Abstract A power conversion system for driving a load is provided. The power conversion system comprises 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. The system further comprises 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. Each power cell also has a single phase output connectable to the load. A power switching arrangement including at least one power switch is connected to the power cell input and a DC bus, and a switch controller is connected to the power switching arrangement and the power cell input. The power cell also has a PWM output stage having a plurality of PWM switches connected to the DC bus and the single phase output. A local modulation controller is connected to the PWM output stage. 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. The power conversion system also comprises 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 is connectable to the load to monitor power flow thereto.
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 wherein the switch controller and the local modulation controller of each of the at least one power cell are connectable to a master controller that is connectable to the load to monitor power flow thereto.
Claim 2
Dependent Claim
243 words
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 wherein the switch controller and the local modulation controller of each of the at least one power cell are connectable to a master controller that is connectable to the load to monitor power flow thereto.