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21. 发明专利

JPS62206602A CONTROLLER CONTAINING MULTIPLEXED DETECTOR 失效
公开(公告)号：JPS62206602A
公开(公告)日：1987-09-11
申请号：JP4838486
申请日：1986-03-07
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： IIJIMA TADAHIKO , YANAGIDA SADAO , KAWAI TAKUMI , IMAHASHI HIROO
IPC分类号： G05B9/03
摘要： PURPOSE:To improve the trouble diagnosing accuracy by comparing immediately the deviations between the control command signal and the detector signal and using the signal obtained by adding the characteristics of a controlled system to the control command signal as a comparison object signal in case a system to be controlled has a large time constant. CONSTITUTION:When the control command signal 15 of a central processing unit 1 has the abnormality, no deviation exists between the detection signals of both systems A and B of detectors and therefore it is decided that the detectors of both systems are normal. Thus a switch circuit 14 of a detector is kept under a state set before the abnormality is produced. When a controlled system 11 to be controlled of a central processing unit 2 has the abnormality, no deviation is produced between both detector signals of both systems A and B and it is decided that the detectors of both systems are normal. While the deviation is produced between both detector signals when a detector 12 of the system A of a process input/output device 3 has the abnormality. At the same time, the deviation is also produced between the detector signal of the system A and the signal 15. Thus it is decided that the detector of the system B has the abnormality and also that the detector of the system B is normal. Then the circuit 14 is switched to the normal detector of the system B.

22. 发明专利

JPH11257017A TURBINE CONTROLLER 失效
公开(公告)号：JPH11257017A
公开(公告)日：1999-09-21
申请号：JP7303198
申请日：1998-03-09
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： IMAHASHI HIROO , IIJIMA TADAHIKO
IPC分类号： F01D15/10 , F01D17/24
摘要： PROBLEM TO BE SOLVED: To carry out control for ensuring a prescribed load regardless of the deviation of the system frequency. SOLUTION: This apparatus is composed of a load controlling circuit and a speed governing circuit. The load controlling circuit adjusts the output of a turbine generator 1 by operation of a load setting device 22. The speed governing circuit adjusts the output in accordance with the deviation between a rated turbine speed 113 and an actual turbine speed 100 using the turbine speed setting rate. The added value of these calculation results controls a steam adjustment valve 4 by which the steam flowing in the turbine is controlled, In order to synchronize the turbine speed and the system frequency before a generator breaker 8 is turned on, the output value from the load setting device is stored immediately before synchronous control begins, a corrected value is obtained based on the deviation from the output value from the load setting device immediately before the generator breaker is turned on, and correction circuits 30, 29 are set up. Upon turning in the generator breaker, the correction circuits return the present value by which the load setting device has been operated to the state immediately before the start of the synchronous control, based on a command to increase/decrease the speed, in accordance with the deviation of the system frequency.

23. 发明专利

JPH0719007A TURBINE CONTROL DEVICE 失效
公开(公告)号：JPH0719007A
公开(公告)日：1995-01-20
申请号：JP18709593
申请日：1993-06-30
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： TSUJI SHINTARO , KAWAI TAKUMI , IIJIMA TADAHIKO
IPC分类号： F01D17/10 , F01D17/24 , F01D21/00 , F01D21/14 , F01D21/16 , F01D21/20
摘要： PURPOSE:To realize stable load correction during operation of a plant by regulating and setting optionally valve opening direction speed after the end of close test for a turbine major valve so as to provide its coordination of a change in a flow amount (load) correction. CONSTITUTION:In a turbine control device provided with a valve closing operation test circuit for testing closing operation of a major control valve for controlling the flow amount of steam which flows from a boiler into a turbine, a means 86 for setting valve opening direction speed until recovery of a control position after valve closing operation test is provided independently of a normal valve opening direction speed setting means 82, and the valve opening direction speed is set so that it can match plant load and pressure correction.

24. 发明专利

JPH06137107A TURBINE CONTROL DEVICE 失效
公开(公告)号：JPH06137107A
公开(公告)日：1994-05-17
申请号：JP28415792
申请日：1992-10-22
申请人： HITACHI LTD
发明人： TOMURA TAKASHI , IIJIMA TADAHIKO , AMAHI YASUHIRO , KAWAI TAKUMI , YANAGIDA SADAO
IPC分类号： F01D17/00 , F01D19/00 , F01K13/02 , F02C9/00 , G05B13/02 , G05B13/04
摘要： PURPOSE:To dispense with fine adjustment according to characteristic or secular change of a turbine and impart high controllability. CONSTITUTION:This turbine control device 1 is constituted of a speed command preparation part 13 to search a command speed at present and an estimated command speed after a short time out of a target speed TS and a target acceleration TA, a speed estimation part 12 to search an estimated speed after a short time out of an actual speed AS at present, adder-subtractor devices 14, 15 to search the present value e (0) and the estimated value e (1) of control deviation, a fuzzy inference part 16 to output the variation of the position of a steam valve from the e (0) and e (1), and a valve command preparation part 17 to prepare the position command of the steam valve according to variation of the position of the steam valve. Thereby, high controllability is obtained so as to enable turbine control of high accuracy, even without finely adjusting the control device against secular change of the turbine or change of the operating condition.

25. 发明专利

JPH0626305A TURBINE CONTROL DEVICE 失效
公开(公告)号：JPH0626305A
公开(公告)日：1994-02-01
申请号：JP18359392
申请日：1992-07-10
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： IIJIMA TADAHIKO , KAWAI TAKUMI , TSUJI SHINTARO , IMAHASHI HIROO
IPC分类号： F01D19/00
摘要： PURPOSE:To shorten the starting time of a turbine by starting a turbine generator of two-shaft constitution so as to prevent the overshoot of a secondary turbine at the time of reaching the target speed. CONSTITUTION:A speed deviation control circuit 201 receiving the input of speed feedback signals 210, 211 of a primary turbine and a secondary turbine so as to output a speed deviation signal 212 is additionally provided with a valve position request signal decrease control circuit 202 receiving the input of a target speed signal 213 and the secondary turbine speed feedback signal 211 so as to output the valve position request signal 214 of a minus signal from the deviation signal, and a matching circuit 203 for matching the output signal from the respective circuits 201, 202.

26. 发明专利

JPH0545761B2 失效
公开(公告)号：JPH0545761B2
公开(公告)日：1993-07-12
申请号：JP20600087
申请日：1987-08-19
申请人： HITACHI LTD
发明人： IRIE KEITA , KAWAI TAKUMI , IIJIMA TADAHIKO
IPC分类号： F01D17/24 , F01D19/00

27. 发明专利

JPH04228839A SERVO VALVE CONTROL DEVICE AND ITS CONTROL METHOD 失效
公开(公告)号：JPH04228839A
公开(公告)日：1992-08-18
申请号：JP11989291
申请日：1991-05-24
申请人： HITACHI LTD
发明人： TANI YUKISUMI , YANAGIDA SADAO , IWAMIYA KENJI , KAWAI TAKUMI , IIJIMA TADAHIKO
IPC分类号： F01D21/14 , F01K13/02 , F02C9/00 , F02C9/28 , G05B9/03
摘要： PURPOSE:To provide a device and its control method to control a servo valve in a normal manner even when two or more control systems among the triplex control systems are in an abnormal condition. CONSTITUTION:The device consists of a means to identify any abnormalities of the respective components, an output separating means of a servo amplifier, a means to make an arbitrary combination of the respective components and a corrective means of the servo amplifier. Even when two control systems among the triplex control systems are in an abnormal condition, three coil servos are driven by making combination of normal components, correction of the servo amplifier, and separation of the servo amplifier output so long as at least one component is in a normal condition. This constitution enables successive operation without disturbance of the plant by making combination of normal components or separation of the servo amplifier output when the servo amplifier is in an abnormal condition.

