CN105678105B - The online evaluation method and apparatus of steam turbine Primary frequency control ability - Google Patents
The online evaluation method and apparatus of steam turbine Primary frequency control ability Download PDFInfo
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- CN105678105B CN105678105B CN201610216989.9A CN201610216989A CN105678105B CN 105678105 B CN105678105 B CN 105678105B CN 201610216989 A CN201610216989 A CN 201610216989A CN 105678105 B CN105678105 B CN 105678105B
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Abstract
The invention discloses a kind of online evaluation methods of steam turbine Primary frequency control ability, including：The current main steam pressure and current regulating valve aperture of steam-turbine unit operation are obtained in real time；According to the control valve opening under the specified main steam pressure of the steam-turbine unit and the relationship between corresponding Primary frequency control ability, calculate the Primary frequency control ability obtained under the corresponding specified main steam pressure of current regulating valve aperture, wherein, the Primary frequency control ability is the load increment that steam-turbine unit steps to standard-sized sheet by corresponding to control valve opening；According to the relationship of main steam pressure and Primary frequency control ability, by the Primary frequency control ability amendment under the specified main steam pressure to the corresponding Primary frequency control ability of the current main steam pressure, it is determined as current Primary frequency control ability.Using online evaluation method provided by the invention, economy and the safety of operation of power networks are improved.The invention also discloses a kind of online evaluation devices of steam turbine Primary frequency control ability.
Description
Technical field
The present invention relates to steam turbine operation control technology fields, more specifically to a kind of steam turbine primary frequency modulation energy
The online evaluation method of power further relates to a kind of online evaluation device of steam turbine Primary frequency control ability.
Background technology
Currently, the UHV transmission line of large capacity lands one by one in China, it is strong promote it is national can source interconnection, but
If there is power transmission failures such as direct current transportation lockings, for electric power input province, local power shortage can suddenly substantially
Degree increases, and mains frequency will suddenly decline.At this time if the primary frequency function of fired power generating unit plays a role by design, will reduce
The amplitude that mains frequency declines, reduces the influence of accident, therefore the accurate online Primary frequency control ability of fired power generating unit and true grasped
Protecting its normal plays a role just seems particularly significant.Primary frequency control ability is a kind of ability that generating set should have, generally
It is to be completed by generating set governing system, changes and carry out automatically the load adjustment of unit with mains frequency.
In recent years, throttling has become the main distribution way of steam of super (super-) critical power generator turbine with vapour, and vapour is matched in so-called throttling,
It refer to a kind of distribution way of steam that all regulating valves of steam turbine are adjusted steam turbine throttle flow with same aperture.Theory point
Analysis shows for large-size steam turbine that control valve opening is bigger, and performance driving economy is better with test result, but primary
Fm capacity is poorer.In actual motion, the operating condition of generating set changes at any time, thus its Primary frequency control ability
Meeting therefore and off-design value.And then the effect for reducing mains frequency fall cannot be played effectively by design, easily thus make
At accident so that the safety of operation of power networks reduces.
In conclusion how to efficiently solve throttling with power grid caused by vapour steam turbine Primary frequency control ability off-design value
The problems such as safety in operation is poor is current those skilled in the art's urgent problem.
Invention content
In view of this, first of the present invention is designed to provide a kind of online evaluation side of steam turbine Primary frequency control ability
Method, this method can efficiently solve the problem that safe operation of electric network is poor caused by Primary frequency control ability off-design value,
Second object of the present invention is to provide a kind of online evaluation device of steam turbine Primary frequency control ability.
In order to reach above-mentioned first purpose, the present invention provides the following technical solutions：
A kind of online evaluation method of steam turbine Primary frequency control ability, including：
The current main steam pressure and current regulating valve aperture of steam-turbine unit operation are obtained in real time；
According to the control valve opening and corresponding Primary frequency control ability under the specified main steam pressure of the steam-turbine unit it
Between relationship, calculate the Primary frequency control ability obtained under the corresponding specified main steam pressure of current regulating valve aperture, wherein described
Primary frequency control ability is the load increment that steam-turbine unit steps to standard-sized sheet by corresponding to control valve opening；
According to the relationship of main steam pressure and Primary frequency control ability, by the primary frequency modulation energy under the specified main steam pressure
Power amendment is determined as current Primary frequency control ability to the corresponding Primary frequency control ability of the current main steam pressure.
Preferably, in above-mentioned online evaluation method, the relationship according to main steam pressure and Primary frequency control ability, by institute
State the fm capacity amendment next time of specified main steam pressure to the corresponding Primary frequency control ability of the current main steam pressure, specifically
For：
Fm capacity is multiplied by the correction factor acquisition current Primary frequency control ability to the specified main steam pressure next time,
The correction factor is the ratio of the current main steam pressure and the specified main steam pressure.
