CN103345261A - Heliostat reflecting facula offset correction method - Google Patents
Heliostat reflecting facula offset correction method Download PDFInfo
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- CN103345261A CN103345261A CN2013102415885A CN201310241588A CN103345261A CN 103345261 A CN103345261 A CN 103345261A CN 2013102415885 A CN2013102415885 A CN 2013102415885A CN 201310241588 A CN201310241588 A CN 201310241588A CN 103345261 A CN103345261 A CN 103345261A
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Abstract
The invention discloses a heliostat reflecting facula offset correction method and belongs to the technical field of solar tower type thermal generating. According to the heliostat reflecting facula offset correction method, a heliostat reflecting facula offset correction device and a heliostat tracking offset database of the heliostat reflecting facula offset correction device are used for carrying out heliostat reflecting facula offset correction. The azimuth angle and the angle of pitch of a heliostat are adjusted and corrected by means of data on the ideal azimuth angle, the ideal angle of pitch, azimuth angle correction and angle of pitch correction of the heliostat in a heliostat tracking offset database based on relevant characteristics of tracking offset of the heliostat and the angle of pitch and the azimuth angle of the heliostat so as to achieve heliostat reflecting facula offset correction. The correction device and the heliostat tracking offset database of the correction device are low in cost and capable of resisting interference by ambient light and procedures of correcting heliostat reflecting facula offset are simple. The requirement for industrial on-spot application can be met. The heliostat reflecting facula offset correction method is suitable for heliostat reflecting facula offset correction of a heliostat tracking system of a tower type solar thermal generating station.
Description
Technical field
The invention belongs to the solar energy tower type thermal generation technical field, particularly a kind of heliostat flare offset correction method.
Background technology
The heliostat field is the important component part of tower type solar energy thermal power generation station electricity generation system, and numerous heliostats gather the sunshine reflection on the heat collector that receives top of tower, heating working medium, and the steam that produces high temperature, high pressure generates electricity.The solar tracking precision of heliostat is the important subject in tower type solar energy thermal power generation field.Can calculate the current angle of pitch that should locate of heliostat and position angle accurately by astronomical formula, yet inevitably there are various errors in manufacturing, the installation and operation process, as because factors such as settlement of foundation, big wind load, gravity deformations, heliostat meeting run-off the straight, cause reflected sunlight to depart from objectives, sunshine can accurately not reflexed on the heat collector.Up to the present, the method for raising heliostat tracking accuracy has a variety of.
Chinese patent 200810025001.6 " a kind of heliostat follow-up control apparatus and control method thereof " adopts open loop and closed loop way of combining, and each heliostat is joined a four-quadrant sun position sensor and proofreaied and correct tracking error.But this method require four-quadrant sun position sensor need with heliostat, heat collector sight alignment, the installation vertical rod of four-quadrant sun position sensor is subjected to factors such as settlement of foundation, big wind load to have skewness equally in actual engineering, and the requirement of above-mentioned " sight alignment " is difficult to guarantee.
Allow heliostat elder generation shine to the target blank on the tower in the Chinese patent 200910244113.5 " a kind of heliostat tracking error correction method ", and with the CCD camera to the hot spot imaging, identify the position deviation of spot center and target's center, and then the heliostat tracker is carried out deviation compensation.This method is a kind of indirect method, the supposition that is directly proportional with irradiation intensity based on the gradation of image value, yet, expose to the weather and the sand and dust wearing and tearing owing to bear for a long time under the target blank lowered in field environment, its surperficial reflecting properties can be inhomogeneous gradually, the gray-scale value of image and the relation of suffered irradiation intensity of taking pictures can not keep constant, so the calculating confidence level of the mass centre of heliostat projected spot is weakened.Therefore use in order to satisfy industry spot, need a kind of heliostat means for correcting and bearing calibration of cheaply, can anti-environment light source disturbing.
