High‐speed main protection for multiterminal LCC‐MMC‐UHVDC based on initial wave process comparison
Abstract The multiterminal LCC‐MMC‐UHVDC, which employs an LCC on the rectifier side and multiple FHMMCs on the inverter side, has emerged as a cutting‐edge technology. Nevertheless, distinct disparities in their protection requirements compared to those of conventional DC grids pose notable challen...
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| Format: | Article |
| Language: | English |
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Wiley
2024-12-01
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| Series: | IET Generation, Transmission & Distribution |
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| Online Access: | https://doi.org/10.1049/gtd2.13301 |
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| author | Yan Li Jun Li Guiyuan Li Runbin Cao Xinjie Zeng Ning Tong |
| author_facet | Yan Li Jun Li Guiyuan Li Runbin Cao Xinjie Zeng Ning Tong |
| author_sort | Yan Li |
| collection | DOAJ |
| description | Abstract The multiterminal LCC‐MMC‐UHVDC, which employs an LCC on the rectifier side and multiple FHMMCs on the inverter side, has emerged as a cutting‐edge technology. Nevertheless, distinct disparities in their protection requirements compared to those of conventional DC grids pose notable challenges in attaining the desired attributes. This paper first derives variation patterns in the time domain of initial waves under different fault conditions. By utilizing the theoretically calculated rate‐of‐change waveform for the backward current traveling wave in an external fault scenario as a reference, a main protection relay grounded in initial wave process comparison is proposed. This approach capitalizes on the disparity observed in internal faults with the theoretical waveform. To mitigate maloperations stemming from the employment of a non‐directional start‐up criterion in reverse fault scenarios, subtle noise patterns, mimicking the theoretical waveforms, are infused into the actual waveforms. This approach averts maloperations in reverse faults and obviates the need for added delays associated with directional start‐up criteria, thereby enhancing both speed and security. Case studies demonstrate that the proposed protection offers sufficient selectivity and a resistive tolerance of 600 ohms and boasts a speed of 0.2 ms, satisfying the requirements of 800 kV UHVDC systems. |
| format | Article |
| id | doaj-art-b45264194cad4a2fbadf296fb2d5ba5e |
| institution | DOAJ |
| issn | 1751-8687 1751-8695 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Wiley |
| record_format | Article |
| series | IET Generation, Transmission & Distribution |
| spelling | doaj-art-b45264194cad4a2fbadf296fb2d5ba5e2025-08-20T03:13:42ZengWileyIET Generation, Transmission & Distribution1751-86871751-86952024-12-0118244302432710.1049/gtd2.13301High‐speed main protection for multiterminal LCC‐MMC‐UHVDC based on initial wave process comparisonYan Li0Jun Li1Guiyuan Li2Runbin Cao3Xinjie Zeng4Ning Tong5Electric Power Research Institute of China Southern Power Grid (State Key Laboratory of HVDC) Guangzhou ChinaSchool of Automation Guangdong University of Technology Guangzhou P. R. ChinaElectric Power Research Institute of China Southern Power Grid (State Key Laboratory of HVDC) Guangzhou ChinaElectric Power Research Institute of China Southern Power Grid (State Key Laboratory of HVDC) Guangzhou ChinaSchool of Automation Guangdong University of Technology Guangzhou P. R. ChinaSchool of Automation Guangdong University of Technology Guangzhou P. R. ChinaAbstract The multiterminal LCC‐MMC‐UHVDC, which employs an LCC on the rectifier side and multiple FHMMCs on the inverter side, has emerged as a cutting‐edge technology. Nevertheless, distinct disparities in their protection requirements compared to those of conventional DC grids pose notable challenges in attaining the desired attributes. This paper first derives variation patterns in the time domain of initial waves under different fault conditions. By utilizing the theoretically calculated rate‐of‐change waveform for the backward current traveling wave in an external fault scenario as a reference, a main protection relay grounded in initial wave process comparison is proposed. This approach capitalizes on the disparity observed in internal faults with the theoretical waveform. To mitigate maloperations stemming from the employment of a non‐directional start‐up criterion in reverse fault scenarios, subtle noise patterns, mimicking the theoretical waveforms, are infused into the actual waveforms. This approach averts maloperations in reverse faults and obviates the need for added delays associated with directional start‐up criteria, thereby enhancing both speed and security. Case studies demonstrate that the proposed protection offers sufficient selectivity and a resistive tolerance of 600 ohms and boasts a speed of 0.2 ms, satisfying the requirements of 800 kV UHVDC systems.https://doi.org/10.1049/gtd2.13301HVDC power transmissionpower system protection |
| spellingShingle | Yan Li Jun Li Guiyuan Li Runbin Cao Xinjie Zeng Ning Tong High‐speed main protection for multiterminal LCC‐MMC‐UHVDC based on initial wave process comparison IET Generation, Transmission & Distribution HVDC power transmission power system protection |
| title | High‐speed main protection for multiterminal LCC‐MMC‐UHVDC based on initial wave process comparison |
| title_full | High‐speed main protection for multiterminal LCC‐MMC‐UHVDC based on initial wave process comparison |
| title_fullStr | High‐speed main protection for multiterminal LCC‐MMC‐UHVDC based on initial wave process comparison |
| title_full_unstemmed | High‐speed main protection for multiterminal LCC‐MMC‐UHVDC based on initial wave process comparison |
| title_short | High‐speed main protection for multiterminal LCC‐MMC‐UHVDC based on initial wave process comparison |
| title_sort | high speed main protection for multiterminal lcc mmc uhvdc based on initial wave process comparison |
| topic | HVDC power transmission power system protection |
| url | https://doi.org/10.1049/gtd2.13301 |
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