Power smoothing of wind turbine generator using Fuzzy-PI pitch angle controller

Wind power is among the rapidly spreading renewable energy sources in the past years. It has been a trend that renewable energy sources including wind generators be either connected in the distribution level near the loads, or be operated in islanded operation. However, since wind generators are highly dependent on wind speed which changes throughout the day, wind output of wind power plants are highly expected to fluctuate. This paper proposes a pitch angle control method using Fuzzy logic and PI controllers for a wind power plant. The pitch angle control is designed to work with conventional PI controller to vary its parameters to smoothen the wind turbine output in cases of varying wind speeds. The effectiveness of the proposed control method is demonstrated through simulation in Matlab/Simulink environment.