Preferably, described to obtain the current main steam pressure and work as that steam-turbine unit is run in above-mentioned online evaluation method
Further include before preceding control valve opening：
The regulating valve crushing under different adjustment valve opening is obtained, and calculates the pass for obtaining control valve opening and regulating valve crushing
System；
Obtain the relationship of regulating valve crushing variation and the steam-turbine unit load variations under specified main steam pressure；
Regulating valve crushing when regulating valve standard-sized sheet is arranged is default crushing, calculates acquisition different adjustment valve opening and steps to entirely
Corresponding regulating valve crushing variation when opening, according to the relationship and the specified main steam of the control valve opening and regulating valve crushing
The relationship of regulating valve crushing variation and the steam-turbine unit load variations, determines under the specified main steam pressure under pressure
Relationship between control valve opening and corresponding Primary frequency control ability.
Preferably, in above-mentioned online evaluation method, the regulating valve crushing obtained under different adjustment valve opening, and calculate
The relationship of control valve opening and regulating valve crushing is obtained, including：
The corresponding main steam pressure of different adjustment valve opening is measured, the adjusting of steam-turbine unit when different load is obtained
Downstream pressure, regulating valve crushing are：
Δ p=(p1-pe)/p1
In formula, Δ p indicates regulating valve crushing, p1Indicate main steam pressure, peIt indicates to adjust downstream pressure；
It is fitted the relationship of adjusted valve crushing and control valve opening.
Preferably, in above-mentioned online evaluation method, the adjusting downstream pressure of the steam-turbine unit, specially：
In formula, peIt indicates to adjust downstream pressure, NgIndicate steam-turbine unit load, TeTemperature after expression regulating valve, pe0It indicates
Adjusting downstream pressure under rated load, all regulating valve full-gears, Ng0Indicate rated load, all regulating valve full-gears
Under steam-turbine unit load, Te0Temperature after regulating valve under expression rated load, all regulating valve full-gears.
Preferably, described to obtain the variation of regulating valve crushing and institute under specified main steam pressure in above-mentioned online evaluation method
The relationship of steam-turbine unit load variations is stated, including：
Carry out the step experiment under different adjustment valve opening, obtain the front and back main steam pressure of experiment, control valve opening and
Steam-turbine unit load；
The front and back steam-turbine unit load of experiment is corrected respectively to the steam turbine machine corresponded under specified main steam pressure
Group load；
According to the relationship of control valve opening and regulating valve crushing, calculates and obtain different adjustment valve opening step correspondence
Regulating valve crushing changes, and fitting obtains different adjustment valve crushing and changes corresponding main steam pressure tubine unit load variation
Relationship.
Preferably, in online evaluation method, the ranging from 2%-3% of the default crushing.
When using steam turbine Primary frequency control ability online evaluation method provided by the invention, according to the steam turbine obtained in real time
The current main steam pressure and current regulating valve aperture of unit operation are opened by calculating acquisition steam-turbine unit by current regulating valve
Degree steps to the corresponding load increment of standard-sized sheet, i.e. changed power, obtains current Primary frequency control ability in real time.It is not influencing thus
In the case of unit normal operation, the high-precision online evaluation for completing steam-turbine unit Primary frequency control ability, steam turbine machine
Group can adjust steam turbine operation parameter in real time according to assessment result, it is ensured that and the Primary frequency control ability of unit meets prescribed requirement, and
So that steam turbine is increased control valve opening as far as possible while meeting primary frequency modulation requirement, improves performance driving economy.Meanwhile electricity
Power traffic department can also monitor the Primary frequency control ability of grid-connected unit in real time, more reasonably arrange power generation, improve electricity
The safety of network operation.
In order to reach above-mentioned second purpose, the present invention also provides a kind of online evaluations of steam turbine Primary frequency control ability
Device.
A kind of online evaluation device of steam turbine Primary frequency control ability, including：
Acquisition module, current main steam pressure and current regulating valve aperture for obtaining steam-turbine unit operation in real time；
Computing module, for according to the control valve opening and corresponding one under the specified main steam pressure of the steam-turbine unit
Relationship between secondary fm capacity calculates the primary frequency modulation energy obtained under the corresponding specified main steam pressure of current regulating valve aperture
Power, wherein the Primary frequency control ability is the load increment that steam-turbine unit steps to standard-sized sheet by corresponding to control valve opening；
Correcting module, for the relationship according to main steam pressure and Primary frequency control ability, by the specified main steam pressure
Under Primary frequency control ability amendment to the corresponding Primary frequency control ability of the current main steam pressure, be determined as current primary frequency modulation
Ability.
