IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0334630
(2008-12-15)
|
등록번호 |
US-8111048
(2012-02-07)
|
우선권정보 |
JP-2008-146930 (2008-06-04) |
발명자
/ 주소 |
- Kenzaki, Akira
- Machino, Takeshi
|
출원인 / 주소 |
- Mitsubishi Electric Corporation
|
대리인 / 주소 |
Buchanan Ingersoll & Rooney PC
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
4 |
초록
▼
A double fed synchronous generator motor which is coupled to a reversible pump-turbine and operated while switched to a power generating operation mode or a pumping operation mode, is equipped with a controller for controlling the double fed synchronous generator motor so that power output from the
A double fed synchronous generator motor which is coupled to a reversible pump-turbine and operated while switched to a power generating operation mode or a pumping operation mode, is equipped with a controller for controlling the double fed synchronous generator motor so that power output from the double fed synchronous generator motor is coincident with an instruction value and the rotating speed is set between upper and lower limit values of the rotating speed by changing exciting current. In the power generating operation mode, the lower limit value of the rotating speed is varied by active power output from the double fed synchronous generator motor, and when the active power is small, the lower limit value of the rotating speed is set to a smaller value than that when the active power is large.
대표청구항
▼
1. A double fed synchronous generator motor which is coupled to a reversible pump-turbine and operated while switched to a power generating operation mode or a pumping operation mode, comprising a controller for controlling the double fed synchronous generator motor so that power output from the dou
1. A double fed synchronous generator motor which is coupled to a reversible pump-turbine and operated while switched to a power generating operation mode or a pumping operation mode, comprising a controller for controlling the double fed synchronous generator motor so that power output from the double fed synchronous generator motor is coincident with an instruction value and the rotating speed is set between upper and lower limit values of the rotating speed by changing exciting current, wherein in the power generating operation mode, the lower limit value of the rotating speed is varied by active power output from the double fed synchronous generator motor, and when the active power is small, the lower limit value of the rotating speed is set to a smaller value than that when the active power is large. 2. The double fed synchronous generator motor according to claim 1, wherein in the power generating operation mode, the lower limit value of the rotating speed is varied on the basis of reactive power by large excitation current output from the double fed synchronous generator motor, and when the reactive power by large excitation current is small, the lower limit value of the rotating speed is set to a value smaller than that when the reactive power by large excitation current is large. 3. The double fed synchronous generator motor according to claim 1, wherein in the power generating operation mode, the lower limit value of the rotating speed is varied on the basis of a lagging power factor of power output from the double fed synchronous generator motor, and when the lagging power factor is large, the lower limit value of the rotating speed is set to a value smaller than that when the lagging power factor is small. 4. The double fed synchronous generator motor according to claim 1, wherein in the power generating operation mode, the lower limit value of the rotating speed is varied on the basis of exciting current, and when the exciting current is small, the lower limit value of the rotating speed is set to a value smaller than that when the exciting current is large. 5. The double fed synchronous generator motor according to claim 1, wherein the controller controls the rotating speed so that the rotating speed is coincident with the target value, and in the power generating operation mode, the target value is set to be larger than the lower limit value of the rotating speed by only a predetermined value. 6. The double fed synchronous generator motor according to claim 1, wherein in a pumping operation mode, the lower limit value of the rotating speed is varied on the basis of active power input to the double fed synchronous generator motor, and when the active power is small, the lower limit value of the rotating speed is set to a value smaller than that when the active power is large. 7. The double fed synchronous generator motor according to claim 6, wherein in the pumping operation mode, the lower limit value of the rotating speed is varied on the basis of reactive power by large excitation current input to the double fed synchronous generator motor, and when the reactive power by large excitation current is small, the lower limit value of the rotating speed is set to a value smaller than that when the reactive power by large excitation current is large. 8. The double fed synchronous generator motor according to claim 6, wherein in the pumping operation mode, the lower limit value of the rotating speed is varied on the basis of a lagging power factor of power input to the double fed synchronous generator motor, and when the lagging power factor is large, the lower limit value of the rotating speed is set to a value smaller than that when the lagging power factor is small. 9. The double fed synchronous generator motor according to claim 6, herein in the pumping operation mode, the lower limit value of the rotating speed is varied on the basis of exciting current, and when the exciting current is small, the lower limit value of the rotating speed is set to a value smaller than that when the exciting current is large.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.