JP3609450B2 - Intermediate steam valve control device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to steam valve control of a steam turbine of a nuclear power plant or a thermal power plant.
[0002]
[Prior art]
FIG. 13 shows an example of a steam turbine system in a thermal power plant.
[0003]
Steam generated by the steam generator 1 enters a steam control valve (hereinafter abbreviated as CV) 3 through a main steam stop valve 2 that is fully open during turbine operation, and is adjusted by the opening degree of this valve. The amount of steam that has entered the high-pressure turbine 4. Then, the steam that has finished work in the high-pressure turbine 4 enters the reheater 5, adds heat, enters an intermediate steam valve (hereinafter abbreviated as IV) 6, and the amount of steam adjusted by this valve enters the low-pressure turbine 7. Inflow. Then, the steam that has worked in the low-pressure turbine 7 is discharged to the condenser 8 and recovered into the condensate system.
[0004]
A generator 9 is directly connected to the shaft end of the low-pressure turbine 7, and the mechanical output obtained by the turbine is converted into an electrical output to supply electricity to the load 10. Further, a speed detector 4S for detecting a speed signal S2 proportional to the turbine speed is installed on the shaft end side of the high-pressure turbine 4. A pressure detector 4E for detecting a steam pressure value TP1 due to turbine exhaust proportional to the mechanical output of the turbine is installed at the outlet of the high-pressure turbine 4, and the generator load proportional to the load 10 is included in the output of the generator 9. A load detector 9G for detecting the value G1 is installed.
[0005]
An example of the control device in the steam turbine system described above is shown in FIG.
[0006]
First, in the opening degree command calculation unit 50, the speed obtained by subtracting the turbine speed signal S2 detected by the speed detector 4S from the reference speed setting signal S1 set by the turbine reference speed setter 11 by the adder 12. The deviation signal S3 is input to the CV coefficient unit 13 and the IV coefficient unit 16.
[0007]
The CV coefficient unit 13 sets how much the CV opening degree is adjusted with respect to the speed deviation signal S3, and this is called a CV speed regulation rate. In general, the speed deviation signal S3 is a rated turbine. The CV1 signal is output by setting the valve opening to change 100% at approximately 5% of the speed.
[0008]
The opening degree setter 14 is set by an operator so as to obtain a required turbine output. The opening degree set value P1 and the signal CV1 from the CV coefficient unit 13 are added by an adder 15 to obtain a CV. The opening command value CV2 is obtained. Then, the opening of CV3 is controlled to be equal to the CV opening command value CV2 by a CV opening adjusting circuit (not shown).
[0009]
On the other hand, in the case of the IV6 control, the IV coefficient unit 16 sets how much the IV opening is adjusted with respect to the speed deviation signal S3, and this is called the IV speed regulation rate. Generally, the signal IV1 is output by setting the speed deviation signal S3 to change the valve opening degree by 100% when the speed deviation signal S3 is approximately 2% of the rated turbine speed.
[0010]
The CV / IV coefficient unit 17 sets the coefficient ratio between the CV coefficient unit 13 and the IV coefficient unit 16, and 5% when the CV speed adjustment rate is 5% and the IV speed adjustment rate is 2%. ÷ 2% = 2.5 times multiplied by a coefficient value to output signal IV2. Further, the full open value setter 18 fixes the full open signal (100%) IV3. As a result, the signals IV1 and IV2 and the fully open signal IV3 are added by the adder 19 to become the IV opening command value IV4.
[0011]
Next, in the feedback control unit 51, the IV opening command value IV4 and the IV actual opening value IV5 detected by the valve opening detector 25 are input to the adder 20, and the deviation signal IV6 between them is input from the adder 20. Is output. The deviation signal IV16 is input to the amplifier 21, where a signal IV7 obtained by proportional amplification is input to the positive signal limiter 22. In this positive polarity signal limiter 22, the maximum value of the positive polarity signal is limited, and the rate of change in the opening direction of the valve opening is limited.
[0012]
Subsequently, the output IV8 of the positive polarity signal limiter 22 is input to the electric / hydraulic converter 23. The electric / hydraulic converter 23 converts the electric signal into the hydraulic pressure signal IV9, and when the electric signal is positive, the opening direction. On the other hand, in the case of the negative polarity, the hydraulic pressure signal IV9 is output in the closing direction by changing the valve opening / closing speed in proportion to the magnitude of the signal.
[0013]
Then, it is converted into a mechanical position signal IV10 by a valve actuator 24 driven by hydraulic pressure, and the opening degree of IV6 is adjusted.
[0014]
As a result, the closed loop control is performed by the feedback control unit 51 so that the deviation signals IV6 and IV7 become zero.
[0015]
On the other hand, in the valve rapid closing signal output unit 52, an electromagnetic valve built in the rapid closing operation device 29 is excited by a rapid closing electrical signal IV12 described later to rapidly fully close IV6.
[0016]
That is, the output signal IV7 of the amplifier 21 is input to the closing deviation detector 26. The IV opening command value IV4 is smaller than the IV actual opening value IV5, the output signal IV7 of the amplifier 21 is in the negative polarity direction, and the magnitude of the signal exceeds the rated maximum value of the electric / hydraulic converter 23. Then, a signal IV11 with a large closing deviation is output.
[0017]
Further, a pressure signal TP1 proportional to the turbine output detected by the pressure detector 4E shown in FIG. The sudden closing value detector 27 detects that the turbine output needs to cause the IV6 to be rapidly closed, and outputs a signal TP2. Then, the signal IV11 and the signal TP2 having a large closing deviation are calculated by the AND operator 28, and the sudden closing electric signal IV12 is inputted to the sudden closing operator 29, and the signal IV13 is outputted to the valve operator 24 and IV6. The opening of is rapidly fully closed.
[0018]
Here, the operation of IV6 will be described with reference to FIGS.
[0019]
First, when the opening setting value P1 output by the opening setting device 14 of FIG. 14 is constant at 100% (CV opening fully open equivalent value), as shown in FIG. The opening command value IV4 is fully open and constant, and the IV opening command value IV4 is changed to a closing direction from 105% or more of the turbine speed signal S2, and is fully closed at 107%. On the other hand, the CV opening command value CV2 becomes the closing direction from 100% of the turbine speed signal S2, and is fully closed at 105%.
[0020]
By the way, in general, the turbine speed is approximately ± 1% or less of the rating in synchronization with the power system, but when the generator is disconnected from the power system, the turbine speed is accelerated abnormally. In such an abnormal situation, the opening setting value P1 output by the opening setting device 14 is instantaneously set to zero. As shown in FIG. 16, when the turbine speed signal S2 increases slightly from 100%, the IV opening command value IV4 operates from the fully open value to the closing direction. And is fully closed when the turbine speed signal S2 is 102%.
[0021]
The above operation will be described in detail. As shown in FIG. 17, first, the opening degree set value P1 of the opening degree setter 14 is set to zero and the signal IV2 is also set as an adder on the assumption that the line is disconnected at time t1. 19 is input. For this reason, the IV opening command value IV4 starts abrupt closing. When the deviation between the IV opening command value IV4 and the IV actual opening value IV5 becomes 5% or more at time t2, the IV deviation command value IV4 is closed from the closing deviation detector 26. A large deviation signal IV11 is output to the AND operator 28 until time t3.
[0022]
In this state, since IV6 is closed, the pressure signal TP1 from the pressure detector 4E also rises, and the output signal TP2 from the sudden close value detector 27 also becomes an ON signal and is input to the AND operator 28. The Along with this, a sudden closing electric signal IV12 is outputted from the AND operator 28 to the sudden closing operator 29, a signal IV13 is outputted to the valve operator 24, and IV6 is suddenly closed, and the IV actual opening value IV5 is obtained at time t4. Fully closed.
[0023]
Thereafter, the IV opening command value IV4 becomes a fully closed signal at time t5, and when the time t6 is reached, the IV opening deviation value IV7 becomes -5% or more and is closed from time t6 to time t7. A signal IV11 with a large closing deviation is input from the deviation detector 26 to the logical product calculator 28, and IV6 is further closed.
[0024]
Eventually, when the rotational energy of the turbine reaches the top, the turbine speed signal S2 gradually decreases to 102% at time t8, and accordingly, the IV opening command value IV4 starts to increase, and the IV actual opening is increased. The value IV5 also shifts slightly in the opening direction.
[0025]
As described above, the IV opening command value IV4 rapidly decreases from the fully opened value in proportion to the rapid increase of the turbine speed signal S2, but the IV actual opening value IV5 does not rapidly decrease. This is because the electric / hydraulic converter 23 has a limited capacity. Therefore, in such a situation, the deviation value between the IV opening command and the actual IV opening increases in the negative polarity direction. Therefore, this state is detected by the closing deviation detector 26 (in this embodiment, the closing deviation output device). The detected value of 26 is set to -5%). With this signal, the quick closing operation device 29 is operated to rapidly close the valve.
[0026]
Further, when the generator load value instantaneously becomes zero when operating at a certain turbine output value, the detected value of the sudden closing value detector 27 is accelerated by the imbalance between the turbine output and the generator load. To do. In order to keep the maximum acceleration value below a specified value, the capability of the electric / hydraulic converter 23 alone is insufficient. For this purpose, it is common to operate the quick closing operation device 29 of the valve quick closing signal output unit 52 to detect a turbine output value or more and operate it with a change of usually several tens%.
[0027]
[Problems to be solved by the invention]
However, the intermediate steam valve control device shown in FIG. 14 has the following problems.
[0028]
First, there is a risk of a generator trip or the like when an IV rapid closing operation occurs in a low-power operation state of the turbine.
[0029]
Generally, in the multistage turbine including the high-pressure turbine 4 and the low-pressure turbine 7, the output sharing ratio becomes higher as the latter stage is reached. Although it is possible to sufficiently suppress turbine acceleration, there is the following problem.
[0030]
18 and 19, the turbine is operated in a low output state (5% output) (the opening setting value P1 of the opening setting device 14 is 5%), and the setting value of the sudden closing value detector 27 is the turbine output. The state of the control of IV6 with respect to the change of the turbine speed signal S2 when the conversion deviation is less than 5% and the detection of the closing deviation detector 26 is −5% is shown.
[0031]
As a result, as shown in FIG. 18, since the opening setting value P1 of the opening setting device 14 is 5%, the IV opening command value IV4 is 100% (fully opened when the turbine speed signal S2 exceeds 100.25%. ), And the characteristic becomes 0% (fully closed) at the point of 102.5%.
[0032]
When the turbine speed signal S2 starts to rise rapidly as shown in FIG. 19 (time t1), the IV opening command value IV4 rapidly decreases (time t2). On the other hand, the IV actual opening value IV5 cannot follow the IV opening command value IV4, and after a while, the closing deviation detector 26 outputs a closing error signal IV11 (time t3). IV6 is rapidly fully closed. (Time t4).
[0033]
As shown in FIG. 19, the IV actual opening value IV5 is fully closed even though the IV opening command value IV4 is reduced to at least 87.5%. This is because once the solenoid valve built in the quick-close actuator 29 is excited, the valve cannot be recovered from the halfway opening degree even if the excitation of the solenoid valve is released in order to ensure that the valve is fully closed. Because it is.
[0034]
In addition, the IV opening command value IV4 decreases rapidly to 87.5% and then rapidly recovers. On the other hand, the IV actual opening value IV5 has a slow recovery speed because of the positive signal limiter 22. This is also because the rate of change in the opening direction of the opening of IV6 is limited.
[0035]
Such an operation occurs only when the turbine speed is increased by at most 0.25% from the rated value. Therefore, it is not rare that the turbine speed (same as the power system frequency) generally has a rapid fluctuation of about ± 0.5 to 1% in a system with a small total capacity of the power system. It is very likely to occur.
[0036]
When the IV actual opening value IV5 is fully closed by such an IV rapid closing operation, the output of the low-pressure turbine 7 having a large turbine output sharing ratio is lost and the output value is abnormally reduced. There is a problem that a reverse power state in which power flows from the system side to the generator side may cause a generator trip due to activation of the generator protection function.
[0037]
In an operation with a high turbine output in which the opening set value P1 is increased from the opening setter 14, the IV opening command value IV4 starts to decrease from the fully open value, and the turbine speed value also increases. The IV rapid closing operation is less likely to occur, and the IV rapid closing operation is performed only at the time of an abnormal acceleration of the turbine speed at the time of an accident such as loss of the generator load.
[0038]
Secondly, there is a problem that the turbine speed does not settle easily due to repeated rapid closure of IV6 after the generator load is lost.
[0039]
This problem will be described with reference to an operational diagram of IV6 control after the generator load is lost from the turbine output 100% state shown in FIG.
[0040]
First, when the generator load is lost (time t1), the opening setting value P1 from the opening setting device 14 is set from 100% to 0%. For this reason, the IV opening command value IV4 becomes the closing direction when the turbine speed signal S2 rises even slightly from 100%, and the closing deviation detector 26 turns on the large closing deviation signal IV11 and passes through the AND operator 28. Then, the rapid closing operation device 29 is operated, and the opening degree of IV6 is fully closed (time t2).
[0041]
Although not shown in FIG. 20, the opening degree of CV3 is rapidly fully closed at a timing slightly earlier than the IV actual opening value IV5 is fully closed, and the steam inflow from the steam generator 1 to the high pressure turbine 4 is Disappear.
[0042]
On the other hand, since the IV actual opening value IV5 is fully closed, the residual steam that has passed so far stays between the outlet of the high-pressure turbine 4 and the inlet of the low-pressure turbine 7, so that the exhaust of the high-pressure turbine 4 is exhausted. The steam pressure value TP1 is not so lowered.
[0043]
Then, when the turbine speed signal S2 drops past the first peak and falls below the 102% speed (time t3), the IV opening command value IV4 starts to increase from 0% and the IV actual opening value IV5 also opens. First, since the rate of decrease in turbine speed at this time is relatively fast, it is limited to the valve opening direction change rate limit value by the positive polarity signal limiter 22.
[0044]
When the opening of IV6 is opened at this time, the steam staying between the outlet of the high-pressure turbine 4 and the inlet of the low-pressure turbine 7 flows into the low-pressure turbine 7 and is discharged to the condenser 8 to obtain the steam pressure value TP1. Decrease. However, since residual steam flows into the low-pressure turbine having a large turbine output sharing ratio, the turbine generates output, that is, the turbine speed increases again (time t4), and the IV opening command value IV4 is suddenly closed. The deviation detector 26 operates to perform the IV rapid fully closing operation (time t5).
