Design of adjustable blade wind turbine for constant generated power

Wind turbines use the kinetic energy of the wind for generating the electricity by using ac generators. The generated electrical power is supplied to the grid. The produced energy mainly depends on the wind speed and the swept area of the turbine. As the wind speed increases accordingly the dimensions of the blades of wind turbine reduces. The blades are made auto adjustable with the help of stepper motor and control unit mounted on it. Various designing aspects are discussed while maintaining the generated power as 4.2kw. The wind turbine blades power and efficiency has been measured at different tip-speed-ratios and a maximum efficiency of 30% at 1.27 N/m³ air density. Present work gives an insight into the design aspects of a wind turbine, like turbine blade design, wind power and output power calculation. This paper presents an idea to maintain the generated power constant at variable wind speed by changing the blade dimensions.