Overcurrent Mechanism and Suppression Control for MMC Arms in Hybrid Cascaded HVDC System
The hybrid cascaded HVDC system employs a line commutated converter (LCC) as the rectifier and an LCC in series with multiple paralleled modular multilevel converters (MMCs) as the inverter. MMC arms are susceptible to overcurrent following a severe AC fault at the receiving end, however, its fundam...
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China electric power research institute
2025-01-01
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| Series: | CSEE Journal of Power and Energy Systems |
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| Online Access: | https://ieeexplore.ieee.org/document/10436594/ |
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| author | Nan Zhang Xiaodong Li Zheren Zhang Zheng Xu |
| author_facet | Nan Zhang Xiaodong Li Zheren Zhang Zheng Xu |
| author_sort | Nan Zhang |
| collection | DOAJ |
| description | The hybrid cascaded HVDC system employs a line commutated converter (LCC) as the rectifier and an LCC in series with multiple paralleled modular multilevel converters (MMCs) as the inverter. MMC arms are susceptible to overcurrent following a severe AC fault at the receiving end, however, its fundamental mechanism has not been totally revealed. Therefore, this article explores the overcurrent characteristics on MMC arms, in terms of both the DC and AC components. Apart from the DC overcurrent component induced by the commutation failure (CF) of the inverter LCC, the AC overcurrent component is also significant. It dramatically depends on the coupling effects among the AC systems of the inverter side. Further, corresponding suppression strategies are proposed, which are applicable to different receiving-end AC fault scenarios. Eventually, the time-domain simulation results from PSCAD/EMTDC validate the effectiveness of the proposed overcurrent suppression control. It is also demonstrated that the presented methods can not only suppress overcurrent for MMC arms, but also reduce the imbalanced power between two sides, as well as improve the dynamic performances of the entire system. |
| format | Article |
| id | doaj-art-ab8589820eaf4e3ab2e31a7c8aee0704 |
| institution | OA Journals |
| issn | 2096-0042 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | China electric power research institute |
| record_format | Article |
| series | CSEE Journal of Power and Energy Systems |
| spelling | doaj-art-ab8589820eaf4e3ab2e31a7c8aee07042025-08-20T02:15:32ZengChina electric power research instituteCSEE Journal of Power and Energy Systems2096-00422025-01-0111130631710.17775/CSEEJPES.2022.0046010436594Overcurrent Mechanism and Suppression Control for MMC Arms in Hybrid Cascaded HVDC SystemNan Zhang0Xiaodong Li1Zheren Zhang2Zheng Xu3College of Electric Engineering, Zhejiang University,Hangzhou,China,310027College of Electric Engineering, Zhejiang University,Hangzhou,China,310027College of Electric Engineering, Zhejiang University,Hangzhou,China,310027College of Electric Engineering, Zhejiang University,Hangzhou,China,310027The hybrid cascaded HVDC system employs a line commutated converter (LCC) as the rectifier and an LCC in series with multiple paralleled modular multilevel converters (MMCs) as the inverter. MMC arms are susceptible to overcurrent following a severe AC fault at the receiving end, however, its fundamental mechanism has not been totally revealed. Therefore, this article explores the overcurrent characteristics on MMC arms, in terms of both the DC and AC components. Apart from the DC overcurrent component induced by the commutation failure (CF) of the inverter LCC, the AC overcurrent component is also significant. It dramatically depends on the coupling effects among the AC systems of the inverter side. Further, corresponding suppression strategies are proposed, which are applicable to different receiving-end AC fault scenarios. Eventually, the time-domain simulation results from PSCAD/EMTDC validate the effectiveness of the proposed overcurrent suppression control. It is also demonstrated that the presented methods can not only suppress overcurrent for MMC arms, but also reduce the imbalanced power between two sides, as well as improve the dynamic performances of the entire system.https://ieeexplore.ieee.org/document/10436594/Hybrid cascaded HVDC systemline commutated convertermodular multilevel converterovercurrent suppression control |
| spellingShingle | Nan Zhang Xiaodong Li Zheren Zhang Zheng Xu Overcurrent Mechanism and Suppression Control for MMC Arms in Hybrid Cascaded HVDC System CSEE Journal of Power and Energy Systems Hybrid cascaded HVDC system line commutated converter modular multilevel converter overcurrent suppression control |
| title | Overcurrent Mechanism and Suppression Control for MMC Arms in Hybrid Cascaded HVDC System |
| title_full | Overcurrent Mechanism and Suppression Control for MMC Arms in Hybrid Cascaded HVDC System |
| title_fullStr | Overcurrent Mechanism and Suppression Control for MMC Arms in Hybrid Cascaded HVDC System |
| title_full_unstemmed | Overcurrent Mechanism and Suppression Control for MMC Arms in Hybrid Cascaded HVDC System |
| title_short | Overcurrent Mechanism and Suppression Control for MMC Arms in Hybrid Cascaded HVDC System |
| title_sort | overcurrent mechanism and suppression control for mmc arms in hybrid cascaded hvdc system |
| topic | Hybrid cascaded HVDC system line commutated converter modular multilevel converter overcurrent suppression control |
| url | https://ieeexplore.ieee.org/document/10436594/ |
| work_keys_str_mv | AT nanzhang overcurrentmechanismandsuppressioncontrolformmcarmsinhybridcascadedhvdcsystem AT xiaodongli overcurrentmechanismandsuppressioncontrolformmcarmsinhybridcascadedhvdcsystem AT zherenzhang overcurrentmechanismandsuppressioncontrolformmcarmsinhybridcascadedhvdcsystem AT zhengxu overcurrentmechanismandsuppressioncontrolformmcarmsinhybridcascadedhvdcsystem |