SYSTEMS AND METHODS TO OPTIMIZE ACTIVE CURRENT SHARING OF PARALLEL POWER CONVERTERS

摘要

Provided is an approach for active control of cross currents flowing among multiple paralleled converters. Control of cross currents is achieved by using at least one proportional-integral (PI) controller and at least one resonant controller to target several selected dominant harmonics with infinite gains to ensure elimination of targeted harmonic cross currents in steady state. The cross currents are decomposed by into (1) common mode and differential mode components or (2) current phase domain components and each component is suppressed to a value approximately near zero using the controller. Also provided is a device comprises instructions, that, when executed by a processor, cause the processor to perform operations, which regulate and suppress cross current within a power system.

主权项

1. A method for regulating cross-current flow within a power converter system comprising:
measuring, by a controller comprising a proportional control, an integral control, and at least one resonator control, an existing amount of cross current within each of a plurality of converters within the power converter system; summing, by the controller, the existing amount of cross current within each of a plurality of converters to create a summed cross current; applying, by the controller, a selective current control within the plurality of converters to suppress a common mode component, a first differential mode component, and a second differential mode component within the summed crossed current; calculating, within one of the plurality of converters, the common mode component of the summed cross current formed by summing a current first current from a first phase of a converter, a second current from a second phase of the converter, and a third current from a third phase of the converter; and wherein the common mode component within each of a plurality of dominant harmonics within the one of the plurality of converters is suppressed to a value approximately near zero using the controller.