CN110347201A - A kind of condensed water auxiliary frequency modulation control method and system unidirectionally accurately controlled - Google Patents
A kind of condensed water auxiliary frequency modulation control method and system unidirectionally accurately controlled Download PDFInfo
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- CN110347201A CN110347201A CN201910738687.1A CN201910738687A CN110347201A CN 110347201 A CN110347201 A CN 110347201A CN 201910738687 A CN201910738687 A CN 201910738687A CN 110347201 A CN110347201 A CN 110347201A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/18—Applications of computers to steam boiler control
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- G—PHYSICS
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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Abstract
The present invention discloses a kind of condensed water auxiliary frequency modulation control method unidirectionally accurately controlled, comprises the following processes: obtaining unit operating parameter；The condensing water flow that current unit throttling frequency modulation increases the acting capacity limit in direction and needs to change is calculated according to the unit operating parameter；Judge whether to trigger frequency modulation function according to the acting capacity limit that current unit throttling frequency modulation increases direction, if then carrying out in next step, otherwise without adjusting；The override amount of oxygen-eliminating device pitch is calculated according to the discharge characteristic of condensing water flow, current unit load and the oxygen-eliminating device door for needing to change；In the case where deaerator level pitch adjusts water level mode, oxygen-eliminating device pitch is controlled to corresponding aperture according to the override amount.The present invention can quickly improve the small steam turbine of restriction loss and do work upwards the ability of responsive electricity grid primary frequency modulation in the case where guaranteeing existing operating parameter and operating condition.
Description
Technical field
The invention belongs to fossil-fired unit control technology fields, and in particular to a kind of condensed water unidirectionally accurately controlled is auxiliary
Help frequency modulation control method and system.
Background technique
With the development of society, also higher and higher to the cost-effectiveness requirement of fired power generating unit power generation.In order to improve coal fired power generation
The coal consumption for power generation of unit, steam turbine Tong Liao area are a kind of technologies being widely used.Various new-built units will also decrease simultaneously
The restriction loss of accidental conditions tubine is as one of the important means of raising steam turbine power generation economy.
Existing primary frequency modulation auxiliary control method is various, has their own characteristics.Applicable machine set type, operating condition and
The effect generated to unit primary frequency modulation is all different.Wherein steam turbine throttling frequency modulation is most widely used.It operated normally
Cheng Zhong if increasing unit throttling, and causes many detrimental effects to the economics of power generation of entire unit.It is existing two-way solidifying
The control method for bearing water auxiliary Power Regulation, by quickly increasing, subtracting the flow of condensed water to oxygen-eliminating device, fast prompt drop rises unit load
Method.For the method when the practical situations with unit condensate system match, the amplitude of accommodation and response speed are all opposite
It is smaller；This control optimisation strategy is in different load section simultaneously, chief and vice two to auxiliary Power Regulation ability deviation it is very big.Two-way condensation
The flow of control method requirement control condensed water to the oxygen-eliminating device of water auxiliary Power Regulation quickly can significantly increase or can be fast
Speed significantly reduces.Guarantee that the power of the assembling unit quickly can reduce and increase therewith with this.But existing each generating set
Condensate system in order to save station service consider, be substantially work water pitch standard-sized sheet, Condensate Pump Frequency Conversion on oxygen-eliminating device
The working condition of water transfer position.If at this moment needing to reduce power, it is desirable to quickly increase the flow of condensed water to oxygen-eliminating device.Due to
Water pitch is shown in a fully open operation on oxygen-eliminating device.It, can only be by increasing Condensate Pump Frequency Conversion device frequency to increase condensing capacity
The method of rate reaches；But each frequency converter determines that its frequency can not be quicklyd increase and be reduced due to its internal structure.This
Limit the rate that such control strategy quickly assists load shedding.Simultaneously for saving of purchase cost and performance driving economy, often
The nominal output of platform condensate pump is essentially close under operating condition at full capacity, the normal of condensed water to oxygen-eliminating device goes up water flow.Therefore
In the high load capacity stage, the amplitude that load is quickly reduced by increasing condensed water also becomes very little, especially close at full capacity
Near, it can ignore substantially.
