电工技术学报  2025, Vol. 40 Issue (4): 1268-1286    DOI: 10.19595/j.cnki.1000-6753.tces.240210
电力系统与综合能源 |
含逆变型分布式电源的配电网馈线终端告警信息校正及故障定位方法
李宗博1, 崔一嘉1, 王昊晴2, 郗乙搏3
1.东北电力大学现代电力系统仿真控制与绿色电能新技术教育部重点实验室 吉林 132012;
2.中国电力科学研究院有限公司 北京 100192;
3.国网宁夏电力有限公司超高压公司 银川 750000
Method of Alarm Information Correction and Fault Location for Distribution Network with Inverter-Interfaced Distributed Generation
Li Zongbo1, Cui Yijia1, Wang Haoqing2, Xi Yibo3
1. Key Laboratory of Modern Power System Simulation and control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China;
2. China Electric Power Research Institute Beijing 100192 China;
3. Ultra High Voltage Company State Grid Ningxia Electric Power Co. Ltd Yinchuan 750000 China
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摘要 逆变型分布式电源（IIDG）使配电网存量馈线终端（FTU）存在漏误告警问题,同时外部环境也会使告警信息不正确上报,难以准确定位故障区段。该文考虑IIDG和环境因素的耦合影响,提出一种FTU告警信息校正及故障定位方法。首先,根据各馈线首端电流特征,提出单双重故障及故障类别的检测方法。其次,考虑不可测IIDG和分支负荷的影响,利用正序电流幅值比和相邻区段电流相似性分别提出对称/不对称短路的识别方法,进而校验初始定位结果的准确性。再次,若定位结果未包含全部故障区段,以分支线路和IIDG的接入点为边界,利用短路电流特征提出疑似故障发生区域的筛选方法,并根据短路识别方法研判故障区段,实现告警信息的校验与修正。最后,在PSCAD中搭建IEEE 33节点标准算例和某县实际配电网的仿真模型,验证了单双重故障检测、短路识别判据及故障区域划分等告警信息校正和故障定位方法的有效性。
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李宗博
崔一嘉
王昊晴
郗乙搏
关键词 ： 逆变型分布式电源,  故障区段定位,  告警信息校正,  正序电流幅值比,  电流相似性分析    
Abstract：The integration of inverter-interfaced distributed generation (IIDG) into distribution networks introduces issues of missing or false alarms at the existing feeder terminal unit (FTU). Simultaneously, external environmental factors can distort the reported fault information of FTUs, making it challenging to locate faults accurately. Considering the coupled impact of IIDG and environmental factors, this paper proposes a method for correcting FTU fault information and fault location by fusing alarm information and partial telemetry.
Firstly, the fault type is judged according to the comparison of the number of lines, current mutation time, and amplitude of the short-circuit current characteristic at the switch. Then, the verification method of initial positioning results and the verification and correction method of alarm information are proposed. Based on the ratio of positive-sequence current amplitudes, a symmetric short circuit identification method is proposed by using the positive sequence current at the exit of the circuit and two adjacent sections. The effect of undetectable IIDGs is eliminated by rotating the leading phase current by 120° and subtracting the lagging phase current. Considering the type of unmeasured load, an asymmetric short circuit identification method based on the current similarity in adjacent sections is proposed. Then, the accuracy of the initial fault location results is judged. If the initial fault location result contains the real fault section, the location is considered accurate, and only the location result needs to be modified. If the real fault section is not included, a hierarchical analysis method of short-circuit characteristics of the distribution network is proposed. The distribution network is divided into several regions using the access points of branch lines or IIDG as boundaries. Short-circuit current characteristics are used to assess the fault occurrence area, and the short-circuit identification method filters fault sections, achieving the validation and correction of fault information. Finally, a standard example of IEEE 33 nodes and a model of the actual distribution network are built in PSCAD to verify the validity of alarm information correction and fault location methods.
The following conclusions can be drawn from the simulation analysis. (1) When the double faults of different feeders occur, there are at least 2 lines with short circuit characteristics and an interval of no less than 20 ms between the current mutation time. When the double fault of the same feeder occurs, the three-phase short-circuit amplitude is no longer symmetrical, which is taken to be greater than 1.05 or less than 0.95. In addition to the above two cases, a single fault occurs in the line. (2) For symmetrical short circuits, the ratio of positive-sequence current amplitudes between the line outlet and the fault point is about 1, while the ratio of positive-sequence current amplitudes in the upstream and downstream sections of the fault point is not less than 1.43. The fault section can be accurately investigated according to this feature. For asymmetric short circuits, the differential current amplitude of the neighboring segments of the fault section is significantly larger than the fixed value, even up to tens of times the gap effect, which can effectively identify the fault section.
(3) Combining the proposed area division method of the distribution network and the short circuit identification method achieves the verification and correction of alarm information and improves computational efficiency.
Key words： Inverter-interfaced distributed generators    fault section location    alarm information correction    amplitude ratio of positive sequence current    currents similarity analysis   
收稿日期: 2024-01-30     
PACS: TM721  
基金资助:国家电网公司科技项目（5108-202218280A-2-367-XG）和东北电力大学博士科研启动基金项目（BSJXM-2022102）资助
通讯作者: 李宗博 男,1992年生,讲师,硕士生导师,研究方向为电力系统继电保护、人工智能在电力系统中的应用等。E-mail: lizb@neepu.edu.cn   
作者简介: 崔一嘉 女,1999年生,硕士研究生,研究方向为配电网故障定位。E-mail: Yj_CCCui@outlook.com
引用本文:   
李宗博, 崔一嘉, 王昊晴, 郗乙搏. 含逆变型分布式电源的配电网馈线终端告警信息校正及故障定位方法[J]. 电工技术学报, 2025, 40(4): 1268-1286. Li Zongbo, Cui Yijia, Wang Haoqing, Xi Yibo. Method of Alarm Information Correction and Fault Location for Distribution Network with Inverter-Interfaced Distributed Generation. Transactions of China Electrotechnical Society, 2025, 40(4): 1268-1286.
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