A battery storage and/or a wind turbine including the battery storage. A generator for generation of an electric current. An electric flow path configured for conducting the electric current to an electric grid via a power converter, the power converter. The battery storage electrically connected to the electric flow path, the battery storage comprising a plurality of battery cells, each battery cell comprising at least one battery element and at least two semiconductor switches. A controller is configured for selectively controlling the voltage over the battery storage by controlling the status of the at least two semiconductor switches of a plurality of the battery cells, and thereby whether a current path through the battery storage is bypassing the at least one battery element or passing through the at least one battery element of one or more of the plurality of battery cells.

A method for controlling a wind turbine having a plurality of actuators includes receiving operational data of the wind turbine and determining an operational state thereof. The method also includes using a control model to predict potential operational states depending on operation of the actuators over a finite period of time. The control model includes an aeroelastic model to determine loads based on the operational data. The control model further includes a strength calculation module to calculate secondary load parameters from the loads, constraints being defined for the secondary load parameters. The method further includes optimizing a cost function over an optimization period of time, subject to the constraints, to determine an optimum trajectory comprising commands for the actuators. The method further includes using the first commands of the optimum trajectory to control the actuators.