Preferably, in above-mentioned line apparatus for evaluating, the correcting module is used for specified main steam pressure frequency modulation next time
Ability is multiplied by correction factor and obtains current Primary frequency control ability, and the correction factor is the current main steam pressure and the volume
Determine the ratio of main steam pressure.
Preferably, in above-mentioned line apparatus for evaluating, further include：
First acquisition module for obtaining the regulating valve crushing under different adjustment valve opening, and calculates acquisition regulating valve and opens
The relationship of degree and regulating valve crushing；
Second acquisition module, it is negative for obtaining the variation of regulating valve crushing and the steam-turbine unit under specified main steam pressure
The relationship of lotus variation；
Processing module is default crushing for regulating valve crushing when regulating valve standard-sized sheet is arranged, calculates and obtain different adjustment
Valve opening steps to corresponding regulating valve crushing variation when standard-sized sheet, according to the relationship of the control valve opening and regulating valve crushing and
The relationship of regulating valve crushing variation and the steam-turbine unit load variations, determines described specified under the specified main steam pressure
The relationship between control valve opening and corresponding Primary frequency control ability under main steam pressure.
It is high-precision to complete primary tune using the online evaluation device of steam turbine Primary frequency control ability provided by the invention
The online evaluation of frequency ability improves safe operation of electric network.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of flow of specific implementation mode of steam turbine Primary frequency control ability online evaluation method provided by the invention
Schematic diagram；
Fig. 2 is that the Steam Turhine Adjustment valve opening of 1000MW supercritical turbine units and the relation curve of crushing are illustrated
Figure；
The pass of the variation of turbine governor valve crushing and unit load variation of Fig. 3 1000MW supercritical turbine units
It is curve synoptic diagram；
Fig. 4 is the Steam Turhine Adjustment valve opening of 1000MW supercritical turbine units and the relationship song of Primary frequency control ability
Line schematic diagram；
In Fig. 2-Fig. 3, ● test data is represented, --- represent the fitting result according to test data；In Fig. 4, --- generation
Table steam turbine Primary frequency control ability assessment result.
Specific implementation mode
The embodiment of the invention discloses a kind of steam turbine Primary frequency control ability online evaluation methods, to assess steam turbine in real time
Primary frequency control ability when normal operation improves the safety of operation of power networks.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, Fig. 1 is a kind of specific implementation of steam turbine Primary frequency control ability online evaluation method provided by the invention
The flow diagram of mode.
In a specific embodiment, steam turbine Primary frequency control ability online evaluation method provided by the invention, is used for
Vapour steam turbine is matched in throttling, is included the following steps：
S1：The current main steam pressure and current regulating valve aperture of steam-turbine unit operation are obtained in real time；
In steam-turbine unit operational process, the current main steam pressure p of on-line measurement unit1With current regulating valve aperture
Ψ, refer to the prior art for specific measuring device and method, and details are not described herein again.
S2：According to the specified main steam pressure of steam-turbine unit next time between fm capacity and corresponding control valve opening
Relationship calculates and obtains the corresponding specified main steam pressure of current regulating valve aperture fm capacity next time, wherein primary frequency modulation energy
Power is that steam-turbine unit steps to the corresponding load increment of standard-sized sheet by different adjustment valve opening；
When according to specified main steam pressure, the relationship of Primary frequency control ability and control valve opening, that is, primary frequency modulation energy
Power with control valve opening variation relation, when specifically can be according to the specified main steam pressure obtained in advance, steam-turbine unit
The corresponding load increment Δ N of standard-sized sheet is stepped to by different adjustment valve opening ΨgWith the relationship of corresponding control valve opening Ψ, such as load
Increment Delta NgWith control valve opening Ψ change curves ψ-Δ NgCurve or load increment Δ NgWith the variation of control valve opening Ψ
Function, when main steam pressure is calculated, current regulating valve aperture steps to the corresponding load increment of standard-sized sheet.That is main steam pressure
When, the corresponding Primary frequency control ability of current regulating valve aperture.
S3：According to the relationship of main steam pressure and Primary frequency control ability, by specified main steam pressure fm capacity next time
It corrects to the corresponding Primary frequency control ability of current main steam pressure, is determined as current Primary frequency control ability.
According to the corresponding Primary frequency control ability of current regulating valve aperture under the main steam pressure of acquisition, in conjunction with main steam pressure
With the relationship of Primary frequency control ability, the Primary frequency control ability under specified main steam pressure is modified, corrects and obtains current master
The corresponding Primary frequency control ability of steam pressure is simultaneously determined as current Primary frequency control ability.It is, turbine governor valve is from current
Aperture steps to the corresponding load increment of standard-sized sheet and regards the maximum primary frequency modulation load that unit can provide as, as machine
The current Primary frequency control ability of group.
When using throttling provided by the invention with vapour steam turbine Primary frequency control ability online evaluation method, obtained according to real-time
Steam-turbine unit operation current main steam pressure and current regulating valve aperture, through calculating obtain steam-turbine unit by current
Control valve opening steps to the corresponding load increment of standard-sized sheet, i.e. changed power, obtains current Primary frequency control ability in real time.Thus
In the case where not influencing unit normal operation, the high-precision online evaluation for completing steam-turbine unit Primary frequency control ability,
Steam-turbine unit can adjust steam turbine operation parameter in real time according to assessment result, it is ensured that the Primary frequency control ability of unit meets rule
Provisioning request, and steam turbine is made to increase control valve opening as far as possible while meeting primary frequency modulation requirement, improve economical operation
Property.Meanwhile electric dispatching department can also monitor the Primary frequency control ability of grid-connected unit in real time, more reasonably arrange electric power life
Production, improves the safety of operation of power networks.
Specifically, according to the relationship of main steam pressure and Primary frequency control ability, by specified main steam pressure frequency modulation next time
Capacity correction to the corresponding Primary frequency control ability of current main steam pressure can be：Specified main steam pressure fm capacity next time
It is multiplied by correction factor and obtains current Primary frequency control ability, correction factor is current main steam pressure and determines the ratio of main steam pressure
Value.The relationship of main steam pressure and Primary frequency control ability matches vapour steam turbine for throttling, when actual motion, unit load with
Main steam pressure direct proportionality, thus correction factor p can be obtained1/p10, wherein p1Indicate current main steam pressure, p10
Indicate specified main steam pressure.Primary frequency control ability when specified main steam pressure and correction factor p1/p10Product, as vapour
Current Primary frequency control ability when turbine actual motion.
Further, before the current main steam pressure and current regulating valve aperture for obtaining steam-turbine unit operation in real time
Further include：Obtain the relationship between control valve opening and corresponding Primary frequency control ability under specified main steam pressure.Namely in advance
Obtain specified main steam pressure next time fm capacity with control valve opening variation relation, and then in real time assessment primary frequency modulation
As basis for estimation when ability.Specifically, may include steps of：
S01：The regulating valve crushing under different adjustment valve opening is obtained, and calculates and obtains control valve opening and regulating valve crushing
Relationship；
S02：Obtain the relationship of regulating valve crushing variation and steam-turbine unit load variations under specified main steam pressure；
S03：Regulating valve crushing when regulating valve standard-sized sheet is arranged is default crushing, calculates and obtains different adjustment valve opening step
Corresponding regulating valve crushing variation when to standard-sized sheet, according to the relationship and specified main steam pressure of control valve opening and regulating valve crushing
The relationship of lower regulating valve crushing variation and steam-turbine unit load variations, determine control valve opening under specified main steam pressure with
Relationship between corresponding Primary frequency control ability.
For throttling with for vapour steam turbine, difference can be calculated according to its actual motion or dedicated experiments data
Pressure (after regulating valve) before the load tubine first order, and main steam pressure is combined, pressure difference and crushing before and after adjusted valve,
Corresponding different control valve opening, the relationship of adjusted valve opening and crushing.It is tested and is tied according to practical adjustments valve opening step
Fruit obtains the relationship of the variation of different adjustment valve crushing and unit load variation, and is adapted to nominal steam parameter.Vapour vapour is matched in throttling
Turbine regulating valve is typically in throttle operation, thus unit has certain Load Regulation allowance, and turbine governor valve is from right
It is the maximum primary frequency modulation load that unit can provide, as the one of unit to answer aperture to step to the corresponding load increment of standard-sized sheet
Secondary fm capacity.Control valve opening when according to steam turbine operation, adjusted valve crushing and the crushing dashed forward when reaching standard-sized sheet
Variation, then by the relationship of crushing variation and load variations, corresponding Primary frequency control ability under arbitrary control valve opening can be obtained.
Specifically, above-mentioned steps S01 includes：
The corresponding main steam pressure of different adjustment valve opening is measured, when obtaining different load after the regulating valve of steam-turbine unit
Pressure, regulating valve crushing (including stop valve herein) are：
Δ p=(p1-pe)/p1
In formula, Δ p indicates regulating valve crushing, p1Indicate main steam pressure, peIt indicates to adjust downstream pressure；
It is fitted the relationship of adjusted valve crushing and control valve opening.
Further, the adjusting downstream pressure of steam-turbine unit, can specifically be calculated as follows adjusting when obtaining different load
Downstream pressure：
In formula, peIt indicates to adjust downstream pressure, NgIndicate steam-turbine unit load, TeTemperature after expression regulating valve, pe0It indicates
Adjusting downstream pressure under rated load, all regulating valve full-gears, Ng0Indicate rated load, all regulating valve full-gears
Under steam-turbine unit load, Te0Temperature after regulating valve under expression rated load, all regulating valve full-gears.Namely
pe、Ng、TeIndicate the parameter value under different load, and subscript " 0 " is used for indicating " rated load, all regulating valve standard-sized sheets " state
Under corresponding each parameter value.
When due to Steam Turbine actual motion, unit load NgChange with main steam flow G direct proportionalities：
And by Fu Liugeer formula it is found that when unit normal operation, main steam flow and pressure p after regulating valvee, temperature Te
Relationship change as the following formula：
Main steam flow with the power of the assembling unit is characterized with perunit value in above-mentioned parameter, and the normal condition compared is exactly specified
Load, all regulating valve standard-sized sheets, the value of each parameter of the subscript " 0 " for indicating rated load, under all regulating valve full-gears,
Similarly hereinafter.Then pressure is after turbine governor valve：
It can be calculated by above-mentioned formula and obtain the corresponding adjusting downstream pressure of steam-turbine unit different load, and then obtained not
With the regulating valve crushing under control valve opening, and the relationship for obtaining control valve opening and regulating valve crushing is calculated, it specifically can be by
Operations described below carries out：
(1) normally put into Steam Turbine heat regenerative system, vacuum system normal operation in the case of, unit parameter is adjusted
To rated load, specified main steam pressure and temperature；
(2) it maintains rated load constant, main steam pressure is reduced, until turbine governor valve standard-sized sheet；
(3) it maintains main steam pressure constant, slowly reduces unit load, regulating valve turns down automatically, should generally load be made to drop
As low as 20% or less control valve opening；
(4) by formulaThe adjusting downstream pressure under different load is calculated, by formula Δ p=(p1-
pe)/p1Calculate the regulating valve crushing under different load；
(5) according to result of calculation, control valve opening-crushing corresponding points are depicted, and ψ-is fitted by the way of power
Δ p curves.
Further, above-mentioned steps S02 includes：
Carry out the step experiment under different adjustment valve opening, obtain the front and back main steam pressure of experiment, control valve opening and
Steam-turbine unit load；
The front and back steam-turbine unit load of experiment is corrected respectively to the steam turbine machine corresponded under specified main steam pressure
Group load；
According to the relationship of control valve opening and regulating valve crushing, calculates and obtain different opening regulating valve step correspondence
Regulating valve crushing changes, and determines that different adjustment valve crushing changes the pass of corresponding main steam pressure tubine unit load variation
System.
The Primary frequency control ability that steam-turbine unit is capable of providing mainly is transformed by unit accumulation of heat, steam turbine normal table
When operation, control valve opening suddenly change will necessarily cause unit electrical power Spline smoothing and continue for some time.Thus this hair
In bright, regulating valve crushing changes delta (Δ p) and unit load changes delta NgRelationship can be tested by control valve opening step
It obtains.Specific method is：
(1) unit stable operation under different typical loads such as adjusts unit operation operating mode, makes turbine governor valve point
Other places are in the different openings stable operation such as 20%, 25%, 30%, 35%, 40%, 50%；
(2) valve opening step is adjusted under each control valve opening to test, the electrical power of the front and back unit of record experiment,
The amplitude of main steam pressure and control valve opening, control valve opening step generally makes electrical power significant change and is no more than 10%
Rated power under same control valve opening, tests general carry out twice, to ensure experimental result accuracy；
(3) when constant by control valve opening, unit load this relationship directly proportional to main steam pressure will be electric before and after experiment
Value under the changing value amendment to specified main steam pressure of power；
(4) according to ψ-Δ p curves, the variation of crushing before and after control valve opening step is acquired；
(5) according to test result, the variation of electrical power when in conjunction with revised experiment is depicted under specified main steam pressure
Regulating valve crushing variation-unit load changes corresponding points, and Δ (Δ p)-Δ N is fitted by the way of lineargCurve.
