CN110320939A - A kind of nuclear power station GSS system drain tank tank level control system and method - Google Patents
A kind of nuclear power station GSS system drain tank tank level control system and method Download PDFInfo
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- CN110320939A CN110320939A CN201910673783.2A CN201910673783A CN110320939A CN 110320939 A CN110320939 A CN 110320939A CN 201910673783 A CN201910673783 A CN 201910673783A CN 110320939 A CN110320939 A CN 110320939A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
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Abstract
The present invention provides a kind of nuclear power station GSS system drain tank tank level control system and methods, belong to nuclear power station automatic control technology field；System includes flow feedforward control module, for real-time detection unit duty parameter, it according to the characteristic curve of the unit duty parameter and drain valve, determines that the first of drain valve for maintaining drain tank water loading amount stable determines aperture, and controls the drain valve in time and adjust to described and just determine aperture；Liquid level closed loop control module, for calculating the aperture correction amount of the drain valve according to the deviation between the actual liquid level value for just determining the drain tank under aperture and setting level value, and the aperture of the drain valve is corrected according to the aperture correction amount, so that the level stability of the drain tank.Flow feedforward control module and Liquid level closed loop module collective effect, so that the control of nuclear power station GSS system drain tank is more accurate, anti-interference is stronger.
Description
Technical field
The present invention relates to nuclear power station automatic control technology field, in particular to a kind of nuclear power station GSS system drain tank liquid level
Control system and method.
Background technique
The Steam Power Circulation of nuclear power plant is using Rankine cycle as theoretical basis.For improve power plant heat-economy, simultaneously
Extend the turbine rotor service life, nuclear power plant generally passes through the degree of superheat that GSS system improves high pressure cylinder steam discharge.Nuclear power station GSS system
Structure for double reheating device, double reheating device is identical, and only reheating vapour source is different；Wherein, the vapour source of level-one reheater is from height
The vapour source of cylinder pressure level-one steam extraction, second level reheater comes from main steam.
Referring to Fig. 1, the heating vapour source of the level-one reheater of existing nuclear power station GSS system comes from the steam extraction of high pressure cylinder level-one,
It is hydrophobic that saturation is formed after shell-and-tube heat exchanger shell-side heat release, and is saturated and hydrophobic can be collected into drain tank.And it is heated
High pressure cylinder steam discharge then passes through Tube Sheet of Heat Exchanger side, enter after heat absorption heating second level reheater tube side through the heating of shell-side main steam to
Further increase temperature again.It collects to be saturated hydrophobic drain tank and design and has two sets of draining systems: one, under nominal situation, utilizing GSS
Existing pressure difference between system and AHP makes the hydrophobic of GSS system flow to 6 grades of high-pressure heaters of AHP by normal drain valve
Shell-side, to further increase AHP system feed temperature, to improve the thermal efficiency；Two, it meets an urgent need under operating condition, the hydrophobic of GSS system is led to
It crosses lash-up drain valve and flows to CEX condenser.
In order to guarantee that the safe and economic operation of nuclear power station, the liquid level of drain tank must be strictly controlled in a certain range.So
And the draining system control strategy under existing nominal situation is only capable of coping with some small disturbances, when transient condition occurs in unit
When, cause the through-current capability of drain valve also to have occurred very since extraction pressure, flow, drain valve pre-post difference extrude existing large change
Big variation just will appear the case where drain valve responds liquid level not in time, make hydrophobic liquid level beyond normal regulating range, cause
GSS steam extraction isolation or even the protection of chain triggering Steam Turbine are shut down.
Summary of the invention
The present invention is only capable of coping with for the draining system control strategy under the nominal situation in the presence of the prior art
Small disturbance, and when transient condition occurs in unit, it just will appear the case where drain valve responds liquid level not in time, lead to hydrophobic liquid
It the problem of position exceeds normal regulating range, and GSS steam extraction isolation or even the protection of chain triggering Steam Turbine is caused to be shut down, provides
A kind of nuclear power station GSS system drain tank tank level control system and method.
The technical solution that the present invention is proposed with regard to above-mentioned technical problem is as follows:
One aspect of the present invention provides a kind of nuclear power station GSS system drain tank tank level control system, comprising:
Flow feedforward control module is used for real-time detection unit duty parameter, and according to the unit duty parameter and dredges
The characteristic curve of water valve determines that the first of drain valve for maintaining drain tank water loading amount stable determines aperture, and controls in time described hydrophobic
Valve, which is adjusted to described, just determines aperture；
Liquid level closed loop control module, for according to the actual liquid level value for just determining the drain tank under aperture and setting liquid
Deviation between place value calculates the aperture correction amount of the drain valve, and corrects the drain valve according to the aperture correction amount
Aperture, so that the level stability of the drain tank.
Further, the flow feedforward control module includes:
First data detecting unit, for unit duty parameter described in real-time detection；The unit duty parameter includes working as
The pressure of preceding steam flow, drain temperature and drain tank；
First computing unit is connect with first data detecting unit, for real according to the unit duty parameter
When calculate the maximum through-current capacity of current drain valve, and further calculate the maximum through-current capacity of current steam flow Yu current drain valve
Ratio；
Just determine aperture determination unit, connect with first computing unit, based on according to first computing unit
The characteristic curve for the ratio inquiry drain valve calculated, determines the first of the drain valve for maintaining the drain tank water loading amount stable
Determine aperture；
Filter unit is just determined aperture determination unit and is connect with described, for being filtered to determining aperture at the beginning of described,
To improve the stability of control；And
First valve regulated unit, connect with the filter unit, for control the drain valve be rapidly reached it is described
Just determine aperture.
Further, the maximum through-current capacity Q of the current drain valvemCalculation formula it is as follows:
Cv=1.16KvFormula 1.1
Wherein, CvFor discharge coefficient；CfFor critical flow coefficient；GfFor hydrophobic density；ΔPsTo adjust valve pressure drop.
