中国电机工程学报, 2016, 36(19): 5103-5110.
Liu Zhenya.Research of global clean energy resource and power grid interconnection[J]. Proceedings of the CSEE, 2016, 36(19): 5103-5110.
[4] Zhu Fahua, Zheng Youfei, Guo Xulin, et al.Environ- mental impacts and benefits of regional power grid interconnections for China[J]. Energy Policy, 2005, 33(14): 1797-1805.
[5] 徐政, 刘高任, 张哲任. 柔性直流输电网的故障保护原理研究[J]. 高电压技术, 2017, 43(1): 1-8.
Xu Zheng, Liu Gaoren, Zhang Zheren.Research on fault protection principle of DC grids[J]. High Voltage Engineering, 2017, 43(1): 1-8.
[6] 付华, 陈浩轩, 李秀菊, 等. 含边界元件的MMC-MTDC直流侧单端量故障辨识方法[J]. 电工技术学报, 2021, 36(01): 215-226.
Fu Hua, Chen Haoxuan, Li Xiuju, et al.MMC-MTDC DC side single-ended quantity fault identification method with boundary elements[J]. Transactions of China Electrotechnical Society, 2021, 36(1): 215-226.
[7] 郭贤珊, 周杨, 梅念, 等. 张北柔性直流电网故障电流特性及抑制方法研究[J]. 中国电机工程学报, 2018, 38(18): 5438-5446.
Guo Xianshan, Zhou Yang, Mei Nian, et al.Research on the fault current characteristic and suppression strategy of Zhangbei project[J]. Proceedings of the CSEE, 2018, 38(18): 5438-5446.
[8] 汤广福, 王高勇, 贺之渊, 等. 张北500kV直流电网关键技术与设备研究[J]. 高电压技术, 2018, 44(7): 2097-2106.
Tang Guangfu, Wang Gaoyong, He Zhiyuan, et al.Research on key technology and equipment for Zhangbei 500kV DC grid[J]. High Voltage Engineering, 2018, 44(7): 2097-2106.
[9] 束洪春, 代月, 安娜, 等. 基于交叉重叠差分变换的MMC-HVDC线路故障识别方法[J]. 电工技术学报, 2021, 36(1): 203-214, 226.
Shu Hongchun, Dai Yue, An Na, et al.Fault identification method of MMC-HVDC line based on sequential overlapping derivative transform[J]. Transa- ctions of China Electrotechnical Society, 2021, 36(1): 203-214, 226.
[10] 宁连营, 邰能灵, 郑晓冬, 等. 基于自定义差分电流的MMC-HVDC输电线路纵联保护[J]. 电力系统自动化, 2017, 41(17): 87-93, 133.
Ning Lianying, Tai Nengling, Zheng Xiaodong, et al.Harmonic resonance analysis and suppression method for transmission cables between renewable energy sources and power grid[J]. Automation of Electric Power Systems, 2017, 41(17): 87-93, 133.
[11] 周光阳, 李妍, 何大瑞, 等. 含限流器的多端柔直系统故障保护策略[J]. 电工技术学报, 2020, 35(7): 1432-1443.
Zhou Guangyang, Li Yan, He Darui, et al.Protection scheme for VSC-MTDC system with fault current limiter[J]. Transactions of China Electrotechnical Society, 2020, 35(7): 1432-1443.
[12] 王帅, 毕天姝, 贾科. 基于小波时间熵的MMC- HVDC架空线路单极接地故障检测方法[J]. 电网技术, 2016, 40(7): 2179-2185.
Wang Shuai, Bi Tianshu, Jia Ke.Wavelet entropy based single pole grounding fault detection approach for MMC-HVDC overhead lines[J]. Power System Technology, 2016, 40(7): 2179-2185.
[13] Zhang Shuo, Zou Guibin, Wang Chuanjie, et al.A non-unit boundary protection of DC line for MMC- MTDC grids[J]. International Journal of Electrical Power & Energy Systems, 2020, 116: 105538.
[14] Tang Lanxi, Dong Xinzhou, Shi Shenxing, et al.A high-speed protection scheme for the DC transmission line of a MMC-HVDC grid[J]. Electric Power Systems Research, 2019, 168: 81-91.
[15] 周家培, 赵成勇, 李承昱, 等. 采用电流突变量夹角余弦的直流电网线路纵联保护方法[J]. 电力系统自动化, 2018, 42(14): 165-171.
Zhou Jiapei, Zhao Chengyong, Li Chengyu, et al.Pilot protection method for DC grid lines based on included angle cosine of fault current component[J]. Automation of Electric Power Systems, 2018, 42(14): 165-171.
[16] 姚为正, 行登江, 吴金龙, 等. 柔性直流电网超高速保护方案研究[J].电网技术, 2017, 41(6): 1710-1718.
Yao Weizheng, Xing Dengjiang, Wu Jinlong, et al.Study on ultra-high-speed protection method of flexible HVDC grid[J]. Power System Technology, 2017, 41(6): 1710-1718.
[17] 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.
[18] 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.
[19] 宋国兵, 侯俊杰, 郭冰. 基于主动探测式的柔性直流电网纵联保护[J]. 电网技术, 2020, 44(10): 4001-4010.
Song Guobing, Hou Junjie, Guo Bing.Pilot protection of flexible DC grid based on active detection[J]. Power System Technology, 2020, 44(10): 4001-4010.
[20] 董新洲, 汤兰西, 施慎行, 等. 柔性直流输电网线路保护配置方案[J]. 电网技术, 2018, 42(6): 1752-1759.
Dong Xinzhou, Tang Lanxi, Shi Shenxing, et al.Configuration scheme of transmission line protection for flexible HVDC grid[J]. Power System Technology, 2018, 42(6): 1752-1759.
[21] 牛洪波. 线性回归在“工业分析检验”竞赛选手选拔中的应用[J]. 烟台职业学院学报, 2018, 24(4): 86-92.
Niu Hongbo.Application of linear regression in the selection of contestants in "industrial analysis and inspection"[J]. Journal of Yantai Vocational College, 2018, 24(4): 86-92.
[22] 孙秀. 改进的贝叶斯方法在设备故障检测中的应用[D]. 济南: 齐鲁工业大学, 2018. |
|
|
|
2022, Vol. 37 