Summary of the invention
The objective of the invention is for the price height that solves the described existing heliostat alignment technique of background technology, be subject to disturb shortcoming, propose a kind of heliostat flare driven parallax correction setter and method thereof, its technical scheme is:
Heliostat flare driven parallax correction setter comprises the thermal-arrest tower 2 at tower type solar energy thermal power generation station, heliostat field and heliostat control system and photosensitive array 3 and photosensitive array detection system, the heliostat of heliostat 1 for being corrected in the heliostat field, heat collector places thermal-arrest tower 2 tops, photosensitive array 3 is below the heat collector heating surface 4 and together towards being installed on the thermal-arrest tower 2, the vertical center line of photosensitive array 3 and the vertical central lines of heat collector heating surface 4, the light-sensitive surface of photosensitive array 3 is square, to be incident sunlight 5 be reflected in 0.5～5 times of flare diameter on the photosensitive array 3 through heliostat 1 to the spacing of photosensitive array 3 and heat collector heating surface 4, the length of side of photosensitive array 3 is 1～5 times of described flare diameter, photosensitive array 3 is made up of M * M photo-sensitive cell 301, M is 10～100 positive integer, and the true origin of the detection faces of photosensitive array 3 is photosensitive array center 6;
The photo-sensitive cell 301 of photosensitive array 3 detects incident sunlight 5 and handles by the photosensitive array detection system through the flare that heliostat 1 is reflected on the photosensitive array 3, measure flare center 7 with respect to the position of described true origin, the photosensitive array detection system passes to the heliostat control system with the data of the position at flare center 7, by the position deviation of heliostat control system according to flare center 7 and photosensitive array center 6, adjust position angle and the angle of pitch of heliostat 1, flare center 7 and photosensitive array center 6 are overlapped, realize the offset correction of heliostat flare; Described photo-sensitive cell 301 is phototriode, photoelectric cell or photoresistance;
The heliostat tracing deviation data of database of heliostat flare driven parallax correction setter comprises: when heliostat serves as the irradiation target with heat collector heating surface center, and the desirable orientation angle of heliostat, the desirable angle of pitch, azimuth correction and angle of pitch correction; When heliostat serves as the irradiation target with the photosensitive array center, the desirable orientation angle of heliostat, the desirable angle of pitch, azimuth correction and angle of pitch correction;
The step of utilizing described heliostat flare driven parallax correction setter and heliostat tracing deviation database thereof to carry out heliostat flare offset correction method is:
Step 1, beginning:
Start heliostat control system, photosensitive array detection system and heliostat tracing deviation database, the heliostat 1 that will be corrected in the selected heliostat field;
Step 2, photosensitive array 3 detection background irradiation intensities:
Output signal strength by each photo-sensitive cell 301 in the detection of photosensitive array detection system and the record photosensitive array 3 is the background irradiation intensity;
Step 3, the flare of heliostat 1 is transferred on the photosensitive array 3 from heat collector heating surface 4:
The heliostat of transferring heliostat 1 from heliostat tracing deviation database is desirable orientation angle and the desirable angle of pitch of the heliostat when shining target with the photosensitive array center, the desirable orientation angle of the heliostat when serving as irradiation target by the heliostat of heliostat 1 with the photosensitive array center by the heliostat control system and the data of the desirable angle of pitch are adjusted position angle and the angle of pitch of heliostat 1, and the flare of heliostat 1 is transferred on the photosensitive array 3 from heat collector heating surface 4;
Step 4, photosensitive array 3 detect the flare of heliostat 1:
Detect and record the output signal strength of each photo-sensitive cell 301 by the photosensitive array detection system, again with step 2 in the background irradiation intensity of each photo-sensitive cell 301 of recording compare, the photo-sensitive cell 301 that signal intensity raises is for being subjected to the photo-sensitive cell of heliostat 1 flare irradiation, photosensitive array detection system statistics is subjected to coordinate and the signal intensity lift-off value of the photo-sensitive cell 301 of heliostat 1 flare irradiation, calculates the coordinate position at the flare center 7 that shines on the photosensitive array 3;
Position angle and the angle of pitch of step 5, correction heliostat 1:
The heliostat that checks in heliostat 1 from heliostat tracing deviation database serves as azimuth correction and the angle of pitch correction of the heliostat when shining target with the photosensitive array center, and position angle and the angle of pitch of heliostat 1 are revised;
Step 6, calculating shine the flare center 7 and the remaining deviation in the position at photosensitive array center 6 on the photosensitive array 3:
A: flare center 7 is zero with the remaining deviation in the position at photosensitive array center 6, the flare of heliostat 1 full illumination to photosensitive array 3, and flare center 7 and photosensitive array center 6 overlap, and the trimming process of flare on photosensitive array 3 finishes, and enters step 7;
Azimuth correction and the angle of pitch correction of the heliostat the when heliostat of the heliostat 1 that upgrades the desirable orientation angle of the heliostat the when heliostat of transferring heliostat 1 from heliostat tracing deviation database serves as the irradiation target with heat collector heating surface center and the desirable angle of pitch and the step 6 serves as the irradiation target with heat collector heating surface center, the flare of heliostat 1 is transferred on the heat collector heating surface 4 from photosensitive array 3, flare center 7 overlaps with the center of heat collector heating surface 4, finishes the heliostat flare offset correction of heliostat 1.
