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1. 发明专利

DE4025168C2 未知
公开(公告)号：DE4025168C2
公开(公告)日：2000-06-15
申请号：DE4025168
申请日：1990-08-08
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KUWABARA TAKAO , KITA EIZO
IPC分类号： F03B15/06 , F03B15/04 , F04D15/00
摘要： A variable-speed pump system comprising: a hydraulic machine having a flow adjusting means and including at least a pumping function; a rotary machine operatively connected to the hydraulic machine and including at least a motor function for rotating the hydraulic machine; a frequency converter for driving the rotary machine; and a control system for controlling variable-speed operation of the rotary machine according to a command signal from an external unit. The pump system also includes an electric power control system, a flow adjustment control system, and a rotational speed control system. The power control system has a negligibly small time constant, compared to the time constant of the rotational speed control system. The flow adjustment control system and/or the rotational speed control system has a means for setting a transmission function in such a manner that a mechanical load of the hydraulic machine is not reduced while the rotational speed thereof is increasing, and that the mechanical load is not increased while the rotational speed is lowering.

2. 发明专利

DE3855290D1 未知
公开(公告)号：DE3855290D1
公开(公告)日：1996-06-20
申请号：DE3855290
申请日：1988-08-03
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KUWABARA TAKAO , NAKAGAWA HIROTO , KITA EIZO
IPC分类号： F03B15/06 , F03B15/00
摘要： A variable speed hydro-power plant includes a pump turbine (2) having a S-shaped characteristics at the turbine operation. A current time turbine operating point is grasped on a turbine characteristics diagram of the pump turbine (2). A limit operation characteristics curve (nr) of the pump turbine (2) is formed in advance so as to not reach the S-shaped characteristics turbine operation region. A reach of the limit operation characteristics curve (nr) is detected, a rotating speed (N) of the pump turbine (2) is lowered. An inrush of the pump turbine (2) into the S-shaped characteristics turbine operation region is eliminated, so the continuation of a stable and reliable turbine operation can be guaranteed.

3. 发明专利

CA1266506A CONTROL APPARATUS FOR VARIABLE-SPEED HYDRAULIC POWER GENERATING SYSTEM 未知
公开(公告)号：CA1266506A
公开(公告)日：1990-03-06
申请号：CA549529
申请日：1987-10-16
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SHIOZAKI JUNICHI , BANDO AKIRA , KUWABARA TAKAO , HARAGUCHI EIJI , NAKAGAWA HIROTO
IPC分类号： H02P9/00 , F03B15/06 , F03B15/08 , F03B15/16 , H02P9/04
摘要： Disclosed is a control apparatus for a variable-speed hydraulic power generating system comprising a variable-speed a.c. electric generator connected to an a.c. electric power system and a hydraulic machine system including a water turbine for driving the generator and a guide vane for controlling an amount of water supplied to the water turbine. The control apparatus comprises a frequency converter connected between the electric power system and the generator for controlling electric power supplied from the generator to the electric power system, control means operating in response to at least an externally applied power generation command signal for controlling, on one hand, the frequency converter thereby controlling the electric power supplied from the generator to the electric power system and generating, on the other hand, a guide-vane opening command signal for controlling the guide vane thereby controlling the amount of water supplied to the water turbine, and means for reducing resonance which may occur in the hydraulic machine system when the rotation speed of the water turbine changes in response to a change of the externally applied power generation output command signal.

4. 发明专利

DE3855290T2 未知
公开(公告)号：DE3855290T2
公开(公告)日：1996-11-21
申请号：DE3855290
申请日：1988-08-03
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KUWABARA TAKAO , NAKAGAWA HIROTO , KITA EIZO
IPC分类号： F03B15/06 , F03B15/00
摘要： A variable speed hydro-power plant includes a pump turbine (2) having a S-shaped characteristics at the turbine operation. A current time turbine operating point is grasped on a turbine characteristics diagram of the pump turbine (2). A limit operation characteristics curve (nr) of the pump turbine (2) is formed in advance so as to not reach the S-shaped characteristics turbine operation region. A reach of the limit operation characteristics curve (nr) is detected, a rotating speed (N) of the pump turbine (2) is lowered. An inrush of the pump turbine (2) into the S-shaped characteristics turbine operation region is eliminated, so the continuation of a stable and reliable turbine operation can be guaranteed.

