Large wind turbine generators: State-of-the-art review

This paper presents a broad overview of wind energy conversion generators in muti-megawatts wind turbines. Both technological and economic advantages and drawbacks of each generator system technology (geared and gearless) are detailed. Moreover, comparison based on weight, diameter, cost, energy yield and axial length between different electrical generators is discussed. This comparison helps us to find the suitable structure of generator system for high-power wind turbines. Additionally, recent developments on generators are introduced including some examples of their implementation in ultra-large operational wind turbines. Finally, this review could help to understand the potential future choices in the design of wind turbine energy conversion systems.