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1. 发明专利

JP2001041142A HYDRAULIC MACHINERY FOR HYDRAULIC PLANT WITH SURGE TANK 失效
公开(公告)号：JP2001041142A
公开(公告)日：2001-02-13
申请号：JP21838299
申请日：1999-08-02
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO
发明人： KUWABARA HISAO , YUMOTO SHINJI , ISHIGURO MITSUHIRO , HANEDA NAOYUKI
IPC分类号： F03B15/18 , F03B15/06
摘要： PROBLEM TO BE SOLVED: To prevent excessive surging automatically by forming hydraulic machinery having a governor controlling a movable flow control means and a surge tank so as to be capable of being switched between low response setting and high response setting. SOLUTION: The speed detecting signal Xn of a speed detecting part 1 detecting the rotational speed of a pump turbine, the setting value xo of the rotational speed of a speed adjusting part 2, and the restoring signal X0 of a speed settling ratio setting part 12 are added (3). An addition result is inputted into a proportional computing element 4a and an integrating computing element 5a used normally, and a proportional computing element 4b and an integrating computing element 5b used when surging is suppressed through contacts 19a, 19b switched based on the output of a surging sensor 20. The respective output of an integrating computing element 6, the proportional computing elements 4a, 4b, and the integrating computing elements 5a, 5b are added to obtain a guide vane opening command Z (7) and control a hydraulic servo motor 10 through a limiter 9.

2. 发明专利

JPH07279814A HYDRAULIC POWER GENERATION SYSTEM, AND OPERATION CONTROL METHOD THEREOF 失效
公开(公告)号：JPH07279814A
公开(公告)日：1995-10-27
申请号：JP7565394
申请日：1994-04-14
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO
发明人： HARADA MASATAKA , KUWABARA HISAO , SATO KEIICHI , SAEGUSA KAZUHIKO
IPC分类号： F03B15/08 , G05D7/06 , G05D13/62
摘要： PURPOSE:To ensure safety even in a single transmission mode, and perform the response of hydraulic turbine output to a power control command signal from afar at a higher speed by controlling the rotating speed of a generator while responding also to the output signal of a signal converter for temporarily extending the power control command signal from afar. CONSTITUTION:A signal converter 8 temporarily extends a power control command signal from afar, and outputs it to a rotating speed control device 5. At the application of the power control command signal from afar, the signal level is converted to a level higher than the step width P. The signal level of the output signal of the signal converter 8 is reduced little by little according to time, and finally converted into the original step width P. A guide vane control device 6 drives a guide vane 7 according to the output signal of the rotating speed control device 5, and regulates its opening. The flow rate of water is regulated by controlling the opening of the guide vane 7. A generator 3 is rotated by the output of a hydraulic turbine.

3. 发明专利

JP2001132610A PUMP TURBINE 失效
公开(公告)号：JP2001132610A
公开(公告)日：2001-05-18
申请号：JP31806299
申请日：1999-11-09
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KUWABARA HISAO , KATAYAMA KEI , NAKAGAWA HIROTO , HAGIWARA HARUKI
IPC分类号： F03B15/04
摘要： PROBLEM TO BE SOLVED: To provide a pump turbine capable of sufficiently attemperating influence of an S characteristic even at the time when a driving point of the pump turbine is within the S characteristic and improving stability of a governor. SOLUTION: A computing part of a governor is formed so that a water quantity adjusting means in closing motion temporarily turns to opening motion in a former half of a first rotating speed lowering curve after at least it turns to lowering from first rotating speed rise at the time of cutting off a total load through a first peak at the time of a power generating mode and at the time of cutting off a load when generated electric power of a power generating motor is suddenly cut off and the aforementioned first rotating sped lowering stops at rotating speed higher by more than 1/3 (first peak value-rated rotating speed) than rated rotating speed and starts to rise again on a pump hydraulic turbine furnished with a runner connected to the power generating motor, the water quantity adjusting means to adjust water quantity passing through this runner part and the governor to control the aforementioned water quantity adjusting means so that rotating speed of the aforementioned runner keeps specified rotating speed and formed free to drive in both modes of pumping and power generation by changing a rotating direction of the aforementioned runner.

4. 发明专利

JP2000181547A HYDRAULIC POWER PLANT 失效
公开(公告)号：JP2000181547A
公开(公告)日：2000-06-30
申请号：JP36139198
申请日：1998-12-18
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KUWABARA HISAO , YUMOTO SHINJI , NAKAGAWA HIROTO , FUKAYA SOSUKE
IPC分类号： H02J3/38 , F03B15/04 , G05B11/36 , G05D7/06
摘要： PROBLEM TO BE SOLVED: To provide a hydraulic power plant capable of detecting the shift to single operation and automatically switching the governor gain at the time of the shift to single operation. SOLUTION: A governor is provided with an integration operating part 5a for cooperative operating mode and an integration operating part 5b for single operating mode and contacts 19a and 19b are switched by a shift-to single operation sensor 20. The shift-to single operation sensor 20 sets the monitoring period from the monitoring signal of either each response signals ε of respective parts of the governor or rotating speed signal N and operates the attenuation degree of the monitoring signal during that period and when the attenuation degree is worse than a prescribed one, it is judged that the operation has been shifted to be in the shift to single operating state.

