公开(公告)号：WO2022063378A1

公开(公告)日：2022-03-31

申请号：PCT/DK2021/050298

申请日：2021-09-24

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： ANDREASEN, Marcin Blazniak ,  PEDERSEN, Kristian Bonderup ,  OLESEN, Anders Christian

IPC: F03D80/60 ,  H05K7/20 ,  H02M1/32

Abstract: An electric power converter system with an electric power converter, e.g. an AC-DC converter, a DC-AC converter or both. The electric power converter is air cooled by a cooling system having a fluid flow system arranged to force air or liquid through a primary flow path of a heat exchanger. An internal air flow with a fan serves to force air in a loop through a secondary flow path of the heat exchanger and the electric power converter to cool the electric power converter. A controllable bypass inlet opening mechanism provides a controllable opening to allow an inlet of ambient air into the internal air flow, and a control system receives at least one input parameter and being arranged to control the controllable bypass inlet opening mechanism accordingly. A bypass outlet opening, such as having a controllable bypass outlet opening mechanism, is arranged to provide an opening to allow an outlet of air from the internal air flow. The control system is preferably arranged to control the controllable bypass inlet opening mechanism accordingly to at least a temperature sensor sensing a temperature in the internal air flow at a position upstream of the electric power converter. Further, the controllable bypass inlet opening mechanism may be controlled also in response to a sensed humidity in the internal air flow, and a measure of electric power generated by the electric generator.