CN101988697B - Intelligent coordinated control method for thermal power unit - Google Patents
Intelligent coordinated control method for thermal power unit Download PDFInfo
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- CN101988697B CN101988697B CN200910056125.5A CN200910056125A CN101988697B CN 101988697 B CN101988697 B CN 101988697B CN 200910056125 A CN200910056125 A CN 200910056125A CN 101988697 B CN101988697 B CN 101988697B
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Abstract
The invention provides an intelligent coordinated control method for a thermal power unit, which comprises the following steps: carrying out intelligent coordinated control on the unit; carrying out intelligent feed water control on a once-through boiler; carrying out intelligent fast reverse variable load processing; and carrying out intelligent overshoot control, wherein the intelligent overshoot control comprises the intelligent overshoot control of the once-through boiler and the intelligent overshoot control of a drum boiler. By improving the traditional coordinated control, the intelligent coordinated control method for the thermal power unit can improve the variable load performance of the unit, better meet the variable load requirement of a power grid, improve the stability and the economy during the operation of the unit, reduce the variable load cost of the unit and better coordinate interests of a factory and the power grid.
Description
Technical field
The present invention relates to the control technology field of thermal power plant, and be particularly related to the intelligentized control method for coordinating of a kind of fired power generating unit.
Background technology
Tradition coordinated control system mainly contains stove and follows stove (TF), coordinates (CC) three kinds of control modes with machine (BF), machine.As shown in Figure 1, BM is the instruction of controlling boiler combustion, and TM controls the instruction that steam turbine regulates porthole.
Work as K1=K4=1, during K2=K3=0, system is " stove is with machine (BF) " mode, now steam turbine pitch regulates the power of the assembling unit, and boiler combustion rate regulates vapour pressure, and this mode varying duty performance is good, but unit vapour pressure, steam temperature change greatly, and operation stability is poor, is conducive to electrical network.
Work as K1=K4=0, during K2=K3=1, system is " machine is with stove (TF) " mode, now steam turbine pitch regulates vapour pressure, and boiler combustion rate regulates the power of the assembling unit, this mode varying duty poor performance, but it is less that unit vapour pressure, steam temperature change, and good operation stability, is conducive to power plant.
General employing coordinated (CC) control mode at present, and now steam turbine pitch and boiler combustion rate regulate the comprehensive deviation of the power of the assembling unit and vapour pressure.The setting that K1～K4 is different, can produce different trade-off effects, and the large explanation steam turbine of K1/K2 stresses to regulate load, otherwise explanation steam turbine stresses to regulate main vapour pressure; The large explanation boiler side of K4/K3 is resetted and is saved main vapour pressure, the joint load otherwise explanation boiler side is resetted.Visible, TF and BF are two kinds of special situations.
No matter which kind of coordination mode, all designed the feedforward of load instruction to boiler instruction (BM), make boiler combustion rate correctly, with load instruction, change rapidly, because Boiler Steam thermic load is slower to fuel quantity response, when varying duty, boiler combustion rate should have suitable overshoot, accelerate on the one hand the varying duty speed of unit, the accumulation of heat that simultaneously compensates boiler changes.K5 is the variation of accelerating pitch during for varying duty, improves the adjusting function of the power of the assembling unit.
Along with the manufacturing great-leap-forward development of domestic electrical circuitry equipment, a large amount of 600MW and above grade supercritical unit are gone into operation, these units are all direct current cooker, because direct current cooker is without fixed limit between forced circulation and heated section, between parameter, have a large amount of coupling phenomenons, and the direct current cooker of supercritical parameter is larger because thermodynamic property within the scope of peak regulation changes, in the hysteresis that its dynamic characteristic shows, time, become and non-linear just stronger; Because super critical boiler accumulation of energy ability is relatively less, it is just more outstanding that generation load is controlled the contradiction of controlling with boiler parameter simultaneously.
The feedwater of drum boiler there is no impact to steam vapour pressure and temperature, unit generation power, so the coordinated control system of drum boiler unit can be simplified to boiler combustion rate and two inputs of steam turbine pitch, the object of the power of the assembling unit and two outputs of steam pressure.And the feedwater of Once-through Boiler has significant impact to steam vapour pressure and temperature, unit generation power merit, so it is a boiler combustion rate, confluent and three inputs of steam turbine pitch at least, the object of three outputs of the power of the assembling unit, steam pressure and temperature (or enthalpy).But supercritical unit is still being continued to use the traditional coordinated control system that is mainly applicable to drum boiler unit at present, is difficult to meet supercritical unit service requirement.
The boiler capacity of Once-through Boiler synchronously changes with confluent, controls feedwater and can change fast unit generation power.Steam temperature is also fast than fuel to the response of feedwater, the unit of especially joining unit pulverized-coal system, because raw coal is worn into the coal dust needs time of about 1 minute, combustion rate regulates steam temperature to have longer delay, so Once-through Boiler unit generally adopts feedwater to regulate separation temperature (or enthalpy) at present, during varying duty, in order to maintain steam temperature, the flue gas heat that requires feedwater to produce with boiler combustion synchronously changes, feedwater must lag behind fuel quantity variation, like this varying duty poor-performing of this class generating set.
Summary of the invention
The present invention proposes the intelligentized control method for coordinating of a kind of fired power generating unit, by being coordinated to control, tradition improves, improve the varying duty performance of unit, meet better the varying duty requirement of electrical network, improve stability and the economy of unit operation, reduce the varying duty cost of unit, coordinate better factory's net interests.
In order to achieve the above object, the present invention proposes the intelligentized control method for coordinating of a kind of fired power generating unit, comprising:
Carrying out intelligent coordination of unit controls;
Carry out Once-through Boiler intelligent to water management;
Carrying out intelligent snap back varying duty processes;
Carry out intelligent overshoot control, wherein said intelligent overshoot is controlled and is comprised the intelligent overshoot control of Once-through Boiler and the intelligent overshoot control of drum boiler.
Further, described unit is intelligent coordinates to be controlled in application of load process main vapour pressure lower than pressure definite value, as on the low side in permissible value, now steam turbine pitch regulates generated output, the power of the assembling unit equates substantially with power instruction, unit has best load adjustment ability, and the power of the assembling unit can be followed fast power instruction and be changed;
If main vapour pressure surpasses permissible value lower than pressure definite value, now steam turbine pitch has increased the regulating action of main vapour pressure, prevents that main vapour pressure is too low, now the power of the assembling unit can be lower than power instruction, if main vapour pressure continues to decline, answer locking steam turbine pitch to open greatly, guarantee unit safety.
Further, described unit is intelligent coordinates to be controlled in load shedding process main vapour pressure higher than pressure definite value, as higher in permissible value, now steam turbine pitch regulates generated output, the power of the assembling unit equates substantially with power instruction, unit has best load adjustment ability, and the power of the assembling unit can be followed fast power instruction and be changed;
If main vapour pressure surpasses permissible value higher than pressure definite value, now steam turbine pitch has increased the regulating action of main vapour pressure, prevents that main vapour pressure is too high, now the power of the assembling unit can be higher than power instruction, if main vapour pressure continues to rise, answer locking steam turbine pitch to turn down, guarantee unit safety.
Further, described intelligent Once through Boiler Feed is when varying duty, suitably abandon the control of steam temperature, assist control of steam turbine governing valve power, unit is had and continue preferably varying duty performance, complete after varying duty, feedwater is smoothly transitted into control steam temperature, so, improve the load adjustment ability of Once-through Boiler unit, the variation of steam temperature is also controlled in rational scope.
Further, in application of load process, feedwater increases in advance, steam temperature is lower than temperature definite value, as on the low side in separator temperature in permissible value, there will not be because steam temperature declines and reduce feedwater flow, make power of the assembling unit decline situation, now feedwater is mainly used in the auxiliary adjustment power of the assembling unit, unit is had and continue preferably application of load performance;
If separator temperature is on the low side, surpass permissible value, now feedwater recovers to regulate separator temperature, prevents that steam temperature is too low, guarantees unit safety, and application of load performance can decline to some extent.
