CN105678105A - Online evaluating method and device for primary frequency modulation capacity of turbine - Google Patents
Online evaluating method and device for primary frequency modulation capacity of turbine Download PDFInfo
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- CN105678105A CN105678105A CN201610216989.9A CN201610216989A CN105678105A CN 105678105 A CN105678105 A CN 105678105A CN 201610216989 A CN201610216989 A CN 201610216989A CN 105678105 A CN105678105 A CN 105678105A
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Abstract
The invention discloses an online evaluating method for the primary frequency modulation capacity of a turbine.The method includes the steps of obtaining the current main steam pressure of a running unit of the turbine and the current opening degree of an adjusting valve in real time; calculating the primary frequency modulation capacity under the rated main steam pressure corresponding to the current opening degree of the adjusting valve according to the relation between the adjusting valve opening degree under the rated main steam pressure of the unit of the turbine and the corresponding primary frequency modulation capacity, wherein the primary frequency modulation capacity is the load increment corresponding to the full opening degree of the adjusting valve; modifying the primary frequency modulation capacity under the rated main steam pressure into the primary frequency modulation capacity corresponding to the current main steam pressure according to the relation between the main steam pressure and the primary frequency modulation capacity, and determining the current primary frequency modulation capacity.By means of the method, the running economy and safety of a power grid are improved.The invention further discloses an online evaluating device for the primary frequency modulation capacity of the turbine.
Description
Technical field
The present invention relates to steam turbine operation control techniques field, more specifically, it relates to a kind of online evaluation method of steam turbine Primary frequency control ability, also relate to the online evaluation device of a kind of steam turbine Primary frequency control ability.
Background technology
At present, the UHV transmission circuit of Large Copacity lands one by one in China, and strong to facilitate the whole nation energy interconnected, but if there is power transmission failures such as direct-current transmission lockings, inputting province for electric power, its local power shortage can increase considerably suddenly, and electrical network frequency will suddenly decline. If now the primary frequency function of fired power generating unit plays a role by design, the amplitude of electrical network frequency decrease will be reduced, the impact of minimizing accident, therefore accurately grasp the online Primary frequency control ability of fired power generating unit and guarantee that it normally plays a role and just seem very important. Primary frequency control ability is a kind of ability that generating set should possess, and is generally complete by generating set velocity control system, automatically carries out the load adjustment of unit with electrical network change of frequency.
In recent years, the main distribution way of steam that vapour has become super (super-) critical power generator turbine is joined in throttling, and vapour is joined in so-called throttling, refers to a kind of distribution way of steam that steam turbine admission amount is regulated by all variable valve of steam turbine with same aperture. Theoretical analysis and test-results all show, for large-size steam turbine, its control valve opening is more big, and performance driving economy is more good, but Primary frequency control ability is more poor. In actual motion, the operation condition of generating set changes at any time, and thus its Primary frequency control ability also can therefore off-design value. And then the effect effectively reducing electrical network frequency decrease amplitude can not be played by design, easily thus cause the accident so that the security of operation of power networks reduces.
In sum, how effectively to solve throttling and join the problems such as safe operation of electric network that vapour steam turbine Primary frequency control ability off-design value causes is poor, be current those skilled in the art's urgent problem.
Summary of the invention
In view of this, first object of the present invention is to provide a kind of online evaluation method of steam turbine Primary frequency control ability, the method can solve the poor problem of safe operation of electric network that Primary frequency control ability off-design value causes effectively, and the 2nd object of the present invention is to provide the online evaluation device of a kind of steam turbine Primary frequency control ability.
In order to reach above-mentioned first object, the present invention provides following technical scheme:
An online evaluation method for steam turbine Primary frequency control ability, comprising:
Obtain current main steam pressure and current regulating valve aperture that steam-turbine unit runs in real time;
According to the control valve opening under the specified main steam pressure of described steam-turbine unit and the relation between corresponding Primary frequency control ability, calculate the Primary frequency control ability under specified main steam pressure corresponding to acquisition current regulating valve aperture, wherein, described Primary frequency control ability is that steam-turbine unit steps to the load increment of standard-sized sheet by corresponding control valve opening;
According to the relation of main steam pressure and Primary frequency control ability, by the Primary frequency control ability that extremely described current main steam pressure is corresponding of the Primary frequency control ability correction under described specified main steam pressure, it is determined that be current Primary frequency control ability.