Further, the adjusting valve pressure drop Δ PsCalculation formula it is as follows:
Wherein, P1For valve upstream pressure；PsFor hydrophobic saturation pressure；PcFor medium critical pressure；
In conjunction with the formula 1.1, the formula 1.2 and the formula 1.3, the maximum through-current capacity Q of the current drain valvemCalculating
Formula is further as follows:
Further, the flow feedforward control module further includes the first data processing unit, is examined with first data
It surveys unit to connect with first computing unit, the validity for unit duty parameter described in real-time judge；In current unit
When the judging result of duty parameter is effective, the current unit duty parameter is sent to first computing unit；Working as
When the judging result of preceding unit duty parameter is invalid, by the previous effective unit nearest away from the current unit duty parameter
Duty parameter is sent to first computing unit.
Further, the liquid level closed loop control module includes:
Second data detecting unit, for the setting level value of drain tank described in real-time detection, actual liquid level value and described
The actual valve position of drain valve；
Second computing unit is connect with second data detecting unit, for the practical liquid according to the drain tank
Deviation between place value and the setting level value of the drain tank calculates the aperture correction amount of the drain valve；And
Second valve regulated unit is connect with second computing unit, for being corrected according to the aperture correction amount
The aperture of the drain valve, so that the level stability of the drain tank.
Further, the liquid level closed loop control module further includes aperture correction amount limiting unit, is calculated with described second
Unit is connected with the second valve regulated unit, and the aperture correction amount for judging that the computing unit is calculated is
It is no to be located in preset range；When the aperture correction amount is located in preset range, the aperture correction amount is sent to described
Second valve regulated unit；When the aperture correction amount exceeds the preset range, the preset range is opened close to described
One end value of degree correction amount is sent to the second valve regulated unit.
Further, the liquid level closed loop control module further includes the second data processing unit, is examined with second data
It surveys unit to connect with second computing unit, the validity for actual liquid level value described in real-time judge；In currently practical liquid
When the judging result of place value is effective, the currently practical level value is sent to second computing unit；Currently practical
When the judging result of level value is invalid, the previous effective actual liquid level value nearest away from the currently practical level value is sent
To second computing unit.
Another aspect of the present invention provides a kind of nuclear power station GSS system drain tank liquid level controlling method, including following
Step:
Real-time detection unit duty parameter, and according to the characteristic curve of the unit duty parameter and drain valve, determining dimension
It holds the first of the stable drain valve of drain tank water loading amount and determines aperture, and control the drain valve in time and adjust to described and just determine aperture；
Institute is calculated according to the deviation between the actual liquid level value for just determining the drain tank under aperture and setting level value
The aperture correction amount of drain valve is stated, and corrects the aperture of the drain valve according to the aperture correction amount, so that the drain tank
Level stability.
Further, the real-time detection unit duty parameter, and according to the characteristic of the unit duty parameter and drain valve
Curve determines that the first of drain valve for maintaining drain tank water loading amount stable determines aperture, and controls the drain valve in time and adjust to institute
State the specific implementation for just determining aperture are as follows:
Step 11: unit duty parameter described in real-time detection；The unit duty parameter includes current steam flow, hydrophobic
The pressure of temperature and drain tank；
Step 12: calculating the maximum through-current capacity of current drain valve in real time according to the unit duty parameter, and further count
Calculate the ratio of the maximum through-current capacity of current steam flow and current drain valve；
Step 13: inquiring the characteristic curve of drain valve according to the ratio, determine and the drain tank water loading amount is maintained to stablize
The first of the drain valve determine aperture；
Step 14: to be calculated it is first determine aperture and be filtered, to improve the stability of control；
Step 15: controlling the drain valve and be rapidly reached and described just determine aperture.
Further, in the step 12, the maximum through-current capacity Q of the current drain valvemCalculation formula it is as follows:
Cv=1.16KvFormula 1.1
Wherein, CvFor discharge coefficient；CfFor critical flow coefficient；GfFor hydrophobic density；ΔPsTo adjust valve pressure drop.
Further, the adjusting valve pressure drop Δ PsCalculation formula it is as follows:
Wherein, P1For valve upstream pressure；PsFor hydrophobic saturation pressure；PcFor medium critical pressure；
In conjunction with the formula 1.1, the formula 1.2 and the formula 1.3, the maximum through-current capacity Q of the current drain valvemCalculating
Formula is further as follows:
Further, in the maximum for calculating the current drain valve in real time according to the unit duty parameter in the step 12
Before through-current capacity, the validity of unit duty parameter described in real-time judge is also needed；In the judging result of current unit duty parameter
When being effective, retain the current unit duty parameter；It, will be described when the judging result of current unit duty parameter is invalid
Current unit duty parameter replaces with the previous effective unit duty parameter nearest away from the current unit duty parameter.
Further, described according between the actual liquid level value for just determining the drain tank under aperture and setting level value
Deviation calculates the aperture correction amount of the drain valve, and corrects the specific of the aperture of the drain valve according to the aperture correction amount
It realizes are as follows:
Step 21: the actual valve for setting level value, actual liquid level value and the drain valve of drain tank described in real-time detection
Position；
Step 22: according to the drift gage between the actual liquid level value of the drain tank and the setting level value of the drain tank
Calculate the aperture correction amount of the drain valve；
Step 23: the aperture of the drain valve is corrected according to the aperture correction amount, so that the liquid level of the drain tank is steady
It is fixed.
Further, it is also needed before correcting the aperture of the drain valve according to the aperture correction amount in the step 23
Judge whether the aperture correction amount is located in preset range；When the aperture correction amount is located in preset range, retain institute
State aperture correction amount；When the aperture correction amount exceeds the preset range, the aperture correction value is replaced with described pre-
If range is close to an end value of the aperture correction amount.
