In recent trends, wind energy takes a major role in production of electricity using Renewable energy source. We all know that wind energy is not a constant source of energy. Wind energy is nothing but the potential difference produced due to the heating of the earth’s surface and climatic changes.
Thus the kinetic energy of the wind also varies with respect to the climatic changes and temperature. Hence the power generated using wind energy is also not constant.
To convert the kinetic energy to electrical energy, we use Wind Turbine Generators (WTG). The principle behind the WTG is to convert the kinetic energy into mechanical energy and to the electrical energy.
Most of the WTG uses Induction Generator to convert kinetic energy of the wind to electrical energy. These generators produce output with high frequency fluctuation which cannot be integrated to the grid. Here comes the role of the converter which stabilizes the variable frequency to the fixed frequency that can be integrated to the grid.
Generally, power is ejected from the stator of the generator. In Double Fed Induction Generator, the power is ejected from both stator and rotor of the converter. Frequency of power from stator is close to the grid whereas the frequency of power from the rotor is abnormal and cannot be directly fed into the grid. Thus the power from the rotor is connect to the converter which stabilizes the frequency before it interface with the grid.