CN105863962A - Method for controlling recut-in of wind-driven power generators on basis of wind speed and time combination dead zones - Google Patents
Method for controlling recut-in of wind-driven power generators on basis of wind speed and time combination dead zones Download PDFInfo
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- 230000032683 aging Effects 0.000 claims description 8
- 230000005684 electric field Effects 0.000 claims description 5
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- 125000004122 cyclic group Chemical group 0.000 description 1
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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
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
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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
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses a method for controlling recut-in of wind-driven power generators on the basis of wind speed and time combination dead zones. The method includes resetting time counters when the wind-driven power generators are cut out, detecting current wind speeds and carrying out accumulative timing by the time counters if the current wind speeds are lower than recut-in wind speeds of the wind-driven power generators; carrying out zero clearing on the time counters if the current wind speeds are higher than the recut-in wind speeds and detecting the current wind speeds again; judging whether the accumulative time in which the current wind speeds are continuously lower than the recut-in wind speeds is longer than time dead zones or not, carrying out recut-in on the wind-driven power generators if the accumulative time is longer than the time dead zones and the current wind speeds are lower than the recut-in wind speeds, connecting the wind-driven power generators to a grid and generating power. The method has the advantages that recut-in dead zones are added into the existing basis of only wind speed dead zones between cut-out wind speeds and recut-in wind speeds, the wind-driven power generators are only started under conditions that the current wind speeds are lower than the recut-in wind speeds and the duration is longer than the time dead zones, accordingly, repeated starting and stopping of the wind-driven power generators under strong-wind conditions can be prevented, and possible hazards due to frequent starting and stopping of the wind-driven power generators under the strong-wind conditions can be effectively reduced.
Description
Technical field
The present invention relates under a kind of contour wind friction velocity of typhoon, wind power generating set based on wind speed ageing dead band cut control method again.
Background technology
Wind energy turbine set many places are in hill, and running environment is severe, and repair and maintenance is costly.The particularly marine and Wind turbines in mountain area, once breaks down, owing to having inconvenient traffic and the factor repair and maintenance such as weather conditions is extremely difficult.Statistics shows, the operation and maintenance cost of land wind energy turbine set accounts for about the 10% of wind power generating set generating income, and the operation and maintenance cost of marine wind electric field accounts for about the 30% of wind power generating set generating income.
In running, the mechanical operating parts such as the bearing of wind-driven generator, gear are subjected to certain mechanical load, mechanical load and twisting resistance that when wind speed changes greatly, power section is born also can occur bigger variation accordingly, easily cause the fault of mechanical gyro unit.Under the extreme weather conditions such as typhoon, wind-driven generator stop in emergency cut out with wind speed reduce restart during, in addition to dead load, random load, properly functioning steady state loading and cyclic load, also it is subjected to transient load and the impact load of typhoon effect produced by brake, fan blade is it may happen that acutely reverse chatter, easily induce the system failures such as pitch regulation, driftage, the probability of malfunction making mechanical part significantly raises, and has a strong impact on the safe and stable operation of wind-driven generator.The disorderly closedown that component failure causes will reduce the availability of wind power generating set, and impact is generated electricity by way of merging two or more grid systems.Because of wind speed big ups and downs under typhoon, when wind speed will start again less than blower fan when cutting wind speed again, and the safety and reliability of wind-driven generator may be produced prominent impact at frequent starting under typhoon with cut out shutdown.According to statistics, the availability of land electromotor is typically between 95% to 99%；Marine wind electric field is obvious by tidal effect due to O&M operation, both the bad working environments such as typhoon may have been faced, it is also possible to face sensible difficult problem, and marine upkeep operation effective time is short, security risk is big and needs major repair to equip, availability is substantially less than land blower fan, and some wind energy turbine set availabilitys are the most only between 60% to 70%.Therefore, as being avoided that wind power generating set repeatedly starting and stopping under typhoon, not only can reduce fault rate and repair and maintenance expense expenditure, also can improve Wind turbines availability, for improving the economic benefit of wind energy turbine set, there is important real value.