Further, according to the actual liquid level value of the drain tank and the setting liquid level of the drain tank in the step 22
Before deviation between value calculates the aperture correction amount of the drain valve, the effective of actual liquid level value described in real-time judge is also needed
Property；When the judging result of currently practical level value is effective, retain the currently practical level value；In currently practical level value
Judging result when being invalid, the currently practical level value is replaced with to be had away from nearest previous of the currently practical level value
The actual liquid level value of effect.
Technical solution provided in an embodiment of the present invention has the benefit that
Drain tank liquid level is controlled by flow feedforward control module and liquid level closed loop control module collective effect；Wherein,
Flow feedforward control module is opened loop control, and by the changes in process parameters of real time monitoring drain tank, quantitative calculate determines dimension
It holds stable the first of drain valve of drain tank water loading amount and determines aperture, adjust for controlling drain valve in time to aperture is just determined, guarantee to dredge
The stabilization of the water loading amount of water tank guarantees that big variation does not occur for drain tank liquid level, accelerates the response speed of draining system；Liquid level is closed
Ring control module can guarantee that the accurate control of drain tank liquid level, export-restriction also can effectively avoid under transient condition because hydrophobic
Valve caused by " flash distillation " liquid level acute variation exceeds the problem of normal regulating band.The effect of Liquid level closed loop module is to utilize
Level imbalance realizes that just determining aperture to the valve that flow feedforward control module determines is modified, and guarantees that nuclear power station GSS system is dredged
The Liquid level of water tank is accurate；Flow feedforward control module and Liquid level closed loop module collective effect, so that nuclear power station GSS system
The control of system drain tank is more accurate, anti-interference is stronger.
Detailed description of the invention
Fig. 1 is the hydrophobic liquid level control flow schematic diagram of the level-one reheater draining system of nuclear power station GSS system；
Fig. 2 is that the embodiment of the present invention provides the module map of nuclear power station GSS system drain tank tank level control system；
Fig. 3 is that the embodiment of the present invention provides flow feedforward control mould in nuclear power station GSS system drain tank tank level control system
The schematic diagram of block；
Fig. 4 is that the embodiment of the present invention provides the principle of filter module in nuclear power station GSS system drain tank tank level control system
Figure.
Specific embodiment
Draining system control strategy under nominal situation in the presence of the prior art is only capable of coping with some small disturbances, and
When transient condition occurs in unit, it just will appear the case where drain valve responds liquid level not in time, cause hydrophobic liquid level beyond normal
Adjustable range causes the serious problems such as GSS steam extraction is isolated or even the protection of chain triggering Steam Turbine is shut down.It is above-mentioned in order to solve
Problem, the present invention is intended to provide a kind of nuclear power station GSS system drain tank tank level control system and method, core concept are: logical
Inflow-rate of water turbine feedforward control module and liquid level closed loop control module collective effect control drain tank liquid level；Wherein, flow feedforward control
Molding block is opened loop control, and by the changes in process parameters of real time monitoring drain tank, quantitative calculating, which determines, maintains drain tank water
The first of the stable drain valve of loading amount determines aperture, guarantees that the water of drain tank is filled to just aperture is determined for controlling drain valve in time and adjusting
The stabilization of amount guarantees that big variation does not occur for drain tank liquid level, accelerates the response speed of draining system；Liquid level closed loop control module
It can guarantee that the accurate control of drain tank liquid level, export-restriction also can be avoided effectively under transient condition because hydrophobic " flash distillation " liquid level is acute
Valve caused by strong variation exceeds the problem of normal regulating band.The effect of Liquid level closed loop module is realized using level imbalance
Just aperture is determined to the valve that flow feedforward control module determines to be modified, and guarantees the liquid level control of nuclear power station GSS system drain tank
System is accurate；Flow feedforward control module and Liquid level closed loop module collective effect, so that the control of nuclear power station GSS system drain tank
System is more accurate, anti-interference is stronger.
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one, referring to fig. 2, the embodiment of the invention provides a kind of nuclear power station GSS system drain tank Liquid level systems
System, including
Flow feedforward control module 1 is used for real-time detection unit duty parameter, and according to the unit duty parameter and dredges
The characteristic curve of water valve determines that the first of drain valve for maintaining drain tank water loading amount stable determines aperture, and controls in time described hydrophobic
Valve, which is adjusted to described, just determines aperture；And
Liquid level closed loop control module 2, for according to the actual liquid level value for just determining the drain tank under aperture and setting
Deviation between level value calculates the aperture correction amount of the drain valve, and corrects the drain valve according to the aperture correction amount
Aperture so that the level stability of the drain tank.
In conjunction with Fig. 3, the present invention is hydrophobic come co- controlling by flow feedforward control module 1 and liquid level closed loop control module 2
Case liquid level；Wherein, flow feedforward control module 1 is opened loop control, fixed by the changes in process parameters of real time monitoring drain tank
Amount, which calculates, determines that the first of drain valve for maintaining drain tank water loading amount stable determines aperture, adjusts for controlling drain valve in time to just fixed
Aperture guarantees the stabilization of the water loading amount of drain tank, guarantees that big variation does not occur for drain tank liquid level, accelerates the response of draining system
Speed；Liquid level closed loop control module 2 can guarantee the accurate control of drain tank liquid level, also can effectively avoid transient state by export-restriction
It reduces because of hydrophobic liquid level mistake the problem of exceeding normal regulating band because of valve caused by hydrophobic " flash distillation " liquid level acute variation under operating condition
Height leads to the risk of Steam Turbine hang-up.The effect of Liquid level closed loop module 2 is to be realized using level imbalance to flow
The valve that feedforward control module 1 determines just is determined aperture and is modified, and guarantees that the Liquid level of nuclear power station GSS system drain tank is quasi-
Really；2 collective effect of flow feedforward control module 1 and Liquid level closed loop module, so that the control of nuclear power station GSS system drain tank
More accurately, anti-interference is stronger.