And in order to assist load shedding quickly through condensed water, it is desirable that quickly increase condensed water to oxygen-eliminating device, this can be destroyed
The balance of oxygen-eliminating device Inlet and outlet water, causes deaerator level to quickly increase, and deaerator level is excessively high and has the danger of chaser.In order to
Guarantee unit safety operation, by the more relatively low of deaerator level setting when normal operation.Guarantee certain oxygen-eliminating device water
The reason of position will not assist frequency modulation because of condensed water reaches dangerous values.After deaerator level reduces when normal operation, work as condensed water
When frequency modulation being assisted to need to increase load by reducing condensing water flow, the water that the flow of reduction just needs to lay in oxygen-eliminating device is mended
It fills, due to just being reduced in deaerator level normal course of operation, in the case where guaranteeing unit operational safety, water on oxygen-eliminating device
Reduction all drops in the time and amplitude for allowing reduced flow.Therefore, if two-way auxiliary frequency modulation, in order to guarantee at deaerator level
It is exactly that deaerator level will be in relatively intermediate position in comparatively safe position.The volume of oxygen-eliminating device determines condensed water
Two-way auxiliary frequency modulation movement range and response time all cannot be excessive.
Summary of the invention
It is an object of the invention to overcome deficiency in the prior art, a kind of condensed water auxiliary unidirectionally accurately controlled is provided
Frequency modulation control method and system can quickly improve the small steam turbine of restriction loss in the case where guaranteeing existing operating parameter and operating condition
The ability of acting responsive electricity grid primary frequency modulation upwards.
To solve prior art problem, the invention discloses a kind of condensed waters unidirectionally accurately controlled to assist frequency modulation control side
Method comprises the following processes:
Unit operating parameter is obtained, the unit operating parameter includes steam pressure, vapor (steam) temperature and steam turbine flow；
Primary frequency modulation demand is calculated according to the unit operating parameter, current unit throttling frequency modulation increases direction and does function
The power limit and the condensing water flow for needing to change；
Increase the acting capacity limit in direction according to current unit throttling frequency modulation and primary frequency modulation demand judges whether to trigger
Condensed water assists frequency modulation function, if then carrying out in next step, otherwise without adjusting；
According to condensed water under condensing water flow, current unit load and the rated load for needing to change to oxygen-eliminating device
Design discharge calculates the override amount of water pitch on oxygen-eliminating device；
Water pitch is adjusted under deaerator level mode on oxygen-eliminating device, and the main PID of locking deaerator level regulating system is adjusted,
Then oxygen-eliminating device pitch is controlled to corresponding aperture, finally by deaerator level regulating system secondary PID according to the override amount
Closed loop adjusts control condensing water flow and reaches setting value.
Further,
The specific mistake that current unit throttling frequency modulation increases the acting capacity limit in direction is calculated according to the unit operating parameter
Journey are as follows:
Every 1% steam turbine flow under primary frequency modulation demand and nominal steam temperature is calculated according to the unit operating parameter
Load variations amount caused by changing；
According to load variations caused by 1 DEG C of vapor (steam) temperature of the primary frequency modulation demand and every variation, every 1% changes in flow rate
Amount calculates the maximum value and pressure correcting coefficient of current unit throttling frequency modulation；
It is calculated under any operating condition according to the maximum value of the current unit throttling frequency modulation and the pressure correcting coefficient
Unit throttling frequency modulation increases the acting capacity limit in direction.
Further,
The calculation formula of the primary frequency modulation demand are as follows:
ΔW1=Wf/S；
Wherein, WfFor current unit load corresponding operating pressure P and nominal steam temperature TeTubine flow increases
Actual power incrementss after S%；
The calculation formula of load variations amount caused by 1 DEG C of vapor (steam) temperature of every decline, every 1% changes in flow rate are as follows:
ΔW2=[Wf(Wf- Wt)/ΔT]·ΔW1/Wf；
Wherein, Δ T=Te-Tt, TtTo generate changed power WtVapor (steam) temperature, TeFor nominal steam temperature, WtIt is identical
Under pressure P, when temperature deviation is T DEG C of Δ, steam turbine flow increases unit actual power changing value after S%.
Further,
The calculation formula of the maximum value of throttling frequency modulation under the current unit steam pressure P are as follows:
ΔWmax=(100-TF)·ΔW2·[Wf-(Wf- Wt)·(Te-T)/ΔT]·Wf；
Wherein, TeIt is given value for nominal steam temperature, T is current steam temperature, TFFor flow before steam turbine frequency modulation,
WtFor under uniform pressure P, and when nominal steam temperature deviation is T DEG C of Δ, unit actual power becomes after steam turbine flow increases S%
Change value；
The calculation formula of the pressure correcting coefficient are as follows:
Kp=[Wf-(Wf-Wf2)·(P-Px)/ΔP]/Wf；
Wherein, Δ P=P-Pe, P is to generate changed power WfSteam pressure, PeTo generate changed power Wf2Vapour pressure
Power, PxFor any pressure, Wf2Under operating condition for deviation delta P, nominal steam temperature and steam turbine flow increase unit reality after S%
Power change values.
Further,
Under any operating condition, unit throttling frequency modulation increases the calculation formula of the acting capacity limit in direction are as follows:
ΔWmax2=Δ Wmax·Kp；
Wherein, Δ WmaxFor steam pressure P, vapor (steam) temperature T, steam turbine flow TFUnder, the maximum value of unit throttling frequency modulation, Kp
For pressure correcting coefficient.
Further,
The calculation formula of the condensing water flow for needing to change are as follows:
Fn=η (Δ W1Δ Wmax2)；
Wherein, FnTo need the condensing water flow changed, η is condensing water flow variation coefficient, and value is unit condensed water
The ratio of the unit load increment of the reduction amount and generation of flow；ΔW1For primary frequency modulation demand, Δ Wmax2For current unit section
Flow the acting capacity limit that frequency modulation increases direction.
Further,
Judge whether the condition of triggering frequency modulation function according to the acting capacity limit that current unit throttling frequency modulation increases direction are as follows:
If meeting Δ W1Δ Wmax2> 0 then triggers auxiliary frequency modulation function, does not otherwise trigger frequency modulation function；
Wherein, Δ W1For primary frequency modulation demand, Δ Wmax2Increase direction for the frequency modulation that throttles of unit under current working and do function
The power limit.
Further,
The calculation formula of override amount are as follows:
Q=[1-We/W·(Fn/Yn)]·100；
WeUnit actual load before assisting frequency modulation for condensed water, W are unit rated load, YnTo be condensed under rated load
Water is to oxygen-eliminating device design discharge.
Further,
Further include following process:
Deaerator level after being restored according to mains frequency judges whether to need to eliminate deaerator level inclined with preset water level
Difference adds the frequency of Condensate Pump Frequency Conversion device if deaerator level adjusting is then switched to Condensate Pump Frequency Conversion shaping modes
One positive bias with fast quick-recovery deaerator level until oxygen-eliminating device actual water level and water level settings value deviation setting range with
It is interior, the frequency offset of condensed water frequency converter is then reverted into " 0 ", is finally latched the output that deaerator level adjusts main PID
Release restores condensed water frequency conversion tune water level control.
The invention also discloses a kind of condensed waters unidirectionally accurately controlled to assist frequency-modulation control system, comprising:
Module is obtained, for obtaining unit operating parameter；
First computing module, for calculating the acting that current unit throttling frequency modulation increases direction according to the unit operating parameter
Capacity limit and the condensing water flow for needing to change；
Judgment module, for increasing the acting capacity limit and unit primary frequency modulation need in direction according to current unit throttling frequency modulation
It asks and judges whether to trigger condensed water auxiliary frequency modulation function, if then carrying out in next step, otherwise without adjusting；
Second computing module, for according to the condensing water flow for needing to change, current unit load and specified negative
Condensed water calculates the override amount of water pitch on oxygen-eliminating device to oxygen-eliminating device design discharge under lotus；
Adjustment module, under the water pitch adjusting deaerator level mode on oxygen-eliminating device, locking deaerator level to be adjusted
The main PID of system is adjusted, and then controls oxygen-eliminating device pitch to corresponding aperture, finally by deaerator level according to the override amount
Regulating system secondary PID closed loop adjusts control condensing water flow and reaches setting value.
The invention has the benefit that
1. the present invention is in the case where guaranteeing existing operating parameter and operating condition, the short time quickly improve the small steam turbine of restriction loss to
The ability of upper acting responsive electricity grid primary frequency modulation.
Become 2. the present invention after mains frequency recovery, is opened deaerator level and adjusted door and improve condensate pump by control
The method of the frequency of frequency device quickly, steadily restores the water level of oxygen-eliminating device and condenser.Guarantee that unit operates normally, while being next time
Condensed water auxiliary frequency modulation is prepared.