[0045]
Thereafter, after the turbine speed passes the second peak, the speed decreases again, and the opening of IV6 starts to open again (time t6). At this time, since the residual steam is reduced, the turbine acceleration rate is small. Further, the signal IV11 having a large closing deviation is ON from time t8 to time t9. However, since the steam pressure value TP1 is equal to or lower than the sudden closing value detection setting, the rapid closing operation device 29 does not operate.
[0046]
In the above description, only the IV rapid closing operation is performed twice at time t1 and time t5. However, actually, the IV rapid closing operation is frequently performed after time t1 due to the inertia time constant of the turbine and the residual steam amount. This has the disadvantage that the turbine speed does not settle very easily.
[0047]
Accordingly, a first object of the present invention is to obtain a stable turbine output without unnecessarily suddenly closing the intermediate steam valve when the turbine speed fluctuates due to power system fluctuation that normally occurs in a normal turbine output operation state. In addition, for large turbine acceleration that occurs when the generator load is lost, the intermediate steam valve is suddenly closed to keep the turbine acceleration value below a specified value. This is to suppress the repeated rapid closing of the intermediate steam valve after the loss of the generator load, smoothly control the turbine speed by the intermediate steam valve, and set the turbine speed to the rated value at an early stage.
[0048]
[Means for Solving the Problems]
1st invention Group (Invention of Claims 1-7) Is an opening degree command calculation unit that calculates an opening degree command value of the intermediate steam valve based on a deviation speed signal obtained from the turbine speed signal and the reference speed setting signal, and an opening degree calculated by the opening degree command calculation unit A feedback control unit that controls the opening and closing of the intermediate steam valve via a valve actuator so that the actual opening value of the intermediate steam valve follows the command value, and a quick-close electrical signal in an emergency, separately from the control system of this feedback control unit An intermediate steam valve control device having a valve rapid closing signal output unit that outputs to the rapid closing operation device and rapidly closes the intermediate steam valve via the valve operation device. In this state, a means for preventing the sudden closing of the intermediate steam valve which is unnecessary in the normal turbine acceleration state is provided.
[0049]
Second invention Group (Inventions of Claims 8 and 9) Is an opening degree command calculation unit that calculates an opening degree command value of the intermediate steam valve based on a deviation speed signal obtained from the turbine speed signal and the reference speed setting signal, and an opening degree calculated by the opening degree command calculation unit A feedback control unit that controls the opening and closing of the intermediate steam valve via a valve actuator so that the actual opening value of the intermediate steam valve follows the command value, and a quick-close electrical signal in an emergency, separately from the control system of this feedback control unit In the intermediate steam valve control device having a valve rapid closing signal output unit that outputs to the rapid closing operation device and causes the intermediate steam valve to close rapidly via the valve operation device, the feedback control unit is configured to open the opening command value Means for limiting the open direction change rate of the signal based on the change rate or the deviation between the opening command value and the actual opening value by a limit value that increases or decreases according to the generator load value is provided.
[0050]
[Action]
1st invention Group (Invention of Claims 1-7) In normal turbine output operation conditions, stable turbine operation can be continued without performing the intermediate steam valve rapid closing operation, which is not necessary for turbine speed fluctuations caused by power system fluctuations that normally occur, and by reverse power protection operation at low output No generator trip occurs. Further, with respect to large turbine acceleration that occurs when the generator load is lost, the intermediate steam valve rapid closing operation can be performed as usual to suppress the turbine acceleration value to a specified value or less.
[0051]
Second invention Group (Inventions of Claims 8 and 9) Since the steam flow into the low-pressure turbine is gently performed during the restart operation of the intermediate steam valve after the generator load is lost, unnecessary turbine acceleration does not occur. For this reason, since the intermediate steam valve rapid closing operation is not repeated, the turbine speed control by the intermediate steam valve can be performed smoothly, and the turbine speed can be quickly set to the rated value.
[0052]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0053]
FIG. 1 is a block diagram of a control apparatus for an intermediate steam valve showing a first embodiment of the present invention.
[0054]
In FIG. 1, the same reference numerals as those in FIG. 14 showing the conventional example denote the same or corresponding parts, and the first embodiment differs from the valve quick closing signal output unit 52 shown in FIG. That is, the logical product calculator 28A is provided as the signal output unit 52A, and the IV command value detector 30 is additionally provided.
[0055]
The AND operation unit 28A outputs three ON signals: an output signal IV14 from the IV command value detector 30, a signal IV11 having a large closing deviation from the closing deviation detector 26, and an output signal TP2 from the sudden closing value detector 27. The quick closing operation device 29 is operated by a quick closing electric signal IV12 obtained by inputting a signal and establishing a logical product.
[0056]
The IV command value detector 30 receives the IV opening command value IV4 and outputs an output signal IV14 that becomes an ON signal when the IV opening command value IV4 becomes a predetermined value or less.
[0057]
With the above configuration, the operation setting of the IV command value detector 30 is set so as not to operate at the minimum output state of the turbine in operation and at the increase in turbine speed due to normal power system fluctuation. For example, in the operating state described in FIGS. 18 and 19 (minimum output 5%), when the maximum value of the normal turbine speed increase is 1%, the IV opening command value IV4 at the time of 1% increase is 62. 5%. Therefore, the output signal IV14 obtained by setting the operation setting of the IV command value detector 30 to be 62.5% or less to be an ON signal is input to the AND operator 28A.
[0058]
As a result, the output signal IV14 from the IV command value detector 30 is the OFF signal even when the turbine speed is suddenly increased by 1% and the large deviation signal IV11 becomes the ON signal. Never do.
[0059]
Thus, in the turbine acceleration state due to normal power system oscillation, the IV rapid closing operation is not performed, so that stable turbine output operation can be continued.
[0060]
Next, a second embodiment of the present invention will be described with reference to FIG.
[0061]
In FIG. 2, the same reference numerals as those in FIG. 1 showing the first embodiment denote the same or corresponding parts, and the second embodiment differs from the configuration of the valve quick closing signal output unit 52A in that the valve quick closing signal output is different. As the unit 52B, a closing deviation detector 26 and a sudden closing value detector 27 similar to those of the first embodiment are provided, and further, an AND operation unit 28B, a function setting unit 31, an adder 32, and a positive polarity signal detector 33 are provided. Provided.
[0062]
The function setting device 31 inputs the steam pressure value TP1 and outputs an output signal IV15 corresponding to the pressure value, and outputs a small value in a low pressure region and a large value in a high pressure region. .
[0063]
The adder 32 inputs the output signal IV15 and the IV opening command value IV4 from the function setting device 31, and outputs a deviation signal IV16 obtained by subtracting the IV opening command value IV4 from the output signal IV15. is there.
[0064]
The positive signal detector 33 receives the deviation signal IV16 and outputs an output signal IV17 that is turned on when the signal becomes positive.
[0065]
The AND operator 28B receives the three ON signals of the output signal IV17, the large deviation signal IV11 of the closing deviation detector 26, and the output signal TP2 of the sudden closing value detector 27, and the obtained ON signal is obtained. The quick closing operation device 29 is operated by the signal quick closing electric signal IV12.
