Maximum Power Extraction in Grid Connected DFIG Using 3 Level Diode Clamped Inverter

Abstract: Wind energy is one of the most dependable renewable source of energy in modern era where the exploitation of the fossil fuel is more. The Double Fed Induction Generators are used to obtain maximum output from the wind turbine at any wind speed change. In a Doubly Fed Induction Generator (DFIG), the stator is directly connected to the AC mains, while the wound rotor is fed from a back-to-back converter via slip rings to allow the DIFG to operate at a variety of speeds in order to accommodate changing wind speeds. Here we have used a method to maximize the output power of the wind energy system that is by use of the 3-Level Diode Clamped Inverter circuit that generates output in the stepped form. The 3-Level Diode Clamped Inverter circuit includes capacitor, diode and a switch that can be an IGBT, transistor or MOSFET. Following are the features of the Multilevel Invertor Circuit:- that reduces the stress on the bearings of turbine. ? Reduces harmonics. ? they can operate at lower switching frequency. ? they can draw input current having low distortion. ? Generate output with low distortion ? Generates a COMMON-MODE VOLTAGE. Keywords: DFIG, PWM, Multilevel Inverter, Wind Turbines, Global Warming, Greenhouse effect.