JP2009191715A - Turbine control valve control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turbine control valve control device capable of avoiding a resonance phenomenon or an excess hydraulic pressure pulsation in a high pressure oil line caused by control signal fluctuation of a turbine control valve without damaging the response speed of the turbine control valve. <P>SOLUTION: When a high frequency component included in an opening requirement signal of the turbine control valve is determined as being equal to or more than a prescribed value by a high frequency component determination means 41 and generator output is determined as being equal to or more than a prescribed value by a generator output determination means 27, an output switch means 42 selects the opening requirement signal of the turbine control valve passing through a band pass filter 22, and selects the opening requirement signal of the turbine control valve not passing though the band pass filter 22 at a time other than this, and outputs it to a control means 43. The control means 43 drives the opening of the turbine control valve based on the opening requirement signal of the turbine control valve selected by the output switch means 42. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a turbine control valve control device that controls a turbine control valve that adjusts the flow rate of a working fluid that drives a turbine.

  For example, in a steam turbine that obtains expansion work by flowing a high-pressure working fluid (main steam), an electrohydraulic control device is used for control of the steam turbine. In the electrohydraulic control device, the flow rate command signal of the regulating valve is calculated by an internal arithmetic circuit based on input signals such as the turbine speed, the generator load driven by the turbine, and the main steam pressure flowing into the turbine. Is converted into an increase / decrease valve opening signal to determine the opening command.

  On the other hand, in the turbine of a gas turbine facility that obtains work by inflating fuel after flowing in with the working fluid, similarly, the inside of the turbine control valve control device is based on input signals such as exhaust temperature and working fluid pressure. The flow rate command signal of the control valve is calculated by this arithmetic circuit and converted into a control valve opening signal to determine the opening command.

  Hereinafter, the case of a steam turbine will be described. In the case of a steam turbine, the control valve is an adjusting valve, and a signal obtained by multiplying the deviation between the adjusting valve opening command signal and the actual opening feedback signal from the hydraulic cylinder (oil cylinder) for on-site valve driving is a servo. It becomes the input signal of the valve. As a result, the supply and discharge of high-pressure oil to the control valve hydraulic cylinder is controlled by switching the port inside the servo valve that is driven, and the control valve opening is determined.

  In general, the servo valve is installed at the high pressure oil supply inlet to the hydraulic cylinder in association with the hydraulic cylinder. This is for the purpose of improving the response of the hydraulic cylinder, that is, the adjusting valve. The advantage of the servo valve is that it has a high gain and is excellent in accuracy and responsiveness. On the other hand, since the tracking is too good, there is a problem that it can respond to a noise component that is present in the control signal.

  In order to satisfy the demand for overspeed suppression control at the time of load interruption due to the increase in turbine capacity in recent years and the demand for higher speed and high accuracy control in speed / load / pressure tracking control, etc. It is indispensable to apply an electrohydraulic control device using a servo valve. If the control signal fluctuates at a high frequency, it has been pointed out that a resonance phenomenon or excessive hydraulic pulsation occurs in the high-pressure oil line due to the response of the servo valve. The possibility of servo valve damage increases.

  In order to prevent this, it has been proposed to provide a mechanical accumulator in the high-pressure oil system or to provide a signal filter on the electric control device side. In addition, there is a type in which a high-frequency cut filter is inserted into the steam control valve opening request signal line of the turbine control valve control device to attenuate the output signal and suppress the movement of the servo valve to suppress hydraulic pulsation ( For example, see Patent Document 1).

  FIG. 6 is a configuration diagram of a conventional electrohydraulic control device in which a mechanical accumulator is provided in the immediate vicinity of a control valve hydraulic cylinder of a steam turbine so as to have a hydraulic buffer damping effect. The steam generated by the steam generator 1 is guided to the turbine 2 after passing through the main steam stop valve 5 and the control valve 6. Then, by performing expansion work with the turbine 2, the generator 7 is driven and condensed with the condenser 3 to become condensate. This condensate is returned to the steam generator 1 by the feed water pump 4 to constitute a steam cycle. The rotational speed of the turbine 2, the load of the generator 7 driven by the turbine 2, and the main steam pressure are opened by the open / close valve 6. Determined by degree.

