Wind power as a source of green and abundant energy has acquired a great momentum across the world and is proposed as one of the main new world power sources. In the last few decades, wind turbines with different generators have been developed to increase the maximum power capture, minimize the costs, and expand the use of the wind turbines in both onshore and offshore applications. This paper studies the development of different types of wind turbine generator technologies and discusses the advantages and disadvantages of each type. In addition, a comparison of different generator designs based on the technical data and market trends is provided. To better understand the development of generator concepts on the market, the market trends of current large generators with a capacity of 2.5 MW and above across the world are evaluated.

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