CN106123005B - The coal-supplying amount pre-control method of coal unit boiler feed-forward - Google Patents
The coal-supplying amount pre-control method of coal unit boiler feed-forward Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 18
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- 230000008929 regeneration Effects 0.000 claims abstract description 9
- 238000011069 regeneration method Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 230000001960 triggered effect Effects 0.000 claims abstract description 4
- 238000011084 recovery Methods 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 4
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- 235000013399 edible fruits Nutrition 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
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- 238000005457 optimization Methods 0.000 abstract description 2
- 238000013507 mapping Methods 0.000 description 9
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- 230000033228 biological regulation Effects 0.000 description 4
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- 238000004519 manufacturing process Methods 0.000 description 3
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- 238000001816 cooling Methods 0.000 description 2
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- 235000019738 Limestone Nutrition 0.000 description 1
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- 230000001788 irregular Effects 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/002—Regulating fuel supply using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/34—Signal processing; Details thereof with feedforward processing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/02—Solid fuels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2241/00—Applications
- F23N2241/10—Generating vapour
Abstract
The present invention relates to control system boiler feed-forward control technology field is adjusted, it is a kind of coal-supplying amount pre-control method of coal unit boiler feed-forward, comprises the following steps：The first step, load carries out signal triggering, second step, load carry out signal trigger pulse, the 3rd step, in during pulse, T2 output deposit In2, the 4th step, T3 are exported to In1, output to rate limit blocks input after In1 is multiplied with In2,5th step, it is pre- to add and subtract coal regeneration rate control implementation process, the 6th step, when T4, T5 are not triggered, definite value A is the regeneration rate of pre- plus-minus back segment, and the 7th step, T6, T7 are that pulse signal triggering when load is carried out switches to speed B, T6 output controls limit fall off rate value, T7 output controls limitation climbing speed value.Predetermined coal-supplying amount in advance during load change big by coal unit of the invention, load change and fast and stable control main steam pressure, improve and coordinate control performance, obtain the effect of optimization.
Description
Technical field
It is a kind of coal unit boiler feed-forward to coal the present invention relates to control system boiler feed-forward control technology field is adjusted
Measure pre-control method.
Background technology
It is to coordinate control unit load and main steam pressure for coal fired power generation unit coordinatedcontrol system main task
Two parameters of power.The former is directly contacted with unit frequency modulation peak regulation, and load variations are made in time according to power network demand；The latter is related to
Stable operation of the boiler, the means for controlling main steam pressure are mainly Limestone control, because the energy conversion link of boiler oil
More, process complexity, has big inertia, long time delay characteristic, and its control mode is controlled by boiler coordination PID and attached more feedforwards
System, feedforward control play the predicting function of relevant parameter change, and using adjusting, the fuel quantity that good parameter calculates is directly folded
It is added in boiler and coordinates PID outputs, completion coal-supplying amount is opened before main steam pressure is reacted to PID input deviations and changes output bias
Ring pre-adjustment, unit is set to possess faster regulations speed.
Current coal unit boiler feed-forward includes：Actual load instructs（LDC）Function, the pre- add-subtract control of coal-supplying amount, drum
Pressure differential（Once-through Boiler without）, main steam pressure deviation differential, main steam pressure setting differential.Wherein by reaching target in advance
Load coal-supplying amount adds the pre- add-subtract control feedforward of coal-supplying amount, can carried out in unit to adapt to the fast-changing requirement of load
The starting point of load variations just carries out significantly coal-supplying amount in boiler master PID outputs in advance according to the change size of target load
Increase or decrease, and finally recover to 0 after being kept for a period of time.
Existing coal-supplying amount pre-control technical scheme is by target load instruction and actual negative after load carries out signal triggering
The difference of lotus and 0 switching, data respectively enter the input of two functions after switching selection, and one is used to control pulse duration, separately
One is used to control pre- plus-minus coal-supplying amount size, and load carries out the pulse signal that signal triggers the variable duration of the former imparting, arteries and veins
Select the coal-supplying amount size that defines of the latter to export to boiler master with faster rate during punching to feedover, when pulse duration terminates, again
Recovered with slow rate to 0, realize the pre- add-subtract control of coal-supplying amount.
