CN101988697A - Intelligent coordinated control method for thermal power unit - Google Patents
Intelligent coordinated control method for thermal power unit Download PDFInfo
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- CN101988697A CN101988697A CN2009100561255A CN200910056125A CN101988697A CN 101988697 A CN101988697 A CN 101988697A CN 2009100561255 A CN2009100561255 A CN 2009100561255A CN 200910056125 A CN200910056125 A CN 200910056125A CN 101988697 A CN101988697 A CN 101988697A
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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
The tradition coordinated control system mainly contains stove and follows stove (BF), coordinates (CC) three kinds of control modes with machine (BF), machine.As shown in Figure 1, BM is the instruction of control boiler combustion, and TM is the instruction that the control steam turbine is regulated porthole.
Work as K1=K4=1, during K2=K3=0, system is " stove is with machine (BF) " mode, this moment, the steam turbine pitch was regulated the power of the assembling unit, and boiler combustion rate is regulated vapour pressure, and this mode varying duty performance is good, but unit vapour pressure, steam temperature change greatly, and operation stability is poor, helps electrical network.
Work as K1=K4=1, during K2=K3=0, system is " stove is with machine (TF) " mode, this moment, the steam turbine pitch was regulated vapour pressure, and boiler combustion rate is regulated 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 helps power plant.
General at present the employing coordinated (CC) control mode, and this moment, steam turbine pitch and boiler combustion rate were regulated 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 big explanation steam turbine of K1/K2 stresses to regulate load, otherwise the explanation steam turbine stresses to regulate main vapour pressure; The big explanation boiler side of K4/K3 is resetted and is saved main vapour pressure, the joint load otherwise the explanation boiler side is resetted.As seen, TF and BF are two kinds of special situations.
No matter which kind of coordination mode, all having designed load and having instructed the feedforward of boiler instruction (BM), boiler combustion rate is instructed with load correctly, apace to be changed, because the Boiler Steam thermic load is slower to the fuel quantity response, boiler combustion rate should have suitable overshoot when varying duty, accelerate the varying duty speed of unit on the one hand, the accumulation of heat that compensates boiler simultaneously 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 all are direct current cooker, because direct current cooker is not have fixed limit between forced circulation and the heated section, have a large amount of coupling phenomenons between parameter, and the direct current cooker of supercritical parameter is bigger because of thermodynamic property in the peak regulation scope changes, and the hysteresis that its dynamic characteristic showed, time become and non-linear just stronger; Because super critical boiler accumulation of energy ability is littler relatively, generation load control is just more outstanding with the contradiction of boiler parameter control simultaneously.
The feedwater of drum boiler does not influence basically 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 direct current stove all has remarkable influence 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 mainly is applicable to the drum boiler unit at present, is difficult to satisfy the supercritical unit service requirement.
The boiler capacity of direct current stove changes synchronously with confluent, and the control feedwater can change unit generation power fast.Steam temperature is also fast than fuel to the response of feedwater, the unit of especially joining unit pulverized-coal system, because wearing into coal dust, raw coal needs about 1 minute time, combustion rate is regulated steam temperature long delay, so direct current stove unit generally adopts feedwater to regulate separation temperature (or enthalpy) at present, in order to keep steam temperature, require feedwater to change synchronously during varying duty with the flue gas heat that boiler combustion produces, then feedwater must lag behind fuel quantity variation, the varying duty poor-performing of this class generating set like this.
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 control, tradition improves, improve the varying duty performance of unit, satisfy the varying duty requirement of electrical network better, improve the stability and the economy of unit operation, reduce the varying duty cost of unit, coordinate factory's net interests better.
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 the intelligent water management of giving of direct current stove;
Carrying out intelligent snap back varying duty handles;
Carry out intelligent overshoot control, wherein said intelligent overshoot control comprises the intelligent overshoot control of direct current stove and the intelligent overshoot control of drum boiler.
Further, described unit is intelligent coordinates to be controlled at that main vapour pressure is lower than the pressure definite value in the application of load process, as on the low side in permissible value, this moment, the steam turbine pitch was regulated 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 power instruction fast and be changed;
Surpass permissible value if main vapour pressure is lower than the pressure definite value, this moment, the steam turbine pitch increased the regulating action of main vapour pressure, prevented that main vapour pressure is low excessively, this moment, the power of the assembling unit can be lower than power instruction, if main vapour pressure continues to descend, then answer locking steam turbine pitch to open greatly, guarantee unit safety.