Principle of the present invention is, described heliostat flare offset correction method is based on the tracing deviation of the heliostat characteristic relevant with the position angle with the angle of pitch of heliostat, difference among 1 year is set up the heliostat tracing deviation database of heliostat flare driven parallax correction setter constantly; Desirable orientation angle and the desirable angle of pitch of the heliostat when serving as the irradiation target according to the heliostat in the heliostat tracing deviation database with the photosensitive array center, position angle and the angle of pitch of adjusting heliostat make heliostat to the photosensitive array reflected sunlight; The photo-sensitive cell output signal value that is subjected to the irradiation of reflected sunlight spot increases, and by reading the output signal of photo-sensitive cell, detects the center of heliostat flare; The heliostat that provides according to heliostat tracing deviation database is azimuth correction and the angle of pitch correction of the heliostat when shining target with the photosensitive array center, revise the angle of pitch and the position angle of heliostat, calculate the flare center that shines on the photosensitive array and the remaining deviation in position at photosensitive array center; Azimuth correction and the angle of pitch correction of the heliostat the when azimuth correction of the heliostat when upgrading heliostat and serve as the irradiation target with the photosensitive array center according to the amount of the remaining deviation in position and angle of pitch correction and heliostat serve as the irradiation target with heat collector heating surface center, again revise the angle of pitch and the position angle of heliostat, until eliminating remaining deviation; Desirable orientation angle and the desirable angle of pitch of the heliostat when re-using heliostat that heliostat tracing deviation database provides and serving as the irradiation target with heat collector heating surface center and upgrade after angle of pitch correction and the azimuth correction of heliostat the reflected sunlight spot is transferred to the heat collector heating surface, the flare center is overlapped with heat collector heating surface center, finish the offset correction of heliostat flare.
In order to realize the correction of tracing deviation data, at first set up heliostat tracing deviation database, its process is as follows:
Utilize astronomical formula, relative position according to longitude and latitude, date and the moment and each heliostat and heat collector heating surface center, calculate heliostat desirable orientation angle and the desirable angle of pitch when difference moment heliostat serves as the irradiation target with the photosensitive array center, the initial value of azimuth correction and angle of pitch correction is made as zero;
Be initial point with photosensitive array center 6, set up coordinate system, X-axis is horizontal direction, and Y-axis is vertical direction.If in heliostat flare offset correction process, flare center 7 is non-vanishing with the remaining deviation in the position at photosensitive array center 6, as shown in Figure 2.Azimuth correction and the angle of pitch correction when heliostat is served as the irradiation target with the photosensitive array center are upgraded, and the rule of renewal is as follows:
U
1=U
0﹣atan(G/L)
V
1=V
0﹣atan(H/L)
Wherein, U
1Be the azimuth correction after upgrading, U
0Be the azimuth correction before not upgrading, G is the horizontal ordinate of heliostat flare center on photosensitive array, V
1Be the angle of pitch correction after upgrading, V
0Be the angle of pitch correction before not upgrading, H is the ordinate of heliostat flare center on photosensitive array, and L is the distance at heliostat 1 and photosensitive array center 6.
Utilize astronomical formula, relative position according to longitude and latitude, date and the moment and each heliostat and photosensitive array center, calculate heliostat desirable orientation angle and the desirable angle of pitch when difference moment heliostat serves as the irradiation target with heat collector heating surface center, the initial value of azimuth correction and angle of pitch correction is made as zero;
Because of the spacing of photosensitive array 3 and heat collector heating surface 4 much smaller than the distance L of heliostat 1 with photosensitive array center 6, therefore, if in heliostat flare offset correction process, when flare center 7 is non-vanishing with the remaining deviation in the position at photosensitive array center 6, the more new data U of the azimuth correction of the heliostat when adopting above-mentioned heliostat to serve as the irradiation target with the photosensitive array center respectively
1More new data V with angle of pitch correction
1The azimuth correction of the heliostat when serving as the irradiation target as heliostat with heat collector heating surface center respectively and the more new data of angle of pitch correction.
Heliostat tracing deviation database is stored following data:
When heliostat serves as the irradiation target with heat collector heating surface center, the desirable orientation angle of heliostat, desirable orientation angle, azimuth correction and angle of pitch correction;
When heliostat serves as the irradiation target with the photosensitive array center, the desirable orientation angle of heliostat, desirable orientation angle, azimuth correction and angle of pitch correction;
Beneficial effect of the present invention is, there are proportional relation in output signal strength and the suffered irradiation intensity of the photo-sensitive cell that the present invention adopts, and linearity height is distinguished environment irradiation and heliostat reflected light irradiation easily, and the anti-environmental interference ability of photosensitive array is strong; The heliostat flare driven parallax correction setter that the present invention adopts and heliostat tracing deviation database thereof are a kind of equipment that cheaply, can anti-environment light source disturbs, the step of carrying out the offset correction of heliostat flare is simple, can satisfy tower type solar energy thermal power generation station industry spot and use.
