Variable Speed Wind Turbine with Doubly-Fed Induction Generator for a Regulated Output Frequency

Abstract

wind energy is one of the most important sources of renewable energy in the world. However, its main issue is that it's associated with dependence on the local environmental conditions, it's affected by wind speed, which causes oscillations in the output power of the generator, resulting in an unreliable system. Although using the fixed speed method leads to mechanical problems in case of turbine exposure to wind above the required level. Meanwhile, variable speed wind turbines were used with different types of generators depends on many causes. The doubly-fed induction (DFIG) generator is one of these generators. It's a wound rotor type induction generator it provides a variable speed system with fixed output power. This paper will be presenting the stand-alone performance of DFIG using variable frequency drive (VFD) to improve variable speed constant frequency (VSCF), it will be implementing the system practically and by MATLAB simulation.