JP2009180188A - Multiplexed steam-turbine control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiplexed steam-turbine control system by which even though a failure occurs in a multiplexed pressure controller, no disturbance is caused in the control. <P>SOLUTION: A pressure setting device 22 of each triple pressure controller includes the following devices an median selector 8A which obtains a median pressure-deviation signal out of three pressure-deviation signals P23A, P23B, P23C of the triple pressure controller, a coefficient multiplexer 11A which multiplies by a coefficient a pressure-deviation difference signal obtained by diminishing a pressure-deviation signal in the self-system from a median pressure-deviation signal obtained by the median selector 8A, and an integrator 225A which integrates additional signals of an output of the coefficient multiplier 11A and pressure setting increase/decrease signals to output the value as a pressure-setting signal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a multiplexed steam turbine control device that controls a steam turbine by controlling opening / closing of a steam control valve using a triple pressure detector and a triple pressure control device.

  For example, a multiplexed steam turbine control device includes a pressure detector that detects the turbine inlet steam pressure and a pressure control device that controls the steam pressure flowing into the steam turbine, respectively.

  FIG. 8 is a configuration diagram illustrating an example of a turbine control device in which a pressure detector and a pressure control device are tripled. The steam generated by the steam generator 1002 is guided to the steam turbine 1005 through the main steam stop valve 1003 and the steam control valve 1004, and the generator 1006 is driven by the steam turbine 1005. The main steam stop valve 1003 is fully closed when the turbine is stopped, and fully opened while the turbine is operating. Further, the steam control valve 1004 adjusts the amount of steam flowing into the steam turbine 1005 by adjusting the valve opening degree of the steam control valve 1004 based on the opening command signal V1001 from the turbine control device 1001. The steam turbine 1005 generates a turbine output corresponding to the amount of steam inflow, and generates power by a generator 1006 directly connected to the turbine rotation shaft. The steam that has flowed into the steam turbine 1005 and finished work is discharged to a condenser (not shown).

  Pressure detectors 1A, 1B, and 1C are installed on the inlet side of the main steam stop valve 1003. The reason why the three pressure detectors 1A, 1B, and 1C are installed is to support multiplexing of the pressure control devices 2A, 2B, and 2C. The three pressure detectors 1A, 1B, 1C are the same type of detector. The turbine control device 1001 includes triple pressure control devices 2A, 2B, and 2C, an intermediate value selector 3, and a steam valve control device 4. The pressure signals P1A, P1B, and P1C detected by the pressure detectors 1A, 1B, and 1C are respectively input to the pressure control devices 2A, 2B, and 2C in parallel with three signals.

  The pressure control devices 2A, 2B, and 2C are devices of the same type, and are tripled to ensure control reliability. The pressure control devices 2A, 2B, and 2C perform control such that the pressure signals P1A, P1B, and P1C detected by the pressure detectors 1A, 1B, and 1C become a predetermined pressure. Pressure control signals V21A, V21B, and V21C from the respective pressure control devices 2A, 2B, and 2C are input to the intermediate value selector 3, and an intermediate value signal of the three signals is output as V1 to control the steam valve. Input to device 4. The steam valve control device 4 outputs an opening command signal V1001 for adjusting the opening of the steam control valve 1004.

  FIG. 9 is a detailed configuration diagram of the turbine control device 1001 and shows the internal configuration of the pressure control devices 2A, 2B, and 2C in detail. Since the pressure control devices 2A, 2B, and 2C have the same configuration, the internal configuration of the pressure control devices 2A, 2B, and 2C will be described on behalf of the pressure control device 2A. The pressure signals P1A, P1B, and P1C detected by the pressure detectors 1A, 1B, and 1C are input to the intermediate value selector 21A of the pressure control device 2A, and a signal corresponding to the intermediate value among these three signals is selected. And output to the adder 23A as the intermediate value pressure signal P21A. The adder 23A also receives a pressure setting signal P22A from the pressure setter 22A.

