In this paper, a gearless hydraulic wind energy harvesting and transfer system is mathematically modeled and verified by experimental results. The energy is harvested by a low speed-high torque wind turbine connected to a high displacement hydraulic pump, which is connected to hydraulic motors. The quality of transferred power from the wind turbine to the generator is important to maintaining the systems power balance, and frequency droop control in grid connected applications, and to ensure that the maximum output power is obtained. The gearless wind power transfer technology may replace the current energy harvesting system to reduce the cost of operation and increase the reliability of wind power generation.

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location of cell phone antennas and the high cost of grid expansion to remote areas provide economic incentives for development of green cell phone towers. At the height of 15-60 meter, these towers experience a semi steady flow of air suitable to generate electric power. However, some technical challenges and sizing procedures need to be addressed when powering up the sensitive telecommunication loads with intermittent wind power. This paper provides the proper sizing procedure for electrical components used in a wind powered green cellphone tower. In addition, a supervisory control unit is designed and used to provide a high performance power delivery to the tower's electric loads. A small-scale system is implemented with dSPACE hardware to experimentally demonstrate the performance of supervisory controller.