Power generation system or wind power generation system

PROBLEM TO BE SOLVED: To provide a power generation system or a wind power generation system capable of easily replacing a component unit of an electric power converter while performing maintenance operation.SOLUTION: The power generation system includes: a power generation unit 2 which has a stator which has a stator wiring 7, a rotator 6 which has a rotator wiring 8 and is disposed at the inner diameter side of the stator 5 being interposed by a predetermined gap; an electric power converter 4 which is stored inside the rotator 6 being electrically connected to a rotator wiring 7; a base 18 which is disposed at the inner diameter side of the rotator 6 and at least a part of the electric power converter 4 is fixed thereto; and a support member 20 which is fixed inside the rotator 6 to support the base 18.SELECTED DRAWING: Figure 3