IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0315377
(2011-12-09)
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등록번호 |
US-8625316
(2014-01-07)
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발명자
/ 주소 |
- Grbovic, Petar Jovan
- Giroux, Mathieu
|
출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
4 |
초록
▼
A neutral point clamped (NPC) power converter fault protection system is provided, and include a DC bus, a switching network, and a control module. The switching network is connected to the DC bus. The switching network includes at least two leg circuits. Each of the at least two leg circuits includ
A neutral point clamped (NPC) power converter fault protection system is provided, and include a DC bus, a switching network, and a control module. The switching network is connected to the DC bus. The switching network includes at least two leg circuits. Each of the at least two leg circuits includes at least two switches connected in series and two NPC diodes. Each of the two NPC diodes corresponds to one of the at least two switches. Each of the at least two switches has an open position. The two NPC diodes are connected between a corresponding one of the at least two leg circuits and the DC bus. The control module is in communication with the switching network. The control module includes control logic for monitoring the switching network to detect a fault condition.
대표청구항
▼
1. A neutral point clamped (NPC) power converter fault protection system, comprising: a DC bus;a switching network connected to the DC bus, the switching network including at least two leg circuits, each of the at least two leg circuits including: at least two switches connected in series and two NP
1. A neutral point clamped (NPC) power converter fault protection system, comprising: a DC bus;a switching network connected to the DC bus, the switching network including at least two leg circuits, each of the at least two leg circuits including: at least two switches connected in series and two NPC diodes, each of the two NPC diodes corresponding to one of the at least two switches, each of the at least two switches having an open position, the two NPC diodes connected between a corresponding one of the at least two leg circuits and the DC bus; anda control module in communication with the switching network, the control module including: a first control logic for monitoring the switching network to detect a fault condition, the fault condition indicating that one of the two NPC diodes of the one of the at least two leg circuits is non-operational;a second control logic for switching the at least two switches of each of the at least two leg circuits to the open position;a third control logic for determining a position of a non-operational NPC diode if the fault condition is detected; anda fourth control logic for maintaining one of the at least two switches in the open position. 2. The NPC power converter fault protection system as recited in claim 1, wherein each of the at least two switches includes a freewheeling diode. 3. The NPC power converter fault protection system as recited in claim 1, comprising a circuit breaker selectively connected to a power grid, the circuit breaker in communication with the control module, wherein the control module includes a fifth control logic for disconnecting the circuit breaker from the power grid if the fault condition exists. 4. The NPC power converter fault protection system as recited in claim 3, comprising a corresponding line inductor positioned between each of the at least two leg circuits and the circuit breaker. 5. The NPC power converter fault protection system as recited in claim 4, wherein each of the at least two leg circuits include four switches, and wherein the second control logic switches two of the four switches of each of the at least two leg circuits that are positioned closest to the corresponding line inductor to a closed position. 6. The NPC power converter fault protection system as recited in claim 4, wherein the switching network includes three leg circuits and two capacitors, wherein the two capacitors are each connected to a neutral point of the switching network. 7. The NPC power converter fault protection system as recited in claim 6, wherein each of the three leg circuits include four switches, and wherein the second control logic switches two of the four switches of a leg circuit positioned closest to the two capacitors and closest to the corresponding line inductor to a closed position. 8. The NPC power converter fault protection system as recited in claim 6, wherein each of the three leg circuits include four switches, and wherein the control module includes a sixth control logic for switching a remaining portion of the four switches of each of the three leg circuits that are not maintained in the open position using space vector modulation. 9. The NPC power converter fault protection system as recited in claim 1, wherein the control module includes a seventh control logic for providing pulse width modulation (PWM) control to the switching network, and wherein space vector modulation is used to control the at least two switches. 10. A neutral point clamped (NPC) power converter connected to a circuit breaker and a DC bus, the circuit breaker selectively connected to a power grid, comprising: a switching network connected to the DC bus, the switching network including at least two leg circuits, each of the at least two leg circuits including: at least two switches connected in series and two NPC diodes, each of the two NPC diodes corresponding to one of the at least two switches, each of the at least two switches having an open position, the two NPC diodes connected between a corresponding one of the at least two leg circuits and the DC bus, and each of the at least two switches including a freewheeling diode; anda control module in communication with the switching network of the power converter and the circuit breaker, the control module including: a first control logic for monitoring the switching network to detect a fault condition, the fault condition indicating that one of the two NPC diodes of the one of the at least two leg circuits is non-operational;a second control logic for switching the at least two switches of each of the at least two leg circuits to the open position;a third control logic for determining a position of a non-operational NPC diode if the fault condition is detected;a fourth control logic for maintaining one of the at least two switches in the open position; anda fifth control logic for disconnecting the circuit breaker from the power grid if the fault condition exists. 11. The NPC power converter as recited in claim 10, comprising a corresponding line inductor positioned between each of the at least two leg circuits and the circuit breaker. 12. The NPC power converter as recited in claim 11, wherein each of the at least two leg circuits include four switches, and wherein the second control logic switches two of the four switches of each of the at least two leg circuits that are positioned closest to the corresponding line inductor to a closed position. 13. NPC power converter as recited in claim 11, wherein the switching network includes three leg circuits and two capacitors that are each connected to a neutral point of the switching network. 14. The NPC power converter as recited in claim 13, wherein each of the three leg circuits include four switches, and wherein the second control logic switches two of the four switches of a leg circuit positioned closest to the two capacitors and closest to the corresponding line inductor to a closed position. 15. The NPC power converter as recited in claim 13, wherein each of the three leg circuits include four switches, and wherein the control module includes sixth control logic for switching a remaining portion of the four switches of each of the three leg circuits that are not maintained in the open position using space vector modulation. 16. The NPC power converter as recited in claim 10, wherein the control module includes a seventh control logic for providing pulse width modulation (PWM) control to the switching network, and wherein space vector modulation is used to control the at least two switches. 17. A method of controlling a neutral point clamped (NPC) power converter fault protection system, the method comprising: providing a switching network connected to a DC bus, the switching network including at least two leg circuits, each of the at least two leg circuits including at least two switches connected in series and two NPC diodes, each of the two NPC diodes corresponding to one of the at least two switches;monitoring the switching network to detect a fault condition, the fault condition indicating that one of the two NPC diodes of the one of the at least two leg circuits is non-operational;switching the at least two switches of each of the at least two leg circuits to an open position;determining a position of a non-operational NPC diode if the fault condition is detected; andmaintaining one of the at least two switches in the open position. 18. The method as recited in claim 17, comprising providing each of the at least two switches with a freewheeling diode. 19. The method as recited in claim 18, comprising disconnecting a circuit breaker from a power grid if the fault condition exists. 20. The method as recited in claim 19, comprising providing a corresponding line inductor positioned between each of the at least two leg circuits and the circuit breaker.
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