CN106247815A - A kind of control method of the in line big machine air cooling system of the little machine of supercritical thermal power unit - Google Patents
A kind of control method of the in line big machine air cooling system of the little machine of supercritical thermal power unit Download PDFInfo
- Publication number
- CN106247815A CN106247815A CN201610570356.8A CN201610570356A CN106247815A CN 106247815 A CN106247815 A CN 106247815A CN 201610570356 A CN201610570356 A CN 201610570356A CN 106247815 A CN106247815 A CN 106247815A
- Authority
- CN
- China
- Prior art keywords
- unit
- value
- definite value
- signal
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The present invention discloses the control method of the in line big machine air cooling system of the little machine of a kind of supercritical thermal power unit, generating and generate circuit units and water supply system feed forward control loop including Coordinated Control Systems instruction, wherein load instruction generates and lifting load speed generates loop and comprises excision AGC circuit units and condenser vacuum RB circuit units.The present invention solves that the in line big machine Air-cooled Unit of the little machine of supercritical is big with the fluctuation of economy water supply system, set steady is poor, there is the problems such as non-programmed halt risk; it is respectively adopted the different conversion function controlled under loop and different operating mode and realizes the servo-actuated of Coordinated Control Systems target load and lifting load speed; feedforward polygronal function is used to realize the reasonable of water supply system feedforward amplitude; guarantee rapidity and the accuracy of unit water supply system, it is ensured that the safe and stable operation of unit.
Description
[technical field]
The invention belongs to steam turbine power generation technical field, relate to a kind of supercritical thermal power unit control method, particularly relate to
A kind of control method of the in line big machine air cooling system of the little machine of supercritical thermal power unit.
[background technology]
According to National Sustainable Development Strategies requirement, China's richness coal water-deficient area fired power generating unit has greatly in recent years
For Direct Air-cooled Unit, this type unit cold end of feed pump small turbine is often equipped with the clammy system independent of host computer system
System；Along 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, the existing successful operation experience of the subcritical Direct Air-cooled Unit of this type, engineering experiment data
Also being proved when unit back pressuce the most significantly changes, the major parameter such as little steam turbine rotating speed, feedwater flow all can the random group back of the body
Buckling and smooth change, without fluctuation.
For supercritical Direct Air-cooled Unit, the in line big machine steam exhaust device of feed pump turbine steam discharge still suffers from following a few side
The problem in face:
In the case of feed pump turbine steam discharge is directly entered main frame steam exhaust device, effective enthalpy drop of feed pump turbine
Enthalpy difference for steam.Under high back pressure operating mode, enthalpy drop reduces, and the significantly variation of exhaust enthalpy adds the shakiness of little machine variable working condition
Qualitative, the especially strong wind under summer high temperature environment or fitful wind weather, economy is frequent and violent, easily causes little steam turbine and exerts oneself
Not enough, it is impossible to quickly to meet the demand of confluent；
In the control strategy of conventional power unit, only back pressure is considered as the Protection parameters of unit, do not consider that back pressure is to coordination
The impact of control system, and big machine Air-cooled Unit in line for the supercritical Direct Air-Cooled little machine of especially supercritical, high in summer
Under temperature strong wind weather, back-pressure surges is relatively big, and the situation that small turbine and big steam turbine can be caused " to rob vapour " occurs, causes main frame to bear
Lotus fluctuation is big, adjusts difficulty, finally the chaser because back pressure is increased to protection value, but now by rationally arranging control program,
There is no need trigger protection action, this manufactures non-programmed halt to power plant, impacts electrical network.
