Influence of low-frequency transmission system control on differential protection and optimization strategy
As a fault occurs on lines of a two-terminal low-frequency transmission system, fault currents will be suppressed when frequency converters adopt negative sequence current suppression strategy. Under such a circumstance, currents on both sides of the line show weak feed and traversal characteristics...
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| Format: | Article |
| Language: | zho |
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Editorial Department of Electric Power Engineering Technology
2025-05-01
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| Series: | 电力工程技术 |
| Subjects: | |
| Online Access: | https://doi.org/10.12158/j.2096-3203.2025.03.015 |
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| _version_ | 1849735777099972608 |
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| author | Yangang SHI Haiyong ZHU Liwen LU Yi LU Defeng QIU Yizhe LIN |
| author_facet | Yangang SHI Haiyong ZHU Liwen LU Yi LU Defeng QIU Yizhe LIN |
| author_sort | Yangang SHI |
| collection | DOAJ |
| description | As a fault occurs on lines of a two-terminal low-frequency transmission system, fault currents will be suppressed when frequency converters adopt negative sequence current suppression strategy. Under such a circumstance, currents on both sides of the line show weak feed and traversal characteristics, leading to poor sensitivity or even failure to operate of the traditional phase-based line differential protection. To solve the above problem, the two-terminal low-frequency transmission system based on modular multilevel matrix converter (M3C) topology is constructed. And the fault electrical characteristics and phasor differential protection adaptability of single-phase grounding and two-phase short-circuit faults of low-frequency lines are analyzed. Then, a fault control strategy is proposed to highlight fault characteristics by suppressing the positive sequence current output of the power control station, thereby improving the braking characteristics and sensitivity of differential protection. Finally, a real-time digital simulator (RTDS) model is built based on a low-frequency transmission project, and the proposed control strategy is simulated and verified against typical faults. The results show that the proposed fault control strategy can effectively solve the problem of insufficient sensitivity of phasor differential protection for low-frequency line fault, being of well value in engineering application. |
| format | Article |
| id | doaj-art-e0c49d22bfc14ac6b6eb371b0f3d5c2d |
| institution | DOAJ |
| issn | 2096-3203 |
| language | zho |
| publishDate | 2025-05-01 |
| publisher | Editorial Department of Electric Power Engineering Technology |
| record_format | Article |
| series | 电力工程技术 |
| spelling | doaj-art-e0c49d22bfc14ac6b6eb371b0f3d5c2d2025-08-20T03:07:27ZzhoEditorial Department of Electric Power Engineering Technology电力工程技术2096-32032025-05-0144316016910.12158/j.2096-3203.2025.03.015shiyangangInfluence of low-frequency transmission system control on differential protection and optimization strategyYangang SHI0Haiyong ZHU1Liwen LU2Yi LU3Defeng QIU4Yizhe LIN5NR Electric Co., Ltd., Nanjing 211102, ChinaNR Electric Co., Ltd., Nanjing 211102, ChinaNR Electric Co., Ltd., Nanjing 211102, ChinaState Grid Zhejiang Electric Power Co., Ltd. Research Institute, Hangzhou 310000, ChinaNR Electric Co., Ltd., Nanjing 211102, ChinaNR Electric Co., Ltd., Nanjing 211102, ChinaAs a fault occurs on lines of a two-terminal low-frequency transmission system, fault currents will be suppressed when frequency converters adopt negative sequence current suppression strategy. Under such a circumstance, currents on both sides of the line show weak feed and traversal characteristics, leading to poor sensitivity or even failure to operate of the traditional phase-based line differential protection. To solve the above problem, the two-terminal low-frequency transmission system based on modular multilevel matrix converter (M3C) topology is constructed. And the fault electrical characteristics and phasor differential protection adaptability of single-phase grounding and two-phase short-circuit faults of low-frequency lines are analyzed. Then, a fault control strategy is proposed to highlight fault characteristics by suppressing the positive sequence current output of the power control station, thereby improving the braking characteristics and sensitivity of differential protection. Finally, a real-time digital simulator (RTDS) model is built based on a low-frequency transmission project, and the proposed control strategy is simulated and verified against typical faults. The results show that the proposed fault control strategy can effectively solve the problem of insufficient sensitivity of phasor differential protection for low-frequency line fault, being of well value in engineering application.https://doi.org/10.12158/j.2096-3203.2025.03.015modular multilevel matrix converter (m3c)low-frequency transmission systempositive sequence current suppression strategyfault characteristics of low-frequency linelow-frequency line protectionphasor differential protection |
| spellingShingle | Yangang SHI Haiyong ZHU Liwen LU Yi LU Defeng QIU Yizhe LIN Influence of low-frequency transmission system control on differential protection and optimization strategy 电力工程技术 modular multilevel matrix converter (m3c) low-frequency transmission system positive sequence current suppression strategy fault characteristics of low-frequency line low-frequency line protection phasor differential protection |
| title | Influence of low-frequency transmission system control on differential protection and optimization strategy |
| title_full | Influence of low-frequency transmission system control on differential protection and optimization strategy |
| title_fullStr | Influence of low-frequency transmission system control on differential protection and optimization strategy |
| title_full_unstemmed | Influence of low-frequency transmission system control on differential protection and optimization strategy |
| title_short | Influence of low-frequency transmission system control on differential protection and optimization strategy |
| title_sort | influence of low frequency transmission system control on differential protection and optimization strategy |
| topic | modular multilevel matrix converter (m3c) low-frequency transmission system positive sequence current suppression strategy fault characteristics of low-frequency line low-frequency line protection phasor differential protection |
| url | https://doi.org/10.12158/j.2096-3203.2025.03.015 |
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