[0066]
With the above configuration, the steam pressure value TP1 proportional to the turbine output is input to the function setter 31, and an output signal IV15 having the characteristics shown in FIG. 3 is output. The function setter 31 outputs 62.5% when the steam pressure value TP1 is in the turbine low pressure state, and is set to increase the function according to the high pressure from the medium pressure. The adder 32 compares the output signal IV15 from the function setting device 31 and the IV opening command value IV4. At this time, when the IV opening command value IV4 becomes smaller than the output signal IV15, the ON signal of the output signal IV17 obtained by being detected by the positive polarity signal detector 33 is input to the AND operator 28B.
[0067]
As a result, in the turbine low output state and normal turbine acceleration, the rapid closing operator 29 does not operate, and in the turbine acceleration in the turbine high output state, the operating point of the rapid closing operator 29 can be advanced. it can.
[0068]
In the first embodiment, the turbine speed is abnormally accelerated due to a large load sudden decrease such as loss of the generator load in a state where the turbine output is high, and the opening setting value is set by the opening setting device 14. When P1 is not set to zero, there is a possibility that the operation of the rapid closing operation device 29 is delayed and the turbine acceleration value cannot be suppressed below the specified value. For example, when the opening setting value P1 is 30% and the operation setting of the IV command value detector 30 is 62.5% or less, the turbine command is output from the IV command value detector 30 at the 102.25% point. The signal IV14 becomes an ON signal.
[0069]
When a generator load loss occurs with a large turbine output, the turbine acceleration value exceeds the specified value with a slight time delay unless the IV rapid closing operation is performed as soon as possible. In order to supplement the above, the operation setting value of the IV command value detector 30 of the first embodiment can be changed by the function setting device 31 according to the present embodiment in accordance with the turbine output state that was operating at that time.
[0070]
Thus, in normal turbine acceleration in a turbine low output state, the IV rapid closing operation is not performed, and stable turbine output operation can be continued. Further, in the turbine acceleration in the turbine high output state, the IV rapid closing operation point can be advanced.
[0071]
Next, a third embodiment of the present invention will be described with reference to FIG.
[0072]
In FIG. 4, the same reference numerals as those in FIG. 1 showing the first embodiment denote the same or corresponding parts, and the third embodiment differs from the first embodiment in the configuration of the valve quick closing signal output unit 52. A closing deviation detector 26 and a sudden closing value detector 27 similar to those of the first embodiment are provided. Further, an AND operation unit 28C, a function setting unit 31, an adder 32, a positive signal detector 33, and a dead time setting unit 34 are provided. And are provided.
[0073]
The function setter 31 inputs a signal IV18, which will be described later, and outputs an IV opening command detection value IV15 corresponding to the pressure value. The function setting device 31 outputs a small value in a low pressure region and a high value in a high pressure region. Output. The adder 32 inputs the output signal IV15 and the IV opening command value IV4 from the function setting device 31, and subtracts the IV opening command value IV4 from the output signal IV15 to output a deviation signal IV16. .
[0074]
The positive polarity signal detector 33 inputs the deviation signal IV16 and outputs a signal IV17 that is turned ON when the signal becomes positive polarity. The dead time setter 34 processes a predetermined dead time with respect to either the opening set value P1 or the generator load value G1 of the opening setter 14.
[0075]
The AND operator 28C is a sudden closing electric signal IV12 obtained by the establishment of three logical products of the output signal IV17, the closing deviation signal 26 of the closing deviation detector 26 and the output signal TP2 of the sudden closing value detector 27. Is output to the quick-close operating device 29.
[0076]
With the above configuration, either the opening setting value P1 of the opening setting device 14 or the generator load value G1 is input to the dead time setting device 34. The dead time setting unit 34 delays the input signal by a predetermined time and outputs a signal IV18. This signal IV18 is input to the function setter 31 and outputs an output signal IV15 having substantially the same characteristics as shown in the second embodiment.
[0077]
Then, the output signal IV15 and the IV opening command value IV4 are input to the adder 12, and a deviation signal IV16 obtained by subtracting the IV opening command value IV4 from the output signal IV15 by the adder 12 is output. The deviation signal IV16 is input to the positive signal detector 33, and an output signal IV17 that is turned on when the signal becomes positive is output.
[0078]
Next, three signals of the output signal IV17, the large deviation signal IV11 of the closing deviation detector 26, and the output signal TP2 of the sudden closing value detector 27 are input to the AND operator 28C, and obtained. The quick closing operation device 29 is operated by the quick closing electric signal IV12.
[0079]
The third embodiment is different from the second embodiment in that the value of the output signal IV15 is changed according to the opening set value P1 or the generator load value G1. The machine load value G1 is input to the dead time setter 34, and after a predetermined dead time has elapsed, the signal IV18 is output. At this time, the time until the generator load is lost, the turbine is accelerated, and the IV opening degree command is sufficiently closed is set as a dead time.
[0080]
Even when a generator load signal is input, the time is set in the dead time setter 34 in the manner described above. In general, when a generator load loss occurs when the turbine is in a high output state, the generator load loss state is detected and the opening setting value P1 is set to zero. This is because IV15 is calculated, and after the generator load is lost, the value is the same as that in the turbine low output state.
[0081]
The signal IV18 subjected to the dead time setting device 34 is input to the function setting device 31 set in the same manner as in the second embodiment, and an output signal IV15 is obtained. As a result, the IV rapid closing does not operate in normal turbine acceleration in the turbine low power state, and stable turbine power operation can be continued. Further, the IV rapid closing operation point can be advanced in the turbine acceleration in the turbine high output state.
[0082]
Next, a fourth embodiment of the present invention will be described with reference to FIG.
[0083]
In FIG. 5, the same reference numerals as those in FIG. 1 showing the first embodiment denote the same or corresponding parts. In the fourth embodiment, the valve quick closing signal output unit 52D is different in the configuration of the valve quick closing signal output unit 52. And a sudden closing value detector 27 similar to that of the first embodiment, and an AND operation unit 28D, a function setting unit 35, an adder 36, and a negative polarity signal detector 37.
[0084]
The function setting unit 35 inputs the steam pressure value TP1 and outputs a signal IV19 corresponding to the pressure value. The function setting unit 35 outputs a large value in a region where the steam pressure value TP1 is low, and in a region where the steam pressure value TP1 is high. , Which outputs a small value.
[0085]
The adder 36 inputs and adds the output signal IV19 from the function setting unit 35 and the IV opening deviation value IV7 from the amplifier 21, and outputs an addition signal IV20.
[0086]
The negative signal detector 37 receives the addition signal IV20 and outputs a signal IV21 that is turned on when the signal becomes negative.
[0087]
The AND operator 28D operates the quick closing operation device 29 using the ON signal obtained by inputting the two ON signals of the output signal TP2 and the signal IV21 as the quick closing electric signal IV12.
[0088]
With the above configuration, the steam pressure value TP1 is input to the function setter 35, and a signal IV19 corresponding to the pressure value is output. For example, as shown in FIG. 6, the function setting unit 35 outputs a large value in a low pressure region and outputs a small value in a high pressure region.
[0089]
When the signal IV19 and the IV opening deviation value IV7 are input to the adder 36, and the addition signal IV20 obtained by adding both is input to the negative polarity signal detector 37, the signal becomes negative. The signal IV21 that is turned on is output.
