Research on AC line distance relay in the presence of modular multilevel converter based HVDC


In the AC/DC hybrid system consisting MMC-HVDC, it needs the distance relay zone 2 or stage III of higher AC line action to remove fault when the protection for lower level AC line which is directly connected with the MMC-HVDC cannot correctly remove fault. The changes of MMC-HVDC operation mode will result that the scope of higher line distance relay zone… (More)

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