CN104791754B - Supercritical or ultra-supercritical generating set variable-load overshoot control method - Google Patents
Supercritical or ultra-supercritical generating set variable-load overshoot control method Download PDFInfo
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- CN104791754B CN104791754B CN201410165967.5A CN201410165967A CN104791754B CN 104791754 B CN104791754 B CN 104791754B CN 201410165967 A CN201410165967 A CN 201410165967A CN 104791754 B CN104791754 B CN 104791754B
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Abstract
The invention relates to a supercritical or ultra-supercritical generating set variable-load overshoot control method. According to the method, water supply overshooting and coal quantity overshooting are conducted separately, and various overshoots are intelligently generated according to a state of the generating set before the load is varied. The control method particularly comprises the following steps that 1, comparison is conducted between a load command and a real load deviation, whether the deviation is larger than a first constant value is judged, if yes, water supply overshooting is triggered, and the overshoot adopts hierarchical control; 2, comparison is conducted between a real intermediate point enthalpy value and a preset value of the enthalpy value, whether the deviation is larger than a second constant value is judged, if yes, the coal quantity overshooting is triggered, and the overshoot adopts the hierarchical control. Compared with the prior art, by means of the supercritical or ultra-supercritical generating set variable-load overshoot control method, the various overshoots are intelligently generated according to the state of the generating set before the load is varied, and load control and steam temperature control of a turbine high-pressure control valve in sliding pressure operation are well achieved.
Description
Technical field
The present invention relates to overcritical or ultra supercritical unit automation field, especially relate to a kind of overcritical
Or ultra supercritical unit varying duty overshoot control method.
Background technology
Overcritical or ultra supercritical thermal power generation unit quantity is increasing, is increasingly becoming main force's machine of domestic electrical network
Group.The coordinated control mode of unit mostly using based on CBF (boiler tracking) or based on by the way of CTF (steam turbine tracking), in CBF
Boiler control vapour pressure under mode, steam turbine control load；And under CTF mode, boiler control load, steam turbine control vapour pressure.Due to dispatching of power netwoks
Fired power generating unit AGC is controlled and requires more and more higher, unit mainly adopts the control mode based on CBF, to accelerate load responding,
Improve spatial load forecasting precision.But this mode needs steam turbine pitch to be in throttle, and (when single valve is adjusted, all pitch will save
Stream；During order valve regulation, there is throttling in some pitch), sacrifice unit operation economy to meet AGC control requirement.For this
Part of generating units employs the mode of steam turbine pitch standard-sized sheet sliding pressure operation, does not directly participate in Load Regulation or vapour pressure in varying duty
Control, only to be responded the change of load instruction by boiler.Because the thermal inertia ratio of boiler is larger, if not adopting advanced control
Mode, then cannot meet the requirement to unit AGC varying duty performance for the dispatching of power netwoks.During varying duty, in order to make full use of
Or the accumulation of heat of release unit, need boiler combustion rate instruction overshoot to control, that is, during application of load, the coal water instruction in same ratio increases
Plus outer, need specified increase overshoot, terminate overshoot in varying duty and reset；On the contrary during load shedding, in same ratio
The instruction of coal water also additionally subtracts a little outside reducing more, and overshoot after varying duty terminates resets.Conventional overshoot mode is to follow load
The change of instruction is synchronous to increase or decrease the corresponding coal water yield, it is impossible to effectively in the case that steam turbine pitch is not involved in adjusting
Improve the load responding ability of unit.
Content of the invention
The purpose of the present invention is exactly to overcome the defect of above-mentioned prior art presence to provide a kind of overcritical or super
Critical generating set varying duty overshoot control method, feedwater and coal amount overshoot are separately carried out, according to the state of unit before varying duty
The different overshoot of intelligentized generation, are better achieved the load under turbine high-pressure governing valve sliding pressure operation and steam temperature control
System.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of overcritical or ultra supercritical unit varying duty overshoot control method will be it is characterised in that the method will be given
Water and coal amount overshoot are separately carried out, and produce different overshoot according to the condition intelligent of unit before varying duty, described
Control method specifically includes following steps：
1) load instruction is compared with actual load, judges whether its deviation is more than the first definite value, if yes trigger
Feedwater overshoot, overshoot adopts grading control；
2) actual intermediate point enthalpy and enthalpy setting value are compared, judge whether its deviation is more than the second definite value, if
It is yes, triggers coal amount overshoot, overshoot adopts grading control.
Described step 1) it is specially：
11) load instruction being compared with actual load, judging whether its deviation is more than the first definite value, if it is, holding
Row step 12), otherwise continue executing with step 11)；
12) judge whether this deviation is positive number, if it is, execution step 13), otherwise execution step 14)；
13) triggering positive feedwater overshoot for the first time, if deviation continues to increase, second positive feedwater overshoot of triggering, until
Deviation reduces, and after deviation reduces, carries out overshoot and progressively resets；
14) trigger the feedwater overshoot of first time negative sense, if deviation continues to reduce, second negative sense feedwater overshoot of triggering, until
Deviation increases, and after deviation increases, carries out overshoot and progressively resets.
