The Study Of Variable Velocity Constant Frequency System Of Wind Electric Power Generations

In this article the up to date new type generator applied in wind electric power generation is introduced all-round and we also analyzed its operational principle when leading a variable velocity constant frequency operation.Firstly, after introducing studying situations of BDFM in the world, its structures, principles, operational conditions and characteristics of several operational cases have been analyzed.Secondly, the theory of reference frame transformations is applied to transform the dynamic mathematical model to a d-q-0 rotating reference frame system, and the dynamic performance of the BDFM is simulated by the computer.Lastly, we have solved the problem of being not able to control coupling of active power and reactive power of BDFM independently by using the vector control and at the same time we provided a control equation with concise form and project easy to achieve.