Wind as a renewable source of energy & torque speed characteristics of a wind turbine driven induction generator

Abstract

The paper describes a variable speed wind generation system where the torque speed characteristics is carefully regulated to judge the performance of the wind turbine generator system.. A squirrel cage induction generator feeds the power to a double-sided pulse width modulated converter system which pumps power to a utility grid or can supply to an autonomous system. The generation system utilizes IGBT PWM rectifier which scores over other conventional generator converter schemes owing to its low conduction losses and higher impedance. It also lends the system a unity power factor operation and minimizes harmonic distortion in line and machine currents. The turbine characteristics and the torque speed characteristics have been studied in detail by simulation to validate the theoretical concepts established. The modeling of the asynchronous generator connected to the grid is also presented in this article. The uniform reference coordinate is adopted in the whole wind energy conversion system and the simplified model based on the multi-time scale theory is given after establishing the detailed model. In the end, the simulation results assure the validity of the simplified model.