Abstract:
A system for a wind turbine comprises: one or more devices (12)(30) operatively mounted on a wind turbine (1) for generating an output signal during use; and a voltage source (22)(32) in electrical connection with the one or more devices (12)(30) for powering the one or more devices during use. The voltage source (22)(32) comprises at least one layer of a voltage generating material (24) in the form of a dielectric electroactive polymer capable of producing a voltage upon deformation. The at least one layer of voltage generating material is incorporated into a wind turbine component (5)(2) which is subject to deformation during operation of the wind turbine (1).