CN108194249A - 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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- CN108194249A CN108194249A CN201810053307.6A CN201810053307A CN108194249A CN 108194249 A CN108194249 A CN 108194249A CN 201810053307 A CN201810053307 A CN 201810053307A CN 108194249 A CN108194249 A CN 108194249A
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- guide vane
- turbine
- pressure head
- generator units
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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 measuring the water level of inlet channel lower curved section or venthole before and after runner surge suppressor is closed and obtains the front and rear pressure head change curve of guide vane with tailwater elevation pressure difference value change curve, 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 pressure head before and after the guide vane 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 Site Detection.
Background technology
With being on the increase 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 so that water resource is not fully utilized, is unfavorable for the warp of power plant
On the other hand Ji operation can cause compressor emergency shutdown difficult or occur shutting down to wriggle, threaten safe operation of power plant.Therefore, unit exists
The front and rear measurement for carrying out guide vane water leakage of overhaul is very important.
At present, the method for measuring movable guide vane water leakage uses " inclined shaft method " and " venthole method " isometric(al) method measurement side more
Method, experiment process usually first carry out runner and disappear pressure, measurement water leakage of gate amount, and runner is carried out 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 is leaked with gate
The sum of water.There are many difficulties for this measuring method：First, this method test program is cumbersome, and time of measuring is long, influences to overhaul
Duration, and for pump-storage generator, bulb-type tubular hydro set, SEA LEVEL VARIATION is rapid, when test, need to stop remaining unit
Machine is with exclusive PCR.Secondly, on the influence that the more guide vane water leakages of water leakage of gate amount calculate is discussed, many articles propose gate
Water leakage is smaller, can be ignored, but this saying is not rigorous.Such as certain hydroelectric power plant 80MW units are 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 appropriate calculation interval, choose appropriate curve smoothing points.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, the selection of calculation interval can generate certain error to water leakage calculating in itself；It meanwhile 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, the flow calculated
Q is the guide vane water leakage as current head H, this is also inaccurate.Therefore, how to realize that one kind can realize preparation detection
The method of turbine-generator units guide vane water leakage has become a key technical problem urgently to be resolved hurrily.
Invention content
The technical problem to be solved in the present invention：For the above problem of the prior art, concora crush dress can be filtered by providing one kind
The transient process of the water pressure fluctuations such as closing is put, fundamentally eliminates the interference that water leakage of gate amount calculates guide vane water leakage, is examined
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 is：
The present invention provides a kind of turbine-generator units guide vane leak quantity measuring method, and implementation steps include：
1) for turbine-generator units, the water of inlet channel lower curved section or venthole before and after runner surge suppressor is closed is measured
Position and tailwater elevation pressure difference value change curve, obtain the front and rear pressure head change curve H (t) of guide vane；
2) 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, solve runner and put down
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 rear pressure head H0Pressure head fall off rate V before and after acquisition guide vane0；
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, measure in step 1) before and after runner surge suppressor is closed the water level of inlet channel lower curved section or venthole with
Tailwater elevation pressure difference value change curve specifically refers to what is carried out under the stop gate closed state of turbine-generator units.
Preferably, the middle pressure head fall off rate V before and after obtaining guide vane of 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 the guide vane water leakage for obtaining turbine-generator units is calculated in step 3)
Show；
Q0=FV0-max (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, V0-maxFor pressure head fall off rate V before and after guide vane0Maximum value.
The present invention also provides a kind of turbine-generator units guide vane leak amount detection systems, including computer equipment, the meter
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 advantageous effects：The present invention is by being based on two
Secondary least square fitting model, front and rear 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, is surveyed compared to conventional method
Try program it is simpler, by pressure head decline curve before and after segmental slipping Fitting Analysis guide vane find surge suppressor close 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 examined for turbine-generator units guide vane water leakage of the present invention
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.
Description of the drawings
Fig. 1 is the turbine-generator units structure 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 inlet channel 2 and tail water
Section 3 between, 2 front end of inlet channel is connected by stop gate 4 with upstream, tail water section 3 and communicating downstream, inlet channel 2 oneself
By being in communication with the outside on the upside of the water surface equipped with venthole 21, wherein H represents the water-head of upstream and downstream, and Δ H represents inlet channel 2
Caused change of water level amount before and after unlatching.Runner surge suppressor is installed, the effect of runner surge suppressor is pair at inlet channel 2
Water inlet flow channel carries out water-filling so that inlet gate upstream and downstream water level is identical during on-test, before and after measuring complete guide vane
Pressure head change curve H (t).Since existing runner surge suppressor has a variety of realization methods, such as equalizing valve concora crush, lock is carried
Door concora crush etc., therefore omit do not draw in Fig. 1.
As shown in Fig. 2, the implementation steps of the present embodiment turbine-generator units guide vane leak quantity measuring method include：
1) for turbine-generator units, the water of inlet channel lower curved section or venthole before and after runner surge suppressor is closed is measured
Position and tailwater elevation pressure difference value change curve, obtain the front and rear pressure head change curve H (t) of guide vane；
2) 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, solve runner and put down
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 rear pressure head H0Pressure head fall off rate V before and after acquisition guide vane0；
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.
The water of inlet channel lower curved section or venthole before and after runner surge suppressor is closed is measured in the present embodiment, 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.First, it tests and is carrying out 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 rear pressure head change curve H (t) of guide vane.
When carrying out segmental slipping fitting to pressure head change curve H (t) before and after guide vane in step 2), by verification experimental verification
The different sliding window length of normal setting, the result of calculation of data window length are 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 the multiple of 10 times of window length of sliding or more, to filter out interference.
In the present embodiment, pressure head fall off rate V before and after acquisition guide vane in step 2)0It specifically refers to fill runner concora crush
Put 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 the guide vane water leakage for obtaining turbine-generator units is calculated in step 3)
(1) shown in；
Q0=FV0-max (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, V0-maxFor pressure head fall off rate V before and after guide vane0Maximum value.
The data trend figure that Fig. 3 is changed over time for pressure head before and after guide vane provided in an embodiment of the present invention.Such as Fig. 3 institutes
Show, the data length that pressure head changes over time curve before and after the guide vane in the embodiment is 1800, 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 Q0For：
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 accurate, 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, it can be the processing such as CPU, DSP, FPGA to go back computer equipment
Device.
Embodiment two：
The present embodiment is also further increased on the basis of embodiment one, 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 being tested in the present embodiment, and inlet gate center is supreme
Swimming position pressure differential 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
For：
Qr=Q0(Hr/H0)0.5=0.1661 (m3/s)。
The above is only the preferred embodiment of the present invention, and 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) for turbine-generator units, measure before and after runner surge suppressor is closed the water level of inlet channel lower curved section or venthole with
Tailwater elevation pressure difference value change curve obtains the front and rear pressure head change curve H (t) of guide vane；
2) based on secondary least square fitting model, segmental slipping plan is carried out 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 afterwards0Pressure head fall off rate V before and after acquisition guide vane0；
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 the water level of inlet channel lower curved section or venthole and tailwater elevation pressure difference value change curve before and after runner surge suppressor is closed
Specifically refer to what is carried 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 pressure head fall off rate V before and after guide vane0Specifically 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
Shown in the function expression such as formula (1) for calculating the guide vane water leakage for obtaining turbine-generator units；
Q0=FV0-max (1)
In formula (1), Q0For the guide vane water leakage of turbine-generator units, F is hydroturbine water intake pipeline inclined shaft section or the level of venthole
Area of section, V0-maxFor pressure head fall off rate V before and after guide vane0Maximum value.
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 in Claims 1 to 4 the step of turbine-generator units guide vane leak quantity measuring method described in any one
Suddenly.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112915330A (en) * | 2021-02-24 | 2021-06-08 | 浙江工业大学 | Mechanical ventilation platform pressure measurement compliance evaluation method |
| CN114060200A (en) * | 2021-11-18 | 2022-02-18 | 中国水利水电科学研究院 | Method for simultaneously measuring water leakage of working gate and movable guide vane |
| CN114165382A (en) * | 2021-11-24 | 2022-03-11 | 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112915330A (en) * | 2021-02-24 | 2021-06-08 | 浙江工业大学 | Mechanical ventilation platform pressure measurement compliance evaluation method |
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| CN114165382A (en) * | 2021-11-24 | 2022-03-11 | 华电电力科学研究院有限公司 | Method and system for testing absolute efficiency of hydroelectric generating set |
| 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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