DC protection coordination for multi-terminal HB-MMC-based HVDC grids

Seyed Hassan Ashrafi Niaki, Zhe Chen, Birgitte Bak-Jensen, Kamran Sharifabadi, Zhou Liu, Shuju Hu

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Fast progress of High Voltage Direct Current (HVDC) technology has been considerable over the past decades. Emerging Modular Multilevel Converter (MMC) provides power systems with promising solutions to integrate large-scale renewable energy sources, as well as multiple asynchronous power grids. Consequently, implementation of a multi-terminal HVDC transmission system has been easier using MMC converters. However, protection of multi-terminal MMC-based HVDC grids under DC fault conditions is a challenge for the industry. This study sheds light on concept of system-level DC protection coordination for multi-terminal HVDC grids. Although, there are different protection methods for HVDC transmission systems including multi-terminal ones, there are no well-defined protection coordination strategies for transmission links protection and belonging HVDC converters under DC fault conditions. The proposed protection coordination prevents unnecessary tripping of MMCs in the multi-area HVDC grids and supports the system with minimum effect on healthy parts. For the first time, different HVDC Converter Tripping (HCT) profiles are presented based on a fully selective protection strategy and their characteristics are discussed comprehensively. Simulation results demonstrate the effectiveness of the proposed strategy for multi-terminal MMC-based HVDC grids. The proposed coordination can be applied to DC grid code requirements of meshed HVDC grids in the future.

TidsskriftIET Renewable Power Generation
Udgave nummer2
Sider (fra-til)187-199
Antal sider13
StatusUdgivet - 3 feb. 2024


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