The first of the drain valve that flow feedforward control module 1 obtains determines aperture to be alternatively arranged as operator intervention GSS system hydrophobic
The reference of case liquid level can reduce operator's human-equation error and intervene improperly risk.Liquid level closed loop control module 2 can guarantee valve
The no-harass switch that door hand is automatically brought into operation.
Referring to fig. 2, the flow feedforward control module 1 includes:
First data detecting unit 11, for unit duty parameter described in real-time detection；The unit duty parameter includes
The pressure of current steam flow, drain temperature and drain tank；
First computing unit 12 is connect with the data detecting unit 11, for real-time according to the unit duty parameter
The maximum through-current capacity of current drain valve is calculated, and further calculate the maximum through-current capacity of current steam flow and current drain valve
Ratio；The ratio of the maximum through-current capacity of the current steam flow and current drain valve is that actual flow Q and valve be most in Fig. 3
Big through-current capability QmRatio, corresponding in Fig. 3 a/b operation.
Just determine aperture determination unit 13, connect with first computing unit 12, based on according to the first computing unit 12
The characteristic curve of obtained ratio inquiry drain valve, determines the first of the drain valve for maintaining the drain tank water loading amount stable
Determine aperture；It is exactly water because being spilt out through valve although acquisition is steam flow herein；And guarantee the stable method of water loading amount
It is to calculate hydrophobic valve opening, so that flow=inflow steam flow of the water of outflow；Valve stream is looked into according to current steam flow
Amount-opening curve, so that it may obtain valve opening requirements.
Filter unit 14 is connect with described except determine aperture determination unit 13, for being filtered place to determining aperture at the beginning of described
Reason improves control stability to eliminate because of the unnecessary quick variation of valve control instruction caused by measured value natural fluctuation；And
First valve regulated unit 15 is connect with the filter unit 14, is rapidly reached for controlling the drain valve
It is described just to determine aperture.
Further, the maximum through-current capacity Q of the current drain valvemCalculation formula it is as follows:
Cv=1.16KvFormula 1.1
Wherein, CvFor discharge coefficient, can be checked according to valve manufacture parameter；CfIt, can be according to valve system for critical flow coefficient
Parameter is made to check in；GfFor hydrophobic density, the following table 1 can be looked into according to drain temperature with the method for linear interpolation and checked in；ΔPsTo adjust
Valve pressure drop.Wherein, table 1 is that (water temperature-saturation pressure corresponding relationship is the T-P in Fig. 3 to water temperature-saturation pressuresCurve), water
(water temperature-density corresponding relationship is the T-G in Fig. 3 to temperature-densityfCurve) correspond to table；It is specific as follows:
Table 1
Further, the adjusting valve pressure drop Δ PsCalculation formula it is as follows:
Wherein, P1It is approximately equal with the pressure of drain tank for valve upstream pressure, it can be directly substituted into calculating process thin
The pressure of water tank is calculated；PsFor hydrophobic saturation pressure, it can be tabled look-up and 1 be looked into according to drain temperature with the method for linear interpolation
?；PcFor medium critical pressure, determined by medium type, wherein sleep critical pressure is 220.87bar a；
In conjunction with the formula 1.1, the formula 1.2 and the formula 1.3, the maximum through-current capacity Q of the current drain valvemCalculating
Formula is further as follows:
In the present embodiment, because having out radical sign operation in above-mentioned formula 1.2, formula 1.3 and formula 1.4, for the value for preventing out radical sign
There is the case where negative value, after the value for being opened radical sign is taken greatly with 0.1, then carries out next step operation.
Further, the flow feedforward control module 1 further includes the first data processing unit 16, with first data
Detection unit 11 and first computing unit 12 connection, the validity for unit duty parameter described in real-time judge；Working as
When the judging result of preceding unit duty parameter is effective, the current unit duty parameter is sent to first computing unit
12；When the judging result of current unit duty parameter is invalid, will have away from nearest previous of the current unit duty parameter
The unit duty parameter of effect is sent to first computing unit 12.
In the present embodiment, judges that the whether effective standard of current unit duty parameter is: judging current unit duty parameter
It is whether violent beyond setting range ability or jitter amplitude；Current unit duty parameter without departing from setting range ability and
It is effective when not occurring acutely shaking；When current unit duty parameter is beyond setting range ability or violent jitter amplitude, it is
In vain.
Filter unit 14, for can be avoided measuring unit data and continue by a small margin to just determining aperture and be filtered
Valve control is interfered in fluctuation after 14 operation of the first valve regulated unit；It again can valve can be fast when unit operating condition changes
Speed response.
Referring to fig. 4, the filtering principle of filter unit 14 is will just to determine aperture to be respectively fed to 2 with different filtering times
Filter module (such as filtering time is respectively 5s and 30s).Determined originally aperture it is slowly varying when, the deviation of two filter modules
Less than dead zone module threshold (such as ± 3%), the output of filter module is equal to just determine aperture after (30s) filtering for a long time
Value, value variation slowly, can guarantee that the instruction that the first valve regulated unit under accidental conditions exports is stablized；Work as unit
When quickly variation occurs for operating condition, just determining aperture, also quickly variation therewith, the deviation of two filter modules are greater than dead zone module threshold
(such as ± 3%), the at this time output of filter module are approximately equal to just determine aperture by short time (5s) filtered value, which becomes
Change comparatively fast, can guarantee the quick variation of the first valve regulated unit output order under transient condition.Filtering time parameter and dead
Area's module threshold can adjust according to the actual situation.
