CN106020164A - Rapid fuel value correction method applied to thermal power generating unit - Google Patents
Rapid fuel value correction method applied to thermal power generating unit Download PDFInfo
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- CN106020164A CN106020164A CN201610675744.2A CN201610675744A CN106020164A CN 106020164 A CN106020164 A CN 106020164A CN 201610675744 A CN201610675744 A CN 201610675744A CN 106020164 A CN106020164 A CN 106020164A
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- 239000000446 fuel Substances 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000002485 combustion reaction Methods 0.000 claims description 21
- 230000003068 static effect Effects 0.000 claims description 14
- 240000002853 Nelumbo nucifera Species 0.000 claims description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims description 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims description 2
- 238000010977 unit operation Methods 0.000 abstract description 7
- 238000004364 calculation method Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 2
- 238000013500 data storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
Classifications
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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
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41845—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by system universality, reconfigurability, modularity
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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
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/33—Director till display
- G05B2219/33273—DCS distributed, decentralised controlsystem, multiprocessor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
Abstract
The invention discloses a rapid fuel value correction method applied to a thermal power generating unit. Whether a unit load steady-state condition appears or not is judged in real time, when the load steady-state condition is ended, a load dynamic starting condition and a load dynamic finishing condition appear sequentially, and load instruction, actual load, a fuel instrument and actual fuel collection and storage are performed in the load dynamic finishing condition; fuel value deviation calculation is performed after the load steady-state condition appears; a heat value deviation value obtained through calculation is stored as a correction value of the fuel static-state feed-forward quantity in the load dynamic starting condition and acts in unit coordination control, and the fuel static-state feed-forward which is controlled by an open ring originally is controlled by a closed ring, so that closed ring correction of fuel value deviation is achieved. According to the method, in fuel correction of thermal power generating unit conventional coordination control, disturbance generated by fuel value changes on a system in the actual adjusting process can be overcome, control balance is rapidly built, the stability and robustness of the control system are improved, and finally safety and economy of unit operation are finally improved.
Description
Technical field
The invention belongs to industrial stokehold technical field, particularly to a kind of fast fuel heat being applied to fired power generating unit
Value correcting method, is based on the closed-loop corrected fast fuel calorific value correction coordinating fuel feedforward metering method in control.
Background technology
The calorific value change of fired power generating unit fuel is the key factor affecting unit operation.The change of fuel value certainly will be serious
Affect the energy balance and the flow equilibrium of system, also can have a strong impact on the regulation quality of supercritical unit control system, even ripple
And the stability of unit operation.In the calorific value bearing calibration of fired power generating unit, existing many research from theory to emulation, its
Mostly occupy complicated intelligent control method, also have with a certain distance from practical.And conventional project application calorific value bearing calibration is only
Being the embodiment of an orientation, correction accuracy shortcoming and response time are longer.
Summary of the invention
Object of the present invention is to provide a kind of fast fuel calorific value bearing calibration being applied to fired power generating unit, by thermoelectricity
Unit operation operating mode is divided into dynamic starting stage, dynamic ending phase and three operating modes of steady-state process.Enter at this three phases
Row load, the storage of fuel and calculating, before obtaining the fuel static state that fast fuel calorific value deviation signal is applied in coordination control
In feedback.
To achieve these goals, the technical scheme is that
A kind of fast fuel calorific value bearing calibration being applied to fired power generating unit, the control system of described fired power generating unit is for circulation periodically
The scattered control system of scanning, wherein, described bearing calibration is: in units of the scattered control system scan period, real-time judge
The appearance of unit load steady state condition, after load steady state condition terminates therewith order follow occur load dynamically start operating mode and
Load dynamically terminates operating mode, dynamically terminates operating mode at load and carries out load instruction, actual load, fuel command and natural fuel
Gather and storage；The calculating of fuel value deviation is carried out after load steady state condition occurs；The calorific value deviation value calculated exists
Load dynamically starts the interior correction value as fuel static state feedforward amount of operating mode and stores and act in unit cooperative control, and fuel is quiet
State feedforward is transferred to closed loop control by original opened loop control and realizes the closed-loop corrected of fuel value deviation.
