Support Vector Machine Based Method of Earthed Fault Location in Neutral Un-Effectual Grounded Power System

Abstract:

Abstract. Neutral un-effectual grounded system (NUGS) is widely used in Chinese medium voltage power distribution network. However, existing earthed fault location methods in NUGS are not satisfactory in practical application due to weak fault current and unstable arc. Based on analysis of spectrum characteristics of current signals in single-phase earthed fault feeder, this paper proposed an earthed fault location method based on support vector machine (SVM). Firstly, the zero sequence current signal was sampled, and its spectrum was gotten by discrete Fourier transform. Secondly, the three dimensional feature vector that constituted by fundament, harmonic, inter harmonic component, had been extracted as the input of SVM. Furthermore, the SVM was trained with the samples obtained by simulation under different fault distance, different fault resistance and different fault close angle. Finally, the earthed fault feeder is selected using the trained SVM. The simulation results indicate that the fault location by the presented method is more precise.

• Periodical: Applied Mechanics and Materials (Volume 737)
• Pages: 226-233
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.737.226
• Online since: March 2015
• Authors: Fei Jin Peng*, Xiao Yun Huang, Hong Yuan Huang, Zhi Wen Xie
• Keywords: Discrete Fourier Transform, Neutral Uneffectual Grounded System, Power Distribution System, Single Phase Earthed Fault Location, Support Vector Machine (SVM)

References

[1] D. Xinzhou, and S. Shenxing, Identifying Single-Phase-to-Ground Fault Feeder in Neutral Non effectively Grounded Distribution System Using Wavelet Transform,. Power Delivery, IEEE Transactions on Power Delivery, vol. 23, no. 4, pp.1829-1837.

DOI: 10.1109/tpwrd.2008.917924

[2] A. A. Girgis, C. M. Fallon, and D. L. Lubkeman, A fault location technique for rural distribution feeders, IEEE Trans. Ind. Appl., vol. 29, no. 6, pp.1170-1175, Dec. (1993).

DOI: 10.1109/28.259729

[3] K. Srinivasan and A. St-Jacques, A new fault location algorithm for radial transmission lines with loads, IEEE Trans. Power Del., vol. 18, no. 3, pp.1679-1682, Jul. (2003).

DOI: 10.1109/61.32658

[4] Y. Liao, Generalized fault-location methods for overhead electric distribution systems, IEEE Trans. Power Del., vol. 26, no. 1, pp.53-64, Jan. (2011).

DOI: 10.1109/tpwrd.2010.2057454

[5] S. Zaizhong, and Zh. Huifen, P. Zhencun, et al. With the injection of small current grounding system single-phase line selection and positioning,. Power Systems, in Chinese, vol. 20, no. 2: 11-12, (1996).

[6] M. Kezunovic, Smart fault location for smart grid, IEEE Trans. Smart Grid., vol. 2, no. 1, pp.11-22, Mar. (2011).

DOI: 10.1109/tsg.2011.2118774

[7] Zeng Xiangjun, Yin Xianggen, Zhang Zhe, et al. Study for Negative Sequence Current Distributing and Ground Fault Protection in Middle Voltage Power Systems,. Proceedings of the CSEE, in Chinese, vol. 21, no. 6: pp.84-88, (2001).

[8] B. Ravikumar, D. Thukaramand, H. P. Khincha, Application of support vector machines for fault diagnosis in power transmission system, IET Gener. Transm. Distrib., vol. 2, no. l, pp.119-130, (2008).

DOI: 10.1049/iet-gtd:20070071

[9] IEC 61000-4-7: 1991, Electromagnetic Compatibility (EMC)–Part 4-7: Testing and measurement techniques-General guide on harmonics and inter- harmonics measurements and instrumentation, for power supply systems and equipment connected thereto[S]. IEC, (1991).

DOI: 10.3403/02743713