Further, the liquid level closed loop control module 2 includes:
Second data detecting unit 21 sets level value, actual liquid level value for drain tank described in real-time detection；Wherein,
Setting level value is provided from HMI by operator, can real-time display setting level value on HMI；Second data detecting unit
21 are also used to the actual valve position (valve opening in corresponding diagram 3 in liquid level closed loop control module) of drain valve described in real-time detection,
So as to which valve opening can be remembered when valve switches from MANUAL CONTROL mode to automatic control mode, so that switching wink
Between valve opening do not change；
Second computing unit 22 is connect, for the reality according to the drain tank with second data detecting unit 21
Deviation between border level value and the setting level value of the drain tank calculates the aperture correction amount of drain valve；Wherein, described to dredge
Deviation between the actual liquid level value of water tank and the setting level value of the drain tank can be calculated by PID module；And
Second valve regulated unit 23 is connect with second computing unit 22, for according to the aperture correction amount
The aperture of the drain valve is corrected, so that the level stability of the drain tank.
Further, the liquid level closed loop control module 2 further includes aperture correction amount limiting unit 24, with second meter
Unit 22 and the second valve regulated unit 23 connection are calculated, described in judging that second computing unit 22 is calculated
Whether aperture correction amount is located in preset range；When the aperture correction amount is located in preset range, the aperture is corrected
Amount is sent to the second valve regulated unit 23；It, will be described default when the aperture correction amount exceeds the preset range
Range is sent to the second valve regulated unit 23 close to an end value of the aperture correction amount.
Further, limitation appropriate is carried out by the output area to liquid level closed loop control module 2, valve can either be met
There is certain adjusting nargin, causes control performance to decline to avoid regulatory region part is excessive, and valve can be guaranteed in transient condition
Under without departing from linearly interval.The limitation that carries out of the output area of liquid level closed loop control module 2 is necessary；If it is defeated not limit its
Range out, then when will lead to false liquid level and occur, valve exceeds normal regulating band.Meanwhile limits value is too small can make liquid level
Control system regulating power is insufficient.Limits value needs to be adjusted according to field condition.In the present embodiment, to liquid level closed-loop control
The output area of module 2 is limited in -10% to 20% (specific value can adjust according to the actual situation), and positive limits value is higher than
Negative sense limits value is a kind of full design content to retain sovereignty over a part of the country, and original intention is to avoid drain tank liquid level is excessively high steam turbine is caused surprisingly to stop as far as possible
The appearance of machine operating condition.
Further, the liquid level closed loop control module 2 further includes the second data processing unit 25, with second data
Detection unit 21 and second computing unit 22 connection, the validity for actual liquid level value described in real-time judge；Current
When the judging result of actual liquid level value is effective, the currently practical level value is sent to second computing unit 22；?
When the judging result of currently practical level value is invalid, by the previous effective practical liquid nearest away from the currently practical level value
Place value is sent to second computing unit 22.
In the present embodiment, judges that the whether effective standard of currently practical level value is: whether judging currently practical level value
It is whether violent beyond setting range ability or jitter amplitude；Do not occur without departing from setting range ability and in currently practical level value
It is effective acutely when shake；It is invalid when currently practical level value is beyond setting range ability or violent jitter amplitude.
In conjunction with certain nuclear power plant's example, other physical constants used to needs are explained as follows:
Hydrophobic for being saturated, when flowing through regulating valve, throttle effect will lead to the hydrophobic vaporization of saturation and generate " obstruction stream ".It dredges
Water valve critical flow coefficient Cf=0.94, flow coefficient Cv=140.Under unit stabilized platform operating condition, drain temperature T
It is corresponding to be saturated hydrophobic density G at=256.51 DEG Cf=0.78905t/m3, medium critical pressure PcFor 220.87bar；Saturation pressure
Power Ps=44.318bara；Survey the pressure P of drain tank1=43.54barg, current steam flow Q=103.46t/h.
Maximum through-current capacity Q is calculated according to formula 1.4m=276.81t/h, current steam flow Q and current drain valve are most
Big through-current capacity QmRatio Q/Qm=37.4%, through look into valve flow characteristic curve obtain drain valve it is first determine aperture be 31%.And
The practical aperture for maintaining the drain valve of drain tank level stability is 29.5%, it is seen that before Liquid level closed loop module is to flow control
The correction amount for presenting module instruction is -1.5%.
Embodiment two, the present invention provides a kind of nuclear power station GSS system drain tank liquid level controlling methods, including following step
Suddenly,
Step 1: real-time detection unit duty parameter, and according to the characteristic curve of the unit duty parameter and drain valve,
It determines that the first of drain valve for maintaining drain tank water loading amount stable determines aperture, and controls the drain valve in time and adjust to described just fixed
Aperture；
Step 2: according to the deviation between the actual liquid level value for just determining the drain tank under aperture and setting level value
The aperture correction amount of the drain valve is calculated, and corrects the aperture of the drain valve according to the aperture correction amount, so that described
The level stability of drain tank.
Further, the specific implementation of the step 1 are as follows:
Step 11: unit duty parameter described in real-time detection；The unit duty parameter includes current steam flow, hydrophobic
The pressure of temperature and drain tank；
Step 12: calculating the maximum through-current capacity of current drain valve in real time according to the unit duty parameter, and further count
Calculate the ratio of the maximum through-current capacity of current steam flow and current drain valve；
Step 13: inquiring the characteristic curve of drain valve according to the ratio, determine and the drain tank water loading amount is maintained to stablize
The first of the drain valve determine aperture；
In the present embodiment, the characteristic curve of drain valve is provided by valve manufacture producer, is characterized under design conditions, valve exists
The ratio of flow and standard-sized sheet flow when each aperture, horizontal axis Q/Qm, the longitudinal axis is valve opening.Calculate Q/Qm, look into valve
Rating curve can be obtained valve and just determine aperture；
Step 14: to be calculated it is first determine aperture and be filtered, caused by eliminating because of measured value natural fluctuation
The unnecessary quick variation of valve control instruction；Step 15: controlling the drain valve and be rapidly reached and described just determine aperture.
