Fast DC fault recovery technique for H-bridge MMC-based HVDC networks

作者: E. Kontos , R. Teixeira Pinto , P. Bauer

DOI: 10.1109/ECCE.2015.7310133

关键词: Electrical engineeringTransmission (telecommunications)EngineeringH bridgeGridModular designConvertersFault (power engineering)Topology (electrical circuits)High voltage

摘要: This paper proposes a post-fault control technique for H-bridge multilevel modular converters (MMC), which in combination with restoration framework, can achieve fast operation recovery multi-terminal direct current (MTdc) networks under different dc fault types. The studied network consists of four voltage-source (VSC) high voltage (HVdc) transmission. A meshed MTdc grid topology is used the connection two asynchronous grids offshore wind farms (OWFs). effect types on time evaluated. Following proposed steps, able to restore its within 7.4 s case pole-to-ground fault. reduced only 34 ms, if pole-to-pole occurs. To overcome main constraint that allows momentarily pole cables through MMC-VSC switch valves. In this way, discharged faster and thus, be restored. study showed that, strategy, an MMC-based after 158 ms without need expensive breakers.

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