IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0446386
(2003-05-28)
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발명자
/ 주소 |
- Gupta,Suresh C.
- Burnham,Douglas R.
- Teets,J. Michael
- Teets,Jon W.
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출원인 / 주소 |
- Elliott Energy Systems, Inc.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
12 인용 특허 :
25 |
초록
▼
An electrical system for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an AC output circuit or the stator winding of the alternator. A control circuit during a startup mode switches
An electrical system for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an AC output circuit or the stator winding of the alternator. A control circuit during a startup mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the AC output circuit. Thus, during the startup mode, the alternator functions as a motor to raise the speed of the turbine to a safe ignition speed and in the power out mode the electrical system outputs the AC output circuit, electrical power having a frequency unrelated to the rotation speed of the alternator.
대표청구항
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What is claimed: 1. A method for controlling a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator, the method comprising: a startup process to provide startup electrical power to the turbine/alternator through an inverter section to controllably rotate the permanen
What is claimed: 1. A method for controlling a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator, the method comprising: a startup process to provide startup electrical power to the turbine/alternator through an inverter section to controllably rotate the permanent magnet alternator to start the turbine/alternator; and a power output process, after the turbine/alternator has reached speeds necessary to sustain operation of the turbine, to reconfigure the inverter section to extract output electrical power for providing user electrical power from the turbine/alternator, wherein during the startup process, the inverter section provides the permanent magnet alternator with a controlled time variant AC power, wherein during the power output process, a frequency of the output electrical power is independent of a rotor speed of the turbine. 2. The method according to claim 1, wherein the inverter section comprises an inverter, an inverter power circuit to input/output power to/from the inverter, and an inverter control circuit to control the inverter. 3. The method according to claim 1, wherein the inverter section comprises a single inverter. 4. The method according to claim 2, wherein reconfiguring of the inverter section includes switching of the inverter power circuit and switching of control of the inverter. 5. The method according to claim 1, wherein the time variant AC power has time variant frequencies and/or time variant frequency voltages. 6. The method according to claim 1, wherein the time variant AC power is controlled in a closed loop manner. 7. The method according to claim 6, wherein the closed loop manner control is based upon rotor position feedback. 8. The method according to claim 7, wherein the rotor position is detected by a shaft position sensor. 9. The method according to claim 8, wherein the shaft position sensor is a Hall effect sensor. 10. The method according to claim 1, wherein a power boost is utilized during the startup process. 11. The method according to claim 10, wherein the power boost is a boost chopper. 12. The method according to claim 11, wherein the boost chopper is controlled by a controller to ramp the voltage supplied to the inverter section. 13. The method according to claim 2, wherein a variable voltage DC power supply applies a time variant voltage to a power input circuit of the inverter during the startup process. 14. The method according to claim 13, wherein once the permanent magnet alternator has reached its normal operating speed, the variable voltage DC power supply is deactivated. 15. The method according to claim 2, wherein the AC output voltage of the permanent magnet alternator is rectified and the resulting DC output voltages are applied to a power input circuit of the inverter during the power output process. 16. The method according to claim 2, wherein the reconfiguration permits the inverter to operate as a fixed frequency power output source independent of the rotor speed of the turbine. 17. The method according to claim 2, wherein the inverter provides output power through an output filter during the power output process. 18. The method according to claim 17, wherein the output filter comprises an inductor and a capacitor. 19. The method according to claim 17, wherein the filtered output power is supplied to load through an output contactor controlled by a system controller and an output breaker. 20. The method according to claim 17, wherein a system controller controls fuel flow, ignition, rotation speed, temperature, and/or pressure. 21. The method according to claim 1, wherein the startup electrical power is supplied from a temporary power supply. 22. The method according to claim 2, wherein at an initial stage of the startup process, a fixed low frequency signal is supplied to the inverter control circuit. 23. The method according to claim 1, wherein the time variant AC power is a three-phase AC power. 24. The method according to claim 1, wherein the time variant AC power is controlled in an open-loop manner. 25. The method according to claim 2, wherein the output current is sensed and is fed back to enable current limit and power balancing of the inverter output. 26. The method according to claim 1, wherein during the power output process, a phase of the power grid voltage is monitored. 27. The method according to claim 1, wherein during the power output process, a voltage amplitude of the power grid voltage is monitored.
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