MEDIUM VOLTAGE UNINTERRUPTIBLE POWER SUPPLY
First Claim
1. A medium voltage uninterruptible power supply system, comprising:
- a first power converter operatively coupled between a first bus and a second bus;
a second power converter operatively coupled to the first power converter via the first bus and the second bus, wherein the second power converter comprises at least three legs, wherein the at least three legs comprise a plurality of switching units, and wherein the plurality of switching units comprises at least two semiconductor switches and an energy storage device;
a direct current link operatively coupled between the first bus and the second bus; and
an energy source operatively coupled to the second power converter, the direct current link or both the second power converter and the direct current link via one or more of a third power converter, a transformer, and a fourth power converter.
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Accused Products
Abstract
A medium voltage uninterruptible power supply system is presented. The system includes a first power converter coupled between a first bus and a second bus. Furthermore, a second power converter operatively coupled to the first power converter via the first bus and the second bus, where the second power converter includes at least three legs, where the at least three legs include a plurality of switching units, and where the plurality of switching units includes at least two semiconductor switches and an energy storage device. Additionally, system includes a direct current link coupled between the first bus and the second bus. Also, system includes an energy source coupled to the second power converter, the direct current link, or a combination thereof via one or more of a third power converter, a transformer, and a fourth power converter. Method of operating a medium voltage uninterruptible power supply system is also presented.
46 Citations
23 Claims
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1. A medium voltage uninterruptible power supply system, comprising:
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a first power converter operatively coupled between a first bus and a second bus; a second power converter operatively coupled to the first power converter via the first bus and the second bus, wherein the second power converter comprises at least three legs, wherein the at least three legs comprise a plurality of switching units, and wherein the plurality of switching units comprises at least two semiconductor switches and an energy storage device; a direct current link operatively coupled between the first bus and the second bus; and an energy source operatively coupled to the second power converter, the direct current link or both the second power converter and the direct current link via one or more of a third power converter, a transformer, and a fourth power converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method, comprising:
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coupling a first power converter to a second power converter via a first bus and a second bus, wherein the second power converter comprises at least three legs, wherein the at least three legs comprise a plurality of switching units, and wherein the plurality of switching units comprises at least two semiconductor switches and an energy storage device; connecting a direct current link between the first bus and the second bus; operatively coupling an energy source to the second power converter, the direct current link, or both the second power converter and the direct current link via one or more of a third power converter, a transformer, and a fourth power converter; determining a switching pattern for the plurality of switching units in the second power converter; and generating an output at an output terminal of the second power converter based on the switching pattern of the plurality of switching units of the second power converter. - View Dependent Claims (21, 22)
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23. A medium voltage uninterruptible power supply system, comprising:
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a first power converter operatively coupled between a first bus and a second bus; a second power converter operatively coupled to the first power converter via the first bus and the second bus, wherein the second power converter comprises at least three legs, wherein the at least three legs comprise a plurality of switching units, and wherein the plurality of switching units comprises at least two semiconductor switches and an energy storage device; a direct current link operatively coupled between the first bus and the second bus, wherein the direct current link comprises a plurality of capacitors operatively coupled in series; and an energy source operatively coupled to the plurality of capacitors of the direct current link, each of the plurality of switching units of the second power converter, or a combination thereof via one or more of a third power converter, a transformer, and a fourth power converter.
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Specification