In order to protect wind-driven generator, it is to avoid bear the wind load of super design load under high wind conditions, wind-driven generator, when detecting that wind speed is more than cut-out wind speed (generally 25m/s), can be shut down in feathering brake.It is pointed out that cut-out wind speed is the fixed numbers given by the design of wind power generating set producer, when wind speed fluctuates up and down at cut-out wind speed, wind-driven generator will frequent starting, the probability of malfunction of wind-driven generator may be significantly improved.In order to avoid wind-driven generator frequent start-stop under high wind conditions causes damage, since 2008, what many wind-driven generator producers started to introduce wind-driven generator cuts wind speed again, i.e. after wind-driven generator experience high wind cuts out, one value less than cut-out wind speed is set as cutting wind speed (mostly being 23m/s) again, only at current wind speed less than when cutting wind speed again, just restart wind-driven generator, utilize cut-out wind speed and the wind speed dead band cut again between wind speed, it is to avoid wind-driven generator is frequent start-stop under high wind conditions.It is pointed out that because wind speed rate of change is apparently higher than normal condition under high wind conditions, individually arrange under cut-out wind speed cut that the wind speed dead band that wind speed formed might not effectively reduce wind power generating set again cut out number of times.
Summary of the invention
nullThe technical problem to be solved is: in above-mentioned prior art，Wind-driven generator may cut out under the conditions of typhoon repeatedly、Cut again and cut out the most again，It is easily caused element fault、The problem affecting wind-driven generator availability，A kind of wind-driven generator based on wind speed ageing dead band is provided to cut control method again，Use in the control system of wind-driven generator in existing cut wind speed dead band again on the basis of be further added by the method in cut-in timing dead band again，Control is cut again after wind-driven generator cuts out，According to current wind speed whether continuously less than cutting wind speed again after i.e. wind-driven generator cuts out，And the current wind speed of only detection be consistently less than the time cutting wind speed again more than time dead band time control wind-driven generator start incision more just now and generate electricity by way of merging two or more grid systems，It is particularly suitable for frequency and suffers the coastal and offshore wind generating of typhoon.
In order to solve above-mentioned technical problem, the technical solution adopted in the present invention is: control method cut again by a kind of wind-driven generator based on wind speed ageing dead band, and the method step is as follows:
Step A: when wind speed exceedes the cut-out wind speed that wind-driven generator sets, wind-driven generator cuts out, shuts down along slurry, enters step B；
Step B: in wind power generator control system, the time counter of installing resets, starts timing；
Step C: detect current wind speed；
Step D: judge that whether this current wind speed cuts wind speed again less than wind-driven generator, if this current wind speed cuts wind speed again more than or equal to wind-driven generator, then proceeds to step B；Otherwise time counter adds up timing, enters step E；
Step E: judge whether the time that time counter adds up is more than time dead band, if less than time dead band, then proceeding to step C；If more than or equal to time dead band, entering step F；
Step F: wind-driven generator is cut and generated electricity by way of merging two or more grid systems.
Above-mentioned wind-driven generator cut again wind speed be set to wind-driven generator manufacture factory settings wind-driven generator cut wind speed setting value again, for not setting the wind-driven generator cutting wind speed again, using the wind speed less than cut-out wind speed 2-3m/s as cutting wind speed again.
Being set to of above-mentioned time dead band: the wind-driven generator time the dead time of land 1,2 Lei Feng district wind energy turbine set is 60-120min, the wind-driven generator time the dead time of land 3,4 Lei Feng district wind energy turbine set is 10-60min；The time the dead time of marine wind electric field is 60-180min.
The present invention sets up time counter on the basis of original wind power generator control system, and increases the time dead band cut again.After wind-driven generator cuts out, time counter resets to reset and also detects current wind speed, if current wind speed is less than when cutting wind speed again, time counter adds up timing, and otherwise time counter resets and resets.Time dead band is to add up, according to wind energy turbine set historical wind speed, the time period determined, after wind-driven generator experience typhoon cuts out, it is consistently less than, with the current wind speed of detection, the duration cutting wind speed again and cuts the sufficient condition of generating more than time dead band for controlling wind-driven generator the most again.