[summary of the invention]
It is an object of the invention to overcome above-mentioned existing technical disadvantages, it is provided that a kind of little machine of supercritical thermal power unit is in line
The control method of big machine air cooling system, by conventional coordinated control system and the improvement of feed water control system, it is ensured that little
The regulation quality of the in line big machine air cooling supercritical thermal power unit 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 little machine of supercritical thermal power unit,
The control method of the in line big machine air cooling system of the little machine of a kind of supercritical thermal power unit, it is characterised in that include following step
Rapid:
(1) obtain power of the assembling unit signal and unit back pressuce signal and carry out Filtering Processing；
(2) carry out logical judgment according to power of the assembling unit value, unit back pressuce value and unit back pressuce rate of change, generate buster
The instruction of group AGC control mode；
(3) by the instruction of excision unit AGC control mode as Rule of judgment, the target to 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) carry out logical judgment according to power of the assembling unit value, unit back pressuce value and unit back pressuce rate of change, generate condenser
Vacuum RB action command；
(5) by condenser vacuum RB action command as Rule of judgment, the desired value of former unit RB control system is instructed
Switch over the target velocity rate of change, generate final unit RB target load instruction and the RB target velocity rate of change；
(6) by the unit back pressuce value after filtered process through functional operation, show that feed pump turbine control valve opening refers to
The feed-forward signal of order；
(7) feed-forward signal that feed pump turbine control valve opening instructs is added feed pump steam turbine routine serials control to return
Road, ultimately generates the instruction of feed pump turbine control valve opening.
Further, the power of the assembling unit signal after described filtered process and definite value 6 are carried out high level and judges 1 computing, work as machine
Group power signal is more than or equal to definite value 6, then high level judges that 1 is output as digital quantity 1, and otherwise high level judges that 1 is output as digital quantity 0,
Obtain the first input value of logic and operation 1 algorithm；Power of the assembling unit signal after filtered process is converted letter through first respectively
Number and the second conversion functional operation show that speed high evaluation algorithm and high level judge the definite value input of 2 algorithms；
Unit back pressuce signal after filtered process 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 that 2 are output as digital quantity 1, and otherwise high level judges 2
It is output as digital quantity 0, draws the second input value of logic and operation 1 algorithm；By the unit back pressuce signal after filtered process 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 height judges to be output as digital quantity 1, and otherwise speed height judges to be output as digital quantity 0, show that logical AND is transported
Calculate the 3rd input value of 1 algorithm；
First input value of logic and operation 1 algorithm, the second input value and the 3rd input value through logic and operation 1 computing,
Draw the instruction of excision unit AGC control mode；
The instruction of excision unit AGC control mode obtains unit target load instruction with definite value 1 through switching 1 algorithm computing,
When the command signal excising unit AGC control mode is digital quantity 0, the output valve of switching 1 is that the instruction of former unit load generates
The generation value in loop, when the command signal excising unit AGC control mode is digital quantity 1, the output valve of switching 1 is definite value 1
Value；
The instruction of excision unit AGC control mode, is controlled when excising unit AGC through switching 2 algorithm computings with definite value 2, definite value 3
When the command signal of mode processed is digital quantity 0, the value that output valve is definite value 2 of switching 2, when excision unit AGC control mode
When command signal is digital quantity 1, the value that output valve is definite value 3 of switching 2, thus obtain the speed limit definite value of rate-limiting algorithm,
This speed limit definite value and unit target load instruction, jointly through the computing of rate-limiting algorithm, finally give unit load instruction.
Further, described first conversion function, the second conversion function and definite value 1, definite value 6 determination by Theoretical Calculation
Method determine, definite value 2 and the tested method of definite value 3 are determined；
By direct air cooling system output calculation and the blocked curve of turbine back pressure random group load variations, song of reporting to the police
Line and chaser curve, that determines random group load variations converts letter between the first of back pressure warning curve and chaser curve
Number, draws the second conversion function according to the relative difference of the first conversion function curve with unit back pressuce chaser curve simultaneously；Foundation
Steam turbine thermodynamic computing and back pressure blocked curve, warning curve, chaser curve, in conjunction with the energy of direct air cooling system regulation back pressure
Power, finally determines that definite value 1 corresponding to Coordinated Control Systems target load instruction value and unit excision AGC control mode are entered
The load constraint definite value 6 that row load down runs；
Definite value 2 is the load speed rate of change that unit is conventional, is determined by unit performance during debugging；Definite value 3 is for occurring
Rate of change during back pressure emergency action, takes on the premise of guaranteeing boiler safety and Coordinated Control Systems input as far as possible
Big value.
Further, the power of the assembling unit signal after described filtered process and definite value 8 carry out high level and judge 3 computings, work as unit
Power signal is more than or equal to definite value 8, then high level judges that 3 are output as digital quantity 1, and otherwise high level judges that 3 are output as digital quantity 0,
The first input value to logic and operation 2 algorithm；Unit back pressuce signal after described filtered process 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 that 4 are output as digital quantity 1, and otherwise high level judges that 4 is defeated
Go out for digital quantity 0, obtain the second input value of logic and operation 2 algorithm；The operation result of logic and operation 2 is triggered as RS
The S end input of device, triggers and generates condenser vacuum RB actuating signal；Power of the assembling unit signal and definite value 7 carry out low value and judge computing,
When power of the assembling unit signal is less than or equal to definite value 7, then low value judges to be output as digital quantity 1, and otherwise low value judges to be output as digital quantity
0, the output that this low value judges realizes the reset of RB actuating signal through the R end of rest-set flip-flop；
Condenser vacuum RB actuating signal respectively through switching 3 and switching 4 algorithms using definite value 4 and definite value 5 as RB
Target load instruction and RB targeted rate value；Wherein definite value 4 is combined direct air cooling system regulating power by steam turbine thermodynamic computing
Obtained by Theoretical Calculation；Definite value 5 is configured according to experience targeted rate during conventional RB action；According to steam turbine heating power meter
Calculating and back pressure blocked curve, warning curve, chaser curve, the ability in conjunction with direct air cooling system regulation back pressure is comprehensively commented
Sentence, show that the power of the assembling unit definite value 8 of condenser vacuum RB action, unit back pressuce definite value 9 and condenser vacuum RB action reset
Power of the assembling unit definite value 7.
Further, the unit back pressuce value after filtered process is converted functional operation through the 3rd, draws feed pump turbine
The feed-forward signal of control valve opening instruction；The feed-forward signal instructed by feed pump turbine control valve opening adds feed pump steam turbine
Conventional serials control loop, ultimately generates the instruction of feed pump turbine control valve opening；This 3rd conversion function is determined by test,
After changing according to unit back pressuce, feed pump turbine is exerted oneself change, goes out feed pump steam turbine in conjunction with feed pump steam turbine regulating valve aperture
The impact of power, determines and can guarantee that the economy that feed pump steam turbine is exerted oneself 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:
The supercritical unit feed pump small steam turbine exhaust steam that the present invention provides is immediately discharged to big steam turbine direct air cooling system
Control method, solve the in line big machine Air-cooled Unit of the little machine of supercritical to water supply system control rapidity requirement, subtract simultaneously
The disturbance that water supply system is controlled by weak back pressure；On the other hand by coordinated control system instruction is generated and lifting load speed
Generate the improvement in loop, 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 electrical network
Safe and stable operation.
[accompanying drawing explanation]
The controlling party of the in line big machine air cooling system of the little machine of a kind of supercritical thermal power unit that Fig. 1 provides for the embodiment of the present invention
The schematic flow sheet of method；
Fig. 2 instructs for the coordinated control system that the embodiment of the present invention provides and the structural representation in speed generation loop；
The water supply system feed forward control loop structural representation that Fig. 3 provides for the embodiment of the present invention.
[detailed description of the invention]
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under not making creative work premise all its
His embodiment, broadly falls into the scope of protection of the invention.
The present invention provides the control method of the in line big machine air cooling system of the little machine of a kind of supercritical thermal power unit, described controlling party
Method is applied to the Coordinated Control Systems regulation instruction generation of load and lifting load speed generate control loop and for
Guarantee unit water supply system is quick, safety, the water supply system feed forward control loop of even running, as it is shown in figure 1, described controlling party
Method comprises the following steps:
Obtain power of the assembling unit signal and unit back pressuce signal and carry out Filtering Processing；
Carry out logical judgment according to power of the assembling unit value and unit back pressuce value, unit back pressuce rate of change, generate excision unit
The instruction of AGC (Automatic Generation Control) control mode；
By the control instruction of excision AGC control mode as Rule of judgment, the desired value to former Coordinated Control Systems
Switch over momentary speed variation, generate the unit load instruction after final goal load instruction and speed limit；
Carry out logical judgment according to power of the assembling unit value and unit back pressuce value, unit back pressuce rate of change, generate condenser true
Empty RB (fast cutback) action command；
By condenser vacuum RB action command as Rule of judgment, the desired value of former unit RB control system is instructed and mesh
Mark momentary speed variation switches over, and generates final unit RB target load instruction and the RB target velocity rate of change；
By the unit back pressuce value after filtered process through functional operation, draw what feed pump turbine control valve opening instructed
Feed-forward signal；
The feed-forward signal instructed by feed pump turbine control valve opening adds feed pump steam turbine routine serials control loop,
Ultimately generate the instruction of feed pump turbine control valve opening.
Present invention also offers coordinated control system instruction and the structural representation in speed generation loop, concrete such as Fig. 2 institute
Show.
The instruction generation of Coordinated Control Systems regulation load and lifting load speed generate and control to coordinate in loop
The determination 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 process after filtering；
Power of the assembling unit signal after described filtered process and definite value 6 are carried out high level and judges 1, obtain logic and operation 1
First input value of algorithm；By the power of the assembling unit signal after filtered process respectively through the first conversion function and the second conversion function
Computing show that high level judges the definite value input of 2 algorithms and speed high evaluation algorithm；By the unit back pressuce signal after filtered process
Judge 2 and the judgement of speed height, to compare sentence with the first conversion function and the second conversion function-output respectively through high level respectively
Disconnected, draw the second input value and the 3rd input value of logic and operation 1 algorithm respectively；
First input value of logic and operation 1 algorithm, the second input value and the 3rd input value through logic and operation 1 computing,
Draw the instruction of excision unit AGC control mode；
The instruction of excision unit AGC control mode obtains unit target load instruction through switching 1 algorithm computing；Excision unit
The instruction switching 2 algorithm computings of AGC control mode obtain the speed limit definite value of rate-limiting algorithm, and this speed limit definite value is born with unit target
Lotus instruction, jointly through the computing of rate-limiting algorithm, finally gives unit load instruction (after speed limit).
Exemplary, described the first conversion function, the second conversion function and definite value 1, definite value 2, definite value 3, definite value 6
Determine method:
Understanding according to steam turbine thermodynamic computing, there is the blocked curve of random group load variations, song of reporting to the police in turbine back pressure
Line and chaser curve, by direct air cooling system output calculation and the relation of three above curve, determine one at random
That organizes load variations converts function between the first of back pressure warning curve and chaser curve, simultaneously according to the first conversion function curve
The second conversion function is drawn with the relative difference of unit back pressuce chaser curve；Song is blocked according to steam turbine thermodynamic computing and back pressure
Line, warning curve, chaser curve, in conjunction with the ability of direct air cooling system regulation back pressure, finally determine that unit cooperative controls system
Definite value 1 and unit that system target load instruction value is corresponding excise AGC control mode and carry out the load constraint definite value of load down operation
6；
When unit back pressuce value and economy rate occur relatively greatly to excise AGC instruction, quick in order to ensure unit safety
Load down, realizes the switching of rate of change by switching 2 algorithms, and definite value 2 is the load speed rate of change that unit is conventional, typically exists
Determined by unit performance during debugging；Rate of change when definite value 3 is that back pressure emergency action occurs, but this value can not be infinitely great,
Take large values as far as possible on the premise of guaranteeing boiler safety and Coordinated Control Systems input.
Exemplary, the determination method of described unit final RB target load instruction and targeted rate is:
Obtain power of the assembling unit signal and unit back pressuce signal and process after filtering；
Power of the assembling unit signal after described filtered process 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 combine unit cooperative control mode signal and jointly carry out logic and operation 2,
The operation result of logic and operation 2 is inputted as the S end of rest-set flip-flop, triggers and generate condenser vacuum RB actuating signal, should
The reset signal of signal is carried out after low value judges computing by power of the assembling unit signal and definite value 7, realizes through the R end of rest-set flip-flop.
Wherein, according to steam turbine thermodynamic computing and back pressure blocked curve, warning curve, chaser curve, in conjunction with direct air cooled system tracking
Joint back pressure ability carry out Comprehensive Evaluation, draw the power of the assembling unit definite value 8 of condenser vacuum RB action, unit back pressuce definite value 9 with
And the power of the assembling unit definite value 7 that condenser vacuum RB action resets.
Condenser vacuum RB actuating signal respectively through switching 3 and switching 4 algorithms using definite value 4 and definite value 5 as RB
Target load instruction and RB targeted rate value；Wherein definite value 4 can be combined direct air cooling system regulation by steam turbine thermodynamic computing
Ability is obtained by Theoretical Calculation, and this value is a corresponding unit load value guaranteeing to meet unit safety；Definite value 5 can depend on
It is configured according to experience targeted rate during conventional RB action；.
Further, the embodiment of the present invention additionally provides water supply system feed forward control loop structural representation, concrete such as Fig. 3
Shown in.
Exemplary, the generation of described feed water control system feed-forward signal, implementation and the determination of the 3rd conversion function:
Unit back pressuce value after filtered process is converted functional operation through the 3rd, show that feed pump turbine regulation valve is opened
The feed-forward signal of degree instruction；The feed-forward signal instructed by feed pump turbine control valve opening adds feed pump steam turbine routine tandem
Control loop, ultimately generate the instruction of feed pump turbine control valve opening；This 3rd conversion function is determined by test, according to unit
After economy, feed pump turbine is exerted oneself change, the shadow exerted oneself feed pump steam turbine in conjunction with feed pump steam turbine regulating valve aperture
Ring, determine and can guarantee that deserved feed pump steam turbine regulating valve aperture is feedovered curve by the economy that feed pump steam turbine exerts oneself, this
It is the 3rd conversion function.
Wherein, it is straight that the supercritical unit feed pump small steam turbine exhaust steam that the embodiment of the present invention provides is immediately discharged to big steam turbine
The control unit connecing air cooling system is relatively suitable for large-scale pulverized coal firing boiler, and can be controlled by the DCS that different company's design produces
System configuration processed realizes；Convenient for realizing, described power of the assembling unit signal, unit back pressuce signal, unit cooperative control mode signal
Control system both from thermal power generation unit.
The control method of the in line big machine air cooling system of the little machine of a kind of supercritical thermal power unit that the embodiment of the present invention provides is divided
Do not consider the protection act under the stable operation of unit and extreme case, change because of air cooling system various factors at unit back pressuce
Time, first pass through conversion function and calculate in feedforward amount access unit feed water control system loop, eliminate economy disturbance
To guarantee the fast response characteristic of water supply system；Meanwhile, the highest with back pressure in the power of the assembling unit, and economy speed is very fast,
Now unit can not maintain stable operation under current load condition, the most then trigger unit excision AGC, and by controlling
Unit target load instruction and raising speed rate definite value are modified by loop, it is ensured that unit reaches safe and stable operation value, control at this
During loop processed realizes, fully take into account logical judgment condition because of the situation of unit working conditions change, control loop in this part
Middle employing converts function to realize back pressure definite value in unit operation condition and the variable element of economy rate value；It addition,
When unit back pressuce is too high, condenser vacuum RB action is the most directly triggered in control loop of the present invention, simultaneously by applicable condenser
The target load instruction of RB action and the speed of RB action generate signal and add in conventional RB control loop, it is ensured that unit condenser
The rapidity of RB action and accuracy, so that it is guaranteed that the safe and stable operation of whole unit, in case causing unit non-programmed halt.
Embodiment of above is merely to illustrate the present invention, and not limitation of the present invention, common about technical field
Technical staff, without departing from the spirit and scope of the present invention, it is also possible to make a variety of changes and modification, therefore own
The technical scheme of equivalent falls within scope of the invention, and the scope of patent protection of the present invention should be defined by the claims.
Claims (5)
1. the control method of the in line big machine air cooling system of the little machine of supercritical thermal power unit, it is characterised in that include following step
Rapid:
(1) obtain power of the assembling unit signal and unit back pressuce signal and carry out Filtering Processing；
(2) carry out logical judgment according to power of the assembling unit value, unit back pressuce value and unit back pressuce rate of change, generate excision unit
The instruction of AGC control mode；
(3) by the instruction of excision unit AGC control mode as Rule of judgment, to the desired value of 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) carry out logical judgment according to power of the assembling unit value, unit back pressuce value and unit back pressuce rate of change, generate condenser vacuum
RB action command；
(5) by condenser vacuum RB action command as Rule of judgment, the desired value of former unit RB control system is instructed and mesh
Mark momentary speed variation switches over, and generates final unit RB target load instruction and the RB target velocity rate of change；
(6) by the unit back pressuce value after filtered process through functional operation, draw what feed pump turbine control valve opening instructed
Feed-forward signal；
(7) feed-forward signal that feed pump turbine control valve opening instructs is added feed pump steam turbine routine serials control loop,
Ultimately generate the instruction of feed pump turbine control valve opening.
