PITCH ANGLE CONTROL OF VARIABLE SPEED WIND TURBINE SYSTEM WITH DOUBLY FED INDUCTION GENERATOR

Abstract

Abstract: The ever increasing demand and interest in developing green energy worldwide has led to the progress of hybrid energy system. Many hybrid energy systems include wind systems owing to the availability and easy access of wind resource. In current years, renewable energy has become one of the most important and promising sources of energy generation, which demands supplementary transmission capacity and better resources of maintaining system reliability. The growth of technology related to wind systems industry leaded to the growth of variable speed wind turbines that present many advantages compared to the fixed speed wind turbines. These wind energy conversion systems are connected to the grid through Voltage Source Converters (VSC) to make variable speed operation possible. The system under consideration is a variable speed wind generation system based on Doubly Fed Induction Generator (DFIG). The rotor side converter (RSC) usually provides active and reactive power control of the machine while the grid-side converter (GSC) keeps the voltage of the DC-link constant. The additional freedom of reactive power generation by the GSC is usually not used due to the fact that it is more preferable to do so using the RSC. This paper deals with the introduction of Doubly fed induction generator, AC/DC/AC converter control and finally the SIMULINK/MATLAB simulation for isolated Induction generator as well as for grid connected Doubly Fed Induction Generator and corresponding results and waveforms are displayed.