3. the present invention can it is unidirectional reduce condensed water to oxygen-eliminating device flow, by by deaerator level be set in compared with
High safety level increases the reservoir storage of oxygen-eliminating device in normal course of operation, can utilize the water storage of oxygen-eliminating device to greatest extent
Amount guarantees the normal operation of boiler feedwater.Condensed water auxiliary frequency modulation is allowed significantly and for a long time to remain increased as far as possible
Load maintains to coordination system to work by increase coal amount increase load or mains frequency restores normal.
Detailed description of the invention
Fig. 1 is primary frequency modulation performance plot in the present invention；
Fig. 2 is the systematic schematic diagram that frequency-modulating process is assisted in the present invention；
Deaerator level adjusting switchback Condensate Pump Frequency Conversion regulating loop is after Fig. 3 restores for mains frequency in the present invention
System schematic diagram；
Fig. 4 is the flow chart in the present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figures 1 to 4, a kind of condensed water auxiliary frequency modulation control method unidirectionally accurately controlled, comprises the following processes:
Unit operating parameter is obtained, unit operating parameter includes steam pressure, vapor (steam) temperature and steam turbine flow.
Changed according to the acting capacity limit that unit operating parameter calculates current unit throttling frequency modulation increasing direction with needs
Condensing water flow.Specifically,
The detailed process that current unit throttling frequency modulation increases the acting capacity limit in direction is calculated according to unit operating parameter are as follows:
Every 1% steam turbine flow under primary frequency modulation demand and nominal steam temperature is calculated according to the unit operating parameter
Load variations amount, calculation formula caused by changing are respectively as follows:
ΔW1=Wf/S；
Wherein, WfFor current unit rated load corresponding pressure P and nominal steam temperature TeTubine flow increases
Actual power incrementss after S%, in specific implementation process, S preferably 5.
ΔW2=[Wf(Wf- Wt)/ΔT]·ΔW1/Wf；
Wherein, Δ T=Te-Tt, TtTo generate changed power WtVapor (steam) temperature, TeFor nominal steam temperature, WtIt is identical
Under pressure P, and nominal steam temperature deviation be T DEG C of Δ when, steam turbine flow increase S% after unit actual power changing value, tool
In body implementation process, preferably 10 DEG C of Δ T.
According to load variations meter caused by 1 DEG C of vapor (steam) temperature of primary frequency modulation demand and every decline, every 1% changes in flow rate
The maximum value and pressure correcting coefficient of current unit throttling frequency modulation are calculated, calculation formula is respectively as follows:
ΔWmax=(100-TF)·ΔW2·[Wf-(Wf- Wt)]·(Te-T)/ΔT]·Wf；
Wherein, Δ WmaxFor the maximum value of current unit throttling frequency modulation, TeIt is given value, specifically for nominal steam temperature
In implementation process, TePreferably 605 DEG C, T is vapor (steam) temperature, TFFor flow before steam turbine frequency modulation, WtFor under uniform pressure P, with volume
Determine vapor (steam) temperature deviation be T DEG C of Δ when, steam turbine flow increase S% after unit actual power changing value.
Kp=[Wf-(Wf-Wf2)·(P-Px)/ΔP]/Wf；
Wherein, KpFor pressure correcting coefficient, Δ P=P-Pe, unit MPa, P are to generate changed power WfSteam pressure,
PeTo generate changed power Wf2Steam pressure, be known quantity, PxFor any pressure, Wf2It is specified under operating condition for deviation delta P
Vapor (steam) temperature and steam turbine flow increase unit actual power changing value after S%.
Current unit throttling frequency modulation is calculated according to the maximum value of unit throttling frequency modulation and pressure correcting coefficient under current pressure
The acting capacity limit for increasing direction, its calculation formula is:
ΔWmax2=Δ Wmax·Kp；
Wherein, Δ Wmax2Increase the acting capacity limit in direction, Δ W for unit throttling frequency modulation under any operating conditionmaxCurrently to press
The maximum value of unit throttling frequency modulation, K under power PpFor pressure correcting coefficient.