The control method of the in line big machine air cooling system of the little machine of supercritical thermal power unit the most according to claim 1, its feature
It is: the power of the assembling unit signal after described filtered process and definite value 6 are carried out high level and judges 1 computing, when power of the assembling unit signal
More than or equal to definite value 6, then high level judges that 1 is output as digital quantity 1, and otherwise high level judges that 1 is output as digital quantity 0, obtains logical AND
First input value of computing 1 algorithm；By the power of the assembling unit signal after filtered process respectively through the first conversion function and the second folding
Calculate functional operation and show that speed high evaluation algorithm and high level judge the definite value input of 2 algorithms；
Unit back pressuce signal after filtered process 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 that 2 are output as digital quantity 1, and otherwise high level judges that 2 export
For digital quantity 0, draw the second input value of logic and operation 1 algorithm；By the unit back pressuce signal and first after filtered process
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 height judges to be output as digital quantity 1, and otherwise speed height judges to be output as digital quantity 0, draws logic and operation 1
3rd input value of algorithm；
First input value of logic and operation 1 algorithm, the second input value and the 3rd input value, through logic and operation 1 computing, draw
The instruction of excision unit AGC control mode；
The instruction of excision unit AGC control mode obtains unit target load instruction, when cutting with definite value 1 through switching 1 algorithm computing
When being digital quantity 0 except the command signal of unit AGC control mode, the output valve of switching 1 is that the instruction of former unit load generates loop
Generation value, when excise unit AGC control mode command signal be digital quantity 1 time, switching 1 the value that output valve is definite value 1；
The instruction of excision unit AGC control mode and definite value 2, definite value 3 are through switching 2 algorithm computings, when excision unit AGC controlling party
When the command signal of formula is digital quantity 0, the value that output valve is definite value 2 of switching 2, when the instruction of excision unit AGC control mode
When signal is digital quantity 1, the value that output valve is definite value 3 of switching 2, thus obtain the speed limit definite value of rate-limiting algorithm, this limit
Speed definite value jointly through the computing of rate-limiting algorithm, finally gives unit load instruction with unit target load instruction.
The control method of the in line big machine air cooling system of the little machine of supercritical thermal power unit the most according to claim 1, its feature
It is:
The determination of described the first conversion function, the second conversion function and definite value 1, definite value 6 is determined by the method for Theoretical Calculation,
Definite value 2 and the tested method of definite value 3 are determined；
By direct air cooling system output calculation and the blocked curve of turbine back pressure random group load variations, warning curve with
And chaser curve, that determines random group load variations converts function between the first of back pressure warning curve and chaser curve, with
Time draw the second conversion function according to the relative difference of the first conversion function curve and unit back pressuce chaser curve；According to steam turbine
Thermodynamic computing and back pressure blocked curve, warning curve, chaser curve, in conjunction with the ability of direct air cooling system regulation back pressure,
Determine that definite value 1 corresponding to Coordinated Control Systems target load instruction value and unit excision AGC control mode drop eventually
The load constraint definite value 6 of load operation；
Definite value 2 is the load speed rate of change that unit is conventional, is determined by unit performance during debugging；For there is back pressure in definite value 3
Rate of change during emergency action, takes big on the premise of guaranteeing boiler safety and Coordinated Control Systems input as far as possible
Value.