By the above method obtain control valve opening and regulating valve crushing relationship and regulating valve crushing changes delta (Δ p) with
Unit load changes delta NgRelationship, further, specified main steam pressure tubine group control valve opening and primary frequency modulation
Power curve can specifically obtain by the following method：
(1) according to any aperture of turbine governor valve, the regulating valve crushing under this aperture is obtained by ψ-Δ p curves；
(2) crushing is 2.5% when taking regulating valve standard-sized sheet, and pressure of the turbine governor valve from this aperture to standard-sized sheet when is calculated
Damage variation；
(3) regulating valve Δ (Δ p)-Δ N is looked intogCurve can be obtained under specified main steam pressure, and crushing variation is corresponding negative
Lotus changes；
(4) it to regulating valve different opening, repeats the above process, Steam Turbine control valve opening and primary frequency modulation energy can be obtained
Force curve (ψ-Δ NgCurve).
To sum up, throttling can specifically include following steps with vapour steam turbine Primary frequency control ability online evaluation method：
(1) according to the current aperture ψ of running turbine governor valve, by the adjusted valve crushing Δ p of ψ-Δ p curves；
(2) crushing (including stop valve) is taken as definite value (generally desirable 2.5%) when regulating valve standard-sized sheet, and steam turbine is calculated
Crushing changes delta (Δ p) when regulating valve is from current aperture to standard-sized sheet；
(3) Δ (Δ p)-Δ N is looked intogCurve can be obtained under specified main steam pressure, when regulating valve is from current aperture to standard-sized sheet
Crushing change corresponding changed power, which is under specified main steam pressure, and current regulating valve aperture is corresponding
Primary frequency control ability；
(4) according to result above, adjusted valve opening and Primary frequency control ability relation curve (ψ-Δ NgCurve)；
(5) by unit actual motion current main steam pressure when and current regulating valve aperture, look into ψ-Δ NgCurve, according to
The Primary frequency control ability found is adapted to current operation main steam pressure by load this relationship directly proportional to main steam pressure,
This makes it possible to obtain throttlings with the online current Primary frequency control ability of vapour steam turbine.
In the above-described embodiments, crushing ranging from 2%-3% when crushing, that is, regulating valve standard-sized sheet is preset, it is general desirable
2.5%.
Specifically, vapour steam turbine (N1000- is matched in the 1000MW ultra supercriticals throttling for choosing a Shanghai steam turbine plant production
26.25/600/600) for, Primary frequency control ability assessment is carried out as stated above.
First, according to the concrete operations of above-mentioned acquisition control valve opening and the relationship of regulating valve crushing, the ψ-Δ p obtained is bent
Line, as shown in Fig. 2；
Furthermore (Δ p) is negative with unit according to acquisition regulating valve crushing changes delta is tested above by control valve opening step
Lotus changes delta NgRelationship concrete operations, obtain Δ (Δ p)-Δ NgCurve, as shown in Fig. 3；
It is obtained according to above-mentioned specified main steam pressure tubine group control valve opening and the specific of Primary frequency control ability curve
Method is taken, ψ-Δ N is obtainedgCurve, as shown in Fig. 4；
Finally, real-time online measuring obtains the current main steam pressure p of unit1, current regulating valve aperture Ψ；According to ψ-Δ
NgCurve, be calculated under current regulating valve aperture, specified main vapour pressure when Primary frequency control ability；According to current main steam pressure
Primary frequency control ability correction factor p is calculated in power1/p10；Primary frequency control ability when specified main vapour pressure and correction factor
p1/p10Current Primary frequency control ability when product, as Steam Turbine actual motion.
The invention also discloses a kind of online evaluation devices of steam turbine Primary frequency control ability, in a kind of specific implementation mode
In, including：
Acquisition module, current main steam pressure and current regulating valve aperture for obtaining steam-turbine unit operation in real time；
Computing module, for according under the specified main steam pressure of steam-turbine unit control valve opening with it is corresponding once tune
Relationship between frequency ability calculates the Primary frequency control ability obtained under the corresponding specified main steam pressure of current regulating valve aperture,
Wherein, Primary frequency control ability is the load increment that steam-turbine unit steps to standard-sized sheet by corresponding to control valve opening；
Correcting module will be under specified main steam pressure for the relationship according to main steam pressure and Primary frequency control ability
Primary frequency control ability amendment is determined as current Primary frequency control ability to the corresponding Primary frequency control ability of current main steam pressure.
Further, particularly for specified main steam pressure, fm capacity is multiplied by correction factor and obtains correcting module next time
Proper preceding Primary frequency control ability, correction factor are the ratio of current main steam pressure and specified main steam pressure.
Further, the online evaluation device of above-mentioned steam turbine Primary frequency control ability further includes：
First acquisition module for obtaining the regulating valve crushing under different adjustment valve opening, and calculates acquisition regulating valve and opens
The relationship of degree and regulating valve crushing；
Second acquisition module becomes for obtaining regulating valve crushing variation under specified main steam pressure with steam-turbine unit load
The relationship of change；
Processing module is default crushing for regulating valve crushing when regulating valve standard-sized sheet is arranged, calculates and obtain different adjustment
Valve opening steps to corresponding regulating valve crushing variation when standard-sized sheet, according to the relationship of control valve opening and regulating valve crushing and specified
The relationship of regulating valve crushing variation and steam-turbine unit load variations, determines the tune under specified main steam pressure under main steam pressure
Save the relationship between valve opening and corresponding Primary frequency control ability.
Specifically, the first acquisition module may include main steam pressure acquiring unit, for measuring different adjustment valve opening
Corresponding main steam pressure；Pressure acquiring unit after regulating valve, when for obtaining different load after the regulating valve of steam-turbine unit
Pressure, regulating valve crushing are：
Δ p=(p1-pe)/p1
In formula, Δ p indicates regulating valve crushing, p1Indicate main steam pressure, peIt indicates to adjust downstream pressure；
Fitting unit, for being fitted the relationship for obtaining regulating valve crushing and control valve opening.
The adjusting downstream pressure of steam-turbine unit, specially：
In formula, peIt indicates to adjust downstream pressure, NgIndicate steam-turbine unit load, TeTemperature after expression regulating valve, subscript
" 0 " is used for indicating the value of corresponding each parameter under " rated load, all regulating valve standard-sized sheets " state.
Further, the second acquisition module includes：
Acquiring unit, for obtaining the main steam pressure, control valve opening that step experiment is front and back under different adjustment valve opening
With steam-turbine unit load；
Amending unit is corrected respectively for that will test front and back steam-turbine unit load to corresponding to specified main steam pressure
Under steam-turbine unit load；
Processing unit calculates for the relationship according to control valve opening and regulating valve crushing and obtains different opening regulating valve
The regulating valve crushing of step correspondence changes, and determines that different adjustment valve crushing changes corresponding main steam pressure tubine machine
The relationship of group load variations.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (8)
1. a kind of online evaluation method of steam turbine Primary frequency control ability, which is characterized in that including：
The regulating valve crushing under different adjustment valve opening is obtained, and calculates the relationship for obtaining control valve opening and regulating valve crushing；
Obtain the relationship of regulating valve crushing variation and the steam-turbine unit load variations under specified main steam pressure；
Regulating valve crushing when regulating valve standard-sized sheet is arranged is default crushing, when calculating acquisition different adjustment valve opening steps to standard-sized sheet
Corresponding regulating valve crushing variation, according to the relationship and the specified main steam pressure of the control valve opening and regulating valve crushing
The relationship of lower regulating valve crushing variation and the steam-turbine unit load variations, determines the adjusting under the specified main steam pressure
Relationship between valve opening and corresponding Primary frequency control ability；
The current main steam pressure and current regulating valve aperture of steam-turbine unit operation are obtained in real time；
According to the control valve opening under the specified main steam pressure of the steam-turbine unit and between corresponding Primary frequency control ability
Relationship calculates the Primary frequency control ability obtained under the corresponding specified main steam pressure of current regulating valve aperture, wherein described primary
Fm capacity is the load increment that steam-turbine unit steps to standard-sized sheet by corresponding to control valve opening；
According to the relationship of main steam pressure and Primary frequency control ability, the Primary frequency control ability under the specified main steam pressure is repaiied
Just to the corresponding Primary frequency control ability of the current main steam pressure, it is determined as current Primary frequency control ability.
2. online evaluation method according to claim 1, which is characterized in that described according to main steam pressure and primary frequency modulation
The relationship of ability, by the specified main steam pressure fm capacity amendment next time to the current main steam pressure corresponding one
Secondary fm capacity, specially：
Fm capacity is multiplied by the correction factor acquisition current Primary frequency control ability to the specified main steam pressure next time, described
Correction factor is the ratio of the current main steam pressure and the specified main steam pressure.
3. online evaluation method according to claim 1 or 2, which is characterized in that under the acquisition different adjustment valve opening
Regulating valve crushing, and calculate obtain control valve opening and regulating valve crushing relationship, including：
The corresponding main steam pressure of different adjustment valve opening is measured, is obtained when different load after the regulating valve of the steam-turbine unit
Pressure, regulating valve crushing are：
△ p=(p1-pe)/p1
In formula, △ p indicate regulating valve crushing, p1Indicate main steam pressure, peIt indicates to adjust downstream pressure；
It is fitted the relationship of adjusted valve crushing and control valve opening.
