CN110173308A - A kind of the primary frequency modulation control method and its device of steam turbine for nuclear power station - Google Patents
A kind of the primary frequency modulation control method and its device of steam turbine for nuclear power station Download PDFInfo
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- CN110173308A CN110173308A CN201910384897.5A CN201910384897A CN110173308A CN 110173308 A CN110173308 A CN 110173308A CN 201910384897 A CN201910384897 A CN 201910384897A CN 110173308 A CN110173308 A CN 110173308A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
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Abstract
The present invention relates to million kilowatt nuclear power station steam turbine control system technical fields, more particularly to the primary frequency modulation control method and its device of a kind of steam turbine for nuclear power station, wherein control method includes: to obtain and according to the load definite value of frequency modulation amount, feedback loading value and steam turbine, the control amount of steam valve is calculated, so that steam turbine adjusts the aperture of steam valve according to the control amount of steam valve；When judging that pressure feedback value is more than pressure definite value, according to the current control amount of frequency modulation amount, pressure feedback value, pressure definite value and steam valve, the new control amount for obtaining steam valve is recalculated.When pressure feedback value is more than pressure definite value, the new control amount recalculated the upper limit value set with pressure control is consistent, overcome pressure control and power control the problem of switching phase difference primary frequency modulation amount, can effectively avoid new control amount continuously fluctuate caused by steam turbine output power wild effect and the wild effect of electrical power generators power.
Description
Technical field
The present invention relates to million kilowatt nuclear power station steam turbine control system technical fields, and in particular to a kind of nuclear power station vapour
The primary frequency modulation control method and its device of turbine.
Background technique
Nuclear power is a kind of electric power resource for obtaining public acceptance instantly, is generated thermal energy by atomic nucleus chain fission and then is turned
Electric energy is turned to, which, which will not pollute air, will not cause lack of energy, and therefore, nuclear power is broadly considered cleaning, height
Effect, nexhaustible new electric energy.But compared to other power production processes, the production process of nuclear power is to nuclear energy technology, peace
Peacekeeping emergency scheduling for the national games all has a harsh requirement, some serious Nuclear Power Accidents for destroying ecological environments by nuclear power station work
Personnel tighten one's nerve constantly, it is necessary to assure the absolute safety of nuclear power production.
Currently, nuclear power unit mainly includes nuclear reactor, steam generator, steam turbine, generator and power regulation control
The equipment such as system, wherein the Steam pressure control and output power of steam turbine are two for ensureing steam turbine and working normally
Key factor, Steam pressure control here are mainly realized that effect is that control steam turbine high-pressure cylinder enters by pressure controller
The steam pressure of mouth maintains pressure definite value, and output power here is mainly realized by power controller, and effect is
The outlet output power of control steam turbine maintains load definite value.
Under normal circumstances, pressure controller and power controller can export to come about the control amount of power to steam turbine
Steam valve is adjusted, and the output power of steam turbine is controlled with this, but the upper limit control amount of pressure controller is than function
The upper limit control amount of rate controller is high, so that pressure controller plays restrictive function to power controller, usually only needs power control
Device processed, which plays adjustment effect, can maintain the normal output power of steam turbine, without the participation of pressure controller, but when in vapour
When turbine overpower is run, pressure controller will limit the control amount that power controller exports.Due to steam-turbine
The pressure feedback value of valve corresponds substantially with nuclear island thermal power, therefore pressure controller is frequently used to prevent the super function of nuclear island
Rate, in practical application, primary frequency regulation of power network requires to be likely to cause nuclear island overpower when increasing generated output, and pressure controls at this time
Device can just play a role.For example, power control will be increased if power grid requires steam turbine to increase generated output in primary frequency modulation
The control amount of device output, opens the steam valve of big steam turbine, so that pressure feedback value increases, to increase the output work of steam turbine
Rate；When pressure feedback value increases to pressure definite value, then the control amount of pressure controller output will be as the upper of power controller
Limit control amount, the control amount of limitation power controller output.
Currently, the pressure controller and power controller for participating in nuclear power unit especially exist there is also some control defects
It simulates and is found in the test of primary frequency modulation, when primary frequency modulation requires generated output to increase 50MW, pressure controller will be because of over-voltage
And play a role at once, the control amount of power controller output is limited, constantly power controller can be caused to export at this time
Control amount be greater than pressure controller output upper limit control amount, also constantly cause pressure feedback value be more than pressure controller pressure
Power definite value finally causes the output power of steam turbine the phenomenon that continuing fluctuation occur, and cause the generator of rear end
Also there is fluctuation in generated output.This control defect is brought hidden for the Steam pressure control and output power of steam turbine
Suffer from, will affect the carefree transition effect between power controller and pressure controller, also will affect the output power of steamer device
Stability.
Summary of the invention
The present invention solves the technical problem of how to overcome existing steam turbine output power in primary frequency modulation to continue
The phenomenon that fluctuation.In order to solve the above technical problems, the application provide a kind of steam turbine for nuclear power station primary frequency modulation control method and
Its device.
According in a first aspect, provide a kind of primary frequency modulation control method of steam turbine for nuclear power station in a kind of embodiment, including
Following steps:
Frequency modulation amount when primary frequency modulation is obtained, and continuously acquires the feedback loading value of steam turbine and the pressure of steam valve
Value of feedback；
According to the frequency modulation amount, the load definite value of the feedback loading value and the steam turbine, the steam is calculated
The control amount of valve, so that the steam turbine adjusts the aperture of the steam valve according to the control amount of the steam valve；
When judging that the pressure feedback value is more than pressure definite value, according to the frequency modulation amount, the pressure feedback value, described
The current control amount of pressure definite value and the steam valve recalculates the new control amount for obtaining the steam valve, so that institute
The aperture that steam turbine adjusts the steam valve according to the new control amount of the steam valve is stated, to adjust the defeated of the steam turbine
Power match is in the power load of primary frequency modulation out.