Further, in the step 12, the maximum through-current capacity Q of the current drain valvemCalculation formula it is as follows:
Cv=1.16KvFormula 1.1
Wherein, CvFor discharge coefficient, can be checked according to valve manufacture parameter；CfIt, can be according to valve system for critical flow coefficient
Parameter is made to check in；GfFor hydrophobic density, the following table 1 can be looked into according to drain temperature with the method for linear interpolation and checked in；ΔPsTo adjust
Valve pressure drop.Wherein, table 1 is water temperature-saturation pressure, density corresponds to table；It is specific as follows:
Table 1
| Water temperature/DEG C | Saturation pressure/bar a | Density/(kg/m3) |
| 100 | 1.01 | 958.35 |
| 110 | 1.43 | 950.95 |
| 120 | 1.99 | 943.11 |
| 130 | 2.70 | 934.83 |
| 140 | 3.62 | 926.13 |
| 150 | 4.76 | 917.01 |
| 160 | 6.18 | 907.45 |
| 170 | 7.92 | 897.45 |
| 180 | 10.03 | 887.01 |
| 190 | 12.55 | 876.08 |
| 200 | 15.55 | 864.67 |
| 210 | 19.07 | 852.73 |
| 220 | 23.19 | 840.23 |
| 230 | 27.97 | 827.12 |
| 240 | 33.47 | 813.36 |
| 250 | 39.76 | 798.89 |
| 260 | 46.92 | 783.62 |
| 270 | 55.03 | 767.46 |
| 280 | 64.16 | 750.27 |
| 290 | 74.42 | 731.91 |
| 300 | 85.88 | 712.14 |
| 310 | 98.65 | 690.67 |
| 320 | 112.84 | 667.08 |
| 330 | 128.58 | 640.78 |
| 340 | 146.00 | 610.68 |
| 350 | 165.29 | 574.69 |
Further, the adjusting valve pressure drop Δ PsCalculation formula it is as follows:
Wherein, P1It is approximately equal with the pressure of drain tank for valve upstream pressure, it can be directly substituted into calculating process thin
The pressure of water tank is calculated；PsFor hydrophobic saturation pressure, it can be tabled look-up and 1 be looked into according to drain temperature with the method for linear interpolation
?；PcFor medium critical pressure, determined by medium type, wherein sleep critical pressure is 220.87bar a；
In conjunction with the formula 1.1, the formula 1.2 and the formula 1.3, the maximum through-current capacity Q of the current drain valvemCalculating
Formula is further as follows:
In the present embodiment, because having out radical sign operation in above-mentioned formula 1.2, formula 1.3 and formula 1.4, for the value for preventing out radical sign
There is the case where negative value, after the value for being opened radical sign is taken greatly with 0.1, then carries out next step operation.
Further, in the maximum for calculating the current drain valve in real time according to the unit duty parameter in the step 12
Before through-current capacity, the validity of unit duty parameter described in real-time judge is also needed；In the judging result of current unit duty parameter
When being effective, retain the current unit duty parameter；It, will be described when the judging result of current unit duty parameter is invalid
Current unit duty parameter replaces with the previous effective unit duty parameter nearest away from the current unit duty parameter.
In the present embodiment, judges that the whether effective standard of current unit duty parameter is: judging current unit duty parameter
It is whether violent beyond setting range ability or jitter amplitude；Current unit duty parameter without departing from setting range ability and
It is effective when not occurring acutely shaking；When current unit duty parameter is beyond setting range ability or violent jitter amplitude, it is
In vain.
Further, natural fluctuation may cause just calmly unit duty parameter described in real-time detection by a small margin in the step 11
Aperture fluctuation.Filter unit 16 can be eliminated and just be opened surely during normal operation by being filtered to drain valve opening value
The unnecessary fluctuation of degree, while also ensuring and just determining timely variation of the aperture under transient condition.
Further, the specific implementation of the step 2 are as follows:
Step 21: the setting level value of drain tank described in real-time detection, actual liquid level value；Wherein, setting level value is by grasping
Work person provides from HMI, can real-time display setting level value on HMI；In addition to this, it in step 21, is also dredged described in real-time detection
The actual valve position of water valve, so as to which valve can be remembered when valve switches from MANUAL CONTROL mode to automatic control mode
Aperture, so that switching moment valve opening does not change；
Step 22: according to the drift gage between the actual liquid level value of the drain tank and the setting level value of the drain tank
Calculate the aperture correction amount of the drain valve；Wherein, the setting level value of the actual liquid level value of the drain tank and the drain tank
Between deviation can be calculated by PID module；
Step 23: the aperture of the drain valve is corrected according to the aperture correction amount, so that the liquid level of the drain tank is steady
It is fixed.
Further, it is also needed before correcting the aperture of the drain valve according to the aperture correction amount in the step 23
Judge whether the aperture correction amount is located in preset range；When the aperture correction amount is located in preset range, retain institute
State aperture correction amount；When the aperture correction amount exceeds the preset range, the aperture correction value is replaced with described pre-
If range is close to an end value of the aperture correction amount.
Limitation appropriate is carried out by the output area to liquid level closed loop control module 2, can either meet valve has centainly
Adjusting nargin, cause control performance to decline to avoid regulatory region part is excessive, and can guarantee that valve does not surpass under transient condition
Linearly interval out.The limitation that carries out of the output area of liquid level closed loop control module 2 is necessary；If not limiting it exports model
It encloses, then when will lead to false liquid level and occur, valve exceeds normal regulating band.Meanwhile limits value is too small can make Liquid level
System regulating power is insufficient.Limits value needs to be adjusted according to field condition.In the present embodiment, to liquid level closed loop control module
2 output area is limited in -10% to 20% (specific value can adjust according to the actual situation), and positive limits value is higher than negative sense
Limits value is a kind of full design content to retain sovereignty over a part of the country, and original intention is to avoid drain tank liquid level is excessively high to lead to steam turbine hang-up work as far as possible
The appearance of condition.
