Modelling of high frequency bearing voltage for dual-winding permanent magnet synchronous generators

Abstract

The modelling and analysis of high-frequency bearing voltage are of great significance to the assessment and mitigation of the electrical erosion risk in wind power systems. However, the dual-winding permanent magnet synchronous generator (DW-PMSG), as one of the mainstream models in wind power industry, has not been specifically analysed for its bearing voltage modelling method in the existing research. The high frequency common mode equivalent circuit model of DW-PMSG is established, and the effect of parasitic parameters between two sets of winding on bearing voltage is analysed. A model parameters extraction method based on differential evolution algorithm is proposed, and the range of parameters is estimated by finite element simulation and test results, which improves the search efficiency and solution accuracy. The accuracy of the proposed model is verified by the comparison of simulation and experimental results. On this basis, it is possible to conduct more in-depth research on the bearing voltage and bearing currents of DW-PMSG, and provide theoretical basis and simulation means for the design of suppression schemes.