Print Email Facebook Twitter Non-unit protection method for MMC-HVDC grids based on selective drop rate of voltage traveling waves Title Non-unit protection method for MMC-HVDC grids based on selective drop rate of voltage traveling waves Author Dehghan Marvasti, F. (TU Delft Intelligent Electrical Power Grids; Yazd University) Mirzaei, Ahmad (Yazd University) Savaghebi, Mehdi (Technical University of Denmark) Lekić, A. (TU Delft Intelligent Electrical Power Grids) Popov, M. (TU Delft Intelligent Electrical Power Grids) Date 2024 Abstract Fast, sensitive, and selective protection principles are one of the major challenges in the feasibility of modular multi-terminal (MMC) high voltage direct current (HVDC) grids. Rate of change of voltage (ROCOV) and transient-based solutions are the traditional and widely accepted protection principles. Despite the speed and practicality of these solutions, they generally suffer from sensitivity and selectivity issues, particularly when dealing with high-resistance faults and low-size current limiting inductors (CLIs). To improve upon these methods, this paper proposes a new primary protection method that utilizes a selective drop rate of fault-generated voltage traveling waves (TW) to detect internal DC line faults. This is achieved by a comprehensive analysis of the line-mode fault-generated voltage (LFGV) under various internal and external fault scenarios. As the key fault characteristics, the proposed method exploits the minimum points of initial LFGV and the corresponding time to form the basis of the proposed protection method. The effectiveness of this approach is evaluated using a four-terminal MMC-HVDC grid in PSCAD/EMTDC. Compared to ROCOV and transient-based solutions, the proposed method identifies internal faults up to 1250 Ω with fast response, while maintaining its practicality and independence to CLI size. Subject Fault-generated voltage traveling waveMMC-HVDC protectionPrimary protectionTraveling wave protection To reference this document use: http://resolver.tudelft.nl/uuid:8ce9eeba-daee-444e-8b3d-2d302f7e7aff DOI https://doi.org/10.1016/j.egyr.2024.03.045 ISSN 2352-4847 Source Energy Reports, 11, 3740-3755 Part of collection Institutional Repository Document type journal article Rights © 2024 F. Dehghan Marvasti, Ahmad Mirzaei, Mehdi Savaghebi, A. Lekić, M. Popov Files PDF 1-s2.0-S2352484724001902-main.pdf 12.81 MB Close viewer /islandora/object/uuid:8ce9eeba-daee-444e-8b3d-2d302f7e7aff/datastream/OBJ/view