Described feedwater overshoot is resetted using different speed from overshoot.
Described step 2) it is specially：
21) actual intermediate point enthalpy and enthalpy setting value are compared, judge whether its deviation is more than the second definite value, if
It is yes, execution step 22), otherwise continue executing with step 21)；
22) judge whether this deviation is positive number, if it is, execution step 23), otherwise execution step 24)；
23) trigger first time negative sense coal amount overshoot, if deviation continues to increase, trigger second negative sense coal amount overshoot, until
Deviation reduces, and after deviation reduces, carries out overshoot and progressively resets；
24) triggering positive coal amount overshoot for the first time, if deviation continues to reduce, second positive coal amount overshoot of triggering, until
Deviation increases, and after deviation increases, carries out overshoot and progressively resets.
Described coal amount overshoot is resetted using different speed from overshoot.
Described actual intermediate point enthalpy exports enthalpy for steam-water separator.
Compared with prior art, after the present invention adopts above-mentioned overshoot technology, even if being not involved in bearing in steam turbine pitch standard-sized sheet
In the case that lotus is adjusted, unit actual load also can substantially be followed the change of AGC load instruction and be changed, and reach dispatching of power netwoks pair
The check requirements of AGC varying duty performance, also can meet the property to unit varying duty for the electrical network while realizing power unit in economic operation
Can require.
Brief description
Fig. 1 is the positive overshoot schematic diagram of application of load of the present invention feedwater；
Fig. 2 is enthalpy of the present invention higher coal amount negative sense overshoot schematic diagram；
Fig. 3 is that feedwater coal amount overshoot introduces position view；
Fig. 4 is the curve map of unit AGC instruction, load instruction and actual load under overshoot of the present invention.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
In order to reduce the restriction loss of turbine high-pressure governing valve, improve unit operation economy, employ turbine high-pressure
The mode of pitch standard-sized sheet sliding pressure operation, during varying duty, pitch is no longer participate in Load Regulation or Steam Pressure Control of Circulated, thus affecting
Unit varying duty performance.Conventional overshoot mode is that the change synchronization following load instruction increases or decreases corresponding coal water
Amount, it is impossible to effectively improve the load responding ability of unit in the case that steam turbine pitch is not involved in adjusting.For this reason, the present invention carries
Supply a kind of new varying duty overshoot control mode, to have made up due to the decline of pitch standard-sized sheet afterload changing capability.
, after entering DC state, evaporation capacity is equal to feedwater flow for overcritical or extra-supercritical unit, although during varying duty
Steam turbine pitch standard-sized sheet cannot change evaporation capacity by pitch, but evaporation capacity can be caused to change by changing feedwater flow,
Thus reaching the quick effect changing unit load.Therefore the present invention devises a kind of new overshoot method：I.e. when load instruction and
When actual load deviation is more than certain value, triggering feedwater overshoot, overshoot adopts grading control, and relevant with load deviation.When
When load instruction is more than actual load, need application of load, triggering feedwater overshoot increases a certain amount of feedwater, thus accordingly increase steaming
Send out amount so that unit load increases, when load deviation reduces, overshoot progressively resets；When load instruction is less than actual load
When, need load shedding, the negative overshoot of triggering feedwater reduces a certain amount of feedwater, thus accordingly reducing evaporation capacity so that unit load
Reduce, when load deviation reduces, overshoot progressively resets.
The overshoot of coal amount be not simple according to load instruction or load deviation, but using representing coal-water ratio relation and boiler
Intermediate point enthalpy (steam-water separator outlet enthalpy), the variation tendency according to enthalpy and the deviation with setting value of amount of stored heat change
Size triggering, so can the intelligentized accumulation of heat situation according to boiler before varying duty, come reasonable supplement or release accumulation of heat.When
Intermediate point enthalpy rise and higher than setting value when, triggering subtract coal amount overshoot, overshoot adopt classification process, enthalpy fall after rise after overshoot
Reset；When intermediate point enthalpy declines and is less than setting value, trigger coal amount overshoot, overshoot after enthalpy rises resets.
After such overshoot mode, even if in the case that steam turbine pitch standard-sized sheet is not involved in Load Regulation, unit
Actual load also can substantially be followed the change of AGC load instruction and be changed, and reach the examination to AGC varying duty performance for the dispatching of power netwoks
Require, also can meet the performance requirement to unit varying duty for the electrical network while realizing power unit in economic operation.
