Harmonic blocking converter system
First Claim
1. A converter system for converting power between an AC power source and a DC power source, comprising:
- a conventional wye-wye/delta transformer having primary and secondary windings, said primary winding having a primary wye winding set for coupling to said AC power source, and said secondary windings comprising a secondary wye winding set and a secondary delta winding set, said secondary wye winding set including first, second, and third wye input nodes, said secondary delta winding set including first, second, and third delta input nodes that are not connected to said first, second, and third wye input nodes and thereby establish electrical isolation between said secondary wye winding set and said secondary delta winding set;
a converter coupled to said secondary windings and to said DC power source for transferring power therebetween, said converter generating harmonic currents; and
a polyphase harmonic blocker for blocking selected harmonics of said harmonic currents, said harmonic blocker having first and second blocking coil sets, said first blocking coil set connected between said converter and said secondary wye winding set and said second blocking coil set connected between said converter and said secondary delta winding set, with one of said first and second blocking coil sets providing an additive secondary current, and the other of said first and second blocking coil sets providing a subtractive secondary current, said additive secondary current and said subtractive secondary current reducing harmonics at said primary wye winding set.
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Abstract
A harmonic blocking converter system for converting power between an AC source and a DC source includes a harmonic blocking transformer and a converter which generates undesirable harmonic currents including fifth and seventh harmonic components. The harmonic blocking transformer includes a polyphase main transformer and a harmonic blocker coupled with wye and delta secondary windings of the main transformer, so as to substantially block passage of the fifth and seventh harmonic currents to the AC source. A waveform enhancer may couple the harmonic blocking transformer with the converter. The converter may be constructed for 2-level operation, or, with the addition of auxiliary diodes, for 3-level operation. Such a harmonic blocking transformer and a method of blocking undesirable harmonic currents are also provided.
69 Citations
12 Claims
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1. A converter system for converting power between an AC power source and a DC power source, comprising:
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a conventional wye-wye/delta transformer having primary and secondary windings, said primary winding having a primary wye winding set for coupling to said AC power source, and said secondary windings comprising a secondary wye winding set and a secondary delta winding set, said secondary wye winding set including first, second, and third wye input nodes, said secondary delta winding set including first, second, and third delta input nodes that are not connected to said first, second, and third wye input nodes and thereby establish electrical isolation between said secondary wye winding set and said secondary delta winding set; a converter coupled to said secondary windings and to said DC power source for transferring power therebetween, said converter generating harmonic currents; and a polyphase harmonic blocker for blocking selected harmonics of said harmonic currents, said harmonic blocker having first and second blocking coil sets, said first blocking coil set connected between said converter and said secondary wye winding set and said second blocking coil set connected between said converter and said secondary delta winding set, with one of said first and second blocking coil sets providing an additive secondary current, and the other of said first and second blocking coil sets providing a subtractive secondary current, said additive secondary current and said subtractive secondary current reducing harmonics at said primary wye winding set. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A harmonic blocking transformer for coupling an AC power source to a converter for transferring power between said AC power source and a DC power source, said converter generating undesirable harmonic currents including fifth and seventh harmonic components, said harmonic blocking transformer comprising:
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a conventional wye-wye/delta transformer having primary and secondary windings, said primary winding having a primary wye winding set for coupling to said AC power source, and said secondary windings comprising a secondary wye winding set and a secondary delta winding set, said secondary wye winding set including first, second and third wye input nodes, said secondary delta winding set including first, second, and third delta input nodes that are not connected to said first, second, and third wye input nodes, and thereby provide electrical isolation between said secondary wye winding set and said secondary delta winding set; and a polyphase harmonic blocker having first and second blocking coil sets, said first blocking coil set connected between said converter and said secondary wye winding set and said second blocking coil set connected between said converter and said secondary delta winding set, with one of said first and second blocking coil sets providing an additive secondary current, and the other of said first and second blocking coil sets providing a subtractive secondary current, said additive secondary current and said subtractive secondary current reducing harmonics at said primary wye winding set. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification