The first objective of this work is to quantify the head mass and tower mass savings that may be possible with this hydraulic electric generator concept. These savings will be computed under the assumption that the frequency response of the tower is maintained
to be constant so as to avoid problems with structural resonance and vibration caused by blade rotation. Secondly, this study will investigate the engineering feasibility of using this
hybrid generator concept in conjunction with compressed fluid energy storage inside the tower and quantify the time of energy storage. Thirdly, economic benefits will be estimated for the hybrid design both without and with an integrated energy storage system.
This is the first study to quantify both mass and cost savings associated with introduction of hybrid hydraulic-electric power generation. In addition, this is the first study to examine the characteristics and benefits of a compressed air energy system located within the tower volume and to quantify the potential storage capacity. This new CAES which employ hydraulic-electric power generation is shown to demonstrate unprecedented head mass
savings, allows the tower to have dual-use as energy storage, and can efficiently and economically levelize the wind power output to be steady or prescribed based on energy demands.