CN108194249B - A kind of turbine-generator units guide vane leak quantity measuring method and system - Google Patents
A kind of turbine-generator units guide vane leak quantity measuring method and system Download PDFInfo
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- CN108194249B CN108194249B CN201810053307.6A CN201810053307A CN108194249B CN 108194249 B CN108194249 B CN 108194249B CN 201810053307 A CN201810053307 A CN 201810053307A CN 108194249 B CN108194249 B CN 108194249B
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- guide vane
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/008—Measuring or testing arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
- Control Of Water Turbines (AREA)
Abstract
The invention discloses a kind of turbine-generator units guide vane leak quantity measuring method and systems, method and step includes that the water level and tailwater elevation pressure difference value change curve of water inlet line lower curved section or venthole before and after measuring the closing of runner surge suppressor obtain the front and back pressure head change curve of guide vane, it is fitted based on secondary least square fitting model segmental slipping, obtain the time point that curve tangent slope maximum absolute value value point is closed as runner surge suppressor, it solves the guide vane front and back pressure head at the time point that runner surge suppressor is closed and obtains pressure head fall off rate before and after guide vane, based on pressure head fall off rate before and after guide vane, hydroturbine water intake pipeline inclined shaft section or the horizontal section area of venthole calculate the guide vane water leakage of turbine-generator units.The present invention can filter the transient process of the water pressure fluctuations such as surge suppressor closing, fundamentally eliminate the interference that water leakage of gate amount calculates guide vane water leakage, have the advantages that testing result is accurate, test is quick.
Description
Technical field
The present invention relates to power station on-the-spot test technologies, and in particular to a kind of turbine-generator units guide vane water leakage detection side
Method and system diagnose turbine-generator units guide vane water leakage for on-site test.
Background technique
With being increasing for China's hydropower installed capacity, economic benefit and safety evaluation to Hydropower Unit are also more
Strictly, Hydropower Unit movable guide vane water leakage is excessive, on the one hand water resource is not fully utilized, and is unfavorable for the warp of power plant
On the other hand Ji operation will cause compressor emergency shutdown difficulty or occur shutting down and wriggle, threatens safe operation of power plant.Therefore, unit exists
The measurement that guide vane water leakage is carried out before and after overhaul is very important.
Currently, the method for measurement movable guide vane water leakage mostly uses " inclined shaft method " and " venthole method " isometric(al) method measurement side
Method, experiment process usually first carry out runner and disappear pressure, measurement water leakage of gate amount, carry out runner after water leakage of gate measurement
Water-filling, until measuring nominal guide vane water leakage before and after gate after concora crush.Guide vane water leakage is that nominal guide vane water leakage and gate leak
The sum of water.There are many difficulties for this measurement method: firstly, this method test program is cumbersome, time of measuring is long, influences to overhaul
Duration, and for pump-storage generator, bulb-type tubular hydro set, SEA LEVEL VARIATION is rapid, and when test need to stop remaining unit
Machine is with exclusive PCR.Secondly, thering are many articles to propose gate on the influence that the more guide vane water leakages of water leakage of gate amount calculate is discussed
Water leakage is smaller, can be ignored, but this saying is not rigorous.Such as certain hydroelectric power plant 80MW unit is by original method calculating
Specified water leakage of gate amount accounting is up to 8.47% in specified guide vane water leakage.Again, to reduce error, water leakage is calculated with volumetric method
It needs to select calculation interval appropriate, choose curve smoothing points appropriate.Pressure head H is from water inlet flow channel concora crush before and after guide vane
It is water leakage of gate amount and guide vane water leakage that facility, which is begun to shut off to the decline curve after venthole water level decreasing to water inlet flow channel,
Resultant curve.Therefore, selection of calculation interval itself can generate certain error to water leakage calculating；Meanwhile it will be randomly selected
Shut-in time of H (t) the curve t=0 moment that calculation interval is fitted as entrance gate or venthole, calculated flow
Q is the guide vane water leakage as current head H, this is also inaccuracy.Therefore, how to realize that one kind can be realized preparation detection
The method of turbine-generator units guide vane water leakage has become a key technical problem urgently to be resolved.
Summary of the invention
The technical problem to be solved in the present invention: in view of the above problems in the prior art, concora crush dress can be filtered by providing one kind
The transient process for setting the water pressure fluctuations such as closing, fundamentally eliminates the interference that water leakage of gate amount calculates guide vane water leakage, examines
Survey accurate result, the quick turbine-generator units guide vane leak quantity measuring method of test and system.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
The present invention provides a kind of turbine-generator units guide vane leak quantity measuring method, and implementation steps include:
1) turbine-generator units are directed to, measurement runner surge suppressor closes the water of front and back water inlet line lower curved section or venthole
Position and tailwater elevation pressure difference value change curve, obtain the front and back pressure head change curve H (t) of guide vane；
2) it is based on secondary least square fitting model, segmental slipping is carried out to pressure head change curve H (t) before and after guide vane
Fitting obtains the time point t that curve tangent slope maximum absolute value value point is closed as runner surge suppressor0, it is flat to solve runner
The time point t that pressure device is closed0Guide vane before and after pressure head H0；The time point t closed according to runner surge suppressor0Guide vane
Front and back pressure head H0Obtain guide vane front and back pressure head fall off rate V0；
3) based on pressure head fall off rate V before and after guide vane0, hydroturbine water intake pipeline inclined shaft section or venthole level cut
Face area F calculates the guide vane water leakage for obtaining turbine-generator units.
Preferably, in step 1) measurement runner surge suppressor close the water level of front and back water inlet line lower curved section or venthole with
What tailwater elevation pressure difference value change curve specifically referred to carry out under the stop gate closed states of turbine-generator units.
Preferably, guide vane front and back pressure head fall off rate V is obtained in step 2)0It specifically refers to close runner surge suppressor
The time point t closed0Guide vane before and after pressure head H0It carries out derivation and obtains pressure head fall off rate V before and after guide vane0。
Preferably, function expression such as formula (1) institute for obtaining the guide vane water leakage of turbine-generator units is calculated in step 3)
Show；
Q0=FV0 (1)
In formula (1), Q0For the guide vane water leakage of turbine-generator units, F is hydroturbine water intake pipeline inclined shaft section or venthole
Horizontal section area, V0For time point t0Guide vane before and after pressure head fall off rate.
The present invention also provides a kind of turbine-generator units guide vane leak amount detection systems, including computer equipment, the meters
Calculate the step of machine equipment is programmed to perform aforementioned turbine-generator units guide vane leak quantity measuring method of the invention.
Turbine-generator units guide vane leak quantity measuring method of the present invention has following the utility model has the advantages that the present invention is by being based on two
Secondary least square fitting model, front and back pressure head change curve H (t) carry out segmental slipping fitting, obtain H (t) curve tangent line
The time point t that slope absolute value maximum of points is closed as runner surge suppressor0, solve the time point that runner surge suppressor is closed
t0Guide vane before and after pressure head H0, according to the time point t of runner surge suppressor closing0Guide vane before and after pressure head H0It obtains
Pressure head fall off rate V before and after guide vane0, it is based ultimately upon pressure head fall off rate V before and after guide vane0, hydroturbine water intake pipeline it is oblique
The horizontal section area F of well section or venthole calculates the guide vane water leakage for obtaining turbine-generator units, surveys compared to conventional method
Try that program is simpler, by pressure head decline curve before and after segmental slipping Fitting Analysis guide vane find surge suppressor closing when
Between point calculated, can effectively filter surge suppressor close generate transient process, eliminate water leakage of gate amount to guide vane leak
The interference that water calculates, improves test efficiency, has the advantages that testing result is accurate, test is quick.
Turbine-generator units guide vane leak amount detection systems of the present invention are turbine-generator units guide vane water leakage of the present invention inspection
The corresponding system of survey method, thus it is equally also aforementioned excellent with turbine-generator units guide vane leak quantity measuring method of the present invention
Point, therefore details are not described herein.
Detailed description of the invention
Fig. 1 is the turbine-generator units structural schematic diagram of application of the embodiment of the present invention.
Fig. 2 is the basic procedure schematic diagram of present invention method.
Fig. 3 is pressure head time history plot before and after the guide vane that the embodiment of the present invention obtains.