Preferably, in above-mentioned online evaluation method, described according to the relation of main steam pressure and Primary frequency control ability, by the described specified main steam pressure fm capacity correction next time Primary frequency control ability that extremely described current main steam pressure is corresponding, it is specially:
Described specified main steam pressure next time fm capacity be multiplied by correction factor obtain described current Primary frequency control ability, described correction factor is described current main steam pressure and the ratio of described specified main steam pressure.
Preferably, in above-mentioned online evaluation method, also comprise before the current main steam pressure that described acquisition steam-turbine unit runs and current regulating valve aperture:
Variable valve pressure under acquisition different adjustment valve opening is damaged, and calculates the relation obtaining control valve opening and variable valve pressure damage;
Obtain specified main steam pressure and lower the relation of joint valve pressure damage change with described steam-turbine unit load variations;
Variable valve pressure when arranging variable valve standard-sized sheet is damaged and is damaged for presetting pressure, calculate and obtain variable valve pressure damage change corresponding when different adjustment valve opening steps to standard-sized sheet, the relation damaged according to described control valve opening and variable valve pressure and described specified main steam pressure are lowered joint valve pressure and are damaged change and the relation of described steam-turbine unit load variations, it is determined that control valve opening under described specified main steam pressure and the relation between corresponding Primary frequency control ability.
Preferably, in above-mentioned online evaluation method, the variable valve pressure under described acquisition different adjustment valve opening is damaged, and calculates the relation obtaining control valve opening and variable valve pressure damage, comprising:
Measuring the main steam pressure that different adjustment valve opening is corresponding, obtain the adjustment downstream pressure of described steam-turbine unit during different load, variable valve pressure damage is:
Δ p=(p1-pe)/p1
In formula, Δ p represents that variable valve pressure is damaged, p1Represent main steam pressure, peRepresent and regulate downstream pressure;
The adjusted valve pressure of matching damages the relation with control valve opening.
Preferably, in above-mentioned online evaluation method, the adjustment downstream pressure of described steam-turbine unit, is specially:
In formula, peRepresent and regulate downstream pressure, NgRepresent steam-turbine unit load, TeTemperature after expression variable valve, pe0Represent the adjustment downstream pressure under rated load, all variable valve standard-sized sheet states, Ng0Represent the steam-turbine unit load under rated load, all variable valve standard-sized sheet states, Te0Temperature after variable valve under expression rated load, all variable valve standard-sized sheet states.
Preferably, in above-mentioned online evaluation method, described acquisition specified main steam pressure is lowered joint valve pressure and is damaged the relation of change with described steam-turbine unit load variations, comprising:
Carry out the test of the step under different adjustment valve opening, obtain the main steam pressure before and after test, control valve opening and steam-turbine unit load;
Steam-turbine unit load before and after test is revised respectively to corresponding to the steam-turbine unit load under specified main steam pressure;
According to the relation that control valve opening and variable valve pressure damage, calculating the variable valve pressure obtaining correspondence before and after different adjustment valve opening step and damage change, matching obtains the relation of main steam pressure tubine unit load change corresponding to different adjustment valve pressure damage change.
Preferably, in online evaluation method, the scope that described default pressure is damaged is 2%-3%.
When applying steam turbine Primary frequency control ability online evaluation method provided by the invention, the current main steam pressure run according to the steam-turbine unit obtained in real time and current regulating valve aperture, load increment corresponding to standard-sized sheet is stepped to by current regulating valve aperture through calculating acquisition steam-turbine unit, i.e. variable power, obtains real-time current Primary frequency control ability. Thus when not affecting unit and normally run; the online evaluation completing steam-turbine unit Primary frequency control ability of high precision; steam-turbine unit can according to assessment result; adjustment steam turbine operation parameter in real time; guarantee that the Primary frequency control ability of unit meets specified requirement; and make steam turbine increase control valve opening while meeting primary frequency modulation requirement as much as possible, it is to increase performance driving economy. Meanwhile, power scheduling department can also monitor the Primary frequency control ability of grid-connected unit in real time, more reasonably arranges electrical production, it is to increase the security of operation of power networks.
In order to reach above-mentioned 2nd object, present invention also offers the online evaluation device of a kind of steam turbine Primary frequency control ability.