The formula for needing the condensing water flow changed is calculated according to unit operating parameter are as follows:
Fn=η (Δ W1Δ Wmax2)；
Wherein, FnTo need the condensing water flow changed, η is condensing water flow variation coefficient, and value is unit condensed water
The ratio of the unit load increment of the reduction amount and generation of flow.
The throttling frequency modulation under unit current working parameter can be calculated in real time by model above increases direction acting ability
Limit Δ Wmax2Value.As shown in Figure 1, (being lower than 49.9333Hz) when mains frequency fluctuation, it is desirable that relate to net unit primary frequency modulation
When increasing load, by frequency difference load transition circuit preset in DCS system, corresponding primary frequency modulation demand is calculated, is calculated
Method is calculated according to net frequency at that time with unit rated load, and corresponding relationship is as shown in Figure 1.National regulation requires to work as mains frequency
0.183Hz is fluctuated, unit primary frequency modulation demand corresponds to 6%Pe (rated load).The wherein dead zone ± 0.0333Hz, other is line
Sexual intercourse.2rpm corresponds to 0.0333Hz, and 11rpm corresponds to 0.183Hz.
Judge whether triggering auxiliary frequency modulation function according to the acting capacity limit that current unit throttling frequency modulation increases direction, if
It then carries out in next step, otherwise without adjusting.
Whether the Rule of judgment of frequency modulation function is triggered are as follows:
If meeting Δ W1Δ Wmax2> 0 then illustrates that unit throttling frequency modulation can not meet primary frequency regulation of power network under current working
Requirement, need to carry out auxiliary frequency modulation, otherwise illustrate current unit throttling frequency modulation can with the requirement of full scale unit primary frequency modulation,
Without assisting frequency modulation.
The discharge characteristic of water pitch calculates on the condensing water flow that is varied as desired, current unit load and oxygen-eliminating device
The override amount of oxygen-eliminating device pitch.The calculation formula of override amount are as follows:
Q=[1-We/W·(Fn/Yn)]·100；
Wherein, WeUnit actual load before assisting frequency modulation for condensed water, W are unit rated load, YnFor under rated load
For condensed water to oxygen-eliminating device design discharge, which is the specific known quantity of unit.
When controlling pitch movement, need to determine that pitch override amount is instructed according to override amount, which is passed through by override amount Q
On oxygen-eliminating device water pitch discharge characteristic function conversion obtain, this discharge characteristic function by oxygen-eliminating device Shang Shui pitch producer provide or
Live pitch Flow characteristic test obtains, belongs to known function or function that those skilled in the art are readily available, therefore not
Repeat its derivation process.
Water pitch is adjusted under deaerator level mode on oxygen-eliminating device, instructs control oxygen-eliminating device pitch to phase according to override amount
Then the aperture answered is adjusted by PID closed loop and condensing water flow is accurately controlled on a certain amount of, reaches the mesh accurately adjusted
's.The existing throttling fm capacity of unit can also be made full use of simultaneously, minimizes the amplitude of condensing water flow fluctuation, is reduced
Condensed water assists frequency modulation to deaerator level, condenser water level, each low-pressure heater water level regulation and condensate system pressure
Disturbance.
In terms of deaerator level controls recovery adjusting, when control mode is condensed water auxiliary movement, locking deoxygenation first
The output of the main PID of device water level regulation control, allows it not change during entire condensed water assists frequency modulation.
When mains frequency restores normal, is added by water pitch on standard-sized sheet oxygen-eliminating device and add positively biased to Condensate Pump Frequency Conversion device
The mode set increases condensing water flow to oxygen-eliminating device.Specifically, deaerator level and default water after being restored according to mains frequency
Position judges whether to need to eliminate deaerator level deviation, adjust if deaerator level adjusting is then switched to Condensate Pump Frequency Conversion
The frequency of Condensate Pump Frequency Conversion device is added a positive bias 5Hz, fast quick-recovery deaerator level by mode；When deaerator level is extensive
When again near setting value (actual water level and the absolute value of setting water level difference are in ± 30mm), by the frequency of condensed water frequency converter
Rate biasing reverts to " 0 ", and then deaerator level is adjusted to the output locking release of main PID, restore Condensate Pump Frequency Conversion water transfer
Position control.
It is such that the joint regulative mode for reducing water level bias adjustment, then turning to closed loop adjusting is set using first open loop biasing,
With it is traditional all by PID bunch grade adjustment deaerator level compared with, reduce since condensed water auxiliary frequency modulation causes deaerator level
Decline excessive, the recovery water levelx adjustment process time, while avoiding causing the high protection act of deaerator level since overshoot is excessive
Risk, will not cause water level regulation shake risk；Oxygen-eliminating device water adjusting recovery time is short simultaneously, and control is safe and reliable.
Based on same inventive concept, the invention also discloses a kind of condensed waters unidirectionally accurately controlled to assist frequency modulation control
System, comprising:
Obtain module, the unit operating parameter for changing forward and backward for obtaining mains frequency；
First computing module, for calculating the acting that current unit throttling frequency modulation increases direction according to the unit operating parameter
Capacity limit and the condensing water flow for needing to change；
Judgment module, for increasing the acting capacity limit and unit primary frequency modulation need in direction according to current unit throttling frequency modulation
It asks and judges whether to trigger condensed water auxiliary frequency modulation function, if then carrying out in next step, otherwise without adjusting；
Second computing module, for according to the condensing water flow for needing to change, current unit load and specified negative
Condensed water calculates the override amount of water pitch on oxygen-eliminating device to oxygen-eliminating device design discharge under lotus；
Adjustment module, under the water pitch adjusting deaerator level mode on oxygen-eliminating device, locking deaerator level to be adjusted
The main PID of system is adjusted, and then controls oxygen-eliminating device pitch to corresponding aperture, finally by deaerator level according to the override amount
Regulating system secondary PID closed loop adjusts control condensing water flow and reaches setting value.
Specific control process:
For certain 1000MW unit, introduce the present invention can be improved for unit primary frequency modulation increase load provide it is more
Big power output.In this example, unit nominal steam temperature is 605 DEG C, and from the thermodynamic equilibrium figure of unit, it can be concluded that, unit is at full capacity
Stage oxygen-eliminating device flow of inlet water is 2050t/h, and the load point oxygen-eliminating device flow of inlet water of 50% or so rated load is 1100t/h.
Certain test data is as follows.Unit is in pressure control mode, and water supply instructs constant to coal, while stablizing 10 minutes, current machine
Group actual load is 531.2MW, determines unit under stationary conditions, and the current flow for condensing water number oxygen-eliminating device is 1104t/h, is changed
Become the opening degree instruction of the main water supply pitch of oxygen-eliminating device.Instruction from 25% be down to 15%, the 15s time after, condensing water flow drops to
523t/h, unit load rise to 539.2MW.Unit actual load rises 8MW.Condensing water flow reduces 1104-523=
581t/h.And so on if condensed water pitch is all closed at this time, the flow of condensed water to oxygen-eliminating device is reduced to 0.Then
Unit load increment is (1102/581) × 8=15.17MW.The test load of requirement of the primary frequency modulation test of 1000MW is
0.1083Hz corresponds to 30MW；The normal AGC adjustable range of unit is 55%Pe-100%Pe.That is in unit operation
AGC controls minimum load point, and condensed water auxiliary frequency modulation maximum can provide the primary frequency modulation demand power output of half or so.In addition
The throttling frequency modulation function of unit itself itself.It is hopeful to reach primary frequency modulation check requirements completely.With the increase of unit load,
The flow of condensed water to oxygen-eliminating device can also be increase accordingly in normal course of operation.Door reduction condensation is adjusted by closing deaerator level
The amplitude of flow of water to oxygen-eliminating device also will increase, and the ability of condensed water auxiliary frequency modulation is also increase accordingly.When stage at full capacity, just
Often when operation condensed water to oxygen-eliminating device condensing water flow in 2000t/h or more, if this is the full condensed water that closes to oxygen-eliminating device tune
Section door, unit load will increase (2000/581) × 8=27.5MW or more, and auxiliary fm capacity is bigger.