4. online evaluation method according to claim 3, which is characterized in that pressed after the regulating valve of the steam-turbine unit
Power, specially：
In formula, peIt indicates to adjust downstream pressure, NgIndicate steam-turbine unit load, TeTemperature after expression regulating valve, pe0Indicate specified
Adjusting downstream pressure under load, all regulating valve full-gears, Ng0It indicates under rated load, all regulating valve full-gears
Steam-turbine unit load, Te0Temperature after regulating valve under expression rated load, all regulating valve full-gears.
5. online evaluation method according to claim 1 or 2, which is characterized in that described to obtain under specified main steam pressure
Regulating valve crushing changes the relationship with the steam-turbine unit load variations, including：
The step experiment under different adjustment valve opening is carried out, experiment front and back main steam pressure, control valve opening and steamer are obtained
Machine unit load；
The front and back steam-turbine unit load of experiment is corrected respectively to the steam-turbine unit corresponded under specified main steam pressure and is born
Lotus；
According to the relationship of control valve opening and regulating valve crushing, the adjusting for obtaining different adjustment valve opening step correspondence is calculated
Valve crushing changes, and fitting obtains the pass that different adjustment valve crushing changes corresponding main steam pressure tubine unit load variation
System.
6. online evaluation method according to claim 1 or 2, which is characterized in that the ranging from 2%- of the default crushing
3%.
7. a kind of online evaluation device of steam turbine Primary frequency control ability, which is characterized in that including：
Acquisition module, current main steam pressure and current regulating valve aperture for obtaining steam-turbine unit operation in real time；
Computing module, for according under the specified main steam pressure of the steam-turbine unit control valve opening with it is corresponding once tune
Relationship between frequency ability calculates the Primary frequency control ability obtained under the corresponding specified main steam pressure of current regulating valve aperture,
Wherein, the Primary frequency control ability is the load increment that steam-turbine unit steps to standard-sized sheet by corresponding to control valve opening；
Correcting module will be under the specified main steam pressure for the relationship according to main steam pressure and Primary frequency control ability
Primary frequency control ability amendment is determined as current primary frequency modulation energy to the corresponding Primary frequency control ability of the current main steam pressure
Power；
First acquisition module, for obtaining the regulating valve crushing under different adjustment valve opening, and calculate obtain control valve opening with
The relationship of regulating valve crushing；
Second acquisition module becomes for obtaining regulating valve crushing variation under specified main steam pressure with the steam-turbine unit load
The relationship of change；
Processing module is default crushing for regulating valve crushing when regulating valve standard-sized sheet is arranged, and calculates acquisition different adjustment valve and opens
Degree steps to corresponding regulating valve crushing variation when standard-sized sheet, according to the relationship of the control valve opening and regulating valve crushing and described
The relationship of regulating valve crushing variation and the steam-turbine unit load variations, determines the specified main steaming under specified main steam pressure
The relationship between control valve opening and corresponding Primary frequency control ability under steam pressure.
8. online evaluation device according to claim 7, which is characterized in that the correcting module is used for the specified main steaming
Fm capacity is multiplied by the current Primary frequency control ability of correction factor acquisition to steam pressure next time, and the correction factor is the current master
The ratio of steam pressure and the specified main steam pressure.
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| CN106300442B (en) * | 2016-09-20 | 2019-05-28 | 国网浙江省电力公司电力科学研究院 | A kind of control method of thermal power generation unit responsive electricity grid low frequency fault accommodation |
| CN106845639A (en) * | 2016-12-27 | 2017-06-13 | 国网浙江省电力公司电力科学研究院 | Steam turbine valve based on neutral net lifts the Potential Prediction method of unit load |
| CN109784711A (en) * | 2019-01-08 | 2019-05-21 | 国网新疆电力有限公司电力科学研究院 | Fired power generating unit Primary frequency control ability assessment system, method, apparatus and storage medium |
| CN110824927B (en) * | 2019-11-29 | 2022-06-03 | 江苏方天电力技术有限公司 | Thermal power generating unit primary frequency modulation accurate adjustment method with self-adaptive learning characteristic |
| CN111399448B (en) * | 2020-02-26 | 2021-09-14 | 华电电力科学研究院有限公司 | Coal-fired unit primary frequency modulation control method in steam turbine following mode |
| CN111523818B (en) * | 2020-04-28 | 2022-12-09 | 国网江西省电力有限公司电力科学研究院 | Thermal power generating unit primary frequency modulation performance evaluation method based on test information |
| CN112398144A (en) * | 2020-11-17 | 2021-02-23 | 江西大唐国际抚州发电有限责任公司 | Primary frequency modulation dynamic cooperative control method of steam turbine regulating system |
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