<span>In the pursuit to increase the share of wind power in the global power matrix, the reduction of system, operability and maintenance costs are key factors to be improved through research and development. There is a trend to research and develop hydrostatic transmissions aiming to use them in wind turbines. This trend is set by research institutions and wind power companies around the world. Despite of fluid power transmissions with a pump and motor be a well developed technology, the application of them into wind turbines has a series of challenges. A few of them are: the system controllability, energetic efficiency and prove of concept fea-sibility. This thesis is about a prove of concept of a hydrostatic transmis-sion for wind turbines. This concept has the pump at the top of the nacelle and the hydraulic motor driving a synchronous generator at the ground level. The hydrostatic transmission concept is theoretically studied, hav-ing its behaviour and parameters described in terms of wind and turbine properties. An analysis of the transmission and synchronous generator open-loop stability is performed. A test bench, using off-the-shelve com-ponents, capable of generating electricity and to deliver it to the grid, is built to evaluate experimentally the proposed concept. A state machine structure for system control in all the different turbine operation regions is developed and implemented at the test bench. Inside each turbine oper-ation state there is a controller acting on the system to achieve the opera-tion region task. It is proposed a new structure to one of these controllers to increase the system performance.</span>

EXPERIMENTAL AND THEORETICAL ANALYSIS OF A HYDROSTATIC TRANSMISSION FOR WIND TURBINES PDF

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