Further, according to the actual liquid level value of the drain tank and the setting liquid level of the drain tank in the step 22
Before deviation between value calculates the aperture correction amount of the drain valve, the effective of actual liquid level value described in real-time judge is also needed
Property；When the judging result of currently practical level value is effective, retain the currently practical level value；In currently practical level value
Judging result when being invalid, the currently practical level value is replaced with to be had away from nearest previous of the currently practical level value
The actual liquid level value of effect.
In the present embodiment, judges that the whether effective standard of currently practical level value is: whether judging currently practical level value
It is whether violent beyond setting range ability or jitter amplitude；Do not occur without departing from setting range ability and in currently practical level value
It is effective acutely when shake；It is invalid when currently practical level value is beyond setting range ability or violent jitter amplitude.
Technical solution of the present invention bring technical effect is as follows
(1) aperture is determined using quantitative calculating the first of drain valve of the opened loop control link of flow feedforward control module 1, it can
The stability contorting for guaranteeing drain tank liquid level, caused by also capable of effectively avoiding under transient condition because of hydrophobic " flash distillation " liquid level acute variation
Valve exceeds the problem of normal regulating band.
(2) response speed of the drain valve under transient condition is accelerated.Technological parameter by monitoring drain tank in real time becomes
Change, control drain valve adjusted value in time and just determine aperture, drain valve is responded before liquid level variation, accelerates hydrophobic liquid
The response speed of level controlling system reduces the excessively high risk for leading to Steam Turbine hang-up of hydrophobic liquid level.
(3) automatic control level of nuclear power station is improved.Operator is at any time by valve transfer to automatic control mould
Formula, drain tank liquid level can immediate stability reach setting liquid level, enable an operator to sufficient energy and go to cope with other
System defect.
(4) just determine aperture can be used as the reference value of operator intervention GSS drain tank liquid level to calculated valve, avoid because of hand
Human-equation error risk caused by dynamic liquid level when intervening liquid level is excessively high or too low.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to restrict the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (16)
1. a kind of nuclear power station GSS system drain tank tank level control system characterized by comprising
Flow feedforward control module (1) is used for real-time detection unit duty parameter, and according to the unit duty parameter and hydrophobic
The characteristic curve of valve determines that the first of drain valve for maintaining drain tank water loading amount stable determines aperture, and controls the drain valve in time
It adjusts to described and just determines aperture；And
Liquid level closed loop control module (2), for according to the actual liquid level value for just determining the drain tank under aperture and setting liquid
Deviation between place value calculates the aperture correction amount of the drain valve, and corrects the drain valve according to the aperture correction amount
Aperture, so that the level stability of the drain tank.
2. nuclear power station GSS system drain tank tank level control system according to claim 1, which is characterized in that before the flow
Presenting control module (1) includes:
First data detecting unit (11), for unit duty parameter described in real-time detection；The unit duty parameter includes working as
The pressure of preceding steam flow, drain temperature and drain tank；
First computing unit (12) is connect with first data detecting unit (11), for being joined according to the unit operating condition
Number calculates the maximum through-current capacity of current drain valve in real time, and the maximum for further calculating current steam flow and current drain valve is logical
The ratio of flow；
Just determine aperture determination unit (13), is connect with first computing unit (12), it is single for being calculated according to described first
The characteristic curve for the ratio inquiry drain valve that first (12) calculate determines that maintain the drain tank water loading amount stable described is dredged
The first of water valve determines aperture；
Filter unit (14) is just determined aperture determination unit (13) and is connect with described, for being filtered to determining aperture at the beginning of described
Processing, to improve the stability of control；And
First valve regulated unit (15), connect with the filter unit (14), is rapidly reached for controlling the drain valve
It is described just to determine aperture.
3. nuclear power station GSS system drain tank tank level control system according to claim 2, which is characterized in that described current thin
The maximum through-current capacity Q of water valvemCalculation formula it is as follows:
Cv=1.16KvFormula 1.1
Wherein, CvFor discharge coefficient；CfFor critical flow coefficient；GfFor hydrophobic density；ΔPsTo adjust valve pressure drop.
4. nuclear power station GSS system drain tank tank level control system according to claim 3, which is characterized in that the regulating valve
Pressure drop Δ PsCalculation formula it is as follows:
Wherein, P1For valve upstream pressure；PsFor hydrophobic saturation pressure；PcFor medium critical pressure；
In conjunction with the formula 1.1, the formula 1.2 and the formula 1.3, the maximum through-current capacity Q of the current drain valvemCalculation formula
It is further as follows:
5. nuclear power station GSS system drain tank tank level control system according to claim 2, which is characterized in that before the flow
Presenting control module (1) further includes the first data processing unit (16), with first data detecting unit (11) and described the
One computing unit (12) connection, the validity for unit duty parameter described in real-time judge；In current unit duty parameter
When judging result is effective, the current unit duty parameter is sent to first computing unit (12)；In current unit
When the judging result of duty parameter is invalid, the previous effective unit operating condition nearest away from the current unit duty parameter is joined
Number is sent to first computing unit (12).
6. nuclear power station GSS system drain tank tank level control system according to claim 1, which is characterized in that the liquid level is closed
Ring control module (2) includes:
Second data detecting unit (21), for the setting level value of drain tank described in real-time detection, actual liquid level value and described
The actual valve position of drain valve；
Second computing unit (22) is connect, for the reality according to the drain tank with second data detecting unit (21)
Deviation between border level value and the setting level value of the drain tank calculates the aperture correction amount of the drain valve；And
Second valve regulated unit (23) is connect with second computing unit (22), for according to the aperture correction amount
The aperture of the drain valve is corrected, so that the level stability of the drain tank.
