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- W2981942810 abstract "Wind energy has recently come to constitute more than 10% of the electric power consumed in the EU. As the wind industry is rapidly growing, wind turbines grow larger and new models are soon expected to reach ratings of 10 MW. The development of offshore wind farms is another major trend in the industry. Offshore farms are particularly suitable for installation of large turbines, able to utilize the stronger winds available. However, in case of an offshore failure, it could require weeks to access and repair the turbine. Even in onshore farms, the turbine size cannot allow frequent disconnections. In this context, increasing turbine availability emerges as a critical issue: Modularity is seen as a promising approach to respond to this need. Modular systems can be decomposed into a number of independent 'modules' or components. Such systems can have their faulted modules bypassed and continue operation after fault, increasing system availability. Less frequent and easier repair can also achieved. Different levels of modularity have been proposed: Systems with modular converters or systems with modularity both in the converter and machine, with possible levels of modularity in the machine itself. Focusing on the machine-side of modularity, this thesis aims to produce a comparative study of the main modular machine topologies proposed in literature. The first step to address this problem, is to propose some promising machine topologies, suitable for modular design. Subsequently, a 2-D analytical model is developed, able to account for different types of winding. The model calculates important quantities to evaluate electromechanical performance (Back-EMF, Power, cogging torque) and efficiency (iron loss, copper loss). Analytical modelling results are validated by means of FEM modelling. The validated analytical model is then used to carry a first level comparison of numerous modular winding machines. The designs which perform best in terms energy yield, efficiency and cost are promoted for a second level comparison, where further modularity is introduced. This time, the machine stator is segmented and different segmentation ideas are applied. The segmented designs are compared by means of FEM. After the optimal design is selected, the flux gaps introduced in the stator core are considered, and the influence of gap width on the machine performance is investigated." @default.
- W2981942810 created "2019-11-01" @default.
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- W2981942810 date "2016-01-01" @default.
- W2981942810 modified "2023-09-27" @default.
- W2981942810 title "Modeling and topology investigation of modular machines for wind generator systems" @default.
- W2981942810 hasPublicationYear "2016" @default.
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