Patent ID: 11929638
Assignee: VESTAS WIND SYSTEMS A/S
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F  Y | IPC F  H

Claim 9:
10. A power backup system for a wind turbine comprising:
an internal power supply grid for distributing power to a number of power consuming units of the wind turbine, the power backup system being adapted to supply power to the internal power supply grid during a grid fault; and
a power storage module comprising a plurality of series connected power storage units that provide a total backup voltage to the internal power supply grid during the grid fault, wherein the total backup voltage falls within a nominal voltage range of the internal power supply grid, and wherein a voltage level of the total backup voltage from the plurality of series connected power storage units is unmodified when provided by the power backup system to the internal power supply grid of the wind.