1. Cage Induction Generator. Part A The classical 'Danish Concept' describes a wind turbine consisting of a stall-controlled rotor with three rotor blades, a gearbox, a pole-switched asynchronous generator with squirrel cage rotor and a direct mains grid coupling. In order to limit the inrush currents that are produced when the generator is coupled with the grid, soft-starters are used between the generator and the grid during the starting period. Explain the operation of the above scheme with the aid of diagrams, equivalent circuits and equations. (60 marks)

Fig: 1