Hybrid direct current link system for a regenerative drive
First Claim
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1. A system, comprising:
- a converter operatively connected to an alternating current (AC) power source and a direct current (DC) bus, the converter comprising a first plurality of switching devices in selective communication with each phase of the AC power source and the DC bus;
an inverter operatively connected to a motor and the DC bus, the inverter comprising a second plurality of switching devices in selective communication with each phase of the motor and the DC bus; and
a hybrid DC link system operatively connected between a high side and a low side of the DC bus, the hybrid DC link system comprising a ripple current control branch in parallel with an energy buffering branch, wherein;
the ripple current control branch comprises at least one film capacitor connected between the high side and the low side of the DC bus; and
the energy buffering branch comprises;
one or more electrolytic capacitors with an impedance element between the high side and the low side of the DC bus; and
a first resistor in parallel with a first electrolytic capacitor of the one or more electrolytic capacitors and a second resistor in series with the first resistor and parallel with a second electrolytic capacitor of the one or more electrolytic capacitors.
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Abstract
A system includes a converter operatively connected to an alternating current (AC) power source and a direct current (DC) bus, an inverter operatively connected to a motor and the DC bus, and a hybrid DC link system operatively connected between a high side and a low side of the DC bus. The converter includes a first plurality of switching devices in selective communication with each phase of the AC power source and the DC bus. The inverter includes a second plurality of switching devices in selective communication with each phase of the motor and the DC bus. The hybrid DC link system includes a ripple current control branch in parallel with an energy buffering branch.
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Citations
14 Claims
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1. A system, comprising:
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a converter operatively connected to an alternating current (AC) power source and a direct current (DC) bus, the converter comprising a first plurality of switching devices in selective communication with each phase of the AC power source and the DC bus; an inverter operatively connected to a motor and the DC bus, the inverter comprising a second plurality of switching devices in selective communication with each phase of the motor and the DC bus; and a hybrid DC link system operatively connected between a high side and a low side of the DC bus, the hybrid DC link system comprising a ripple current control branch in parallel with an energy buffering branch, wherein; the ripple current control branch comprises at least one film capacitor connected between the high side and the low side of the DC bus; and the energy buffering branch comprises; one or more electrolytic capacitors with an impedance element between the high side and the low side of the DC bus; and a first resistor in parallel with a first electrolytic capacitor of the one or more electrolytic capacitors and a second resistor in series with the first resistor and parallel with a second electrolytic capacitor of the one or more electrolytic capacitors. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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operably connecting a converter to an alternating current (AC) power source and a direct current (DC) bus, the converter comprising a first plurality of switching devices in selective communication with each phase of the AC power source and the DC bus; operably connecting an inverter to a motor and the DC bus, the inverter comprising a second plurality of switching devices in selective communication with each phase of the motor and the DC bus; operably connecting a hybrid DC link system between a high side and a low side of the DC bus, the hybrid DC link system comprising a ripple current control branch in parallel with an energy buffering branch, wherein; the ripple current control branch comprises at least one film capacitor connected between the high side and the low side of the DC bus; and the energy buffering branch comprises; one or more electrolytic capacitors with an impedance element between the high side and the low side of the DC bus; and a first resistor in parallel with a first electrolytic capacitor of the one or more electrolytic capacitors and a second resistor in series with the first resistor and parallel with a second electrolytic capacitor of the one or more electrolytic capacitors; limiting a ripple current on the DC bus through the ripple current control branch of the hybrid DC link system; and buffering variations in energy of the DC bus through the energy buffering branch of the hybrid DC link system. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification