US 6,995,993 B2 · Rectification system for improving power quality of electrical power systems

Abstract

A system and method for an autotransformer configuration including a plurality of windings which can be used to provide a substantial reduction in harmonics. The autotransformer includes a series of wye windings configured to provide a constant length voltage vector for any given input voltage, and a series of delta windings having a variable length voltage vector based upon turns ratio. The delta winding circuit is electrically coupled with the wye winding circuit to allow circulation of triplen harmonics, thereby reducing the effect on input current waveform such that total harmonic distortion (THD) is reduced, and producing an equivalent kVA rating that is lower than prior art applications, which results in savings in size, weight and cost.

Claims20

Dependent claims

A harmonic circulating autotransforner, comprising:

a primary side having a plurality of inputs, each input having at least six winding segments and each segment producing a voltage vector, each input electrically coupled at a point on said winding segments;
an inner delta circuit, wherein at least one winding segment from each input is positioned in said inner delta circuit to provide at least one circulation path for triplen harmonic waveforms between inputs;
wherein at least one winding segment from each input forms a circuit between at least one input and said inner delta circuit;
a secondary side having a plurality of outputs, each output electrically coupled at a point on said winding segments;
and
wherein at least one winding segment from each input forms a circuit between each input and each output, said circuit separating each said output voltage vector by about 40 electrical degrees.

3 more elements

Dependencies are inferred from the claim text.

Rectification system for improving power quality of electrical power systems

Life of this patent

Rectification system for improving power quality of electrical power systems

Life of this patent

Abstract

Claims20