Modelling and simulation of stand-alone self-excited induction generator for wind power application

Abstract

Wind energy is one of the most important and promising source of renewable energy all over the world. Throughout the globe in last three or four decades generation of electricity from wind energy has created a wide interest. At the same time there has been a rapid development of wind energy related technology. The control and estimation of wind energy conversion system constitute a vast subject and are more complex than those of dc drives. Induction generators are widely preferable in wind farms because of its brushless construction, robustness, low maintenance requirements and self-protection against short circuits. However poor voltage regulation and low power factor are its weaknesses. This thesis covers the analysis, dynamic modelling and control of an isolated self-excited induction generator (SEIG) driven by a variable speed prime mover. The proposed dynamic model consists of induction generator, self-excitation capacitance and load model which are expressed in stationary d-q reference frame. The dynamic performance of SEIG is investigated under no load, with load and perturbation of load. To predict the performance of the purposed system, a MATLAB/ SIMULINK based simulation study was carried out. Viability of the excitation process is ascertained through experimental results obtained from the laboratory prototype machine. It also includes Dynamic analysis of voltage controller for SEIG using current control voltage source inverter (CC-VSI).