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1. 发明专利

JPH108914A TURBINE CONTROL DEVICE 失效
公开(公告)号：JPH108914A
公开(公告)日：1998-01-13
申请号：JP16410696
申请日：1996-06-25
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： FUJISAKI MASANORI , KAWAI TAKUMI , IIJIMA TADAHIKO , TOMURA TAKASHI , TSUJI SHINTARO
IPC分类号： F01D17/24
摘要： PROBLEM TO BE SOLVED: To restrain load variation at the time of a valve test, by installing a limitter, for restricting a correcting valve closing direction speed to a normal plant load-pressure correcting signal, to restrain the load dropping at the time of testing valve closing action, in a device equipping a valve action test circuit for testing the closing action of a principal control valve. SOLUTION: In the case where closing action is tested one by one about four valves 44-47 by a principal valve action test circuit 201, at first, an opening directive value 104 is sent to the governing valve 44 by a CV $1 valve control circuit, to execute a valve closing test. Since variation is caused in a flow rate at this time, in a flow rate lowering compensating circuit 90, a switch is closed, and deviation, between a steam flow rate from a steam flow rate directing part and an actual flow rate, is calculated by a subtractor, and this resultant deviation value is gain-adjusted by an adjustor, to correct correcting quantity 38 by a correction signal lowering direction change ratio limitter 80. Modified correcting quantity 81 is outputted to an adder, and a signal from the steam flow rate directing part is added to the correcting quantity 81, moreover signals 101-103, before a directive value, wherein functions 71-73 are multiplied, are sent to the governing valves 45-47.

2. 发明专利

JP2581610B2 失效
公开(公告)号：JP2581610B2
公开(公告)日：1997-02-12
申请号：JP24164390
申请日：1990-09-12
申请人： HITACHI LTD
发明人： TANI YUKISUMI , IWAMYA KENJI , MIURA YOICHIRO , YANAGIDA SADAO , IIJIMA TADAHIKO , ADACHI SHIGEKI
IPC分类号： G05B9/03

3. 发明专利

JPH0553921B2 失效
公开(公告)号：JPH0553921B2
公开(公告)日：1993-08-11
申请号：JP3025786
申请日：1986-02-14
申请人： HITACHI LTD
发明人： IIJIMA TADAHIKO , KAWAI TAKUMI , YANAGIDA SADAO , ISHIKAWA TOSHOSHI , IKEDA HIROSHI
IPC分类号： F01D19/00 , F01D17/00

4. 发明专利

JPH04183904A TURBINE CONTROLLER 失效
公开(公告)号：JPH04183904A
公开(公告)日：1992-06-30
申请号：JP31335390
申请日：1990-11-19
申请人： HITACHI LTD
发明人： SUZUKI KANTA , YANAGIDA SADAO , IIJIMA TADAHIKO
IPC分类号： F01D17/24
摘要： PURPOSE:To control a turbine with a load limiter independently from system frequency when the system frequency is varied largely so that the stable output of a generator can be supplied to the system by providing a means for inputting a load command signal directly to the load limiter in an electric cam circuit. CONSTITUTION:When a signal from a central current supply command is separated in system separation to control a turbine with a load limiter 54, a contact (a-b) of a load limiter drive selecting relay 203 is turned on and a load control command signal outputted from a load control command 201 is inputted directly to the load limiter 54. An output signal of the load limiter 54 is inputted to a low value selecting circuit 57. Also, a contact (c-d) of a governor motor selecting relay 202 is turned on, and an operational position of a governor motor 4 is controlled with a follow-up width set value set by a load following-up width setting circuit 51 and predetermined speed for the load limiter on the basis of the deviation of the output signal of the load limiter 54 as a feedback value and a governor motor position signal detected a position of the governor motor 4 by a differential transformer 204 respectively inputted to a third comparator 207 from the follow-up width set value set by a load follow-up setting circuit 51.

