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Ramp rate control and voltage regulation for grid directly connected wind turbines

This paper introduces a methodology to enhance the quality of the voltage and power produced from fixed-speed direct-connected wind turbines. The method uses an electrolyzer/fuel cell combination to be connected to the point of common coupling via limited rating converters. The control scheme is designed to keep the power ramp rate and voltage fluctuation within their limits and to minimize the rating of the converters used to interface the electrolyzer and the fuel cell. Intensive simulation results are carried out to demonstrate and validate the proposed technique.