Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/78457
Title: Comparative analysis of bearing current in wind turbine generators
Authors: Liu, RF
Ma, X
Ren, XJ
Cao, JC
Niu, SX 
Issue Date: 2018
Source: Energies, May 2018, v. 11, no. 5, 1305
Abstract: Bearing current problems frequently appear in wind turbine systems, which cause wind turbines the break down and result in very large losses. This paper investigates and compares bearing current problems in three kinds of wind turbine generators, namely doubly-fed induction generator (DFIG), direct-drive permanent magnet synchronous generator (PMSG), and semi-direct-drive PMSG turbines. Common mode voltage (CMV) of converters is introduced firstly. Then stray capacitances of three kinds of generators are calculated and compared through the finite element method. The bearing current equivalent circuits are proposed and simulations of the bearing current are carried out. It is verified that the bearing currents of DFIGs are more serious than the two kinds of PMSG, while common mode current (CMC) of the direct-drive PMSG is much greater than the other two types of wind turbine generators.
Keywords: Bearing current
Common mode current
Doubly fed induction generators
Permanent magnet synchronous generators
Wind turbine generator
Publisher: Molecular Diversity Preservation International (MDPI)
Journal: Energies 
EISSN: 1996-1073
DOI: 10.3390/en11051305
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