Synchronous electrical power distribution system startup and control
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02P-009/00
H02P-009/08
H02P-009/10
H02P-006/20
H02P-025/03
H02P-001/46
출원번호
US-0378012
(2016-12-13)
등록번호
US-10141874
(2018-11-27)
발명자
/ 주소
Blackwelder, Mark Jon
Rancuret, Paul M.
출원인 / 주소
ROLLS-ROYCE NORTH AMERICAN TECHNOLOGIES INC.
대리인 / 주소
Brinks Gilson & Lione
인용정보
피인용 횟수 :
0인용 특허 :
16
초록▼
A system may include a prime mover configured to provide mechanical energy to the system by spinning a shaft. The system further includes a synchronous AC generator mechanically coupled to the shaft, and an exciter mechanically coupled to the shaft and configured to output a field current for exciti
A system may include a prime mover configured to provide mechanical energy to the system by spinning a shaft. The system further includes a synchronous AC generator mechanically coupled to the shaft, and an exciter mechanically coupled to the shaft and configured to output a field current for exciting the synchronous AC generator. The system also includes a number of synchronous electric motors electrically coupled to the AC generator and configured to drive one or more mechanical loads. A controller of the system is configured to establish and maintain a magnetic coupling between the synchronous AC generator and the synchronous electric motors by controlling a level of the field current during a ramped increase in rotation of the synchronous AC generator from zero rotational speed. The motors accelerate synchronously with the generator due to the magnetic coupling as the rotational speed of the generator increases.
대표청구항▼
1. A system comprising: a prime mover configured to provide mechanical energy to the system by spinning a shaft;a synchronous AC generator comprising a rotor mechanically coupled to the shaft;an exciter mechanically coupled to the shaft and configured to output a variable field current to excite the
1. A system comprising: a prime mover configured to provide mechanical energy to the system by spinning a shaft;a synchronous AC generator comprising a rotor mechanically coupled to the shaft;an exciter mechanically coupled to the shaft and configured to output a variable field current to excite the synchronous AC generator;a plurality of synchronous electric motors electrically direct coupled to the synchronous AC generator and each comprising a rotor rotatable operable to drive one or more mechanical loads; anda controller configured to establish and maintain a magnetic coupling between the rotor of the synchronous AC generator and all of the rotors of the synchronous electric motors by control of a level of the field current during a ramped increase in rotation of the rotor of the synchronous AC generator from zero rotational speed based on a difference in an angle of deflection between a position of the rotor of the synchronous AC generator and a position of the rotors of the synchronous electric motors. 2. The system of claim 1, wherein the controller is further configured to control the level of the field current by application of an excitation voltage to the exciter with a magnitude and/or frequency to induce a terminal voltage at the synchronous AC generator that causes supply of torque producing current to the synchronous electric motors to commence rotation of the synchronous electric motors by establishment of the magnetic coupling during the ramped increase in rotation of the rotor of the synchronous AC generator from zero rotational speed. 3. The system of claim 2, wherein the terminal voltage is a minimum voltage needed to generate enough torque producing current to accelerate the one or more mechanical loads from a zero speed during the ramped increase in rotation of the rotor of the synchronous AC generator from zero rotational speed. 4. The system of claim 2, wherein the controller is further configured to decrease the magnitude of the excitation voltage in response to an increase in a speed of the shaft or an increase in a speed of the one or more mechanical loads to maintain the magnetic coupling during the ramped increase in rotation of the rotor of the synchronous AC generator toward rated rotational speed. 5. A system comprising: a prime mover configured to provide mechanical energy to the system by spinning a shaft;a synchronous AC generator comprising a rotor mechanically coupled to the shaft;an exciter mechanically coupled to the shaft and configured to output a variable field current to excite the synchronous AC generator; a plurality of synchronous electric motors electrically direct coupled to the synchronous AC generator and each comprising a rotor rotatable operable to drive one or more mechanical loads; and a controller configured to establish and maintain a magnetic coupling between the rotor of the synchronous AC generator and all of the rotors of the synchronous electric motors by control of a level of the field current during a ramped increase in rotation of the rotor of the synchronous AC generator from zero rotational speed by application of an excitation voltage to the exciter, a magnitude of the excitation voltage controlled by the controller to accelerate the synchronous electric motors at a same rate that the prime mover accelerates the synchronous AC generator by the controller being configured to:set the magnitude of the excitation voltage to a predetermined voltage when the speed of the shaft is at a zero speed; andset the magnitude of the excitation voltage at less than the predetermined voltage as the prime mover accelerates the speed of the shaft towards rated operational speed of the synchronous AC generator. 6. The system of claim 1, wherein the controller is configured to maintain synchronization of the synchronous electric motors to the synchronous AC generator by adjustment of the level of the field current based on an acceleration profile of the rotor of the synchronous AC generator between zero rotational speed and a rated operational speed of the synchronous AC generator. 7. The system of claim 1, wherein the controller is configured to maintain synchronization of the synchronous electric motors and the synchronous AC generator during the ramped increase in rotation of the rotor of the synchronous AC generator from zero rotational speed by control of the level of the field current during a start-up period of the prime mover. 