基于不同时段内积投影的灵活接地系统高阻故障选线方法

doi:10.19595/j.cnki.1000-6753.tces.221878

摘要
图/表
参考文献
相关文章 (1)

全文: PDF (4522 KB)
输出: BibTeX | EndNote (RIS)

摘要针对灵活接地配电系统在发生高阻故障时,无法实现准确选线的问题,通过分析灵活接地系统故障特征得出,中性点小电阻投入后故障馈线与健全馈线在零序电流幅值上存在差异,同时,小电阻投入后母线零序电压发生明显降低,由此,本文提出了一种基于中性点小电阻投入前后不同时段下计算内积投影的高阻故障选线方法,具体为：首先,将小电阻投入后各馈线零序电流对投入前的母线零序电压做内积投影,由此构建判据1;其次,将小电阻投入后各馈线零序电流对投入前的中性点电流做内积投影,由此构建判据2;最后,当判据1与2判定的故障馈线结果一致时,由此,得到故障馈线。大量仿真实验表明,在非同步采样、数据缺失与电弧等故障工况下,本文方法具有良好的稳定性,与现有方法对比可知,本文方法判定时间短,且适应电流互感器反接工况。

	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
	王晓卫
	刘伟博
	郭亮
	梁振锋

关键词 ：灵活接地系统, 高阻故障, 不同时段, 内积投影

Abstract：High impedance faults are a common form of distribution network faults, accounting for about 5% to 10% of medium voltage distribution network faults, often accompanied by arcing, which can easily cause safety hazards. Due to the weak fault characteristics of high impedance faults, most faulty feeder detection methods only have high accuracy for low-impedance faults. This is insufficient to support the principle of proximity and fast isolation of ground faults. Recently, some high impedance fault line selection methods have been proposed, but most of them suffer from complex principles, single criteria, and equipment measurement accuracy that does not meet the demand. To address these problems, this paper proposed high impedance fault line selection methods based on inner product projection of different time periods for flexible grounding systems. It can accurately detect the faulty feeder at high impedance faults through the characteristic quantities of voltage and current before and after small resistance input.
Firstly, the inner product projection of each feeder’s zero-sequence current after small resistance input onto the bus zero-sequence voltage before small resistance input is constructed as criteria 1. Secondly, the inner product projection of each feeder’s zero-sequence current after small resistance input onto the neutral point zero-sequence current before small resistance input is constructed as criteria 2. Finally, when the results of the faulty feeder determined by criterion 1 and criterion 2 are the same, the final faulty feeder result is obtained. The fault detection method fully uses the fault characteristics under different time periods, solves the influence of bus zero-sequence voltage drop after small resistance input and a single criterion on the detection accuracy, and greatly simplifies the faulty feeder detection principle, resulting in a highly accurate faulty feeder detection method.
The simulation results using a flexible grounding system show that. Firstly, the faulty feeder can be accurately determined under high impedance fault conditions considering different fault feeders, fault distance, fault initial phase angle, overcompensation, ground resistance and noise interference. Second, considering asynchronous sampling and missing data, where asynchronous sampling is up to 11ms and data missing is up to 85%, the proposed method still has good stability. Then, the accuracy of the proposed method is verified under three arc parameters. Finally, the proposed method is compared with two flexible grounding system methods under four complex operating conditions, where a current transformer reversal was considered, the proposed method takes the shortest time of 0.05s, and there is no misjudgment.
The following conclusions can be drawn from the simulation analysis: (1) Compared with existing methods, the proposed method greatly simplifies the principle of detection criterion and effectively overcomes the bus zero-sequence voltage reduction problem. Therefore, it is appropriate to use different time periods of fault characteristics. (2) The proposed method combines the inner product projection of each feeder current after small resistance input onto the bus voltage and neutral point current before small resistance input. It uses two types of criteria, both of which complement each other to improve the accuracy of fault feeder determination. (3) The proposed method is more capable of adapting to complex working conditions, and the calculation time of the criterion is short. In addition, the faulty feeder can still be accurately determined when the current transformer is reversed.

Key words： Flexible grounding systems high impedance fault different time periods inner product projection

收稿日期: 2022-10-07

PACS:

TM77

基金资助:国家自然科学基金（52177114, 61403127）和国网江西省电力有限公司科技项目（521820220016, 521820210005）资助项目

通讯作者: 王晓卫男,1983年生,博士,副教授,硕士生导师,研究方向为配电网故障选线与定位、高阻故障检测、电力工程信号处理。E-mail：proceedings@126.com

作者简介: 刘伟博男,1997年生,硕士研究生,研究方向为新型配电系统高阻故障选线。E-mail：Lwei_bo@126.com

引用本文:

王晓卫, 刘伟博, 郭亮, 梁振锋. 基于不同时段内积投影的灵活接地系统高阻故障选线方法[J]. 电工技术学报, 0, (): 102-102. Wang Xiaowei, Liu Weibo, Guo Liang, Liang Zhenfeng. High Impedance Fault Line Selection Method Based on Inner Product Projection of Different Time Periods for Flexible Grounding Systems. Transactions of China Electrotechnical Society, 0, (): 102-102.

