Problem 3: (25 points) The parameters of a DFIG are given be…

Questions

Prоblem 3: (25 pоints) The pаrаmeters оf а DFIG are given below. The stator is connected to a three-phase grid at 600 V RMS (line-line) and 60 Hz. At a given wind velocity the rotor is required to rotate at a speed (mech) of 1080 RPM to capture wind power of 0.7 MW at this wind velocity. The stator reactive power needs to be controlled to zero. You may neglect all losses except the losses in the rotor resistance. The turns-ratio between the stator and rotor windings can be assumed to be 1:1. Assume grid voltage orientation where the d axis is aligned to the grid voltage space vector. Neglect stator resistance and stator leakage inductance. Rotor resistance, Rr: ; Rotor leakage inductance, Llr: 0.1 mH; Magnetizing inductance, Lm: 1.5 mH; Number of poles, p: 6 For the given operating conditions in steady state, (a) Calculate the slip s and the frequency of rotor currents (b) Calculate the stator power and the power processed by the rotor side converter (b) Calculate the values of currents (c) Calculate the flux linkages (d) Calculate required rotor voltages,

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