It is described according to the frequency modulation amount, the load definite value of the feedback loading value and the steam turbine, be calculated described
The control amount of steam valve, comprising: the instruction in response to user enters the first control model；Under first control model,
The frequency modulation amount, the sum of the load definite value are compared with the feedback loading value, obtain the first comparison result；According to institute
It states the first comparison result and determines the first output quantity；It generates to obtain the steam valve according to first output quantity and the frequency modulation amount
The control amount of door, the control amount of the steam valve are used to adjust the aperture of the steam valve to change the pressure feedback
Value.
It is described judge the pressure feedback value be more than pressure definite value when, according to the frequency modulation amount, the pressure feedback value,
The current control amount of the pressure definite value and the steam valve recalculates the new control amount for obtaining the steam valve, packet
It includes: according to the frequency modulation amount, the pressure feedback value, the current control amount of the pressure definite value and the steam valve, calculating
The first upper limit value is obtained, first upper limit value is used to carry out upper limit export-restriction to first output quantity；According to described
One upper limit value generates to obtain the new control amount of the steam valve.
It is described judge the pressure feedback value be more than pressure definite value when, according to the frequency modulation amount, the pressure feedback value,
The current control amount of the pressure definite value and the steam valve, is calculated the first upper limit value, comprising: by the pressure feedback
Value is compared with the pressure definite value, obtains the second comparison result；The pressure controller is current by the steam valve
The difference of control amount and the frequency modulation amount is compared with second comparison result, obtains the second output quantity；By described second
Output quantity, the sum of the frequency modulation amount are as first upper limit value.
It is described according to the frequency modulation amount, the load definite value of the feedback loading value and the steam turbine, be calculated described
The control amount of steam valve, comprising: the instruction in response to user enters the second control model；Under second control model,
According to the load definite value and the frequency modulation amount and generate and obtain the control amount of the steam valve.
It is described judge the pressure feedback value be more than pressure definite value when, according to the frequency modulation amount, the pressure feedback value,
The current control amount of the pressure definite value and the steam valve recalculates the new control amount for obtaining the steam valve, packet
It includes: under second control model, being compared the pressure feedback value and the pressure definite value by a pressure controller
Compared with obtaining the second comparison result；The difference of the current control amount of the steam valve and the frequency modulation amount and described second are compared
Relatively result is compared, and obtains the second output quantity, generates to obtain the second upper limit value according to second output quantity, on described second
Limit value is used to carry out upper limit export-restriction to the control amount of the steam valve；According to second upper limit value, the frequency modulation amount
And generate obtain the control amount of the steam valve.
The difference of the frequency modulation amount revolving speed definite value and speed feedback value of the steam turbine when being primary frequency modulation is relative to full
The percentage of idling speed, feedback loading value, the load definite value of the steam turbine are the full load relative to the steam turbine
Percentage, pressure feedback value, the pressure definite value of the steam valve are the percentage of the loading pressure relative to steam valve
Number.
According to second aspect, a kind of primary frequency modulation control device of steam turbine for nuclear power station is provided in a kind of embodiment, comprising:
Acquiring unit, for obtaining frequency modulation amount when primary frequency modulation, and continuously acquire steam turbine feedback loading value and
The pressure feedback value of steam valve；
Control unit is connect with the acquiring unit, for according to the frequency modulation amount, the feedback loading value and the vapour
The load definite value of turbine, is calculated the control amount of the steam valve, so that the steam turbine is according to the steam valve
Control amount adjusts the aperture of the steam valve；Described control unit is also used to judging that the pressure feedback value is fixed more than pressure
When value, according to the frequency modulation amount, the pressure feedback value, the current control amount of the pressure definite value and the steam valve, weight
The new control amount of the steam valve is newly calculated, so that the steam turbine is adjusted according to the new control amount of the steam valve
The aperture of the steam valve, to adjust the power load that the output power of the steam turbine is matched with primary frequency modulation.
Described control unit includes switch controller, power controller and pressure controller；
The switch controller be used to selecting in response to the instruction of user the power controller, the pressure controller into
Enter the first control model or the second control model；
The power controller is used under the first control model, according to the frequency modulation amount, the feedback loading value and institute
The load fixed value calculation for stating steam turbine obtains the control amount of the steam valve, and the control amount of the steam valve is for adjusting institute
The aperture of steam valve is stated to change the pressure feedback value；
The pressure controller is used under the first control model, when judging that the pressure feedback value is more than pressure definite value,
According to the frequency modulation amount, the pressure feedback value, the current control amount of the pressure definite value and the steam valve, it is calculated
First upper limit value, first upper limit value are used to carry out upper limit export-restriction to the control amount of the steam valve；
The pressure controller is also used under the second control model, judges that the pressure feedback value is more than pressure definite value
When, according to the current control amount of steam valve described in the frequency modulation amount, the pressure feedback value, the pressure definite value, calculate
To the second upper limit value, second upper limit value is used to carry out upper limit export-restriction to the control amount of the steam valve.
According to the third aspect, a kind of calculation machine readable storage medium storing program for executing, including program, described program energy are provided in a kind of embodiment
It is enough executed by processor to realize method described in above-mentioned first aspect.
The beneficial effect of the application is:
According to a kind of primary frequency modulation control method and its device for steam turbine of above-described embodiment, wherein frequency modulation control
Method includes: frequency modulation amount when obtaining primary frequency modulation, and continuously acquires the feedback loading value of steam turbine and the pressure of steam valve
Force feedback value；According to the load definite value of frequency modulation amount, feedback loading value and steam turbine, the control amount of steam valve is calculated, makes
Obtain the aperture that steam turbine adjusts steam valve according to the control amount of steam valve；Judging that pressure feedback value is more than pressure definite value
When, according to the current control amount of frequency modulation amount, pressure feedback value, pressure definite value and steam valve, recalculate to obtain steam valve
New control amount so that steam turbine according to the new control amount of steam valve adjust steam valve aperture, to adjust steam turbine
Output power is matched with the power load of primary frequency modulation.In a first aspect, due to when pressure feedback value is more than pressure definite value, again
The new control amount the being calculated upper limit value set with pressure control is consistent, and overcomes pressure control and power control exists
Switch phase difference primary frequency modulation amount the problem of, can effectively avoid new control amount continuously fluctuate caused by steam turbine output power not
The wild effect of stabilization and electrical power generators power；Second aspect, due to using pressure when pressure feedback value is excessive
Power controls to limit power control, enables steam turbine to always work at safe operation state, even if answering in primary frequency modulation
With the aperture that also can accurately adjust steam valve in scene, it is unlikely to the valve that primary frequency modulation requirement power increases and causes occur
The excessive situation of pressure afterwards；The third aspect, since when downstream pressure occurs shortly past big situation, the upper limit value of pressure control can be very
Current control amount is followed well, enables the system to smoothly transition to pressure control, to guarantee power control and pressure
The handoff procedure of power control achievees the effect that no-harass switch；Fourth aspect, due to introducing the first control model and the second control
Mode allows user to select one of control mode according to actual needs to control to the output power of steam turbine
System automatically controls and manually controls the control function laid equal stress on conducive to realizing, enriches systematic difference scene.
Detailed description of the invention
Fig. 1 is the structure chart in the first control model frequency modulation control device next time；
Fig. 2 is the structure chart in the second control model frequency modulation control device next time；
Fig. 3 is the flow chart of primary frequency modulation control method；
Fig. 4 is the flow chart that the control amount of steam valve is obtained under the first control model；
Fig. 5 is the flow chart that the control amount of steam valve is obtained under the second control model；
Fig. 6 is the test effect schematic diagram of primary frequency modulation control method in prior art；
Fig. 7 is the test effect schematic diagram of primary frequency modulation control method in technical scheme.
Specific embodiment
Below by specific embodiment combination attached drawing, invention is further described in detail.Wherein different embodiments
Middle similar component uses associated similar element numbers.In the following embodiments, many datail descriptions be in order to
The application is better understood.However, those skilled in the art can recognize without lifting an eyebrow, part of feature
It is dispensed, or can be substituted by other elements, material, method in varied situations.In some cases, this Shen
Please it is relevant it is some operation there is no in the description show or describe, this is the core in order to avoid the application by mistake
More descriptions are flooded, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary, they
Relevant operation can be completely understood according to the general technology knowledge of description and this field in specification.
It is formed respectively in addition, feature described in this description, operation or feature can combine in any suitable way
Kind embodiment.Meanwhile each step in method description or movement can also can be aobvious and easy according to those skilled in the art institute
The mode carry out sequence exchange or adjustment seen.Therefore, the various sequences in the description and the appended drawings are intended merely to clearly describe a certain
A embodiment is not meant to be necessary sequence, and wherein some sequentially must comply with unless otherwise indicated.
It is herein component institute serialization number itself, such as " first ", " second " etc., is only used for distinguishing described object,
Without any sequence or art-recognized meanings.And " connection ", " connection " described in the application, unless otherwise instructed, include directly and
It is indirectly connected with (connection).
For the technical solution for clearly demonstrating the application, some technical terms will be illustrated here.
Primary frequency modulation refers to the frequency of power grid when offrating, and control system, which automatically controls generating set, to be had
The increase and decrease of function power makes mains frequency maintain stable automatic control process to limit mains frequency variation.When mains frequency liter
Gao Shi, primary frequency function will require generating set quickly to reduce load, on the contrary, it is desirable that generating set quicklys increase load；And
And when primary frequency modulation occurs, the speed-regulating system of steam turbine will spontaneously produce frequency modulation amount according to the variation of mains frequency to adjust
The output power of steam turbine is to restore mains frequency.In addition, it should be noted that, the frequency of power grid is by electrical power generators power
It is codetermined with power load size, wherein the generated output of generator is determined by the output power of steam turbine；Work as power generation
Mains frequency is stablized when power and power load are equal in magnitude, and when generated output is greater than power load, mains frequency is increased, when
Mains frequency reduces when generated output is less than power load.
Present invention design is: when steam turbine works normally, the control of steam valve is obtained by power control
Amount processed, to change the aperture of steam valve and the output power of steam turbine, while the pressure for detecting steam valve at any time is anti-
Feedback value (i.e. downstream pressure) is always ensured that downstream pressure is no more than pressure definite value；It requires to increase the defeated of steam turbine in primary frequency modulation
Out when power, the aperture of steam valve will increase by the method for power control and increase downstream pressure, judging that pressure is anti-
When feedback value is more than pressure definite value, the upper limit value of power control is just generated by pressure control, guarantees power control and pressure control
Between no-harass switch effect, also guarantee that downstream pressure is maintained always in a safe range, enhancing steam turbine is adjusted to primary
Situation adaptibility to response when taking place frequently raw.And the application's it is critical that reset power control and pressure control between
Switch control logic, to reach no-harass switch effect, in addition, guaranteed by newly-increased control model steam turbine automatically controlling and
Manually control the job stability under state.
The claimed technical solution of the application is illustrated below in conjunction with embodiment.
Embodiment one,
Fig. 1 and Fig. 2 are please referred to, the application discloses a kind of primary frequency modulation control device of steam turbine for nuclear power station comprising obtains
Unit 11, control unit 12 are taken, will be illustrated respectively below.
Acquiring unit 11 is used for frequency modulation amount when obtaining primary frequency modulation, and continuously acquire steam turbine feedback loading value and
The pressure feedback value of steam valve.
It should be noted that power grid often may require that steam turbine increases or decreases revolving speed to change when primary frequency modulation occurs
Output power, to match the power load of power grid by changing output power.So, in the present embodiment, it obtains primary
The frequency modulation amount of frequency modulation is namely based on revolving speed definite value and the speed feedback value of steam turbine to be calculated, and requires to increase in primary frequency modulation
When power or reduction power, the revolving speed definite value of steam turbine can be reset according to the size of target power, then pass through revolving speed
The comparison result of value of feedback and revolving speed definite value determines frequency modulation amount when primary frequency modulation.
In the present embodiment, the feedback loading value of steam turbine is by being set to the machine output power measuring instrument of steam turbine end
Device is acquired in real time, then feeds back to acquiring unit 11 by digital signal.The pressure feedback value of steam valve is by being set to
Bourdon gauge device is acquired in real time after the valve of steam turbine front end, then feeds back to acquiring unit by digital signal
11。
In the present embodiment, acquiring unit 11 can also obtain pressure definite value, load definite value and revolving speed definite value, these numerical value
Be to maintain the call parameter that works in rated condition of steam turbine, set by user, in primary frequency modulation generating process those
Numerical value will not usually change.
Control unit 12 is connect with acquiring unit 11, for fixed according to the load of frequency modulation amount, feedback loading value and steam turbine
Value, is calculated the control amount of steam valve, so that steam turbine adjusts the aperture of steam valve according to the control amount of steam valve；
In addition, control unit is also used to when judging that pressure feedback value is more than pressure definite value, according to frequency modulation amount, pressure feedback value, pressure
The current control amount of definite value and steam valve recalculates the new control amount for obtaining steam valve, so that steam turbine is according to steam
The new control amount of valve adjusts the aperture of steam valve, with adjust the output power of steam turbine be matched with primary frequency modulation electricity consumption it is negative
Lotus.
In one embodiment, referring to Fig. 1 and Fig. 2, control unit 12 includes switch controller 125, power controller
123 and pressure controller 127, it is respectively described below.
Switch controller 125 is arranged on the outlet line of power controller 123, pressure controller 127, is mainly used for responding
Enter the first control model or the second control model in instruction selection power controller 123, the pressure controller 127 of user.?
In the present embodiment, the first control model is automatic control mode, is generated with power controller 123 and pressure controller 127
The control amount of steam valve, the second control model are MANUAL CONTROL mode, are born with pressure controller 127 with set by user
Lotus definite value generates the control amount of steam valve.
Power controller 123 is used under the first control model, according to the load of frequency modulation amount, feedback loading value and steam turbine
Fixed value calculation obtains the control amount of steam valve, in the application the control amount of steam valve be used to adjust the aperture of steam valve with
Change pressure feedback value；
Pressure controller 127 is used under the first control model, when judging that pressure feedback value is more than pressure definite value, according to tune
Frequency amount, the current control amount of pressure feedback value, pressure definite value and steam valve, are calculated the first upper limit value, and here first
Upper limit value is used to carry out upper limit export-restriction to the first output quantity of power controller 123.In addition, pressure controller is also used to
Under second control model, when judging that pressure feedback value is more than pressure definite value, steamed according to frequency modulation amount, pressure feedback value, pressure definite value
The current control amount of steam valve door, is calculated the second upper limit value, and the second upper limit value here is used to carry out the upper limit to load definite value
Export-restriction.
Further, load definite value and frequency modulation amount are done by being done when the first logic module 121 and operation and result pass
It carries out doing difference operation with feedback loading value when transporting to the second logic module 122, the first comparison result obtained after difference operation will be done
It is transmitted to power controller 123.Power controller 123 can export the first control amount according to the first comparison result, first control
It carries out doing difference operation, the amount of being automatically controlled with frequency modulation amount when amount reaches third logic module 124；Automatic control amount is in the first control
Molding formula is transmitted to switch controller when starting, switch controller generates the first control amount, the first control according to the automatic control amount
When amount processed is transmitted to four logic modules 126 and frequency modulation amount is done and operation, obtains the second control amount, second control amount is just
It is the control amount of the steam valve of steam turbine and the current control amount of steam valve.
Further, pressure definite value and pressure feedback value are input to pressure controller 127, obtain second more afterwards and compare knot
Fruit, meanwhile, switch controller 125 export the first control amount (i.e. the difference of the current control amount Yu frequency modulation amount of steam valve,
It is represented by the first control amount=the second control amount-frequency modulation amount) it is transmitted to pressure controller 127, it is more than pressure in pressure feedback value
When power definite value, pressure controller 127 makes the difference the first control amount and the second comparison result, obtains the second output quantity；Second
When output quantity passes through five logic modules 128 and frequency modulation amount is done and operation, obtains the first upper limit value, first upper limit value is defeated
Enter to power controller 123, the first output quantity exported to power controller 123 is subjected to upper limit export-restriction；And second is defeated
Output when being input to switch controller 125 as the second upper limit value, second upper limit value switch controller 125 is exported
One control amount carries out upper limit export-restriction.In addition, load definite value forms the amount of manually controlling when being transmitted to switch controller 125, it should
The amount of manually controlling by switch controller 125 and will generate the first control amount when the second control model is enabled.
