Method for operating a wind turbine connected to a power grid as well as wind turbine suitable for carrying out the method

摘要

The present invention relates to a method for operating a wind turbine connected to a power grid for generating electrical energy when a change in grid voltage occurs, as well as a wind turbine for performing the method. According to the method, if a grid voltage deviates from a certain normal grid voltage range, the current residual grid voltage is measured, the current wind speed is measured, depending on the value of the residual grid voltage, a specific period of time beginning with the detection of the grid voltage change is defined, and the wind turbine is set within the defined period of time depending on the value of the remaining mains voltage with a certain operating mode that deviates from normal operation in terms of active power and the wind turbine is operated again in normal operating mode from normalization of the mains voltage within the defined period of time or if the mains voltage deviation persists during the defined period of time is switched off at the end of the period. According to the invention, voltage ranges are defined for network voltage values that are not included in the normal network voltage range, with each defined voltage range being assigned a plurality of voltage values and in each case at least one first factor that is different for each voltage range for controlling the wind turbine to implement the operating mode that differs from the normal operating mode and depending on of the ...