CN104500326A - Starting-up method for hydraulic turbine set of power station - Google Patents
Starting-up method for hydraulic turbine set of power station Download PDFInfo
- Publication number
- CN104500326A CN104500326A CN201410752180.9A CN201410752180A CN104500326A CN 104500326 A CN104500326 A CN 104500326A CN 201410752180 A CN201410752180 A CN 201410752180A CN 104500326 A CN104500326 A CN 104500326A
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- Prior art keywords
- starting
- stator
- speed
- opening
- guide vane
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Classifications
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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
- F03B15/00—Controlling
- F03B15/02—Controlling by varying liquid flow
- F03B15/04—Controlling by varying liquid flow of turbines
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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)
- Control Of Water Turbines (AREA)
- Hydraulic Turbines (AREA)
Abstract
The invention relates to a starting-up method for a hydraulic turbine set of a power station. According to the starting-up method, one-segment or multi-segment starting-up is adopted through a speed regulator; in the starting process of a guide vane, the aperture of the guide vane increases along with a set starting rate, so that the ratio of the aperture of the guide vane to time is a linear slope. By adopting the starting-up method for the hydraulic turbine set of the power station, the stress on the guide vane of the hydraulic turbine set in a starting-up process is reduced, the dynamic stress peak value of a runner lower ring side is lowered, the fatigue life of a runner blade is prolonged by times, and the safe running risk and production cost of a runner are lowered.
Description
Technical field
The present invention relates to a kind of natural flow station, particularly relate to a kind of starting-up method of Power Station Turbine group.
Background technique
At present, general hydropower scheduling stable equipment operation is reliable.Wherein, apply speed regulator and power-on operation is carried out to water power plant.Speed regulator is for detecting rotational speed of water turbine, and the size of adjustment rotating speed, controls hydraulic turbine discharge, controls water turbine set start, shutdown, emergency shutdown and increasing and decreasing load.In turbine-generator units start process, existing employing speed regulator starting-up method is the segmented start that Running test adopts.Such as, as shown in Figure 1, when adopting following speed regulator rotating speed to be less than 35Hz, guide vane opening is no-load opening (described no-load opening is the moment of dropping into electrical network after water turbine units reaches rated speed, and the aperture that stator reaches, is called no-load opening); Rotating speed is at 35Hz-44Hz, and guide vane opening is the aperture of no-load opening+5%; Rotating speed is at 44Hz-47.5Hz, and guide vane opening is 1.5 times of no-load opening; Rotating speed is greater than 47.5Hz, and speed regulator turns unloaded state.In whole start process, limit=no-load opening * 1.5 is opened in the zero load of water turbine set stator.As shown in Figures 2 and 3, under stator, the dynamic stress peak value of ring side is up to 340MPa; The dynamic stress peak value of crown side is up to 55MPa.
Above-mentioned speed regulator starting-up method makes rotary wheel of water turbine run when zero load or partial load, the stress raiser dynamic stress of rotary wheel of water turbine stator is excessive, easily make rotary wheel of water turbine stator occur crackle and defect, need frequent repair and replacement to add cost of production.
Summary of the invention
(1) technical problem that will solve
The object of this invention is to provide a kind of starting-up method that can increase the Power Station Turbine group of rotary wheel of water turbine fatigue life.
(2) technological scheme
The present invention is achieved by the following technical solutions:
A starting-up method for Power Station Turbine group, this starting-up method adopts speed regulator to carry out one-part form or multi-section type start; In stator opening process, guide vane opening is opened speed by setting in time and is increased, and makes the ratio linearly slope of guide vane opening and time.
Wherein, in start process, stator is opened into the setting aperture larger than no-load opening to set unlatching speed; Then, the rotating speed along with water turbine set stator increases and reduces guide vane opening, grid-connected when water turbine set stator reaches rated speed.The technique effect of this technological scheme is, by stator being opened into the setting aperture larger than no-load opening, enabling guide vane opening rapid adjustment, adapting to different heads.