Scheme is further: it is sent after load steady state condition terminates that described load dynamically starts operating mode duration
Pulse width duration signal；Described load dynamically terminate operating mode duration be judge obtain load dynamically terminate operating mode occur after with
The collection of load instruction, actual load, fuel command and natural fuel that the scan period is carried out and storage duration.
Scheme is further: described pulse width duration is not more than 3 seconds.
Scheme is further: described method farther includes: dynamically start operating mode pulse width duration signal node at load
Judge after bundle: be that described load dynamically terminates operating mode and starts when load changing rate is less than 2MW/min.
Scheme is further: described method farther includes: when described load steady state condition terminates post fuel calorific value deviation
Calculating be not over, described load dynamically start operating mode duration pulse width duration signal wait fuel value deviation meter
Calculation sends after terminating.
Scheme is further: described load steady state condition judges: depend on load, fuel and main steam pressure for judging
According to, when load changing rate is less than less than 5t/h/min, main steam pressure rate of change less than 2MW/min, rate of fuel change
During 0.3MPa/min, it is judged that unit is steady state condition.
Scheme is further: described method farther includes: when the load stable state run within the scan period occurs without,
Using the front calorific value deviation value once stored as the correction value of scan period fuel static state feedforward amount before the scan period terminates
Store and act in unit cooperative control.
Scheme is further: described calorific value deviation value calculating method is: { (current steady state fuel-upper bistable design heat
Value fuel) ÷ (current steady state design combustion value fuel-upper moment bistable design combustion value fuel) } ÷ load variations amount；
Wherein: described design combustion value fuel design combustion value fuel from thermal power unit boiler specification and load relationship graph
Middle acquisition.
Scheme is further: the described scattered control system scan period is not more than 500ms.
The shortcoming that the present invention is to solve conventional fuel calorific value bearing calibration, with the scattered control system scan period as calorific value
In the coefficient correction cycle, carrying out closed-loop corrected to fuel static state feedforward amount in real time, its bearing calibration is for enter in units of the scan period
Row iteration calculates, and real-time working condition is divided into dynamic starting stage, dynamic ending phase and steady-state process, and on these three rank
Duan Jinhang load, the storage of fuel and calculating, finally give quick equivalent heat value deviation signal and introduce in coordinated control system
Carry out computing, it is achieved the quick real time correction of fuel value, fired power generating unit is controlled quickly setting up and unit safety warp of balance
Ji runs important in inhibiting.
The inventive method in fired power generating unit routine coordinates the fuel correction controlled, quick by computer control station
Fuel value correcting algorithm can overcome the fuel value change disturbance to system generation during practical adjustments, quickly sets up control
Balance, improves stability and the robustness of control system, the final safety improving unit operation and economy.
With embodiment, invention is described in detail below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the flow chart of the fast fuel calorific value correction being applied to fired power generating unit that the present invention provides.
Detailed description of the invention
A kind of fast fuel calorific value bearing calibration being applied to fired power generating unit, the control system of described fired power generating unit is for circulation periodically
The scattered control system of scanning, wherein, described bearing calibration is: in units of the scattered control system scan period, real-time judge
The appearance of unit load steady state condition, after load steady state condition terminates therewith order follow occur load dynamically start operating mode and
Load dynamically terminates operating mode, dynamically terminates operating mode at load and carries out load instruction, actual load, fuel command and natural fuel
Gather and storage；The calculating of fuel value deviation is carried out after load steady state condition occurs；The calorific value deviation value calculated exists
Load dynamically starts the interior correction value as fuel static state feedforward amount of operating mode and stores and act in unit cooperative control, and fuel is quiet
State feedforward is transferred to closed loop control by original opened loop control and realizes the closed-loop corrected of fuel value deviation.
In fast fuel calorific value bearing calibration, whole unit is considered as state observer, with decentralised control by the present embodiment
The system scan period is unit, and the load of real-time judge unit operation dynamically starts, load dynamically terminates and load stable state three
Operating mode.Dynamically start operating mode realizes the closed-loop corrected of fuel value deviation at load；Dynamically terminate operating mode realizes at load
The collection of load instruction, actual load, fuel command and natural fuel and storage；Fuel value is realized inclined at load steady state condition
The calculating of difference.
In embodiment: described load steady state condition is: with load, fuel and main steam pressure as basis for estimation, work as load
When rate of change is less than 0.3MPa/min less than 2MW/min, rate of fuel change less than 5t/h/min, main steam pressure rate of change, sentence
Off line group is steady state condition.
In embodiment: it is the pulse sent after load steady state condition terminates that described load dynamically starts operating mode duration
Width duration signal；It is to judge that obtaining load dynamically terminates after operating mode occurs with scanning that described load dynamically terminates operating mode duration
The collection of load instruction, actual load, fuel command and natural fuel that the cycle is carried out and storage duration.Further, steady with load
State operating mode is the duration dynamically starting operating mode within disappearing latter 3 seconds, and therefore, described pulse width duration is not more than 3 seconds, generally
Just can complete to store also the calorific value deviation value calculated as the correction value of fuel static state feedforward amount 2 scan periods
Act in unit cooperative control.And when the scan period is 0.5 second, within 3 seconds, be 6 scan periods.
Judge after load dynamically starts operating mode pulse width duration signal ended: when load changing rate is less than 2MW/min
Time be that described load dynamically terminates operating mode and starts；This operating mode is between dynamically starting between steady state condition.
But, the duration of load steady state condition is a kind of variable, carries out fuel heat after judging the appearance of load steady state condition
The calculating of value deviation, but calculate and be not over, now load steady state condition finishes, and therefore, described method farther includes:
Being not over when described load steady state condition terminates the calculating of post fuel calorific value deviation, described load dynamically starts operating mode duration
Pulse width duration signal waits that the calculating of fuel value deviation sends after terminating.
Wherein:
In embodiment: described method farther includes: when the load stable state run within the scan period occurs without, in scanning week
The front calorific value deviation value once stored is stored as the correction value of scan period fuel static state feedforward amount and makees before terminating by the phase
It is used in unit cooperative control.
In embodiment: described calorific value deviation value calculating method is: { (current steady state fuel-upper bistable design calorific value combustion
Material) ÷ (current steady state design combustion value fuel-upper moment bistable design combustion value fuel) } ÷ load variations amount；
Wherein design combustion value fuel relation intrinsic with load has fired power generating unit thermodynamic property to determine.Different unit design calorific value combustions
Material and load relation is different, refers specifically to load and the relation designed between combustion value fuel in unit running process (how many
How many load correspondences designs combustion value fuel).
As shown in the table:
X(load percentage ratio %): 0 25.7 44.3 53.0 65.2 76.5 100 110
Y(designs combustion value fuel %): 0 28.1 46.2 54.8 66.8 77.7 100 100
Therefore, described design combustion value fuel design combustion value fuel from thermal power unit boiler specification and load relationship graph
Middle acquisition.
In embodiment: the described scattered control system scan period is not more than 500ms.
Wherein: as it is shown in figure 1, described method flow is: information fusion and process the main air pressure of real-time collection, actual negative
The parameters such as lotus, natural fuel and process variable carry out the judgement of stable state, in dynamic operation condition, will be calculated when dynamically starting
Fuel deviation signal delivers to fuel static state feedforward amount and therrmodynamic system control object through discrete processes, and by load and fuel
Memory element is sent in instruction；At the end of dynamically, again load and fuel command are sent into memory element in case steady state condition is adjusted
With.In steady state condition, first call load and the fuel signal in two stable state moment in memory element, and it is inclined to carry out fuel value
The calculating of difference signal, calculation is: { (current steady state designs (current steady state fuel-upper bistable design combustion value fuel) ÷
Combustion value fuel-upper moment bistable design combustion value fuel) } ÷ load variations amount.Then the fuel value deviation letter after calculating
Number store to temporary location, call when dynamic operation condition.Owing to unit is in actual motion, dynamic operation condition and steady state condition can not
Breaking and be alternately present, therefore this algorithm can circulate therewith and carry out, it is achieved loop iteration corrects.
Above-described embodiment comprises data acquisition, algorithm is implemented and circulation correction three layers.Involved mainly thermal motor
The fuel correction of group and algorithm based on DCS platform realize.
The enforcement of above-described embodiment is the meter controlling to contain DCS system by having the computer workstation of analysis program to go
Calculating machine controller, controller connects feeder rotational speed regulation by output control circuit after converting digital signals into analogue signal
Device.
This method is understood more readily from be: 1. gather sound state during thermal power unit operation by real-time circulation
Load and fuel, be in the order of static state-dynamic-static by acquired data storage to algorithm unit according to load.2. fire is combined
Group of motors fuel design calorific value calculates Current fuel calorific value with the intrinsic relation of load and designs the deviation of calorific value, and this deviation is
The correction value of next dynamic operation condition fuel value；3. under load dynamic operation condition, by the deviation action calculated to coordinating control
In system in the static feed forward variable of fuel adjusting, treat that next steady state load operating mode occurs, repeat 1. and the most described method is with reality
The existing quick real time correction of fuel value.
In embodiment: with load, fuel and main steam pressure as basis for estimation, when load changing rate less than 2MW/min,
When rate of fuel change is less than 0.3MPa/min less than 5t/h/min, main steam pressure rate of change, it is judged that unit is steady state condition, no
Then unit is dynamic operation condition, judges it is dynamically to start operating mode or dynamically terminate operating mode according to load instruction in dynamic operation condition,
Wherein: the correction value of fuel static state feedforward amount is acted in unit cooperative control as dynamically starting operating mode, load will be realized
The collection of instruction, actual load, fuel command and natural fuel and storage are as dynamically terminating operating mode.
Claims (9)
1. being applied to a fast fuel calorific value bearing calibration for fired power generating unit, the control system of described fired power generating unit is fixed for circulation
The scattered control system of phase scanning, it is characterised in that described bearing calibration is: in units of the scattered control system scan period,
The appearance of real-time judge unit load steady state condition, sequentially follows therewith after load steady state condition terminates and occurs that load is dynamically opened
Beginning operating mode and load dynamically terminate operating mode, dynamically terminate operating mode at load and carry out load instruction, actual load, fuel command and reality
The collection of border fuel and storage；The calculating of fuel value deviation is carried out after load steady state condition occurs；The calorific value calculated
Deviation value correction value as fuel static state feedforward amount in load dynamically starts operating mode stores and acts on unit cooperative control
In, the feedforward of fuel static state is transferred to closed loop control by original opened loop control and realizes the closed-loop corrected of fuel value deviation.
Bearing calibration the most according to claim 1, it is characterised in that it is at load that described load dynamically starts operating mode duration
The pulse width duration signal that steady state condition sends after terminating；It is to obtain in judgement that described load dynamically terminates operating mode duration
Load instruction, actual load, fuel command and the natural fuel that load dynamically terminates to carry out with the scan period after operating mode occurs
Gather and storage duration.
Bearing calibration the most according to claim 2, it is characterised in that described pulse width duration is not more than 3 seconds.
Bearing calibration the most according to claim 2, it is characterised in that described method farther includes: dynamically open at load
Judge after beginning operating mode pulse width duration signal ended: be that described load dynamically terminates when load changing rate is less than 2MW/min
Operating mode starts.
Bearing calibration the most according to claim 2, it is characterised in that described method farther includes: when described load is steady
State operating mode terminates the calculating of post fuel calorific value deviation and is not over, and described load dynamically starts the pulse width duration of operating mode duration
Signal waits that the calculating of fuel value deviation sends after terminating.
Bearing calibration the most according to claim 1 and 2, it is characterised in that the judgement of described load steady state condition is: with negative
Lotus, fuel and main steam pressure are basis for estimation, when load changing rate less than 2MW/min, rate of fuel change less than 5t/h/
When min, main steam pressure rate of change are less than 0.3MPa/min, it is judged that unit is steady state condition.
Bearing calibration the most according to claim 1 and 2, it is characterised in that described method farther includes: when in scanning week
When the load stable state run in phase occurs without, using the front calorific value deviation value once stored as scanning week before the scan period terminates
The phase correction value of fuel static state feedforward amount stores and acts in unit cooperative control.
Bearing calibration the most according to claim 1 and 2, it is characterised in that described calorific value deviation value calculating method is: (when
Presteady state fuel-upper bistable design combustion value fuel) ÷ (current steady state design combustion value fuel-upper moment bistable design heat
Value fuel) } ÷ load variations amount；
Wherein: described design combustion value fuel design combustion value fuel from thermal power unit boiler specification and load relationship graph
Middle acquisition.
Bearing calibration the most according to claim 1 and 2, it is characterised in that the described scattered control system scan period is little
In 500ms.
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| CN201610675744.2A CN106020164B (en) | 2016-08-17 | 2016-08-17 | A kind of fast fuel calorific value bearing calibration applied to fired power generating unit |
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| CN201610675744.2A CN106020164B (en) | 2016-08-17 | 2016-08-17 | A kind of fast fuel calorific value bearing calibration applied to fired power generating unit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106773669A (en) * | 2016-11-21 | 2017-05-31 | 华北电力大学（保定） | A kind of fired power generating unit control method for coordinating of fuel value real-time adaptive correction |
| CN107906499A (en) * | 2017-10-09 | 2018-04-13 | 李吉宁 | Fired power generating unit intelligence control system |
| CN108052007A (en) * | 2017-12-18 | 2018-05-18 | 华润电力湖北有限公司 | Thermal power unit operation optimization method, device, equipment and computer storage media |
| CN108490794A (en) * | 2018-05-22 | 2018-09-04 | 马鞍山当涂发电有限公司 | 660MW supercritical unit AGC control systems under a kind of depth peak regulation |
| CN112379650A (en) * | 2020-11-20 | 2021-02-19 | 西安热工研究院有限公司 | Gradient constrained coal-fired unit heat value correction method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106773669A (en) * | 2016-11-21 | 2017-05-31 | 华北电力大学（保定） | A kind of fired power generating unit control method for coordinating of fuel value real-time adaptive correction |
| CN107906499A (en) * | 2017-10-09 | 2018-04-13 | 李吉宁 | Fired power generating unit intelligence control system |
| CN108052007A (en) * | 2017-12-18 | 2018-05-18 | 华润电力湖北有限公司 | Thermal power unit operation optimization method, device, equipment and computer storage media |
| CN108490794A (en) * | 2018-05-22 | 2018-09-04 | 马鞍山当涂发电有限公司 | 660MW supercritical unit AGC control systems under a kind of depth peak regulation |
| CN108490794B (en) * | 2018-05-22 | 2021-02-02 | 马鞍山当涂发电有限公司 | AGC control system of 660MW supercritical unit under deep peak regulation |
| CN112379650A (en) * | 2020-11-20 | 2021-02-19 | 西安热工研究院有限公司 | Gradient constrained coal-fired unit heat value correction method |
| CN112379650B (en) * | 2020-11-20 | 2022-02-11 | 西安热工研究院有限公司 | Gradient constrained coal-fired unit heat value correction method |
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