Impedance modeling of DC grid considering the frequency-dependent characteristics of cable and overhead line parameters
The fault characteristics of direct current (DC) grids can be analyzed by addressing the grid damping characteristics. However,the frequency-dependent characteristics of the transmission line parameters are usually ignored in the conventional grid impedance modeling methods,which cannot accurately r...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
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Editorial Department of Electric Power Engineering Technology
2022-11-01
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| Series: | 电力工程技术 |
| Subjects: | |
| Online Access: | https://www.epet-info.com/dlgcjs/article/html/210912417 |
| _version_ | 1797987910028361728 |
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| author | CHEN Siwei LI Baohong LIU Tianqi HE Chuan ZHANG Min WANG Tengxin |
| author_facet | CHEN Siwei LI Baohong LIU Tianqi HE Chuan ZHANG Min WANG Tengxin |
| author_sort | CHEN Siwei |
| collection | DOAJ |
| description | The fault characteristics of direct current (DC) grids can be analyzed by addressing the grid damping characteristics. However,the frequency-dependent characteristics of the transmission line parameters are usually ignored in the conventional grid impedance modeling methods,which cannot accurately reflect the grid damping characteristics. To compare and analyze the fault currents characteristics of the DC grids with cables and overhead lines,an impedance model of DC grid considering the frequency-dependent characteristics of the transmission line parameters based on vector fitting is proposed in this paper. Then,the proposed model is applied to compare and analyze the fault current features including time delays,initial rising rates and amplitudes of the DC grids with cables and overhead lines. Meanwhile,the impacts of the DC grids key parameters on the fault current characteristics of the two DC grids are investigated. Compared with the sweeping results of the frequency-dependent line model,the proposed model performs well in reflecting the damping characteristic of the DC grid,where the root square error is less than 0.6,informing that the proposed model is much more accurate than the simplified model. Finally,the simulation is conducted in a symmetrical monopolar two-terminal DC grid with pole-to-pole fault. The simulation results show that the fault current rising rate of the DC grid with cables is 24.96% higher than that of the DC grid with overhead lines when the arm inductance is increased,which validates that the fault currents of the DC grids with cables are more sensitive to the inductive key parameters than the DC grids with overhead lines. |
| first_indexed | 2024-04-11T07:55:33Z |
| format | Article |
| id | doaj.art-1923e5e263df499d81740d7c8e1883b7 |
| institution | Directory Open Access Journal |
| issn | 2096-3203 |
| language | zho |
| last_indexed | 2024-04-11T07:55:33Z |
| publishDate | 2022-11-01 |
| publisher | Editorial Department of Electric Power Engineering Technology |
| record_format | Article |
| series | 电力工程技术 |
| spelling | doaj.art-1923e5e263df499d81740d7c8e1883b72022-12-22T04:35:56ZzhoEditorial Department of Electric Power Engineering Technology电力工程技术2096-32032022-11-0141610110810.12158/j.2096-3203.2022.06.012Impedance modeling of DC grid considering the frequency-dependent characteristics of cable and overhead line parametersCHEN Siwei0LI Baohong1LIU Tianqi2HE Chuan3ZHANG Min4WANG Tengxin5College of Electrical Engineering, Sichuan University, Chengdu 610065, ChinaCollege of Electrical Engineering, Sichuan University, Chengdu 610065, ChinaCollege of Electrical Engineering, Sichuan University, Chengdu 610065, ChinaCollege of Electrical Engineering, Sichuan University, Chengdu 610065, ChinaState Grid Shanxi Electric Power Company Research Institute, Taiyuan 030001, ChinaState Grid Shanxi Electric Power Company Research Institute, Taiyuan 030001, ChinaThe fault characteristics of direct current (DC) grids can be analyzed by addressing the grid damping characteristics. However,the frequency-dependent characteristics of the transmission line parameters are usually ignored in the conventional grid impedance modeling methods,which cannot accurately reflect the grid damping characteristics. To compare and analyze the fault currents characteristics of the DC grids with cables and overhead lines,an impedance model of DC grid considering the frequency-dependent characteristics of the transmission line parameters based on vector fitting is proposed in this paper. Then,the proposed model is applied to compare and analyze the fault current features including time delays,initial rising rates and amplitudes of the DC grids with cables and overhead lines. Meanwhile,the impacts of the DC grids key parameters on the fault current characteristics of the two DC grids are investigated. Compared with the sweeping results of the frequency-dependent line model,the proposed model performs well in reflecting the damping characteristic of the DC grid,where the root square error is less than 0.6,informing that the proposed model is much more accurate than the simplified model. Finally,the simulation is conducted in a symmetrical monopolar two-terminal DC grid with pole-to-pole fault. The simulation results show that the fault current rising rate of the DC grid with cables is 24.96% higher than that of the DC grid with overhead lines when the arm inductance is increased,which validates that the fault currents of the DC grids with cables are more sensitive to the inductive key parameters than the DC grids with overhead lines.https://www.epet-info.com/dlgcjs/article/html/210912417frequency-dependent characteristicsvector fittingimpedance modelingdirect current (dc) grid with cablesdc grid with overhead linesfault current |
| spellingShingle | CHEN Siwei LI Baohong LIU Tianqi HE Chuan ZHANG Min WANG Tengxin Impedance modeling of DC grid considering the frequency-dependent characteristics of cable and overhead line parameters 电力工程技术 frequency-dependent characteristics vector fitting impedance modeling direct current (dc) grid with cables dc grid with overhead lines fault current |
| title | Impedance modeling of DC grid considering the frequency-dependent characteristics of cable and overhead line parameters |
| title_full | Impedance modeling of DC grid considering the frequency-dependent characteristics of cable and overhead line parameters |
| title_fullStr | Impedance modeling of DC grid considering the frequency-dependent characteristics of cable and overhead line parameters |
| title_full_unstemmed | Impedance modeling of DC grid considering the frequency-dependent characteristics of cable and overhead line parameters |
| title_short | Impedance modeling of DC grid considering the frequency-dependent characteristics of cable and overhead line parameters |
| title_sort | impedance modeling of dc grid considering the frequency dependent characteristics of cable and overhead line parameters |
| topic | frequency-dependent characteristics vector fitting impedance modeling direct current (dc) grid with cables dc grid with overhead lines fault current |
| url | https://www.epet-info.com/dlgcjs/article/html/210912417 |
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