  The pressure setter 22A sets the pressure setting signal P22A. FIG. 10 is a configuration diagram of the pressure setting device 22A. The pressure setter 22A includes a signal generator 221A for increasing the pressure setting signal P22A and a signal generator 222A for decreasing the pressure setting signal P22A. The pressure setting signal P221A for increasing the setting from the signal generator 221A is input to the terminal a of the switch 223A. Similarly, the set pressure decrease signal P222A from the signal generator 222A is input to the terminal a of the switch 224A.

  The switch 223A connects the terminal a and the terminal c when the setting increase of the terminal D is ON. In this case, the set increase / decrease signal P223A, which is an output signal, becomes P221A. Further, when the setting increase of the terminal D is OFF, the terminals a and c are in an open state and the output is 0. Similarly, the switch 224A connects the terminal a and the terminal c when the setting reduction of the terminal D is ON. In this case, the set increase / decrease signal P223A, which is an output signal, becomes P222A. Further, when the setting reduction of the terminal D is OFF, the terminal a and the terminal c are in an open state and the output is 0. The set increase / decrease signal P223A is input to the integrator 225A, and a signal obtained by integration becomes the pressure setting signal P22A.

  In this way, the pressure setting signals P22A, P22B, and P22C set by the pressure setting devices 22A, 22B, and 22C of the pressure control devices 1A, 1B, and 1C, respectively, in the triple configuration are the intermediate value selectors shown in FIG. 5 and the obtained intermediate value signal P2 is displayed on the display 6 and used as a pressure setting indicator for the operator.

  The pressure setting signal P22A obtained by the pressure setter 22A is input to the adder 23A, and the adder 23A obtains a pressure deviation signal P23A obtained by subtracting the pressure setting signal P22A from the intermediate value pressure signal P21A. The pressure deviation signal P23A is input to the coefficient unit 24A, and the signal multiplied by the coefficient by the coefficient unit 24A becomes the pressure control signal V21A. Here, the setting of the coefficient unit 24A determines how much the steam control valve opening is opened with respect to the pressure deviation signal P23A, and is generally referred to as a pressure regulation rate. The setting coefficient is set to a relatively large coefficient (in this example, 50 times) in order to make the pressure deviation amount of the normal control as small as possible.

  The pressure control signals V21A, V21B, and V21C obtained by the pressure control devices 1A, 1B, and 1C having the triple configuration are input to the intermediate value selector 3, and an intermediate value signal among the three signals is expressed as V1. And input to the steam valve control device 4. The steam valve control device 4 outputs an opening command signal V1001 for adjusting the opening of the steam control valve 1004.

  Here, as a limiter method of the triple integral signal, when the integral signal output of the own digital control device deviates from the intermediate value of each integral signal of the triple digital control device, the own integral signal output Is limited to an intermediate value ± α (see, for example, Patent Document 1).

  As a triple integral signal tracking method for tracking an integral signal of a triple digital control device, the output of the integral signal of the own digital control device is shifted from the intermediate value of each integral signal of the triple digital device. In some cases, the output of the integration signal of the own digital control device is tracked to an intermediate value. (For example, refer to Patent Document 2).

Further, as the intermediate value selection circuit, a control signal output from each of the tripled first to third control circuits is input, an intermediate value selector that outputs the intermediate value of these three inputs, and the control signal A bias signal generator that outputs a bias signal corresponding to a maximum value or a minimum value of a preset control allowable value, and first to third that operate when an abnormality occurs in the first to third control circuits. Abnormality detection relays, first to third switching relays that switch the output signal of the corresponding control circuit in response to the operation of the abnormality detection relay to a bias signal and input to the intermediate value selector, and the first to third switching relays Some switching relays include a logic circuit that blocks the operation of the other two switching relays on condition that one of the switching relays operates first (see, for example, Patent Document 3).
JP 63-108401 A JP-A-63-108403 Japanese Patent Publication No. 5-63801

  However, in the prior art, the pressure detectors 1A, 1B, and 1C are the same detector, but actually have a detection error. The pressure control devices 2A, 2B and 2C have recently been constituted by digital control devices, and an analog pressure signal is converted into an analog / digital converter and taken into the device. However, there are also conversion errors. is doing. These errors differ depending on the performance of each of the pressure controllers 2A, 2B, and 2C having a triple structure.