The control method of the in line big machine air cooling system of the little machine of supercritical thermal power unit the most according to claim 1, its feature
It is:
Power of the assembling unit signal after described filtered process and definite value 8 carry out high level and judge 3 computings, when power of the assembling unit signal is more than
Equal to definite value 8, then high level judges that 3 are output as digital quantity 1, and otherwise high level judges that 3 are output as digital quantity 0, obtains logic and operation 2
First input value of algorithm；Unit back pressuce signal after described filtered process and definite value 9 carry out high level and judge 4 computings, work as machine
Group power signal is more than or equal to definite value 9, then high level judges that 4 are output as digital quantity 1, and otherwise high level judges that 4 are output as digital quantity 0,
Obtain the second input value of logic and operation 2 algorithm；The operation result of logic and operation 2 is inputted as the S end of rest-set flip-flop,
Trigger and generate condenser vacuum RB actuating signal；Power of the assembling unit signal and definite value 7 carry out low value and judge computing, when the power of the assembling unit is believed
Number less than or equal to definite value 7, then low value judges to be output as digital quantity 1, and otherwise low value judges to be output as digital quantity 0, and this low value judges
Output realize the reset of RB actuating signal through the R end of rest-set flip-flop；
Condenser vacuum RB actuating signal respectively through switching 3 and switching 4 algorithms using definite value 4 and definite value 5 as RB target
Load instruction and RB targeted rate value；Wherein definite value 4 is combined direct air cooling system regulating power by steam turbine thermodynamic computing and passes through
Theoretical Calculation obtains；Definite value 5 is configured according to experience targeted rate during conventional RB action；According to steam turbine thermodynamic computing with
And back pressure blocked curve, warning curve, chaser curve, the ability in conjunction with direct air cooling system regulation back pressure carries out Comprehensive Evaluation,
Draw the machine that the power of the assembling unit definite value 8 of condenser vacuum RB action, unit back pressuce definite value 9 and condenser vacuum RB action reset
Group power definite value 7.
The control method of the in line big machine air cooling system of the little machine of supercritical thermal power unit the most according to claim 1, its feature
It is:
Unit back pressuce value after filtered process is converted functional operation through the 3rd, show that feed pump turbine control valve opening refers to
The feed-forward signal of order；The feed-forward signal instructed by feed pump turbine control valve opening adds feed pump steam turbine routine serials control
Loop, ultimately generates the instruction of feed pump turbine control valve opening；This 3rd conversion function is determined by test, according to unit back pressuce
After change, feed pump turbine is exerted oneself change, the impact exerted oneself feed pump steam turbine in conjunction with feed pump steam turbine regulating valve aperture, really
Making and can guarantee that deserved feed pump steam turbine regulating valve aperture is feedovered curve by the economy that feed pump steam turbine exerts oneself, this is the
Three conversion functions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106247815A true CN106247815A (en) | 2016-12-21 |
| CN106247815B CN106247815B (en) | 2018-04-20 |
Family
ID=57613474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610570356.8A Active 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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106247815B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109780884A (en) * | 2018-12-29 | 2019-05-21 | 中国神华能源股份有限公司 | Method for building up, control method, system and the unit of unit back pressuce model |
| 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 |
| 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 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008034061A1 (en) * | 2008-07-22 | 2010-01-28 | Aaslepp, Helmut | Air-cooled surface condensation system for use in steam power plant, has mixing condenser, where cooled condensate is sprayed into turbine exhaust stream flow of condenser and measurements and values of condensate differ from sample values |
| CN102072674A (en) * | 2011-01-30 | 2011-05-25 | 北京龙源冷却技术有限公司 | Indirect air-cooling control system of surface condenser |
| CN102418918A (en) * | 2011-11-15 | 2012-04-18 | 山东中实易通集团有限公司 | Method for eliminating influence of backpressure change of air-cooled unit on automatic gain control (AGC) regulation quality |
| CN102707620A (en) * | 2012-06-05 | 2012-10-03 | 江西省电力科学研究院 | Backpressure control system of large air-cooler unit |
