REACTIVE POWER LIMIT OF VARIABLESPEED CONSTANTFREQUENCY WIND TURBINE

According to the working principle of variable-speed constant-frequency wind turbine, its steady state mathematical model is established in which the steady state performances of turbine, doubly-fed induction generator and its rotation speed control are condisered. On the basis of this model a method to calculate the reactive power limit of the variable speed and constant frequency wind turbine is put forward and the calculation and analysis for a variable-speed constant-frequency wind turbine are carried out, and the feasibility of the proposed method is varified.