链接本文:

https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.221878 https://dgjsxb.ces-transaction.com/CN/Y0/V/I/102

[1] 刘宝稳, 曾祥君, 张慧芬, 等. 不平衡零序电压快速精准抑制与电压消弧全补偿优化控制方法[J]. 电工技术学报, 2022, 37(3): 645-654.
Liu Baowen, Zeng Xiangjun, Zhang Huifen, et al.Optimal control method for accurate and fast suppression of unbalanced zero-sequence voltage and voltage arc suppression full compensation[J]. Transactions of China Electrotechnical Society, 2022, 37(3): 645-654.
[2] Wang Xiaowei, Liu Weibo, Liang Zhenfeng, et al.Faulty feeder detection based on the integrated inner product under high impedance fault for small resistance to ground systems[J]. International Journal of Electrical Power & Energy Systems, 2022, 140: 108078.
[3] Liu Penghui, Du Shaotong, Sun Kang, et al.Single-line-to-ground fault feeder selection considering device polarity reverse installation in resonant grounding system[J]. IEEE Transactions on Power Delivery, 2021, 36(4): 2204-2212.
[4] 王宾, 崔鑫. 基于伏安特性动态轨迹的谐振接地系统弧光高阻接地故障检测方法[J]. 中国电机工程学报, 2021, 41(20): 6959-6968.
Wang Bin, Cui Xin.Detection method of arc high resistance grounding fault in resonant grounding system based on dynamic trajectory of volt-ampere characteristic[J]. Proceedings of the CSEE, 2021, 41(20): 6959-6968.
[5] 杨帆, 刘鑫星, 沈煜, 等. 基于零序电流投影系数的小电阻接地系统高阻接地故障保护[J]. 电网技术, 2020, 44(3): 1128-1133.
Yang Fan, Liu Xinxing, Shen Yu, et al.High resistance ground fault protection of low resistance grounding system based on zero sequence current projection coefficient[J]. Power System Technology, 2020, 44(3): 1128-1133.
[6] 王晓卫, 高杰, 吴磊, 等. 柔性直流配电网高阻接地故障检测方法[J]. 电工技术学报, 2019, 34(13): 2806-2819.
Wang Xiaowei, Gao Jie, Wu Lei, et al.A high impedance fault detection method for flexible DC distribution network[J]. Transactions of China Electrotechnical Society, 2019, 34(13): 2806-2819.
[7] Wei Xiangxiang, Wang Xiaowei, Gao Jie, et al.Faulty feeder detection for single-phase-to-ground fault in distribution networks based on transient energy and cosine similarity[J]. IEEE Transactions on Power Delivery, 2022, 37(5): 3968-3979.
[8] 邓丰, 梅龙军, 唐欣, 等. 基于时频域行波全景波形的配电网故障选线方法[J]. 电工技术学报, 2021, 36(13): 2861-2870.
Deng Feng, Mei Longjun, Tang Xin, et al.Faulty line selection method of distribution network based on time-frequency traveling wave panoramic waveform[J]. Transactions of China Electrotechnical Society, 2021, 36(13): 2861-2870.
[9] 喻锟, 胥鹏博, 曾祥君, 等. 基于模糊测度融合诊断的配电网接地故障选线[J]. 电工技术学报, 2022, 37(3): 623-633.
Yu Kun, Xu Pengbo, Zeng Xiangjun, et al.Grounding fault line selection of distribution networks based on fuzzy measures integrated diagnosis[J]. Transactions of China Electrotechnical Society, 2022, 37(3): 623-633.
[10] Liu Kangli, Zhang Sen, Li Baorun, et al.Flexible grounding system for single-phase to ground faults in distribution networks: a systematic review of developments[J]. IEEE Transactions on Power Delivery, 2022, 37(3): 1640-1649.
[11] 刘宝稳, 曾祥君, 张慧芬, 等. 有源柔性接地配电网弧光高阻接地故障检测方法[J]. 中国电机工程学报, 2022, 42(11): 4001-4013.
Liu Baowen, Zeng Xiangjun, Zhang Huifen, et al.Arc high resistance grounding fault detection method for active flexible grounding distribution network[J]. Proceedings of the CSEE, 2022, 42(11): 4001-4013.
[12] Tang Jinrui, Xiong Binyu, Li Yang, et al.Faulted feeder identification based on active adjustment of arc suppression coil and similarity measure of zero-sequence currents[J]. IEEE Transactions on Power Delivery, 2021, 36(6): 3903-3913.
