across its output terminals 24 26 as a cubic function of the rotational speed of the generator 22 in as much as the generator 22 is directly coupled to the wind turbine the rotational speed of the turbine and generator is directly proportional to the wind speed as such the output voltage at the generator terminals 24 and 26 is a cubic function of the wind speed the output terminals 24 26 of the generator 22 are coupled to an inverter shown within the block 28 the inverter 28 converts the dc output voltage available at the output terminals 24 26 of the generator 22 to an ac voltage suitable for connection to a utility ac power grid generally identified with the reference numeral 30 the ac power grid 30 may be a phase to phase 230 240 volts ac suitable for residential commercial and industrial application in the exemplary embodiment shown shown the inverter 28 generates a phase to phase voltage across two output phases l 1 and l 2 for example 230 240 volts ac depending on the configuration of the utility ac power grid 30 the inverter 28 may also include a ground conductor for use with utility ac power grids which are 230 240 volts ac with a center tap ground for providing 230 240 volts ac phase to phase and 115 120 volts ac phase to ground in such a system the inverter ground conductor.