  Assuming that the pressure setting signal P22A = P22B = P22C is equal in the state where the pressure signal P21A after the capture is 100.5%, P21B is 100.0%, and P21C is 99.5%, Assuming that the pressure control signal V21B is 100%, V21A is 125% and V21C is 75%, which outputs a signal having a difference obtained by multiplying the error between them by a factor.

  In this state, if the pressure control device 2A fails and the pressure control signal V21A becomes 0%, the intermediate value signal V1 changes from the previous V21B signal 100% to 75% of the V21C signal. As a result, the steam control valve opening is rapidly reduced, and the amount of steam flowing into the turbine is reduced, so that the turbine output is rapidly reduced. Thereafter, the steam generated in the steam generator and the turbine inflow steam become unbalanced, so that the pressure signals P1A, P1B, P1C increase and the pressure control signals V21B, V21C increase, so the steam control valve opening increases. It becomes stable at a certain value. Thus, the turbine output greatly fluctuates during the time from the failure of the control device to the stable point.

  Further, in Patent Documents 1 and 2, in a multiplex control system having an integrator in a closed loop of a process control system, saturation of a non-selection system integrator is limited in the output of the integrator, or correction (tracking) is performed. In the proportional process control system, there is no attempt to correct the output imbalance of the multiplexing control system caused by the input error between the multiplexing of the process signals.

  Patent Document 3 tries to continue the control safely with the remaining two systems when one system of the triple signal becomes abnormal, and the detector error and capture error are multiplied by a coefficient. In a state where the deviation between the three control devices is large, it is not possible to prevent disturbance to the control due to the abnormality of the system selected as the intermediate value.

  An object of the present invention is to provide a multiplexed steam turbine control device that does not cause disturbance in the control even when a failure occurs in the multiplexed pressure control device.

  The multiplexed steam turbine control device of the present invention is a pressure deviation between an intermediate value of three turbine inlet steam pressure signals obtained by a triple pressure detector and a pressure set value set in the pressure setter. A triple pressure control device that multiplies the signal by a coefficient and outputs a pressure control signal, and the steam control valve is opened and closed based on an intermediate value of three pressure control signals from the triple pressure control device. In the multiplexed steam turbine control device including the steam valve control device for controlling, the pressure setter of each of the triple pressure control devices is one of the three pressure deviation signals of the triple pressure control device. An intermediate value selector for obtaining an intermediate value pressure deviation signal, a coefficient unit for multiplying a pressure deviation difference signal obtained by subtracting the pressure deviation signal of the own system from the intermediate value pressure deviation signal obtained by the intermediate value selector, Coefficient output and pressure setting increase / decrease Integrating the addition signal and characterized by comprising an integrator for outputting a pressure setting signal.

  According to the present invention, it is possible to provide a multiplexed steam turbine control device that does not cause disturbance in control even when a failure occurs in the multiplexed pressure control device.

(First embodiment)
FIG. 1 is a configuration diagram of an example of a pressure control device of a multiplexed steam turbine control device according to a first embodiment of the present invention. Although the multiplexed steam turbine control device of the present invention has three pressure control devices 2A, 2B, and 2C, since the pressure control devices 2A, 2B, and 2C have the same configuration, in FIG. A system pressure control device 2A is illustrated.

  In FIG. 1, the pressure control device 2A according to the first embodiment of the present invention is provided by adding an intermediate value selector 8A, an adder 9A, and a coefficient unit 11A to the pressure setter 22A shown in FIG. It has been. The same elements as those in FIGS. 9 and 10 are denoted by the same reference numerals, and redundant description is omitted.

  The pressure deviation signals P23A, P23B, and P23C of the triple pressure control device are input to the pressure setting device of the pressure control device. That is, the three pressure deviation signals P23A, P23B, and P23C are also input to the pressure setter 22A of the A system pressure controller 2A shown in FIG. The three pressure deviation signals P23A, P23B, and P23C are input to the intermediate value selector 8A of the pressure setter 22A, and the intermediate value selector 8A is an intermediate value that is an intermediate value of the three pressure deviation signals P23A, P23B, and P23C. The value pressure deviation signal P71A is output to the adder 9A.