  The opening degree of the adjusting valve 6 is controlled by an opening degree request signal that has been arithmetically processed inside the control valve control device 14. The control valve control device 14 is inputted with the rotation speed signal measured by the rotation speed measuring device 15, the load signal measured by the generator output measuring device 16, and the steam pressure signal measured by the main steam pressure measuring device 17. In addition, the actual opening feedback signal measured by the adjusting valve opening detector 9 is input. The control valve control device 14 performs arithmetic processing based on these signals, guides a control signal created to the servo valve 10, thereby operating the servo valve 10 to inflow / outflow of high pressure oil to the control valve hydraulic cylinder 8. To control. Thereby, the opening degree of the regulating valve 6 is determined as the position of the regulating valve hydraulic cylinder 8.

  This high-pressure oil is supplied from the oil pressure generator 11 at a remote position to the servo valve 10 and the adjusting valve hydraulic cylinder 8 via the high-pressure oil pipe 13 by the high-pressure oil pump 12, and an accumulator 35 is provided in the vicinity of the hydraulic cylinder. is set up.

  In general, a rotation speed signal, a load signal, a pressure signal, and the like, which are input signals to the control valve control device 14 have a minute disturbance fluctuation component including the influence of those measuring instruments. When the variable component is added and the servo valve 10 responds to this, the supply and discharge amount of the high-pressure oil fluctuates, and when this fluctuation frequency resonates with the natural frequency of the high-pressure oil piping system, Although there is a possibility of excessive pressure pulsation, the accumulator 35 is provided to suppress the pressure pulsation growth by its pressure buffering action.

  FIG. 7 is a block diagram of a conventional control valve control device 14. The control valve control device 14 receives, as input signals, a generator output signal, a rotation speed signal, and a main steam pressure signal from a generator output measurement device 16, a rotation speed measurement device 15, and a main steam pressure measurement device 17, respectively. The Based on these signals, the control signal calculation generator 19 of the control valve control device 14 creates a steam flow signal necessary for controlling the control amount to a predetermined set value.

  This required flow rate signal is converted into a required opening signal of the adjusting valve 6 by the opening conversion function generator 20, but for this adjusting valve opening request signal a, for example, the cut-off frequency f0 is set to about 5 Hz. High-frequency components are removed by passing through the set band-pass filter 22.

  FIG. 8 is a waveform diagram of the control valve opening request signal before and after passing through the band-pass filter 22 of the conventional control valve control device 14. The control valve opening request signal a1 after passing through the bandpass filter 22 has a high-frequency component removed from the control valve opening request signal a before passing through the bandpass filter 22. The control valve opening request signal a1 after passing through the filter is guided to the difference calculator 30, and after calculating the deviation Δa from the valve opening detector 9 and the feedback signal a2 demodulated by the demodulator 32, the deviation Δa is calculated. The servo valve 10 is driven by a signal that has been amplified by the operational amplifier 31.

  By performing such processing, the servo valve 10 is driven by the control signal after removing the high frequency fluctuation component included in the input signal detection system of the control valve control device 14 as noise. For this reason, it will operate | move in which the high frequency operation | movement which becomes the origin of the pressure pulsation of a high pressure oil system | strain was suppressed, and the effect similar to a mechanical accumulator can be anticipated.

In general, when the size of the turbine 1 is increased, the distance from the hydraulic pressure generator 11 to the control valve 6 is increased, and the natural frequency with respect to pressure pulsation in the high-pressure oil piping system is reduced. In addition, since the inevitable noise of several Hz to several tens of Hz is generally added to the rotation speed signal and pressure signal that are the basis of the control signal, the natural frequency of the high-pressure oil piping system is reduced. If it is, it will approach the fluctuation frequency of such noise. For this reason, even if the fluctuation level of the noise is small, it tends to resonate with the fluctuation frequency, and a large pressure pulsation occurs. Therefore, the importance of the avoidance technique as described above is further increased.
JP-A-6-248904

  However, in order to install the mechanical accumulator 35 in the conventional system, engineering is performed individually for each model with different hydraulic cylinder structure / size and piping route in terms of capacity, number, and installation position optimization. Therefore, it is not easy to carry out the examination work including the effect evaluation after installation. In addition, since hardware is installed, the cost is high and the installation space needs to be considered. Furthermore, it is necessary to consider maintenance for periodic filling pressure management and oil leakage management.