Specific embodiment
Embodiment one:
It hereafter will be by taking turbine-generator units shown in Fig. 1 as an example, to turbine-generator units guide vane water leakage detection side of the present invention
Method and system are described in further detail.Referring to Fig. 1, the guide vane 1 of turbine-generator units is mounted on water inlet line 2 and tail water
Between section 3,2 front end of water inlet line is connected to by stop gate 4 with upstream, tail water section 3 and communicating downstream, water inlet line 2 oneself
It is in communication with the outside by being equipped with venthole 21 on the upside of the water surface, wherein H indicates the water-head of upstream and downstream, and △ H indicates water inlet line 2
Open change of water level amount caused by front and back.Runner surge suppressor is installed, the effect of runner surge suppressor is pair at water inlet line 2
Water inlet flow channel carries out water-filling, so that inlet gate upstream and downstream water level is identical when on-test, to measure the front and back of complete guide vane
Pressure head change curve H (t).Since existing runner surge suppressor has a variety of implementations, such as equalizing valve concora crush, lock is mentioned
Door concora crush etc., therefore omit in Fig. 1 and do not draw.
As shown in Fig. 2, the implementation steps of the present embodiment turbine-generator units guide vane leak quantity measuring method include:
1) turbine-generator units are directed to, measurement runner surge suppressor closes the water of front and back water inlet line lower curved section or venthole
Position and tailwater elevation pressure difference value change curve, obtain the front and back pressure head change curve H (t) of guide vane；
2) it is based on secondary least square fitting model, segmental slipping is carried out to pressure head change curve H (t) before and after guide vane
Fitting obtains the time point t that curve tangent slope maximum absolute value value point is closed as runner surge suppressor0, it is flat to solve runner
The time point t that pressure device is closed0Guide vane before and after pressure head H0；The time point t closed according to runner surge suppressor0Guide vane
Front and back pressure head H0Obtain guide vane front and back pressure head fall off rate V0；
3) based on pressure head fall off rate V before and after guide vane0, hydroturbine water intake pipeline inclined shaft section or venthole level cut
Face area F calculates the guide vane water leakage for obtaining turbine-generator units.
In the present embodiment, measurement runner surge suppressor closes the water of front and back water inlet line lower curved section or venthole in step 1)
Position with tailwater elevation pressure difference value change curve specifically refer to turbine-generator units stop gate (referring in Fig. 1 marked as 4
Component) carry out under closed state.Firstly, test is being carried out when falling unit stop gate, pass through runner concora crush
Device after concora crush, that is, starts to test to unit water inlet flow channel concora crush, is then shut off runner surge suppressor, before measuring guide vane
Pressure head change curve afterwards obtains the front and back pressure head change curve H (t) of guide vane.
When carrying out segmental slipping fitting to guide vane front and back pressure head change curve H (t) in step 2), by verification experimental verification
Different sliding window length are arranged in normal, the calculated result of data window length is not much different, and the general length for sliding window is according to data
Computational accuracy is chosen, and data window is chosen according to 10 times of window length of sliding or more of multiple, to filter out interference.
Guide vane front and back pressure head fall off rate V is obtained in the present embodiment, in step 2)0It specifically refers to fill runner concora crush
Set the time point t of closing0Guide vane before and after pressure head H0It carries out derivation and obtains pressure head fall off rate V before and after guide vane0。
In the present embodiment, the function expression such as formula for obtaining the guide vane water leakage of turbine-generator units is calculated in step 3)
(1) shown in；
Q0=FV0 (1)
In formula (1), Q0For the guide vane water leakage of turbine-generator units, F is hydroturbine water intake pipeline inclined shaft section or venthole
Horizontal section area, V0For time point t0Guide vane before and after pressure head fall off rate.
Fig. 3 is the data trend figure that guide vane front and back provided in an embodiment of the present invention pressure head changes over time.Such as Fig. 3 institute
Show, it is 1800 that pressure head, which changes over time the data length of curve, before and after the guide vane in the embodiment, slip length access
According to 0.5% i.e. 9 of length, section length takes 180.Pass through the Fitting Calculation, t0Pressure head H before and after moment guide vane0For 56.909m,
Corresponding guide vane water leakage Q0Are as follows:
Q0=FV0=2.0096 × 0.0848=0.1704 (m3/s)
The present embodiment turbine-generator units guide vane leak quantity measuring method is simpler compared to conventional method test program, leads to
It crosses pressure head decline curve before and after segmental slipping Fitting Analysis guide vane and finds time point of surge suppressor closing and calculated, energy
Enough effectively filtering surge suppressors close the transient process generated, eliminate the interference that water leakage of gate amount calculates guide vane water leakage,
Testing process is simple, and test result is more acurrate, while can effectively improve test efficiency.The present embodiment also provides a kind of water wheels hair
Motor group guide vane leak amount detection systems, including computer equipment, before the computer equipment is programmed to perform the present embodiment
The step of stating turbine-generator units guide vane leak quantity measuring method, also computer equipment can be the processing such as CPU, DSP, FPGA
Device.