So; the present invention increases the time dead band cut again in wind power generator control system so that the wind-driven generator size of current wind speed according to detection and wind speed after cutting out shutdown are consistently less than to be cut the duration of wind speed again and judge whether to restart and generate electricity by way of merging two or more grid systems；Thus, under the conditions of wind-driven generator experience high wind cuts out, no longer whether start wind-driven generator less than the wind speed of cutting again of wind-driven generator for unique foundation with current wind speed.Under the conditions of wind-driven generator experience high wind cuts out, to current, meet current wind speed less than cutting wind speed again and current wind speed is consistently less than the time cutting wind speed again more than just startup wind-driven generator during the time dead band arranged simultaneously, can reduce and under high wind conditions, cut out probability again, it is to avoid start under high wind and cut out the infringement to wind-driven generator again.Therefore, this method can significantly reduce the probability of repeatedly starting and stopping under the conditions of wind-driven generator typhoon, contributes to reducing the aging of wind-driven generator and loss.
Compared with prior art, the present invention adds the cut-in timing dead zone control method again after wind-driven generator cuts out in original wind power generator control system, current wind speed is consistently less than the time cutting wind speed again by the time counter calculating installed additional, only cut wind speed again and at current wind speed to currently less than wind-power electricity generation motivation, current wind speed is consistently less than wind-driven generator and cuts the time of wind speed again more than just starting wind-driven generator under conditions of time dead band, it is avoided that wind-driven generator repeatedly starts under high wind conditions and shuts down, effectively reduce high wind conditions apparatus for lower wind electromotor start and shut down the harm being likely to result in.
Accompanying drawing explanation
Fig. 1 is that existing wind-power electricity generation motivation is cut in control system wind speed again and fluctuated up and down schematic diagram at wind-driven generator cut-out wind speed.
Fig. 2 is the logic diagram that control cut again by present invention wind-driven generator based on wind speed time dead band.
Detailed description of the invention
The current wind speed that existing wind-driven generator is measured according to hub height air speed measuring apparatus and cut-out wind speed and cut wind speed again and cut control again, its working method is as shown in Figure 1.After current wind speed exceedes the cut-out wind speed of wind-driven generator, the brake of wind-driven generator feathering is shut down；Until current wind speed decreased to when cutting below wind speed again, start wind-driven generator and generate electricity by way of merging two or more grid systems.The conventional cut-out wind speed (mostly being 25m/s) set and cut the wind speed dead band being provided with 2-3m/s between wind speed (mostly being 23m/s or 22m/s) again in existing wind power generator control system.But owing under high wind conditions, wind speed rate of change is big, it is separately provided wind speed dead band for avoiding wind-driven generator to restart after cutting out shutdown once more cutting out the effect of shutdown inconspicuous.
Control method cut again by the wind-driven generator based on the dead band prediction of wind speed time that the present invention implements is to increase the time dead band cut again on existing wind power generator control system to realize.Specifically, it is as follows that control method cut again by this wind-driven generator, in conjunction with seeing Fig. 2:
Step A: when wind speed exceedes the cut-out wind speed that wind-driven generator sets, and wind-driven generator cuts out, feathering is shut down, enter step B；
Step B: in wind power generator control system, the time counter of installing resets, starts timing；
Step C: detect current wind speed；
Step D: judge that whether this current wind speed cuts wind speed again less than wind-driven generator, if this current wind speed cuts wind speed again more than or equal to wind-driven generator, then proceeds to step B；Otherwise time counter adds up timing, enters step E；
Step E: judge whether the time that time counter adds up is more than time dead band, if less than time dead band, then proceeding to step C；If more than or equal to time dead band, entering step F；
Step F: wind-driven generator is cut and generated electricity by way of merging two or more grid systems.
Wind-driven generator cut that wind speed directly uses wind-driven generator factory settings again cut wind speed again；Relatively early model producer is not provided with cutting the wind-driven generator of wind speed again, cut-out wind speed 2m/s-3m/s can be set lower than as cutting wind speed again.Time dead band is together decided on corresponding Maintenance and Repair cost and possible loss generated energy by the number of times that cuts out being likely to reduced.1,2 Lei Feng district wind energy turbine set preferable for land wind-resources condition, because annual utilizes hourage high, the Dead Time that can arrange 60-120min cuts out number of times with reduction as far as possible；For 3, the 4 Lei Feng district wind energy turbine set that land wind-resources condition is general, because utilizing hourage few and before and after typhoon, wind-force powerful period wind power generating set can completely be sent out, for ensure power benefit 10-60min can be set within Dead Time；For marine wind electric field, because maintenance difficulty and disbursement are high, the Dead Time of 60-180min can be set.