[0090]
Next, two signals of the signal IV21 and the output signal TP2 of the rapid closing value detector 27 are input to the logical product calculator 28, and the rapid closing operation device 29 is operated by the obtained output signal IV12.
[0091]
Although the operating point of the closing deviation detector 26 in the conventional example is a fixed value, the fourth embodiment is characterized in that the operating point changes according to the turbine output. That is, the steam pressure value TP1 proportional to the turbine output is input to the function setter 35, and the signal IV19 having the characteristics shown in FIG. 6 is output.
[0092]
As an example of this function setting method, in the operating state (output 5%) described in FIGS. 18 and 19, when the maximum value of the normal turbine speed increase is 1%, the IV opening at the time of 1% increase The command value IV4 is 62.5%. The signal is set to 37.5% (100−62.5 = 37.5%) on the assumption that the IV opening command value IV4 rapidly decreases and the IV opening cannot be followed.
[0093]
In addition, if the generator load is lost while the turbine output is large, the turbine acceleration value will exceed the specified value with a slight time delay unless the IV rapid closing operation is performed as soon as possible. Make it small and close early so that deviation detection is performed.
[0094]
In this way, in the normal turbine acceleration in the turbine low output state, the IV rapid closing does not operate, and the stable turbine output operation can be continued. Further, the IV rapid closing operation point can be advanced in the turbine acceleration in the turbine high output state.
[0095]
Next, a fifth embodiment of the present invention will be described with reference to FIG.
[0096]
In FIG. 7, the same reference numerals as those in FIG. 1 showing the first embodiment denote the same or corresponding parts. In the fifth embodiment, the valve quick closing signal output unit 52 is different from the valve quick closing signal output unit 52E. In addition, a sudden closing value detector 27 similar to that of the first embodiment is provided, and further, an AND operation unit 28E, a dead time setting unit 34, a function setting unit 35, an adder 36, and a negative polarity signal detector 37 are provided. ing.
[0097]
The dead time setter 34 processes a predetermined dead time with respect to either the opening set value P1 or the generator load value G1 from the opening setter 14.
[0098]
The function setting unit 35 outputs a large value when the signal IV22 is low and outputs a small value when the signal IV22 is high.
[0099]
The adder 36 inputs the output signal IV19 from the function setting unit 35 and the IV opening deviation value IV7 from the amplifier 21, and outputs an addition signal IV20.
[0100]
The negative signal detector 37 receives the addition signal IV20 and outputs a signal IV21 that is turned on when the signal becomes negative.
[0101]
The AND operator 28E operates the quick closing operation device 29 using the ON signal obtained by inputting the two ON signals of the output signal TP2 and the signal IV21 as the quick closing electric signal IV12.
[0102]
With the above configuration, either the opening setting value P1 or the generator load value G1 from the opening setting device 14 is input to the dead time setting device 34. This dead time setter 34 is the same as that in the third embodiment described above, and a signal IV22 obtained by delaying the input signal by a predetermined time is output. The signal IV22 is input to the function setter 35, and a signal IV19 having substantially the same characteristics as shown in the fourth embodiment is output.
[0103]
The signal IV19 and the IV opening deviation value IV7 are input to the adder 36, and an addition signal IV20 obtained by adding both is output. The addition signal IV20 is input to the negative polarity signal detector 37, and a signal IV21 that is turned on when the signal becomes negative polarity is output.
[0104]
Then, two signals of the output signal IV21 and the output signal TP2 of the sudden closing value detector 27 are input to the logical product calculator 28E, and the sudden closing operation device 29 is operated by the obtained sudden closing electric signal IV12. .
[0105]
Thus, the fifth embodiment is different from the fourth embodiment in that the value of the signal IV19 is changed according to the opening set value P1 or the generator load value G1, and the opening set value P1 or The generator load value G1 is input to the dead time setter 34, and after a predetermined dead time has elapsed, the signal IV22 is output. This dead time is set as the time until the generator load is lost, the turbine is accelerated, the IV opening command is sufficiently closed, and a region where a closing deviation occurs is reached. Even when a generator load signal is input, the time is set based on the above-described concept.
[0106]
As in the fourth embodiment, this is set to zero in order to detect the generator load lost state and set the opening setting value P1 to zero when the generator load loss occurs when the turbine is in a high output state. This is because the signal IV19 needs to be calculated with the immediately preceding value, and after the opening setting value P1 is made zero, the setting is the same as in the turbine low output state.
[0107]
Thus, in the normal turbine acceleration in the turbine low output state, the IV rapid closing does not operate, and the stable turbine output operation can be continued. Further, the IV rapid closing operation point can be advanced in the turbine acceleration in the turbine high output state.
[0108]
Next, a sixth embodiment of the present invention will be described with reference to FIG.
[0109]
In FIG. 8, the same reference numerals as those in FIG. 1 showing the first embodiment denote the same or corresponding parts, and the sixth embodiment differs from the configuration of the valve quick closing signal output unit 52A in that the valve quick closing signal output unit 52F. A closing deviation detector 26 similar to that of the first embodiment is provided, and a logical product calculator 28F, an adder 38, and a deviation detector 39 are further provided.
[0110]
The adder 38 adds the steam pressure value TP1 and the generator load value G1 and outputs a deviation signal TP3.
[0111]
The deviation detector 39 receives the deviation signal TP3 and outputs a signal TP4 that is ON when it is positive and is equal to or greater than a predetermined value.
[0112]
With the above configuration, the steam pressure value TP1 and the generator load value G1 are input to the adder 38, and a deviation signal TP3 obtained by subtracting the generator load value G1 from the steam pressure value TP1 is output. The deviation signal TP3 is input to the deviation detector 39, and a signal TP4 that is ON when the signal is positive and exceeds a predetermined value is output.
[0113]
Then, the two signals of the signal TP4 and the large deviation deviation signal IV11 of the closing deviation detector 26 are input to the logical product operator 28F, and the sudden closing operator 29 is operated by the obtained sudden closing electric signal IV12. The
[0114]
As a result, the turbine output is changed by adjusting the CV opening with respect to fluctuations in turbine speed due to power system fluctuations. Further, the opening degree of IV6 may be controlled only when the turbine is abnormally accelerated, such as when the generator load is lost. In normal operation, the operation is synchronized with the power system, so that IV6 may be kept fully open. In this embodiment, an unbalanced state between the generator load value and the turbine output is detected, and this condition is added to the operating condition of the quick closing operation device 29.
[0115]
The predetermined deviation value that is detected by the deviation detector 39 is set based on the same concept as the setting value that is set in the sudden closing value detector 27.
[0116]
Therefore, the IV rapid closing operation is not performed only by changing the turbine speed, and the IV rapid closing operation is performed only when the turbine output and the generator load are unbalanced and the turbine is accelerated. There is no sudden closing operation, and stable turbine operation can be continued.
[0117]
Next, a seventh embodiment of the present invention will be described with reference to FIG.
[0118]
In FIG. 9, the same reference numerals as those in FIG. 1 showing the first embodiment denote the same or corresponding parts, and the seventh embodiment is a valve emergency different in configuration from the valve quick closing signal output unit 52A of the first embodiment. The closing signal output unit 52G is provided with a closing deviation detector 26 similar to that of the first embodiment, and further, an AND operation unit 28G, an adder 38, a deviation detector 39, and a sudden decrease detector 40 are provided.