7. nuclear power station GSS system drain tank tank level control system according to claim 6, which is characterized in that the liquid level is closed
Ring control module (2) further includes aperture correction amount limiting unit (24), with second computing unit (22) and described second
Valve regulated unit (23) connection, for judging whether is the aperture correction amount that second computing unit (22) is calculated
In preset range；When the aperture correction amount is located in preset range, the aperture correction amount is sent to described
Two valve regulated units (23)；When the aperture correction amount exceeds the preset range, by the preset range close to described
One end value of aperture correction amount is sent to the second valve regulated unit (23).
8. nuclear power station GSS system drain tank tank level control system according to claim 6, which is characterized in that the liquid level is closed
Ring control module (2) further includes the second data processing unit (25), with second data detecting unit (21) and described
Two computing units (22) connection, the validity for actual liquid level value described in real-time judge；In the judgement of currently practical level value
When being as a result effective, the currently practical level value is sent to second computing unit (22)；In currently practical level value
Judging result when being invalid, the previous effective actual liquid level value nearest away from the currently practical level value is sent to described
Second computing unit (22).
9. a kind of nuclear power station GSS system drain tank liquid level controlling method, which comprises the following steps:
Real-time detection unit duty parameter, and dredged according to the characteristic curve of the unit duty parameter and drain valve, determining maintenance
The first of the stable drain valve of Water in Water Tank loading amount determines aperture, and controls the drain valve in time and adjust to described and just determine aperture；
Described dredge is calculated according to the deviation between the actual liquid level value for just determining the drain tank under aperture and setting level value
The aperture correction amount of water valve, and the aperture of the drain valve is corrected according to the aperture correction amount, so that the liquid of the drain tank
Stablize position.
10. nuclear power station GSS system drain tank liquid level controlling method according to claim 9, which is characterized in that the real-time inspection
Unit duty parameter is surveyed, and according to the characteristic curve of the unit duty parameter and drain valve, determining maintenance drain tank water loading amount
The first of stable drain valve determines aperture, and controls the drain valve in time and adjust to the specific implementation for just determining aperture are as follows:
Step 11: unit duty parameter described in real-time detection；The unit duty parameter includes current steam flow, drain temperature
With the pressure of drain tank；
Step 12: calculating the maximum through-current capacity of current drain valve in real time according to the unit duty parameter, and further calculate and work as
The ratio of the maximum through-current capacity of preceding steam flow and current drain valve；
Step 13: inquiring the characteristic curve of drain valve according to the ratio, determine the institute for maintaining the drain tank water loading amount stable
It states the first of drain valve and determines aperture；
Step 14: to be calculated it is first determine aperture and be filtered, to improve the stability of control；
Step 15: controlling the drain valve and be rapidly reached and described just determine aperture.
11. nuclear power station GSS system drain tank liquid level controlling method according to claim 10, which is characterized in that the step
In 12, the maximum through-current capacity Q of the current drain valvemCalculation formula it is as follows:
Cv=1.16KvFormula 1.1
Wherein, CvFor discharge coefficient；CfFor critical flow coefficient；GfFor hydrophobic density；ΔPsTo adjust valve pressure drop.
12. nuclear power station GSS system drain tank liquid level controlling method according to claim 11, which is characterized in that the adjusting
Valve pressure drop Δ PsCalculation formula it is as follows:
Wherein, P1For valve upstream pressure；PsFor hydrophobic saturation pressure；PcFor medium critical pressure；
In conjunction with the formula 1.1, the formula 1.2 and the formula 1.3, the maximum through-current capacity Q of the current drain valvemCalculation formula
It is further as follows:
13. nuclear power station GSS system drain tank liquid level controlling method according to claim 10, which is characterized in that the step
In 12 before the maximum through-current capacity for calculating the current drain valve in real time according to the unit duty parameter, real-time judge is also needed
The validity of the unit duty parameter；When the judging result of current unit duty parameter is effective, retain the current machine
Group duty parameter；When the judging result of current unit duty parameter is invalid, the current unit duty parameter is replaced with
The nearest previous effective unit duty parameter away from the current unit duty parameter.
14. nuclear power station GSS system drain tank liquid level controlling method according to claim 9, which is characterized in that described according to institute
State the aperture that the deviation between the actual liquid level value for just determining the drain tank under aperture and setting level value calculates the drain valve
Correction amount, and correct according to the aperture correction amount specific implementation of the aperture of the drain valve are as follows:
Step 21: the actual valve position for setting level value, actual liquid level value and the drain valve of drain tank described in real-time detection；
Step 22: institute is calculated according to the deviation between the actual liquid level value of the drain tank and the setting level value of the drain tank
State the aperture correction amount of drain valve；
Step 23: the aperture of the drain valve is corrected according to the aperture correction amount, so that the level stability of the drain tank.
15. the 4 nuclear power station GSS system drain tank liquid level controlling method according to claim 1, which is characterized in that the step
In 23 before correcting the aperture of the drain valve according to the aperture correction amount, also need to judge the aperture correction amount whether position
In in preset range；When the aperture correction amount is located in preset range, retain the aperture correction amount；It is repaired in the aperture
When positive quantity exceeds the preset range, the aperture correction value is replaced with into the preset range close to the aperture correction amount
One end value.
16. the 4 nuclear power station GSS system drain tank liquid level controlling method according to claim 1, which is characterized in that the step
Described dredge is being calculated according to the deviation between the actual liquid level value of the drain tank and the setting level value of the drain tank in 22
Before the aperture correction amount of water valve, the validity of actual liquid level value described in real-time judge is also needed；In sentencing for currently practical level value
When disconnected result is effective, retain the currently practical level value；When the judging result of currently practical level value is invalid, by institute
It states currently practical level value and replaces with the previous effective actual liquid level value nearest away from the currently practical level value.
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