Browsing by Keyword "DC fault"
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Item Impact of a resistive superconductive fault current limiter in a multi-terminal HVDC grid(Institute of Electrical and Electronics Engineers Inc., 2018-06-08) Saldana, G.; Etxegarai, A.; Larruskain, D. M.; Iturregi, A.; Apinaniz, S.; POWER ELECTRONICS AND SYSTEM EQUIPMENTThe relevance of multi-terminal HVDC grids is expected to increase in next years. However, there are still several technical, economical and legal limitations that interfere with the construction of those multi-terminal links. One of the main technical obstacles is the handling of DC fault currents, because the interruption of DC currents in HVDC systems is nowadays a challenge. Among other proposals, the application of Superconducting Fault Current Limiters (SFCLs) combined with a mechanical Circuit Breaker (CB) solves technically that issue, according to the analysis and simulation results presented in this paper.Item ROCOV scheme for Fault Detection and Location in HVDC sytems(European Association for the Development of Renewable Energy, Environment and Power Quality, 2019-07) Díaz, J.; Abarrategi, O.; Larruskain, D.M.; Perez-Basante, A.; Rubio, A.A reliable DC fault protection system is essential for the development of HVDC grids. Therefore, this paper deals with the voltage derivative ROCOV scheme to locate and detect DC faults. The algorithm is able to differentiate internal and external faults considerably fast. The proposed algorithm is analyzed in a HVDC grid with different fault case scenarios. Finally, the ROCOV protection thresholds are discussed.