Patent ID: 7633775
Filing Date: 2009-12-15
Classification: H02M

Abstract:
1. A power generation system for supplying a resultant output voltage, the system comprising: a power converter system comprising: at least two power converter bridges each configured for switching at a low frequency and generating a corresponding converter output voltage including a fundamental voltage component and harmonic components; at least two power converter transformers, wherein two primary side windings of each respective transformer are connected such that there is an effective transformer phase shift between the phase-neutral voltage of the transformer primary and secondary sides, wherein each power converter bridge is coupled to a primary winding of a corresponding power converter transformer; a controller coupled to the power converter bridges and configured for switching at least one converter bridge with a bridge phase shift such that the fundamental voltage components are in phase with respect to one another; wherein a secondary winding of one power converter transformer is coupled to a secondary winding of a second power converter transformer; wherein the resultant output voltage comprises a sum of the fundamental voltage components of each converter output voltage, wherein the bridge phase shift and the effective transformer phase shift together are configured to cancel desired harmonics such that the resultant output voltage does not include fifth order harmonics or lower harmonics.