Further, described unit is intelligent coordinates to be controlled at that main vapour pressure is higher than the pressure definite value in the load shedding process, as higher in permissible value, this moment, the steam turbine pitch was regulated 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 power instruction fast and be changed;
If main vapour pressure is higher than the pressure definite value and surpasses permissible value, this moment, the steam turbine pitch increased the regulating action of main vapour pressure, prevented that main vapour pressure is too high, this moment, the power of the assembling unit can be higher than power instruction, if main vapour pressure continues to rise, then answer locking steam turbine pitch to turn down, guarantee unit safety.
Further, described intelligent direct current stove feed water control system is when varying duty, suitably abandon the control of steam temperature, assist steam turbine pitch control power, make unit that the varying duty performance of continuing be arranged preferably, finish varying duty after, feedwater is smoothly transitted into the control steam temperature, so promptly improve the load adjustment ability of direct current stove unit, the variation of steam temperature also is controlled in the reasonable range.
Further, in the application of load process, feedwater increases in advance, steam temperature is lower than the temperature definite value, on the low side in permissible value as separator temperature, then can not occur reducing feedwater flow because of steam temperature descends, make power of the assembling unit decline situation, this moment, feedwater was mainly used in the auxiliary adjustment power of the assembling unit, unit is had continue the application of load performance preferably;
Surpass permissible value if separator temperature is on the low side, then feedwater this moment recovers to regulate separator temperature, prevents that steam temperature is low excessively, guarantees unit safety, and the application of load performance can descend to some extent.
Further, in the load shedding process, feedwater reduces in advance, steam temperature is higher than the temperature definite value, higher in permissible value as separator temperature, then can not occur increasing feedwater flow because of steam temperature rises, make power of the assembling unit rising situation, this moment, feedwater was mainly used in the auxiliary adjustment power of the assembling unit, unit is had continue the load shedding performance preferably;
If the higher permissible value that surpasses of separator temperature, then feedwater this moment recovers to regulate separator temperature, prevents that steam temperature is too high, guarantees unit safety, and the load shedding performance can descend to some extent.
Further, described intelligent snap back varying duty is handled in the application of load process, as occurring reverse load shedding requirement this moment suddenly, steam turbine group pitch changes towards the direction of closing fast, the feedwater of direct current stove changes towards the direction that reduces fast, the power of the assembling unit can require to change synchronously with electrical network, effectively improves the varying duty performance of unit.
Further, described intelligent snap back varying duty is handled suddenly reverse load shedding in the application of load process, this moment, the power of the assembling unit was lower than power instruction, main vapour pressure is lower than the pressure definite value, the steam turbine pitch becomes the adjusting vapour pressure, pitch turns down fast, and varying duty speed is better than the electrical network requirement, and helps the vapour pressure recovery.
Further, described intelligent snap back varying duty is handled suddenly reverse load shedding in the application of load process, and this moment, direct current stove steam temperature was lower than the pressure definite value, feedwater becomes the adjusting steam temperature, and confluent reduces, and quickens the power of the assembling unit and descends, the varying duty performance improves, and helps the steam temperature recovery.
Further, the intelligent overshoot of described direct current stove has been controlled at application of load when requiring, the overshoot of system triggers combustion rate and confluent, this moment is because pitch is opened big application of load, and boiler heat load does not also have enough time to increase, and steam pressure and temperature descend, 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 to recover because feedwater changes the variations in temperature that causes in advance;
System is according to the variation correction feedwater of steam temperature, vapour pressure and the overshoot amplitude of combustion rate, because the overshoot of combustion rate and feedwater, in the later stage of application of load process, the boiler heat can be greater than generated energy, steam pressure and temperature rise, when the steam pressure first's overshoot that resets during near its definite value, when vapor (steam) temperature during near its definite value, the second portion combustion rate that resets overshoot is because boiler hot inertia finally makes steam pressure and temperature return to desired value.
Further, when the intelligent overshoot of described drum boiler was controlled at application of load, pitch was opened greatly, utilized the accumulation of heat of unit that electric load is increased fast, and main vapour pressure descends; The ground of the quick overshoot of boiler combustion rate simultaneously changes, and when boiler load surpassed electric load, the main vapour pressure bottom out finished overshoot when pressure gos up near 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, make thermal power plant realize unit load control by coordinated control system, 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 keep vapour pressure (steam temperature), make unit economy and operation stably.