Preferably, it is 0.25% no-load opening/second that speed is opened in the setting that stator is opened, and described setting aperture is 1.3 times of no-load opening.The technique effect of this technological scheme is, under making runner stator crown lateral stress and stator crown, ring lateral stress obtains the most effectively reducing.
Further, the method reducing guide vane opening is: when the rotating speed of stator is 45Hz, guide vane opening is adjusted to no-load opening 1.2 times; After stator rotating speed is 47.5Hz, guide vane opening is no-load opening.This technological scheme effectively can reduce guide vane opening when reducing, effect of stress suffered by ring side under stator crown lateral stress and crown.
Wherein, the starting-up method of described water turbine set adopts one-part form starting-up method: stator is with grid-connected after set unlatching speed and being opened into setting speed from complete shut-down.The effect of this technological scheme is, while stator can be opened fast, reduces effect of stress suffered by ring side under stator crown lateral stress and crown.
Preferably, it is 0.5% no-load opening/second that speed is opened in the setting of described stator, and stator is grid-connected after being opened into the rated speed of 97%.Adopt above-mentioned setting to open speed and stator setting aperture, make the minimizing stress effect that stator reaches best.
Wherein, the starting-up method of described water turbine set adopts multi-section type starting-up method, comprises the following steps:
S1 stator is opened into setting aperture from complete shut-down with the first setting opening speed;
S2 keeps this setting aperture, until rotating speed reaches setting speed;
S3 stator is opened into the second setting opening speed the guide vane opening being greater than no-load opening again;
S4 keeps this guide vane opening, until stator rotating speed is grid-connected after rising to 97% of rated speed.
This technological scheme adopts multi-section type start-up mode, steadily rise to make generating unit speed and operate, unlikely speed overshoot is excessive, is beneficial to unit simultaneous interconnecting.
Preferably, in step S1, stator is opened into 3% no-load opening from complete shut-down with the speed of 0.5 no-load opening/second, makes stator open stage comparatively quick, is convenient to speed regulator operation.
Further, in step S2, keep this 3% no-load opening, until rotating speed reaches the rated speed of 25%.Guide vane opening described in employing and stator rotating speed, the guide vane opening made steadily rises.
Further again, in step S3, stator is opened into 103% no-load opening with 1.5% no-load opening/second speed again.This technological scheme reduces stator opening speed, is convenient to speed regulator to the control of opening, makes unlatching more steady, reduce effect of stress suffered by stator.
(3) beneficial effect
Compare with product with prior art, the present invention has the following advantages:
The soft start starting-up method of Power Station Turbine group provided by the invention, the soft start starting-up method of Power Station Turbine group, alleviate the effect to stress suffered by water turbine set stator in start process, the dynamic stress peak value of ring side under stator is declined, what bring thus is can increase fatigue life of runner stator to reach many times, reduces cost of production.
Accompanying drawing explanation
Fig. 1 is guide vane opening and the speed curves figure of existing water turbine set starting-up method;
Fig. 2 is the runner stator crown lateral stress figure of existing water turbine set starting-up method;
Fig. 3 is ring lateral stress figure under the runner stator crown of existing water turbine set starting-up method;
Fig. 4 is guide vane opening and the speed curves figure of water turbine set starting-up method in the embodiment of the present invention one;
Fig. 5 is the runner stator crown lateral stress figure of the water turbine set starting-up method of the embodiment of the present invention one;
Fig. 6 is ring lateral stress figure under the runner stator of the water turbine set starting-up method of the embodiment of the present invention one;
Fig. 7 is the guide vane opening plotted curve of water turbine set starting-up method in the embodiment of the present invention two;
Fig. 8 is the guide vane opening plotted curve of water turbine set starting-up method in the embodiment of the present invention three.
Embodiment
Understand for the ease of those of ordinary skill in the art and implement the present invention, below in conjunction with the drawings and the specific embodiments, the present invention is described in further detail.
The present embodiment provides a kind of starting-up method of Power Station Turbine group, and this starting-up method adopts speed regulator to carry out one-part form or multi-section type start; In stator opening process, guide vane opening is opened speed by setting in time and is increased, and makes the ratio linearly slope of guide vane opening and time.By the starting-up method of linear gradient, thus make in start process, under the stator of water turbine set, the dynamic stress peak value of ring side declines, make to increase many times the fatigue life of runner stator, avoid often keeping in repair stator, delay manufacturing schedule, reduces cost of production.