Embodiment two:
The present embodiment is also further increased on the basis of example 1, in step 3) including calculating volume according to formula (2)
The step of determining the guide vane water leakage under head；
Qr=Q0(Hr/H0)0.5 (2)
In formula (2), QrFor the guide vane water leakage under rated head, HrFor rated head, H0It is closed for runner surge suppressor
Time point t0Guide vane before and after pressure head.
Upstream water level is 248.75m, the level of tail water 190.55m when testing in the present embodiment, and inlet gate center is supreme
Swimming position pressure difference is 32m；t0Moment venthole water level is 246.629m, and inlet gate center is poor to venthole level pressure
For 29.88m, then t0The 3.37% of gate water leakage when moment water leakage of gate amount is penstock passive state.It can be seen that this time gating
Door leak is very small on the calculating influence of guide vane water leakage, can be ignored.Then the guide vane water leakage Q of rated head is arrived in conversionr
Are as follows:
Qr=Q0(Hr/H0)0.5=0.1661 (m3/s)。
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of turbine-generator units guide vane leak quantity measuring method, it is characterised in that implementation steps include:
1) be directed to turbine-generator units, measurement runner surge suppressor close front and back water inlet line lower curved section or venthole water level with
Tailwater elevation pressure difference value change curve, obtains the front and back pressure head change curve H (t) of guide vane；
2) it is based on secondary least square fitting model, it is quasi- to carry out segmental slipping to pressure head change curve H (t) before and after guide vane
It closes, obtains the time point t that curve tangent slope maximum absolute value value point is closed as runner surge suppressor0, solve runner concora crush
The time point t that device is closed0Guide vane before and after pressure head H0；The time point t closed according to runner surge suppressor0Guide vane before
Pressure head H afterwards0Obtain guide vane front and back pressure head fall off rate V0；
3) based on pressure head fall off rate V before and after guide vane0, hydroturbine water intake pipeline inclined shaft section or venthole horizontal cross-section face
Product F calculates the guide vane water leakage for obtaining turbine-generator units.
2. turbine-generator units guide vane leak quantity measuring method according to claim 1, which is characterized in that surveyed in step 1)
Measure water level and tailwater elevation pressure difference value change curve that runner surge suppressor closes front and back water inlet line lower curved section or venthole
It specifically refers to carry out under the stop gate closed state of turbine-generator units.
3. turbine-generator units guide vane leak quantity measuring method according to claim 1, which is characterized in that obtained in step 2)
Take guide vane front and back pressure head fall off rate V0Specifically refer to the time point t closed to runner surge suppressor0Guide vane before and after pressure
Head H0It carries out derivation and obtains pressure head fall off rate V before and after guide vane0。
4. turbine-generator units guide vane leak quantity measuring method according to claim 1, which is characterized in that step 3) is fallen into a trap
It calculates and obtains shown in the function expression such as formula (1) of the guide vane water leakage of turbine-generator units；
Q0=FV0 (1)
In formula (1), Q0For the guide vane water leakage of turbine-generator units, F is the level of hydroturbine water intake pipeline inclined shaft section or venthole
Area of section, V0For time point t0Guide vane before and after pressure head fall off rate.
5. a kind of turbine-generator units guide vane leak amount detection systems, including computer equipment, which is characterized in that the computer
Equipment is programmed to perform the step of turbine-generator units guide vane leak quantity measuring method described in any one of Claims 1 to 4
Suddenly.
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| CN112915330B (en) * | 2021-02-24 | 2023-02-14 | 浙江工业大学 | Mechanical ventilation platform pressure measurement compliance evaluation method |
| CN114060200B (en) * | 2021-11-18 | 2022-09-30 | 中国水利水电科学研究院 | Method for simultaneously measuring water leakage of working gate and movable guide vane |
| CN114165382B (en) * | 2021-11-24 | 2023-06-20 | 华电电力科学研究院有限公司 | Method and system for testing absolute efficiency of hydroelectric generating set |
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