Description of drawings
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 direct current stove 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 cooperate 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 the intelligent water management of giving of direct current stove;
Step S300: carry out intelligent snap back varying duty and handle;
Step S400: carry out intelligent overshoot control, wherein said intelligent overshoot control comprises the intelligent overshoot control of direct current stove and the intelligent overshoot control of drum boiler.
Present coordinated control system adopts conventional fixed control mode as shown in Figure 1, 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 the BF mode when varying load condition, this moment, the steam turbine pitch was controlled power under the prerequisite that guarantees unit safety, give play to the fastest varying duty performance of unit, in time satisfied the AGC varying duty requirement of electrical network.Finish the coordination mode that carries out the transition to TF after the varying duty or help unit, steam turbine pitch transition smoothly is the main vapour pressure of regulating, and makes unit under steady working condition, is in stable, the most most economical method of operation.Realized factory's net coordination preferably.
As Fig. 3, the steam turbine pitch regulating system that PID1 constitutes is a rapid system, and making input deviation E1 is 0.By the coordination mode control module, make E1 that different models be arranged, the steam turbine pitch is born different adjusting tasks.
Symbol description:
N: the power of the assembling unit, N
0: power instruction, N
0i: the power instruction during application of load, N
0d: the load instruction during load shedding.
P
t: main vapour pressure; P
0: the pressure definite value; P
0i: the pressure definite value during application of load; P
0d: the 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
0i-N)-K (P
0i-P
t) formula 3
Because the power of the assembling unit generally is lower than power instruction in the application of load process, is obtained by formula 1: N
0i=N
0, main vapour pressure generally is lower than the pressure definite value,, is obtained by formula 2: P in permissible value as on the low side
0i=P
t, obtain by formula 3:
E1=(N
0-N) formula 4
By formula 4 as seen, this moment, the steam turbine pitch was regulated generated output, and the power of the assembling unit equates with power instruction that basically unit has best load adjustment ability, and the power of the assembling unit can be followed power instruction fast and be changed, and this is a normal situation in the application of load process.
Surpass permissible value (δ) if main vapour pressure is lower than the pressure definite value, obtain by formula 2: P
0i=P
0-δ is obtained by formula 3:
E1=(N
0-N)-K (P
0-δ-P
t) formula 5
By formula 5 as seen, this moment, the steam turbine pitch increased the regulating action of main vapour pressure, prevented that main vapour pressure is low excessively, and this moment, the power of the assembling unit can be on the low side in power instruction, if main vapour pressure continues to descend, then answered locking steam turbine pitch to open greatly, guaranteed 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
t)] formula 7
PID1 input deviation during load shedding:
E1
d=(N
0d-N)-K (P
0d-P
t) formula 8
Because generated output generally is higher than power instruction in the load shedding process, is obtained by formula 6: N
0d=N
0, main vapour pressure generally is higher than the pressure definite value,, is obtained by formula 7: P in permissible value as higher
0d=P
t, obtain by formula 8:
E1=(N
0-N) formula 9
By formula 9 as seen, this moment, the steam turbine pitch was regulated generated output, and the power of the assembling unit equates with power instruction that basically unit has best load adjustment ability, and the power of the assembling unit can be followed power instruction fast and be changed, and this is a normal situation in the load shedding process.
If main vapour pressure is higher than the pressure definite value and surpasses permissible value (δ), obtain by formula 7: P
0d=P
0+ δ is obtained by formula 8:
E1=(N
0-N)-K (P
0+ δ-P
t) formula 10
By formula 10 as seen, this moment, the steam turbine pitch increased the regulating action of main vapour pressure, prevented that main vapour pressure is too high, and this moment, the power of the assembling unit can be higher in power instruction, if main vapour pressure continues to rise, then answered locking steam turbine pitch to turn down, and guaranteed unit safety.
In the varying duty process, boiler side PID2 does to change accordingly, and E2 is generally the deviation of main vapour pressure and pressure definite value.
After carrying out the transition to stable state from varying duty, coordination mode switchback TF or more stable coordination mode.
Please refer to Fig. 4, supercritical unit does not have like that big accumulation of heat of drum boiler, so the power of the assembling unit changes lessly when pitch changes, can only satisfy electrical network initial stage and varying duty requirement very by a small margin, can not satisfy lasting by a relatively large margin varying duty requirement.The boiler capacity of direct current stove changes synchronously with confluent, and the control feedwater can change unit generation power fast, and this also is the main path that the supercritical unit energy storage utilizes.Steam temperature is fast more than fuel to the response of feedwater, regulates load by feedwater, and the varying duty performance is good, but the steam temperature deviation is bigger, otherwise steam temperature is regulated in feedwater, and then steam temperature changes less, but the varying duty poor performance, the load control of visible direct current stove unit is contradictory with control of steam temperature.
