Patent ID: 8355265

Claim:
A method of converting DC power in a fashion capable of bi-directional power flow, comprising inverter-based controlling of power for a DC-to-DC conversion system to: flux the primary of a three-phase isolation transformer to create a three-phase rotating field from a source inverter supplied by DC, where the source inverter has an output; turn the source inverter output into three sinusoidal waves using an inductive filter; and regenerate using a regenerating secondary inverter and, by advancing and retarding the phase of the sine waves, controlling output current of the source inverter using the secondary inverter; wherein the regenerating is controlled by a synchronizer that: when the inductive filter is at frequency, matches the secondary inverter voltage to the source inverter voltage; matches the secondary inverter frequency to the source inverter frequency; matches the secondary inverter phase to the source inverter phase; and clamps the current limit of the secondary inverter, electrically connects the secondary inverter output to the source inverter output, and scales the current commanded of the secondary inverter to the command requested by a site controller.