Q2 (a) Outline with the aid of a suitable diagram the necessary power conversion stages required to interface a small permanent magnet (PM) wind generator to a 3 phase AC grid. (b) Given the operating conditions for a stand alone star connected 3 phase synchronous generator outlined in Table Q2b construct a scaled phasor diagram and determine the resultant load current and power factor. On the same phasor diagram indicate the resultant changes when the load current increases by approximately 20% for no change in (lagging) power factor or excitation voltage. Value 415V Parameter Excitation Voltage Load Angle Xs 300V 20° 1.50 Table Q2b A star connected 3 phase wound field synchronous generator with a (c) synchronous reactance of 122 is connected to a 11kV (line) grid and supplies 1MW at 0.92 lagging power factor at its terminals. Calculate the phase current and resultant voltage across the synchronous reactance (Vxs), and from a scaled phasor diagram graphically determine the required excitation voltage (Eph) and load angle (8).