This intelligent feed water control system is when varying duty, suitably abandon the control of steam temperature, assist steam turbine pitch control power, unit is had continue the varying duty performance preferably, after finishing varying duty, feedwater is smoothly transitted into the control steam temperature, so promptly improves the load adjustment ability of supercritical unit, and the variation of steam temperature also is controlled in the reasonable range.
Symbol description:
T: separator temperature; T
0: the temperature definite value; T
0i: the temperature definite value during application of load; T
0d: the 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
Because the application of load process, feedwater increases in advance, and steam temperature generally can be lower than the temperature definite value, and is on the low side in permissible value as separator temperature, obtained by formula 11: T
0i=T, PID3 is input as 0, can not occur reducing feedwater flow because of steam temperature descends, and makes power of the assembling unit decline situation, and this moment, feedwater was mainly used in the auxiliary adjustment power of the assembling unit, unit is had continue the varying duty performance preferably.Surpass permissible value if separator temperature is on the low side, then obtain: T by formula 11
0i=T
0-σ, feedwater this moment recovers to regulate separator temperature, prevents that steam temperature is low excessively, guarantees unit safety, and the varying duty performance can descend 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 can be higher than the temperature definite value, and is higher in permissible value as separator temperature, obtained by formula 12: T
0d=T, PID3 is input as 0, and can not occur increases feedwater flow because of steam temperature rises, and makes power of the assembling unit rising situation, and this moment, feedwater was mainly used in the auxiliary adjustment power of the assembling unit, unit is had continue the varying duty performance preferably.If the higher permissible value that surpasses of separator temperature is then obtained by formula 12: T
0i=T
0+ σ, feedwater this moment recovers to regulate separator temperature, prevents that steam temperature is too high, guarantees unit safety, and the varying duty performance can descend to some extent.
One in electrical network requires the system of generating and the timely balance of electricity consumption, and through regular meeting's appearance back and forth varying duty requirement up and down, this patent has the function of the power of the assembling unit made from electrical network requirement snap back varying duty.
In the application of load process, as occurring reverse load shedding requirement this moment suddenly, under present coordinated control system, because power instruction has rate limit, the power of the assembling unit still is lower than power instruction in a period of time, so the steam turbine pitch can change towards holding general orientation, power generation energy resource is also wasted in the delay that causes reversal of load to change.In this patent, occur changeing the varying duty that subtracts when requiring by adding, obtain by formula 6: N
0=N, the PID1 power instruction is by N
0Become N, steam turbine group pitch changes towards the direction of closing fast.As seen the power of the assembling unit can require to change synchronously with electrical network, has improved the varying duty performance of unit effectively.
When application of load appears in regular meeting in the time of in frequent varying duty process main vapour pressure higher when its definite value and load shedding main vapour pressure on the low side in its definite value; as suddenly reverse load shedding in the application of load process; this moment, not only the power of the assembling unit was lower than power instruction; and main vapour pressure also is lower than the pressure definite value, by formula 6,7,, 8 obtain: E1=K (P
0-P
t), the steam turbine pitch becomes the adjusting vapour pressure, and pitch turns down fast, and varying duty speed can be better than the electrical network requirement, and it all is favourable doing electrical network and unit like this, because this moment, the pitch varying duty was consistent with the direction of recovering main vapour pressure.
Same when application of load appears in direct current stove regular meeting in frequent varying duty process the time steam temperature higher when its definite value and load shedding steam temperature on the low side in its definite value, as reverse load shedding suddenly in the application of load process, this moment, steam temperature still was lower than the pressure definite value, was obtained by formula 12: T
0d=T
0, feedwater becomes the adjusting steam temperature, and PID3 reduces confluent, quickens the power of the assembling unit and descends, and not only the varying duty performance improves, and helps the steam temperature recovery.