  The adder 9A outputs a deviation signal P72A obtained by subtracting the intermediate value pressure deviation signal P71A from the pressure deviation signal P23A of the system to the coefficient unit 11A. The deviation signal P72A is multiplied by a coefficient by the coefficient unit 11A and is output to the adder 12A as a correction signal P74A. The coefficient setting of the coefficient unit 11A is set to a coefficient value as high as possible so that the imbalance suppression control between the triples can be stably performed. Adder 12A adds correction signal P74A to setting increase / decrease signal P223A, and outputs corrected setting increase / decrease signal P75A to integrator 225A. The integrator 225A integrates the corrected set increase / decrease signal P75A to obtain a pressure setting signal P22A and outputs it to the adder 23A.

  As a result, the adder 23A obtains a pressure deviation signal P23A obtained by subtracting the pressure setting signal P22A from the intermediate value pressure signal P21A obtained by the intermediate value selector 21A, and outputs the pressure deviation signal P23A to the coefficient unit 24A. The pressure control signal V21A is multiplied by the coefficient by the device 24A.

  As described above, with reference to a signal corresponding to the intermediate value of the triple pressure deviation signals P23A, P23B, and P23C, a correction signal (P74A, P74B, P74C) is used for a system that is different from the intermediate value signal. Is added and integrated by the integrator 225A. Thereby, the triple pressure deviation signals P23A, P23B, and P23C are equal to each other.

  That is, since the balance control is performed by the pressure setting signals P22A, P22B, and P22C so that the triple pressure deviation signals P23A, P23B, and P23C become equal values, any one of the multiplexed pressure control devices 2A, 2B, and 2C is used. Even if a failure occurs, no disturbance will occur in the control. Therefore, the turbine output does not fluctuate.

  FIG. 2 is a configuration diagram of another example of the pressure control device of the multiplexed steam turbine control device according to the first embodiment of the present invention. In another example, a dead zone device 10A is additionally provided between the adder 9A and the coefficient unit 11A in the example shown in FIG. The same elements as those in the example shown in FIG.

  As shown in FIG. 2, a dead zone device 10A is provided between the adder 9A and the coefficient unit 11A. The dead zone 10A outputs zero when the pressure deviation difference signal P72A obtained by subtracting the pressure deviation signal P23A of the own system from the intermediate value pressure deviation signal P71A obtained by the intermediate value selector 8A is smaller than the predetermined range, and from the predetermined range. Is larger, the pressure deviation difference signal P23A is output. FIG. 3 is a characteristic diagram showing an example of the characteristic of the dead zone 10A. As shown in FIG. 3, the dead zone device 10 </ b> A has a characteristic that the output becomes zero when the input signal is within a certain range.

  In this way, when the signal corresponding to the intermediate value of the triple pressure deviation signals P23A, P23B, and P23C is used as a reference, the signal of the system that is different from the intermediate value signal exceeds the dead band setting range. Are added with correction signals (P74A, P74B, P74C) and integrated by an integrator 225A. As a result, correction is made so that the triple pressure deviation signal is balanced among the triples.

  The dead zone 10A is installed to prevent fluctuations in equilibrium control due to differences in calculation timing of the triple pressure control device and fluctuations due to unnecessary balance control with a minute error value, and corresponds to the dead zone 10A. Even if there is an imbalance, the turbine output fluctuation is set to be small.

  According to the first embodiment, since the balance control is performed by the pressure setting signal so that the triple pressure deviation signals P23A, P23B, and P23C become substantially equal, a failure occurs in any of the multiplexed pressure control devices. Even in this case, there is no disturbance in the control. Therefore, the fluctuation of the turbine output does not occur. Further, when the dead zone 10A is provided, unnecessary fluctuation due to the balance control does not occur.

(Second Embodiment)
FIG. 4 is a configuration diagram of an example of a pressure control device of a multiplexed steam turbine control device according to the second embodiment of the present invention. In the second embodiment, a pressure setting signal correction unit 13A is added to the conventional pressure control device shown in FIG. The second embodiment also has three pressure control devices 2A, 2B, and 2C. Since the pressure control devices 2A, 2B, and 2C have the same configuration, the A system is representative in FIG. 2A is shown. The same elements as those in FIG. 9 are denoted by the same reference numerals, and redundant description is omitted.

