Abstract
Compared with the AC distribution network, the DC distribution network can absorb various new energy sources more efficiently, which is one of the important development direction of future research. However, due to the poor ability of the power electronic equipment to withstand the fault current. It is very important to identify the fault area by using the transient information within a few milliseconds. Line protection technology is very important to the safe and reliable operation of DC power distribution network. Based on the fault analysis and simulation of the current DC distribution line, the current supplied near the converter side is much larger than the short circuit current provided by the line. There is energy between the internal and external fault. In order to characterize this difference, studied by using the energy difference method to determine the internal and external fault lines. A 5 layers Db wavelet transform is applied to the fault current of the DC distribution line, using low frequency the square of wavelet coefficients and to characterize the stationary current energy band in the time window. The proposed protection scheme is tested in RT-LAB, and the test results show that the energy protection scheme can accurately determine the fault section under different transition resistances and different fault locations.
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Acknowledgements
The authors would like to thank the following funds for their help: Project supported by the National Key R&D Program of China (2016YFB0900600); National Natural Science Foundation of China (51877174); State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology, 2018KF001); State Key Laboratory of Electrical Insulation and Power Equipment (Xi’an Jiaotong University, EIPE18201).
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Duan, J., Li, Z., Yang, Q., Li, H. (2020). Research on Energy Protection of DC Distribution Line. In: Xue, Y., Zheng, Y., Rahman, S. (eds) Proceedings of PURPLE MOUNTAIN FORUM 2019-International Forum on Smart Grid Protection and Control. PMF PMF 2019 2021. Lecture Notes in Electrical Engineering, vol 584. Springer, Singapore. https://doi.org/10.1007/978-981-13-9779-0_5
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DOI: https://doi.org/10.1007/978-981-13-9779-0_5
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