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Effective utilization of renewable energies such as wind energy is expected in place of the fossil fuel. The speed of wind is not remained constant and windmill output power is proportional to the cube of wind speed. In order to wind speed deviation, the output power of wind turbine generators (WTGs) is fluctuated. To reduce the fluctuation, different methods are already proposed such as energy storage devices, electric double layer capacitors, flywheels, and so on. These methods are effective but they require a significant extra cost to the system. This paper represents a method to generate smooth output power of a large WTG by using the inertia of WTG system. The inertia behaves like an inductor in an electrical circuit. It stores energy during acceleration and releases energy during deceleration. It can be utilized to generate smooth output power of a WTG. The additional energy storage system is not required. Additionally, the proposed method can be changed into the Maximum Power Point Tracking (MPPT) control method by adjusting an average time. The effectiveness of the proposed output power smoothing control is compared with MPPT control method and verified by using the MATLAB SEVIULINK environment.
Date of Conference: 10-13 Oct. 2010