This paper propose an autonomous distributed vehicle-to-grid control scheme of grid-connected (plug-in hybrid) electric vehicle. Grid-friendly charge and discharge maintaining user convenience for plug-out and battery state-of-charge is realized based on frequency measurement at the plug-in terminal. Implementing proposed scheme to automotive power electronics circuit, (plug-in hybrid) electric vehicle works as a smart storage which is an alternative to stationary battery. The smart storage is expected to be a spinning reserve because of its high-speed response without information exchange to a central load dispatch center. An effect of the autonomous distributed vehicle-to-grid and cooperation with centralized speed governor control and load frequency control of conventional thermal power generator is evaluated.