Research Of The Electromagnetic Design For A High-voltage Double-fed Induction Generator

High-voltage double-fed induction generator is a new type of wind turbine generator.It has the similar rotor structure as a traditional double-fed induction generator, using concentric high-voltage XLPE cables as its stator windings. High voltage can be outputted by the novel structure. However, the stator structure of a High-voltage double-fed induction generator is different from classical generator greatly because high-voltage XLPE cables are used as stator winding directly.It is necessary to research electromagnetic design of a high-voltage double-fed induction generator.The development background of high-voltage generator and its research status are introduced firstly, based on which the significance for the study on high-voltage double-fed induction generator is analyzed.Then, the determination methods of primary dimensions in design process of high-voltage double-fed induction generator is researched based on the existing structure of classical generator, in which the mechanical properties and electrical properties of high-voltage XLPE cables are considered comprehensively,using which the primary dimensions of a 1.5MW high-voltage doubly-fed induction generator are calculated.And, based on the electromagnetism design process of traditional generator,using the methods proposed in this paper for determinations of primary dimensions,the electromagnetic design of a high-voltage doubly-fed generator is carried out.Finally, the 2D electromagnetic field model of a high-voltage double-fed induction generator is established in this paper. The model is analyzed by using finite element method. The electromagnetic field distribution of a high-voltage double-fed induction generator under no load operation and rated operation are obtained.