  The pressure deviation signals P23A, P23B, and P23C of the triple pressure control devices 2A, 2B, and 2C are input to the pressure setting devices 22A, 22B, and 22C of the pressure control devices 2A, 2B, and 2C. That is, the three pressure deviation signals P23A, P23B, and P23C are also input to the pressure setting signal correction unit 13A of the A-system pressure control device 2A illustrated in FIG. The three pressure deviation signals P23A, P23B, and P23C are input to the intermediate value selector 8A of the pressure setting signal correction unit 13A. The intermediate value selector 8A outputs an intermediate value pressure deviation signal P71A, which is an intermediate value among the three pressure deviation signals P23A, P23B, and P23C, to the adder 9A.

  The adder 9A outputs a deviation signal P72A obtained by subtracting the intermediate value pressure deviation signal P71A from the pressure deviation signal P23A of the system to the coefficient unit 11A. The deviation signal P72A is multiplied by a coefficient by the coefficient unit 11A and is output to the integrator 14A as a correction signal P74A. The coefficient setting of the coefficient unit 11A is set to a coefficient value as high as possible so that the imbalance suppression control between the triples can be stably performed.

  The integrator 14A integrates the correction signal P74A and outputs it as an integration correction signal P131A to the adder 15A. The adder 15A adds the pressure setting signal P22A from the pressure setting device 22A and the integral correction signal P131A, and outputs a corrected pressure setting signal P132A. And it outputs to the adder 23A.

  Accordingly, the adder 23A obtains a pressure deviation signal P23A obtained by subtracting the corrected pressure setting signal P132A from the intermediate value pressure signal P21A obtained by the intermediate value selector 21A, and outputs the pressure deviation signal P23A to the coefficient unit 24A. The coefficient is multiplied by the coefficient unit 24A to become the pressure control signal V21A.

  As described above, correction signals (P74A, P74B, P74C) are added to the system in which a difference is generated with reference to a signal corresponding to the intermediate value of the triple pressure deviation signals P23A, P23B, P23C. Then, the correction signal integrated by the integrator 14A is added to the pressure setting signal. As a result, the triple pressure deviation signals P23A, P23B, and P23C have the same value.

  That is, since the correction signal is added to the pressure setting signal so that the triple pressure deviation signals P23A, P23B, and P23C have the same value, a failure occurs in any of the multiplexed pressure control devices. However, since no disturbance occurs in the control, the turbine output does not fluctuate.

  FIG. 5 is a configuration diagram of another example of the pressure control device of the multiplexed steam turbine control device according to the second embodiment of the present invention. In another example, a dead zone device 10A is additionally provided between the adder 9A and the coefficient unit 11A in the example shown in FIG. The same elements as those in the example shown in FIG.

  As shown in FIG. 5, a dead zone device 10A is provided between the adder 9A and the coefficient unit 11A. The dead zone device 10A outputs zero when the pressure deviation difference signal P72A obtained by subtracting the pressure deviation signal P23A of the own system from the intermediate value pressure deviation signal P71A obtained by the intermediate value selector 8A is smaller than the predetermined range. If greater than, a pressure deviation difference signal P72A is output.

  As described above, when the signal corresponding to the intermediate value of the triple pressure deviation signals P23A, P23B, and P23C is used as a reference and the signal of the system that is different from this signal exceeds the dead band setting range, A correction signal obtained by integrating the correction signals (P74A, P74B, P74C) by the integrator 14A is added to the pressure setting signal, so that the triple pressure deviation signal is corrected so as to be balanced between the triples.

  Note that the dead zone 10A is installed to prevent fluctuations in equilibrium control due to differences in calculation timing of the triple pressure control device and fluctuations due to unnecessary balance control with minute error values, and corresponds to the dead zone. Even if there is an imbalance of minutes, the turbine output fluctuation is set to be small.

  According to the second embodiment, any one of the multiplexed pressure control devices can be realized by correcting the pressure setting signal so that the triple pressure deviation signals P23A, P23B, and P23C are substantially equal to each other and performing balanced control. Even if a crab failure occurs, no disturbance occurs in the control, so that the turbine output does not fluctuate. In addition, since the dead zone 10A is provided, unnecessary fluctuation due to balance control does not occur.

