Question

A 3 phase alternator derived by wind Turbine is designed to generate a maximum of 400kw at wind speed of 15 m/s. The internal generated voltage of the alternator at rated rotor speed is Eo= 480 v/phase, and the synchronous reactance of the alternator is 1.0 ohm. The output of the alternator is connected to an infinite busbar of 420 v/phase through transmission lines that have reactance of 10 ohm per phase. Draw the per phase equivalent circuit of the system and answer the following requirements. a) find the torque and angle S that permits the transfer of the maximum power to the infinite busbar. b) Calculate the terminal voltage of the alternator E c) calculate the reactive power transferred to the infinite busbar d) if a capacitor bank system is connected to the transmission line to fully compensate for the voltage drop in the transmission lines, find the capacitive reactance required. e) if the wind speed is suddenly changed to 11 m/s, assume constant speed operation of the alternator find the new torque angle for maximum generated power transfer

Answer 1