METHOD AND ARRANGEMENT FOR DETERMINING THE ELECTRICAL PROPERTIES OF A WIND TURBINE

摘要

The invention relates to a method for determining the electrical properties of a wind turbine (14, 15), wherein the wind turbine (14, 15) is configured to feed electric current into a connection grid (16) via a power circuit (23, 24, 25, 29). In the method, a complex-frequency-dependent current measurement (26) is performed in an active state of the wind turbine (14, 15) in which the wind turbine (14, 15) feeds electric current into the connection grid (16) via the power circuit (23, 24, 25, 29). A complex-frequency-dependent voltage measurement (28) is performed in a passive state of the wind turbine (14, 15) in which the wind turbine (14, 15) does not feed any electric current into the connection grid (16) via the power circuit (23, 24, 25 29). A grid preloading value is determined from the complex-frequency-dependent voltage measurement (28) and a complex-frequency-dependent impedance (Ztot) of the power circuit (23, 24, 25, 29) of the wind turbine (14, 15). A current characteristic value of the wind turbine (14, 15) is determined as the difference from the complex-frequency-dependent current measurement (26) and the grid preloading value. The invention furthermore relates to an arrangement for implementing the method. The invention makes it possible to separate the harmonics generated by the wind turbine (14, 15) from the harmonics originating from the connection grid (16).