In addition, as shown in Patent Document 1, in the case where a band-pass filter is always inserted in the control circuit, the effect of the control response speed of the transient valving valve is suppressed by the effect. Although it is effective for signals, normal operation is not necessary when high-speed responsiveness is required for the operation of the adjusting valve in order to suppress overspeed, such as when a load is interrupted. In plants where main steam pressure control is performed prior to the load control operation of the steam turbine by adjusting valves, even if pressure control based on requests from the reactor side is necessary based on minute pressure fluctuations, minute pressure The opening degree control will not be performed according to the change,
Furthermore, although the high-speed tracking control is necessary, it is disadvantageous that the band-pass filter functions so that tracking cannot be performed. That is, it is desirable that the band-pass filter is activated only when it is necessary, and it is not necessary to always operate.

  An object of the present invention is to provide a turbine control valve control device capable of avoiding a resonance phenomenon and excessive hydraulic pulsation that occur in a high pressure oil line due to fluctuations in the control signal of the turbine control valve without adversely affecting the response speed of the turbine control valve. Is to provide.

  A turbine control valve control device according to the present invention includes an opening request signal calculating means for calculating an opening request signal of a turbine control valve for adjusting a flow rate of a working fluid that drives a turbine, and an opening request signal of the turbine control valve. Driven by the turbine, a band-pass filter that removes the high-frequency component contained in the high-frequency component, a high-frequency component determination means that determines whether or not the high-frequency component contained in the opening request signal of the turbine control valve is greater than or equal to a predetermined value A generator output determining means for determining whether or not the output of the generator is greater than or equal to a predetermined value; In some cases, an opening request signal of the turbine control valve that has passed through the bandpass filter is selected, and in other cases, the turbine control valve that does not pass through the bandpass filter is selected. Output switching means for selecting and outputting a valve opening request signal, and control means for driving the opening of the turbine control valve based on the opening request signal of the turbine control valve selected by the output switching means It is characterized by that.

  According to the present invention, it is possible to avoid the resonance phenomenon and excessive hydraulic pulsation that occur in the high-pressure oil line due to fluctuations in the control signal of the turbine control valve without adversely affecting the response speed of the turbine control valve.

  FIG. 1 is a configuration diagram of a turbine control valve control device according to a first embodiment of the present invention. The turbine control valve control device 14 includes an opening degree request signal calculation means 40, a band pass filter 22, a high frequency component determination means 41, a generator output determination means 27, an output switching means 42, and a control means 43. Has been.

  The opening request signal calculating means 40 calculates an opening request signal of a turbine control valve that adjusts the flow rate of the working fluid that drives the turbine, and the control signal generator 19 of the opening request signal calculating means 40 includes As an input signal, a generator output signal from the generator output measuring device 16, a rotation speed signal from the rotation speed measuring device 15, and a main steam pressure signal from the main steam pressure measuring device 17 are input. Based on these signals, the control signal generator 19 creates a steam flow signal necessary for controlling these control amounts to a predetermined set value, and outputs the steam flow rate signal to the opening degree conversion function generator 20. The opening degree conversion function generator 20 converts the necessary steam flow rate signal obtained by the control signal generator 19 into a required opening degree signal of the adjusting valve 6. These required flow rate signals and required opening signals are calculated when the generator output signal, the rotation speed signal, and the main steam pressure signal, which are input signals of the turbine control valve controller 14, have pulsation (noise) components. Even after passing through, the pulsation is added and added.

  Therefore, the opening degree request signal obtained by the opening degree conversion function generator 20 is guided to the band pass filter 22 to cut off a component having a frequency f0 or more which becomes a problem as noise. The cut-off frequency f0 is set in advance to 5 Hz, for example. In the following description, it is assumed that the preset value is 5 Hz or 5%, for example.

  Here, output switching means 42 is provided between the opening degree conversion function generator 20 and the bandpass filter 22. The output control means 42 has a contact point 28 and a contact point 29, and selects whether or not the opening request signal passes through the band-pass filter 22 by switching the contact point 29.

  The opening request signal obtained by the opening conversion function generator 20 is also input to the high frequency component determination means 41. The high frequency component determination means 41 determines whether the high frequency component contained in the opening request signal of the turbine control valve is equal to or greater than a predetermined value.

The opening degree request signal obtained by the opening degree conversion function generator 20 is input to the bandpass filter 21 and the difference calculation means 23 of the high frequency component determination means 41.

