IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0095227
(2005-03-30)
|
등록번호 |
US-7359223
(2008-04-15)
|
발명자
/ 주소 |
- Datta,Rajib
- Chen,Kunlun
- Weng,Haiqing
- Raju,Ravisekhar Nadimpalli
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
13 인용 특허 :
8 |
초록
▼
A power converter system for supplying an output voltage is provided. The power converter system is adapted to operate in a normal mode and a fault mode. The system comprises a plurality of bridges and a plurality of transformers. The system further comprises a plurality of dc link capacitors, each
A power converter system for supplying an output voltage is provided. The power converter system is adapted to operate in a normal mode and a fault mode. The system comprises a plurality of bridges and a plurality of transformers. The system further comprises a plurality of dc link capacitors, each coupled across a corresponding bridge. The system also includes a controller adapted for, during the normal mode, switching each bridge with a respective normal phase shift. During the fault mode, the controller is adapted for switching each of the remaining ones of the bridges with a respective adjusted phase shift to generate the output voltage. During the fault mode, at least one of the plurality of bridges is bypassed.
대표청구항
▼
The invention claimed is: 1. A power converter system for supplying an output voltage, the power converter system configured to operate in a normal mode and a fault mode, the system comprising: a plurality of bridges; a plurality transformers, wherein each bridge is coupled to a primary winding of
The invention claimed is: 1. A power converter system for supplying an output voltage, the power converter system configured to operate in a normal mode and a fault mode, the system comprising: a plurality of bridges; a plurality transformers, wherein each bridge is coupled to a primary winding of a corresponding transformer and wherein secondary windings of the transformers are coupled together; a plurality of dc link capacitors, each coupled across a corresponding bridge; and a controller coupled to the power converter system and configured for, during the normal mode, switching each bridge with a respective normal phase shift, and, during the fault mode, bypassing at least one faulty one of the bridges and switching each of the remaining ones of the bridges with a respective adjusted phase shift to generate the output voltage. 2. The system of claim 1, further comprising a plurality of switching circuits each coupled across a corresponding dc link capacitor. 3. The system of claim 2, wherein the controller is configured to, during the fault mode, control a switching circuit corresponding to a respective faulty bridge so as to discharge a corresponding dc link capacitor. 4. The system of claim 3, wherein the controller is configured to, during the fault mode, dynamically balance dc power on the un-discharged dc links. 5. The system of claim 1, wherein the controller is configured to, during the fault mode, minimize harmonic components in the output voltage. 6. The system of claim 5, wherein the phase shift is adjusted based on a total number of bridges. 7. The system of claim 5, wherein the phase shift is adjusted based on the total number of bypassed bridges. 8. The system of claim 5, wherein difference between the phase shift of adjacent bridges equals sixty divided by the difference between a total number of bridges and a total number of bypassed bridges. 9. The system of claim 1, wherein the output voltage of the power converter system is substantially equal during the normal mode and the fault mode. 10. The system of claim 1, further comprising: a direct coupled bridge coupled to the load via the secondary winding of at least one transformer; a direct coupled dc link coupled across the direct coupled bridge; and a direct coupled switching circuit coupled across the direct coupled dc link. 11. A method for supplying an output voltage using a power converter system, the method comprising: operating in a normal mode by switching each of the bridges with a respective normal phase shift, and operating in a fault mode, wherein at least one of the plurality of bridges is bypassed; and the remaining bridges are each configured for being switched with an adjusted phase shift to generate the output voltage, wherein the power converter system comprises bridges, transformers, and dc link capacitors with each bridge being coupled to a respective transformer and having a respective dc link capacitor coupled thereacross. 12. The method of claim 11, further comprising discharging the dc link capacitor coupled across the bypassed bridge. 13. The method of claim 11, further comprising, when operating in the fault mode, dynamically balancing a dc power of the plurality of dc link capacitors. 14. The method of claim 11, further comprising maintaining a substantially equal output voltage during the normal mode and the fault mode. 15. A power converter system for supplying an output voltage, the power converter system configured to operate in a normal mode and a fault mode, the system comprising: a plurality of bridges; a plurality transformers each coupled to a respective bridge via a corresponding ac contactor, wherein secondary windings of the transformers are coupled together; a plurality of dc link capacitors, each coupled across a corresponding bridge; and a controller coupled to the power system converter and configured for, during the normal mode, switching each bridge with a respective normal phase shift, and, during the fault mode, switching at least one of the bridges with a respective adjusted phase shift so as to minimize harmonic components in the output voltage. 16. The system of claim 15, further comprising a plurality of switching circuits each coupled across a corresponding dc link capacitor; wherein the controller is configured to cause a specific switching circuit to discharge a corresponding dc link capacitor when the power converter system is operating in the fault mode. 17. The system of claim 16, wherein during the fault mode, the controller is configured to cause the switching circuit to bypass the corresponding dc link capacitor and to activate the ac contactor to bypass the corresponding transformer. 18. The system of claim 17, wherein the controller is configured to, during the fault mode, dynamically balance dc power on the un-discharged dc links. 19. The system of claim 15, wherein the output voltage of the power converter system is substantially equal during the normal mode and the fault mode.
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