(Third embodiment)
FIG. 6 is a configuration diagram of an example of a pressure control device of a multiplexed steam turbine control device according to the third embodiment of the present invention. In the third embodiment, a limited integrator 16A is provided instead of the integrator 14A, and a signal detector 17A is additionally provided in the pressure control device of the second embodiment shown in FIG. It is a thing. The same elements as those in FIG. 4 are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 6, a correction signal P74A, which is an output signal of the coefficient unit 11A, is input to the limited integrator 16A. The limited integrator 16A has an output limiting function so that the integrated output value of the correction signal P74A does not exceed a predetermined value, and limits the integrated signal due to the error of the pressure signal that can normally occur. Further, the output signal P131A of the limited integrator 16A is output to the signal detector 17A, and the signal detector 17A determines whether or not the output signal P131A of the limited integrator 16A is restricted by the integration limit signal. When the output signal P131A of the integrator 16A with restriction is limited to the integration restriction signal, an alarm signal P133A is outputted and outputted to an alarm device (not shown) to inform the operator that an abnormal state has occurred.

  As described above, correction signals (P74A, P74B, P74C) are added to the system in which a difference is generated with reference to a signal corresponding to the intermediate value of the triple pressure deviation signals P23A, P23B, P23C. Since the correction signal integrated by the limited integrator 16A is added to the pressure setting signal, the triple pressure deviation signals P23A, P23B, and P23C have the same value. Further, when an abnormal signal that restricts the limited integrator 16A is generated, an alarm signal is output to notify the operator.

  That is, the correction signal is added to the pressure setting signal so that the triple pressure deviation signals P23A, P23B, and P23C have the same value, so that control can be performed when one of the multiplexed pressure control devices fails. Does not cause disturbance. Therefore, the turbine output does not fluctuate, and the operator can recognize when an abnormal correction control state occurs, so that appropriate measures can be taken early.

  FIG. 7 is a configuration diagram of another example of the pressure control device of the multiplexed steam turbine control device according to the third embodiment of the present invention. In another example, a dead zone device 10A is additionally provided between the adder 9A and the coefficient unit 11A in the example shown in FIG. The same elements as those in the example shown in FIG.

  As shown in FIG. 7, a dead zone device 10A is provided between the adder 9A and the coefficient unit 11A. The dead zone device 10A outputs zero when the pressure deviation difference signal P72A obtained by subtracting the pressure deviation signal P23A of the own system from the intermediate value pressure deviation signal P71A obtained by the intermediate value selector 8A is smaller than the predetermined range. If greater than, a pressure deviation difference signal P72A is output.

  As described above, when the signal corresponding to the intermediate value of the triple pressure deviation signals P23A, P23B, and P23C is used as a reference and the signal of the system that is different from this signal exceeds the dead band setting range, A correction signal obtained by integrating the correction signals (P74A, P74B, P74C) by the limited integrator 16A is added to the pressure setting signal to correct the triple pressure deviation signal so that it is balanced between the triple signals.

  The dead zone 10A is installed to prevent fluctuations in equilibrium control due to differences in calculation timing of the triple pressure control device and fluctuations due to unnecessary balance control with a minute error value, and corresponds to the dead zone 10A. Even if there is an imbalance, the turbine output fluctuation is set to be small. Further, when an abnormal signal that restricts the limited integrator 16A is generated, the signal detector 17A operates to output an alarm signal to notify the operator.

