CN106020164B - A kind of fast fuel calorific value bearing calibration applied to fired power generating unit - Google Patents
A kind of fast fuel calorific value bearing calibration applied to fired power generating unit Download PDFInfo
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- CN106020164B CN106020164B CN201610675744.2A CN201610675744A CN106020164B CN 106020164 B CN106020164 B CN 106020164B CN 201610675744 A CN201610675744 A CN 201610675744A CN 106020164 B CN106020164 B CN 106020164B
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Abstract
The invention discloses a kind of fast fuel calorific value bearing calibrations applied to fired power generating unit, the appearance of real-time judge unit load steady state condition, it is sequentially followed therewith after load steady state condition and occurs that load dynamic starts operating mode and load dynamic terminates operating mode, terminate the acquisition and storage that operating mode carries out load instruction, actual load, fuel command and natural fuel in load dynamic；The calculating of fuel value deviation is carried out after the appearance of load steady state condition；Correction value of the calorific value deviation being calculated as fuel static state feedforward amount in load dynamic beginning operating mode is stored and acted in unit cooperative control, and the static feedforward of fuel switchs to closed-loop control by original opened loop control and realizes the closed-loop corrected of fuel value deviation.The method of the present invention is routinely coordinated in fired power generating unit in the fuel correction of control, fuel value changes the disturbance generated to system during practical adjustments can be overcome, it is quick to establish control balance, improve the stability and robustness of control system, the final security and economy for improving unit operation.
Description
Technical field
The invention belongs to industrial stokehold technical field, more particularly to a kind of fast fuel heat applied to fired power generating unit
Value correcting method is based on the closed-loop corrected fast fuel calorific value correction for coordinating fuel feedforward amount method in control.
Background technology
The calorific value variation of fired power generating unit fuel is an important factor for influencing unit operation.The variation of fuel value certainly will be serious
The energy balance and flow equilibrium of influence system can also seriously affect the regulation quality or even ripple of supercritical unit control system
And the stability of unit operation.In the calorific value bearing calibration of fired power generating unit, from theory to emulation on have many research,
Occupy complicated intelligent control method mostly, from it is practical also have with a certain distance from.And the bearing calibration of conventional project application calorific value is only
It is the embodiment of an orientation, correction accuracy is short of and the response time is longer.
The content of the invention
Object of the present invention is to provide a kind of fast fuel calorific value bearing calibration applied to fired power generating unit, by thermoelectricity
Unit operation operating mode is divided into three dynamic starting stage, dynamic ending phase and steady-state process operating modes.This three phases into
The storage and calculating of row load, fuel, 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 applied to fired power generating unit, the control system of the fired power generating unit is Xun Huan
The scattered control system of periodic scanning, wherein, the bearing calibration is：In units of the scattered control system scan period, in real time
Judge the appearance of unit load steady state condition, sequentially followed therewith after load steady state condition and load dynamic beginning work occur
Condition and load dynamic terminate operating mode, and terminating operating mode in load dynamic carries out load instruction, actual load, fuel command and actual combustion
The acquisition and storage of material；The calculating of fuel value deviation is carried out after the appearance of load steady state condition；The calorific value deviation being calculated
Correction value of the value as fuel static state feedforward amount in load dynamic beginning operating mode is stored and acted in unit cooperative control, is fired
The static feedforward of material switchs to closed-loop control by original opened loop control and realizes the closed-loop corrected of fuel value deviation.
Scheme is further：It is one sent after load steady state condition that the load dynamic, which starts operating mode duration,
Pulse width duration signal；Load dynamic terminate operating mode duration be judge to obtain load dynamic terminate after operating mode occurs with
The acquisition of load instruction, actual load, fuel command and natural fuel that scan period carries out and storage duration.
Scheme is further：The pulse width duration is not more than 3 seconds.
Scheme is further：The method is further included：Start operating mode pulse width duration signal node in load dynamic
Judge after beam：Terminate operating mode when load changing rate is less than 2MW/min for load dynamic to start.
Scheme is further：The method is further included：The fuel value deviation after the load steady state condition
Calculating be not over, the pulse width duration signal that load dynamic starts operating mode duration waits the meter of fuel value deviation
It is sent after calculation.