8. A method comprising: initiating rotation of a prime mover to commence a ramped increase in rotational speed of a synchronous AC generator from a zero speed condition;establishing, by a controller, a level of a field current to excite the synchronous AC generator to form a magnetic coupling between the synchronous AC generator and a plurality of synchronous electric motors that are electrically coupled to the synchronous AC generator and configured to drive respective mechanical loads; andcontrolling, by the controller, the level of field current to maintain the magnetic coupling during the ramped increase in rotational speed of the synchronous AC generator to a full rated speed condition so that the plurality of synchronous electric motors remain synchronized with the synchronous AC generator, the level of the field current controlled by the controller by:determining a rotor angle of the synchronous AC generator in relation to an average rotor angle of the plurality of synchronous electric motors; andadjusting the field current, by the controller, according to the determined relation during the ramped increase in rotational speed of the synchronous AC generator to the full rated speed condition. 9. The method of claim 8, wherein establishing, by the controller, the level of a field current to excite the synchronous AC generator to form the magnetic coupling between the synchronous AC generator and the plurality of synchronous electric motors comprises applying, by the controller, a magnitude of excitation voltage to an exciter to induce a terminal voltage at the synchronous AC generator that causes torque producing current at the plurality of synchronous electric motors to induce synchronous rotation of all the plurality of synchronous electric motors and the respective mechanical loads from zero speed. 10. The method of claim 9, wherein all the plurality of synchronous electric motors and the respective mechanical loads are in a no-load condition at zero speed, and the magnitude of excitation voltage applied to the exciter to induce the terminal voltage at the synchronous AC generator causes only enough torque producing current at the plurality of synchronous electric motors to induce synchronous rotation under the no-load condition. 11. The method of claim 8, wherein controlling the level of the field current to maintain the magnetic coupling during the ramped increase in rotational speed of the synchronous AC generator to the full rated speed condition comprises variably applying, by the controller, an excitation voltage to an exciter at a magnitude and/or frequency to induce a terminal voltage at the synchronous AC generator that causes enough torque producing current at the plurality of synchronous electric motors to drive the respective mechanical loads during the ramped increase. 12. The method of claim 11, wherein variably applying the excitation voltage to the exciter comprises decreasing, by the controller, a magnitude of the excitation voltage in response to stiffening of the magnetic coupling between the synchronous AC generator and the plurality of synchronous electric motors during the ramped increase in rotational speed of the synchronous AC generator to the full rated speed condition. 13. The method of claim 8, wherein establishing, by the controller, the level of a field current to excite the synchronous AC generator to form the magnetic coupling between the synchronous AC generator and the plurality of synchronous electric motors comprises: setting, by the controller, the level of field current to a maximum to induce synchronous rotation of all the plurality of synchronous electric motors and the respective mechanical loads from zero speed; andwherein controlling the level of the field current to maintain the magnetic coupling during the ramped increase in rotational speed of the synchronous AC generator to the full rated speed condition comprises reducing, by the controller, the level of field current toward a minimum during the ramped increase in rotational speed of the synchronous AC generator to the full rated speed condition. 14. The method of claim 8, wherein controlling, by the controller, the level of field current to maintain the magnetic coupling during the ramped increase in rotational speed of the synchronous AC generator to the full rated speed condition comprises accelerating the synchronous electric motors synchronously with acceleration of the synchronous AC generator during the ramped increase in rotational speed of the synchronous AC generator to the full rated speed condition. 15. The method of claim 14, wherein controlling, by the controller, the level of field current to maintain the magnetic coupling during the ramped increase in rotational speed of the synchronous AC generator to the full rated speed condition comprises inferring, by the controller, a torque deflection angle representative of a difference in a rotor position of the synchronous AC generator and an average rotor position of the plurality of synchronous electric motors. 16. A system comprising: a synchronous AC generator rotated by a prime mover to generator electric power;an exciter rotated by the prime mover to generate a field current to excite the synchronous AC generator; anda controller configured to control a level of excitation of the exciter to form a magnetic coupling between the synchronous AC generator and a plurality of synchronous electric motors electrically coupled with the synchronous AC generator, the field current generated and the magnetic coupling formed as the synchronous AC generator and the exciter are accelerated from a zero speed condition by the prime mover; andthe controller further configured to control the level of excitation of the exciter to maintain the magnetic coupling and synchronously accelerate the plurality of synchronous electric motors with the synchronous AC generator toward a rated speed of the synchronous AC generator by variable application of the excitation voltage to the exciter to decrease a magnitude of the excitation voltage in response to stiffening of the magnetic coupling between the synchronous AC generator and the plurality of synchronous electric motors during the ramped increase in rotational speed of the synchronous AC generator to the full rated speed condition. 17. The system of claim 16, wherein the controller is configured to control a level of excitation of the exciter in a range between 100% and 150% of a rated level of excitation of the exciter to induce rotation of the plurality of synchronous electric motors so that the magnetic coupling is formed between the synchronous AC generator and the plurality of synchronous electric motors.
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이 특허에 인용된 특허 (16)
Shekhawat Sampat (Monmouth NJ) Tumpey John J. (Monmouth NJ) Widdis James C. (Monmouth NJ), Aircraft engine electric start system without a separate exciter field inverter.
Rozman Gregory I. (Rockford IL) Markunas Albert L. (Roscoe IL) Cook Alexander (Belvidere IL) Nguyen Vietson (Rockford IL), Starter/generator system with DC link current control.
Murugan Muthu K. (Howell NJ) Eckenfelder Robert C. (Point Pleasant NJ) Widdis James (Oceanport NJ), Stepped waveform VSCF system with engine start capability.
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