  According to the third embodiment, since the pressure setting signal is corrected and balanced control is performed so that the triple pressure deviation signals P23A, P23B, and P23C are substantially equal, any one of the multiplexed pressure control devices. Even if a failure occurs, no disturbance occurs in the control. Therefore, the fluctuation of the turbine output does not occur. Further, when the dead zone 10A is provided, unnecessary fluctuation due to the balance control does not occur. In addition, when an abnormal correction control state is entered, the operator can recognize and take appropriate measures.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram of an example of the pressure control apparatus of the multiplexing steam turbine control apparatus concerning the 1st Embodiment of this invention. The block diagram of another example of the pressure control apparatus of the multiplexing steam turbine control apparatus concerning the 1st Embodiment of this invention. The characteristic view which shows an example of the characteristic of a dead zone in the 1st Embodiment of this invention. The block diagram of an example of the pressure control apparatus of the multiplexing steam turbine control apparatus concerning the 2nd Embodiment of this invention. The block diagram of another example of the pressure control apparatus of the multiplexing steam turbine control apparatus concerning the 2nd Embodiment of this invention. The block diagram of an example of the pressure control apparatus of the multiplexed steam turbine control apparatus concerning the 3rd Embodiment of this invention. The block diagram of another example of the pressure control apparatus of the multiplexing steam turbine control apparatus concerning the 3rd Embodiment of this invention. Configuration diagram showing an example of a conventional turbine control device in which a pressure detector and a pressure control device are tripled The detailed block diagram of the conventional turbine control apparatus. The block diagram of the pressure setting device in the conventional turbine control apparatus.

Explanation of symbols

1A, 1B, 1C: Pressure detector, 2A, 2B, 2C: Pressure control device, 3, 5, 8A, 21A: Intermediate value selector, 4: Steam valve control device, 6: Display, 9A, 12A, 15A , 23A: adder, 10A: dead zone, 11A, 24A: coefficient unit, 13A: pressure setting signal correction unit, 14A, 225A: integrator, 16A: limited integrator, 17A: signal detector, 22A: pressure setting , 221A, 222A: Signal generator, 223A, 224A: Switch, 1001: Turbine controller, 1002: Steam generator, 1003: Main steam stop valve, 1004: Steam control valve, 1005: Turbine, 1006: Generator

Claims (6)

