Minimization of Harmonics Due to Grid Connected Wind Energy System and Non-Linear Load
Renewable energy sources such as wind possess great potential because they are indigenous, nonpolluting, and inexhaustible. However, due to wind instability and rapid switching of wind turbine system, generated power from wind turbine when injected into grid power network creates harmonics and other forms of power instability characteristics. The International Electro-technical Commission (IEC) gives standard measurements and norms of harmonics of a grid connected wind turbine. In order to keep the power quality under limits specified by IEC-61400, a thorough study is needed to identify the harmonics and develop measures to mitigate them. In this paper, the wind pattern was anticipated using a suitable wind data. Modeling of a wind farm power system was presented for study. The topology of Flexible AC Transmission system component (STATCOM) was presented and connected with wind farm and simulated using MATLAB/SIMULINK. Using the Fast Fourier Transform (fft) approach, the total harmonics were determined for wind farm power without and with STATCOM connected together in the grid network. This STATCOM device injected a voltage into the grid network which compensated for reactive power demanded by the load and cancelled the harmonics due to non-linear load and rapid switching of the generator.