NOVELTY - The system (200) has an auxiliary load bus (202) to receive electric power having a voltage within a first voltage tolerance range. An electric power supply conduit (212) is coupled to an electric power source (116), to transmit electric power having a voltage within a second voltage tolerance range greater than first voltage range. A controlled series transformer (218) is coupled to auxiliary load bus and electric power supply conduit, to receive electric power having a voltage within second voltage range and to transmit electric power having a voltage within first voltage range.    USE - Auxiliary equipment system used for electric power generation device e.g. wind turbine generator of renewable energy generation facility (claimed). Can also be used in solar power generation systems, fuel cells, thermal power generators, geothermal generators, hydropower generators, diesel generators, and gasoline generators.    ADVANTAGE - The method can provide efficient and cost-effective operation of electric power generation assets. The renewable electric power generation facility facilitates transmitting electric power with a stable voltage within prescribed tolerance bands to auxiliary equipment. The auxiliary equipment system facilitates maintaining a stable voltage within a prescribed tolerance band for the electric power transmitted to auxiliary equipment during voltage transients induced by electric power grid disturbances. The auxiliary equipment system facilitates maintaining a stable voltage to auxiliary equipment during voltage transients induced by renewable generation transients. The auxiliary equipment system facilitates eliminating activities that include substituting, or replacing, such auxiliary support equipment with specialized equipment having broader electric power tolerances incurring exorbitant capital expenditures, and extended period of time. The system uses smaller and less expensive electronics with lower ratings, since only reactive power is injected and real power is not injected, in the event of a failure of the apparatus, the configuration facilitates continued operation of auxiliary equipment within the nominal voltage tolerance band.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a method of operating auxiliary equipment system for renewable electric power generation facility; and    (2) a renewable energy generation facility.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of auxiliary equipment system used with the wind turbine.    Electric power source (116)    Auxiliary equipment system (200)    Auxiliary load bus (202)    Pitch system (208)    Electric power supply conduit (212)    Controlled series transformer (218)