Browsing by Keyword "ROCOV"
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Item Fault detection based on ROCOV in a multi-terminal HVDC grid(European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ), 2020) Perez-Molina, M.J.; Eguia-Lopez, P.; Larruskain-Eskobal, M.; Etxegarai-Madina, A.; Apiñaniz Apiñaniz, S.Protection of a meshed VSC-HVDC grid is a challenge due to the behaviour of DC current and voltage signals during fault conditions. Protection systems must operate in a very short time range. Since fault detection should be very fast, local measurement based algorithms are mostly used; communication based algorithms lack the needed speed as a result of the communication time delay. This way, a ROCOV algorithm is proposed in this paper. This algorithm is analysed for different fault conditions.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.