5. 发明专利

JPH10295042A VARIABLE-SPEED INDUCTION MOTOR SYSTEM 失效
公开(公告)号：JPH10295042A
公开(公告)日：1998-11-04
申请号：JP13482898
申请日：1998-05-18
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KUWABARA HISAO , NAKAGAWA HIROTO
IPC分类号： F03B15/04 , F03B15/08 , H02J3/30 , H02P9/00 , H02P9/14
摘要： PROBLEM TO BE SOLVED: To absorb and discharge the effective power of an induction motor by a method, wherein the rotational speed of a shaft is controlled on the basis of the frequency of a detected power system or on the basis of its change. SOLUTION: In an adder 30, the difference εNa between a set speed No , which decides the steady speed of a rotating body 2 and an actual rotational speed N, is derived. Then, in a speed control part 31, an effective-power command P×1 is given to a generator/motor 1, in such a way that the difference εNb becomes zero and that the stability of the speed control system of the rotating body 2 is ensured. Then, the difference Δf (f1) between the frequency (f) of a power system and its rated frequency fo is input to a speed-change-rate computing part 24. When a speed change rate becomes higher than a positive side prescribed value or lower than a negative side prescribed value through a dead-band element 25, an effective-power command P×2 which is increased or decreased according to an overshoot portion is output. The effective-power command P×2 acts in a direction in which the driving output of the generator/ motor 1 is increased when the frequency (f) is raised suddenly, and consequently when the difference Δf is raised suddenly, it acts in a direction in which the driving output is decreased when the frequency (f) is lowered suddenly.

6. 发明专利

JPH09287547A OPERATION METHOD OF HIGH SPECIFIC SPEED REVERSIBLE PUMP-TURBINE 失效
公开(公告)号：JPH09287547A
公开(公告)日：1997-11-04
申请号：JP9860896
申请日：1996-04-19
申请人： HITACHI LTD
发明人： KUWABARA HISAO , HARADA MASATAKA
IPC分类号： F03B3/10 , F03B3/18 , F03B15/04
摘要： PROBLEM TO BE SOLVED: To prevent water thrust from abnormally increasing by closing a guide vane quickly directly after interception and slowly after a first peak value of rotating speed, so that at full load interception, first and second peak values in a specific relation appear in water pressure of a pipe line on the upper stream side respectively before the first peak value of a runner rotating speed and directly after exceeding it. SOLUTION: At full load interception, the opening of a guide vane is controlled so that a first peak value Ha appearing on the pipe line water pressure on the upper stream side before rotating speed of a runner 1 becomes the first maximum rotating speed Np, and a second peak value Hb appearing on the process in which rotating speed of the runner 1 falls after the maximum value Np are in relation of Ha≈Hb or Ha>Hb. For controlling in this way, at first the opening of the guide vane is quickly closed before rotating speed of the runner 1 is raised by load interception and reached to the first maximum rotating speed Np, so as to restrain the rising width itself of rotating speed, and after reaching the first maximum rotating speed Np, it is closed at lower speed than the speed directly after interception, and hence irregular pulsation of S-shaped characteristic is restrained at minimum.

7. 发明专利

JPH0351910B2 失效
公开(公告)号：JPH0351910B2
公开(公告)日：1991-08-08
申请号：JP19904183
申请日：1983-10-26
申请人： HITACHI LTD
发明人： KUWABARA HISAO
IPC分类号： F03B15/04 , F03B15/06 , F03B15/08 , H02P9/04

8. 发明专利

JPH0370874A VARIABLE SPEED PUMP SYSTEM 失效
公开(公告)号：JPH0370874A
公开(公告)日：1991-03-26
申请号：JP20520589
申请日：1989-08-08
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KUWABARA HISAO , KITA EIZO
IPC分类号： F03B15/06 , F03B15/04 , F04D15/00
摘要： PURPOSE:To promptly meet with the demand from electric power systems while securing a stable operation by so setting the response of the flow adjustment and control system of a pump or a reversible pumpturbine, and that of the rotational speed system that they fall into a specified relationship. CONSTITUTION:A generator motor 2 is controlled through an electric power controller 7 and an electric power converter 3 by setting an appropriate rotational speed command with a rotational speed functional generator 50, and putting out an electric power control correction signal from a generator 16 based on the deviation from an actual rotational speed N, as against the total head H and electric power command Po from the outside. Furthermore, a guide vane functional generator 60 sets the opening of a guide vane which controls flow, and a controller 9 controls the guide vane opening of a pumpturbine 4 based on the deviation from an actual opening Y. The relationship between the response of a flow control system deltay/deltat and the response of a rotational speed control system deltan/deltat is so set here to become deltay/ deltan. pp/deltay+ pp/deltan>0 from the dimensionless opening y of a flow adjusting means, rotational speed n and the input pp of the pumpturbine 4.

9. 发明专利

JPH01163474A CONTROL METHOD FOR OPERATION OF VARIABLE SPEED WATER TURBINE 失效
公开(公告)号：JPH01163474A
公开(公告)日：1989-06-27
申请号：JP31884787
申请日：1987-12-18
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KUWABARA HISAO , ONO YASUTERU
IPC分类号： F03B15/04
摘要： PURPOSE:To enable the smooth and sure changeover of a mode by shifting the mode while holding a rotating speed in the vicinity of the lower limit within a variable speed band at the time of the changeover from an idling operation mode to a power generating operation mode. CONSTITUTION:When the variation in the frequency (f) of an electric power system is large during an idling operation, the temporary following variation of an effective electric power P is permitted. Hence, it is necessary to give due consideration to not making the comparison element or integral element gain in a speed control portion 31 excessively large. As the result of thus restricting the response speed of a speed control system, although the temporary variation in rotating speed N is unavoidable, normal operation can be continued so far as the rotating speed N is within a variable speed band. If the rotating speed tends to get off of the variable speed band, the holding in the variable band is carried out by means of a kick-back circuit 42.

10. 发明专利

JPS648189B2 失效
公开(公告)号：JPS648189B2
公开(公告)日：1989-02-13
申请号：JP11024880
申请日：1980-08-13
申请人： HITACHI LTD
发明人： KUWABARA HISAO
IPC分类号： F03B15/18 , F03B15/04 , F03B15/06

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