Methods and systems for operating a power converter
AssigneeGeneral Electric Company
InventorsRobert Gregory Wagoner, David Smith
Life of this patent
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Abstract
A power conversion system for providing power to an electrical grid is described. The power conversion system includes a power converter coupled to a power source and the electrical grid. The power conversion system also includes a converter controller coupled to the power converter and configured to control operation of the power converter to actively cancel harmonic current received at the power converter from the electrical grid.
Claims20
A power conversion system for providing power to an electrical grid comprising:
- a power converter coupled to a power source and the electrical grid;
- and,
- a converter controller coupled to said power converter and configured to control operation of said power converter to actively cancel harmonic current received at said power converter from the electrical grid.
A power converter controller for controlling a power converter, said power converter controller comprising:
- an input configured to receive a grid current feedback signal, the grid current feedback signal comprising a grid current measurement including a plurality of harmonic current components;
- a control system comprising:
- a current regulator control loop configured to generate at least one voltage reference command, and
- a harmonic current reduction control loop configured to receive the grid current feedback signal and to generate at least one harmonic cancelation voltage command,
- wherein said control system is configured to combine the at least one voltage reference command and the at least one harmonic cancelation voltage command to generate at least one adjusted voltage reference command that when provided to the power converter creates a cancelation current that cancels at least one of the plurality of harmonic current components of the grid current;
- and,
- an output configured to provide the at least one adjusted voltage reference command to the power converter.
A method for reducing harmonic current transmitted from an electrical grid to a power conversion system that includes a power converter controller configured to control operation of a power converter, said method comprising:
- receiving, at the power converter controller, a grid current feedback signal;
- extracting at least one harmonic current component from the grid current feedback signal, the at least one harmonic current component corresponding to a selected harmonic;
- and,
- generating at least one harmonic cancelation voltage command based at least partially on the at least one harmonic current component.
Dependencies are inferred from the claim text.