The evolvement of wind turbine power levels lead to an interest in investigat- ing new physical conversion stage ar- rangements. One appealing distribu- tion is moving the network decoupling back-to-back converter from nacelle to the tower base. This results in 100-200 m long cables between the generator in the nacelle and converter at ground level.
The motivation is to investigate resul- tant reflection effects due to long ca- bles at the cable junctions in nacelle and tower base.
To investigate the cables impact, a low voltage setup emulates the above WTG topology and serves as a down- scaled validation study. A circuit sim- ulation of generator, cables and ac- tive rectifier is modeled in reflecting the experimental setup. Generator and cable components are parameter- ized by impedance fitting to the imple- mented model. Based on the valida- tion, medium voltage simulation gives further insight for an expected appli- cation.
This gives the ability to assess the fea- sibility of a dV/dt filter. With the overvoltages suppressed, the genera- tor is protected from harmful winding stresses.