An Active Ground Fault Location Method for Low-Voltage DC Lines Based on DFFT
For the problem of locating ground faults in low-voltage DC cable lines containing power electronic transformers, a single-ended volume fault location method using power electronic transformers with active injection is proposed for rapid fault detection and restoration of power supply. A sinusoidal...
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| Format: | Article |
| Language: | zho |
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State Grid Energy Research Institute
2023-04-01
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| Series: | Zhongguo dianli |
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| Online Access: | https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202211032 |
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| author | Fulu CAO Jinbin ZHAO Chao PAN Ling MAO Keqing QU |
| author_facet | Fulu CAO Jinbin ZHAO Chao PAN Ling MAO Keqing QU |
| author_sort | Fulu CAO |
| collection | DOAJ |
| description | For the problem of locating ground faults in low-voltage DC cable lines containing power electronic transformers, a single-ended volume fault location method using power electronic transformers with active injection is proposed for rapid fault detection and restoration of power supply. A sinusoidal voltage signal with 210 Hz frequency is injected into the low voltage side through the medium voltage port of the power electronic transformer. The characteristic signal will be transmitted to the low voltage side capacitor through the high frequency transformer, and the characteristic parameters of the capacitor voltage and current are extracted and identified using the fast Fourier transform to calculate the line impedance after the fault. At the same time, a secondary curve fitting construction curve method is used to reduce the impedance errors caused by spectral leakage and frequency domain reactance waveform oscillation and to obtain the accurate fault location. Finally, the PSCAD/EMTDC simulation results have verified the effectiveness of the proposed method for locating the ground faults of low-voltage DC lines containing power electronic transformers with noise interference resistance and certain transition resistance resistance. |
| format | Article |
| id | doaj-art-b3ef7c75754a4d83abb335ac935149fc |
| institution | OA Journals |
| issn | 1004-9649 |
| language | zho |
| publishDate | 2023-04-01 |
| publisher | State Grid Energy Research Institute |
| record_format | Article |
| series | Zhongguo dianli |
| spelling | doaj-art-b3ef7c75754a4d83abb335ac935149fc2025-08-20T02:04:30ZzhoState Grid Energy Research InstituteZhongguo dianli1004-96492023-04-0156418419110.11930/j.issn.1004-9649.202211032zgdl-56-04-caofuluAn Active Ground Fault Location Method for Low-Voltage DC Lines Based on DFFTFulu CAO0Jinbin ZHAO1Chao PAN2Ling MAO3Keqing QU4School of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaSchool of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaSchool of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaSchool of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaSchool of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaFor the problem of locating ground faults in low-voltage DC cable lines containing power electronic transformers, a single-ended volume fault location method using power electronic transformers with active injection is proposed for rapid fault detection and restoration of power supply. A sinusoidal voltage signal with 210 Hz frequency is injected into the low voltage side through the medium voltage port of the power electronic transformer. The characteristic signal will be transmitted to the low voltage side capacitor through the high frequency transformer, and the characteristic parameters of the capacitor voltage and current are extracted and identified using the fast Fourier transform to calculate the line impedance after the fault. At the same time, a secondary curve fitting construction curve method is used to reduce the impedance errors caused by spectral leakage and frequency domain reactance waveform oscillation and to obtain the accurate fault location. Finally, the PSCAD/EMTDC simulation results have verified the effectiveness of the proposed method for locating the ground faults of low-voltage DC lines containing power electronic transformers with noise interference resistance and certain transition resistance resistance.https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202211032power electronic transformersactive injectionlow voltage dc distribution linesfault locationsingle ended |
| spellingShingle | Fulu CAO Jinbin ZHAO Chao PAN Ling MAO Keqing QU An Active Ground Fault Location Method for Low-Voltage DC Lines Based on DFFT Zhongguo dianli power electronic transformers active injection low voltage dc distribution lines fault location single ended |
| title | An Active Ground Fault Location Method for Low-Voltage DC Lines Based on DFFT |
| title_full | An Active Ground Fault Location Method for Low-Voltage DC Lines Based on DFFT |
| title_fullStr | An Active Ground Fault Location Method for Low-Voltage DC Lines Based on DFFT |
| title_full_unstemmed | An Active Ground Fault Location Method for Low-Voltage DC Lines Based on DFFT |
| title_short | An Active Ground Fault Location Method for Low-Voltage DC Lines Based on DFFT |
| title_sort | active ground fault location method for low voltage dc lines based on dfft |
| topic | power electronic transformers active injection low voltage dc distribution lines fault location single ended |
| url | https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202211032 |
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