Browsing by Author "Abarrategi, O."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item ROCOV scheme for Fault Detection and Location in HVDC sytems(2019-07) Díaz, J.; Abarrategi, O.; Larruskain, D.M.; Perez-Basante, A.; Rubio, A.; POWER ELECTRONICS AND SYSTEM EQUIPMENTA 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.Item Superconducting circuit breaker concepts for the protection of HVDC systems(Institution of Engineering and Technology, 2019) Larruskain, D. M.; Etxegarai, A.; Iturregi, A.; Abarrategi, O.; Apiñaniz, S.; POWER ELECTRONICS AND SYSTEM EQUIPMENTThe reliable protection of DC grids is still a challenge, mainly because of the fast operation required for interrupting the high current faults that could severely damage the system. Accordingly, HVDC circuit breakers must be further developed. On the other hand, superconducting fault current limiters reduce fault currents and are able to adapt the performance of the system to the maximum breaking capacity of circuit breakers. In the present paper, a superconducting DC circuit breaker is proposed considering three circuit breaker technologies. Those technologies are compared and their performance is analysed on a multiterminal HVDC system. The paper highlights the benefits that the superconducting fault current limiter provides to the circuit breaker operation.