5. 发明专利

DE4025168A1 未知
公开(公告)号：DE4025168A1
公开(公告)日：1991-03-28
申请号：DE4025168
申请日：1990-08-08
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KUWABARA TAKAO , KITA EIZO
IPC分类号： F03B15/06 , F03B15/04 , F04D15/00
摘要： A variable-speed pump system comprising: a hydraulic machine having a flow adjusting means and including at least a pumping function; a rotary machine operatively connected to the hydraulic machine and including at least a motor function for rotating the hydraulic machine; a frequency converter for driving the rotary machine; and a control system for controlling variable-speed operation of the rotary machine according to a command signal from an external unit. The pump system also includes an electric power control system, a flow adjustment control system, and a rotational speed control system. The power control system has a negligibly small time constant, compared to the time constant of the rotational speed control system. The flow adjustment control system and/or the rotational speed control system has a means for setting a transmission function in such a manner that a mechanical load of the hydraulic machine is not reduced while the rotational speed thereof is increasing, and that the mechanical load is not increased while the rotational speed is lowering.

6. 发明专利

CA967076A WATER TURBINE CONTROL MEANS 未知
公开(公告)号：CA967076A
公开(公告)日：1975-05-06
申请号：CA152344
申请日：1972-09-22
申请人： HITACHI LTD
发明人： KUWABARA TAKAO
IPC分类号： G05D13/00 , F03B15/06 , G05B11/32 , G05B17/00 , G05D13/62 , H02P9/04 , F16H41/04

7. 发明专利

DE3887466T2 未知
公开(公告)号：DE3887466T2
公开(公告)日：1994-07-14
申请号：DE3887466
申请日：1988-11-24
申请人： HITACHI LTD
发明人： KUWABARA TAKAO , TAKAHASHI KAZUO
IPC分类号： G05B7/02 , G05B11/42
摘要： In an automatic control system including first and second control circuits, at least the second control circuit includes a proportional circuit (13) and a differentiation circuit (16) in addition to an integration circuit (12). When an object is controlled by switching from the first control circuit to the second control circuit, an error signal between a target signal and a feedback signal is first applied to the integration circuit (12) of the second control circuit, and after the lapse of predetermined time, the error signal is applied to the proportional circuit (13) and the differentiation circuit (16) of the second control circuit. With the constitution, jumping phenomenon is prevented which would be caused from the proportional circuit (13) and the differentiation circuit (16).

8. 发明专利

DE3887466D1 未知
公开(公告)号：DE3887466D1
公开(公告)日：1994-03-10
申请号：DE3887466
申请日：1988-11-24
申请人： HITACHI LTD
发明人： KUWABARA TAKAO , TAKAHASHI KAZUO
IPC分类号： G05B7/02 , G05B11/42
摘要： In an automatic control system including first and second control circuits, at least the second control circuit includes a proportional circuit (13) and a differentiation circuit (16) in addition to an integration circuit (12). When an object is controlled by switching from the first control circuit to the second control circuit, an error signal between a target signal and a feedback signal is first applied to the integration circuit (12) of the second control circuit, and after the lapse of predetermined time, the error signal is applied to the proportional circuit (13) and the differentiation circuit (16) of the second control circuit. With the constitution, jumping phenomenon is prevented which would be caused from the proportional circuit (13) and the differentiation circuit (16).

9. 发明专利

DE3475935D1 METHOD AND APPARATUS FOR CONTROLLING VARIABLE-SPEED HYDRAULIC POWER GENERATON SYSTEM 未知
公开(公告)号：DE3475935D1
公开(公告)日：1989-02-09
申请号：DE3475935
申请日：1984-10-24
申请人： HITACHI LTD
发明人： KUWABARA TAKAO
IPC分类号： F03B15/04 , F03B15/06 , F03B15/08 , H02P9/04

10. 发明专利

IN171140B VARIABLE -SPEED PUMPED-STORAGE SYSTEM 未知
公开(公告)号：IN171140B
公开(公告)日：1992-08-01
申请号：IN453CA1990
申请日：1990-05-29
申请人： HITACHI LTD
发明人： SAKAYORI AKIHIRO , KUWABARA TAKAO , BANDO AKIRA , OONO YASUTERU , HAYASHI SRIGEAKI , YOKOYAMA ISAO , OGIWARA KENJU
IPC分类号： H03B19/00

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