Systems for managing electrical power

Abstract

Certain exemplary embodiments comprise a system comprising a plurality of Active Front End units adapted to be electrically coupled to a direct current (DC) bus. Each of the plurality of Active Front End units can be adapted to be electrically coupled to a separate winding of a transformer of a plurality of transformers. Each of the plurality of Active Front End units can be adapted to convert alternating current (AC) voltage to a DC voltage. Each of the plurality of Active Front End units can be adapted to supply the DC voltage to the DC bus. The DC bus can be adapted to be electrically coupled to a plurality of inverters.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to pending US Provisional Patent Application Serial No. 60 / 609,764 (Attorney Docket No. 2004P15695US), filed September 14, 2004, which is incorporated by reference in its entirety. Background technique [0003] Harmonic distortion occurs when switching power supply units in a circuit. For example, harmonic distortion occurs in circuits that power electric motors contained in machines. [0004] The electrical systems associated with the machine may include motor controls and other high power electrical systems (eg beyond 2MW). In particular, the machine may comprise Active Front End units, which may also be referred to as self-commutated rectifiers. In some electrical systems, an active front-end unit (AFE) converts alternating current (AC) to direct current (DC). Active front-end units switch at a predetermined rate. The switching of these currents can cause current harmonics in the A...

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Problems solved by technology

Also, transformer phase shifts may occur when utilizing conventional systems and methods

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