| Abstract |
Main shaft bearing is an important part of the wind turbine rotating system. But the bearing voltage, which is the voltage between the bearing and the main shaft, is the main reason for the downtime of the main shaft bearing. That is induced by the fast switching device of the converter and may cause bearing damage and electromagnetic interference (EMI) problems. Base on the practical test result of bearing current, common-mode voltage (CMV) of the converters is considered as the main source. In this paper, a circuit model is proposed to model the CMVtransmission path to the main shaft bearing. For further verification, a downsize wind turbine is built up in lab condition, different tests are launched to verify and improve the model. |