  The pressure control signal is obtained by multiplying the pressure deviation signal between the intermediate value of the three turbine inlet steam pressure signals obtained by the triple pressure detector and the pressure set value set in the pressure setter by a coefficient. Multiplex provided with a triple pressure control device for outputting and a steam valve control device for opening / closing the steam control valve based on an intermediate value of three pressure control signals from the triple pressure control device In the steam turbine control device, the pressure setter of each of the triple pressure control devices selects an intermediate value for obtaining an intermediate value pressure deviation signal among the three pressure deviation signals of the triple pressure control device A coefficient multiplier that multiplies the pressure deviation difference signal obtained by subtracting the pressure deviation signal of the own system from the intermediate value pressure deviation signal obtained by the intermediate value selector, and the output of the coefficient unit and the pressure setting increase / decrease signal. Integrate the sum signal and Multiplexing the steam turbine control device characterized by comprising an integrator for outputting Te.   The pressure control signal is obtained by multiplying the pressure deviation signal between the intermediate value of the three turbine inlet steam pressure signals obtained by the triple pressure detector and the pressure set value set in the pressure setter by a coefficient. Multiplex provided with a triple pressure control device for outputting and a steam valve control device for opening / closing the steam control valve based on an intermediate value of three pressure control signals from the triple pressure control device In the steam turbine control device, the pressure setter of each of the triple pressure control devices selects an intermediate value for obtaining an intermediate value pressure deviation signal among the three pressure deviation signals of the triple pressure control device And when the pressure deviation difference signal obtained by subtracting the pressure deviation signal of the system from the intermediate value pressure deviation signal obtained by the intermediate value selector is smaller than the predetermined range, it outputs zero, and when it is larger than the predetermined range, the pressure deviation No output of differential signal A band, a coefficient multiplier that multiplies the signal obtained in the dead band, and an integrator that integrates an output signal of the coefficient multiplier and a pressure setting increase / decrease signal and outputs the result as a pressure setting signal. A multiplexed steam turbine control device characterized by the above.   The pressure control signal is obtained by multiplying the pressure deviation signal between the intermediate value of the three turbine inlet steam pressure signals obtained by the triple pressure detector and the pressure set value set in the pressure setter by a coefficient. Multiplex provided with a triple pressure control device for outputting and a steam valve control device for opening / closing the steam control valve based on an intermediate value of three pressure control signals from the triple pressure control device In the steam turbine control device, each of the triple pressure control devices includes an intermediate value selector for obtaining an intermediate value pressure deviation signal among the three pressure deviation signals of the triple pressure control device, A coefficient multiplier that multiplies the pressure deviation difference signal obtained by subtracting the pressure deviation signal of the own system from the intermediate value pressure deviation signal obtained by the value selector, and an integral signal obtained by integrating the output of the coefficient multiplier as a pressure setting correction signal. The integrator that outputs as Multiplexing the steam turbine control device characterized by comprising an addition to the adder to output a corrected pressure setting signal pressure setting correction signal of said integrator to a pressure set value from the setting device.   The pressure control signal is obtained by multiplying the pressure deviation signal between the intermediate value of the three turbine inlet steam pressure signals obtained by the triple pressure detector and the pressure set value set in the pressure setter by a coefficient. Multiplex provided with a triple pressure control device for outputting and a steam valve control device for opening / closing the steam control valve based on an intermediate value of three pressure control signals from the triple pressure control device In the steam turbine control device, each of the triple pressure control devices includes an intermediate value selector for obtaining an intermediate value pressure deviation signal among the three pressure deviation signals of the triple pressure control device, When the pressure deviation difference signal obtained by subtracting the pressure deviation signal of the own system from the intermediate value pressure deviation signal obtained by the value selector is smaller than the predetermined range, zero is output, and when it is larger than the predetermined range, the pressure deviation difference signal is output. The dead band and the front A coefficient multiplier that multiplies the signal obtained in the dead zone, an integrator that integrates the output of the coefficient multiplier and outputs an integrated signal as a pressure setting correction signal, and the integrator to the pressure set value from the pressure setter A multiplex steam turbine control apparatus comprising: an adder that adds the pressure setting correction signals of the two and outputs a corrected pressure setting signal.   The pressure control signal is obtained by multiplying the pressure deviation signal between the intermediate value of the three turbine inlet steam pressure signals obtained by the triple pressure detector and the pressure set value set in the pressure setter by a coefficient. Multiplex provided with a triple pressure control device for outputting and a steam valve control device for opening / closing the steam control valve based on an intermediate value of three pressure control signals from the triple pressure control device In the steam turbine control device, each of the triple pressure control devices includes an intermediate value selector for obtaining an intermediate value pressure deviation signal among the three pressure deviation signals of the triple pressure control device, A coefficient multiplier that multiplies the pressure deviation difference signal obtained by subtracting the pressure deviation signal of the own system from the intermediate value pressure deviation signal obtained by the value selector, and the output of the coefficient multiplier is integrated so as not to output more than a predetermined value. Integral signal limited to A limited integrator that outputs as a signal, an adder that adds the pressure setting correction signal of the limited integrator to the pressure setting value from the pressure setter and outputs a corrected pressure setting signal, and the limited integration And a signal generator for outputting an alarm signal when the integration signal of the generator is limited.   The pressure control signal is obtained by multiplying the pressure deviation signal between the intermediate value of the three turbine inlet steam pressure signals obtained by the triple pressure detector and the pressure set value set in the pressure setter by a coefficient. Multiplex provided with a triple pressure control device for outputting and a steam valve control device for opening / closing the steam control valve based on an intermediate value of three pressure control signals from the triple pressure control device In the steam turbine control device, each of the triple pressure control devices includes an intermediate value selector for obtaining an intermediate value pressure deviation signal among the three pressure deviation signals of the triple pressure control device, When the pressure deviation difference signal obtained by subtracting the pressure deviation signal of the own system from the intermediate value pressure deviation signal obtained by the value selector is smaller than the predetermined range, zero is output, and when it is larger than the predetermined range, the pressure deviation difference signal is output. The dead band and the front A multiplier that multiplies the signal obtained in the dead zone, a limited integrator that outputs, as a pressure setting correction signal, an integrated signal that is integrated so that the output of the coefficient unit is integrated and is not output beyond a predetermined value; and An adder that adds the pressure setting correction signal of the limited integrator to the pressure setting value from the pressure setting device and outputs a corrected pressure setting signal, and an alarm when the integration signal of the limited integrator is limited A multiplexed steam turbine control device comprising a signal generator for outputting a signal.

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