Power grid will monthly carry out the primary frequency modulation examination of every unit, if test failure, according to unit capacity
Etc. factors difference, examination is differed tens of thousands of to ten or twenty ten thousand every time.For many units for the economical consideration that generates electricity, balance is primary
The pros and cons of frequency modulation examination and unit generation economy, usually can all maintain the method for operation of low throttling.Lead to unit primary frequency modulation
Almost monthly all examined.After this patent wide popularization and application, such unit primary frequency modulation responding ability can be greatly improved.It mentions
High unit generation economy, while the interference rejection ability of entire power grid is improved, there are great economy and society to be worth.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of condensed water auxiliary frequency modulation control method unidirectionally accurately controlled, it is characterised in that: comprise the following processes:
Unit operating parameter is obtained, the unit operating parameter includes steam pressure, vapor (steam) temperature and steam turbine flow；
Primary frequency modulation demand is calculated according to the unit operating parameter, current unit throttling frequency modulation increases the acting ability pole in direction
Limit and the condensing water flow for needing to change；
Increase the acting capacity limit in direction according to current unit throttling frequency modulation and primary frequency modulation demand judges whether triggering condensation
Water assists frequency modulation function, if then carrying out in next step, otherwise without adjusting；
It is designed according to condensed water to oxygen-eliminating device under condensing water flow, current unit load and the rated load for needing to change
The override amount of water pitch on flow rate calculation oxygen-eliminating device；
Water pitch is adjusted under deaerator level mode on oxygen-eliminating device, and the main PID of locking deaerator level regulating system is adjusted, then
Oxygen-eliminating device pitch is controlled to corresponding aperture, finally by deaerator level regulating system secondary PID closed loop according to the override amount
It adjusts control condensing water flow and reaches setting value.
2. a kind of condensed water auxiliary frequency modulation control method unidirectionally accurately controlled according to claim 1, it is characterised in that:
The detailed process that current unit throttling frequency modulation increases the acting capacity limit in direction is calculated according to the unit operating parameter are as follows:
Every 1% steam turbine changes in flow rate under primary frequency modulation demand and nominal steam temperature is calculated according to the unit operating parameter
Caused load variations amount；
According to load variations meter caused by 1 DEG C of vapor (steam) temperature of the primary frequency modulation demand and every variation, every 1% changes in flow rate
Calculate the maximum value and pressure correcting coefficient of current unit throttling frequency modulation；
Unit under any operating condition is calculated according to the maximum value of the current unit throttling frequency modulation and the pressure correcting coefficient
The frequency modulation that throttles increases the acting capacity limit in direction.
3. a kind of condensed water auxiliary frequency modulation control method unidirectionally accurately controlled according to claim 2, it is characterised in that:
The calculation formula of the primary frequency modulation demand are as follows:
ΔW1=Wf/S；
Wherein, WfFor current unit load corresponding operating pressure P and nominal steam temperature TeAfter tubine flow increases S%
Actual power incrementss；
The calculation formula of load variations amount caused by 1 DEG C of vapor (steam) temperature of every decline, every 1% changes in flow rate are as follows:
ΔW2=[Wf(Wf- Wt)/ΔT]·ΔW1/Wf；
Wherein, Δ T=Te-Tt, TtTo generate changed power WtVapor (steam) temperature, TeFor nominal steam temperature, WtFor uniform pressure P
Under, when temperature deviation is T DEG C of Δ, steam turbine flow increases unit actual power changing value after S%.
4. a kind of condensed water auxiliary frequency modulation control method unidirectionally accurately controlled according to claim 3, it is characterised in that:
The calculation formula of the maximum value of throttling frequency modulation under the current unit steam pressure P are as follows:
ΔWmax=(100-TF)·ΔW2·[Wf-(Wf- Wt)·(Te-T)/ΔT]·Wf；
Wherein, TeIt is given value for nominal steam temperature, T is current steam temperature, TFFor flow before steam turbine frequency modulation, WtFor
Under uniform pressure P, and nominal steam temperature deviation be T DEG C of Δ when, steam turbine flow increase S% after unit actual power change
Value；
The calculation formula of the pressure correcting coefficient are as follows:
Kp=[Wf-(Wf-Wf2)·(P-Px)/ΔP]/Wf；
Wherein, Δ P=P-Pe, P is to generate changed power WfSteam pressure, PeTo generate changed power Wf2Steam pressure, Px
For any pressure, Wf2Under operating condition for deviation delta P, nominal steam temperature and steam turbine flow increase unit actual power after S%
Changing value.
5. a kind of condensed water auxiliary frequency modulation control method unidirectionally accurately controlled according to claim 4, it is characterised in that:
Under any operating condition, unit throttling frequency modulation increases the calculation formula of the acting capacity limit in direction are as follows:
ΔWmax2=Δ Wmax·Kp；
Wherein, Δ WmaxFor steam pressure P, vapor (steam) temperature T, steam turbine flow TFUnder, the maximum value of unit throttling frequency modulation, KpFor pressure
Power correction factor.