Description of drawings
Fig. 1 is the used heliostat flare of the present invention driven parallax correction setter light path synoptic diagram;
Fig. 2 is heliostat flare offset correction process synoptic diagram;
Fig. 3 is heliostat flare offset correction method flow diagram.
Among the figure, 1--heliostat, 2--thermal-arrest tower, 3--photosensitive array, 4--heat collector heating surface, 5--sunlight, 301--photo-sensitive cell, 6--photosensitive array center, 7--flare center.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and instantiation.
Heliostat flare driven parallax correction setter comprises thermal-arrest tower 2, heliostat field and heliostat control system and photosensitive array 3 and the photosensitive array detection system at tower type solar energy thermal power generation station.Fig. 1 is the used heliostat flare of the present invention driven parallax correction setter light path synoptic diagram, the heliostat of heliostat 1 for being corrected in the heliostat field, heat collector places thermal-arrest tower 2 tops, photosensitive array 3 is below the heat collector heating surface 4 and together towards being installed on the thermal-arrest tower 2, the vertical center line of photosensitive array 3 and the vertical central lines of heat collector heating surface 4, the light-sensitive surface of photosensitive array 3 is square, to be incident sunlight 5 be reflected in 1 times of flare diameter on the photosensitive array 3 through heliostat 1 to the spacing of photosensitive array 3 and heat collector heating surface 4, and the length of side of photosensitive array 3 is 3 times of described flare diameter.Photosensitive array 3 is made up of 100 * 100 photo-sensitive cells 301, and the true origin of the detection faces of photosensitive array 3 is photosensitive array center 6.The photo-sensitive cell 301 of photosensitive array 3 detects incident sunlight 5 and handles by the photosensitive array detection system through the flare that heliostat 1 is reflected on the photosensitive array 3, measures flare center 7 with respect to the position of described true origin, as shown in Figure 2.The photosensitive array detection system passes to the heliostat control system with the data of the position at flare center 7, by the position deviation of heliostat control system according to flare center 7 and photosensitive array center 6, adjust position angle and the angle of pitch of heliostat 1, flare center 7 and photosensitive array center 6 are overlapped, realize the offset correction of heliostat flare.Photo-sensitive cell 301 is phototriode.
Utilize the heliostat tracing deviation data of database of the device foundation of present embodiment to comprise: when heliostat serves as the irradiation target with heat collector heating surface center, the desirable orientation angle of heliostat, desirable orientation angle, azimuth correction and angle of pitch correction; When heliostat serves as the irradiation target with the photosensitive array center, the desirable orientation angle of heliostat, desirable orientation angle, azimuth correction and angle of pitch correction.
Fig. 3 is heliostat flare offset correction method flow diagram, and correcting process is as follows:
The present invention is applicable to the heliostat flare offset correction of tower type solar energy thermal power generation station heliostat tracker.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement 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 claim.
Claims (2)
1. heliostat flare offset correction method, used heliostat flare driven parallax correction setter comprises the thermal-arrest tower (2) at tower type solar energy thermal power generation station, heliostat field and heliostat control system and photosensitive array (3) and photosensitive array detection system, the heliostat of heliostat (1) for being corrected in the heliostat field, heat collector places thermal-arrest tower (2) top, photosensitive array (3) is in the below of heat collector heating surface (4) and together towards being installed on the thermal-arrest tower (2), the vertical central lines of the vertical center line of photosensitive array (3) and heat collector heating surface (4), the light-sensitive surface of photosensitive array (3) is square, to be incident sunlight (5) be reflected in 0.5～5 times of flare diameter on the photosensitive array (3) through heliostat (1) to the spacing of photosensitive array (3) and heat collector heating surface (4), the length of side of photosensitive array (3) is 1～5 times of described flare diameter, photosensitive array (3) is made up of M * M photo-sensitive cell (301), M is 10～100 positive integer, and the true origin of the detection faces of photosensitive array (3) is photosensitive array center (6);
The heliostat tracing deviation data of database of used heliostat flare driven parallax correction setter comprises: when heliostat serves as the irradiation target with heat collector heating surface center, and the desirable orientation angle of heliostat, the desirable angle of pitch, azimuth correction and angle of pitch correction; When heliostat serves as the irradiation target with the photosensitive array center, the desirable orientation angle of heliostat, the desirable angle of pitch, azimuth correction and angle of pitch correction; It is characterized in that the step of utilizing described heliostat flare driven parallax correction setter and heliostat tracing deviation database thereof to carry out heliostat flare offset correction method is:
Step 1, beginning:
Start heliostat control system, photosensitive array detection system and heliostat tracing deviation database, the heliostat (1) that will be corrected in the selected heliostat field;
Step 2, photosensitive array (3) detection background irradiation intensity:
Output signal strength by each photo-sensitive cell (301) in the photosensitive array detection system record photosensitive array (3) is the background irradiation intensity;
Step 3, the flare of heliostat (1) is transferred on the photosensitive array (3) from heat collector heating surface (4):
The heliostat of transferring heliostat (1) from heliostat tracing deviation database is desirable orientation angle and the desirable angle of pitch of the heliostat when shining target with the photosensitive array center, the desirable orientation angle of the heliostat when serving as irradiation target by the heliostat of heliostat (1) with the photosensitive array center by the heliostat control system and the data of the desirable angle of pitch are adjusted position angle and the angle of pitch of heliostats (1), and the flare of heliostat (1) is transferred on the photosensitive array (3) from heat collector heating surface (4);
Step 4, photosensitive array (3) detect the flare of heliostat (1):
Detect and record the output signal strength of each photo-sensitive cell (301) by the photosensitive array detection system, again with step 2 in the background irradiation intensity of each photo-sensitive cell (301) of recording compare, the photo-sensitive cell (301) that signal intensity raises is for being subjected to the photo-sensitive cell of heliostat (1) flare irradiation, photosensitive array detection system statistics is subjected to coordinate and the signal intensity lift-off value of the photo-sensitive cell (301) of heliostat (1) flare irradiation, calculates the coordinate position at the flare center (7) that shines on the photosensitive array (3);
Position angle and the angle of pitch of step 5, correction heliostat (1):
The heliostat that checks in heliostat (1) from heliostat tracing deviation database serves as azimuth correction and the angle of pitch correction of the heliostat when shining target with the photosensitive array center, and position angle and the angle of pitch of heliostat (1) are revised;
Step 6, calculate the flare center (7) shine on the photosensitive array (3) and the position remnants deviation of photosensitive array center (6):
A: flare center (7) are zero with the remaining deviation in the position at photosensitive array center (6), the flare of heliostat (1) full illumination to photosensitive array (3), and flare center (7) and photosensitive array center (6) overlap, the trimming process of flare on photosensitive array (3) finishes, and enters step 7;
B. flare center (7) are non-vanishing with the remaining deviation in the position at photosensitive array center (6), the heliostat that upgrades heliostat (1) in the heliostat tracing deviation database according to the amount of the remaining deviation in position is azimuth correction data and the angle of pitch correction data of the heliostat when shining target with the photosensitive array center, the heliostat that upgrades heliostat (1) simultaneously is azimuth correction data and the angle of pitch correction data of the heliostat when shining target with heat collector heating surface center, repeating step five and step 6 are until the remaining deviation in the position of eliminating flare center (7) and photosensitive array center (6);
Step 7, recovery heliostat (1) flare irradiation heat collector heating surface (4):
Azimuth correction and the angle of pitch correction of the heliostat the when heliostat of the heliostat (1) that upgrades the desirable orientation angle of the heliostat the when heliostat of transferring heliostat (1) from heliostat tracing deviation database serves as the irradiation target with heat collector heating surface center and the desirable angle of pitch and the step 6 serves as the irradiation target with heat collector heating surface center, the flare of heliostat (1) is transferred on the heat collector heating surface (4) from photosensitive array (3), flare center (7) overlaps with the center of heat collector heating surface (4), finishes the heliostat flare offset correction of heliostat (1).
2. heliostat flare offset correction method according to claim 1 is characterized in that described photo-sensitive cell (301) is phototriode, photoelectric cell or photoresistance.
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| CN111459194A (en) * | 2020-04-10 | 2020-07-28 | 中国电力工程顾问集团西北电力设计院有限公司 | Solar thermal power generation aiming point determination method based on heliostat measured light spot |
| CN111459194B (en) * | 2020-04-10 | 2023-09-12 | 中国电力工程顾问集团西北电力设计院有限公司 | Solar thermal power generation aiming point determining method based on heliostat actually measured light spots |
| CN112611368A (en) * | 2020-12-01 | 2021-04-06 | 西南交通大学 | Automatic aligning beacon device of ground precision detector |
| CN112611368B (en) * | 2020-12-01 | 2022-08-05 | 西南交通大学 | Automatic aligning beacon device of ground precision detector |
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