Design and Simulation of Wind Energy Conversion System Synchronized with Electrical Grid Using DFIG

Abstract

The aim of this paper is to show the modeling design and simulation of wind energy conversion system driven by doubly-fed induction generator that feeds ac power directly to the electrical grid. Doubly Fed Induction Generator (DFIG) is the basis on which the variable speed wind generation system works. The doubly fed Induction generator has its stator directly connected to the electrical grid. While DFIG has the rotor connected to the grid with the help of back-to back power converters which will reduce the harmonics that arises in the system voltage or current using the sinusoidal PWM technique. The Voltage Source Converters (VSC) are used for connecting the wind energy systems to the grid so that the variable speed operation should be possible. Early detection and isolation of the fault is very important in this context thus the protections of the whole system have paid much attention. For the control purposes of the system basically two power converters Rotor side converter and Grid side converter are used, which are known as back to back converters. The GSC (grid side converter) controls the flow of power between the DC bus and the AC side also allows the system to operate in sub-synchronous and super synchronous operational modes. This conversion system model has been designed and simulated in the MATLAB Simulink in a manner that response can be studied for different type of grid connections.
DOI: 10.17762/ijritcc2321-8169.150705