Influence of Wind Turbine Pitch Angle on DFIG Output Stability under Load Changes

Wind power plants have several advantages compared to other types of renewable energy generation, such as wind energy sources that can be available during the day and night, the power that can be produced by wind power plants is greater. These advantages make many countries prefer to use wind power plants as the main electricity generation compared to other renewable energies. However, it is also necessary to know how the wind power plant can respond to changes in load. The load always changes every hour according to the consumption of electricity by consumers. Therefore, this paper aims to analyze the stability of the wind power plant against changes in load. The type of wind power plant used in this paper is the Double Fed Induction Generator (DFIG). The parameter that is used as input to maintain the stability of the wind power plant is the pitch angle of the wind turbine. The pitch angles used are 0, 10, 20, and 30 degrees. Furthermore, to determine the stability response of the wind power plant parameter output, it is necessary to test it with changes in load. The change in load in question is the addition of a load when the wind power plant is operating. The wind power plant output parameters analyzed include current, active power, induction generator rotation speed, and voltage. The simulation results on the output voltage side, the greater the pitch angle, the greater the peak voltage increase, and vice versa. On the side of current, active power and rotor rotation speed, the smaller the pitch angle, the less wave disturbance fluctuations and the faster the DFIG reach its stable condition for the output parameters, and vice versa. From these relationships, it can be concluded that a pitch angle of ° degrees has a more stable output and can make DFIG more responsive to reach its normal condition when there is a disturbance that enters the electric power system.