6.1 Consider a wind microgrid given in Fig. 6.45. The system has a local load rated 100 kVA at a power factor rated 0.8 lagging. The three-phase transformer is rated 11 kV/0.44 kV; 300 kVA; X = 0.06 p.u. The induction generator is rated as 440 V, 60 Hz, three-phase, eight- pole; stator resistance of 0.08 2/phase; rotor referred resistance in the stator side of 0.07 2/phase, stator reactance of 0.2 2/phase; rotor referred reactance of X2 0.1 Q2/phase. Compute the following: i) The p.u equivalent model based on a kVA base of 300 kVA and 440 V ii) The shaft mechanical power if the shaft speed is at 1200 rpm iii) The amount of power injected into the local utility iv) The flow of reactive power between grid and local microgrid v) How much reactive power must be placed at the local grid to have unity power factor at the local power grid 11 KV (infinite bus) Load Transformer LV TL Gen Tm Figure 6.45 The Schematic of Problem 6.1.