5. 发明专利

JPH0128202B2 失效
公开(公告)号：JPH0128202B2
公开(公告)日：1989-06-01
申请号：JP9225981
申请日：1981-06-17
申请人： HITACHI LTD
发明人： IIJIMA TADAHIKO , PPONDA NAGANOBU , KUWAJIMA HIDESUMI
IPC分类号： F01D17/20 , F01D19/00 , F01D25/12

6. 发明专利

JPS62258104A TURBINE CONTROL DEVICE 失效
公开(公告)号：JPS62258104A
公开(公告)日：1987-11-10
申请号：JP10097886
申请日：1986-05-02
申请人： HITACHI LTD
发明人： YANAGIDA SADAO , SUZUKI KANTA , KAWAI TAKUMI , IIJIMA TADAHIKO
IPC分类号： F01D17/20
摘要： PURPOSE:To make it possible to set a desired follow-up range, by furnishing a load control automatic follow up circuit and a selection circuit to select the lower side value of the output signal of the follow-up circuit and the secondary speed relay signal. CONSTITUTION:This steam turbine control system has a governor mechanism consisting of a governor 1, a load controller 6,a speed relay 9, and the like. The system also has an electric cam device 50 to input the output of a differential transformer 61 to detect the secondary speed relay 9 position, which is the control signal of the governor mechanism, and a servo valve 63 and an adjustable valve 101 to convert the adjustable valve property compensation signal, that is an electric signal, into a hydraulic signal. In this case, the electric cam device 50 is composed by furnishing a lower value selecting circuit 57 to select the lower side value of the secondary speed relay position and the load control signal, a circuit 58 for the adjustable valve property compensation, a servo amplifier 59 to compare and compute the cam circuit signal and an adjustable valve opening signal by a differential transformer 62, and the like.

7. 发明专利

JPS62189303A CHANGEOVER DEVICE FOR SPEED GOVERNING SYSTEM 失效
公开(公告)号：JPS62189303A
公开(公告)日：1987-08-19
申请号：JP3025786
申请日：1986-02-14
申请人： HITACHI LTD
发明人： IIJIMA TADAHIKO , KAWAI TAKUMI , YANAGIDA SADAO , ISHIKAWA TOSHIYOSHI , IKEDA HIROSHI
IPC分类号： F01D19/00 , F01D17/00
摘要： PURPOSE:To prevent load fluctuation at the time when a speed governing system is changed over by providing a means for converting an opening command for each steam governing valve so that steam quantity passing through the each steam governing valve may change at the same ratio before and after changing over the speed governing system for a steam turbine. CONSTITUTION:A command sent from a speed governing system changeover command circuit 12 activates a changeover driving circuit 11 to make change over ratio signal generators 9, 10 deliver the changeover ratio signals, which are then inputted in multipliers 5alpha1, 5alpha2, 5beta1, 5beta2. A load command LR sent from a basic control means 1 is inputted in the each multiplier through means for converting load and valve opening 2alpha, 3alpha, 2beta, 3beta and means for converting valve opening and flow rate 4alpha1, 4alpha2, 4beta1, 4beta2. Thus, the opening of a steam governing valve at the time when the speed governing system is changed over is controlled on a signal generated in each multiplier. Load fluctuation at the time when the said system is changed over can be therefore prevented.