[0119]
The adder 38 adds the steam pressure value TP1 and the generator load value G1 and outputs a deviation signal TP3.
[0120]
The deviation detector 39 receives the deviation signal TP3 and outputs a signal TP4 that is ON when it is positive and is equal to or greater than a predetermined value.
[0121]
The sudden decrease detector 40 outputs a signal G2 that is turned ON when the generator load value G1 decreases at a speed greater than a predetermined rate of change.
[0122]
With the above configuration, the steam pressure value TP1 and the generator load value G1 are input to the adder 38, and the deviation signal TP3 obtained by subtracting the generator load value G1 from the steam pressure value TP1 is output. The deviation signal TP3 is input to the deviation detector 39, and a signal TP4 that is ON when the signal is positive and exceeds a predetermined value is output.
[0123]
Further, the generator load value G1 is input to the sudden decrease detector 40, and a signal G2 that is turned on when the input signal decreases at a speed greater than a predetermined rate of change is output.
[0124]
Then, the above three signals of the output signal TP4, the signal G2, and the large deviation signal IV11 of the closing deviation detector 26 are input to the logical product calculator 28G, and the abrupt closing operation is performed by the obtained sudden closing electric signal IV12. The device 29 is operated.
[0125]
As a result, the fact that the generator load signal has sharply decreased with respect to the aforementioned sixth embodiment is added to the conditions for the IV rapid closing operation. In this case, the rapid decrease detection is not generated in the normal operation state, but is set so as to detect the change rate equivalent that occurs when the generator load is instantaneously disconnected.
[0126]
In this embodiment, since it is added that the state of the generator load is abnormal, it is possible to reliably prevent the IV rapid closing operation due to the deviation detection operation when the generator load is shaken in the turbine low output state. .
[0127]
Therefore, only when the turbine speed fluctuates, the IV rapid closing operation is not performed, and the IV rapid closing operation is performed only when the turbine output and the generator load are unbalanced and the turbine is accelerated. There is no IV rapid closing operation, and stable turbine operation can be continued. In addition, since the condition that the state of the generator load is abnormal is added, it is possible to reliably prevent the IV abrupt closing operation when the generator load is shaken in the turbine low output state.
[0128]
Next, an eighth embodiment of the present invention will be described with reference to FIG.
[0129]
10, the same reference numerals as those in FIG. 1 showing the first embodiment denote the same or corresponding parts, the eighth embodiment has a different configuration of the feedback control unit 51, and the feedback control unit 51A is the first embodiment. The same adder 20, amplifier 21, positive polarity signal limiter 22, and electric / hydraulic converter 23 are provided, and a function setting unit 41 is further provided.
[0130]
The function setter 41 is set such that when the generator load value G1 is low, the set value IV23 is low, and when the load G1 is high, the set value IV23 is high.
[0131]
With the above configuration, the generator load value G1 is input to the function setting device 41, and the IV opening speed setting deviation value IV23 corresponding to the load value is output. The function setting unit 41 has characteristics as shown in FIG. 11, for example, and outputs a small value in a low load region and a large value in a high load region.
[0132]
Next, the IV opening speed setting deviation value IV23 and the IV opening degree deviation value IV7 are input to the positive polarity signal limiter 22 so that the IV opening degree deviation value IV7 does not become larger than the IV opening speed setting deviation value IV23. The signal IV8 is output with limitation, and is input to the electric / hydraulic converter 23.
[0133]
As a result, in the conventional example, the setting of IV6 opening direction change rate restriction is a fixed value, but in this embodiment, the setting is changed according to the generator load value G1. In the turbine speed control by IV6 after the loss of the generator load, the change rate in the IV closing direction is required to be high speed, but the change rate in the IV open direction does not require high speed. Therefore, the setting of the function setting device 41 outputs a signal that decreases the rate of change when the generator load value is small and increases the rate of change when the load value is large.
[0134]
Therefore, when the generator load is small, the rate of change in the IV opening direction is moderate, and steam is gradually introduced into the low-pressure turbine, eliminating unnecessary turbine acceleration and IV abrupt closing operations. Loss of generator load Later IV speed control becomes stable, and settling to the rated speed becomes faster.
[0135]
Next, a ninth embodiment of the present invention will be described with reference to FIG.
[0136]
12, the same reference numerals as those in FIG. 1 showing the first embodiment denote the same or corresponding parts, the ninth embodiment has a different configuration of the feedback control unit 51, and the feedback control unit 51B is different from the first embodiment. A similar adder 20, amplifier 21, positive polarity signal limiter 22, electric / hydraulic converter 23, and valve opening detector 25 are further provided with a function setter 42 and an opening direction change rate limiter 43. Yes.
[0137]
When the generator load value G1 is low, the function setter 42 outputs a high value for the IV open speed change rate setting IV25 when the generator open value G1 is low and when the generator load value G1 is high.
[0138]
The opening direction change rate limiter 43 limits the change in the opening direction of the signal IV24 by the IV opening speed change rate setting IV25 from the function setting unit 42.
[0139]
With the above configuration, the generator load value G1 is input to the function setting unit 42, and the IV opening speed change rate setting IV25 corresponding to the load value is output. The function setting unit 42 has the same characteristics as those in FIG. 11 described above, and outputs a small value in a low load region and a large value in a high load region.
[0140]
On the other hand, the IV speed control signal IV1, the output signal IV2 of the CV / IV coefficient unit 17, and the output signal IV3 of the full open value setter 18 are added by the adder 19, and the above-described IV open speed change. The rate setting IV25 is input to the opening direction change rate limiter 43, and the rate of change of the signal IV24 is limited so as not to be larger than the rate of change of the IV opening speed change rate setting IV25, and the IV opening command value IV4 is output. Is done.
[0141]
As a result, similarly to the above-described eighth embodiment, the limit of the opening direction change rate is variably set, and in this embodiment, the change rate of the IV opening command value IV4 is limited. The function setting method for inputting the generator load value G1 to the function setting unit 42 and outputting the IV opening speed change rate setting IV25 is the same as in the eighth embodiment.
[0142]
Therefore, when the generator load is small, the rate of change in the opening direction of IV6 is gentle and the steam gradually flows into the low-pressure turbine, eliminating unnecessary turbine acceleration and repeated IV rapid closing operations. IV speed control after loss of machine load becomes stable, and settling to the rated speed becomes faster.
[0143]
In addition, this invention can be implemented as follows.
[0144]
1) Although the present invention has been described with reference to a turbine system of a thermal power plant, it can be similarly implemented if it is a steam turbine including a nuclear power plant.
[0145]
2) In the present invention, the high pressure turbine outlet (exhaust) pressure is used as a signal proportional to the turbine output, but any steam pressure at the reheater inlet, the reheater outlet, or the low pressure turbine inlet is used. But there are similar effects.
[0146]
3) The embodiment shown in the present invention represents a partial improvement of a conventional turbine control system. Therefore, the effect according to the objective can be acquired by implementing combining 1st Example-9th Example in multiple numbers.
[0147]
【The invention's effect】
As described above, the first invention Group (invention of claims 1-7) According to the present invention, the generator is tripped due to the reverse current protection operation at the low output because the sudden closing operation of the intermediate steam valve is prevented in the turbine low output state and in the normal turbine acceleration state. You can avoid that. Further, for large turbine acceleration that occurs when the generator load is lost, the intermediate steam valve can be suddenly closed to suppress the turbine acceleration value to a specified value or less.