Scheme is further：The load steady state condition judges：Using load, fuel and main steam pressure as judge according to
According to when load changing rate is less than 2MW/min, rate of fuel change is less than 5t/h/min, main steam pressure change rate is less than
During 0.3MPa/min, judge unit for steady state condition.
Scheme is further：The method is further included：When the load stable state run within the scan period does not occur,
Using the preceding calorific value deviation once stored as the correction value of scan period fuel static state feedforward amount before terminating in the scan period
It stores and acts in unit cooperative control.
Scheme is further：The calorific value deviation value calculating method is：{（Current steady state fuel-upper bistable design heat
It is worth fuel）÷ (current steady state designs combustion value fuel-last moment bistable design combustion value fuel) } ÷ load variations amounts；
Wherein：The combustion value fuel that designs is from the design combustion value fuel in thermal power unit boiler specification and load relation
It is obtained in chart.
Scheme is further：The scattered control system scan period is not more than 500ms.
The present invention is in order to solve the disadvantage that conventional fuel calorific value bearing calibration, using the scattered control system scan period as calorific value
The coefficient correction cycle, in real time to fuel static state feedforward amount carry out it is closed-loop corrected, bearing calibration be in units of the scan period into
Row iteration calculates, and real-time working condition is divided into dynamic starting stage, dynamic ending phase and steady-state process, and in this three ranks
The storage and calculating of Duan Jinhang loads, fuel finally obtain quick equivalent heat value deviation signal and are introduced into coordinated control system
Computing is carried out, realizes the quick real time correction of fuel value, the quick foundation and unit safety of fired power generating unit control balance are passed through
Ji operation important in inhibiting.
The method of the present invention is in fired power generating unit routinely coordinates the fuel correction of control, by quick in computer control station
Fuel value correcting algorithm can overcome disturbance of the fuel value variation to system generation during practical adjustments, quick to establish control
Balance improves the stability and robustness of control system, the final security and economy for improving unit operation.
Invention is described in detail with reference to the accompanying drawings and examples.
Description of the drawings
Fig. 1 is the flow chart that the fast fuel calorific value provided by the invention applied to fired power generating unit corrects.
Specific embodiment
A kind of fast fuel calorific value bearing calibration applied to fired power generating unit, the control system of the fired power generating unit is Xun Huan
The scattered control system of periodic scanning, wherein, the bearing calibration is：In units of the scattered control system scan period, in real time
Judge the appearance of unit load steady state condition, sequentially followed therewith after load steady state condition and load dynamic beginning work occur
Condition and load dynamic terminate operating mode, and terminating operating mode in load dynamic carries out load instruction, actual load, fuel command and actual combustion
The acquisition and storage of material；The calculating of fuel value deviation is carried out after the appearance of load steady state condition；The calorific value deviation being calculated
Correction value of the value as fuel static state feedforward amount in load dynamic beginning operating mode is stored and acted in unit cooperative control, is fired
The static feedforward of material switchs 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 by the present embodiment, with decentralised control
The system scan period is unit, and the load dynamic of real-time judge unit operation starts, load dynamic terminates and load stable state three
Operating mode.Start to realize the closed-loop corrected of fuel value deviation in operating mode in load dynamic；Terminate to realize in operating mode in load dynamic
The acquisition and storage of load instruction, actual load, fuel command and natural fuel；Realize that fuel value is inclined in load steady state condition
The calculating of difference.
In embodiment：The load steady state condition is：Using load, fuel and main steam pressure as basis for estimation, work as load
When change rate is less than 2MW/min, rate of fuel change is less than 5t/h/min, main steam pressure change rate is less than 0.3MPa/min, sentence
Off line group is steady state condition.
In embodiment：It is the pulse sent after load steady state condition that the load dynamic, which starts operating mode duration,
Width duration signal；It is to judge that obtaining load dynamic terminates after operating mode occurs with scanning that the load dynamic, which terminates operating mode duration,
The acquisition of load instruction, actual load, fuel command and natural fuel that cycle carries out and storage duration.It is also, steady with load
State operating mode starts the duration of operating mode for dynamic within 3 seconds after disappearing, therefore, the pulse width duration was no more than 3 seconds, usually
The correction value that the calorific value deviation that will be calculated can be completed in 2 scan periods as fuel static state feedforward amount stores simultaneously
It acts in unit cooperative control.And when the scan period is 0.5 second, 3 seconds are 6 scan periods.
Judge after load dynamic starts operating mode pulse width duration signal：When load changing rate is less than 2MW/min
When terminate operating mode for load dynamic and start；The operating mode starts between dynamic between steady state condition.
However, the duration of load steady state condition is a kind of variable, fuel heat is carried out after judging that load steady state condition occurs
It is worth the calculating of deviation, however calculates and be not over, load steady state condition finishes at this time, therefore, the method is further included：
The calculating of fuel value deviation is not over after the load steady state condition, and the load dynamic starts operating mode duration
Pulse width duration signal is sent after waiting the calculating of fuel value deviation.
Wherein：
In embodiment：The method is further included：When the load stable state run within the scan period does not occur, sweeping
It is stored before retouching end cycle using the preceding calorific value deviation once stored as the correction value of scan period fuel static state feedforward amount
And it acts in unit cooperative control.
In embodiment：The calorific value deviation value calculating method is：{（Current steady state fuel-upper bistable design calorific value combustion
Material）÷ (current steady state designs combustion value fuel-last moment bistable design combustion value fuel) } ÷ load variations amounts；
Wherein design combustion value fuel has fired power generating unit thermodynamic property to determine with the intrinsic relation of load.Different unit design heat
It is worth fuel and load relation is different, refers specifically to the relation between load and design combustion value fuel in unit running process
（How many loads correspond to how many design combustion value fuels）.
It is as shown in the table：
x（Load percentage %）： 0 25.7 44.3 53.0 65.2 76.5 100 110
y（Design combustion value fuel %）：0 28.1 46.2 54.8 66.8 77.7 100 100
Therefore, the combustion value fuel that designs is from the design combustion value fuel in thermal power unit boiler specification and load relation
It is obtained in chart.
In embodiment：The scattered control system scan period is not more than 500ms.
Wherein：As shown in Figure 1, the method flow is：Information merges and processing gathers main air pressure, actual negative in real time
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 dynamic starts
Fuel deviation signal is sent by discrete processes to fuel static state feedforward amount and therrmodynamic system control object, and by load and fuel
Storage unit is sent into instruction；Load and fuel command are sent into storage unit in case steady state condition tune again at the end of dynamic
With.In steady state condition, the load and fuel signal at two stable state moment in storage unit are called first, and it is inclined to carry out fuel value
The calculating of difference signal, calculation are：{（Current steady state fuel-upper bistable design combustion value fuel）(current steady state designs ÷
Combustion value fuel-last moment bistable design combustion value fuel) } ÷ load variations amounts.Then the fuel value deviation after calculating is believed
It number stores to temporary location, is called when dynamic operation condition.Due to unit in actual operation, dynamic operation condition and steady state condition can not
It is disconnected to be alternately present, therefore the algorithm can cycle progress therewith, realize loop iteration correction.
Above-described embodiment includes data acquisition, algorithm is implemented and three layers of Xun Huan correction.Involved mainly thermal motor
The fuel correction of group and the algorithm based on DCS platforms are realized.
The implementation of above-described embodiment is to remove meter of the control containing DCS system by the computer workstation with analysis program
Machine controller is calculated, controller converts digital signals into after analog signal and connects feeder rotational speed regulation by output control circuit
Device.
Be understood more readily from for this method be：1. pass through sound state during real-time circulation acquisition thermal power unit operation
Load and fuel are in the order of static state-dynamic-static by acquired data storage to algorithm unit according to load.2. with reference to fire
The intrinsic relation of motor group fuel design calorific value and load calculates Current fuel calorific value and designs the deviation of calorific value, which is
The correction value of next dynamic operation condition fuel value；3. under load dynamic operation condition, the deviation action calculated is controlled to coordination
In system in the static feed forward variable of fuel adjusting, treat that next steady state load operating mode occurs, repeat 1. and 2. the method with reality
The quick real time correction of existing fuel value.