8. 发明专利

JPS58144608A VALVE SWITCHING CONTROL SYSTEM FOR MULTIPLE SWITCHING TYPE TURBINE CONTROL DEVICE 失效
公开(公告)号：JPS58144608A
公开(公告)日：1983-08-29
申请号：JP2612982
申请日：1982-02-22
申请人： HITACHI LTD
发明人： IIJIMA TADAHIKO
IPC分类号： F01D17/24 , F01D17/10 , F01D21/14
摘要： PURPOSE:To enable to actuate a standby line that remains inoperative to return even while a valve is being switched, by a construction wherein a multiple control system is employed for a control valve adapted to regulate flow rate of steam, and a standby line is provided for estimating a condition under which the control valve is switched, and thereby utilizing a signal thus estimated as an initial signal by a line adapted to instruct the valve switching sequence. CONSTITUTION:A control device adapted to control a steam regulating valve which is provided intermediately in a steam pipe line through which steam generated by a boiler is introduced into a turbine is provided with a multiple line including a line for giving a driving signal to the valve and at least one standby line. The standby line is designed to obtain a signal 40 that is an estimated instruction of total valve opening amount in a sequence such that the standby line takes up data concerning an actual load MW, turbine's actual speed Nf and opening amount Cp of the regulating valve, and the actual load Mw is added to the difference between the actual speed Nf and the rated speed NR divided by a speed regulation rate delta. Arrangement is also made such that a function generator 43 that is a reciprocating function of regulating valve bias generator (not shown) may generate a signal 44 equivalent to the time passed after the valve switching instruction is started, with basis on a signal 42 that is obtained by substracting the signal 42 from the opening amount 41 of the regulating valve.

9. 发明专利

JPH06146807A TURBINE CONTROL DEVICE 失效
公开(公告)号：JPH06146807A
公开(公告)日：1994-05-27
申请号：JP29679692
申请日：1992-11-06
申请人： HITACHI LTD
发明人： TERAKADO KAZUYUKI , IIJIMA TADAHIKO
IPC分类号： F01D17/24 , F01D21/00
摘要： PURPOSE:To prevent a control action from turning into an unstable state in a device which changes the quantity of flowing in steam to control the speed up of a turbine by, even in the case of the existance of a steam flow rate dead zone resulting from backrash and friction, detecting the dead zone and correcting it to make characteristic between a command for steam quantity and the flow rate of steam linear. CONSTITUTION:The speed detector 15 of a turbine control device 22 detects the rotating speed of a turbine to output an actual speed signal N, and an acceleration computer 51 therefore obtains an actual acceleration (a). A target acceleration setting up apparatus 50 sets up an objective acceleration a0, and deviation obtained by a comparing section 52 is inputted into a proportional-plus-integral computer 53 to obtain a steam flow rate command value EL. A bias generator 54, a comparator 55 and a switch 56 are additionally provided in the computer 53, and when the steam flow rate command value EL enters the range of a dead zone, the correction for adding the bias is carried out by an adder 57 to produce steam flow rate command value E'L, which is inputted into a valve opening converter 58. Thus, even if a steam flow rate dead zone at the time of speed up control exists in the characteristic of a valve, stable speed up control can be carried out.

10. 发明专利

JPH04120601A CONTROLLING SYSTEM FOR MULTIPLEX CONTROLLER 失效
公开(公告)号：JPH04120601A
公开(公告)日：1992-04-21
申请号：JP24164390
申请日：1990-09-12
申请人： HITACHI LTD
发明人： TANI YUKIZUMI , IWAMIYA KENJI , MIURA YOICHIRO , YANAGIDA SADAO , IIJIMA TADAHIKO , ADACHI SHIGEKI
IPC分类号： G05B9/03
摘要： PURPOSE:To multiplex common process input-output processors so as to improve the reliability of a multiplex controller controlling system when the controlling system is operated for purposes other than the normal loaded operation by inputting/outputting common process signals after switching the controller used for the input-output of the signals to one controller selected out of multiplex controllers. CONSTITUTION:The inputting/outputting process of common process input-output signal is made by means of one controller selected out of triplex controllers (1-1)-(1-3) and, at the same time, a switching circuit 23 is provided so that the common process input-output signals can be inputted/outputted by switching the controller to one of the controllers (1-1)-(1-3). Accordingly, when one of the controllers (1-1)-(1-3) becomes faulty, the input-output of the common process input-output signals can be performed through another normal controller. Therefore, multiplex common process input-output processors are substantially realized and the reliability of this multiplex controller controlling system is improved when the controlling system is used for purposes other than the normal loaded operation, such as actuation control, etc.

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