  The cut-off frequency f0 of the band-pass filter 21 is also set to 5 Hz like the band-pass filter 22, and a component having a frequency f0 or more that is problematic as noise is cut. The difference calculation means 23 calculates the difference between the opening request signal output from the opening conversion function generator 20 and the opening request signal that has passed through the band-pass filter 21, and calculates only the fluctuation component. A signal obtained by rectifying the fluctuation signal into a direct current by the direct current converter 24 is guided to a contact operation comparator 25 with a latch, and is compared with a signal from the threshold value setting unit 26. The contact 29 is operated. The threshold value of the fluctuation component amplitude level set in the threshold setting device 26 is 5%.

  The output switching means 42 has a contact 28 in the middle of the operation signal line in addition to the contact 29. This contact 28 is a contact that is closed only when the load signal from the generator output measuring device 16 exceeds a certain value and the generator output determining means 27 is operated. The generator output determination means 27 determines whether or not the output of the generator driven by the turbine is greater than or equal to a predetermined value, and closes the contact 28 when the output of the generator is greater than or equal to a predetermined value.

  Thus, the output switching means 42 is configured to control the turbine through the band-pass filter 22 when the high-frequency component included in the turbine control valve opening request signal is equal to or greater than a predetermined value and the generator output is equal to or greater than a predetermined value. A valve opening request signal is selected, and otherwise, an opening request signal for a turbine control valve that does not pass through the bandpass filter 22 is selected and output to the control means 43.

  The control means 43 drives the opening of the turbine control valve based on the opening request signal of the turbine control valve selected by the output switching means 41, and opens the turbine control valve selected by the output switching means 41. After calculating the deviation request signal to the difference calculator 30 and calculating a deviation from the feedback signal demodulated by the demodulator 32 from the valve opening detector 9, the servo valve 10 is a signal obtained by calculating and amplifying the deviation by the operational amplifier 31. Drive. Thereby, the opening request signal is controlled only when the fluctuation component of 5 Hz or more and 5% or more exists in the signal itself, and the fluctuation component 6 is removed.

  According to the first embodiment of the present invention, when the opening request signal includes a fluctuation component of 5 Hz or more and 5% or more, the servo valve 10 is controlled by a signal obtained by removing the fluctuation component by the band-pass filter 22. Thus, it is possible to prevent excessive pressure pulsation in the high-pressure oil piping system caused by the flow rate fluctuation of the high-pressure oil resulting from the response operation of the servo valve 10 to the high frequency control signal. Further, in a state where a quick response is required such as a minute fluctuation control region within 5% or when the load is interrupted, the filter effect can be removed and the response can be followed.

  FIG. 2 is a configuration diagram of the electrohydraulic control device according to the second embodiment of the present invention. In addition to the conventional example shown in FIG. 6, a hydraulic pressure measuring device 18 for detecting the hydraulic pressure inside the hydraulic cylinder is additionally provided, and the hydraulic pressure inside the hydraulic cylinder detected by the hydraulic pressure measuring device 18 is input to the control valve control device 14. ing.

  FIG. 3 is a configuration diagram of a turbine control valve control device according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that the generator output measuring device 16 generates a generator output signal, the rotation speed measuring device 15 outputs a rotation speed signal, and the main steam pressure measuring device 17 outputs a main steam pressure. In addition to the signal, the hydraulic cylinder internal hydraulic pressure detected by the hydraulic pressure measuring device 18 is also input, and the high frequency determination means 41 replaces the high frequency component included in the opening request signal of the turbine control valve with the pulsating component of the hydraulic cylinder internal hydraulic pressure. Is used to determine whether or not the pulsation component of the hydraulic pressure inside the hydraulic cylinder is greater than or equal to a predetermined value, and the output switching means 42 is when the pulsation component of the hydraulic pressure inside the hydraulic cylinder is greater than or equal to a predetermined value and the generator output is greater than or equal to a predetermined value. Selects the opening request signal of the turbine control valve that has passed through the band-pass filter 22, and selects and outputs the opening request signal of the turbine control valve that does not pass through the band-pass filter 22 otherwise. Those were Unishi. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  The hydraulic pressure signal measured by the pressure measuring device 18 below the control valve hydraulic cylinder is input to the band pass filter of the high frequency determination means 41 and to the difference calculator 23. The difference calculator 23 obtains a difference between the hydraulic pressure signal measured by the pressure measuring instrument 18 and the signal after passing through the bandpass filter 21 to calculate a hydraulic pressure fluctuation component.

