Comparative Analysis of Bearing Current in Wind Turbine Generators

Ruifang Liu, Xin Ma, Xuejiao Ren, Junci Cao and Shuangxia Niu
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Ruifang Liu: School of Electrical Engineering, Beijing Jiaotong University, Haidian District, Beijing 100044, China
Xin Ma: School of Electrical Engineering, Beijing Jiaotong University, Haidian District, Beijing 100044, China
Xuejiao Ren: School of Electrical Engineering, Beijing Jiaotong University, Haidian District, Beijing 100044, China
Junci Cao: School of Electrical Engineering, Beijing Jiaotong University, Haidian District, Beijing 100044, China
Shuangxia Niu: Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China

Energies, 2018, vol. 11, issue 5, 1-13

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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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