System For Cancelling Fundamental Neutral Current On A Multi-Phase Power Distribution Grid

摘要

A system for cancelling fundamental neutral current on a multi-phase power distribution grid. The system includes a controller coupled to the power distribution grid responsive to a neutral current signal configured to determine a first corrective current based on at least the neutral current signal. A power module responsive to the controller is configured to generate the first corrective current. A transformer subsystem includes primary windings coupled to the power distribution grid and a zero sequence voltage point coupled to the power module. The transformer subsystem is configured to transform the first corrective current into a second corrective current coupled to the power distribution grid such that the second corrective current cancels all or part of a fundamental neutral current. The power module is configured as a four-quadrant power module which provides real power flow in either direction between the power module and the transformer subsystem at the zero sequence voltage point.

主权项

1. A system for cancelling fundamental neutral current on a multi-phase power distribution grid, the system comprising:
a controller coupled to the power distribution grid responsive to a neutral current signal configured to determine a first corrective current based on at least the neutral current signal; a power module responsive to the controller configured to generate the first corrective current; a transformer subsystem including primary windings coupled to the power distribution grid and a zero sequence voltage point coupled to the power module, the transformer subsystem configured to transform the first corrective current into a second corrective current coupled to the power distribution grid such that the second corrective current cancels all or part of a fundamental neutral current; and wherein the power module is configured as a four-quadrant power module which provides real power flow in either direction between the power module and the transformer subsystem at the zero sequence voltage point.