  This fluctuation signal is rectified to a direct current by the direct current converter 24 and guided to a contact operation comparator 25 with a latch. Then, the contact operation comparator with latch 25 is compared with the signal from the threshold setting device 26, and when the hydraulic pressure fluctuation component exceeds the threshold, the contact 29 of the output switching means 42 is operated.

  The setting of the cut-off frequency of the band-pass filter 21 and the band-pass filter 22 of the high-frequency determination unit 41 is 5 Hz as in the first embodiment. Further, the threshold value (the amplitude of the hydraulic pressure fluctuation component) of the threshold setting device 26 is set to about 50% of the rated hydraulic pressure equivalent signal.

  According to the second embodiment, when the opening request signal includes a fluctuation component of 5 Hz or more and a certain amplitude or more, the servo valve 10 responds to the supply / discharge oil flow rate to the hydraulic cylinder 8. Since the lower pressure of the hydraulic cylinder fluctuates due to the fluctuation, this is detected by the pressure detector 18 at the lower part of the hydraulic cylinder and guided to the control valve control device 14. In this case, since the opening request signal passes through the band-pass filter 22, the same effect as the first embodiment can be obtained.

  FIG. 4 is a configuration diagram of a turbine control valve control device according to the third embodiment of the present invention. In the third embodiment, in contrast to the first embodiment, the high frequency determination means 41 replaces the high frequency component included in the opening request signal of the turbine control valve with the opening of the hydraulic cylinder 8 and the hydraulic cylinder. When the fluctuation deviation from the drive command signal of the drive servo valve 10 is a predetermined value or more, the opening request signal of the turbine control valve through the band pass filter 22 is selected, and in other cases, the band pass filter 22 is selected. The opening request signal of the turbine control valve that is not passed is selected and output. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 4, the high frequency determination means 41 is provided with a low frequency cut band pass filter 33 instead of the high frequency cut band pass filter 21 in the first embodiment. The deviation signal after passing through the difference calculator 30 is branched and guided. The cut-off frequency f0 of the bandpass filter 33 is set to 5 Hz as with the bandpass filter 22.

  If there is a fluctuation component of 5 Hz or more in the control deviation signal guided to the band pass filter 33, this is rectified to direct current by the subsequent DC converter 24 and further guided to the contact operation comparator 25 with latch. When the threshold value from the threshold value setter 26 exceeds the threshold value, the contact 29 of the output switching means 42 is operated. The set value of the threshold setting device 26 is set to about 5% of the input full scale reference value of the operational amplifier 31.

  According to the third embodiment of the present invention, when the opening request signal includes a fluctuation component of 5 Hz or more and a certain amplitude or more, the hydraulic cylinder 8 responds to this until the servo valve 10 has a time constant. Because of its large size, it cannot respond to this. For this reason, the feedback signal that has passed through the demodulator 32 from the valve opening detector 9 does not fluctuate, and as a result, a fluctuation component is added to the deviation signal that has passed through the difference calculator 30, and this is detected. Then, the presence or absence of passage through the bandpass filter 22 is switched. Thereby, an effect equivalent to that of the first embodiment can be obtained.

  FIG. 5 is a configuration diagram of a turbine control valve control device according to the fourth embodiment of the present invention. The fourth embodiment is different from the first embodiment in that an output limiting limiter 39 is provided in place of the bandpass filter 22 and the output switching means 42 has a contact 34 instead of the contact 29. It is. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 5, the second stage of the difference calculator 30 is divided into two hands and has a switching contact 34 that is paired with ON and OFF, and an output limiter limiter 39 is provided on the line before the contact of the normal OFF side. Hold and merge after contact 34. The limit width of the output limit limiter 39 is about ± 5% of the input full scale reference value of the operational amplifier 31.