An online evaluation device for steam turbine Primary frequency control ability, comprising:
Acquisition module, for obtaining current main steam pressure and the current regulating valve aperture that steam-turbine unit runs in real time;
Calculate module, for according to the control valve opening under the specified main steam pressure of described steam-turbine unit and the relation between corresponding Primary frequency control ability, calculate the Primary frequency control ability under specified main steam pressure corresponding to acquisition current regulating valve aperture, wherein, described Primary frequency control ability is that steam-turbine unit steps to the load increment of standard-sized sheet by corresponding control valve opening;
Correcting module, for the relation according to main steam pressure and Primary frequency control ability, by the Primary frequency control ability that extremely described current main steam pressure is corresponding of the Primary frequency control ability correction under described specified main steam pressure, it is determined that be current Primary frequency control ability.
Preferably, in above-mentioned line apparatus for evaluating, described correcting module be used for described specified main steam pressure next time fm capacity be multiplied by correction factor and obtain current Primary frequency control ability, described correction factor is described current main steam pressure and the ratio of described specified main steam pressure.
Preferably, in above-mentioned line apparatus for evaluating, also comprise:
First acquisition module, damages for the variable valve pressure obtained under different adjustment valve opening, and calculates and obtain the relation of control valve opening with variable valve pressure damage;
2nd acquisition module, lowers the relation of joint valve pressure damage change with described steam-turbine unit load variations for obtaining specified main steam pressure;
Processing module, damage for setting variable valve pressure during variable valve standard-sized sheet and damage for presetting pressure, calculate and obtain variable valve pressure damage change corresponding when different adjustment valve opening steps to standard-sized sheet, the relation damaged according to described control valve opening and variable valve pressure and described specified main steam pressure are lowered joint valve pressure and are damaged change and the relation of described steam-turbine unit load variations, it is determined that control valve opening under described specified main steam pressure and the relation between corresponding Primary frequency control ability.
Apply the online evaluation device of steam turbine Primary frequency control ability provided by the invention, the online evaluation completing Primary frequency control ability of high precision, it is to increase safe operation of electric network.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, it is briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of steam turbine Primary frequency control ability a kind of embodiment of online evaluation method provided by the invention;
Fig. 2 is the Steam Turhine Adjustment valve opening of 1000MW supercritical turbine unit and the relation curve schematic diagram of pressure damage;
The turbine governor valve pressure of Figure 31 000MW supercritical turbine unit damages the relation curve schematic diagram of change with unit load change;
Fig. 4 is the Steam Turhine Adjustment valve opening of 1000MW supercritical turbine unit and the relation curve schematic diagram of Primary frequency control ability;
In Fig. 2-Fig. 3, ● represents testing data, represents the fitting result according to testing data; In Fig. 4, represent steam turbine Primary frequency control ability assessment result.
Embodiment
The embodiment of the invention discloses a kind of steam turbine Primary frequency control ability online evaluation method, Primary frequency control ability when normally running, it is to increase the security of operation of power networks with real-time assessment steam turbine.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only the present invention's part embodiment, instead of whole embodiments. Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 1, Fig. 1 is the schematic flow sheet of steam turbine Primary frequency control ability a kind of embodiment of online evaluation method provided by the invention.
In a kind of embodiment, steam turbine Primary frequency control ability online evaluation method provided by the invention, join vapour steam turbine for throttling, comprise the following steps:
S1: obtain current main steam pressure and current regulating valve aperture that steam-turbine unit runs 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, concrete measuring apparatus and method please refer to prior art, repeat no more herein.
S2: according to the specified main steam pressure of steam-turbine unit relation between fm capacity with corresponding control valve opening next time, calculate and obtain specified main steam pressure fm capacity next time corresponding to current regulating valve aperture, wherein, Primary frequency control ability is that steam-turbine unit steps to load increment corresponding to standard-sized sheet by different adjustment valve opening;
During according to specified main steam pressure, the relation of Primary frequency control ability and control valve opening, also it is exactly the variation relation of Primary frequency control ability with control valve opening, concrete can according to the specified main steam pressure obtained in advance time, steam-turbine unit steps to load increment Δ N corresponding to standard-sized sheet by different adjustment valve opening ΨgWith the relation of corresponding control valve opening Ψ, such as load increment Δ NgWith control valve opening Ψ change curve ψ-Δ NgCurve, or load increment Δ NgWith the change function of control valve opening Ψ, when calculating main steam pressure, current regulating valve aperture steps to load increment corresponding to standard-sized sheet.Namely during main steam pressure, the Primary frequency control ability that current regulating valve aperture is corresponding.
S3: according to the relation of main steam pressure and Primary frequency control ability, by the specified main steam pressure fm capacity correction next time Primary frequency control ability that extremely current main steam pressure is corresponding, it is determined that be current Primary frequency control ability.
The Primary frequency control ability corresponding according to current regulating valve aperture under the main steam pressure obtained, in conjunction with the relation of main steam pressure and Primary frequency control ability, Primary frequency control ability under specified main steam pressure is revised, revises and obtain Primary frequency control ability corresponding to current main steam pressure and be defined as current Primary frequency control ability. Also it is exactly that turbine governor valve steps to load increment corresponding to standard-sized sheet from current aperture and regards as and it can be used as the current Primary frequency control ability of unit by the maximum primary frequency modulation load that unit can provide.
Apply throttling provided by the invention when joining vapour steam turbine Primary frequency control ability online evaluation method, the current main steam pressure run according to the steam-turbine unit obtained in real time and current regulating valve aperture, load increment corresponding to standard-sized sheet is stepped to by current regulating valve aperture through calculating acquisition steam-turbine unit, i.e. variable power, obtains real-time current Primary frequency control ability. Thus when not affecting unit and normally run; the online evaluation completing steam-turbine unit Primary frequency control ability of high precision; steam-turbine unit can according to assessment result; adjustment steam turbine operation parameter in real time; guarantee that the Primary frequency control ability of unit meets specified requirement; and make steam turbine increase control valve opening while meeting primary frequency modulation requirement as much as possible, it is to increase performance driving economy. Meanwhile, power scheduling department can also monitor the Primary frequency control ability of grid-connected unit in real time, more reasonably arranges electrical production, it is to increase the security of operation of power networks.
Concrete, according to the relation of main steam pressure and Primary frequency control ability, by specified main steam pressure fm capacity correction next time to Primary frequency control ability corresponding to current main steam pressure can be: specified main steam pressure next time fm capacity be multiplied by correction factor and obtain current Primary frequency control ability, correction factor is current main steam pressure and the ratio determining main steam pressure. The relation of main steam pressure and Primary frequency control ability, joins vapour steam turbine for throttling, during its actual motion, unit load be directly proportional to main steam pressure example relation, thus can obtain correction factor p1/p10, wherein, p1Represent current main steam pressure, p10Represent specified main steam pressure. Primary frequency control ability during specified main steam pressure and correction factor p1/p10Product, current Primary frequency control ability when being steam turbine actual motion.
Further, also comprised before the current main steam pressure obtaining steam-turbine unit operation in real time and current regulating valve aperture: obtain specified main steam pressure and lower the relation between joint valve opening and corresponding Primary frequency control ability. Also be exactly obtain in advance specified main steam pressure next time fm capacity with the variation relation of control valve opening, and then when real-time assessment Primary frequency control ability as basis for estimation. Concrete, it is possible to comprise the steps:
S01: the variable valve pressure under acquisition different adjustment valve opening is damaged, and calculate the relation obtaining control valve opening and variable valve pressure damage;
S02: obtain specified main steam pressure and lower the relation of joint valve pressure damage change with steam-turbine unit load variations;
S03: variable valve pressure when arranging variable valve standard-sized sheet is damaged and damaged for presetting pressure, calculate and obtain variable valve pressure damage change corresponding when different adjustment valve opening steps to standard-sized sheet, the relation damaged according to control valve opening and variable valve pressure and specified main steam pressure are lowered joint valve pressure and are damaged the relation of change with steam-turbine unit load variations, it is determined that the control valve opening under specified main steam pressure and the relation between corresponding Primary frequency control ability.
Join for vapour steam turbine for throttling, can according to its actual motion or dedicated experiments data, calculate (after variable valve) pressure before the different load tubine first step, and in conjunction with main steam pressure, before and after adjusted valve, pressure reduction damages with pressure, corresponding different control valve openings, the relation that adjusted valve opening is damaged with pressure.According to practical adjustments valve opening step test-results, obtain different adjustment valve pressure and damage the relation of change with unit load change, and be adapted to specified steam parameter. Throttling is joined vapour turbine governor valve and is generally in the operation of throttling state, thus unit has certain Load Regulation allowance, it is the maximum primary frequency modulation load that unit can provide that turbine governor valve steps to load increment corresponding to standard-sized sheet from corresponding aperture, is the Primary frequency control ability of unit. According to control valve opening during steam turbine operation, adjusted valve pressure is damaged and pressure when reaching standard-sized sheet of dashing forward damages change, then damages the relation changed with load variations by pressure, Primary frequency control ability corresponding under can obtaining any control valve opening.
