This report examines induction generator schemes used in wind turbines, focusing on Squirrel Cage Induction Generators (SCIG) and Doubly-Fed Induction Generators (DFIG). The report details the operational principles of SCIGs, including their connection to the grid, the use of soft starters, and equivalent circuits. It also explores self-excited induction generators (SEIGs) and their applications, including calculations for capacitance requirements. The report then delves into DFIGs, explaining their operation at both sub-synchronous and super-synchronous speeds, supported by power flow diagrams and relevant equations. The analysis covers the power flow, torque, and slip characteristics of both generator types, providing a comprehensive overview of their functionality and suitability for wind energy applications. The report references relevant literature to support the analysis and provides a detailed understanding of the advantages and limitations of each generator type.
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