  The opening request signal of the opening conversion function generator 20 is input to the difference calculator 23 and the band pass filter 21. The difference calculator 23 calculates the deviation between the opening request signal from the opening conversion function generator 20 and the opening request signal that has passed through the bandpass filter 21, and the deviation is rectified and latched by the DC converter 24. Guided to the comparison setting unit 25. Then, the comparison setter 25 with latch is compared with the threshold set in the threshold setter 26, and the opening through the band-pass filter 21 and the opening request signal from the opening conversion function generator 20. When the deviation from the request signal exceeds the threshold value, the contact 34 of the output switching means 42 is operated.

  In the fourth embodiment, when an output limit limiter 39 is provided on the input signal line of the servo valve 10 and the opening request signal includes a fluctuation component of 5 Hz or more and a certain amplitude or more, the operation fluctuation range of the servo valve 10 is obtained. The flow rate fluctuation of the high pressure oil is suppressed by limiting the pressure. Therefore, as a result, an equivalent effect of suppressing the pressure pulsation of the high-pressure oil system can be obtained.

  In the above description, the insertion position of the bandpass filter 22 is the latter stage of the opening degree conversion function generator 20, but it is not necessary to specify this part, and the latter stage of the control signal calculation generator 19 or the servo valve 10 is not necessary. You may insert in the back | latter stage of the difference calculating unit 30 used as the input signal part.

  That is, when there are a plurality of turbine control valves and the opening command signal of each turbine control valve corresponds to the opening request signal obtained by dividing the entire flow request signal, the bandpass filter 22 It is provided in the signal line, the opening request signal line of each turbine control valve, or the drive signal input signal line of each turbine control valve. Similarly, for the output limit limiter 39, when there are a plurality of turbine control valves and the opening command signal of each turbine control valve corresponds to the opening request signal obtained by dividing the entire flow request signal, Provided on the drive signal input signal line of each turbine control valve.

  The generator output determining means 27 closes the contact 28 of the output switching means 42 when the generator output is equal to or greater than a predetermined value, but the output is output when the generator breaker is turned on. The contact 28 of the output switching means 42 may be opened when the contact 28 of the switching means 42 is closed and the breaker of the generator is opened. Thereby, in the case of load interruption, the control valve can be quickly controlled.

  Moreover, although the above description demonstrated the case of the adjustment valve of a steam turbine as a turbine control valve, it is also applicable to the fuel flow valve which is a control valve of the turbine of gas turbine equipment.

  According to the embodiment of the present invention, when a turbine control valve is controlled by an electrohydraulic control device using high-pressure oil, it is possible to remove a high-frequency fluctuation component contained in a control signal only when necessary. Become. For this reason, it is possible to maintain high-speed follow-up performance of the control valve and suppress control fluctuations at high frequencies and large amplitudes during normal control as well as when the load is interrupted or when minute pressure fluctuations are suppressed. This also avoids the resonance phenomenon and excessive pressure pulsation phenomenon of the high-pressure oil piping system, and can prevent damage to piping equipment and servo valves.

The block diagram of the turbine control valve control apparatus concerning the 1st Embodiment of this invention. The block diagram of the electrohydraulic control apparatus in the 2nd Embodiment of this invention. The block diagram of the turbine control valve control apparatus concerning the 2nd Embodiment of this invention. The block diagram of the turbine control valve control apparatus concerning the 3rd Embodiment of this invention. The block diagram of the turbine control valve control apparatus concerning the 4th Embodiment of this invention. The block diagram of the conventional electrohydraulic control apparatus which provided the mechanical accumulator in the immediate vicinity of the control valve hydraulic cylinder of the steam turbine, and had the buffer damping effect of the hydraulic pressure. Configuration diagram of conventional control valve control device The wave form diagram of the regulation valve opening request signal before and behind passage of the band pass filter of the conventional control valve control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Steam generator, 2 ... Turbine, 3 ... Condenser, 4 ... Feed water pump, 5 ... Main steam stop valve, 6 ... Control valve, 7 ... Generator, 8 ... Control valve hydraulic cylinder, 9 ... Valve opening degree Detector: 10 ... Servo valve, 11 ... Hydraulic pressure generator, 12 ... High pressure oil pump, 13 ... High pressure oil piping, 14 ... Control valve control device, 15 ... Speed measuring device, 16 ... Generator output measuring device, 17 ... Steam pressure measuring device, 18 ... Hydraulic cylinder lower pressure measuring device, 19 ... Control signal calculation generator, 20 ... Opening degree conversion function generator, 21 ... Band pass filter, 22 ... Band pass filter, 23 ... Difference calculator, 24 DESCRIPTION OF SYMBOLS ... DC converter, 25 ... Comparator for contact operation with a latch, 26 ... Threshold setting device, 27 ... Generator output determination means, 28 ... Contact, 29 ... Contact, 30 ... Difference calculator, 31 ... Operational amplifier, 32 ... demodulator, 33 ... bandpass filter, 34 ... Point, 35 ... accumulator, 39 ... output limit limiter 40 ... opening request signal calculation means, 41 ... high frequency component determining means, 42 ... output switching means, 43 ... control unit