Concrete, above-mentioned steps S01 comprises:
Measuring the main steam pressure that different adjustment valve opening is corresponding, obtain the adjustment downstream pressure of steam-turbine unit during different load, variable valve pressure is damaged (including stop valve herein) and is:
Δ p=(p1-pe)/p1
In formula, Δ p represents that variable valve pressure is damaged, p1Represent main steam pressure, peRepresent and regulate downstream pressure;
The adjusted valve pressure of matching damages the relation with control valve opening.
Further, obtain the adjustment downstream pressure of steam-turbine unit during different load, specifically can be calculated as follows adjustment downstream pressure:
In formula, peRepresent and regulate downstream pressure, NgRepresent steam-turbine unit load, TeTemperature after expression variable valve, pe0Represent the adjustment downstream pressure under rated load, all variable valve standard-sized sheet states, Ng0Represent the steam-turbine unit load under rated load, all variable valve standard-sized sheet states, Te0Temperature after variable valve under expression rated load, all variable valve standard-sized sheet states. Also it is exactly pe、Ng、TeRepresent the parameter value under different load, and the value of each parameter corresponding under being used for representing " rated load, all variable valve standard-sized sheets " state of subscript " 0 ".
During due to Steam Turbine actual motion, unit load NgThe example that is directly proportional to main steam flow G relationship change:
And by Fu Liugeer formula it will be seen that when unit normally runs, pressure p after main steam flow and variable valvee, temperature TeBy following formula relationship change:
In above-mentioned parameter, main steam flow and unit power characterize with perunit value, and the benchmark state that it compares is exactly rated load, all variable valve standard-sized sheets, and subscript " 0 " is used for the value of each parameter represented under rated load, all variable valve standard-sized sheet states, lower with. Then after turbine governor valve, pressure is:
Can be calculated by above-mentioned formula and obtain adjustment downstream pressure corresponding to steam-turbine unit different load, and then the variable valve pressure under acquisition different adjustment valve opening is damaged, and calculate the relation obtaining control valve opening and variable valve pressure damage, specifically can be undertaken by following operation:
(1) normally drop in Steam Turbine heat regenerative system, vacuum system is when normally running, and unit parameter is adjusted to rated load, specified main steam pressure and temperature;
(2) maintain rated load constant, reduce main steam pressure, until turbine governor valve standard-sized sheet;
(3) maintaining main steam pressure constant, slowly reduce unit load, variable valve closes little automatically, and load reduction generally should be made to control valve opening less than 20%;
(4) by formulaCalculate the adjustment downstream pressure under different load, by formula Δ p=(p1-pe)/p1Calculate the pressure of the variable valve under different load to damage;
(5) according to calculation result, depict control valve opening-pressure and damage corresponding points, and the mode adopting power simulates ψ-Δ p curve.
Further, above-mentioned steps S02 comprises:
Carry out the test of the step under different adjustment valve opening, obtain the main steam pressure before and after test, control valve opening and steam-turbine unit load;
Steam-turbine unit load before and after test is revised respectively to corresponding to the steam-turbine unit load under specified main steam pressure;
According to the relation that control valve opening and variable valve pressure damage, calculate the variable valve pressure obtaining correspondence before and after different opening variable valve step and damage change, it is determined that the relation of the main steam pressure tubine unit load change that the pressure damage change of different adjustment valve is corresponding.
The Primary frequency control ability that steam-turbine unit can provide is transformed primarily of unit accumulation of heat, and when steam turbine normal table runs, control valve opening changes suddenly, will inevitably cause unit electric power Spline smoothing and continue for some time. Thus, in the present invention, variable valve pressure damages changes delta (Δ p) and unit load changes delta NgRelation can by control valve opening step test obtain. Concrete grammar is:
(1) unit steady running under different typical loads, such as adjustment unit operation condition, makes turbine governor valve be in the different opening steady running such as 20%, 25%, 30%, 35%, 40%, 50% respectively;
(2) under each control valve opening, control valve opening step test is carried out, the electric power of unit, main steam pressure and control valve opening before and after record test, the amplitude of control valve opening step generally makes electric power considerable change no greater than 10% rated output, under same control valve opening, test generally carries out twice, to ensure experimental result tolerance range;
(3) time constant by control valve opening, unit load is directly proportional to main steam pressure this relation, by the value of the changing value correction of electric power before and after test to specified main steam pressure;
(4) according to ψ-Δ p curve, the change pressing damage before and after control valve opening step is tried to achieve;
(5) according to test-results, in conjunction with the change of electric power during test after revising, depict specified main steam pressure and lower joint valve pressure and damage change-unit load and change corresponding points, and adopt linear mode to simulate Δ (Δ p)-Δ NgCurve.
Relation and the variable valve pressure damaged by aforesaid method acquisition control valve opening and variable valve pressure damage changes delta (Δ p) and unit load changes delta NgRelation, further, specified main steam pressure tubine group control valve opening and Primary frequency control ability curve, specifically can obtain by the following method:
(1) according to the arbitrary aperture of turbine governor valve, obtain the pressure of the variable valve under this aperture by ψ-Δ p curve and damage;
(2) when getting variable valve standard-sized sheet press damage be 2.5%, calculate turbine governor valve from then on aperture to during standard-sized sheet pressure damage change;
(3) variable valve Δ (Δ p)-Δ N is looked intogCurve, under can obtaining specified main steam pressure, this pressure damages load variations corresponding to change;
(4) to variable valve different opening, repeat said process, Steam Turbine control valve opening and Primary frequency control ability curve (ψ-Δ N can be obtainedgCurve).
To sum up, throttling is joined vapour steam turbine Primary frequency control ability online evaluation method and specifically can be comprised the following steps:
(1) according to the current aperture ψ of turbine governor valve in operation, Δ p is damaged by the adjusted valve pressure of ψ-Δ p curve;
(2) during variable valve standard-sized sheet, pressure damage (comprising stop valve) is taken as definite value (generally desirable 2.5%), and pressure when calculating turbine governor valve from current aperture to standard-sized sheet damages changes delta (Δ p);
(3) Δ (Δ p)-Δ N is looked intogUnder curve can obtain specified main steam pressure, pressure when variable valve is from current aperture to standard-sized sheet damages variable power corresponding to change, under this variable power is specified main steam pressure, and the Primary frequency control ability that current regulating valve aperture is corresponding;
(4) according to above result, adjusted valve opening and Primary frequency control ability relation curve (ψ-Δ NgCurve);
(5) by current main steam pressure during unit actual motion and current regulating valve aperture, ψ-Δ N is looked intogCurve, is directly proportional to main steam pressure this relation according to load, is adapted to by the Primary frequency control ability found and current runs main steam pressure, thus can obtain throttling and join the online current Primary frequency control ability of vapour steam turbine.
In the above-described embodiments, preset pressure damages and the damage scope of pressure during variable valve standard-sized sheet is 2%-3%, generally desirable 2.5%.
Concrete, choosing the 1000MW ultra supercritical throttling that a Shanghai steam turbine factory produces, to join vapour steam turbine (N1000-26.25/600/600) be example, carries out Primary frequency control ability assessment as stated above.
First, according to the concrete operation of the relation that above-mentioned acquisition control valve opening and variable valve pressure damage, the ψ-Δ p curve obtained, as shown in Figure 2;
Moreover, damage changes delta (Δ p) and unit load changes delta N according to obtaining variable valve pressure above by the test of control valve opening stepgThe concrete operation of relation, obtain Δ (Δ p)-Δ NgCurve, as shown in Figure 3;
According to the concrete acquisition methods of above-mentioned specified main steam pressure tubine group control valve opening and Primary frequency control ability curve, obtain ψ-Δ NgCurve, as shown in Figure 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, under calculating current regulating valve aperture, specified main vapour pressure time Primary frequency control ability; According to current main steam pressure, calculate Primary frequency control ability correction factor p1/p10; Primary frequency control ability during specified main vapour pressure and correction factor p1/p10Product, current Primary frequency control ability when being Steam Turbine actual motion.
The invention also discloses the online evaluation device of a kind of steam turbine Primary frequency control ability, in a kind of embodiment, comprising:
Acquisition module, for obtaining current main steam pressure and the current regulating valve aperture that steam-turbine unit runs in real time;
Calculate module, for according to the control valve opening under the specified main steam pressure of steam-turbine unit and the relation between corresponding Primary frequency control ability, calculate the Primary frequency control ability under specified main steam pressure corresponding to acquisition current regulating valve aperture, wherein, Primary frequency control ability is that steam-turbine unit steps to the load increment of standard-sized sheet by corresponding control valve opening;
Correcting module, for the relation according to main steam pressure and Primary frequency control ability, by the Primary frequency control ability that extremely current main steam pressure is corresponding of the Primary frequency control ability correction under specified main steam pressure, it is determined that be current Primary frequency control ability.
Further, correcting module be specially for specified main steam pressure next time fm capacity be multiplied by correction factor and obtain current Primary frequency control ability, correction factor is current main steam pressure and the ratio of specified main steam pressure.
Further, the online evaluation device of above-mentioned steam turbine Primary frequency control ability also comprises:
First acquisition module, damages for the variable valve pressure obtained under different adjustment valve opening, and calculates and obtain the relation of control valve opening with variable valve pressure damage;
2nd acquisition module, lowers the relation of joint valve pressure damage change with steam-turbine unit load variations for obtaining specified main steam pressure;
Processing module, damage for setting variable valve pressure during variable valve standard-sized sheet and damage for presetting pressure, calculate and obtain variable valve pressure damage change corresponding when different adjustment valve opening steps to standard-sized sheet, the relation damaged according to control valve opening and variable valve pressure and specified main steam pressure are lowered joint valve pressure and are damaged the relation of change with steam-turbine unit load variations, it is determined that the control valve opening under specified main steam pressure and the relation between corresponding Primary frequency control ability.
Specifically, the first acquisition module can comprise main steam pressure acquiring unit, for measuring main steam pressure corresponding to different adjustment valve opening;Pressure acquiring unit after variable valve, the adjustment downstream pressure of steam-turbine unit during for obtaining different load, variable valve pressure damage is:
Δ p=(p1-pe)/p1
In formula, Δ p represents that variable valve pressure is damaged, p1Represent main steam pressure, peRepresent and regulate downstream pressure;
Fitting unit, obtains variable valve pressure for matching and damages the relation with control valve opening.
The adjustment downstream pressure of steam-turbine unit, is specially:
In formula, peRepresent and regulate downstream pressure, NgRepresent steam-turbine unit load, TeTemperature after expression variable valve, the value of each parameter that subscript " 0 " is corresponding under being used for representing " rated load, all variable valve standard-sized sheets " state.
Further, the 2nd acquisition module comprises:
Acquiring unit, for obtaining under different adjustment valve opening the main steam pressure before and after step test, control valve opening and steam-turbine unit load;
Amending unit, for revising the steam-turbine unit load before and after test respectively to corresponding to the steam-turbine unit load under specified main steam pressure;
Processing unit, for the relation damaged according to control valve opening and variable valve pressure, calculate and obtain variable valve pressure damage change corresponding before and after different opening variable valve step, it is determined that different adjustment valve pressure damages the relation of the main steam pressure tubine unit load change of change correspondence.
In this specification sheets, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment emphasis illustrated is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are enable to realize or use the present invention. To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments. Therefore, the present invention can not be limited in these embodiments shown in this article, but be met the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. the online evaluation method of a steam turbine Primary frequency control ability, it is characterised in that, comprising:
Obtain current main steam pressure and current regulating valve aperture that steam-turbine unit runs in real time;
According to the control valve opening under the specified main steam pressure of described steam-turbine unit and the relation between corresponding Primary frequency control ability, calculate the Primary frequency control ability under specified main steam pressure corresponding to acquisition current regulating valve aperture, wherein, described Primary frequency control ability is that steam-turbine unit steps to the load increment of standard-sized sheet by corresponding control valve opening;
According to the relation of main steam pressure and Primary frequency control ability, by the Primary frequency control ability that extremely described current main steam pressure is corresponding of the Primary frequency control ability correction under described specified main steam pressure, it is determined that be current Primary frequency control ability.
2. online evaluation method according to claim 1, it is characterized in that, described according to the relation of main steam pressure and Primary frequency control ability, by the described specified main steam pressure fm capacity correction next time Primary frequency control ability that extremely described current main steam pressure is corresponding, it is specially:
Described specified main steam pressure next time fm capacity be multiplied by correction factor obtain described current Primary frequency control ability, described correction factor is described current main steam pressure and the ratio of described specified main steam pressure.
3. online evaluation method according to claim 1 and 2, it is characterised in that, also comprise before the current main steam pressure that described real-time acquisition steam-turbine unit runs and current regulating valve aperture:
Variable valve pressure under acquisition different adjustment valve opening is damaged, and calculates the relation obtaining control valve opening and variable valve pressure damage;
Obtain specified main steam pressure and lower the relation of joint valve pressure damage change with described steam-turbine unit load variations;
Variable valve pressure when arranging variable valve standard-sized sheet is damaged and is damaged for presetting pressure, calculate and obtain variable valve pressure damage change corresponding when different adjustment valve opening steps to standard-sized sheet, the relation damaged according to described control valve opening and variable valve pressure and described specified main steam pressure are lowered joint valve pressure and are damaged change and the relation of described steam-turbine unit load variations, it is determined that control valve opening under described specified main steam pressure and the relation between corresponding Primary frequency control ability.
4. online evaluation method according to claim 3, it is characterised in that, the variable valve pressure under described acquisition different adjustment valve opening is damaged, and calculates the relation obtaining control valve opening and variable valve pressure damage, comprising:
Measuring the main steam pressure that different adjustment valve opening is corresponding, obtain the adjustment downstream pressure of described steam-turbine unit during different load, variable valve pressure damage is:
Δ p=(p1-pe)/p1
In formula, Δ p represents that variable valve pressure is damaged, p1Represent main steam pressure, peRepresent and regulate downstream pressure;
The adjusted valve pressure of matching damages the relation with control valve opening.
5. online evaluation method according to claim 4, it is characterised in that, the adjustment downstream pressure of described steam-turbine unit, is specially:
In formula, peRepresent and regulate downstream pressure, NgRepresent steam-turbine unit load, TeTemperature after expression variable valve, pe0Represent the adjustment downstream pressure under rated load, all variable valve standard-sized sheet states, Ng0Represent the steam-turbine unit load under rated load, all variable valve standard-sized sheet states, Te0Temperature after variable valve under expression rated load, all variable valve standard-sized sheet states.
6. online evaluation method according to claim 3, it is characterised in that, described acquisition specified main steam pressure is lowered joint valve pressure and is damaged the relation of change with described steam-turbine unit load variations, comprising:
Carry out the test of the step under different adjustment valve opening, obtain the main steam pressure before and after test, control valve opening and steam-turbine unit load;
Steam-turbine unit load before and after test is revised respectively to corresponding to the steam-turbine unit load under specified main steam pressure;
According to the relation that control valve opening and variable valve pressure damage, calculating the variable valve pressure obtaining correspondence before and after different adjustment valve opening step and damage change, matching obtains the relation of main steam pressure tubine unit load change corresponding to different adjustment valve pressure damage change.
7. online evaluation method according to claim 3, it is characterised in that, the scope that described default pressure is damaged is 2%-3%.
8. the online evaluation device of a steam turbine Primary frequency control ability, it is characterised in that, comprising:
Acquisition module, for obtaining current main steam pressure and the current regulating valve aperture that steam-turbine unit runs in real time;
Calculate module, for according to the control valve opening under the specified main steam pressure of described steam-turbine unit and the relation between corresponding Primary frequency control ability, calculate the Primary frequency control ability under specified main steam pressure corresponding to acquisition current regulating valve aperture, wherein, described Primary frequency control ability is that steam-turbine unit steps to the load increment of standard-sized sheet by corresponding control valve opening;
Correcting module, for the relation according to main steam pressure and Primary frequency control ability, by the Primary frequency control ability that extremely described current main steam pressure is corresponding of the Primary frequency control ability correction under described specified main steam pressure, it is determined that be current Primary frequency control ability.
9. online evaluation device according to claim 8, it is characterized in that, described correcting module be used for described specified main steam pressure next time fm capacity be multiplied by correction factor and obtain current Primary frequency control ability, described correction factor is described current main steam pressure and the ratio of described specified main steam pressure.
10. online evaluation device according to claim 8, it is characterised in that, also comprise:
First acquisition module, damages for the variable valve pressure obtained under different adjustment valve opening, and calculates and obtain the relation of control valve opening with variable valve pressure damage;
2nd acquisition module, lowers the relation of joint valve pressure damage change with described steam-turbine unit load variations for obtaining specified main steam pressure;
Processing module, damage for setting variable valve pressure during variable valve standard-sized sheet and damage for presetting pressure, calculate and obtain variable valve pressure damage change corresponding when different adjustment valve opening steps to standard-sized sheet, the relation damaged according to described control valve opening and variable valve pressure and described specified main steam pressure are lowered joint valve pressure and are damaged change and the relation of described steam-turbine unit load variations, it is determined that control valve opening under described specified main steam pressure and the relation between corresponding Primary frequency control ability.
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