Prior art shortcoming be mainly this feedforward action add and subtract in advance recover after coal-supplying amount to 0 speed be it is fixed, only
Main steam pressure is adjusted by boiler master PID closed loops to offset the disturbance of recovery process, the master with direct controlled device boiler
Steam pressure does not establish any control contact.There is the same of downward trend with main steam pressure there is controlled volume unit load
When, the feedforward action is still recovered with fixed rate descent direction, then needs boiler master PID to carry out the feedforward of this part of closed loop compensation anti-
Actuating quantity, makes the feedforward action turn into new interference volume, and increase boiler master PID reduces machine to main steam pressure regulating time
Group load and main steam pressure control precision and coordination control performance.
Another shortcoming be this feedforward action add and subtract in advance coal-supplying amount size be it is fixed, can not adaptive coal burning caloricity
Change.Power plant soot caloric value is one and does not fix irregular change, when it changes, coal amount needed for unit power
Size changes therewith, and now, fixed pre- plus-minus coal-supplying amount can not reach the amount of requirement, can only pass through boiler PID closed loop compensations
This part coal-supplying amount, increase is so adjusted into process time, reduce and coordinate control performance.
The content of the invention
The invention provides a kind of coal-supplying amount pre-control method of coal unit boiler feed-forward, above-mentioned prior art is overcome
Deficiency, its can effectively solve the problems, such as the dynamic deviation of main steam pressure in the prior art and load and respective setting value and
The unmatched problem of coal-supplying amount is added and subtracted caused by coal varitation in advance.
The technical scheme is that realized by following measures：A kind of above-mentioned coal unit boiler feed-forward gives coal
Pre-control method is measured, is comprised the following steps：
The first step, load carry out signal triggering：Controlled by the difference of target load instruction and actual load and 0 handover module T1
System, data respectively enter pulse duration control function f after switching selection1(x), pre-control coal-supplying amount function f2(x) input；
Second step, load carry out signal trigger pulse：f1(x) output data is used to control pulse duration, pulse signal point
Do not export to three data switching modules T2, T6, T7 and NOT gate；
3rd step, interior during pulse, T2 is exported by control pre-control coal-supplying amount function f2(x) output switching is to 0, T2
Output deposit In2；
4th step, total fuel quantity is with actual load ratio through work(- coal than correction function f3(x) correction factor is exported to switching
Module T3, T3 are exported to In1, and output to rate limit blocks input after In1 is multiplied with In2；
5th step, it is pre- to add and subtract coal regeneration rate control implementation process：Boiler main steam pressure passes through rate calculations function f4
(x) its rate of change, rate calculations function f are tried to achieve4(x) export
Wherein In (t) is current input value, and In (t-1) is the input value of last scan period, when Stime is the scan period
Between (s)；
Illustrate that its is on the rise when rate of change is more than 0.0002MPa/s, and non-with the AND burst lengths is pre-add behind the door
Subtract coal amount and enter Restoration stage, then data switching module T5 switches to 0, and coal-supplying amount subtracts backward plus side in advance when realizing locking load shedding
To the control of recovery, continue to recover with speed A after pressure does not have ascendant trend, exported by T7 to rate limit blocks make it is pre-
The climbing speed for subtracting coal recovery is limited to 0, and coal-supplying amount subtracts the control that backward plus direction is recovered in advance when realizing locking load shedding, works as pressure
Power continues to recover with speed A after not having ascendant trend；
When the main steam pressure rate of change tried to achieve in real time illustrates that it has a downward trend less than -0.0002MPa/s, and with
The AND burst lengths, non-plus-minus coal amount i.e. pre- behind the door entered Restoration stage, then data switching module T4 switches to 0, is exported by T6
The fall off rate for recovering pre- coal to rate limit blocks is limited to 0, and coal-supplying amount pre-add subtracts backward when realizing locking application of load
The control that direction is recovered, continue to recover with speed A after pressure does not have downward trend；
6th step, when data switching module T4, data switching module T5 are not triggered, definite value A is the extensive of pre- plus-minus back segment
Complex-velocity rate；
7th step, pulse signal triggering when T6, T7 are carried out through load switch to speed B, and definite value B is the quick pre-add of starting
The generation rate subtracted, T6 output controls limitation fall off rate value, T7 output controls limitation climbing speed value；
8th step, T6 output controls are limited fall off rate value by rate limit blocks, T7 output controls limit climbing speed
After output valve carries out Macro or mass analysis after value and In1 are multiplied with In2, exported to pre- plus-minus coal control instruction and obtained with the speed of change
Go out result.
