Performance Comparison of Large-scale Design-optimised Non-overlap and Overlap Winding Wound Rotor Synchronous Generators

Garner, Karen S.; Kamper, Maarten J.

doi:10.1109/ecce47101.2021.9595003

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…The machines intended for the design optimisation are the three-phase 10 rotor poles/12 stator slots (10/12) WF-FSM design and the 16 poles/18 slots (16/18) WRSM, previously conceptualised and analysed in [12], [16], [22], [23] and [24]. A cross-sectional layout of each of the proposed machines and wind generator drivetrain are shown in Figures 1 and 2, respectively.…”

Section: Theoretical Design and Optimisationmentioning

confidence: 99%

Optimization and Performance Evaluation of Non-Overlap Wound-Field Converter-Fed and Direct-Grid Wind Generators

2022

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Non-overlap winding technology continues to remain relevant in the design of wound-field machines as an alternative for high torque density permanent magnet machines. In this paper, the finite element analyses-optimisation of two variants of the non-overlap wound-field machines viz., wound-field flux switching machine (WF-FSM) and phase shifting wound rotor synchronous machine (WRSM), are compared, first in terms of their performance for large-scale converter-fed wind generator drives, then experimentally as sub-scaled converter-fed versus direct grid-connected wind generators, respectively. This study is unique because there are no prior attempts to design, optimize and analyse on these machines for medium-speed wind power generation, as well as experiment on sub-scale prototypes for direct-grid and converter-fed operation. All investigations are contemplated in the medium-speed wind generator drivetrain which provides a tradeoff for generator efficiency and size. From the global optimisation of both machines at large-scale power levels, the torque per mass of the WF-FSM is found to be 50 % lesser compared to the WRSM. This is due to approximate volume, with closely matched optimal split and aspect ratios. In terms of the sub-scaled experimentation, both generators can easily vary their generated output power to match with varying wind resource, but direct grid-connected WRSM generator yields better efficiency performance compared to the WF-FSM converter-fed operating mode, given that the generator terminal voltage of the former is highly regulated.INDEX TERMS converter-fed, direct grid-connected, finite element analyses, non-overlap winding, optimisation, medium-speed wind generators, wound-field flux switching machine (WF-FSM), wound rotor synchronous machine (WRSM).

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