[0148]
The second invention Group (Inventions of Claims 8 and 9) Since the rate of change in the open direction of the signal based on the deviation between the opening command value and the actual opening value is limited according to the generator load value, a rapid restart operation may be performed after the generator load is lost. Unnecessary turbine acceleration does not occur. Therefore, the repetition of the sudden closing operation of the intermediate steam valve is suppressed, and the turbine speed can be quickly set to the rated value.
[Brief description of the drawings]
FIG. 1 shows the present invention. The first It is a block diagram of the control apparatus of the intermediate steam valve which shows one Example.
FIG. 2 shows the present invention. The first It is a block diagram of the valve rapid closing signal output part with which the control apparatus of the intermediate steam valve which shows 2 Example is equipped.
FIG. 3 is an explanatory diagram showing an example of a function setting device in FIG. 2;
FIG. 4 shows the present invention. The first It is a block diagram of the valve rapid closing signal output part with which the control apparatus of the intermediate steam valve which shows 3 Example is provided.
FIG. 5 shows the present invention. The first It is a block diagram of the valve rapid closing signal output part with which the control apparatus of the intermediate steam valve which shows 4 Example is provided.
6 is an explanatory diagram showing an example of a function setting device in FIG. 5. FIG.
FIG. 7 shows the present invention. The first It is a block diagram of the valve rapid closing signal output part with which the control apparatus of the intermediate steam valve which shows 5 Example is provided.
FIG. 8 shows the present invention. The first It is a block diagram of the valve rapid closing signal output part with which the control apparatus of the intermediate steam valve which shows 6 Example is provided.
FIG. 9 shows the present invention. The first It is a block diagram of the valve rapid closing signal output part with which the control apparatus of the intermediate steam valve which shows 7 Example is provided.
FIG. 10 shows the present invention. The first It is a block diagram of the feedback control part with which the control apparatus of the intermediate steam valve which shows 8 Example is provided.
11 is an explanatory diagram illustrating an example of a function setting device in FIG. 10;
FIG. 12 shows the present invention. The first It is a block diagram of the feedback control part with which the control apparatus of the intermediate | middle steam valve which shows 9 Example is equipped.
FIG. 13 is a system diagram of a steam turbine in a thermal power plant.
FIG. 14 is a configuration diagram of an intermediate steam valve control device showing a conventional example.
FIG. 15 is a first operation explanatory view showing the operation of the steam control valve and the intermediate steam valve.
FIG. 16 is a second operation explanatory view showing the operation of the steam control valve and the intermediate steam valve.
FIG. 17 is a first operation explanatory diagram of a valve rapid closing signal output unit provided in a conventional intermediate steam valve control device;
FIG. 18 is a second operation explanatory diagram of a valve rapid closing signal output unit provided in a conventional intermediate steam valve control device;
FIG. 19 is a third operation explanatory diagram of a valve rapid closing signal output unit provided in a conventional intermediate steam valve control device;
FIG. 20 is a fourth operation explanatory diagram of a valve rapid closing signal output unit provided in a conventional intermediate steam valve control device;
[Explanation of symbols]
11 Reference speed setter
14 Opening setting device
16 Intermediate steam valve coefficient unit
18 Fully open value setter
20 Adder
21 Amplifier
22 Positive signal limiter
23 Electric / Hydraulic Converter
24 Valve actuator
25 Valve opening detector
26 Closed deviation detector
27 Sudden value detector
28A to 28G AND operator
29 Quick closing actuator
30 Intermediate steam valve command value detector
31 Function setter
32 Adder
33 Positive signal detector
34 Dead time setting device
35, 41, 42 Function setter
36 Adder
37 Negative signal detector
38 Adder
39 Deviation detector
40 Rapid decrease detector
43 Opening direction change rate limiter
50 Opening command calculator
51A, 51B Feedback control unit
52A to 52G Valve quick closing signal output section

Claims (9)

An opening command calculation unit that calculates an opening command value of the intermediate steam valve based on a deviation speed signal obtained from the turbine speed signal and the reference speed setting signal, and the opening command calculated by the opening command calculation unit A feedback control unit that controls the opening and closing of the intermediate steam valve via a valve actuator so that the actual opening value of the intermediate steam valve follows the value, and a quick closing electrical signal in an emergency separately from the control system of the feedback control unit In the control device for the intermediate steam valve, having a valve quick closing signal output unit for outputting the output to the quick closing operation device and causing the intermediate steam valve to close rapidly through the valve operation device,
The valve rapid closing signal output unit includes a closing deviation detector that outputs a first signal when a signal based on a deviation between the opening command value and the actual opening value is a predetermined value or more, and an inlet of the intermediate steam valve An abrupt closing value detector that outputs a second signal when the turbine exhaust pressure on the side is equal to or greater than a predetermined value; an intermediate steam valve command value detector that outputs a third signal when the opening command value is equal to or greater than a predetermined value; said first signal and said second signal and said third signal with logical condition satisfied by the rapid閉電said electrical signal and outputs to the rapid closing operation unit calculator and between the steam valve in you comprising: a of Control device. An opening command calculation unit that calculates an opening command value of the intermediate steam valve based on a deviation speed signal obtained from the turbine speed signal and the reference speed setting signal, and the opening command calculated by the opening command calculation unit A feedback control unit that controls the opening and closing of the intermediate steam valve via a valve actuator so that the actual opening value of the intermediate steam valve follows the value, and a quick closing electrical signal in an emergency separately from the control system of the feedback control unit In the control device for the intermediate steam valve, having a valve quick closing signal output unit for outputting the output to the quick closing operation device and causing the intermediate steam valve to close rapidly through the valve operation device,
The valve rapid closing signal output unit includes a closing deviation detector that outputs a first signal when a signal based on a deviation between the opening command value and the actual opening value is a predetermined value or more, and an inlet of the intermediate steam valve A sudden closing value detector for outputting a second signal when the turbine exhaust pressure on the side is equal to or greater than a predetermined value, a function setting unit for outputting a signal corresponding to the turbine exhaust pressure by a preset function, and the function setting unit An adder for subtracting the opening command signal from the signal from, a positive signal detector that outputs the third signal when the addition signal from the adder is positive and has a predetermined value; said first signal and said second signal and said third signal with logical condition satisfied by the rapid閉電said electrical signal and outputs to the rapid closing operation unit calculator and between the steam valve in you comprising: a of Control device. An opening command calculation unit that calculates an opening command value of the intermediate steam valve based on a deviation speed signal obtained from the turbine speed signal and the reference speed setting signal, and the opening command calculated by the opening command calculation unit A feedback control unit that controls the opening and closing of the intermediate steam valve via a valve actuator so that the actual opening value of the intermediate steam valve follows the value, and a quick closing electrical signal in an emergency separately from the control system of the feedback control unit In the control device for the intermediate steam valve, having a valve quick closing signal output unit for outputting the output to the quick closing operation device and causing the intermediate steam valve to close rapidly through the valve operation device,