6. a kind of condensed water auxiliary frequency modulation control method unidirectionally accurately controlled according to claim 5, it is characterised in that:
The calculation formula of the condensing water flow for needing to change are as follows:
Fn=η (Δ W1Δ Wmax2)；
Wherein, FnTo need the condensing water flow changed, η is condensing water flow variation coefficient, and value is unit condensing water flow
The ratio of reduction amount and the unit load increment of generation；ΔW1For primary frequency modulation demand, Δ Wmax2For current unit throttling frequency modulation
Increase the acting capacity limit in direction.
7. a kind of condensed water auxiliary frequency modulation control method unidirectionally accurately controlled according to claim 6, it is characterised in that:
The acting capacity limit that the current unit throttling frequency modulation of basis increases direction judges whether to trigger the condition of frequency modulation function are as follows:
If meeting Δ W1Δ Wmax2> 0 then triggers auxiliary frequency modulation function, does not otherwise trigger frequency modulation function；
Wherein, Δ W1For primary frequency modulation demand, Δ Wmax2Increase the acting ability pole in direction for unit throttling frequency modulation under current working
Limit.
8. a kind of condensed water auxiliary frequency modulation control method unidirectionally accurately controlled according to claim 7, it is characterised in that:
The calculation formula of the override amount are as follows:
Q=[1-We/W·(Fn/Yn)]·100；
WeUnit actual load before assisting frequency modulation for condensed water, W are unit rated load, YnTo be condensed under unit rated load
Water is to oxygen-eliminating device design discharge.
9. a kind of condensed water auxiliary frequency modulation control method unidirectionally accurately controlled according to any one of claims 1 to 8, special
Sign is: further include following process:
Deaerator level and preset water level after being restored according to mains frequency judge whether to need to eliminate deaerator level deviation, if
Be, by deaerator level adjusting be switched to Condensate Pump Frequency Conversion shaping modes, by the frequency of Condensate Pump Frequency Conversion device add one just
Biasing is with fast quick-recovery deaerator level until oxygen-eliminating device actual water level and water level settings value deviation are within setting range, then
The frequency offset of condensed water frequency converter is reverted into " 0 ", deaerator level is finally adjusted to the output locking release of main PID, it is extensive
Multiple condensed water frequency conversion tune water level control.
10. a kind of condensed water auxiliary frequency-modulation control system unidirectionally accurately controlled, it is characterised in that: include:
Module is obtained, for obtaining unit operating parameter；
First computing module, for calculating the acting ability that current unit throttling frequency modulation increases direction according to the unit operating parameter
The limit and the condensing water flow for needing to change；
Judgment module, for being sentenced according to the acting capacity limit and unit primary frequency modulation demand in current unit throttling frequency modulation increasing direction
It is disconnected whether to trigger condensed water auxiliary frequency modulation function, if then carrying out in next step, otherwise without adjusting；
Second computing module, for according under the condensing water flow for needing to change, current unit load and rated load
Condensed water calculates the override amount of water pitch on oxygen-eliminating device to oxygen-eliminating device design discharge；
Adjustment module, for being latched deaerator level regulating system under the water pitch adjusting deaerator level mode on oxygen-eliminating device
Main PID is adjusted, and is then controlled oxygen-eliminating device pitch to corresponding aperture according to the override amount, is adjusted finally by deaerator level
System secondary PID closed loop adjusts control condensing water flow and reaches setting value.
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| CN113819070A (en) * | 2020-10-30 | 2021-12-21 | 湖北华电江陵发电有限公司 | Frequency conversion optimization energy-saving method and system for condensate pump of steam turbine set |
| CN112327624A (en) * | 2020-11-06 | 2021-02-05 | 西安交通大学 | Peak-shaving operation method for coal-fired unit |
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| CN113483319A (en) * | 2021-07-08 | 2021-10-08 | 西安热工研究院有限公司 | Variable-frequency energy-saving optimization control system and method for condensate pump of thermal power generating unit |
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| CN113790438B (en) * | 2021-08-06 | 2024-03-01 | 神华神东电力有限责任公司 | Method and device for switching operation mode of condensate system |
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