Vestas Wind Systems A/s

Siemens Gamesa Renewable Energy A/s

Bo Yin

Robert John Nelson

Per Egedal

Kouroush Nayebi

Gert Karmisholt Andersen

Torsten Lund

Björn Andresen

Heng Deng

Michael Stoettrup

Manoj Gupta

The invention relates to wind turbines, particularly to controlling reactive power exchange between a power grid and a wind power plant. The wind power plant has a plurality of wind turbine generators each having a corresponding power converter with a converter controller. Further, the wind power plant has a power plant transformer with an on load tap changer coupled between the wind power plant and the power grid. The power plant controller is regulating the on load tap changer and is generating reactive component setpoints for the wind turbine generators, when determining a need for production of short-term reactive power due to a sudden change in reactive power measured at the point of common coupling.

Method for controlling reactive power exchange between a power grid and a wind power plant

Provided is a method of damping mechanical oscillations of plural wind turbines of a wind park commonly supplying electric energy to a grid, the method including: determining, for each of the plural wind turbines, a damping control signal for counteracting an oscillation of the respective wind turbine; supplying at least a subset of or a subset of modified versions of the damping control signals to respective wind turbines such that a sum of the supplied damping control signals is lower than a threshold.

Damping mechanical oscillations of a wind turbine

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Ikast, Denmark

Bo Yin