Embodiment one
In water power plant, use speed regulator in water turbine set start process, as shown in the plotted curve of Fig. 4, to be opened into guide vane opening be setting multiple more than no-load opening set unlatching speed to make to lead leaf divergence; Rotating speed along with water turbine set stator increases and reduces guide vane opening, grid-connected when water turbine set stator reaches rated speed.Power plant's head is 164m-251m, and be provided with 6 intervals, the no-load opening in each interval is corresponding with head.Because the no-load opening under different heads is different, changes with governor change as speed regulator cannot realize no-load opening parameter, then adopt the guide vane opening that the ratio no-load opening of expectation is large, thus be convenient to adjustment.
Particularly, the speed that stator is opened is 0.25% no-load opening/second, and described guide vane opening is 1.3 times of no-load opening.
Wherein, the method reducing guide vane opening is: when the rotating speed of water turbine set stator is 45Hz, guide vane opening is adjusted to no-load opening 1.2 times; After stator rotating speed is 47.5Hz, guide vane opening is no-load opening.
Detect known by experiment, as shown in stress analysis figure in Fig. 5 and Fig. 6, by the starting-up method of above-mentioned water turbine set, draw with the measurement of comparison analysis of original stator dynamic stress: under stator, the dynamic stress of ring side is down to about 200MPa by original peak value 340MPa; About 30MPa is then down to by 55MPa in stator crown side, and the available machine time increase only 20 seconds, increases to 140s by original 120s.
Above-mentioned soft start embodiment shows that soft start rule improves dynamic stress on stator, replaces former startup rule by soft start scheme.Method fatigue life calculating stator is particularly as follows: unit start runs, and obtains the strain data of relevant position.The strain recorded is converted to stress.Its Calculation of Fatigue Life fatigue damage is calculated according to unit operation record based on the fatigue curve of guide vane material with rain flow method statistics load period, accumulated fatigue is damaged, finally obtain fatigue life, concrete results of measuring can draw, the starting-up method of the present embodiment, makes to increase by 2 times the fatigue life of stator.
Embodiment two
The starting-up method of described water turbine set adopts one-part form starting-up method: plotted curve is as shown in Figure 7 known, and stator is with grid-connected after set unlatching speed and being opened into setting ratio rated speed from complete shut-down.
Wherein, it is 0.5% no-load opening/second that speed is opened in the setting of described stator, and stator is grid-connected after being opened into the rated speed of 97%.
By the starting-up method of linear gradient, the dynamic stress peak value of ring side under the stator of water turbine set is declined, the fatigue life of runner stator is increased, avoid often keeping in repair stator, in addition, adopt one-part form starting-up method, shorten the start time used, enhance productivity.
Embodiment three
As shown in Figure 8, the starting-up method of described water turbine set adopts multi-section type starting-up method, comprises the following steps:
S1 stator is opened into the no-load opening of setting ratio with the first setting opening speed from complete shut-down, particularly, stator is opened into 3% no-load opening from complete shut-down with the speed of 0.5 no-load opening/second.
S2 keeps the no-load opening of this setting ratio, until rotating speed reaches the rated speed of setting ratio; Particularly, stator keeps this 3% no-load opening, until rotating speed reaches the rated speed of 25%.
S3 stator is opened into the second setting opening speed the guide vane opening being greater than no-load opening again; Particularly, stator is opened into 103% no-load opening with 1.5% no-load opening/second speed again.Because under different head, the specified aperture of stator of water turbine set is different, changes, then can adopt the maximum no-load opening of expectation if speed regulator cannot realize no-load opening with change of water level.
S4 keeps this guide vane opening, until stator rotating speed is grid-connected after rising to 97% of rated speed.
Multi-section type start-up mode is adopted in this embodiment, steadily rise to make generating unit speed and operate, unlikely speed overshoot is excessive, be beneficial to unit simultaneous interconnecting and adopt above-mentioned optimised water turbine set starting-up method, the dynamic stress peak value of ring side under the stator of water turbine set is declined, the fatigue life of runner stator is increased, can make increase twice the fatigue life of water turbine set stator, avoid often keeping in repair stator
Above embodiment is only one embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.Its concrete structure and size can adjust according to actual needs accordingly.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (10)
1. a starting-up method for Power Station Turbine group, is characterized in that, this starting-up method adopts speed regulator to carry out one-part form or multi-section type start; In stator opening process, guide vane opening is opened speed by setting in time and is increased, and makes the ratio linearly slope of guide vane opening and time.
2. the starting-up method of Power Station Turbine group according to claim 1, is characterized in that,
In start process, stator is opened into the setting aperture larger than no-load opening to set unlatching speed; Then, the rotating speed along with water turbine set stator increases and reduces guide vane opening, grid-connected when water turbine set stator reaches rated speed.
3. the starting-up method of Power Station Turbine group according to claim 2, is characterized in that, it is 0.25% no-load opening/second that speed is opened in the setting that stator is opened, and described setting aperture is 1.3 times of no-load opening.
4. the starting-up method of Power Station Turbine group according to claim 3, is characterized in that, the method reducing guide vane opening is: when the rotating speed of stator is 45Hz, guide vane opening is adjusted to no-load opening 1.2 times; After stator rotating speed is 47.5Hz, guide vane opening is no-load opening.
5. the starting-up method of Power Station Turbine group according to claim 1, is characterized in that, the starting-up method of described water turbine set adopts one-part form starting-up method: stator is with grid-connected after set unlatching speed and being opened into setting speed from complete shut-down.
6. the starting-up method of Power Station Turbine group according to claim 5, is characterized in that, it is 0.5% no-load opening/second that speed is opened in the setting of described stator, and stator is grid-connected after being opened into the rated speed of 97%.
7. the starting-up method of Power Station Turbine group according to claim 1, is characterized in that, the starting-up method of described water turbine set adopts multi-section type starting-up method, comprises the following steps:
S1 stator is opened into setting aperture from complete shut-down with the first setting opening speed;
S2 keeps this setting aperture, until rotating speed reaches setting speed;
S3 stator is opened into the second setting opening speed the guide vane opening being greater than no-load opening again;
S4 keeps this guide vane opening, until stator rotating speed is grid-connected after rising to 97% of rated speed.
8. the starting-up method of Power Station Turbine group according to claim 7, is characterized in that, in step S1, stator is opened into 3% no-load opening from complete shut-down with the speed of 0.5 no-load opening/second.
9. the starting-up method of Power Station Turbine group according to claim 8, is characterized in that, in step S2, keeps this 3% no-load opening, until rotating speed reaches the rated speed of 25%.
10. the starting-up method of Power Station Turbine group according to claim 9, is characterized in that, in step S3, stator is opened into 103% no-load opening with 1.5% no-load opening/second speed again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410752180.9A CN104500326A (en) | 2014-12-09 | 2014-12-09 | Starting-up method for hydraulic turbine set of power station |
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| CN201410752180.9A CN104500326A (en) | 2014-12-09 | 2014-12-09 | Starting-up method for hydraulic turbine set of power station |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298735A (en) * | 2015-12-15 | 2016-02-03 | 张方庆 | Safe and reliable bulb tubular turbine generator power-on and power-off control method |