Further, in load shedding process, feedwater reduces in advance, steam temperature is higher than temperature definite value, as higher in separator temperature in permissible value, there will not be because steam temperature rises and increase feedwater flow, make power of the assembling unit rising situation, now feedwater is mainly used in the auxiliary adjustment power of the assembling unit, unit is had and continue preferably load shedding performance;
If the higher permissible value that surpasses of separator temperature, now feedwater recovers to regulate separator temperature, prevents that steam temperature is too high, guarantees unit safety, and load shedding performance can decline to some extent.
Further, described intelligent snap back varying duty is processed in application of load process, as now there is suddenly reverse load shedding requirement, steam turbine group pitch changes towards the direction of closing fast, the feedwater of Once-through Boiler changes towards the direction reducing fast, the power of the assembling unit can require synchronous variation with electrical network, effectively improves the varying duty performance of unit.
Further, described intelligent snap back varying duty is processed suddenly reverse load shedding in application of load process, now the power of the assembling unit is lower than power instruction, main vapour pressure is lower than pressure definite value, steam turbine pitch becomes adjusting vapour pressure, pitch turns down fast, and varying duty speed is better than electrical network requirement, and helps vapour pressure recovery.
Further, described intelligent snap back varying duty is processed suddenly reverse load shedding in application of load process, and now Once-through Boiler steam temperature is lower than pressure definite value, feedwater becomes adjusting steam temperature, and confluent reduces, and accelerates the power of the assembling unit and declines, varying duty performance improves, and helps steam temperature recovery.
Further, when the intelligent overshoot of described Once-through Boiler has been controlled at application of load and has required, system triggers the overshoot of combustion rate and confluent, now because pitch is opened large application of load, and boiler heat load does not also have enough time to increase, and steam pressure and temperature decline, wherein overshoot is divided into two parts, coal water proportion relation is pressed with synchronous variation confluent and fuel quantity by first, and second portion is the independent overshoot of fuel quantity, is mainly used in recovering because feedwater changes the variations in temperature causing in advance;
System is according to the overshoot amplitude of the variation correction feedwater of steam temperature, vapour pressure and combustion rate, overshoot due to combustion rate and feedwater, in the later stage of application of load process, boiler heat can be greater than generated energy, steam pressure and temperature rise, and the first's overshoot that resets when steam pressure approaches its definite value, when vapor (steam) temperature approaches its definite value, the overshoot of reset second portion combustion rate, returns to desired value because boiler hot inertia finally makes steam pressure and temperature.
Further, when the intelligent overshoot of described drum boiler is controlled at application of load, pitch is opened greatly, utilizes the accumulation of heat of unit that electric load is increased fast, and main vapour pressure declines; The ground of the quick overshoot of boiler combustion rate simultaneously changes, and when boiler load surpasses electric load, main vapour pressure bottom out finishes overshoot when pressure gos up to approach its definite value, and main vapour pressure goes back up to its definite value by the inertia of boiler load.
The intelligentized control method for coordinating of fired power generating unit that the present invention proposes, making thermal power plant realize unit load by coordinated control system controls, coordinated control system is generally by regulating the adjusting porthole of boiler combustion rate (and confluent), steam turbine throttle flow, the load variations requirement of responsive electricity grid as early as possible under the prerequisite that guarantees unit safety, and maintain vapour pressure (steam temperature), make Unit Economic and stably operation.
Accompanying drawing explanation
Figure 1 shows that traditional coordinated control system schematic diagram.
Figure 2 shows that the intelligentized control method for coordinating flow chart of fired power generating unit of preferred embodiment of the present invention.
Figure 3 shows that the drum boiler intelligent coordinated control system schematic diagram of preferred embodiment of the present invention.
Figure 4 shows that the Once-through Boiler intelligent coordinated control system schematic diagram of preferred embodiment of the present invention.
The specific embodiment
In order more to understand technology contents of the present invention, especially exemplified by specific embodiment and coordinate appended graphic being described as follows.
