Patent ID: 6847531

Claim:
A power conversion system comprising: a power transformer having at least one primary winding circuit and at least one secondary winding circuit, the primary winding circuit being electrically connectable to an AC power source; at least one power cell, each of the at least one power cell having a power cell input connected to a respective one of the at least one secondary winding circuit, a single phase output connectable to a load, a power switching arrangement including at least one power switch connected to the power cell input and a DC bus, a switch controller connected to the power switching arrangement and the power cell input, a PWM output stage having a plurality of PWM switches connected to the DC bus and the single phase output, and a local modulation controller connected to the PWM output stage, wherein the switch controller is adapted for monitoring and controlling a DC bus voltage according to a predetermined control methodology in both a motoring mode in which power from the AC power source is supplied to the load by the at least one power cell and a regeneration mode in which power from the load is supplied to the AC power source by the at least one power cell; and a master controller in communication with the switch controller and the local modulation controller of each of the at least one power cell, the master controller being connectable to the load to monitor power flow thereto.