LIGHTNING PROTECTION DEVICE, DIRECT-DRIVE WIND TURBINE GENERATOR SYSTEM AND LIGHTNING PROTECTION METHOD THEREOF

摘要

A lightning protection device comprises a lightning receptor arranged on a nonmetal blade (1) for receiving the lightning current and a blade downlead (2) electrically connected to the lightning receptor; a first lightning current guide component (3) electrically connected with the blade downlead (2) and connected with the outer surface of a generator rotor (5) in an insulation manner; a second lightning current guide component (7) connected with the outer surface of the generator rotor and an insulated cabin cover (6) in an insulation manner, and electrically connected with the first lightning current guide component (3) by a metal conductor (9); a lightning protection downlead (11) for electrically connecting the second lightning current guide component (7) with a grounding component (15) arranged in a tower, so as to discharge the lightning current into the ground through the tower. A direct-drive wind turbine generator system and a lightning protection method thereof are also disclosed.