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US 2015/0029764 A1Published application
Transformer-less unified power flow controller
AssigneeBoard of Trustees of Michigan State University
InventorFang Zheng Peng
Life of this patent
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Abstract
A power control device includes a first terminal, a second terminal connected to a transmission line, a first cascade multilevel inverter (CMI) and a second CMI. The first CMI is connected to the second terminal. The second CMI connected in series between the first terminal and the second terminal.
Claims39
A power control device comprising:
- a first terminal;
- a second terminal connected to a transmission line;
- a first cascade multilevel inverter (CMI) connected to the second terminal;
- and
- a second CMI connected in series between the first terminal and the second terminal.
2 more elements
A method of operating a power control device, the method comprising:
- controlling a first cascade multilevel inverter (CMI) to (i) regulate average real power dissipated into and out from the first CMI and (ii) regulate average real power into and out from a second CMI;
- and
- controlling the second CMI to provide a commanded real power and a commanded reactive power from a first terminal of the power control device to a second terminal of the power control device, wherein the second CMI is connected in series between the first terminal and the second terminal, and wherein the first CMI is connected to the second terminal.
A power control device comprising:
- a first cascade multilevel inverter (CMI) connected in series between a first terminal of a first 3-phase line and a first terminal of a second 3-phase line;
- a second CMI connected in series between a second terminal of the first 3-phase line and a second terminal of the second 3-phase line;
- a third CMI connected in series between a third terminal of the first 3-phase line and a third terminal of the second 3-phase line;
- a fourth CMI having a first terminal connected to the first terminal of the second 3-phase line;
- a fifth CMI having a first terminal connected to the second terminal of the second 3-phase line;
- and
- a sixth CMI having a first terminal connected to the third terminal of the second 3-phase line.
4 more elements
A power converter comprising:
- a positive DC terminal;
- a negative DC terminal;
- and
- a plurality of converter legs connected between the positive DC terminal and the negative DC terminal, wherein each of the plurality of converter legs:
- includes a series connection of a first cascade multilevel inverter (CMI), a first inductor, a second inductor, and a second CMI, and
- is associated with a respective AC terminal that is connected to a node between the first inductor and the second inductor.
3 more elements
39-47. (canceled)
Dependencies are inferred from the claim text.