The present invention coordinates control feedforward coal-supplying amount control logic during varying duty by changing in control system, can
Varying duty process main steam pressure and spatial load forecasting speed are improved, reduces main steam pressure and load and the dynamic of respective setting value
Deviation.By increasing ature of coal correction function, the pre- plus-minus unmatched problem of coal-supplying amount caused by solving coal varitation, pre-add is improved
Subtract adaptivity of the coal amount in coal varitation.Predetermined coal-supplying amount in advance during load change big by coal unit of the invention,
Load change and fast and stable control main steam pressure, improve and coordinate control performance, obtain the effect of optimization.
Brief description of the drawings
Accompanying drawing 1 is the method flow diagram of the embodiment of the present invention 1.
Embodiment
The present invention is not limited by following embodiments, can technique according to the invention scheme and actual conditions it is specific to determine
Embodiment.
In the present invention, for the ease of description, the description of the relative position relation of each part is according to Figure of description 1
Butut mode be described, such as：The position relationship of forward and backward, upper and lower, left and right etc. is the Butut according to Figure of description
Direction determines.
With reference to embodiment and accompanying drawing, the invention will be further described：
Embodiment 1：As shown in Figure 1, a kind of coal-supplying amount pre-control method of coal unit boiler feed-forward, including following step
Suddenly：
The first step, load carry out signal triggering：Controlled by the difference of target load instruction and actual load and 0 handover module T1
System, data respectively enter pulse duration control function f after switching selection1(x), pre-control coal-supplying amount function f2(x) input；
Second step, load carry out signal trigger pulse：f1(x) output data is used to control pulse duration, pulse signal point
Do not export to three data switching modules T2, T6, T7 and NOT gate；
3rd step, interior during pulse, T2 is exported by control pre-control coal-supplying amount function f2(x) output switching is to 0, T2
Output deposit In2；
4th step, total fuel quantity is with actual load ratio through work(- coal than correction function f3(x) correction factor is exported to switching
Module T3, T3 are exported to In1, and output to rate limit blocks input after In1 is multiplied with In2；
5th step, it is pre- to add and subtract coal regeneration rate control implementation process：Boiler main steam pressure passes through rate calculations function f4
(x) its rate of change, rate calculations function f are tried to achieve4(x) export
Wherein In (t) is current input value, and In (t-1) is the input value of last scan period, when Stime is the scan period
Between (s)；
Illustrate that its is on the rise when rate of change is more than 0.0002MPa/s, and non-with the AND burst lengths is pre-add behind the door
Subtract coal amount and enter Restoration stage, then data switching module T5 switches to 0, and coal-supplying amount subtracts backward plus side in advance when realizing locking load shedding
To the control of recovery, continue to recover with speed A after pressure does not have ascendant trend, exported by T7 to rate limit blocks make it is pre-
The climbing speed for subtracting coal recovery is limited to 0, and coal-supplying amount subtracts the control that backward plus direction is recovered in advance when realizing locking load shedding, works as pressure
Power continues to recover with speed A after not having ascendant trend；
When the main steam pressure rate of change tried to achieve in real time illustrates that it has a downward trend less than -0.0002MPa/s, and with
The AND burst lengths, non-plus-minus coal amount i.e. pre- behind the door entered Restoration stage, then data switching module T4 switches to 0, is exported by T6
The fall off rate for recovering pre- coal to rate limit blocks is limited to 0, and coal-supplying amount pre-add subtracts backward when realizing locking application of load
The control that direction is recovered, continue to recover with speed A after pressure does not have downward trend；
6th step, when data switching module T4, data switching module T5 are not triggered, definite value A is the extensive of pre- plus-minus back segment
Complex-velocity rate；
7th step, pulse signal triggering when T6, T7 are carried out through load switch to speed B, and definite value B is the quick pre-add of starting
The generation rate subtracted, T6 output controls limitation fall off rate value, T7 output controls limitation climbing speed value；
8th step, T6 output controls are limited fall off rate value by rate limit blocks, T7 output controls limit climbing speed
After output valve carries out Macro or mass analysis after value and In1 are multiplied with In2, exported to pre- plus-minus coal control instruction and obtained with the speed of change
Go out result.