According to the varying duty characteristic of fired power generating unit, there is not the overshoot of combustion rate (or feedwater), varying duty speed is relatively poor, excessive overshoot causes the load toning, too small overshoot varying duty speed does not reach requirement, and the improper unit parameter of overshoot changes also greatly, influences the stability and the economy of unit operation.Fixing overshoot is adopted in conventional coordination control, when the unit working conditions change, and the 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 the overshoot amplitude, make unit that varying duty performance preferably be arranged, the total amount that the unit accumulation of heat changed when the total amount of overshoot should be varying duty, this patent is also judged the overshoot total amount according to the parameter variation tendency of unit, make unit finish varying duty after energy in a basic balance, the pressure of steam (and temperature) returns to rated value.Intelligent overshoot better solved hysteresis, the time become, nonlinear boiler control difficult point.
Please refer to Fig. 4, it is the varying duty speed of accelerating unit that direct current stove feedwater overshoot mainly acts on, and in time the balance steam turbine is to the requirement of boiler capacity, and it also according to the variation correction feedwater overshoot of vapour pressure, reduces the amplitude of variation of vapour pressure, and vapour pressure is recovered.The overshoot of fuel quantity mainly is 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, and steam temperature is recovered.
Following the load instruction fast when the steam turbine pitch changes, make full use of the accumulation of heat of unit, when improving the load responding performance at unit initial stage, direct current stove confluent changes in advance, and the unit electric load can change fast, but because boiler heat load objectively exists bigger delay, it always lags behind the variation of electric load, steam pressure and temperature have bigger variation, so suitably overshoot coal-supplying amount instruction just can reduce steam pressure and variation of temperature.The overshoot of combustion rate is divided into two parts, and first changes with confluent synchronously by coal water proportion relation, and second portion is mainly used in and recovers because feedwater changes the variations in temperature that causes in advance.
When the application of load requirement is arranged, the overshoot of system triggers combustion rate and confluent, this moment is because pitch is opened big application of load, and boiler heat load does not also have enough time to increase, steam pressure and temperature descend.System is according to the variation correction feedwater of steam temperature, vapour pressure and the overshoot amplitude of combustion rate, because the overshoot of combustion rate and feedwater, in the later stage of application of load process, the boiler heat can be greater than generated energy, steam pressure and temperature rise, when steam pressure reset during near its definite value feedwater and first combustion rate overshoot, when vapor (steam) temperature during near its definite value, second the combustion rate overshoot that resets is because boiler hot inertia finally makes steam pressure and temperature return to desired value.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, the accumulation of heat variable quantity that utilizes when its quantity should equal pitch adjusting electric load.It is a certain quantity of energy, corresponding to a certain amount of coal, is the area that forms overshoot amplitude and overshoot duration, and its size is relevant with the variable quantity of varying duty speed and load.Reduce as the overshoot amplitude, the overshoot duration will prolong; Increase as the overshoot amplitude, the overshoot duration will reduce, and the overshoot amplitude increases, and the dynamic deviation of main vapour pressure can reduce, but bigger 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 descends; The ground of the quick overshoot of boiler combustion rate simultaneously changes, and when boiler load surpassed electric load, the main vapour pressure bottom out finished overshoot when pressure gos up near 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.Intelligent decision is adopted in the end of overshoot, is equivalent to control the overshoot duration, its target be make finish the varying duty task after main vapour pressure just in time return 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, make thermal power plant realize unit load control by coordinated control system, 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 keep vapour pressure (steam temperature), make unit economy and operation stably.
Though the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.The 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 as the criterion when looking claims person of defining.
Claims (11)
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 the intelligent water management of giving of direct current stove;
Carrying out intelligent snap back varying duty handles;
Carry out intelligent overshoot control, wherein said intelligent overshoot control comprises the intelligent overshoot control of direct current stove and the intelligent overshoot control of drum boiler.
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 the application of load process, main vapour pressure is lower than the pressure definite value, in permissible value, this moment, the steam turbine pitch was regulated generated output as on the low side, 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 power instruction fast and be changed;
Surpass permissible value if main vapour pressure is lower than the pressure definite value, this moment, the steam turbine pitch increased the regulating action of main vapour pressure, prevented that main vapour pressure is low excessively, this moment, the power of the assembling unit can be lower than power instruction, if main vapour pressure continues to descend, then 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 at that main vapour pressure is higher than the pressure definite value in the load shedding process, as higher in permissible value, this moment, the steam turbine pitch was regulated generated output, the power of the assembling unit equates substantially that with power instruction unit has best load adjustment ability, and the power of the assembling unit can be followed power instruction fast and be changed;
If main vapour pressure is higher than the pressure definite value and surpasses permissible value, this moment, the steam turbine pitch increased the regulating action of main vapour pressure, prevented that main vapour pressure is too high, this moment, the power of the assembling unit can be higher than power instruction, if main vapour pressure continues to rise, then 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, described intelligent direct current stove feed water control system is when varying duty, suitably abandon the control of steam temperature, assist steam turbine pitch control power, unit is had continue the varying duty performance preferably, after finishing varying duty, feedwater is smoothly transitted into the control steam temperature, so promptly improves the load adjustment ability of direct current stove unit, and the variation of steam temperature also is controlled in the reasonable range.
