Multi-use energy storage for renewable sources

A power generation system 40 having a wind turbine blade assembly 42, a generator 43 mechanically coupled to the blade assembly, and a power converter 44 coupled to the generator is provided. An energy storage device 54 and a bidirectional converter 56 coupling the energy storage device to the power converter are also provided in the system. An inertia controller 62 is provided for generating a first transient signal to regulate active power from the wind turbine system when a power grid signal is outside of a respective signal range. The system further includes an energy storage controller 60 for providing a second transient signal to the bidirectional converter 56 to regulate a power to or from the energy storage device 54 based upon the first transient signal, power generating system conditions or combinations thereof.