Further, since the second control amount of the 4th logic module 126 output may not be by the steam valve of steam turbine
Received, it is therefore desirable to be converted into the acceptable aperture logical signal of steam valve institute.In the present embodiment, in the 4th logic mould
Second control amount can be converted into steam valve by the rear end setting signal conversion module 14 of block 126, the signal conversion module 14
The 13 third control amounts for identifying and receiving, to control the aperture of steam valve 13 by third control amount.In steam valve
When the aperture of door 13 changes, the variation of downstream pressure will make the revolving speed of steam turbine change, to change steam turbine
The machine output power in exit further changes the revolving speed of generator, the final generated output and electricity for influencing generator
The power load of net.
Wherein, when the instruction that switch controller 125 responds user accesses the first control model, that is, enter and automatically control mould
When formula, the logical relation in Fig. 1 can refer to, switch controller 125 no longer receives the amount of manually controlling from load definite value, also not
The first control amount can be generated according to the amount of manually controlling.The second control model is accessed in the instruction that switch controller 125 responds user
When, that is, when entering MANUAL CONTROL mode, it can refer to the logical relation in Fig. 2, switch controller 125 is no longer received and patrolled from third
The automatic control amount of module 124 is collected, also will not generate the first control amount according to automatic control amount, power controller will not at this time
It plays a role again.
In the present embodiment, control unit 12 may also include rotational speed governor 120, and it is anti-that rotational speed governor 120 receives revolving speed
Feedback value and revolving speed definite value are calculated frequency modulation amount by the comparison result that makes the difference of speed feedback value and revolving speed definite value, and then will adjust
Frequency amount is transmitted to the first logic module 121, the 4th logic module 126, the 5th logic module 128.
In the present embodiment, power controller 123 can integrate the first logic module 121, the second logic module 122,
Three logic modules 124, can also each self-forming logic control unit；Pressure controller 127 can integrate the 5th logic module
128, it can also each self-forming logic control unit；Switch controller 125 can integrate the 4th logic module 126, signal conversion
Module, can also each self-forming logic control unit.In addition, it should be noted that, each logic control in control unit 12
Component can be computer software module, be also possible to the entity hardware with identity logic function, here with no restrictions；If
If being computer software module, then control unit 12 can be executed by processor to realize control function.
In the present embodiment, the revolving speed definite value of steam turbine is opposite with the difference of speed feedback value when frequency modulation amount is primary frequency modulation
In the percentage of fully loaded revolving speed, then revolving speed definite value, speed feedback value are also the percentage of the fully loaded revolving speed relative to steam turbine.
In addition, the feedback loading value of steam turbine, load definite value are the percentage of the full load relative to steam turbine, steam valve
Pressure feedback value, pressure definite value are the percentage of the loading pressure relative to steam valve.It follows that institute in the present embodiment
The some calculation amounts being related to, such as the first comparison result, the second comparison result, the first output quantity, the second output quantity, first upper limit
Value, the second upper limit value, the first control amount, the second control amount are percentage.
Embodiment two,
Referring to FIG. 3, the application discloses a kind of nuclear power disclosed in embodiment one on the basis of primary frequency modulation control device
It stands the primary frequency modulation control method of steam turbine comprising step S210-S260 illustrates separately below.
Step S210, control unit 12 obtain primary frequency modulation when frequency modulation amount, and continuously acquire steam turbine load it is anti-
The pressure feedback value of feedback value and steam valve.
In the present embodiment, the revolving speed definite value of steam turbine is opposite with the difference of speed feedback value when frequency modulation amount is primary frequency modulation
In the percentage of fully loaded revolving speed, feedback loading value, the load definite value of steam turbine are hundred of the full load relative to steam turbine
Score, pressure feedback value, the pressure definite value of steam valve are the percentage of the loading pressure relative to steam valve.
Steaming is calculated according to the load definite value of frequency modulation amount, feedback loading value and steam turbine in step S220, control unit 12
The control amount of steam valve door, so that steam turbine adjusts the aperture of steam valve according to the control amount of steam valve.
Step S230, control unit 12 judge whether pressure feedback value is more than pressure definite value, if then entering step S240,
Otherwise enter step S230.
Step S240, control unit 12 is when judging that pressure feedback value is more than pressure definite value, according to frequency modulation amount, pressure feedback
Value, the current control amount of pressure definite value and steam valve, recalculate the new control amount for obtaining steam valve；
Step S250, control unit 12 adjusts the aperture of the steam valve of steam turbine according to new control amount, so as to adjust steaming
The downstream pressure of steam valve door, and the adjustment output power of steam turbine, the generated output of generator, the electricity consumption of power grid are negative by the way
The output power of lotus, final adjustment steam turbine is matched with the power load of primary frequency modulation.At this point, making after the valve of steam valve
Control unit 12 can be adjusted accurately and in time steam valve in the excessive situation of pressure.
Step S260 adjusts the aperture of the steam valve of steam turbine according to the current control amount that step S220 is calculated,
So as to adjust the downstream pressure of steam valve, and the output power of steam turbine, the generated output of generator, power grid are adjusted by the way
Power load, the output power of final adjustment steam turbine is matched with the power load of primary frequency modulation.At this point, making in steam valve
Control unit 12 can adjust accurately and in time steam valve in the case that the downstream pressure of door is in safe allowed band
Section.
Referring to FIG. 4, in a specific embodiment, step S220 may include step S221-S224, and step S240 can
Including step S241-S242, it is respectively described below.
Step S221 is shown in that Fig. 1, switch controller 125 enter the first control model in response to the instruction of user, that is, enters certainly
Dynamic control model.
Step S222, under the first control model, the first logic module 121 and the second logic module 122 are jointly by frequency modulation
Compared with amount, the sum of load definite value are made the difference with feedback loading value, the first comparison result is obtained.
Step S223, power controller 123 obtain the first output quantity of identical percentage amounts according to the first comparison result.
Step S224, third logic module 124 and the 4th logic module 126 are jointly raw according to the first output quantity and frequency modulation amount
It at the control amount of steam valve is obtained, that is, generates and obtains the second control amount, the control amount of steam valve here is steamed for adjusting
The aperture of steam valve door is to change pressure feedback value.
Next, pressure controller 127 enters step S241 when judging that pressure feedback value is more than pressure definite value.
Step S241, pressure controller 127 and the 5th logic module 128 are jointly according to frequency modulation amount, pressure feedback value, pressure
The current control amount of definite value and steam valve, is calculated the first upper limit value, which is used for power controller 123
The first output quantity carry out upper limit export-restriction.
For example, seeing Fig. 1, compared with pressure controller 127 is made the difference pressure definite value with pressure feedback value, the second ratio is obtained
Relatively result；Then, by the difference of the current control amount of steam valve and frequency modulation amount, (i.e. the second control amount subtracts pressure controller 127
Obtained first control amount of frequency modulation removal amount) made the difference with the second comparison result compared with, obtain the second output quantity；Finally, the
Five logic modules 128 are using the second output quantity, the sum of frequency modulation amount as the first upper limit value.
Step S242 generates to obtain the new control amount of steam valve according to the first upper limit value.Specifically, power controller
123 are exported according to the first upper limit value and generate the first output quantity with sizes such as the first upper limit values, third logic module 128
First output quantity and frequency modulation amount are done into the difference operation amount of being automatically controlled, the output of switch controller 125 and automatic control amount etc. are big
First control amount and frequency modulation amount are done and obtain the second control amount with operation by the first small control amount, the 4th logic module 126.
Following formula can be used to indicate step here in conjunction with Fig. 1 for the technical principle that technical scheme is expressly understood
Numerical relation in rapid S241 and step S242.
One: the second output quantity of formula=the first control amount-(pressure definite value-pressure feedback value)
Two: the first control amounts of formula=automatic control amount=the first output quantity-frequency modulation amount
Three: the first upper limit value of formula=the second output quantity+frequency modulation amount
Finally, available according to numerical relation above: (pressure definite value-pressure is anti-for the first upper limit value=the first output quantity-
Feedback value).
So, when downstream pressure is just excessive, pressure feedback value is equal to pressure definite value, so that the first upper limit value=
First output quantity；That is, can guarantee that the first output quantity is exactly equal to when pressure feedback value is just above pressure definite value
First upper limit value realizes the switching undisturbed that power control is controlled to pressure, without the first output quantity and first upper limit
The case where there are deviations between value, the second control amount (the second control amount=the first control amount+frequency modulation when being conducive to eliminate rigid switching
Measure the=the first output quantity-frequency modulation amount+frequency modulation amount=first output quantity) fluctuation situation.In addition, switch to after pressure control,
With the increase of pressure feedback value, the first output quantity (the first output quantity=the first upper limit value+pressure definite value-pressure feedback value) by
It is decrescence small, cause the second control amount to be also gradually reduced, so that the aperture of steam valve be forced to become smaller, limits the increasing of downstream pressure
Add.
When primary frequency modulation is completed, i.e., it is zero that frequency modulation amount is gradually smaller, then the second control amount reduces, the aperture of steam valve
Become smaller, pressure feedback value is also decreased to pressure definite value therewith, guarantees that the first upper limit value is equal to the first output quantity again.And work as pressure
When value of feedback is less than pressure definite value, the first upper limit value will no longer work to power controller 123, be controlled at this time by pressure automatic
Power control is switched to, meets the second output quantity=first output quantity=load definite value, then the first output quantity is by load definite value
It is adjusted with the comparison of feedback loading value.
Referring to FIG. 5, in another specific embodiment, step S220 may include step B221-B222, and step S240
It may include step B241-B243, be respectively described below.
Step B221 is shown in that Fig. 2, switch controller 125 enter the second control model in response to the instruction of user, that is, enter hand
Dynamic control model.
Step B222, under the second control model, switch controller 125 and the 4th logic module 126 are generated jointly and are obtained
The control amount (i.e. the second control amount) of steam valve.Specifically, switch controller 125 receives manually controlling from load definite value
The first control amount and frequency modulation amount are done and are obtained with operation by the first control amount of the sizes such as output, the 4th logic module 126 after amount
To the second control amount.
Next, pressure controller 127 enters step B241 when judging that pressure feedback value is more than pressure definite value.
Pressure feedback value is compared by step B241, pressure controller 127 with pressure definite value, is obtained second and is compared knot
Fruit.
Step B242, by the difference of the current control amount of steam valve and frequency modulation amount, (i.e. first controls pressure controller 127
Amount) made the difference with the second comparison result compared with, obtain the second output quantity, generated to obtain second upper limit according to the second output quantity
Value, second upper limit value are used to carry out upper limit export-restriction to the control amount of steam valve.