| CN105571343A (en) * | 2014-10-31 | 2016-05-11 | 王砧 | Operation back pressure continuous optimized control method and system for air-cooled generator unit steam turbine |
| CN105674760A (en) * | 2016-03-22 | 2016-06-15 | 西安热工研究院有限公司 | Joint air-cooling system and control method |
| CN205352114U (en) * | 2015-12-09 | 2016-06-29 | 乔治洛德方法研究和开发液化空气有限公司 | Air cooling condenser unit that operation is optimized |
-
2016
- 2016-07-19 CN CN201610570356.8A patent/CN106247815B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008034061A1 (en) * | 2008-07-22 | 2010-01-28 | Aaslepp, Helmut | Air-cooled surface condensation system for use in steam power plant, has mixing condenser, where cooled condensate is sprayed into turbine exhaust stream flow of condenser and measurements and values of condensate differ from sample values |
| CN102072674A (en) * | 2011-01-30 | 2011-05-25 | 北京龙源冷却技术有限公司 | Indirect air-cooling control system of surface condenser |
| CN102418918A (en) * | 2011-11-15 | 2012-04-18 | 山东中实易通集团有限公司 | Method for eliminating influence of backpressure change of air-cooled unit on automatic gain control (AGC) regulation quality |
| CN102707620A (en) * | 2012-06-05 | 2012-10-03 | 江西省电力科学研究院 | Backpressure control system of large air-cooler unit |
| CN105571343A (en) * | 2014-10-31 | 2016-05-11 | 王砧 | Operation back pressure continuous optimized control method and system for air-cooled generator unit steam turbine |
| CN205352114U (en) * | 2015-12-09 | 2016-06-29 | 乔治洛德方法研究和开发液化空气有限公司 | Air cooling condenser unit that operation is optimized |
| CN105674760A (en) * | 2016-03-22 | 2016-06-15 | 西安热工研究院有限公司 | Joint air-cooling system and control method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109780884A (en) * | 2018-12-29 | 2019-05-21 | 中国神华能源股份有限公司 | Method for building up, control method, system and the unit of unit back pressuce model |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106247815B (en) | 2018-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103791485B (en) | Optimal control method of water supply system of thermal power generating unit | |
| CN104847427B (en) | Two drag a heavy vapor fuel gas Combined Cycle Unit AGC control method | |
| CN203404771U (en) | Frequency converter and adjusting valve control system of condensate water system | |
| CN104714566B (en) | A kind of condensate throttling control system and its method of controlling security | |
| CN202735797U (en) | Distributed control system for coal mine ventilation air oxidation generator set | |
| CN106016230A (en) | Once-through boiler starting system and method | |
| CN106247815A (en) | A kind of control method of the in line big machine air cooling system of the little machine of supercritical thermal power unit | |
| CN103277784B (en) | Supercritical coal-fired units pendant superheater tube wall temperature early warning optimal control method | |
| CN103309314A (en) | Metal wall temperature early warning optimization control method of high-temperature super-heater of supercritical coal-fired unit | |
| CN105512800A (en) | Method for determining peak adjustment scheduling of heat supply unit according to mode of ordering power by heat | |
| CN111255530A (en) | Thermal power generating unit load adjusting system and method assisted by butterfly valve with low-pressure cylinder | |
| CN111255529A (en) | Quick response automatic power generation control system and method for operation of heat supply cylinder switching unit | |
| CN107575854A (en) | A kind of double reheat power generation sets monitoring system | |
| CN105465823A (en) | Control method and system for preventing fuel-water ratio of once-through boiler of heat-engine plant from imbalance | |
| CN204730670U (en) | A kind of residual heat and energy comprehensive utilization TRT | |
| CN110056858A (en) | A kind of fired power generating unit Heater Terminal Temperature Difference adaptive regulation method and device | |
| CN211851929U (en) | Quick response automatic power generation control system during operation of heat supply cylinder cutting unit | |
| CN104315496A (en) | Equal temperature difference principle-based boiler exhaust smoke waste heat recovery system | |
| CN105090932A (en) | Superheater metal wall temperature control method for thermal power unit | |
| CN109028004A (en) | Peak regulation gas fired-boiler feedwater flow and pressure double-balance control system | |
| CN211777610U (en) | Thermal power generating unit load adjusting system with low-pressure cylinder butterfly valve is supplementary | |
| CN205172659U (en) | Synthesize refrigerated double reheat unit thermodynamic system | |
| CN104165352B (en) | A kind of nuclear power plant evaporator Water-Level Supervising System and method for supervising thereof | |
| CN204201868U (en) | A kind of boiler exhaust gas residual neat recovering system | |
| CN108730951B (en) | Auxiliary frequency modulation and peak shaving system and method by using high-pressure low-temperature economizer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |