CN105508134A - Method and device for increasing wind energy utilization efficiency of wind generator set - Google Patents
Method and device for increasing wind energy utilization efficiency of wind generator set Download PDFInfo
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- CN105508134A CN105508134A CN201510913825.7A CN201510913825A CN105508134A CN 105508134 A CN105508134 A CN 105508134A CN 201510913825 A CN201510913825 A CN 201510913825A CN 105508134 A CN105508134 A CN 105508134A
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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
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/328—Blade pitch angle
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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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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
The invention belongs to the technical field of control for large wind generator sets, and particularly relates to a method and a device for increasing the wind energy utilization efficiency of a wind generator set, which are used for increasing the wind energy utilization efficiency of the wind generator set when a wind speed in a scene is less than a rated wind speed. The method comprises the following steps: obtaining a wind speed at the current time and a wind speed at the last time; evaluating the change difference value of the wind speed at the current time and the wind speed at the last time; obtaining an output pitch angle of a variable-pitch controller, and judging whether the output pitch angle is zero or not; and if the output pitch angle is zero, carrying out setting adjustment on the output pitch angle according to the change difference value.
Description
Technical field
The invention belongs to Large-scale Wind Turbines control technique field, particularly relate to a kind of method and the device that improve wind power generating set wind energy utilization efficiency, for when the wind speed in scene is less than rated wind speed, improve the wind energy utilization efficiency of wind power generating set.
Background technique
Time below rated wind speed, wind power generating set all will carry out best power tracing control, but wind energy is a kind of randomness, the uncertain energy, especially at the wind field in some mountain areas, the large change of wind speed turbulivity is fast, and Large-scale Wind Turbines vane rotary inertia is large, cannot follow the tracks of wind speed change fast, the therefore frequent off-target state of wind power generating set, impeller is exerted oneself degradation, rotating-speed tracking is more slow, causes power loss.
At present below rated wind speed, conventional method is that wind power generating set control blade maintains zero degree, and do not carry out change oar, when wind speed change is very fast, Wind energy extraction efficiency significantly declines.
Summary of the invention
For the problems referred to above, embodiments of the invention provide a kind of method and the device that improve wind power generating set wind energy utilization efficiency, can tackle wind speed change fast, turbulivity Qiang Feng district, the tracking wind energy efficiency of wind power generating set during to improve below rated wind speed.
For achieving the above object, embodiments of the invention adopt following technological scheme to be achieved.
Technological scheme one:
Improve a method for wind power generating set wind energy utilization efficiency, described method comprises the steps:
Obtained wind speed and the wind speed in a upper moment of current time;
According to wind speed and the wind speed in a described upper moment of described current time, asked for the wind speed of described current time and the change difference of the wind speed in a described upper moment;
Obtain the output propeller pitch angle becoming oar controller, judge whether described output propeller pitch angle is zero;
If described output propeller pitch angle is zero, then according to described change difference, setting is carried out to described output propeller pitch angle and regulate.
The feature of technological scheme one and being further improved to:
(1) wind speed of described current time and the wind speed in a described upper moment are the wind speed by obtaining after low-pass filter filtering higher harmonics.
(2) if described output propeller pitch angle is zero, then according to described change difference, setting is carried out to described output propeller pitch angle and regulates, be specially:
If the output propeller pitch angle of described change oar controller is zero, then according to the wind speed of current time and the change difference of the wind speed in a upper moment and the product of gain parameter, described output propeller pitch angle was adjusted to setting value.
(3) span of described gain parameter is in the scope of-0.1 ~ 0.
(4) described method also comprises the adjustment thresholding of default described output propeller pitch angle, when the absolute value of described setting value is greater than described adjustment doors in limited time, carries out amplitude limit to described setting value.
Technological scheme two:
Improve a device for wind power generating set wind energy utilization efficiency, described device comprises:
Acquisition module, for obtaining wind speed and the wind speed in a upper moment of current time;
Computing module, for according to the wind speed of described current time and the wind speed in a described upper moment, asked for the wind speed of described current time and the change difference of the wind speed in a described upper moment;
Described acquisition module, also for obtaining the output propeller pitch angle becoming oar controller;
Judge module, for judging whether described output propeller pitch angle is zero;
Adjustment module, if be zero for described output propeller pitch angle, then carry out setting according to described change difference to described output propeller pitch angle and regulates.
The feature of technological scheme two and being further improved to:
(1) wind speed of described current time and the wind speed in a described upper moment are the wind speed by obtaining after low-pass filter filtering higher harmonics.
(2) described adjustment module, if be zero specifically for the output propeller pitch angle of described change oar controller, was then adjusted to setting value according to the wind speed of current time and the change difference of the wind speed in a upper moment and the product of gain parameter by described output propeller pitch angle.
(3) span of described gain parameter is in the scope of-0.1 ~ 0.
(4) described device also bag clipping module, for presetting the adjustment thresholding of described output propeller pitch angle, when the absolute value of described setting value is greater than described adjustment doors in limited time, carries out amplitude limit to described setting value.
A kind of method and device improving wind power generating set wind energy utilization efficiency provided by the invention, in the process that wind power generating set is run, when wind speed changes suddenly, because wheel speed change is comparatively slow, blade is often in non-optimal tip speed ratio state, there is relatively high power loss, although now wind speed and power are all below rated wind speed and rated power, but by method provided by the invention, by finely tuning the propeller pitch angle of blade, the wind energy utilization efficiency of wind power generating set can be improved.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of method flow schematic diagram improving wind power generating set wind energy utilization efficiency that Fig. 1 provides for the embodiment of the present invention;
A kind of structural representation improving the device of wind power generating set wind energy utilization efficiency that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 be under different wind speed Cp relative to the curvilinear characteristic schematic diagram of wheel speed;
When Fig. 4 is different propeller pitch angle under same wind speed, Cp is relative to the curvilinear characteristic schematic diagram of wheel speed;
Tracking wind energy process of the present invention and conventional tracking wind energy process contrast schematic diagram when Fig. 5 is wind speed mutation;
Fig. 6 is the change oar control flow chart after adding the inventive method;
Fig. 7 is the Cp of wind speed the present invention and conventional tracking wind energy when rising suddenly, power and propeller pitch angle simulation curve contrast schematic diagram;
Fig. 8 is the Cp of wind speed the present invention and conventional tracking wind energy when declining suddenly, power and propeller pitch angle simulation curve contrast schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of method improving wind power generating set wind energy utilization efficiency, and as shown in Figure 1, described method comprises:
Obtained wind speed and the wind speed in a upper moment of current time.
Wherein, the wind speed of described current time and the wind speed in a described upper moment are the wind speed by obtaining after low-pass filter filtering higher harmonics.
According to wind speed and the wind speed in a described upper moment of described current time, asked for the wind speed of described current time and the change difference of the wind speed in a described upper moment.
Further, by the wind speed V of the wind speed of current time by the current time after low-pass filter to filtering higher harmonics
f(k), and the wind speed V wind speed in a described upper moment being obtained the upper moment after filtering higher harmonics by low-pass filter
f(k-1), wherein, k represents current time, and k-1 represents a moment.
Obtain the output propeller pitch angle becoming oar controller, judge whether described output propeller pitch angle is zero.
If described output propeller pitch angle is zero, then according to described change difference, setting is carried out to described output propeller pitch angle and regulate.
If described output propeller pitch angle is zero, then carry out setting according to described change difference to described output propeller pitch angle to regulate, be specially: if the output propeller pitch angle of described change oar controller is zero, then according to the wind speed of current time and the change difference of the wind speed in a upper moment and the product of gain parameter, described output propeller pitch angle be adjusted to setting value.
It should be noted that, described order exports propeller pitch angle β=KE
vafterwards, amplitude limiting processing is carried out to described output propeller pitch angle β.General, amplitude limiting processing is carried out to output propeller pitch angle, makes the excursion of propeller pitch angle in the amplitude range preset, the speed of response of system can be accelerated.
The embodiment of the present invention also provides a kind of device improving wind power generating set wind energy utilization efficiency, and as shown in Figure 2, described device comprises:
Acquisition module 1, for obtaining wind speed and the wind speed in a upper moment of current time.
Computing module 2, for according to the wind speed of described current time and the wind speed in a described upper moment, asked for the wind speed of described current time and the change difference of the wind speed in a described upper moment.
Described acquisition module 1, also for obtaining the output propeller pitch angle becoming oar controller.
Judge module 3, for judging whether described output propeller pitch angle is zero.
Adjustment module 4, if be zero for described output propeller pitch angle, then carry out setting according to described change difference to described output propeller pitch angle and regulates.
Further, the wind speed of described current time and the wind speed in a described upper moment are the wind speed by obtaining after low-pass filter filtering higher harmonics.
Described adjustment module 4, if be zero for the output propeller pitch angle of described change oar controller, was then adjusted to setting value according to the wind speed of current time and the change difference of the wind speed in a upper moment and the product of gain parameter by described output propeller pitch angle.
Concrete, if exporting propeller pitch angle β is zero, then regulate described output propeller pitch angle β=KE
v, wherein, E
vrepresented the wind speed of current time and the change difference of the wind speed in a upper moment, and E
v=V
f(k)-V
f(k-1), K represents gain parameter.
The span of described gain parameter K is in the scope of-0.1 ~ 0.
Further, described device is bag clipping module also, for presetting the adjustment thresholding of described output propeller pitch angle, when the absolute value of described setting value is greater than described adjustment doors in limited time, carries out amplitude limit to described setting value.
Concrete, regulate described output propeller pitch angle β=KE in described adjustment module
vafterwards, amplitude limiting processing is carried out to described output propeller pitch angle β.
A kind of method and device improving wind power generating set wind energy utilization efficiency provided by the invention, in the process that wind power generating set is run, when wind speed changes suddenly, because wheel speed change is comparatively slow, blade is often in non-optimal tip speed ratio state, there is relatively high power loss, although now wind speed and power are all below rated wind speed and rated power, but by method provided by the invention, by finely tuning the propeller pitch angle of blade, the wind energy utilization efficiency of wind power generating set can be improved.
The effect of technical solution of the present invention can be verified by following emulation experiment:
Described emulation experiment comprises the steps: 1) the Cp curve (Cp represents the power coefficient of wind power generating set) of different wind speed apparatus for lower wind generator set is calculated by bladed software, obtain the running of wind power generating set when wind speed changes; 2) the Cp curve of wind power generating set when calculating different propeller pitch angle under same wind speed by bladed software; 3) wind speed below rated wind speed and power below rated power time, wind power generating set is in the process run, when wind speed changes suddenly, because wheel speed change is slower, blade is often in non-optimal tip speed ratio state, there is relatively high power loss, regulated by the propeller pitch angle of technological scheme provided by the invention to blade, improve wind energy conversion system Wind energy extraction efficiency.
Fig. 3 be under different wind speed Cp relative to the curvilinear characteristic schematic diagram of wheel speed, wind speed is respectively 5m/s, 6m/s, 7m/s, and wherein, abscissa is wheel speed (rpm), when this figure describes different wind speed, wheel speed is Cp corresponding relation scope from 0rpm to 25rpm.The wheel speed of the maximum Cp of the larger correspondence of wind speed is also larger.
When Fig. 4 is different propeller pitch angle under same wind speed, Cp is relative to the curvilinear characteristic schematic diagram of wheel speed, and wind speed is 6m/s, propeller pitch angle corresponding 0 ° ,-1 ° and 1 ° respectively.Wherein, abscissa be wheel speed (rpm), this figure when describing different propeller pitch angle under same wind speed Cp relative to the curvilinear characteristic of wheel speed.Propeller pitch angle change is large, and maximum Cp declines and the wheel speed of correspondence increases, and whole curve is more steady, and during the slow-speed of revolution, the rising of Cp curve is accelerated, and declines slow during high rotating speed.Illustrate that wind-driven generator unit increases propeller pitch angle and is conducive to wind energy absorption when stall.
Tracking wind energy process of the present invention and conventional tracking wind energy process contrast schematic diagram when Fig. 5 is wind speed mutation, wind speed from V1=9m/s sudden change to V2=6m/s, when composition graphs 5 describes wind speed mutation in detail tracking wind energy process of the present invention and conventional tracking wind energy process as follows:
Wherein, 1. represent that wind speed is V1, propeller pitch angle is the Cp curve of 0 °; 2. represent that wind speed is V2, propeller pitch angle is the Cp curve of 0 °; 3. represent that wind speed is V2, propeller pitch angle is the Cp curve of 0.5 °; 4. represent that wind speed is V2, propeller pitch angle is the Cp curve of 1 °; 5. represent that wind speed is V2, propeller pitch angle is the Cp curve of 2 °; Wind speed V1 > V2, and A, B, B1, C, D, E and F are respectively the running state point of wind power generating set;
1, conventional tracking wind energy process: suppose that current wind speed is V1 (lower than rated wind speed), wind power generating set operates in the best power point A point that 1. curve is gone up, and now wheel speed is set to SArpm; If wind speed drops to V2 fast from V1 suddenly, wheel speed change is comparatively slow approximate constant, and the A point that 1. wind power generating set running state is gone up by curve becomes the B1 point that 2. curve is gone up, and then 2. moves to F point according to maximal wind-power tracking strategy from B1 point along curve.Whole process is A-> B1-> F, and propeller pitch angle is always 0 ° in this process, but the obvious off-target state of wind energy utilization efficiency.