The inventive method is to meet with after high wind cuts out according to the result to wind speed real-time measurement at wind-driven generator, the cumulative time of the cut-out wind speed being consistently less than wind-driven generator when measuring wind speed in real time exceedes the time dead band of setting and measuring wind speed in real time now and cuts wind speed again less than wind-driven generator, when the two condition meets simultaneously, just allow wind-driven generator to cut again to generate electricity by way of merging two or more grid systems, if according to the result of measuring wind speed in real time, there is any one condition to be unsatisfactory for, do not allow wind-driven generator to cut again.
As a example by Fig. 1, arranging 30 minutes is time dead band, and wind-driven generator cut out shutdown because wind speed higher than cut-out wind speed when 50 minutes；When 80 minutes, wind speed, significantly lower than cutting wind speed again, generates electricity by way of merging two or more grid systems as individually used wind speed dead band will cut startup again, but under time dead band effect, is consistently less than and cuts wind speed again and will remain shut off state less than 30 minutes；When 110 minutes, wind speed is again higher than cut-out wind speed, and timer reset, that thus can reduce First air power generator cuts out operation.When 180 minutes, wind speed is less than cutting wind speed and persistent period again more than 30 minutes, therefore allows when 210 minutes wind-driven generator to cut again and generate electricity by way of merging two or more grid systems.
According to the measuring and calculating of 1992 to the 2014 years air speed datas in weather station, Changzhou, Hong Kong, cut-out wind speed be the wind-driven generator of 25m/s because of wind speed recurrent fluctuations during typhoon, cut out altogether shutdown 299 times.When individually using 23m/s to cut wind speed (2m/s wind speed dead band) again, cutting out machine stop times and be reduced to 188 times, reduce nearly 1/3, the generating dutation of corresponding loss is 82 hours；As coordinated 50 minutes dead bands on 23m/s wind speed dead band, then wind-driven generator cuts out machine stop times and will further decrease to 105 times, reduces about 2/3, and the generating dutation of loss is about 192 hours.
Claims (3)
1. control method cut again by a wind-driven generator based on wind speed ageing dead band, it is characterised in that the method step is as follows:
Step A: when wind speed exceedes the cut-out wind speed that wind-driven generator sets, and wind-driven generator cuts out, feathering is shut down, enter step B；
Step B: in wind power generator control system, the time counter of installing resets, starts timing；
Step C: detect current wind speed；
Step D: judge that whether current wind speed cuts wind speed again less than wind-driven generator, if this current wind speed cuts wind speed again more than or equal to wind-driven generator, then proceeds to step B；Otherwise time counter adds up timing, enters step E；
Step E: judge whether the time that time counter adds up is more than time dead band, if less than time dead band, then proceeding to step C；If more than or equal to time dead band, entering step F；
Step F: wind-driven generator is cut and generated electricity by way of merging two or more grid systems.
2. control method cut again by wind-driven generator based on wind speed ageing dead band as claimed in claim 1, it is characterized in that, described wind-driven generator cut again wind speed be set to wind-driven generator manufacture factory settings wind-driven generator cut wind speed setting value again；Wind-driven generator is not provided with cutting wind speed setting value again, with the wind speed less than cut-out wind speed 2m/s-3m/s for cutting wind speed again.
3. control method cut again by wind-driven generator based on wind speed ageing dead band as claimed in claim 1, it is characterized in that, being set to of described time dead band: the wind-driven generator time the dead time of land 1,2 Lei Feng district wind energy turbine set is 60-120min, the wind-driven generator time the dead time of land 3,4 Lei Feng district wind energy turbine set is 10-60min；The time the dead time of marine wind electric field is 60-180min.
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Cited By (3)
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| CN112502899A (en) * | 2020-11-30 | 2021-03-16 | 东方电气风电有限公司 | Consumption reduction method for wind generating set |
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Application publication date: 20160817 |