| CN106485064A (en) * | 2016-09-28 | 2017-03-08 | 华中科技大学 | A kind of pump-storage generator hydraulic turbine condition intelligence starting-up method |
| CN108304615A (en) * | 2017-12-28 | 2018-07-20 | 华中科技大学 | A kind of the Bi-objective preferred method and system of pump-storage generator Running test |
| CN109026758A (en) * | 2018-06-08 | 2018-12-18 | 中国电力科学研究院有限公司 | It is a kind of for controlling the method and device of pumped storage unit pump operating condition start-up course |
| CN109416013A (en) * | 2016-07-05 | 2019-03-01 | 法国电力公司 | Method for optimizing the adjusting of the gate of at least one hydraulic turbo machine |
| CN113153616A (en) * | 2021-03-23 | 2021-07-23 | 中国水利水电科学研究院 | Hydroelectric generating set power adjusting method and control system based on S-curve algorithm and hydroelectric generating set |
| CN114483432A (en) * | 2021-12-16 | 2022-05-13 | 华能澜沧江水电股份有限公司 | Electric open-limit control method for speed regulator of high-head and large-amplitude hydropower station unit |
| JP7431682B2 (en) | 2020-06-19 | 2024-02-15 | 株式会社東芝 | How to start a Francis turbine and Francis turbine |
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2014
- 2014-12-09 CN CN201410752180.9A patent/CN104500326A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298735A (en) * | 2015-12-15 | 2016-02-03 | 张方庆 | Safe and reliable bulb tubular turbine generator power-on and power-off control method |
| CN109416013A (en) * | 2016-07-05 | 2019-03-01 | 法国电力公司 | Method for optimizing the adjusting of the gate of at least one hydraulic turbo machine |
| CN109416013B (en) * | 2016-07-05 | 2020-10-27 | 法国电力公司 | Method for optimizing the adjustment of a sluice of at least one hydraulic turbine |
| CN106485064A (en) * | 2016-09-28 | 2017-03-08 | 华中科技大学 | A kind of pump-storage generator hydraulic turbine condition intelligence starting-up method |
| CN108304615A (en) * | 2017-12-28 | 2018-07-20 | 华中科技大学 | A kind of the Bi-objective preferred method and system of pump-storage generator Running test |
| CN109026758A (en) * | 2018-06-08 | 2018-12-18 | 中国电力科学研究院有限公司 | It is a kind of for controlling the method and device of pumped storage unit pump operating condition start-up course |
| CN109026758B (en) * | 2018-06-08 | 2022-03-04 | 中国电力科学研究院有限公司 | Method and device for controlling working condition starting process of water pump of pumping and storage unit |
| JP7431682B2 (en) | 2020-06-19 | 2024-02-15 | 株式会社東芝 | How to start a Francis turbine and Francis turbine |
| CN113153616A (en) * | 2021-03-23 | 2021-07-23 | 中国水利水电科学研究院 | Hydroelectric generating set power adjusting method and control system based on S-curve algorithm and hydroelectric generating set |
| CN114483432A (en) * | 2021-12-16 | 2022-05-13 | 华能澜沧江水电股份有限公司 | Electric open-limit control method for speed regulator of high-head and large-amplitude hydropower station unit |
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Owner name: XIAOWAN HYDROPOWER PLANT OF HUANENG LANCANG RIVER Free format text: FORMER OWNER: HUANENG LANCANG RIVER HYDROPOWER CO., LTD. Effective date: 20150409 |
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Address after: 650214, No. 1, Century City Road, Guandu District, Yunnan, Kunming Applicant after: HUANENG LANCANG RIVER HYDROPOWER Inc. Address before: 650214, No. 1, Century City Road, Guandu District, Yunnan, Kunming Applicant before: HUANENG LANCANG RIVER HYDROPOWER Co.,Ltd. |
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Free format text: CORRECT: ADDRESS; FROM: 650214 KUNMING, YUNNAN PROVINCE TO: 675702 DALI BAI AUTONOMOUS PREFECTURE, YUNNAN PROVINCE Free format text: CORRECT: APPLICANT; FROM: HUANENG LANTSANG HYDROELECTRIC CO., LTD. TO: HUANENG LANCANG RIVER HYDROPOWER CO., LTD. |
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Effective date of registration: 20150409 Address after: 675702 Xiaowan power plant, Xiaowan Town, Nanjian County, Dali, Yunnan Applicant after: XIAOWAN HYDRAULIC POWER PLANT OF HUANENG LANCANG RIVER HYDROPOWER CO.,LTD. Address before: 650214, No. 1, Century City Road, Guandu District, Yunnan, Kunming Applicant before: HUANENG LANCANG RIVER HYDROPOWER Inc. |
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Application publication date: 20150408 |