28. 发明专利

JPH04128503A TURBINE VALVE CONTROL CIRCUIT 失效
公开(公告)号：JPH04128503A
公开(公告)日：1992-04-30
申请号：JP24757790
申请日：1990-09-19
申请人： HITACHI LTD
发明人： ISHIKAWA TOSHIYOSHI , IIJIMA TADAHIKO
IPC分类号： F01D19/00
摘要： PURPOSE:To close certainly a valve, while shorten always a time until a turbine is started to the minimum, by correcting changing of a valve opening detecting signal when the valve is full-closed by temperature-change of a valve body so as to supply always a constant closing signal to a valve driving part. CONSTITUTION:A valve driving signal E is inputted to an adder 20 so as to make comparison-operation with output D of a signal generator 16. A deviation signal F is changed into a same signal as a prior valve opening command signal A to be inputted in an adder 11. Since, the above signal E is controlled to a value same as the output value D which is set always regardless of change of a signal B when a valve is full-closed, it is possible to certainly fully close the valve always even if the output value D is set to a small value on one side. Also, since, an initial value of a proportional-plus-integral operator 14 is the same value as the above signal F, regardless of condition of the above signal B, both signals come to satisfy the equation A=B in a short time when a turbine starting mode is selected (switches 15, 17 are changed over to b sides), so that it is thus possible to start opening of the valve always after the same time.

29. 发明专利

JPH0346012A TURBINE CONTROLLER 失效
公开(公告)号：JPH0346012A
公开(公告)日：1991-02-27
申请号：JP18079489
申请日：1989-07-13
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KAWAI TAKUMI , TSUJI SHINTARO , IIJIMA TADAHIKO , YANAGIDA SADAO , IMAHASHI HIROO
IPC分类号： G05D13/62 , F01K7/24
摘要： PURPOSE:To reduce thermal stress and to shorten the starting time of a plant by fixing an interception valve to a constant opening even if the interception value is controlled in a closed direction, securing the warming up of an intermediate pressure turbine, automatically shifting speed control to a control valve and warming up a high pressure turbine. CONSTITUTION:At the time of holding the rise of a turbine speed, which follows the state change of vapor by the close control of the interception valve 8, the interception valve 8 is held to the constant opening and the warming up of the high pressure turbine 4 and the intermediate pressure turbine 10 is secured. Then, the close control of the interception valve 8 is detected and speed control is shifted from the interception valve 8 to the control valve 3. Thus, the turbine can securely be warmed up and thermal stress can be reduced, whereby the starting time of the plant can be shortened.

30. 发明专利

JPH02238103A TURBINE CONTROLLER 失效
公开(公告)号：JPH02238103A
公开(公告)日：1990-09-20
申请号：JP5773089
申请日：1989-03-13
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KAWAI TAKUMI , IIJIMA TADAHIKO , YANAGIDA SADAO , TSUJI SHINTARO
IPC分类号： F01D19/00 , F01D21/00 , F01D21/14 , F01K7/24
摘要： PURPOSE:To improve the controllability by once closing a reducing valve and an intercepting valve in the turbine speed run back control mode and setting the opening degree of the reducing valve to a memorized run back opening degree on the reopening and carrying out the turbine speed control with the intercepting valve. CONSTITUTION:When the turbine speed is increased, the difference between the aimed accelerating speed 105 and the aimed speed 101 is PI-calculated by a calculator 106, and the output is inputted into an integrator 109, and a control signal 130 is obtained. A reducing valve 3 is opened by the output which is obtained by adding the bias 112 on the start of opening of the reducing valve onto the control signal 130 by an adder 113, and the turbine speed increase is started. In run back, a switch 103 is turned OFF, and a switch 104 is turned ON, and the aimed speed is switched to the aimed run-back speed 102, and the difference from the turbine speed 128 is PI-calculated in the calculation part 106. A switch 121 is turned ON by the output of a comparator 115, and an intercepting valve control signal 150 as the output of a subtraction calculator 114 is added onto the reducing valve control signal by an adder 117, and the reducing valve 3 is perfectly closed.

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