The valve rapid closing signal output unit includes a closing deviation detector that outputs a first signal when a signal based on a deviation between the opening command value and the actual opening value is a predetermined value or more, and an inlet of the intermediate steam valve It is obtained by applying a predetermined dead time by inputting a rapid closing value detector that outputs a second signal when the turbine exhaust pressure on the side is equal to or higher than a predetermined value, and an opening setting value or a generator load value of the steam control valve A dead time setter for outputting a signal, a function setter for outputting a signal corresponding to the signal from the dead time setter by a preset function, and the opening command value from the signal from the function setter. An adder to be subtracted; a positive signal detector that outputs a third signal when the addition signal from the adder has a positive value; and the first signal, the second signal, and the first signal When the logic condition with 3 signals is met, Controller between the steam valve in you; and a calculator for outputting the rapid closing operation device. An opening command calculation unit that calculates an opening command value of the intermediate steam valve based on a deviation speed signal obtained from the turbine speed signal and the reference speed setting signal, and the opening command calculated by the opening command calculation unit A feedback control unit that controls the opening and closing of the intermediate steam valve via a valve actuator so that the actual opening value of the intermediate steam valve follows the value, and a quick closing electrical signal in an emergency separately from the control system of the feedback control unit In the control device for the intermediate steam valve, having a valve quick closing signal output unit for outputting the output to the quick closing operation device and causing the intermediate steam valve to close rapidly through the valve operation device,
The valve abrupt closing signal output unit outputs a sudden closing value detector that outputs as a first signal when the turbine exhaust pressure on the inlet side of the intermediate steam valve is equal to or greater than a predetermined value, and sets the turbine exhaust pressure by a preset function. A function setter that outputs a corresponding signal, an adder that adds a signal output from the function setter, a signal based on a deviation between the opening command value and the actual opening value, and an output from the adder A negative signal detector that outputs a second signal when the addition signal is negative and greater than or equal to a predetermined value, and the suddenly closed electrical signal is changed to abrupt when a logical condition is established between the first signal and the second signal. controller between the steam valve in you; and a calculator for outputting the closing operation device. An opening command calculation unit that calculates an opening command value of the intermediate steam valve based on a deviation speed signal obtained from the turbine speed signal and the reference speed setting signal, and the opening command calculated by the opening command calculation unit A feedback control unit that controls the opening and closing of the intermediate steam valve via a valve actuator so that the actual opening value of the intermediate steam valve follows the value, and a quick closing electrical signal in an emergency separately from the control system of the feedback control unit In the control device for the intermediate steam valve, having a valve quick closing signal output unit for outputting the output to the quick closing operation device and causing the intermediate steam valve to close rapidly through the valve operation device,
The valve abrupt closing signal output unit includes a sudden closing value detector that outputs a first signal when the turbine exhaust pressure on the inlet side of the intermediate steam valve is greater than or equal to a predetermined value, and a steam control valve opening set value or a generator A dead time setting device that inputs a load value and performs processing of a predetermined dead time, a function setting device that outputs a signal according to a function set in advance according to a signal output from the dead time setting device, and the function setting An adder that adds a signal based on a deviation between the signal output from the opening device, the opening command value, and the actual opening value, and the addition signal from the adder is negative and greater than a predetermined value. A negative-polarity signal detector that outputs two signals; and an arithmetic unit that outputs the sudden-close electrical signal to the sudden-close operation device when a logical condition between the first signal and the second signal is satisfied. controller between the steam valve in you with. An opening command calculation unit that calculates an opening command value of the intermediate steam valve based on a deviation speed signal obtained from the turbine speed signal and the reference speed setting signal, and the opening command calculated by the opening command calculation unit A feedback control unit that controls the opening and closing of the intermediate steam valve via a valve actuator so that the actual opening value of the intermediate steam valve follows the value, and a quick closing electrical signal in an emergency separately from the control system of the feedback control unit In the control device for the intermediate steam valve, having a valve quick closing signal output unit for outputting the output to the quick closing operation device and causing the intermediate steam valve to close rapidly through the valve operation device,
The valve rapid closing signal output unit includes a closing deviation detector that outputs a first signal when a signal based on a deviation between the opening command value and the actual opening value is equal to or greater than a predetermined value, and a generator from a turbine exhaust pressure. An adder that subtracts the load value, a deviation detector that outputs a second signal when the addition signal from the adder is positive and equal to or greater than a predetermined value, and the logic of the first signal and the second signal controller between the steam valve in you; and a computing unit by establishment of the condition for outputting the rapid closing signal to the abrupt closing operation device. An opening command calculation unit that calculates an opening command value of the intermediate steam valve based on a deviation speed signal obtained from the turbine speed signal and the reference speed setting signal, and the opening command calculated by the opening command calculation unit A feedback control unit that controls the opening and closing of the intermediate steam valve via a valve actuator so that the actual opening value of the intermediate steam valve follows the value, and a quick closing electrical signal in an emergency separately from the control system of the feedback control unit In the control device for the intermediate steam valve, having a valve quick closing signal output unit for outputting the output to the quick closing operation device and causing the intermediate steam valve to close rapidly through the valve operation device,
The valve rapid closing signal output unit includes a closing deviation detector that outputs a first signal when a signal based on a deviation between the opening command value and the actual opening value is a predetermined value or more, and a generator from a turbine exhaust pressure. An adder that subtracts the load value, a deviation detector that outputs a second signal when the addition signal from the adder is positive and greater than or equal to a predetermined value, and a reduction rate of the generator load value that is greater than or equal to a predetermined value A sudden decrease detector that outputs a third signal, and an arithmetic unit that outputs the sudden closing signal to the sudden closing operator when a logical condition of the first signal, the second signal, and the third signal is satisfied. controller between the steam valve in you, characterized in that. An opening command calculation unit that calculates an opening command value of the intermediate steam valve based on a deviation speed signal obtained from the turbine speed signal and the reference speed setting signal, and the opening command calculated by the opening command calculation unit A feedback control unit for controlling the opening and closing of the intermediate steam valve via a valve actuator so that the actual opening value of the intermediate steam valve follows the value, and a quick closing electrical signal in an emergency separately from the control system of the feedback control unit In the control device for the intermediate steam valve, having a valve quick closing signal output unit for outputting the output to the quick closing operation device and causing the intermediate steam valve to close rapidly through the valve operation device,
The feedback control unit receives a generator load value and outputs a predetermined signal corresponding to the generator load value by a preset function; the opening command value and the actual opening value; control device for a steam valve between inside you, wherein the opening direction change rate signal based on the deviation comprise a positive polarity signal limiter for limiting by the signal which the function setting unit is output. An opening command calculation unit that calculates an opening command value of the intermediate steam valve based on a deviation speed signal obtained from the turbine speed signal and the reference speed setting signal, and the opening command calculated by the opening command calculation unit A feedback control unit that controls the opening and closing of the intermediate steam valve via a valve actuator so that the actual opening value of the intermediate steam valve follows the value, and a quick closing electrical signal in an emergency separately from the control system of the feedback control unit In the control device for the intermediate steam valve, having a valve quick closing signal output unit for outputting the output to the quick closing operation device and causing the intermediate steam valve to close rapidly through the valve operation device,
The feedback control unit is configured to input a generator load value and output a signal corresponding to the generator load value according to a preset function, and to set the opening direction change rate of the opening command value as the function setting. vessel control apparatus between the steam valve in you, comprising the the opening direction change rate limiter to limit the feedback control by the signal to be output.

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