CN105134310B - Primary frequency modulation method for correcting valve flow characteristic deviation - Google Patents
Primary frequency modulation method for correcting valve flow characteristic deviation Download PDFInfo
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Abstract
The invention relates to a primary frequency modulation method for correcting valve flow characteristic deviation, which comprises the following steps: resolving an original primary frequency modulation function curve into four function curves, including a positive frequency modulation function curve, a negative frequency modulation function curve, a positive valve opening correction factor curve and a negative valve opening correction factor curve, wherein the positive and negative frequency modulation function curves are corresponding to the valve opening value of the frequency modulation load, and the positive and negative valve opening correction factor curves are corresponding to the correction factor; multiplying the valve opening value and the correction factor to obtain an accurate valve opening variation corresponding to the frequency modulation increment, and adding the valve opening variation to the original valve opening value to increase or reduce the valve opening value, thereby enhancing or lowering the steam inlet amount and further increasing the generating load of the set. The accurate sectionlization on the original primary frequency modulation function curve and the overall process correction on the valve opening correction factor are performed to effectively enhance the primary frequency modulation property.
Description
Technical field
The application is related to a kind of optimization method of raising unit primary frequency modulation performance, specifically for valve flow characteristic
Primary frequency modulation performance is unstable caused by deviation is big, the FM Function of primary frequency modulation is effectively segmented, by valve opening
Coefficient amendment reach optimization primary frequency modulation performance purpose.
Background technology
It is mutual in extra-high voltage grid and large regional grid with the continuous increase of new-energy grid-connected, load growth and electrical network scale
Under the new situation, day by day closely, the requirement of cooperation also more and more higher, nets factory to grid contacts at different levels to connection between electrical network and unit
Primary frequency modulation in coordination function becomes one of effective means of stable electrical network.Generating set primary frequency regulation function is turbine generator
The intrinsic function of unit, mainly adjusts door by adjusting the vapour that enters of DEH systems, using boiler heat storage, occurs in electrical network different
In the case of often, the requirement of quick response electrical network, electric power grid frequency stabilization, to make up network load gap, maintains the safety of electrical network.
Electrical network wave amplitude last week changes the shorter small component of less, variable cycle, mainly by Turbo-generator Set itself
Regulating system adjust automatically steam turbine pitch complete, this process is primary frequency modulation.Primary frequency function in DEH be by
Steam turbine actual speed is converted into power signal compensation by conversion with the difference of rated speed or valve flow compensation is added to
On steam turbine valve output order.For the primary frequency modulation technical requirements of generating set must are fulfilled for the Q/GDW of national grid
669-2011《Thermal power generation unit primary frequency modulation test guidance》, when frequency changes, speed governor droop (δ) is 4% to unit
～5%, as long as the load variations amount that correspondence frequency difference is calculated in the case of the load that steam turbine increases is met known to diversity factor, machine
The primary frequency modulation of group meets grid requirements.In fact, our diversity factors required in test be local spin not
Etc. rate.Frequency modulation increment positive under same load section is inconsistent with the frequency modulation increment of negative sense in practical operation, by a frequency modulation
Function amendment cannot meet the regulatory requirements of primary frequency modulation.
The control function framework of unit primary frequency modulation is substantially that one kind simply has poor linear regulation, i.e., according to grid-connected phase
The technical requirements for closing file arrange corresponding frequency modulation amount static function in load control logic, do not exist in view of fired power generating unit
The dynamic characteristic of running and the change of operational factor, it is different that existing primary frequency modulation control strategy does not fully take into account unit
The concordance of the parameter responding ability of frequency modulation next time, causes primary frequency modulation response amplitude not enough or adjusts excessive, main cause
The amplitude of variation for being primary frequency modulation is a response under the nominal parameter of unit, but in actual moving process, by unit
The impact of operational factor, the method for operation and boiler operatiopn state, causes pressure before machine not reach corresponding requirement；Other DEH
Impact of the pitch flow nonlinear characteristic to unit primary frequency modulation performance often makes one to ignore, and many units are due to failing rule in net
Model, valve flow compensating curve of periodically adjusting cause steam turbine pitch in different opening, generating set frequency modulation performance present compared with
Strong is non-linear, and incremental speed governor droop will change accordingly, makes the actual act amplitude adjusted of primary frequency modulation inadequate or produces
Overshoot, it is difficult to take into account the Primary frequency control ability of load global extent.