Step S243, switch controller 125 and the 4th logic module 126 are jointly according to the second upper limit value, the sum of frequency modulation amount
Generation obtains the control amount (i.e. the second control amount) of steam valve.Specifically, switch controller 125 is carried out according to the second upper limit value
First control amount of the sizes such as output and generation, the 4th logic module 126 is by the second upper limit value and frequency modulation amount is done and operation
After obtain the second control amount.
Following formula can be used to indicate step here in conjunction with Fig. 2 for the technical principle that technical scheme is expressly understood
Numerical relation in rapid B241 and step B243.
One: the second output quantity of formula=the first control amount-(pressure definite value-pressure feedback value)
Two: the second upper limit value of formula=the second output quantity
Finally, available according to numerical relation above: (pressure definite value-pressure is anti-for the second upper limit value=the first control amount-
Feedback value).
So, when downstream pressure is just excessive, pressure feedback value is equal to pressure definite value, and the first control amount is fixed equal to load
Value, so that the second upper limit value=load definite value；That is, when pressure feedback value is just above pressure definite value, it can
Guarantee that load definite value is exactly equal to the second upper limit value, realizes the switching undisturbed effect that power control is controlled to pressure, without
There is the case where there are deviations between the first output quantity and the second upper limit value, the second control amount is (rigid when being conducive to eliminate rigid switching
When switching, the second control amount=the first control amount+frequency modulation amount=load definite value+frequency modulation amount) fluctuation situation.In addition, switching to
After pressure control, with the increase of pressure feedback value, the first control amount (the first control amount=the first upper limit value+pressure definite value-
Pressure feedback value) it is gradually reduced, cause the second control amount to be also gradually reduced, so that the aperture of steam valve be forced to become smaller, limits
The increase of downstream pressure.
When primary frequency modulation is completed, i.e., frequency modulation amount is zero, then the second control amount reduces, and the aperture of steam valve becomes smaller, and is pressed
Force feedback value is also decreased to pressure definite value therewith, guarantees that the first upper limit value is equal to the first output quantity again.And work as pressure feedback value
When less than pressure definite value, the second upper limit value will no longer work to switch controller 125, be automatically switched at this time by pressure control
Power control (power control is using load definite value as reference quantity at this time) meets the second output quantity=first output quantity=load
Definite value, then the first output quantity is adjusted by load definite value.
For the excellent effect for further appreciating that technical solution provided herein, comparative test has been carried out here, has been detailed in
Fig. 6 and Fig. 7.Wherein, Fig. 6 is the test effect schematic diagram of primary frequency modulation control method in prior art, and Fig. 7 is the application
The test effect schematic diagram of primary frequency modulation control method is to primary frequency modulation control method in prior art in technical solution
The difference of test effect, both technical solutions is: directly using the second output quantity as power control in prior art
First upper limit value of device 123, and using the sum of the second output quantity and frequency modulation amount as the first upper limit value in present techniques mode.
From fig. 6, it can be seen that the second output quantity of pressure controller output and the first output of power controller output
There is biggish fluctuation situation in amount, this is because when switching just occurs, the second output quantity and power of pressure controller output
For first output quantity of controller output not in the same point, the two differs primary frequency modulation amount, and the point of pressure controller tracking compares
Primary frequency modulation item has been lacked in the output of power controller, causes the output of pressure controller using lower value as initial output, wink
When dragged down the output of power controller, cause power control and pressure control between there are unstability, be repeated continuously and cut
It changes caused by process.
From figure 7 it can be seen that the second output quantity of pressure controller output and the first output of power controller output
There is only very small fluctuations for amount, and the second output quantity of pressure controller output follows power controller output always
First output quantity.The output of the point and power controller of the pressure controller tracking is on the same point, and there is no differences one
The situation of secondary frequency modulation item is conducive to the stability of the stability for maintaining output quantity and the downstream pressure for maintaining steam valve, together
When conducive to maintain steam turbine output power stability.
It will be understood by those skilled in the art that all or part of function of various methods can pass through in above embodiment
The mode of hardware is realized, can also be realized by way of computer program.When function all or part of in above embodiment
When being realized by way of computer program, which be can be stored in a computer readable storage medium, and storage medium can
To include: read-only memory, random access memory, disk, CD, hard disk etc., it is above-mentioned to realize which is executed by computer
Function.For example, program is stored in the memory of equipment, when executing program in memory by processor, can be realized
State all or part of function.In addition, when function all or part of in above embodiment is realized by way of computer program
When, which also can store in storage mediums such as server, another computer, disk, CD, flash disk or mobile hard disks
In, through downloading or copying and saving into the memory of local device, or version updating is carried out to the system of local device, when logical
When crossing the program in processor execution memory, all or part of function in above embodiment can be realized.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (10)
1. a kind of primary frequency modulation control method of steam turbine for nuclear power station, which comprises the following steps:
Frequency modulation amount when primary frequency modulation is obtained, and continuously acquires the feedback loading value of steam turbine and the pressure feedback of steam valve
Value；
According to the frequency modulation amount, the load definite value of the feedback loading value and the steam turbine, the steam valve is calculated
Control amount so that the steam turbine adjusts the aperture of the steam valve according to the control amount of the steam valve；
When judging that the pressure feedback value is more than pressure definite value, according to the frequency modulation amount, the pressure feedback value, the pressure
The current control amount of definite value and the steam valve recalculates the new control amount for obtaining the steam valve, so that the vapour
Turbine adjusts the aperture of the steam valve according to the new control amount of the steam valve, to adjust the output work of the steam turbine
Rate is matched with the power load of primary frequency modulation.
