CN108646558A - A kind of Energy-saving for Thermal Power Units type sliding pressure real-time optimization method and system - Google Patents
A kind of Energy-saving for Thermal Power Units type sliding pressure real-time optimization method and system Download PDFInfo
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- CN108646558A CN108646558A CN201810444285.6A CN201810444285A CN108646558A CN 108646558 A CN108646558 A CN 108646558A CN 201810444285 A CN201810444285 A CN 201810444285A CN 108646558 A CN108646558 A CN 108646558A
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- sliding pressure
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
Abstract
The invention discloses a kind of Energy-saving for Thermal Power Units type sliding pressure real-time optimization method and system, the present invention determines the comprehensive valve bit instruction of optimum operation valve point according to steam turbine valve rating curveG, calculate comprehensive valve bit instructionGWith valve position reference valueG’Deviation and controlled to obtain sliding pressure drift correction value ΔP s；Initial sliding pressure setting value is obtained according to unit load instructionP sAnd it corrects to obtain sliding pressure correction value using unit operation parameter and thermal parameterP’ s；By sliding pressure drift correction value ΔP s, sliding pressure correction valueP’ sAddition obtains final sliding pressure setting valuePAnd it is sent into the coordinated control system of fired power generating unit.The present invention to the optimization of unit sliding pressure setting value by that will be converted into the control to steam turbine optimum operation valve point, on-line tuning can be carried out to sliding pressure setting value according to actual operating mode in unit running process, steam turbine is set to maintain best valve point operation, to reduce restriction loss, the economy of unit operation is improved.
Description
Technical field
The present invention relates to thermal power generation unit automatic control technologys, and in particular to a kind of Energy-saving for Thermal Power Units type sliding pressure is real-time
Optimization method and system.
Background technology
Heat consumption is reduced to Large-scale fire-electricity unit using sliding pressure operation mode, energy-saving and emission-reduction are of universal significance.Wherein, sliding pressure
Curve（That is sliding pressure setting value）It is the important parameter that need to be determined.Currently, in engineer application, generally use test method is each
Typical load point finds best main steam pressure force value, obtains a best sliding pressure operation in full load variation range accordingly
Curve, and be cured to unit DCS (abbreviation of English " Distributed Control System ", Chinese translation be " point
Dissipate control system ".) in, to realize the economical operation of unit.
However in practice, due to unit operation operating mode（Such as condenser pressure, steam extraction amount, main steam temperature etc.）Often
Operating condition when experiment can be deviateed so that the best main steam pressure of unit can deviate its former setting value.Therefore, use is single
A changeless sliding pressure curve, cannot be satisfied the requirement that unit is in optimal operational condition.In order to ensure that unit is in office
Can be under best main steam pressure and run under what operating mode, it just must be according to the actual operating mode of unit, to sliding pressure curve
Carry out real-time on-line tuning.Fired power generating unit is a kind of controlled device having compared with large delay and inertia.
Invention content
The technical problem to be solved in the present invention：For the above problem of the prior art, a kind of Energy-saving for Thermal Power Units type is provided
Sliding pressure real-time optimization method and system.The present invention is by will be converted into steam turbine most good speed the optimization of unit sliding pressure setting value
The control of row valve point can carry out on-line tuning to sliding pressure setting value according to actual operating mode in unit running process, make
Steam turbine maintains best valve point operation, to reduce restriction loss, improves the economy of unit operation.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of Energy-saving for Thermal Power Units type sliding pressure real-time optimization method, implementation steps include：
1）According to steam turbine valve rating curve, the optimum operation valve point of steam turbine is determined, and determine optimum operation valve point
Corresponding comprehensive valve bit instructionG；
2）By the valve position reference value of steam turbineG’As the value of feedback of comprehensive valve bit instruction, calculates and to be determined by optimum operation valve point
Comprehensive valve bit instructionGWith the valve position reference value of steam turbineG’Between deviation, deviation is then sent into controller, and output it
Value is used as sliding pressure drift correction value ΔP s；
3）Initial sliding pressure setting value is obtained according to unit load instructionP s, and using unit operation parameter and thermal parameter to first
The sliding pressure setting value of beginningP sIt is modified to obtain sliding pressure correction valueP’ s；
4）By sliding pressure drift correction value ΔP s, sliding pressure correction valueP’ sAddition obtains final sliding pressure setting valueP；
5）By sliding pressure setting valuePIt is sent into the coordinated control system of fired power generating unit, changes the input of boiler by coordinated control system
Main steam pressure is measured and then changed, steam turbine is made to maintain best valve point operation.
Preferably, step 3）Detailed step include：
3.1）Function based on the instruction of preset unit loadf(x) according to the initial sliding pressure setting value of unit load instruction acquisitionP s；
3.2）Sliding pressure modifying factor is determined using unit operation parameter and thermal parameterδ, sliding pressure modifying factorδValue range be
[0.95,1.05]；
3.3）According toP’ s=δ×P sTo initial sliding pressure setting valueP sIt is modified to obtain sliding pressure correction valueP’ s, whereinP sIt is first
The sliding pressure setting value of beginning,δFor sliding pressure modifying factor.
Preferably, step 3.2）It is middle to determine sliding pressure modifying factor using unit operation parameter and thermal parameterδFunction table
It is up to formula：
δ=1+(P c-P c0)×C0
In above formula,δFor sliding pressure modifying factor,P cFor condenser pressure,P c0For condenser pressure design value, C0For condenser pressure
Often correction factors of the variation 1KPa to unit output percentage.
The present invention also provides a kind of Energy-saving for Thermal Power Units type sliding pressure real-time optimization system, including computer equipment, the calculating
Machine equipment is programmed to perform the step of Energy-saving for Thermal Power Units type sliding pressure real-time optimization method of the present invention.
Present invention tool has the advantage that：The present invention will be converted into steam turbine most good speed the optimization of unit sliding pressure setting value
The control of row valve point, control object is more clear, and engineer application is more simple；It can be according to reality during thermal power unit operation
Border operating condition carries out on-line tuning to sliding pressure setting value, and steam turbine is made to maintain best valve point operation, to reduce throttling damage
It loses, achievees the purpose that energy-saving.
Description of the drawings
Fig. 1 is the basic procedure schematic diagram of one method of the embodiment of the present invention.
Fig. 2 is that the SAMA of one method of the embodiment of the present invention schemes.
Specific implementation mode
Embodiment one：
As depicted in figs. 1 and 2, a kind of implementation steps of Energy-saving for Thermal Power Units type sliding pressure real-time optimization method of the present embodiment include：
1）According to steam turbine valve rating curve, the optimum operation valve point of steam turbine is determined, and determine optimum operation valve point
Corresponding comprehensive valve bit instructionG；
2）By the valve position reference value of steam turbineG’As the value of feedback of comprehensive valve bit instruction, calculates and to be determined by optimum operation valve point
Comprehensive valve bit instructionGWith the valve position reference value of steam turbineG’Between deviation, deviation is then sent into PID controller, and by its
Output valve is as sliding pressure drift correction value ΔP s；
3）Initial sliding pressure setting value is obtained according to unit load instructionP s, and using unit operation parameter and thermal parameter to first
The sliding pressure setting value of beginningP sIt is modified to obtain sliding pressure correction valueP’ s；
4）By sliding pressure drift correction value ΔP s, sliding pressure correction valueP’ sAddition obtains final sliding pressure setting valueP；
5）By sliding pressure setting valuePIt is sent into the coordinated control system of fired power generating unit, changes the input of boiler by coordinated control system
Main steam pressure is measured and then changed, steam turbine is made to maintain best valve point operation.
Steam turbine valve rating curve refers to main steam into steam flow amount（It is indicated with comprehensive valve bit instruction）With each high pressure
One group of curve of pitch aperture correspondence.Steam turbine valve aperture is bigger, and restriction loss is smaller, is got over to the regulating power of load
It is weak；Conversely, steam turbine valve aperture is smaller, restriction loss is bigger, stronger to the regulating power of load.Steam turbine optimum operation valve
The determining principle of point, which is steam turbine, can meet the needs of primary frequency modulation and varying duty initial stage load variations amount and steam turbine valve
Door aperture is in the smaller position of restriction loss.When steam turbine is practical have into steam flow amount and comprehensive valve bit instruction it is preferable linearly right
When should be related to（The steam turbine valve rating curve being arranged can really reflect the practical into steam flow amount of steam turbine）, in order to
Ensure to disclosure satisfy that the demand of maximum primary frequency modulation amount and varying duty initial stage to load variations amount, this implementation when stable operation of unit
By comprehensive valve bit instruction in exampleG=94% is set as the optimum operation valve point of steam turbine.
In the present embodiment, step 2）In when unit is in stable state, the sliding pressure based on optimum operation valve point is adjusted online
Whole function input.According to the comprehensive valve bit instruction determined by optimum operation valve pointGWith the valve position reference value of steam turbineG’Between
Deviation is adjusted by PID controller, and outputs it value ΔP sAs the correction value to sliding pressure.
In the present embodiment, step 3）Detailed step include：
3.1）Function based on the instruction of preset unit loadf(x) according to the initial sliding pressure setting value of unit load instruction acquisitionP s；
3.2）Sliding pressure modifying factor is determined using unit operation parameter and thermal parameterδ, sliding pressure modifying factorδValue range be
[0.95,1.05]；
3.3）According toP’ s=δ×P sTo initial sliding pressure setting valueP sIt is modified to obtain sliding pressure correction valueP’ s, whereinP sIt is first
The sliding pressure setting value of beginning,δFor sliding pressure modifying factor.
In the present embodiment, step 3.2）It is middle to determine sliding pressure modifying factor using unit operation parameter and thermal parameterδLetter
Counting expression formula is：
δ=1+(P c-P c0)×C0
In above formula,δFor sliding pressure modifying factor,P cFor condenser pressure,P c0For condenser pressure design value, C0For condenser pressure
Often correction factors of the variation 1KPa to unit output percentage.Correction factor C0The design data that can be provided according to equipment manufacturer selects
It takes, can also be obtained by testing.
The present embodiment also provides a kind of Energy-saving for Thermal Power Units type sliding pressure real-time optimization system, including computer equipment, the meter
Calculate the step of machine equipment is programmed to perform Energy-saving for Thermal Power Units type sliding pressure real-time optimization method of the present invention.
Embodiment two：
The present embodiment and embodiment one are essentially identical, and main difference is：Step 3 in the present embodiment）In due to unit capacity
Difference, condenser pressure often change correction factor Cs of the 1KPa to unit output percentage0Difference, step is identical as embodiment one,
Details are not described herein.
Embodiment three：
The present embodiment and embodiment one are essentially identical, and main difference is：Step 2 in the present embodiment）The control that deviation is sent into
Device processed is fuzzy controller, and carrying out fuzzy operation to the deviation of input by fuzzy controller obtains sliding pressure drift correction value ΔP s；In addition, controller can also use other existing controllers such as predictor controller etc. as needed.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (4)
1. a kind of Energy-saving for Thermal Power Units type sliding pressure real-time optimization method, it is characterised in that implementation steps include：
1）According to steam turbine valve rating curve, the optimum operation valve point of steam turbine is determined, and determine optimum operation valve point
Corresponding comprehensive valve bit instructionG；
2）By the valve position reference value of steam turbineG’As the value of feedback of comprehensive valve bit instruction, calculates and to be determined by optimum operation valve point
Comprehensive valve bit instructionGWith the valve position reference value of steam turbineG’Between deviation, deviation is then sent into controller, obtains its output
Value is used as sliding pressure drift correction value ΔP s；
3）Initial sliding pressure setting value is obtained according to unit load instructionP s, and using unit operation parameter and thermal parameter to first
The sliding pressure setting value of beginningP sIt is modified to obtain sliding pressure correction valueP’ s；
4）By sliding pressure drift correction value ΔP s, sliding pressure correction valueP’ sAddition obtains final sliding pressure setting valueP；
5）By sliding pressure setting valuePIt is sent into the coordinated control system of fired power generating unit, changes the input of boiler by coordinated control system
Main steam pressure is measured and then changed, steam turbine is made to maintain best valve point operation.
2. Energy-saving for Thermal Power Units type sliding pressure real-time optimization method according to claim 1, which is characterized in that step 3）It is detailed
Carefully step includes：
3.1）Function based on the instruction of preset unit loadf(x) according to the initial sliding pressure setting value of unit load instruction acquisitionP s；
3.2）Sliding pressure modifying factor is determined using unit operation parameter and thermal parameterδ, sliding pressure modifying factorδValue range be
[0.95,1.05]；
3.3）According toP’ s=δ×P sTo initial sliding pressure setting valueP sIt is modified to obtain sliding pressure correction valueP’ s, whereinP sIt is first
The sliding pressure setting value of beginning,δFor sliding pressure modifying factor.
3. Energy-saving for Thermal Power Units type sliding pressure real-time optimization method according to claim 2, which is characterized in that step 3.2）In
Sliding pressure modifying factor is determined using unit operation parameter and thermal parameterδFunction expression be：
δ=1+(P c-P c0)×C0
In above formula,δFor sliding pressure modifying factor,P cFor condenser pressure,P c0For condenser pressure design value, C0For condenser pressure
Often correction factors of the variation 1KPa to unit output percentage.
4. a kind of Energy-saving for Thermal Power Units type sliding pressure real-time optimization system, including computer equipment, it is characterised in that：The computer is set
Standby the step of being programmed to perform any one of claims 1 to 3 Energy-saving for Thermal Power Units type sliding pressure real-time optimization method.
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| CN201810444285.6A CN108646558A (en) | 2018-05-10 | 2018-05-10 | A kind of Energy-saving for Thermal Power Units type sliding pressure real-time optimization method and system |
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| CN201810444285.6A CN108646558A (en) | 2018-05-10 | 2018-05-10 | A kind of Energy-saving for Thermal Power Units type sliding pressure real-time optimization method and system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262281A (en) * | 2019-05-07 | 2019-09-20 | 东南大学 | Unit sliding pressure operation control method and system |
| CN110488601A (en) * | 2019-09-26 | 2019-11-22 | 山东和信智能科技有限公司 | Fired power generating unit load control system optimization system and method based on Real-time Monitoring Data |
| CN111027748A (en) * | 2019-11-11 | 2020-04-17 | 国网湖南省电力有限公司 | Method, system and medium for optimizing multivariate function of sliding pressure operation curve of thermal generator set in real time |
| CN111142373A (en) * | 2019-12-31 | 2020-05-12 | 武汉天之渌科技有限公司 | Flow control method and device based on intelligent metering valve |
| CN112000012A (en) * | 2020-08-14 | 2020-11-27 | 浙江浙能绍兴滨海热电有限责任公司 | Unit sliding pressure control optimization method and system based on thermoelectric load condition |
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| WO2015003898A1 (en) * | 2013-07-12 | 2015-01-15 | Siemens Aktiengesellschaft | Pre-heating system and method with such a pre-heating system |
| CN106527131A (en) * | 2016-10-27 | 2017-03-22 | 哈尔滨工业大学 | Model used for carrying out primary frequency modulation analysis coordination control on boiler, steam turbine and power grid |
| CN108005735A (en) * | 2017-11-04 | 2018-05-08 | 国网江西省电力公司电力科学研究院 | A kind of real-time dynamic correcting method of optimal first pressing of Steam Turbine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262281A (en) * | 2019-05-07 | 2019-09-20 | 东南大学 | Unit sliding pressure operation control method and system |
| CN110488601A (en) * | 2019-09-26 | 2019-11-22 | 山东和信智能科技有限公司 | Fired power generating unit load control system optimization system and method based on Real-time Monitoring Data |
| CN111027748A (en) * | 2019-11-11 | 2020-04-17 | 国网湖南省电力有限公司 | Method, system and medium for optimizing multivariate function of sliding pressure operation curve of thermal generator set in real time |
| CN111027748B (en) * | 2019-11-11 | 2022-04-26 | 国网湖南省电力有限公司 | Method, system and medium for optimizing multivariate function of sliding pressure operation curve of thermal generator set in real time |
| CN111142373A (en) * | 2019-12-31 | 2020-05-12 | 武汉天之渌科技有限公司 | Flow control method and device based on intelligent metering valve |
| CN112000012A (en) * | 2020-08-14 | 2020-11-27 | 浙江浙能绍兴滨海热电有限责任公司 | Unit sliding pressure control optimization method and system based on thermoelectric load condition |
| CN112000012B (en) * | 2020-08-14 | 2022-04-22 | 浙江浙能绍兴滨海热电有限责任公司 | Unit sliding pressure control optimization method and system based on thermoelectric load condition |
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Application publication date: 20181012 |