CN106247815B - A kind of control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit - Google Patents
A kind of control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit Download PDFInfo
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- CN106247815B CN106247815B CN201610570356.8A CN201610570356A CN106247815B CN 106247815 B CN106247815 B CN 106247815B CN 201610570356 A CN201610570356 A CN 201610570356A CN 106247815 B CN106247815 B CN 106247815B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B11/00—Controlling arrangements with features specially adapted for condensers
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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 discloses a kind of control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit, generation and generation circuit units and water supply system feed forward control loop are instructed including Coordinated Control Systems, wherein load instruction generation and lifting load speed generation circuit includes excision AGC circuit units and condenser vacuum RB circuit units.The present invention solves the in line big machine air cooling unit of overcritical small machine with the fluctuation of economy water supply system is big, set steady is poor, there are the problems such as non-programmed halt risk; the conversion function being respectively adopted under different control loops and different operating mode realizes being servo-actuated for Coordinated Control Systems target load and lifting load speed; the reasonable of water supply system feedforward amplitude is realized using feedforward polygronal function; ensure the rapidity and accuracy of unit water supply system, ensure the safe and stable operation of unit.
Description
【Technical field】
The invention belongs to steam turbine power generation technical field, is related to a kind of supercritical thermal power unit control method, more particularly to
A kind of control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit.
【Background technology】
Required according to National Sustainable Development Strategies, China Fu Mei water-deficient areas fired power generating unit has greatly in recent years
For Direct Air-cooled Unit, this type unit feed pump small turbine cold end is often equipped with the clammy system independently of host computer system
System；With the raising of domestic equipment manufacture technical merit, feed pump small steam turbine exhaust steam is immediately discharged to big machine air cooling system
Scheme is progressively suggested and implements, and the subcritical Direct Air-cooled Unit of this type has successful operation experience, engineering experiment data
Also it is proved when the quick significantly change of unit back pressuce, the major parameter such as small steam turbine rotating speed, feedwater flow being capable of the random groups back of the body
Buckling and smooth change, no fluctuation.
For overcritical Direct Air-cooled Unit, the in line big machine steam exhaust device of feed pump turbine steam discharge still suffers from following a few sides
The problem of face：
In the case where feed pump turbine steam discharge is directly entered host steam exhaust device, effective enthalpy drop of feed pump turbine
For the enthalpy difference of steam.Under high back pressure operating mode, enthalpy drop reduces, and exhaust enthalpy significantly changes the shakiness for adding small machine variable working condition
Qualitative, strong wind or fitful wind weather especially under summer high temperature environment, economy is frequently and violent, easily causes small steam turbine and contributes
Deficiency, it is impossible to quickly meet the needs of confluent；
In the control strategy of conventional power unit, only consider back pressure as the Protection parameters of unit, without considering back pressure to coordinating
The influence of control system, and for the in line big machine air cooling unit of the especially overcritical small machine of overcritical Direct Air-Cooled, in summer height
Under warm strong wind weather, back-pressure surges are larger, and the situation of small turbine and big steam turbine " robbing vapour " can be caused to occur, cause host to bear
Lotus fluctuation is big, and adjustment is difficult, finally because back pressure is increased to protection value and chaser, but at this time by rationally setting control program,
It is not necessary to which trigger protection acts, this manufactures non-programmed halt to power plant, and power grid is caused to impact.
【The content of the invention】
It is an object of the invention to overcome above-mentioned existing technical disadvantages, there is provided a kind of small machine of supercritical thermal power unit is in line
The control method of big machine air cooling system, by the improvement to conventional coordinated control system and feed water control system, ensure that small
The regulation quality of the in line big air-cooled supercritical thermal power unit of machine of machine, it is ensured that the safe and stable operation of unit.
In order to achieve the above object, technical scheme is as follows：
A kind of control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit,
A kind of control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit, it is characterised in that including following step
Suddenly：
(1) power of the assembling unit signal and unit back pressuce signal are obtained and carries out filtering process；
(2) logic judgment is carried out according to power of the assembling unit value, unit back pressuce value and unit back pressuce rate of change, generates buster
The instruction of group AGC control modes；
(3) by the instruction of excision unit AGC control modes as Rule of judgment, to the target of former Coordinated Control Systems
Value and momentary speed variation switch over, and generate the unit load instruction after final goal load instruction and speed limit；
(4) logic judgment is carried out according to power of the assembling unit value, unit back pressuce value and unit back pressuce rate of change, generates condenser
Vacuum RB action commands；
(5) desired value of former unit RB control systems is instructed as Rule of judgment by condenser vacuum RB action commands
Switched over the target velocity rate of change, generate final unit RB target load instructions and RB the target velocity rate of change；
(6) the unit back pressuce value after filtered processing is shown that feed pump turbine control valve opening refers to through functional operation
The feed-forward signal of order；
(7) feed-forward signal for instructing feed pump turbine control valve opening adds feed pump steam turbine routine serials control and returns
Road, ultimately generates the instruction of feed pump turbine control valve opening.
Further, the power of the assembling unit signal after the filtered processing and definite value 6 are subjected to high level and judge 1 computing, work as machine
Group power signal is more than or equal to definite value 6, then high level judges 1 output for digital quantity 1, and otherwise high level judges 1 output for digital quantity 0,
Obtain the first input value of 1 algorithm of logic and operation；By the power of the assembling unit signal after filtered processing respectively through the first conversion letter
Number and the second conversion functional operation show that speed is high and judge that algorithm and high level judge the definite value input of 2 algorithms；
Unit back pressuce signal after filtered processing and the second conversion function-output are carried out high level and judge 2 computings, when
Unit back pressuce signal is more than or equal to the second conversion function-output, then high level judges 2 outputs for digital quantity 1, and otherwise high level judges 2
Export as digital quantity 0, draw the second input value of 1 algorithm of logic and operation；By the unit back pressuce signal after filtered processing with
First conversion function-output carries out speed height and judges computing, when the rate of change of unit back pressuce signal is more than or equal to the first conversion
Function-output, then speed is high judges output for digital quantity 1, and otherwise speed is high judges output for digital quantity 0, show that logical AND is transported
Calculate the 3rd input value of 1 algorithm；
The first input value, the second input value and the 3rd input value of 1 algorithm of logic and operation through 1 computing of logic and operation,
Draw the instruction of excision unit AGC control modes；
The instruction for cutting off unit AGC control modes obtains unit target load instruction with definite value 1 through switching 1 algorithm computing,
When the command signal for cutting off unit AGC control modes is digital quantity 0, the output valve for switching 1 is former unit load instruction generation
The generation value in circuit, when the command signal for cutting off unit AGC control modes is digital quantity 1, the output valve for switching 1 is definite value 1
Value；
The instruction of excision unit AGC control modes, through switching 2 algorithm computings, is controlled with definite value 2, definite value 3 when cutting off unit AGC
When the command signal of mode processed is digital quantity 0, the output valve for switching 2 is the value of definite value 2, when excision unit AGC control modes
When command signal is digital quantity 1, the output valve for switching 2 is the value of definite value 3, so that the speed limit definite value of rate-limiting algorithm is obtained,
The speed limit definite value and the computing through rate-limiting algorithm jointly of unit target load instruction, finally obtain unit load instruction.
Further, described first conversion function, the second conversion function and definite value 1, definite value 6 are determined by theoretical calculation
Method determine that definite value 2 and 3 tested method of definite value are determined；
It is bent by the blocked curve of direct air cooling system output calculation and turbine back pressure random groups load variations, alarm
Line and chaser curve, determine the first conversion letter of alarm between back pressure curve and the chaser curve of random groups load variations
Number, while draw the second conversion function according to the relative difference of the first conversion function curve and unit back pressuce chaser curve；Foundation
Steam turbine thermodynamic computing and back pressure blocked curve, alarm curve, chaser curve, the energy of back pressure is adjusted with reference to direct air cooling system
Power, finally determine the corresponding definite value 1 of Coordinated Control Systems target load instruction value and unit cut off AGC control modes into
The load constraint definite value 6 of row load down operation；
Definite value 2 is the load speed rate of change of unit routine, is determined during debugging by unit performance；Definite value 3 is generation
Rate of change during back pressure emergency action, takes as far as possible on the premise of boiler safety and Coordinated Control Systems input is ensured
Big value.
Further, the power of the assembling unit signal after the filtered processing judges 3 computings with the progress of definite value 8 high level, works as unit
Power signal is more than or equal to definite value 8, then high level judges 3 outputs for digital quantity 1, and otherwise high level judges that 3 outputs for digital quantity 0, obtain
To the first input value of 2 algorithm of logic and operation；Unit back pressuce signal after the filtered processing carries out high level with definite value 9 and sentences
Disconnected 4 computings, when power of the assembling unit signal is more than or equal to definite value 9, then high level judges 4 outputs for digital quantity 1, and otherwise high level judges that 4 is defeated
Go out for digital quantity 0, obtain the second input value of 2 algorithm of logic and operation；Triggered the operation result of logic and operation 2 as RS
The S ends input of device, triggering generation condenser vacuum RB action signals；Power of the assembling unit signal carries out low value with definite value 7 and judges computing,
When power of the assembling unit signal is less than or equal to definite value 7, then low value judges output for digital quantity 1, and otherwise low value judges output for digital quantity
0, the reset of RB action signals is realized at R end of the output through rest-set flip-flop which judges；
Condenser vacuum RB action signals are respectively by switching 3 and 4 algorithms of switching using definite value 4 and definite value 5 as RB
Target load instruction and RB targeted rate values；Wherein definite value 4 is by steam turbine thermodynamic computing combination direct air cooling system regulating power
Obtained by theoretical calculation；Experience targeted rate when definite value 5 is acted according to conventional RB is configured；According to steam turbine heating power meter
Calculate and back pressure blocked curve, alarm curve, chaser curve, the ability that back pressure is adjusted with reference to direct air cooling system integrate commenting
Sentence, show that power of the assembling unit definite value 8, unit back pressuce definite value 9 and condenser vacuum the RB action of condenser vacuum RB actions reset
Power of the assembling unit definite value 7.
Further, the unit back pressuce value after filtered processing is drawn into feed pump turbine through the 3rd conversion functional operation
The feed-forward signal of control valve opening instruction；The feed-forward signal that feed pump turbine control valve opening is instructed adds feed pump steam turbine
Conventional serials control circuit, ultimately generates the instruction of feed pump turbine control valve opening；This 3rd conversion function is definite by testing,
Contribute and change according to feed pump turbine after unit back pressuce change, feed pump steam turbine is gone out with reference to feed pump steam turbine regulating valve aperture
The influence of power, determines to can guarantee that the economy that feed pump steam turbine is contributed is bent to the feedforward of deserved feed pump steam turbine regulating valve aperture
Line, this is the 3rd conversion function
Beneficial effects of the present invention：
Supercritical unit feed pump small steam turbine exhaust steam provided by the invention is immediately discharged to big steam turbine direct air cooling system
Control method, solve the in line big machine air cooling unit of overcritical small machine to water supply system control rapidity requirement, subtract at the same time
The disturbance that weak back pressure controls water supply system；On the other hand by instructing generation and lifting load speed to coordinated control system
Generate the improvement in circuit, it is ensured that unit not chaser under summer high temperature high wind conditions, it is ensured that power plant's whole economic efficiency and power grid
Safe and stable operation.
【Brief description of the drawings】
Fig. 1 is a kind of controlling party of the in line big machine air cooling system of the small machine of supercritical thermal power unit provided in an embodiment of the present invention
The flow diagram of method；
Fig. 2 is the structure diagram that coordinated control system provided in an embodiment of the present invention instruction and speed generate circuit；
Fig. 3 is water supply system feed forward control loop structure diagram provided in an embodiment of the present invention.
【Embodiment】
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only the part of the embodiment of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained without making creative work it is all its
His embodiment, belongs to the scope of protection of the invention.
The present invention provides a kind of control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit, the controlling party
Method is applied to the instruction generation of Coordinated Control Systems adjusting load and lifting load speed generates control loop and is used for
Guarantee unit water supply system is quick, safety, the water supply system feed forward control loop of even running, as shown in Figure 1, the controlling party
Method comprises the following steps：
Obtain power of the assembling unit signal and unit back pressuce signal and carry out filtering process；
Logic judgment, generation excision unit are carried out according to power of the assembling unit value and unit back pressuce value, unit back pressuce rate of change
The instruction of AGC (Automatic Generation Control) control mode；
By the control instruction of excision AGC control modes as Rule of judgment, to the desired value of former Coordinated Control Systems
Switched over momentary speed variation, generate the unit load instruction after final goal load instruction and speed limit；
Logic judgment is carried out according to power of the assembling unit value and unit back pressuce value, unit back pressuce rate of change, generation condenser is true
Empty RB (fast cutback) action command；
By condenser vacuum RB action commands as Rule of judgment, to the desired value instruction of former unit RB control systems and mesh
Mark momentary speed variation switches over, and generates final unit RB target load instructions and RB the target velocity rate of change；
By the unit back pressuce value after filtered processing through functional operation, the instruction of feed pump turbine control valve opening is drawn
Feed-forward signal；
The feed-forward signal that feed pump turbine control valve opening is instructed adds feed pump steam turbine routine serials control circuit,
Ultimately generate the instruction of feed pump turbine control valve opening.
Present invention also offers coordinated control system instruction and the structure diagram in speed generation circuit, specifically such as Fig. 2 institutes
Show.
Coordinated Control Systems adjust the instruction generation of load and lifting load speed is generated and coordinated in control loop
The definite method of control system target load instruction and load instruction (after speed limit) is：
Obtain power of the assembling unit signal and unit back pressuce signal and filtered processing；
Power of the assembling unit signal after the filtered processing and definite value 6 are subjected to high level and judge 1, obtains logic and operation 1
First input value of algorithm；By the power of the assembling unit signal after filtered processing respectively through the first conversion function and the second conversion function
Computing show that high level judges 2 algorithms and the high definite value input for judging algorithm of speed；By the unit back pressuce signal after filtered processing
Judge 2 and the high judgement of speed through high level respectively, sentence respectively compared with the first conversion function and the second conversion function-output
It is disconnected, the second input value and the 3rd input value of 1 algorithm of logic and operation are drawn respectively；
The first input value, the second input value and the 3rd input value of 1 algorithm of logic and operation through 1 computing of logic and operation,
Draw the instruction of excision unit AGC control modes；
The instruction for cutting off unit AGC control modes obtains unit target load instruction through switching 1 algorithm computing；Cut off unit
The instruction 2 algorithm computings of switching of AGC control modes obtain the speed limit definite value of rate-limiting algorithm, which bears with unit target
Lotus instructs the computing through rate-limiting algorithm jointly, finally obtains unit load instruction (after speed limit).
It is exemplary, the first conversion function, the second conversion function and the definite value 1, definite value 2, definite value 3, definite value 6
Determine method：
Understood according to steam turbine thermodynamic computing, there are the blocked curves of random groups load variations, alarm are bent for turbine back pressure
Line and chaser curve, by the relation of direct air cooling system output calculation and three above curve, determine one at random
First conversion function of alarm between back pressure curve and the chaser curve of group load variations, while convert function curve according to first
The second conversion function is drawn with the relative difference of unit back pressuce chaser curve；It is bent according to steam turbine thermodynamic computing and back pressure obstruction
Line, alarm curve, chaser curve, the ability of back pressure is adjusted with reference to direct air cooling system, finally determines unit cooperative control system
The corresponding definite value 1 of target load instruction value of uniting and unit excision AGC control modes carry out the load constraint definite value of load down operation
6；
When and generation excision AGC larger in unit back pressuce value and economy rate is instructed, in order to ensure unit safety is quick
Load down, the switching of rate of change is realized by switching 2 algorithms, and definite value 2 is the load speed rate of change of unit routine, is generally existed
Determined during debugging by unit performance；Is rate of change during back pressure emergency action occurs for definite value 3, but this value cannot be infinitely great,
Take large values as far as possible on the premise of boiler safety and Coordinated Control Systems input is ensured.
Exemplary, the definite method of the final RB target load instructions of the unit and targeted rate is：
Obtain power of the assembling unit signal and unit back pressuce signal and filtered processing；
Power of the assembling unit signal after the filtered processing and unit back pressuce signal are carried out with definite value 8 and definite value 9 respectively
High level judge 3 and high level judge 4 computings, output it and carry out logic and operation 2 jointly with reference to unit coordinated control mode signal,
Inputted the operation result of logic and operation 2 as the S ends of rest-set flip-flop, triggering generation condenser vacuum RB action signals should
The reset signal of signal carried out after low value judges computing by power of the assembling unit signal and definite value 7, and the R ends through rest-set flip-flop are realized.
Wherein, according to steam turbine thermodynamic computing and back pressure blocked curve, alarm curve, chaser curve, with reference to direct air cooling system tune
Save back pressure ability carry out Comprehensive Evaluation, draw condenser vacuum RB action power of the assembling unit definite value 8, unit back pressuce definite value 9 with
And the power of the assembling unit definite value 7 that condenser vacuum RB actions reset.
Condenser vacuum RB action signals are respectively by switching 3 and 4 algorithms of switching using definite value 4 and definite value 5 as RB
Target load instruction and RB targeted rate values；Wherein definite value 4 can be adjusted by steam turbine thermodynamic computing combination direct air cooling system
Ability is obtained by theoretical calculation, which is a corresponding unit load value for ensuring to meet unit safety；Definite value 5 can be according to
Experience targeted rate when being acted according to conventional RB is configured；.
Further, the embodiment of the present invention additionally provides water supply system feed forward control loop structure diagram, specific such as Fig. 3
It is shown.
Exemplary, the feed water control system feed-forward signal generation, implementation and the 3rd convert determining for function：
By the unit back pressuce value after filtered processing through the 3rd conversion functional operation, show that feed pump turbine regulating valve is opened
Spend the feed-forward signal of instruction；The feed-forward signal that feed pump turbine control valve opening is instructed adds feed pump steam turbine routine tandem
Control loop, ultimately generates the instruction of feed pump turbine control valve opening；This 3rd conversion function is determined by testing, according to unit
Feed pump turbine, which is contributed, after economy changes, the shadow contributed with reference to feed pump steam turbine regulating valve aperture to feed pump steam turbine
Ring, determine to can guarantee that economy that feed pump steam turbine is contributed feedovers deserved feed pump steam turbine regulating valve aperture curve, this
As the 3rd conversion function.
Wherein, it is straight to be immediately discharged to big steam turbine for supercritical unit feed pump small steam turbine exhaust steam provided in an embodiment of the present invention
The control unit for connecing air cooling system is relatively adapted to large-scale pulverized coal firing boiler, and the DCS that production can be designed by different company is controlled
System configuration processed is realized；Convenient, the power of the assembling unit signal, unit back pressuce signal, unit cooperative control mode signal to realize
Both from the control system of thermal power generation unit.
The control method of the in line big machine air cooling system of the small machine of a kind of supercritical thermal power unit provided in an embodiment of the present invention point
The protection act under the stable operation and extreme case of unit is not considered, in unit back pressuce because air cooling system various factors changes
When, it is calculated first by converting function in feedforward amount access unit feed water control system circuit, eliminates economy disturbance
To ensure the fast response characteristic of water supply system；Meanwhile it is higher with back pressure in the power of the assembling unit, and economy speed is very fast,
Unit cannot maintain stable operation under current load condition at this time, then trigger unit excision AGC at this time, and pass through control
Unit target load instruction and raising speed rate definite value are modified by circuit, it is ensured that unit reaches safe and stable operation value, controls herein
During circuit processed is realized, the situation that logic judgment condition changes by unit operating mode is fully taken into account, herein part control loop
It is middle to use conversion function to realize to the variable element of back pressure definite value and economy rate value in unit operation condition；In addition,
When unit back pressuce is excessive, control loop of the present invention then directly triggers condenser vacuum RB action, while by suitable condenser
The target load instruction of RB actions and the speed generation signal of RB actions are added in routine RB control loops, it is ensured that unit condenser
The rapidity and accuracy of RB actions, so that it is guaranteed that the safe and stable operation of whole unit, to prevent causing unit non-programmed halt.
Embodiment of above is merely to illustrate the present invention, and not limitation of the present invention, in relation to the common of technical field
Technical staff, without departing from the spirit and scope of the present invention, can also make a variety of changes and modification, therefore all
Equivalent technical solution falls within scope of the invention, and scope of patent protection of the invention should be defined by the claims.
Claims (5)
1. a kind of control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit, it is characterised in that including following step
Suddenly：
(1) power of the assembling unit signal and unit back pressuce signal are obtained and carries out filtering process；
(2) logic judgment, generation excision unit are carried out according to power of the assembling unit value, unit back pressuce value and unit back pressuce rate of change
The instruction of AGC control modes；
(3) by the instruction of excision unit AGC control modes as Rule of judgment, desired value to former Coordinated Control Systems and
Momentary speed variation switches over, and generates the unit load instruction after final goal load instruction and speed limit；
(4) logic judgment is carried out according to power of the assembling unit value, unit back pressuce value and unit back pressuce rate of change, generates condenser vacuum
RB action commands；
(5) by condenser vacuum RB action commands as Rule of judgment, to the desired value instruction of former unit RB control systems and mesh
Mark momentary speed variation switches over, and generates final unit RB target load instructions and RB the target velocity rate of change；
(6) the unit back pressuce value after filtered processing is drawn into the instruction of feed pump turbine control valve opening through functional operation
Feed-forward signal；
(7) feed-forward signal for instructing feed pump turbine control valve opening adds feed pump steam turbine routine serials control circuit,
Ultimately generate the instruction of feed pump turbine control valve opening.
2. the control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit according to claim 1, its feature
It is：Power of the assembling unit signal after the filtered processing and definite value 6 are subjected to high level and judge 1 computing, when power of the assembling unit signal
More than or equal to definite value 6, then high level judges 1 output for digital quantity 1, and otherwise high level judges that 1 exports as digital quantity 0, obtains logical AND
First input value of 1 algorithm of computing；By the power of the assembling unit signal after filtered processing respectively through the first conversion function and the second folding
Calculate the definite value input that functional operation show that speed height judges algorithm and high level judges 2 algorithms；
Unit back pressuce signal after filtered processing and the second conversion function-output are carried out high level and judge 2 computings, works as unit
Back pressure signal is more than or equal to the second conversion function-output, then high level judges 2 outputs for digital quantity 1, and otherwise high level judges 2 outputs
For digital quantity 0, the second input value of 1 algorithm of logic and operation is drawn；By the unit back pressuce signal and first after filtered processing
Conversion function-output carries out speed height and judges computing, when the rate of change of unit back pressuce signal is more than or equal to the first conversion function
Output valve, then speed is high judges output for digital quantity 1, and otherwise speed is high judges that output for digital quantity 0, draws logic and operation 1
3rd input value of algorithm；
The first input value, the second input value and the 3rd input value of 1 algorithm of logic and operation are drawn through 1 computing of logic and operation
Cut off the instruction of unit AGC control modes；
Instruction and the definite value 1 for cutting off unit AGC control modes obtain unit target load instruction through switching 1 algorithm computing, when cutting
When except the command signal of unit AGC control modes being digital quantity 0, the output valve for switching 1 is former unit load instruction generation circuit
Generation value, when the command signal for cutting off unit AGC control modes be digital quantity 1, switch the value of 1 output valve for definite value 1；
The instruction of excision unit AGC control modes and definite value 2, definite value 3 are through switching 2 algorithm computings, when excision unit AGC controlling parties
When the command signal of formula is digital quantity 0, the output valve for switching 2 is the value of definite value 2, when the instruction of excision unit AGC control modes
When signal is digital quantity 1, the output valve for switching 2 is the value of definite value 3, so as to obtain the speed limit definite value of rate-limiting algorithm, the limit
Fast definite value and the computing through rate-limiting algorithm jointly of unit target load instruction, finally obtain unit load instruction.
