Power distribution systems comprising variable frequency AC generator
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02P-009/04
H02J-003/40
H02J-003/46
B63H-023/24
출원번호
US-0932289
(2013-07-01)
등록번호
US-9628010
(2017-04-18)
우선권정보
EP-12175427 (2012-07-06)
발명자
/ 주소
Clarke, Nicholas James
Childs, Jonathon
출원인 / 주소
GE Energy Power Conversion Technology LTD.
대리인 / 주소
Wood IP LLC
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
A power distribution system is described that does not rely on a fixed frequency and which therefore allows prime movers to run at different speeds in response to load demand, typically so that fuel consumption and/or harmful exhaust emissions is/are minimised. A marine power distribution and propul
A power distribution system is described that does not rely on a fixed frequency and which therefore allows prime movers to run at different speeds in response to load demand, typically so that fuel consumption and/or harmful exhaust emissions is/are minimised. A marine power distribution and propulsion system can include an ac busbar adapted to carry a variable-frequency ac distribution voltage. A plurality of ac generators are connected to the busbar, each having an associated prime mover such as a diesel engine, turbine etc. A power management controller is adapted to vary the rotational speed of the prime movers with reference to the electrical load on the ac busbar such that the generators provide a variable frequency output during normal operation of the power distribution system. Such operation is to be contrasted with conventional distribution systems which have a fixed frequency.
대표청구항▼
1. A power distribution system comprising: an ac busbar adapted to carry a variable-frequency ac distribution voltage;an ac generator connected to the ac busbar and having an associated prime mover;at least one additional ac generator connected to the ac busbar, each additional ac generator having a
1. A power distribution system comprising: an ac busbar adapted to carry a variable-frequency ac distribution voltage;an ac generator connected to the ac busbar and having an associated prime mover;at least one additional ac generator connected to the ac busbar, each additional ac generator having an associated additional prime mover; anda power management controller configured to:(i) store load profiles corresponding to the associated prime movers, wherein the load profiles relate output power to speed or frequency for the corresponding prime movers,(ii) detect a change in an electrical load on the ac busbar,(iii) select a new system frequency as the variable-frequency ac distribution voltage on the ac busbar, based on the the change in the electrical load detected and the load profiles stored,(iv) automatically vary the rotational speed of the prime movers based on the change to the electrical load detected based on the load profiles stored, and(v) vary a frequency of the output voltages of each of the ac generators to the ac busbar to match the new system frequency during normal operation of the power distribution system. 2. The power distribution system of claim 1, further comprising a speed controller associated with the prime mover and wherein the power management controller uses the speed controller to vary and maintain the speed of the prime mover. 3. The power distribution system of claim 1, wherein the power management controller includes a speed control function to select and maintain the speed of the prime mover, and hence the output frequency of the generator, based on the electrical load on the busbar such that the speed of the prime mover is varied automatically by the power management controller in response to detected changes in load demand. 4. The power distribution system of claim 3, wherein the speed control function selects the speed of the prime mover using a load profile which relates output power to speed or frequency. 5. The power distribution system of claim 3, wherein the speed control function varies the speed of the prime mover only when a steady-state load has been maintained for a pre-determined period of time. 6. The power distribution system of claim 1, further comprising two or more ac generators connected to the busbar, each having an associated prime mover, and wherein the power management controller includes a load sharing control function such that the load sharing between the generators is varied automatically by the power management controller with reference to the speed of the prime movers. 7. The power distribution system of claim 6, wherein the power management controller is further adapted to vary the speed of each prime mover once any additional generators are on-line and connected to the busbar or once any generators have been disconnected from the busbar. 8. The power distribution system of claim 6, wherein the output voltage of each generator is varied with reference to the speed of its associated prime mover and each generator comprises an automatic voltage regulator (AVR) adapted for constant flux control. 9. The power distribution system of claim 1, wherein the power management controller is further adapted to initiate the starting of one or more additional ac generators and connect them to the busbar. 10. The power distribution system of claim 9, wherein the power management controller is further adapted to initiate the unloading, disconnection and shutdown of one or more on-line generators. 11. The power distribution system of claim 1, wherein the power management controller is further adapted to temporarily suspend the variable-frequency operation when the generator is being loaded up or unloaded such that the speed of the prime mover is maintained at a selected speed. 12. The power distribution system of claim 1, further comprising an electrical load connected to the busbar by means of a power converter. 13. The power distribution system of claim 12, wherein the power converter is an active front end power converter. 14. The power distribution system of claim 12, wherein the power management controller is further adapted to vary the speed of the associated prime mover in response to a voltage boost request signal from the power converter. 15. The power distribution system of claim 12, wherein the electrical load is a propulsion motor or a thruster motor. 16. The power distribution system of claim 1, further comprising a second ac busbar adapted to carry a fixed-frequency ac distribution voltage, the first and second busbars being connected together by at least one power converter and an optional transformer. 17. The power distribution system of claim 16, wherein the at least one power converter is an active front end power converter adapted to provide a fixed-frequency output. 18. A method of operating a power distribution system comprising an ac busbar adapted to carry a variable-frequency ac distribution voltage, and a plurality of ac generators connected to the ac busbar and each having an associated prime mover, and a power management controller; the method comprising: storing load profiles corresponding to the associated prime movers, wherein the load profiles relate output power to speed or frequency for the corresponding prime movers;detecting a change in an electrical load on the ac busbar;selecting a new system frequency as the variable-frequency ac distribution voltage on the ac busbar, based on the the change in the electrical load detected and the load profiles stored;automatically varying the rotational speed of the prime movers based on the change to the electrical load detected based on the load profiles stored; andvarying a frequency of the output voltages of each of the ac generators to the ac busbar to match the new system frequency during normal operation of the power distribution system.
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이 특허에 인용된 특허 (4)
Cronin Michael J. (Sherman Oaks CA), Aircraft providing variable and constant electric power.
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