The switching lock-in control logic can be recovered within the period not adjusted reversely, the feedforward action is not done
The regulation of boiler master PID control is disturbed, shortens main steam pressure regulation stabilization time, and then improve varying duty process main steam pressure
And spatial load forecasting speed, rate of change monitoring adjustment so can reduce main steam pressure and load and the dynamic of respective setting value
Deviation.
As shown in Figure 1, in the 4th step, work(- coal is than correction function f3(x) can compensate for caused by coal varitation
Coal amount differentiation gives, and possesses the capability for correcting of pre- plus-minus coal-supplying amount.
As shown in Figure 1, in the 5th step, while completing quick pre- plus-minus coal-supplying amount generating loop, according to speedometer
Calculate function f4(x) the main steam rate of change size of output and its selection using more switching combining modules, recover in pre- plus-minus
Stage control regeneration rate, reach the purpose for recovering pre- plus-minus coal amount according to main steam pressure Long-term change trend unperturbed at this stage,
Boiler master PID is not given reversely to adjust.
Embodiment 2：As shown in table 1,2,3, below by taking the subcritical drum boiler units of 300MW as an example, introduce function parameter and set
Put：
Unit relevant device overview：Unit rated power is 300MW, and boiler is east boiler（Group）Limited company
The coal-fired, subcritical of production, Natural Circulation, single drum, single burner hearth, corner tangential firing, a resuperheat, balanced draft,
Closed seal, all steel framework, dry ash extraction, coal-powder boiler.Steam turbine manufactures for Dongfang Turbine Co., Ltd., Dongfang Electric Group
A subcritical, resuperheat, HP-IP combined casing, single shaft twin-cylinder double flow, heat supply indirect air cooling steam turbine.
As shown in table 1, pulse duration control function f1(x) input (In) is target and actual load deviation (MW), is exported
(Out) it is pre- plus-minus coal amount burst length (s)；
As shown in table 2, pre-control coal-supplying amount function f2(x) input (In) is target and actual load deviation (MW), is exported
(Out) it is pre- plus-minus coal-supplying amount (t/h)；
As shown in table 3, work(- coal is than correction function f3(x) it is work(coal ratio to input (In), and output (Out) is repaiied for pre- plus-minus coal
Positive coefficient；
As shown in Figure 1, rate calculations function f4(x) export
Wherein In (t) is current input value, and In (t-1) is the input value of last scan period, when Stime is the scan period
Between (s).
As shown in Figure 1, described generation rate A=40.0 (t/h)/min;Regeneration rate B=4.0 (t/h)/min.
Embodiment 3：As shown in table 4,5,6, by taking 350MW supercritical DC furnace units as an example, the parameter setting of function is introduced：
Unit relevant device overview：Unit capacity is 350MW, and boiler is Harbin Boiler Co., Ltd.'s production
Single burner hearth, balanced draft, dry ash extraction, all steel frame, full overhung construction, π types, closed seal arrangement, a resuperheat, super face
Boundary's pressure variable-pressure operation, the direct current cooker using the atmosphere flash-off start-up system without recirculation pump.Steam turbine is east vapour
The overcritical of turbine Co., Ltd manufacture, a resuperheat, indirect air cooling twin-cylinder double flow condensing turbine.
As shown in table 4, pulse duration control function f1(x) input (In) is target and actual load deviation (MW), is exported
(Out) it is pre- plus-minus coal amount burst length (s)：
As shown in table 5, pre-control coal-supplying amount function f2(x) input (In) is target and actual load deviation (MW), is exported
(Out) it is pre- plus-minus coal-supplying amount (t/h)
As shown in table 6, work(- coal is than correction function f3(x) it is work(coal ratio to input (In), and output (Out) is repaiied for pre- plus-minus coal
Positive coefficient:
As shown in Figure 1, rate calculations function f4(x) formula is same as above.
As shown in Figure 1, described generation rate A=30.0 (t/h)/min;Regeneration rate B=5.0 (t/h)/min.
Embodiment 4：Example introduces the parameter setting of function by taking 660MW supercritical DC furnace units as an example：
Unit relevant device overview：Unit capacity is 660MW, and boiler is produced by Shanghai Electric Group Co., Ltd
An overcritical, resuperheat, quadrangle tangential circle tangential firing, balanced draft, closed seal, dry ash extraction, all steel framework direct current
Pulverized-coal fired boiler.Steam turbine is produced by Dongfan Steam Turbine Factory, model is overcritical, a resuperheat, single shaft, the steam discharge of three cylinder four,
Condensing turbine.
As shown in table 7, pulse duration control function f1(x) input (In) is target and actual load deviation (MW), is exported
(Out) it is pre- plus-minus coal amount burst length (s)；
As shown in table 8, pre-control coal-supplying amount function f2(x) input (In) is target and actual load deviation (MW), is exported
(Out) it is pre- plus-minus coal-supplying amount (t/h)；
As shown in table 9, work(- coal is than correction function f3(x) it is work(coal ratio to input (In), and output (Out) is repaiied for pre- plus-minus coal
Positive coefficient；
As shown in Figure 1, rate calculations function f4(x) formula is same as above.
As shown in Figure 1, described generation rate A=50.0 (t/h)/min;Regeneration rate B=6.0 (t/h)/min.
Above technical characteristic constitutes embodiments of the invention, and it has stronger adaptability and implementation result, can basis
The non-essential technical characteristic of increase and decrease is actually needed, to meet the needs of different situations.
Table 1 is 300MW unit pulse duration control functions f1(x) polygronal function mapping table
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
| IN(MW) | -200.0 | -50.0 | -10.0 | -5.0 | -3.0 | 3.0 | 5.0 | 10.0 | 50.0 | 200.0 |
| OUT(s) | 300.0 | 300.0 | 60.0 | 30.0 | 0.0 | 0.0 | 30.0 | 60.0 | 300.0 | 300.0 |
Table 2 is 300MW unit pre-control coal-supplying amount functions f2(x) polygronal function mapping table
| 1 | 2 | 3 | 4 | 7 | 8 | |
| IN(MW) | -200.0 | -50.0 | -3.0 | -3.0 | 50.0 | 200.0 |
| OUT(t/h) | -20 | -20 | 0.0 | 0.0 | 20.0 | 20.0 |
Table 3 is 300MW units work(- coal than correction function f3(x) polygronal function mapping table
| 1 | 2 | 3 | 4 | 5 | |
| IN((t/h)/MW) | 0 | 0.4 | 0.6 | 0.7 | 0.8 |
| OUT | 0.85 | 0.85 | 1.0 | 1.1 | 1.12 |
Table 4 is 350MW unit pulse duration control functions f1(x) polygronal function mapping table
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
| IN(MW) | -200.0 | -50.0 | -10.0 | -5.0 | -3.0 | 3.0 | 5.0 | 10.0 | 50.0 | 200.0 |
| OUT(s) | 65.0 | 65.0 | 30.0 | 15.0 | 0.0 | 0.0 | 15.0 | 30.0 | 65.0 | 65.0 |
Table 5 is 350MW unit pre-control coal-supplying amount functions f2(x) polygronal function mapping table
| 1 | 2 | 3 | 4 | 7 | 8 | |
| IN(MW) | -200.0 | -60.0 | -5.0 | -5.0 | 60.0 | 200.0 |
| OUT(t/h) | -12.8 | -12.8 | 0.0 | 0.0 | 12.8 | 12.8 |
Table 6 is 350MW units work(- coal than correction function f3(x) polygronal function mapping table
| 1 | 2 | 3 | 4 | 5 | |
| IN((t/h)/MW) | 0 | 0.5 | 0.6 | 0.7 | 0.8 |
| OUT | 0.88 | 0.95 | 1.0 | 1.05 | 1.10 |
Table 7 is 660MW unit pulse duration control functions f1(x) polygronal function mapping table
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
| IN(MW) | -200.0 | -60.0 | -40.0 | -20.0 | -8.0 | 8.0 | 20.0 | 40.0 | 60.0 | 200.0 |
| OUT(s) | 60.0 | 60.0 | 40.0 | 30.0 | 0.0 | 0.0 | 30.0 | 40.0 | 60.0 | 60.0 |
Table 8 is 660MW unit pre-control coal-supplying amount functions f2(x) polygronal function mapping table
| 1 | 2 | 3 | 4 | 7 | 8 | |
| IN(MW) | -200.0 | -100.0 | -5.0 | -5.0 | 100.0 | 200.0 |
| OUT(t/h) | -26.0 | -26.8 | 0.0 | 0.0 | 26.8 | 26.8 |
Table 9 is 660MW units work(- coal than correction function f3(x) polygronal function mapping table
| 1 | 2 | 3 | 4 | 5 | |
| IN((t/h)/MW) | 0 | 0.5 | 0.6 | 0.7 | 0.8 |
| OUT | 0.86 | 0.93 | 1.0 | 1.06 | 1.11 |
Claims (1)
1. a kind of coal-supplying amount pre-control method of coal unit boiler feed-forward, it is characterised in that comprise the following steps：
The first step, load carry out signal triggering：Controlled by the difference of target load instruction and actual load and 0 handover module T1,
Data respectively enter pulse duration control function f after switching selection1(x), pre-control coal-supplying amount function f2(x) input；
Second step, load carry out signal trigger pulse：f1(x) output data is used to control pulse duration, and pulse signal exports respectively
To three data switching modules T2, T6, T7 and NOT gate；
3rd step, interior during pulse, T2 is exported by control pre-control coal-supplying amount function f2(x) output switching to 0, T2 export
It is stored in In2；
4th step, total fuel quantity is with actual load ratio through work(- coal than correction function f3(x) correction factor is exported to handover module
T3, T3 are exported to In1, and output to rate limit blocks input after In1 is multiplied with In2；
5th step, it is pre- to add and subtract coal regeneration rate control implementation process：Boiler main steam pressure passes through rate calculations function f4(x) ask
Obtain its rate of change, rate calculations function f4(x) export
Wherein In (t) is current input value, and In (t-1) is the input value of last scan period, and Stime is time scan period
(s)；
Illustrate that its is on the rise when rate of change is more than 0.0002MPa/s, and non-with the AND burst lengths is pre- plus-minus coal behind the door
Amount enters Restoration stage, then data switching module T5 switches to 0, and coal-supplying amount subtracts backward in advance when realizing locking load shedding plus direction is extensive
Multiple control, continue to recover with speed A after pressure does not have ascendant trend, exporting to rate limit blocks by T7 makes pre- to subtract coal
The climbing speed of recovery is limited to 0, and coal-supplying amount subtracts the control that backward plus direction is recovered in advance when realizing locking load shedding, when pressure does not have
Continue to recover with speed A after on the rise；
When the main steam pressure rate of change tried to achieve in real time illustrates that it has a downward trend less than -0.0002MPa/s, and with AND arteries and veins
Rush time non-coal amount of adding and subtracting in advance behind the door and enter Restoration stage, then data switching module T4 switches to 0, is exported by T6 to speed
The fall off rate that limitation module recovers pre- coal is limited to 0, and it is extensive to subtract direction backward for coal-supplying amount pre-add when realizing locking application of load
Multiple control, continue to recover with speed A after pressure does not have downward trend；
6th step, when data switching module T4, data switching module T5 are not triggered, definite value A is the recovery speed of pre- plus-minus back segment
Rate；
7th step, pulse signal triggering when T6, T7 are carried out through load switch to speed B, and definite value B startings are quickly added and subtracted in advance
Generation rate, T6 output controls limitation fall off rate value, T7 output controls limitation climbing speed value；
8th step, T6 output controls are limited fall off rate value by rate limit blocks, T7 output controls limit climbing speed value with
And In1 be multiplied with In2 after after output valve carries out Macro or mass analysis, exported with the speed of change to pre- plus-minus coal control instruction and draw knot
Fruit.
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| CN107747738A (en) * | 2017-09-26 | 2018-03-02 | 莫程 | Coal electricity generation boiler enters coal control system |
| CN109597301B (en) * | 2017-09-30 | 2021-11-16 | 上海梅山钢铁股份有限公司 | Main steam temperature optimization control method for coke dry quenching waste heat boiler |
| CN115826400A (en) * | 2020-11-03 | 2023-03-21 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Coal amount optimizing and predicting control method based on AGC optimization of thermal power plant |
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| CN112947335A (en) * | 2021-02-05 | 2021-06-11 | 吉林省电力科学研究院有限公司 | Method for improving stability of main steam pressure of thermal power generating unit coordinated control system |
| CN113391615B (en) * | 2021-05-10 | 2024-04-02 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Variable time pulse algorithm for probability statistics |
| CN114307627B (en) * | 2021-11-22 | 2023-06-20 | 华能山东发电有限公司白杨河发电厂 | Denitration adjusting method based on theoretical ammonia consumption |
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