Carry out Logical Configuration in unit DCS control system, realize above-mentioned control function, specific embodiments are shown in Fig. 1-3,
Implementation result is shown in certain AGC testing load change curve (Fig. 4)
Fig. 1 represents feedwater overshoot during application of load.After load instruction is higher than actual load certain value, triggering is a certain amount of
Positive feedwater overshoot, after this deviation reduces, overshoot is replied, overshoot triggering and reply and adopt different speed.Overshoot is adopted
Processed with classification, that is, when load deviation continues to increase, original overshoot triggers new overshoot again, after deviation has reduced
Secondary overshoot resets.Feedwater overshoot during load shedding is similar to, and simply becomes negative sense overshoot and reduces confluent, and final synthesis is negative
Feedwater overshoot during lotus instruction change.
Coal-fired overshoot when Fig. 2 represents that enthalpy is higher.After actual enthalpy is higher than enthalpy setting value certain value, trigger one
Quantitative negative sense coal amount overshoot, that is, reduce a certain amount of fire coal, and after enthalpy deviation reduces, overshoot is replied, overshoot triggering with
Reply using different speed.Overshoot adopts classification to process, and that is, when enthalpy deviation continues to increase, touches again in original overshoot
The overshoot sending out new, deviation secondary overshoot reset after having reduced.Coal amount overshoot when enthalpy is low is similar to, and just simply becomes
Increase Coal-fired capacity, coal amount overshoot during final synthesis enthalpy change to overshoot.
Fig. 3 represents that feedwater, coal amount overshoot introduce position.Instructed by unit load and generate boiler master instruction, then warp respectively
Boiler master one feedwater function and boiler master one coal flow function generate feedwater, the master instruction of coal amount, and superposition overshoot respectively is formed
Final feedwater and the instruction of coal amount.
Fig. 4 represents under this overshoot mode, unit AGC varying duty curve, and analysis curve understands, in steam turbine high-pressure governing valve
In the case of standard-sized sheet sliding pressure operation, unit actual load can follow AGC instruction change, and speed reaches every point of dispatching of power netwoks requirement
Clock 1.5% rated load.
Claims (4)
1. a kind of overcritical or ultra supercritical unit varying duty overshoot control method will be it is characterised in that the method will feed water
Separately carry out with coal amount overshoot, and different overshoot are produced according to the condition intelligent of unit before varying duty, described control
Method processed specifically includes following steps：
1) load instruction is compared with actual load, judges whether its deviation is more than the first definite value, if yes triggering feedwater
Overshoot, overshoot adopts grading control；
2) actual intermediate point enthalpy and enthalpy setting value are compared, judge whether its deviation is more than the second definite value, if it is,
Triggering coal amount overshoot, overshoot adopts grading control；
Described step 1) it is specially：
11) load instruction being compared with actual load, judging whether its deviation is more than the first definite value, if it is, executing step
Rapid 12), otherwise continue executing with step 11)；
12) judge whether this deviation is positive number, if it is, execution step 13), otherwise execution step 14)；
13) triggering positive feedwater overshoot for the first time, if deviation continues to increase, second positive feedwater overshoot of triggering, until deviation
Reduce, after deviation reduces, carry out overshoot and progressively reset；
14) trigger the feedwater overshoot of first time negative sense, if deviation continues to reduce, second negative sense feedwater overshoot of triggering, until deviation
Increase, after deviation increases, carry out overshoot and progressively reset.
2. one kind according to claim 1 is overcritical or ultra supercritical unit varying duty overshoot control method, and it is special
Levy and be, described feedwater overshoot is resetted using different speed from overshoot.
3. one kind according to claim 1 is overcritical or ultra supercritical unit varying duty overshoot control method, and it is special
Levy and be, described step 2) it is specially：
21) actual intermediate point enthalpy and enthalpy setting value are compared, judge whether its deviation is more than the second definite value, if
It is, execution step 22), otherwise continue executing with step 21)；
22) judge whether this deviation is positive number, if it is, execution step 23), otherwise execution step 24)；
23) trigger first time negative sense coal amount overshoot, if deviation continues to increase, trigger second negative sense coal amount overshoot, until deviation
Reduce, after deviation reduces, carry out overshoot and progressively reset；
24) triggering positive coal amount overshoot for the first time, if deviation continues to reduce, second positive coal amount overshoot of triggering, until deviation
Increase, after deviation increases, carry out overshoot and progressively reset.
4. one kind according to claim 3 is overcritical or ultra supercritical unit varying duty overshoot control method, and it is special
Levy and be, described coal amount overshoot is resetted using different speed from overshoot.
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| CN107228380A (en) * | 2017-05-19 | 2017-10-03 | 中国神华能源股份有限公司 | The method and system for determining boiler heating parameters are instructed by generated output |
| CN111649313A (en) * | 2020-06-16 | 2020-09-11 | 上海明华电力科技有限公司 | Control method for inhibiting heat transfer deterioration of water-cooled wall of vertical tube coil of supercritical boiler |
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