[13] Wang Yuanyuan, Chen Qiaoshan, Zeng Xiangjun, et al.Faulty feeder detection based on space relative distance for compensated distribution network with IIDG injections[J]. IEEE Transactions on Power Delivery, 2021, 36(4): 2459-2466.
[14] 薛永端, 金鑫, 刘晓, 等. 灵活接地系统中配电网接地保护的适应性分析[J]. 电力系统自动化, 2022, 46(5): 112-121.
Xue Yongduan, Jin Xin, Liu Xiao, et al.Analysis on adaptability of grounding protection for distribution network in flexible grounded system[J]. Automation of Electric Power Systems, 2022, 46(5): 112-121.
[15] 杨帆, 任伟, 沈煜, 等. 消弧线圈并联小电阻系统接地故障灵活处理策略[J]. 供用电, 2019, 36(3): 44-49.
Yang Fan, Ren Wei, Shen Yu, et al.Grounding fault processing strategy in petersen coil paralleled small resistance grounding system[J]. Distribution & Utilization, 2019, 36(3): 44-49.
[16] 尹力, 孔令昌, 王冠华, 等. 基于负序电压变化量的灵活接地配电网永久性单相接地故障定位[J]. 电力自动化设备, 2023, 43(1): 83-89, 99.
Yin Li, Kong Lingchang, Wang Guanhua, et al.Permanent single-phase grounding fault location in flexible grounding distribution network based on negative-sequence voltage variation[J]. Electric Power Automation Equipment, 2023, 43(1): 83-89, 99.
[17] 王义凯, 尹项根, 乔健, 等. 协同多模接地控制的海洋核动力平台电网接地故障选线方法[J]. 电力自动化设备, 2022, 42(11): 176-182.
Wang Yikai, Yin Xianggen, Qiao Jian, et al.Grounding fault line selection method coordinated with multi-mode grounding control for power grid of marine nuclear power platform[J]. Electric Power Automation Equipment, 2022, 42(11): 176-182.
[18] 杨帆, 金鑫, 沈煜, 等. 基于零序导纳变化的灵活接地系统接地故障方向判别算法[J]. 电力系统自动化, 2020, 44(17): 88-94.
Yang Fan, Jin Xin, Shen Yu, et al.Dicrimination algorithm of grounding fault direction based on variation of zero-sequence admittance in flexible grounding system[J]. Automation of Electric Power Systems, 2020, 44(17): 88-94.
[19] 刘朋跃, 邵文权, 弓启明, 等. 利用零序电流相位变化特征的灵活接地系统故障选线方法[J]. 电网技术, 2022, 46(5): 1830-1838.
Liu Pengyue, Shao Wenquan, Gong Qiming, et al.Fault line detection of flexible grounding system based on phase variation characteristics of zero-sequence current[J]. Power System Technology, 2022, 46(5): 1830-1838.
[20] 李建蕊, 李永丽, 王伟康, 等. 基于零序电流与电压相位差变化的灵活接地系统故障选线方法[J]. 电网技术, 2021, 45(12): 4847-4855.
Li Jianrui, Li Yongli, Wang Weikang, et al.Fault line detection method for flexible grounding system based on changes of phase difference between zero sequence current and voltage[J]. Power System Technology, 2021, 45(12): 4847-4855.
[21] 叶远波, 汪胜和, 谢民, 等. 高阻接地故障时消弧线圈并联小电阻接地的控制方法研究[J]. 电力系统保护与控制, 2021, 49(19): 181-186.
Ye Yuanbo, Wang Shenghe, Xie Min, et al.Study on the control method of high impedance faults in the neutral via arc suppression coil paralleled with a low resistance grounded system[J]. Power System Protection and Control, 2021, 49(19): 181-186.
[22] 王宾, 崔鑫, 董新洲. 配电线路弧光高阻故障检测技术综述[J]. 中国电机工程学报, 2020, 40(1): 96-107, 377.
Wang Bin, Cui Xin, Dong Xinzhou.Overview of arc high impedance grounding fault detection technologies in distribution system[J]. Proceedings of the CSEE, 2020, 40(1): 96-107, 377.
[23] 秦苏亚, 薛永端, 刘砾钲, 等. 有源配电网小电流接地故障暂态特征及其影响分析[J]. 电工技术学报, 2022, 37(3): 655-666.
Qin Suya, Xue Yongduan, Liu Lizheng, et al.Transient characteristics and influence of small current grounding faults in active distribution network[J]. Transactions of China Electrotechnical Society, 2022, 37(3): 655-666.
[24] Gao Jie, Wang Xiaohua, Wang Xiaowei, et al.A high-impedance fault detection method for distribution systems based on empirical wavelet transform and differential faulty energy[J]. IEEE Transactions on Smart Grid, 2022, 13(2): 900-912.