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ORIGINAL RESEARCH article

Front. Energy Res.
Sec. Sustainable Energy Systems
Volume 12 - 2024 | doi: 10.3389/fenrg.2024.1426902
This article is part of the Research Topic Emerging Technologies for the Construction of Renewable Energy-Dominated Power System View all 24 articles

AC Fault ride-through control strategy of MMC-UHVDC system with hierarchical connection mode

Provisionally accepted
Mingli Ping Mingli Ping 1*Chong Niu Chong Niu 2Xinhe Liu Xinhe Liu 2Meijuan Yang Meijuan Yang 2Xianwei Wang Xianwei Wang 2
  • 1 HVDC Transmission Technology Department, Other, Xi’an, China
  • 2 Other, Xi’an, China

The final, formatted version of the article will be published soon.

    The ultra-high voltage direct current (UHVDC) transmission composed of modular multilevel converters (MMC) is an important technology for large-scale centralized transmission of renewable energy. In UHVDC system, temporary faults in the AC power grid system are a high probability fault, and the fault control strategy affects the safety and reliability of system operation. This paper studies on the condition of AC power grid faults occurring at the receiving converter station. Firstly, study the system characteristics after the occurrence of AC faults, and use theoretical analysis to derive the trend of DC voltage changes of each converter valve. Then, an AC fault ride-through control strategy with high power transmission capability is proposed with hierarchical connection structure, the strategy controls the system to synchronously reduce DC voltage and AC active power after a fault, maximizing the retention of the system's transmission capacity during the occurrence of faults, thereby reduce power shock in the system. Finally, a simulation model of the dual ended system has built based on the PSCAD simulation platform. The simulation results show that when a single-phase ground fault and a three-phase ground fault occur in the high valve group at the receiving station, the system can retain about 83% and 50% of the transmission capacity during the fault period, respectively. Meanwhile, there is no serious overvoltage or overcurrent phenomenon in the system. The simulation results verified the effectiveness of the proposed control strategy.

    Keywords: MMC-UHVDC, Hierarchical connection mode, AC fault ride-through, reducing DC voltage, high power transmission capability

    Received: 02 May 2024; Accepted: 03 Jul 2024.

    Copyright: © 2024 Ping, Niu, Liu, Yang and Wang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Mingli Ping, HVDC Transmission Technology Department, Other, Xi’an, China

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