The content of the invention
The purpose of the application is the frequency modulation for proposing frequency modulation increment positive under a kind of same load section with solution and negative sense
The primary frequency modulation method of valve flow characteristic deviation is corrected for the purpose of increment is inconsistent.
What the purpose of the application was realized in：The primary frequency modulation method of amendment valve flow characteristic deviation is will be original
Primary frequency modulation function curve is decomposed into four function curves, and this four function curves include positive FM Function curve, and negative sense is adjusted
Frequency function curve, positive valve opening correction coefficient curves, negative sense valve opening correction coefficient curves, wherein positive FM Function
Curve, the valve opening value of negative sense FM Function curve correspondence frequency modulation load, wherein positive valve opening correction coefficient curves, negative
To valve opening correction coefficient curves correspondence correction factor, valve opening value is multiplied with correction factor, draws one accurately
The corresponding valve opening variable quantity of frequency modulation increment, is added on the basis of original valve opening value with valve opening variable quantity, then
The opening value of valve is increasedd or decreased, the air inflow of steam is improved or reduce, so as to increase the generation load of unit.
Due to implementing above-mentioned technical proposal, the application is by the accurate segmentation to original primary frequency modulation function curve and valve
The overall process amendment of door aperture correction factor, can effectively improve primary frequency modulation performance, positive negative under same load section
Lotus increment（Increase load）With negative sense load increment（Load shedding）Fm capacity that difference is caused is inconsistent carry out effectively amendment from
And reach the performance requirement of primary frequency modulation；The performance of different load section primary frequency modulation is effectively corrected, it is ensured that full load
The performance of section frequency modulation next time meets related request.The frequency modulation function of 50～100% full load section can be met by this method
Demand.Assay optimization work for primary frequency modulation reduces difficulty.
Description of the drawings：The concrete structure of the application is given by following drawings and Examples：
Fig. 1 is the primary frequency modulation method logic schematic diagram for correcting valve flow characteristic deviation.
Legend：1st, first function block, the 2, first multiplication block, 3, second function block, the 4, the 3rd functional blocks, the 5, the 4th function
Block, the 6, second multiplication block, the 7, the 3rd multiplication block, the 8, the 4th multiplication block, the 9, first adder block, the 10, second adder block, 11, subtraction
Block.
Specific embodiment：
The application is not limited by following embodiments, can be determined according to the technical scheme of the application and practical situation concrete
Embodiment.
Embodiment：As shown in figure 1, the primary frequency modulation method of amendment valve flow characteristic deviation is by original primary frequency modulation
Function curve is decomposed into four function curves, and this four function curves include positive FM Function curve, and negative sense FM Function is bent
Line, positive valve opening correction coefficient curves, negative sense valve opening correction coefficient curves, wherein positive FM Function curve, bears
To the valve opening value of FM Function curve correspondence frequency modulation load, wherein positive valve opening correction coefficient curves, negative sense valve
Aperture correction coefficient curves correspondence correction factor, valve opening value is multiplied with correction factor, show that an accurate frequency modulation increases
Corresponding valve opening variable quantity is measured, is added with valve opening variable quantity on the basis of original valve opening value, increasing adds deduct
The opening value of minor valve, improves or reduces the air inflow of steam, so as to increase the generation load of unit.
Rated speed and actual speed are made the difference in subtraction block 11 and has drawn rotating speed difference signal, rotating speed difference signal is respectively enterd
The multiplication block 2 of first function block 1 and first, by the multiplication block 2 of first function block 1 or first, draws corresponding to rotating speed difference signal
The valve opening value of frequency modulation load, the correction factor phase that valve opening value is drawn with the 3rd functional blocks 4 or the 4th functional blocks 5
Take advantage of, draw the corresponding valve opening variable quantity of accurate frequency modulation increment, then by the first adder block 9 or the second adder block 10
Be added with valve opening variable quantity, on the basis of original valve opening value, be further added by or reduce the opening value of valve, improve or
The air inflow of steam is reduced, so as to increase the generation load of unit, this sub-load increment is exactly the energy of mains frequency decline at that time
Enough recover the load incrementss required for 50Hz.
The parameter of curve of positive FM Function curve such as first function block 1, does on the occasion of process, letter through the second multiplication block 6
Number embodies the frequency modulation upper limit of+2 turns of Regulation dead-band 4% valve opening corresponding with 11.6 turns, and theoretical curve parameter is:X:2,
11.6,122,122,122;Y:0,4,4,4,4。
The negative sense FM Function curve such as parameter of curve of second function block 3, does at negative value through the first, the 3rd multiplication block 2,7
Reason, function embodies respectively the frequency modulation lower limit that function embodies -2 turns of Regulation dead-band 4% valve opening corresponding with 11.6 turns, manages
It is by parameter of curve:X:-2,-11.6,-122,-122,-122;Y:0,-4,-4,-4,-4.
3rd functional blocks correspondence forward direction FM Function curve, the 4th functional blocks correspondence negative sense valve opening correction factor is bent
Line, the 3rd functional blocks, the 4th functional blocks are embodied under different valve openings to frequency modulation increment correspondence valve opening variable quantity
Correction factor, the 3rd functional blocks, the curvilinear function of the 4th functional blocks and general parameterss are arranged can not Jing after test is adjusted
Together, here only according to the setting of same parameters domain, theoretical parameter curve is:X:0,20,30,60,100,100;Y:0,0,1.08,
1.5,1.75,1.75。
Work as rated speed（3000 turns）Made the difference by subtraction block 11 with actual speed and drawn rotating speed difference signal, respectively enterd
The multiplication block 2 of first function block 1 and first, when actual speed is lower than 3000 turns, first function block 1 starts to calculate, and has drawn one
The valve opening value of the corresponding frequency modulation load of individual speed discrepancy, the correction factor that valve opening value and the 3rd functional blocks 4 are drawn
It is multiplied, the corresponding valve opening variable quantity of accurate frequency modulation increment is drawn, by the first adder block 9 and valve opening change
Amount is added, and on the basis of original valve opening value, is further added by the aperture of valve, improves the air inflow of steam, increased unit
Generation load, this sub-load increment be exactly at that time mains frequency decline the load incrementss that can recover required for 50Hz.
Made the difference by subtraction block 11 with actual speed when 3000 turns and drawn rotating speed difference signal, respectively enter first function block
1 and first multiplication block 2, when actual speed is higher than 3000 turns, the first multiplication block 2 starts to calculate, and has drawn a speed discrepancy pair
The valve opening value of corresponding frequency modulation load is answered, the correction factor that valve opening value draws with the 4th functional blocks 5 is multiplied, draw one
The corresponding valve opening variable quantity of individual accurate frequency modulation increment, is added by the second adder block 10 with valve opening variable quantity,
On the basis of original valve opening value, then reduce the aperture of valve, reduce the air inflow of steam, the generating for reducing unit is born
Lotus, this sub-load decrement be exactly at that time mains frequency rise the load decrement that can recover required for 50Hz.
By the effective segmentation to crude oil primary frequency modulation function and the amendment of valve opening correction function, this primary frequency modulation
Improved method, the inconsistence problems of fm capacity under same load section can effectively be optimized, simultaneously for difference
The fm capacity inconsistence problems of load section can also reach the technical requirements of directive/guide, so as to greatly improve fired power generating unit once
The stability of frequency modulation, accuracy and adaptability, while many piecewise functions also improve the difficulty of primary frequency modulation optimization correction, improve
The technical specification of primary frequency modulation.
Above technical characteristic constitutes the most preferred embodiment of the application, and it has stronger adaptability and optimal enforcement effect
Really, can according to actual needs increase and decrease inessential technical characteristic to meet the needs of different situations.
Claims (5)
1. it is a kind of amendment valve flow characteristic deviation primary frequency modulation method, it is characterised in that：By original primary frequency modulation function
Curve separating is four function curves, and this four function curves include positive FM Function curve, negative sense FM Function curve, just
To valve opening correction coefficient curves, negative sense valve opening correction coefficient curves, wherein positive FM Function curve, negative sense frequency modulation
The valve opening value of function curve correspondence frequency modulation load, wherein positive valve opening correction coefficient curves, negative sense valve opening are repaiied
Positive coefficient curve correspondence correction factor, valve opening value is multiplied with correction factor, draws an accurate frequency modulation increment correspondence
Valve opening variable quantity, be added with valve opening variable quantity on the basis of original valve opening value, increased or decrease valve
Opening value, improve or reduce steam air inflow, so as to increase the generation load of unit.
2. the primary frequency modulation method of valve flow characteristic deviation is corrected as claimed in claim 1, it is characterised in that：By specified turn
Speed makes the difference in subtraction block with actual speed and has drawn rotating speed difference signal, and rotating speed difference signal respectively enters first function block and first and takes advantage of
Method block, by first function block or the first multiplication block, draws the valve opening value of the frequency modulation load corresponding to rotating speed difference signal, will
The correction factor that valve opening value draws with the 3rd functional blocks or the 4th functional blocks is multiplied, and draws an accurate frequency modulation increment pair
The valve opening variable quantity answered, then be added with valve opening variable quantity by the first adder block or the second adder block, original
On the basis of valve opening value, the opening value of valve is further added by or is reduced, the air inflow of steam is improved or reduce, so as to increase unit
Generation load, this sub-load increment be exactly at that time mains frequency decline the load incrementss that can recover required for 50Hz.
3. the primary frequency modulation method of valve flow characteristic deviation is corrected as claimed in claim 2, it is characterised in that：Positive frequency modulation
The parameter of curve of function curve such as first function block, does on the occasion of process through the second multiplication block, and function embodies+2 turns of frequency modulation
The frequency modulation upper limit of dead band 4% valve opening corresponding with 11.6 turns, theoretical curve parameter is:X:2,11.6,122,122,122;Y:0,
4,4,4,4。
4. the primary frequency modulation method of valve flow characteristic deviation is corrected as claimed in claim 2, it is characterised in that：Negative sense frequency modulation
Function curve such as second function block parameter of curve, does negative value and processes through the first, the 3rd multiplication block, and function embodies respectively function
The frequency modulation lower limit of -2 turns of Regulation dead-band 4% valve opening corresponding with 11.6 turns is embodied, theoretical curve parameter is:X:-2,-
11.6,-122,-122,-122;Y:0,-4,-4,-4,-4。
5. the primary frequency modulation method of valve flow characteristic deviation is corrected as claimed in claim 2, it is characterised in that：3rd function
Block correspondence forward direction FM Function curve, the 4th functional blocks correspondence negative sense valve opening correction coefficient curves, the 3rd functional blocks, the 4th
Functional blocks are embodied under different valve openings to the correction factor of frequency modulation increment correspondence valve opening variable quantity, the 3rd function
Block, the curvilinear function of the 4th functional blocks and general parameterss are arranged can be different Jing after test is adjusted, here only according to same ginseng
Number field is arranged, and theoretical parameter curve is:X:0,20,30,60,100,100;Y:0,0,1.08,1.5,1.75,1.75.
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| CN106325077B (en) * | 2016-11-17 | 2019-11-05 | 贵州电网有限责任公司电力科学研究院 | A kind of steam turbine load fluctuation on-line monitoring method based on steam flow judgement |
| CN109472047B (en) * | 2018-09-28 | 2023-05-23 | 大唐东北电力试验研究院有限公司 | Valve management function determining method based on reverse iteration |
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| US4007597A (en) * | 1975-09-30 | 1977-02-15 | Westinghouse Electric Corporation | Power plant and system for accelerating a cross compound turbine in such plant, especially one having an HTGR steam supply |
| US4403476A (en) * | 1981-11-02 | 1983-09-13 | General Electric Company | Method for operating a steam turbine with an overload valve |
| JP2004011608A (en) * | 2002-06-11 | 2004-01-15 | Toshiba Corp | Steam valve controlling method and device |
| CN102606227B (en) * | 2012-03-26 | 2014-10-01 | 上海迪吉特控制系统有限公司 | Multi-objective optimization method of initial pressure fixed value of uniform-admission turbine |
| CN103743560B (en) * | 2014-01-14 | 2016-08-17 | 国家电网公司 | The test of Steam Turbine high voltage adjusting valve discharge characteristic and setting method |
| CN103900821A (en) * | 2014-04-22 | 2014-07-02 | 国家电网公司 | Primary frequency modulation function optimization experiment method of generator set |
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