Claims (7)

An opening request signal calculating means for calculating an opening request signal of a turbine control valve that adjusts a flow rate of a working fluid that drives a turbine, and a bandpass filter that removes a high frequency component contained in the opening request signal of the turbine control valve And high frequency component determination means for determining whether or not the high frequency component included in the opening request signal of the turbine control valve is greater than or equal to a predetermined value, and whether the output of the generator driven by the turbine is greater than or equal to a predetermined value A generator output determining means for determining whether or not a high-frequency component included in the turbine control valve opening request signal is equal to or greater than a predetermined value and the generator output is equal to or greater than a predetermined value; Selects the opening request signal for the control valve, otherwise selects the output request signal for the turbine control valve that does not pass through the bandpass filter and outputs it. Means and, turbine control valve control apparatus characterized by comprising a control means for driving the opening of the turbine control valve based on the opening request signal of the selected turbine control valve in said output switching means. When the turbine control valve is driven by a hydraulic cylinder, a hydraulic pressure measuring device is provided for detecting the hydraulic pressure inside the hydraulic cylinder, and the high frequency determination means is replaced with a high frequency component included in the opening request signal of the turbine control valve. The pulsation component of the hydraulic cylinder internal oil pressure is used to determine whether or not the pulsation component of the hydraulic cylinder internal oil pressure is greater than or equal to a predetermined value. When the generator output is greater than or equal to a predetermined value, the turbine control valve opening request signal through the bandpass filter is selected, and otherwise the turbine control valve opening through the bandpass filter is selected. The turbine control valve control device according to claim 1, wherein the request signal is selected and output. When the turbine control valve is driven by a hydraulic cylinder, the high frequency determination means replaces the high frequency component included in the turbine control valve opening request signal with the opening of the hydraulic cylinder and the hydraulic cylinder driving A turbine control valve opening request signal that has passed through the band-pass filter is selected when the variation deviation from the servo valve drive command signal is greater than or equal to a predetermined value, and the turbine that does not pass through the band-pass filter otherwise. 2. The turbine control valve control device according to claim 1, wherein an opening request signal for the control valve is selected and output. An opening request signal calculating means for calculating an opening request signal of the turbine control valve; a high frequency component determining means for determining whether or not a high frequency component included in the opening request signal of the turbine control valve is equal to or greater than a predetermined value; A generator output determining means for determining whether or not an output of a generator driven by the turbine is equal to or greater than a predetermined value, and a predetermined difference in which an opening request signal and an opening signal of the turbine control valve are set in advance. An output limit limiter that cuts the excess when the value exceeds the value, and an output limit limiter when the high-frequency component included in the opening request signal of the turbine control valve is equal to or greater than a predetermined value and the generator output is equal to or greater than the predetermined value The output switching means for selecting the difference between the opening request signal of the turbine control valve and the opening degree signal, and the signal selected by the output switching means. Turbine control valve control apparatus characterized by comprising a control means for controlling the opening degree of the control valve Te. When there are a plurality of turbine control valves and the opening command signal of each turbine control valve corresponds to the opening request signal obtained by dividing the entire flow request signal, the bandpass filter 4. The system according to claim 1, wherein the turbine control valve is provided in a line, an opening request signal line of each turbine control valve, or a drive signal input signal line of each turbine control valve. 5. Turbine control valve control device. When there are a plurality of turbine control valves and the opening command signal of each turbine control valve corresponds to the opening request signal obtained by dividing the entire flow request signal, the output limit limiter The turbine control valve control device according to claim 4, wherein the turbine control valve control device is provided in a drive signal input signal line of the valve. The turbine according to any one of claims 1 to 6, wherein a breaker of the generator is turned on instead of the generator output being a predetermined value or more. Control valve control device.

Images