3. the control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit according to claim 2, its feature
It is：
Described first converts function, the second conversion function and definite value 1, the definite of definite value 6 is determined by the method for theoretical calculation,
Definite value 2 and 3 tested method of definite value are determined；
By the blocked curve of direct air cooling system output calculation and turbine back pressure random groups load variations, alarm curve with
And chaser curve, that determines random groups load variations converts function between the first of back pressure alarm curve and chaser curve, together
When the relative difference of function curve and unit back pressuce chaser curve converted according to first draw the second conversion function；According to steam turbine
Thermodynamic computing and back pressure blocked curve, alarm curve, chaser curve, the ability of back pressure are adjusted with reference to direct air cooling system, most
Determine that the corresponding definite value 1 of Coordinated Control Systems target load instruction value and unit excision AGC control modes are dropped eventually
The load constraint definite value 6 of load operation；
Definite value 2 is the load speed rate of change of unit routine, is determined during debugging by unit performance；Definite value 3 is generation back pressure
Rate of change during emergency action, takes big as far as possible on the premise of boiler safety and Coordinated Control Systems input is ensured
Value.
4. the control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit according to claim 1, its feature
It is：
Power of the assembling unit signal after the filtered processing carries out high level with definite value 8 and judges 3 computings, when power of the assembling unit signal is more than
Equal to definite value 8, then high level judges 3 outputs for digital quantity 1, and otherwise high level judges that 3 export as digital quantity 0, obtains logic and operation 2
First input value of algorithm；Unit back pressuce signal after the filtered processing carries out high level with definite value 9 and judges 4 computings, works as machine
Group power signal is more than or equal to definite value 9, then high level judges 4 outputs for digital quantity 1, and otherwise high level judges 4 outputs for digital quantity 0,
Obtain the second input value of 2 algorithm of logic and operation；Inputted the operation result of logic and operation 2 as the S ends of rest-set flip-flop,
Triggering generation condenser vacuum RB action signals；Power of the assembling unit signal carries out low value with definite value 7 and judges computing, when the power of the assembling unit is believed
Number it is less than or equal to definite value 7, then low value judges output for digital quantity 1, and otherwise low value judges to export for digital quantity 0, low value judgement
R end of the output through rest-set flip-flop realize the reset of RB action signals；
Condenser vacuum RB action signals are respectively by switching 3 and 4 algorithms of switching using definite value 4 and definite value 5 as RB targets
Load instruction and RB targeted rate values；Wherein definite value 4 is passed through by steam turbine thermodynamic computing combination direct air cooling system regulating power
Theoretical calculation obtains；Experience targeted rate when definite value 5 is acted according to conventional RB is configured；According to steam turbine thermodynamic computing with
And back pressure blocked curve, alarm curve, chaser curve, the ability that back pressure is adjusted with reference to direct air cooling system carry out Comprehensive Evaluation,
Draw the machine that power of the assembling unit definite value 8, unit back pressuce definite value 9 and condenser vacuum the RB action of condenser vacuum RB actions reset
Group power definite value 7.
5. the control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit according to claim 1, its feature
It is：
By the unit back pressuce value after filtered processing through the 3rd conversion functional operation, show that feed pump turbine control valve opening refers to
The feed-forward signal of order；The feed-forward signal that feed pump turbine control valve opening is instructed adds feed pump steam turbine routine serials control
Circuit, ultimately generates the instruction of feed pump turbine control valve opening；This 3rd conversion function is determined by testing, according to unit back pressuce
Feed pump turbine, which is contributed, after change changes, the influence contributed with reference to feed pump steam turbine regulating valve aperture to feed pump steam turbine, really
Make and can guarantee that economy that feed pump steam turbine is contributed feedovers deserved feed pump steam turbine regulating valve aperture curve, this is the
Three conversion functions.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610570356.8A CN106247815B (en) | 2016-07-19 | 2016-07-19 | A kind of control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit |
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| CN201610570356.8A CN106247815B (en) | 2016-07-19 | 2016-07-19 | A kind of control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit |
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| CN109780884B (en) * | 2018-12-29 | 2020-10-02 | 中国神华能源股份有限公司 | Set backpressure model establishing method, control method and system and set |
| CN114687822A (en) * | 2020-12-25 | 2022-07-01 | 上海电气电站设备有限公司 | Control system and control method of steam turbine |
| CN113914944A (en) * | 2021-10-15 | 2022-01-11 | 西安热工研究院有限公司 | RB control method for direct air cooling system of full-load subcritical unit |
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