Performance Comparison of Large-Scale Design-Optimized Non-Overlap and Overlap Winding Wound Rotor Synchronous Generators

• Published in: IEEE transactions on industry applications Vol. 59; no. 1; pp. 759 - 766
• Main Authors: Garner, Karen S., Kamper, Maarten J.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-01-2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Coils (windings); Design optimisation; Design optimization; electric machines; finite element analysis; generators; Harmonic analysis; Higher harmonics; Optimization; rotating machines; Rotors; Stator windings; Stators; Synchronous machines; Torque; wind energy generation; Winding; Windings
• ISSN: 0093-9994; 1939-9367
• DOI: 10.1109/TIA.2022.3209618

The use of non-overlap windings rather than overlap windings is a topic for debate. Non-overlap windings are generally cheaper and easier to manufacture but result in a high amount of magnetomotive force sub- and higher-order harmonics. A strategy to reduce these harmonics has been previously published and this study aims to provide a performance comparison of a large-scale wound rotor synchronous generator with a modified non-overlap winding and a classical overlap winding. Hence, design optimisations of a 16/18 and 16/72 pole/slot grid-connected 3 MW wound rotor synchronous generator for medium-speed wind generation are conducted. The optimisations are performed using the modified method of feasible direction gradient-based optimisation because of its simplicity and fast results. Optimal solutions for the 16/18 and 16/72 3 MW models are obtained and the performance of the solutions compared. The results show that the 3 MW 16/18 model performs favourably against the 3 MW 16/72 model, especially regarding the lower active mass.