In embodiment：Using load, fuel and main steam pressure as basis for estimation, when load changing rate be less than 2MW/min,
When rate of fuel change is less than 5t/h/min, main steam pressure change rate is less than 0.3MPa/min, unit is judged for steady state condition, it is no
Then unit is dynamic operation condition, is dynamic beginning operating mode according to load instruction judgement in dynamic operation condition or dynamically terminates operating mode,
Wherein：The correction value of fuel static state feedforward amount is acted in unit cooperative control and starts operating mode as dynamic, will realize load
Instruction, the acquisition of actual load, fuel command and natural fuel terminate operating mode with storage as dynamic.
Claims (9)
1. a kind of fast fuel calorific value bearing calibration applied to fired power generating unit, the control system of the fired power generating unit is fixed for Xun Huan
The scattered control system of phase scanning, which is characterized in that the bearing calibration is：In units of the scattered control system scan period,
The appearance of real-time judge unit load steady state condition, sequentially followed therewith after load steady state condition occur load dynamic open
Beginning operating mode and load dynamic terminate operating mode, and terminating operating mode in load dynamic carries out load instruction, actual load, fuel command and reality
The acquisition and storage of border fuel；The calculating of fuel value deviation is carried out after the appearance of load steady state condition；The calorific value being calculated
Correction value of the deviation as fuel static state feedforward amount in load dynamic beginning operating mode stores and acts on unit cooperative control
In, the static feedforward of fuel switchs to closed-loop control by original opened loop control and realizes the closed-loop corrected of fuel value deviation.
2. bearing calibration according to claim 1, which is characterized in that it is in load stable state that load dynamic, which starts operating mode duration,
The pulse width duration signal sent after operating mode；It is to judge to obtain load dynamic that load dynamic, which terminates operating mode duration,
Terminate the acquisition of the load instruction, actual load, fuel command and the natural fuel that are carried out after operating mode occurs with the scan period with depositing
Store up duration.
3. bearing calibration according to claim 2, which is characterized in that the pulse width duration is not more than 3 seconds.
4. bearing calibration according to claim 2, which is characterized in that the method is further included：It is opened in load dynamic
Judge after beginning operating mode pulse width duration signal：It is that load dynamic terminates when load changing rate is less than 2MW/min
Operating mode starts.
5. bearing calibration according to claim 2, which is characterized in that the method is further included：When the load is steady
The calculating of fuel value deviation is not over after state operating mode, and the load dynamic starts the pulse width duration of operating mode duration
Signal is sent after waiting the calculating of fuel value deviation.
6. bearing calibration according to claim 1 or 2, which is characterized in that load steady state condition judgement is：With negative
Lotus, fuel, main steam pressure be basis for estimation, when load changing rate be less than 2MW/min, rate of fuel change be less than 5t/h/min,
When main steam pressure change rate is less than 0.3MPa/min, judge unit for steady state condition.
7. bearing calibration according to claim 1 or 2, which is characterized in that the method is further included：When in scanning week
When the load stable state of operation does not occur in phase, using the preceding calorific value deviation once stored as scanning week before terminating in the scan period
The correction value of phase fuel static state feedforward amount is stored and acted in unit cooperative control.
8. bearing calibration according to claim 1 or 2, which is characterized in that the calorific value deviation value calculating method is：{（When
Presteady state fuel-upper bistable design combustion value fuel）÷ (current steady state design combustion value fuels-last moment bistable design heat
It is worth fuel) } ÷ load variations amounts；
Wherein：The combustion value fuel that designs is from the design combustion value fuel in thermal power unit boiler specification and load relationship graph
Middle acquisition.
9. bearing calibration according to claim 1 or 2, which is characterized in that the scattered control system scan period is little
In 500ms.
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| CN106773669B (en) * | 2016-11-21 | 2019-11-05 | 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 |
| CN107906499B (en) * | 2017-10-09 | 2019-03-26 | 李吉宁 | Fired power generating unit intelligence control system |
| CN108052007B (en) * | 2017-12-18 | 2020-08-25 | 华润电力湖北有限公司 | Thermal power generating unit operation optimization method, device and equipment and computer storage medium |
| 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 |
| 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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