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

Author:

Mei Zeting1ORCID,Li Guangjin1ORCID,Zhu Ziqiang1ORCID,Clark Richard2,Thomas Arwyn2,Azar Ziad2

Affiliation:

1. Electrical Machines & Drives Group, Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S10 2TN, UK

2. Siemens Gamesa Renewable Energy Limited, North Campus, Broad Lane, Sheffield S3 7HQ, UK

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.

Funder

UK Engineering and Physical Science Research Council (EPSRC) Partnership

Publisher

MDPI AG

Subject

Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction

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