2, tracking wind energy process of the present invention: suppose that current wind speed is V1 (lower than rated wind speed), wind power generating set operates in the best power point A point that 1. curve is gone up, and now wheel speed is set to SArpm; If wind speed drops to V2 fast from V1 suddenly, wheel speed change is comparatively slow approximate constant, by blade pitch angle from 0 ° of rapid adjustment to 2 °, the A point that 1. wind power generating set running state is gone up by curve becomes the B point that 5. curve is gone up, and then 5. moves to C point according to maximal wind-power tracking strategy from B point along curve.Now blade pitch angle 4. moves to D point to 1 ° of same wind power generating set from C point along curve from 2 ° of rapid adjustment again.Now blade pitch angle 3. moves to E point to 0.5 ° of same wind power generating set from D point along curve from 1 ° of rapid adjustment again.Now blade pitch angle 2. moves to F point to 0 ° of same wind power generating set from E point along curve from 0.5 ° of rapid adjustment again.Its whole process is A-> B-> C-> D-> E-> F, propeller pitch angle change is from 0 ° of->, 2 ° of->, 1 ° of->, 0.5 ° of-> 0 °, and the tracking wind energy method of wind energy utilization efficiency obviously than conventional is high.
3, control flow and structural drawing:
Fig. 6 is the change oar control flow chart after adding the inventive method, and wherein, real-time wind speed is V; Wind speed after lower pass-filter is V
f; The change difference of current time wind speed is E
v=V
f(k)-V
f(k-1); The propeller pitch angle β that general change oar controller exports
0; Gain parameter is K; Final propeller pitch angle exports as β.
The first step: detect real-time wind speed V, can obtain V by filtering higher harmonics after low-pass filter
f;
Second step: the wind speed asking for current time and a upper moment changes difference E
v;
3rd step: judge the output propeller pitch angle β becoming oar controller
0whether be zero, if β
0non-vanishing, represent that wind power generating set enters rotational speed regulation or power throttling states, now then make the propeller pitch angle of pitch-controlled system export β=β
0, otherwise make the propeller pitch angle of pitch-controlled system export β=KE
v, now need KE
vvalue carry out amplitude limiting processing.
4, simulating, verifying
Fig. 7 is the Cp of wind speed the present invention and conventional tracking wind energy when rising suddenly, power and propeller pitch angle simulation curve contrast schematic diagram, as can be seen from Figure 7, when wind speed rises suddenly, technological scheme Cp that the present invention carries and power obviously exceed conventional scheme about 0.5%-1.48% in Dynamic Regulating Process and propeller pitch angle excursion is-0.6 ° ~ 0 °.
Fig. 8 is the Cp of wind speed the present invention and conventional tracking wind energy when declining suddenly, power and propeller pitch angle simulation curve contrast schematic diagram, as can be seen from Figure 8, when wind speed declines suddenly, technological scheme Cp that the present invention carries and power obviously exceed conventional scheme about 0.4%-2.38% in Dynamic Regulating Process and propeller pitch angle excursion is 0.6 ° ~ 0 °.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (10)
1. improve a method for wind power generating set wind energy utilization efficiency, it is characterized in that, described method comprises the steps:
Obtained wind speed and the wind speed in a upper moment of current time;
According to wind speed and the wind speed in a described upper moment of described current time, asked for the wind speed of described current time and the change difference of the wind speed in a described upper moment;
Obtain the output propeller pitch angle becoming oar controller, judge whether described output propeller pitch angle is zero;
If described output propeller pitch angle is zero, then according to described change difference, setting is carried out to described output propeller pitch angle and regulate.
2. a kind of method improving wind power generating set wind energy utilization efficiency according to claim 1, is characterized in that,
The wind speed of described current time and the wind speed in a described upper moment are the wind speed by obtaining after low-pass filter filtering higher harmonics.
