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Frequency control by coordination control of wind turbine generator and battery using H∞ control

This paper presents a frequency control method by coordination control of a wind turbine generator (WTG) and a battery using H∞ control theory. The output command of the WTG is based on wind speed conditions and the output is controlled by pitch angle control system using H∞ controller. H∞ control is also used in the output command system of the battery which is determined according to the frequency deviation and the battery energy storage ratio. By using the proposed method, good frequency control performance, reduction of windmill blade stress and the rated capacity of battery are can be achieved simultaneously. The effectiveness of the proposed method is verified by using MATLAB®/SIMULINK®.