Please refer to Fig. 2, Figure 2 shows that the intelligentized control method for coordinating flow chart of fired power generating unit of preferred embodiment of the present invention.The present invention proposes the intelligentized control method for coordinating of a kind of fired power generating unit, comprising:
Step S100: carry out intelligent coordination of unit and control;
Step S200: carry out Once-through Boiler intellectuality to water management;
Step S300: carry out intelligent snap back varying duty and process;
Step S400: carry out intelligent overshoot control, wherein said intelligent overshoot is controlled and comprised the intelligent overshoot control of Once-through Boiler and the intelligent overshoot control of drum boiler.
Current coordinated control system employing tradition is as shown in Figure 1 control mode fixedly, this intelligent coordinated control system is determined unit application of load, load shedding, is stablized three kinds of operating modes according to the variation of power instruction, unit switches to BF mode when varying load condition, now steam turbine pitch is guaranteeing power ratio control under the prerequisite of unit safety, give play to the fastest varying duty performance of unit, met in time the AGC varying duty requirement of electrical network.Complete the coordination mode that is transitioned into TF after varying duty or is conducive to unit, steam turbine pitch smoothly transition is the main vapour pressure that regulates, and makes unit under steady working condition, in stable, the most most economical method of operation.Realized preferably power plants and grid coordination.
As Fig. 3, the steam turbine pitch regulating system that PID1 forms is a rapid system, and making input deviation E1 is 0.By coordination mode control module, make E1 have different models, steam turbine pitch is born different adjusting tasks.
Symbol description:
N: the power of the assembling unit, N
0: power instruction, N
0i: power instruction during application of load, N
0d: load instruction during load shedding.
P
1: main vapour pressure; P
0: pressure definite value; P
0i: pressure definite value during application of load; P
0d: pressure definite value during load shedding, δ: the pressure divergence of permission.
Power instruction during application of load:
N
0i=MAX (N
0, N) formula 1
Pressure definite value during application of load:
P
0i=MAX[(P
0-δ), MIN (P
0, P
1)] formula 2
PID1 input deviation during application of load:
E1
i=(N
01-N)-K (P
0i-P
1) formula 3
Because the power of the assembling unit in application of load process is generally lower than power instruction, by formula 1, obtained: N
0i=N
0, main vapour pressure, generally lower than pressure definite value,, is obtained by formula 2: P as on the low side in permissible value
0i=P
1, by formula 3, obtained:
E1=(N
0-N) formula 4
From formula 4, now steam turbine pitch regulates generated output, the power of the assembling unit substantially to equate with power instruction, and unit has best load adjustment ability, and the power of the assembling unit can be followed fast power instruction and be changed, and this is situation normally in application of load process.
If main vapour pressure surpasses permissible value (δ) lower than pressure definite value, by formula 2, obtained: P
0i=P
0-δ, is obtained by formula 3:
E1=(N
0-N)-K (P
0-δ-P
1) formula 5
From formula 5, now steam turbine pitch has increased the regulating action of main vapour pressure, prevents that main vapour pressure is too low, and now the power of the assembling unit can be on the low side in power instruction, if main vapour pressure continues to decline, answers locking steam turbine pitch to open greatly, guarantees unit safety.
Power instruction during load shedding:
N
0d=MIN (N
0, N) formula 6
Pressure definite value during load shedding:
P
0d=MIN[(P
0+ δ), MAX (P
0, P
1)] formula 7
PID1 input deviation during load shedding:
E1
d=(N
0d-N)-K (P
0d-P
1) formula 8
Because generated output in load shedding process is generally higher than power instruction, by formula 6, obtained: N
0d=N
0, main vapour pressure, generally higher than pressure definite value,, is obtained by formula 7: P as higher in permissible value
0d=P
l, by formula 8, obtained:
E1=(N
0-N) formula 9
From formula 9, now steam turbine pitch regulates generated output, the power of the assembling unit substantially to equate with power instruction, and unit has best load adjustment ability, and the power of the assembling unit can be followed fast power instruction and be changed, and this is situation normally in load shedding process.
If main vapour pressure surpasses permissible value (δ) higher than pressure definite value, by formula 7, obtained: P
0d=P
0+ δ, is obtained by formula 8:
E1=(N
0-N)-K (P
0+ δ-P
1) formula 10
From formula 10, now steam turbine pitch has increased the regulating action of main vapour pressure, prevents that main vapour pressure is too high, and now the power of the assembling unit can be higher in power instruction, if main vapour pressure continues to rise, answers locking steam turbine pitch to turn down, and guarantees unit safety.
In varying duty process, boiler side PID2, does to change accordingly, and E2 is generally the deviation of main vapour pressure and pressure definite value.
From varying duty is transitioned into stable state, coordination mode switchback TF or more stable coordination mode.
Please refer to Fig. 4, supercritical unit does not have drum boiler large accumulation of heat like that, so power of the assembling unit variation is less when pitch changes, can only meet electrical network initial stage and varying duty requirement very by a small margin, can not meet by a relatively large margin lasting varying duty requirement.The boiler capacity of Once-through Boiler synchronously changes with confluent, controls feedwater and can change fast unit generation power, and this is also the main path that supercritical unit energy storage utilizes.Steam temperature is fast more than fuel to the response of feedwater, by feedwater, regulates load, and varying duty performance is good, but Temperature Deviation is larger, otherwise feedwater regulates steam temperature, and steam temperature changes less, but varying duty poor performance, it is contradictory that the load of visible Once-through Boiler unit is controlled with control of steam temperature.
This intelligent feed water control system is when varying duty, suitably abandon the control of steam temperature, assist control of steam turbine governing valve power, unit is had and continue preferably varying duty performance, complete after varying duty, feedwater is smoothly transitted into control steam temperature, so improves the load adjustment ability of supercritical unit, and the variation of steam temperature is also controlled in rational scope.
Symbol description:
T: separator temperature; T
0: temperature definite value; T
0i: temperature definite value during application of load; T
0d: temperature definite value during load shedding, σ: the temperature deviation of permission.
Temperature definite value during application of load:
T
0i=MAX[(T
0-σ), MIN (T
0, T)] and formula 11
Due to application of load process, feedwater increases in advance, and steam temperature generally meeting is lower than temperature definite value, as on the low side in separator temperature in permissible value, is obtained: T by formula 11
0i=T, PID3 is input as 0, there will not be because steam temperature declines and reduces feedwater flow, makes power of the assembling unit decline situation, and now feedwater is mainly used in the auxiliary adjustment power of the assembling unit, unit is had and continue preferably varying duty performance.If separator temperature is on the low side, surpass permissible value, by formula 11, obtained: T
0i=T
0-σ, now feedwater recovers to regulate separator temperature, prevents that steam temperature is too low, guarantees unit safety, and varying duty performance can decline to some extent.
Temperature definite value during load shedding:
T
0d=MIN[(T
0+ σ), MAX (T
0, T)] and formula 12
Same load shedding process, feedwater reduces in advance, and steam temperature generally meeting is higher than temperature definite value, as higher in separator temperature in permissible value, is obtained: T by formula 12
0d=T, PID3 is input as 0, there will not be because steam temperature rises and increases feedwater flow, makes power of the assembling unit rising situation, and now feedwater is mainly used in the auxiliary adjustment power of the assembling unit, unit is had and continue preferably varying duty performance.If the higher permissible value that surpasses of separator temperature, is obtained by formula 12: T
0i=T
0+ σ, now feedwater recovers to regulate separator temperature, prevents that steam temperature is too high, guarantees unit safety, and varying duty performance can decline to some extent.
One, electrical network requires the system of generating and the timely balance of electricity consumption, often there will be up and down varying duty requirement back and forth, and this patent has the power of the assembling unit made from the function of electrical network requirement snap back varying duty.
In application of load process, as now there is suddenly reverse load shedding requirement, under current coordinated control system, because power instruction has rate limit, within a period of time, the power of the assembling unit is still lower than power instruction, so steam turbine pitch can change towards holding general orientation, the delay that causes reversal of load to change, also wastes power generation energy resource.In this patent, occur, by adding when turning the varying duty subtracting and requiring, by formula 6, being obtained: N
0=N, PID1 power instruction is by N
0become N, steam turbine group pitch changes towards the direction of closing fast.The visible power of the assembling unit can require synchronous variation with electrical network, has effectively improved the varying duty performance of unit.
While often there will be application of load in varying duty process frequently main vapour pressure higher during in its definite value and load shedding main vapour pressure on the low side in its definite value; as suddenly reverse load shedding in application of load process; now not only the power of the assembling unit lower than power instruction; and main vapour pressure is also lower than pressure definite value, by formula 6,7,, 8 obtain: E1=K (P
0-P
1), steam turbine pitch becomes adjusting vapour pressure, and pitch turns down fast, and varying duty speed can be better than electrical network requirement, and it is all favourable doing like this electrical network and unit, because now pitch varying duty is consistent with the direction of recovering main vapour pressure.
When in the time of equally in varying duty process frequently, Once-through Boiler often there will be application of load steam temperature higher during in its definite value and load shedding steam temperature on the low side in its definite value, as reverse load shedding suddenly in application of load process, now steam temperature, still lower than pressure definite value, is obtained by formula 12: T
0d=T
0, feedwater becomes adjusting steam temperature, and PID3 reduces confluent, accelerates the power of the assembling unit and declines, and not only varying duty performance improves, and helps steam temperature recovery.
According to the varying duty characteristic of fired power generating unit, there is no the overshoot of combustion rate (or feedwater), varying duty speed is poor, excessive overshoot causes load toning, too small overshoot varying duty rate is less than requiring, the improper unit parameter of overshoot changes also greatly, affects stability and the economy of unit operation.Conventional coordination is controlled and is adopted fixing overshoot, when unit working conditions change, and control performance variation.
This patent has proposed intelligent overshoot control strategy, can be according to varying duty amplitude, speed, the operational factor of unit etc. is estimated overshoot amplitude, make unit have good varying duty performance, the total amount that when total amount of overshoot should be varying duty, unit accumulation of heat changes, this patent is also according to the parameter variation tendency judgement overshoot total amount of unit, make unit complete varying duty after energy in a basic balance, the pressure of steam (and temperature) returns to rated value.Intelligent overshoot better solved hysteresis, time become, nonlinear boiler controls difficult point.
Please refer to Fig. 4, Once-through Boiler feedwater overshoot Main Function is the varying duty speed of accelerating unit, the requirement of balance steam turbine to boiler capacity in time, and it also, according to the variation correction feedwater overshoot of vapour pressure, reduces the amplitude of variation of vapour pressure, and finally makes vapour pressure recover.The overshoot of fuel quantity is mainly that the energy storage of timely supplement boiler changes, the energy of balance unit, and it also, according to the overshoot of the variation correction fuel quantity of specific steam enthalpy, reduces the variation of steam temperature, finally makes steam temperature recover.
When steam turbine pitch, following fast load instruction changes, make full use of the accumulation of heat of unit, while improving the load responding performance at unit initial stage, Once-through Boiler confluent changes in advance, and unit electric load can change fast, but because boiler heat load objectively exists larger delay, it always lags behind the variation of electric load, steam pressure and temperature can have a greater change, so suitably overshoot coal-supplying amount instruction just can reduce the variation of steam pressure and temperature.The overshoot of combustion rate is divided into two parts, and first synchronously changes with confluent by coal water proportion relation, and second portion is mainly used in recovering because feedwater changes the variations in temperature causing in advance.
While having application of load requirement, system triggers the overshoot of combustion rate and confluent, and now because pitch is opened large application of load, and boiler heat load does not also have enough time to increase, and steam pressure and temperature decline.System is according to the overshoot amplitude of the variation correction feedwater of steam temperature, vapour pressure and combustion rate, overshoot due to combustion rate and feedwater, in the later stage of application of load process, boiler heat can be greater than generated energy, steam pressure and temperature rise, and when steam pressure approaches its definite value, reset feedwater and the overshoot of First combustion rate, when vapor (steam) temperature approaches its definite value, second the combustion rate overshoot that resets, returns to desired value because boiler hot inertia finally makes steam pressure and temperature.The control of load shedding is similar to application of load.
Please refer to Fig. 3, the drum boiler overshoot of this patent adopts intelligent decision, and its quantity should equal the accumulation of heat variable quantity utilizing when pitch regulates electric load.It is a certain amount of energy, corresponding to a certain amount of coal, is the area forming overshoot amplitude and overshoot duration, and its size is relevant with the variable quantity of varying duty speed and load.As overshoot amplitude reduces, the overshoot duration will extend; As overshoot amplitude increases, the overshoot duration will reduce, and overshoot amplitude increases, and the dynamic deviation of main vapour pressure can reduce, but larger to the disturbance meeting of boiler.
During application of load, pitch is opened greatly, utilizes the accumulation of heat of unit that electric load is increased fast, and main vapour pressure declines; The ground of the quick overshoot of boiler combustion rate simultaneously changes, and when boiler load surpasses electric load, main vapour pressure bottom out finishes overshoot when pressure gos up to approach its definite value, and main vapour pressure goes back up to its definite value by the inertia of boiler load.The similar process of load shedding.The end of overshoot adopts intelligent decision, is equivalent to control the overshoot duration, and its target is that after having made varying duty task, main vapour pressure just in time returns to its definite value.The control of load shedding is similar to application of load.
In sum, the intelligentized control method for coordinating of fired power generating unit that the present invention proposes, making thermal power plant realize unit load by coordinated control system controls, coordinated control system is generally by regulating the adjusting porthole of boiler combustion rate (and confluent), steam turbine throttle flow, the load variations requirement of responsive electricity grid as early as possible under the prerequisite that guarantees unit safety, and maintain vapour pressure (steam temperature), make Unit Economic and stably operation.
Although the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on claims person of defining.
Claims (10)
1. the intelligentized control method for coordinating of fired power generating unit, is characterized in that, comprising:
Carrying out intelligent coordination of unit controls;
Carry out Once-through Boiler intelligent to water management;
Carrying out intelligent snap back varying duty processes;
Carry out intelligent overshoot control, wherein said intelligent overshoot is controlled and is comprised the intelligent overshoot control of Once-through Boiler and the intelligent overshoot control of drum boiler;
When the intelligent feedwater of described Once-through Boiler is controlled at varying duty, suitably abandon the control of steam temperature, assist control of steam turbine governing valve power, unit is had and continue preferably varying duty performance, complete after varying duty, feedwater is smoothly transitted into control steam temperature, so improves the load adjustment ability of Once-through Boiler unit, and the variation of steam temperature is also controlled in rational scope.
2. the intelligentized control method for coordinating of fired power generating unit according to claim 1, it is characterized in that, the intelligent coordination of described unit is controlled in application of load process, main vapour pressure is lower than pressure definite value, as on the low side, in permissible value, now steam turbine pitch regulates generated output, and the power of the assembling unit equates substantially with power instruction, unit has best load adjustment ability, and the power of the assembling unit can be followed fast power instruction and be changed;
If main vapour pressure surpasses permissible value lower than pressure definite value, now steam turbine pitch has increased the regulating action of main vapour pressure, prevents that main vapour pressure is too low, now the power of the assembling unit can be lower than power instruction, if main vapour pressure continues to decline, answer locking steam turbine pitch to open greatly, guarantee unit safety.
3. the intelligentized control method for coordinating of fired power generating unit according to claim 1, it is characterized in that, described unit is intelligent coordinates to be controlled in load shedding process main vapour pressure higher than pressure definite value, as higher in permissible value, now steam turbine pitch regulates generated output, the power of the assembling unit equates substantially with power instruction, and unit has best load adjustment ability, and the power of the assembling unit can be followed fast power instruction and be changed;
If main vapour pressure surpasses permissible value higher than pressure definite value, now steam turbine pitch has increased the regulating action of main vapour pressure, prevents that main vapour pressure is too high, now the power of the assembling unit can be higher than power instruction, if main vapour pressure continues to rise, answer locking steam turbine pitch to turn down, guarantee unit safety.
4. the intelligentized control method for coordinating of fired power generating unit according to claim 1, it is characterized in that, the intelligent feedwater of described Once-through Boiler is controlled at application of load process, feedwater increases in advance, and steam temperature is lower than temperature definite value, as on the low side in separator temperature in permissible value, there will not be because steam temperature declines and reduce feedwater flow, make power of the assembling unit decline situation, now feedwater is mainly used in the auxiliary adjustment power of the assembling unit, unit is had and continue preferably application of load performance;
If separator temperature is on the low side, surpass permissible value, now feedwater recovers to regulate separator temperature, prevents that steam temperature is too low, guarantees unit safety, and application of load performance can decline to some extent.
5. the intelligentized control method for coordinating of fired power generating unit according to claim 1, it is characterized in that, the intelligent feedwater of described Once-through Boiler is controlled at load shedding process, feedwater reduces in advance, and steam temperature is higher than temperature definite value, as higher in separator temperature in permissible value, there will not be because steam temperature rises and increase feedwater flow, make power of the assembling unit rising situation, now feedwater is mainly used in the auxiliary adjustment power of the assembling unit, unit is had and continue preferably load shedding performance;
If the higher permissible value that surpasses of separator temperature, now feedwater recovers to regulate separator temperature, prevents that steam temperature is too high, guarantees unit safety, and load shedding performance can decline to some extent.
6. the intelligentized control method for coordinating of fired power generating unit according to claim 1, it is characterized in that, described intelligent snap back varying duty is processed in application of load process, as now there is suddenly reverse load shedding requirement, steam turbine group pitch changes towards the direction of closing fast, the feedwater of Once-through Boiler changes towards the direction reducing fast, and the power of the assembling unit can require synchronous variation with electrical network, effectively improves the varying duty performance of unit.
7. the intelligentized control method for coordinating of fired power generating unit according to claim 6, it is characterized in that, described intelligent snap back varying duty is processed suddenly reverse load shedding in application of load process, now the power of the assembling unit is lower than power instruction, main vapour pressure is lower than pressure definite value, and steam turbine pitch becomes adjusting vapour pressure, and pitch turns down fast, varying duty speed is better than electrical network requirement, and helps vapour pressure recovery.
8. the intelligentized control method for coordinating of fired power generating unit according to claim 6, it is characterized in that, described intelligent snap back varying duty is processed suddenly reverse load shedding in application of load process, now Once-through Boiler steam temperature is lower than pressure definite value, feedwater becomes adjusting steam temperature, and confluent reduces, and accelerates the power of the assembling unit and declines, varying duty performance improves, and helps steam temperature recovery.
9. the intelligentized control method for coordinating of fired power generating unit according to claim 1, it is characterized in that, when the intelligent overshoot of described Once-through Boiler has been controlled at application of load and has required, Once-through Boiler intelligent coordinated control system triggers the overshoot of combustion rate and confluent, now because pitch is opened large application of load, and boiler heat load does not also have enough time to increase, steam pressure and temperature decline, wherein overshoot is divided into two parts, first synchronously changes confluent and fuel quantity by coal water proportion relation, second portion is the independent overshoot of fuel quantity, be mainly used in recovering because feedwater changes the variations in temperature causing in advance,
Described Once-through Boiler intelligent coordinated control system is according to the overshoot amplitude of the variation correction feedwater of steam temperature, vapour pressure and combustion rate, overshoot due to combustion rate and feedwater, in the later stage of application of load process, boiler heat can be greater than generated energy, steam pressure and temperature rise, and the first's overshoot that resets when steam pressure approaches its definite value, when vapor (steam) temperature approaches its definite value, the overshoot of reset second portion, returns to desired value because boiler hot inertia finally makes steam pressure and temperature.
10. the intelligentized control method for coordinating of fired power generating unit according to claim 1, is characterized in that, when the intelligent overshoot of described drum boiler is controlled at application of load, pitch is opened greatly, utilizes the accumulation of heat of unit that electric load is increased fast, and main vapour pressure declines; The ground of the quick overshoot of boiler combustion rate simultaneously changes, and when boiler load surpasses electric load, main vapour pressure bottom out finishes overshoot when pressure gos up to approach its definite value, and main vapour pressure goes back up to its definite value by the inertia of boiler load.
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