3. a kind of method improving wind power generating set wind energy utilization efficiency according to claim 1, is characterized in that, if described output propeller pitch angle is zero, then carries out setting according to described change difference to described output propeller pitch angle and regulates, be specially:
If the output propeller pitch angle of described change oar controller is zero, then according to the wind speed of current time and the change difference of the wind speed in a upper moment and the product of gain parameter, described output propeller pitch angle was adjusted to setting value.
4. a kind of method improving wind power generating set wind energy utilization efficiency according to claim 3, is characterized in that, the span of described gain parameter is in the scope of-0.1 ~ 0.
5. a kind of method improving wind power generating set wind energy utilization efficiency according to claim 3, it is characterized in that, described method also comprises the adjustment thresholding of default described output propeller pitch angle, when the absolute value of described setting value is greater than described adjustment doors in limited time, carries out amplitude limit to described setting value.
6. improve a device for wind power generating set wind energy utilization efficiency, it is characterized in that, described device comprises:
Acquisition module, for obtaining wind speed and the wind speed in a upper moment of current time;
Computing module, for according to the wind speed of described current time and the wind speed in a described upper moment, asked for the wind speed of described current time and the change difference of the wind speed in a described upper moment;
Described acquisition module, also for obtaining the output propeller pitch angle becoming oar controller;
Judge module, for judging whether described output propeller pitch angle is zero;
Adjustment module, if be zero for described output propeller pitch angle, then carry out setting according to described change difference to described output propeller pitch angle and regulates.
7. a kind of device improving wind power generating set wind energy utilization efficiency according to claim 6, is characterized in that,
The wind speed of described current time and the wind speed in a described upper moment are the wind speed by obtaining after low-pass filter filtering higher harmonics.
8. a kind of device improving wind power generating set wind energy utilization efficiency according to claim 6, is characterized in that,
Described adjustment module, if be zero specifically for the output propeller pitch angle of described change oar controller, was then adjusted to setting value according to the wind speed of current time and the change difference of the wind speed in a upper moment and the product of gain parameter by described output propeller pitch angle.
9. a kind of method improving wind power generating set wind energy utilization efficiency according to claim 8, is characterized in that, the span of described gain parameter is in the scope of-0.1 ~ 0.
10. a kind of method improving wind power generating set wind energy utilization efficiency according to claim 8, it is characterized in that, described device is bag clipping module also, for presetting the adjustment thresholding of described output propeller pitch angle, when the absolute value of described setting value is greater than described adjustment doors in limited time, amplitude limit is carried out to described setting value.
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| CN107514336A (en) * | 2016-06-16 | 2017-12-26 | 北京金风科创风电设备有限公司 | Wind speed information processing method and device and variable pitch control method, device and system |
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| CN107514336A (en) * | 2016-06-16 | 2017-12-26 | 北京金风科创风电设备有限公司 | Wind speed information processing method and device and variable pitch control method, device and system |
| CN107514336B (en) * | 2016-06-16 | 2019-01-01 | 北京金风科创风电设备有限公司 | wind speed information processing method and device and variable pitch control method, device and system |
| CN108223266A (en) * | 2016-12-13 | 2018-06-29 | 北京金风科创风电设备有限公司 | Method and device for controlling wind power generator below rated wind speed |
| CN109162870A (en) * | 2018-08-31 | 2019-01-08 | 北京金风科创风电设备有限公司 | Method, device and equipment for controlling blade adjustment of wind generating set and storage medium |
| CN109882355A (en) * | 2019-03-28 | 2019-06-14 | 李英堂 | The dynamic matching method and system of low wind speed apparatus for lower wind generating efficiency in a kind of promotion |
| CN109882355B (en) * | 2019-03-28 | 2020-04-07 | 李英堂 | Dynamic matching method and system for improving wind power generation efficiency at medium and low wind speeds |
| CN112523939A (en) * | 2019-09-17 | 2021-03-19 | 北京金风科创风电设备有限公司 | Pitch control method, device and system and computer readable storage medium |
| CN112523939B (en) * | 2019-09-17 | 2022-07-19 | 北京金风科创风电设备有限公司 | Pitch control method, device and system and computer readable storage medium |
| CN110597207A (en) * | 2019-09-18 | 2019-12-20 | 中冶赛迪重庆信息技术有限公司 | Coking operation action amount identification method and system and computer readable storage medium |
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