2. primary frequency modulation control method as described in claim 1, which is characterized in that it is described according to the frequency modulation amount, it is described negative
The load definite value of lotus value of feedback and the steam turbine, is calculated the control amount of the steam valve, comprising:
Instruction in response to user enters the first control model；
Under first control model, the frequency modulation amount, the sum of the load definite value are compared with the feedback loading value
Compared with obtaining the first comparison result；
The first output quantity is determined according to first comparison result；
It generates to obtain the control amount of the steam valve according to first output quantity and the frequency modulation amount, the steam valve
Control amount is used to adjust the aperture of the steam valve to change the pressure feedback value.
3. primary frequency modulation control method as claimed in claim 2, which is characterized in that described to judge that the pressure feedback value is super
When excess pressure definite value, according to the current control of the frequency modulation amount, the pressure feedback value, the pressure definite value and the steam valve
Amount processed recalculates the new control amount for obtaining the steam valve, comprising:
When judging that the pressure feedback value is more than pressure definite value, according to the frequency modulation amount, the pressure feedback value, the pressure
The current control amount of definite value and the steam valve, is calculated the first upper limit value, and first upper limit value is used for described the
One output quantity carries out upper limit export-restriction；
It is generated to obtain the new control amount of the steam valve according to first upper limit value.
4. primary frequency modulation control method as claimed in claim 3, which is characterized in that described to judge that the pressure feedback value is super
When excess pressure definite value, according to the current control of the frequency modulation amount, the pressure feedback value, the pressure definite value and the steam valve
The first upper limit value is calculated in amount processed, comprising:
The pressure feedback value is compared with the pressure definite value, obtains the second comparison result；
The pressure controller is by the difference of the current control amount of the steam valve and the frequency modulation amount compared with described second
As a result it is compared, obtains the second output quantity；
Using second output quantity, the sum of the frequency modulation amount as first upper limit value.
5. primary frequency modulation control method as described in claim 1, which is characterized in that it is described according to the frequency modulation amount, it is described negative
The load definite value of lotus value of feedback and the steam turbine, is calculated the control amount of the steam valve, comprising:
Instruction in response to user enters the second control model；
Under second control model, according to the load definite value and the frequency modulation amount and generation obtain the steam valve
Control amount.
6. primary frequency modulation control method as claimed in claim 5, which is characterized in that described to judge that the pressure feedback value is super
When excess pressure definite value, according to the current control of the frequency modulation amount, the pressure feedback value, the pressure definite value and the steam valve
Amount processed recalculates the new control amount for obtaining the steam valve, comprising:
Under second control model, the pressure feedback value is compared with the pressure definite value, second is obtained and compares
As a result；
The difference of the current control amount of the steam valve and the frequency modulation amount is compared with second comparison result, is obtained
To the second output quantity, generated to obtain the second upper limit value according to second output quantity, second upper limit value is used for the steaming
The control amount of steam valve door carries out upper limit export-restriction；
According to second upper limit value, the frequency modulation amount and generate obtain the control amount of the steam valve.
7. primary frequency modulation control method as claimed in any one of claims 1 to 6, which is characterized in that the frequency modulation amount is primary adjusts
Percentage of the revolving speed definite value and speed feedback value of the steam turbine relative to fully loaded revolving speed, the load of the steam turbine are anti-when frequency
Feedback value, load definite value are the percentage relative to the full load of the steam turbine, the pressure feedback value of the steam valve,
Pressure definite value is the percentage of the loading pressure relative to steam valve.
8. a kind of primary frequency modulation control device of steam turbine for nuclear power station characterized by comprising
Acquiring unit for obtaining frequency modulation amount when primary frequency modulation, and continuously acquires the feedback loading value and steam of steam turbine
The pressure feedback value of valve；
Control unit is connect with the acquiring unit, for according to the frequency modulation amount, the feedback loading value and the steam turbine
Load definite value, the control amount of the steam valve is calculated, so that control of the steam turbine according to the steam valve
Amount adjusts the aperture of the steam valve；Described control unit is also used to judging that the pressure feedback value is more than pressure definite value
When, according to the frequency modulation amount, the pressure feedback value, the current control amount of the pressure definite value and the steam valve, again
The new control amount of the steam valve is calculated, so that the steam turbine adjusts institute according to the new control amount of the steam valve
The aperture of steam valve is stated, to adjust the power load that the output power of the steam turbine is matched with primary frequency modulation.
9. primary frequency modulation control device as claimed in claim 8, which is characterized in that described control unit includes switching control
Device, power controller and pressure controller；
The switch controller is used to selecting the power controller, the pressure controller to enter the in response to the instruction of user
One control model or the second control model；
The power controller is used under the first control model, according to the frequency modulation amount, the feedback loading value and the vapour
The load fixed value calculation of turbine obtains the control amount of the steam valve, and the control amount of the steam valve is for adjusting the steaming
The aperture of steam valve door is to change the pressure feedback value；
The pressure controller is used under the first control model, when judging that the pressure feedback value is more than pressure definite value, according to
The frequency modulation amount, the pressure feedback value, the current control amount of the pressure definite value and the steam valve, are calculated first
Upper limit value, first upper limit value are used to carry out upper limit export-restriction to the control amount of the steam valve；
The pressure controller is also used under the second control model, when judging that the pressure feedback value is more than pressure definite value, root
According to the current control amount of steam valve described in the frequency modulation amount, the pressure feedback value, the pressure definite value, it is calculated second
Upper limit value, second upper limit value are used to carry out upper limit export-restriction to the control amount of the steam valve.
10. a kind of computer readable storage medium, which is characterized in that including program, described program can be executed by processor with
Realize such as method of any of claims 1-7.
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