Modelling and Analysis of Inter-Turn Short-Circuit Faults for Large-Power SPM Wind Generators

Zeting Mei, Guangjin Li (), Ziqiang Zhu, Richard Clark, Arwyn Thomas and Ziad Azar
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Zeting Mei: Electrical Machines & Drives Group, Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S10 2TN, UK
Guangjin Li: Electrical Machines & Drives Group, Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S10 2TN, UK
Ziqiang Zhu: Electrical Machines & Drives Group, Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S10 2TN, UK
Richard Clark: Siemens Gamesa Renewable Energy Limited, North Campus, Broad Lane, Sheffield S3 7HQ, UK
Arwyn Thomas: Siemens Gamesa Renewable Energy Limited, North Campus, Broad Lane, Sheffield S3 7HQ, UK
Ziad Azar: Siemens Gamesa Renewable Energy Limited, North Campus, Broad Lane, Sheffield S3 7HQ, UK

Energies, 2023, vol. 16, issue 12, 1-15

Abstract: This paper proposes a general analytical model for large-power surface-mounted permanent magnet (SPM) wind generators under inter-turn short-circuit (ITSC) faults. In the model, branch currents rather than phase currents are used as state variables to describe the electromagnetic behavior of the faulty machine. In addition, it is found that the multiphase Clarke transformation can be used to simplify the proposed fault model with the inductances calculated analytically or numerically using finite element analysis. With the latter, both linear and nonlinear inductances can be obtained, and the non-linear inductances are used for the fault modelling of large power rating machines due to larger electrical loading and heavier magnetic saturation. With the developed fault model, studies of scaling effects (different power ratings such as 3 kW, 500 kW and 3 MW) and the influence of fault location on the electromagnetic performance of SPM generators with series-parallel coil connections have been carried out. The simulation results show that large-power SPM wind generators are vulnerable to ITSC faults when a relatively small number of turns are short-circuited and a single-turn short-circuit fault at the top of the slot is found to be the worst case.

Keywords: inter-turn short circuit; multiphase Clarke transformation; series-parallel coil connections; SPM wind generators (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: 2023
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