5. the intelligentized control method for coordinating of fired power generating unit according to claim 4, it is characterized in that, in the application of load process, feedwater increases in advance, and steam temperature is lower than the temperature definite value, and is on the low side in permissible value as separator temperature, then can not occur reducing feedwater flow because of steam temperature descends, make power of the assembling unit decline situation, this moment, feedwater was mainly used in the auxiliary adjustment power of the assembling unit, unit is had continue the application of load performance preferably;
Surpass permissible value if separator temperature is on the low side, then feedwater this moment recovers to regulate separator temperature, prevents that steam temperature is low excessively, guarantees unit safety, and the application of load performance can descend to some extent.
6. the intelligentized control method for coordinating of fired power generating unit according to claim 4, it is characterized in that, in the load shedding process, feedwater reduces in advance, and steam temperature is higher than the temperature definite value, and is higher in permissible value as separator temperature, then can not occur increasing feedwater flow because of steam temperature rises, make power of the assembling unit rising situation, this moment, feedwater was mainly used in the auxiliary adjustment power of the assembling unit, unit is had continue the load shedding performance preferably;
If the higher permissible value that surpasses of separator temperature, then feedwater this moment recovers to regulate separator temperature, prevents that steam temperature is too high, guarantees unit safety, and the load shedding performance can descend to some extent.
7. 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 handled in the application of load process, as occurring reverse load shedding requirement this moment suddenly, steam turbine group pitch changes towards the direction of closing fast, the feedwater of direct current stove changes towards the direction that reduces fast, and the power of the assembling unit can require to change synchronously with electrical network, effectively improves the varying duty performance of unit.
8. the intelligentized control method for coordinating of fired power generating unit according to claim 7, it is characterized in that, described intelligent snap back varying duty is handled suddenly reverse load shedding in the application of load process, this moment, the power of the assembling unit was lower than power instruction, main vapour pressure is lower than the pressure definite value, and the steam turbine pitch becomes the adjusting vapour pressure, and pitch turns down fast, varying duty speed is better than the electrical network requirement, and helps the vapour pressure recovery.
9. the intelligentized control method for coordinating of fired power generating unit according to claim 7, it is characterized in that, described intelligent snap back varying duty is handled suddenly reverse load shedding in the application of load process, this moment, direct current stove steam temperature was lower than the pressure definite value, feedwater becomes the adjusting steam temperature, and confluent reduces, and quickens the power of the assembling unit and descends, the varying duty performance improves, and helps the steam temperature recovery.
10. the intelligentized control method for coordinating of fired power generating unit according to claim 1, it is characterized in that, the intelligent overshoot of described direct current stove has been controlled at application of load when requiring, the overshoot of system triggers combustion rate and confluent, this moment is because pitch is opened big application of load, and boiler heat load does not also have enough time to increase, steam pressure and temperature descend, wherein overshoot is divided into two parts, first changes confluent and fuel quantity synchronously by coal water proportion relation, second portion is the independent overshoot of fuel quantity, is mainly used in to recover because feedwater changes the variations in temperature that causes in advance;
System is according to the variation correction feedwater of steam temperature, vapour pressure and the overshoot amplitude of combustion rate, because the overshoot of combustion rate and feedwater, in the later stage of application of load process, the boiler heat can be greater than generated energy, steam pressure and temperature rise, when steam pressure first overshoot that resets during near its definite value, when vapor (steam) temperature during near its definite value, second overshoot that resets is because boiler hot inertia finally makes steam pressure and temperature return to desired value.
11. 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 was controlled at application of load, pitch was opened greatly, utilized the accumulation of heat of unit that electric load is increased fast, and main vapour pressure descends; The ground of the quick overshoot of boiler combustion rate simultaneously changes, and when boiler load surpassed electric load, the main vapour pressure bottom out finished overshoot when pressure gos up near its definite value, and main vapour pressure goes back up to its definite value by the inertia of boiler load.
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