This paper mainly deals with a case study about the design of speed control of horizontal axis wind turbine using a programmable logic controller which is interfaced with an ultrasonic anemometer. The ultrasonic anemometer is capable of monitoring both speed and direction and the programmable logic controller can be used to control the speed and direction of rotation of blades. Its main advantage is that using the ultrasonic technique it has no moving parts, allowing for the utilization in a variety of applications requiring low maintenance and fast response to rapid wind gusts. The proposed system presents a simple idea representing a design for controlling the speed of blades whenever the blades rotate beyond the survival speed and also for changing the direction of the blades according to the directional change of wind.

Keywords : Wind Energy; Ultrasonic Anemometer; Wind Speed and Direction Measurement Of Wind Blades; Programmable Logic Controller.