CN103345261B - Heliostat flare deviation correction method - Google Patents
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- CN103345261B CN103345261B CN201310241588.5A CN201310241588A CN103345261B CN 103345261 B CN103345261 B CN 103345261B CN 201310241588 A CN201310241588 A CN 201310241588A CN 103345261 B CN103345261 B CN 103345261B
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Abstract
The invention discloses a kind of heliostat flare deviation correction method, belong to solar energy tower type thermal generation technical field.The present invention utilizes heliostat flare driven parallax correction setter and heliostat tracing deviation database thereof to carry out the offset correction of heliostat flare, the present invention is based on the characteristic that the tracing deviation of heliostat is relevant with position angle to the angle of pitch of heliostat, by the desirable orientation angle of heliostat in heliostat tracing deviation database, desirable orientation angle, azimuth correction and angle of pitch correction data, the position angle of adjustment and correction heliostat and the angle of pitch, realize the offset correction of heliostat flare.The present invention adopt means for correcting and heliostat tracing deviation database be a kind of low cost, can environment resistant light source interference equipment, the step of carrying out the offset correction of heliostat flare is simple, meet industry spot application, be applicable to tower type solar energy thermal power generation and stand firm the heliostat flare offset correction of solar eyepiece tracker.
Description
Technical field
The invention belongs to solar energy tower type thermal generation technical field, particularly a kind of heliostat flare deviation correction method.
Background technology
Heliostat field is the important component part of tower type solar energy thermal power generation station electricity generation system, and sunshine reflection gathers on the heat collector of reception top of tower by numerous heliostat, heating working medium, and the steam of generation 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.The current angle of pitch that should locate of heliostat and position angle can be calculated accurately by astronomical formula, but manufacture, inevitably there is various error in installation and operation process, as due to factors such as settlement of foundation, wind loads, gravity deformations, heliostat meeting run-off the straight, cause reflected sunlight to depart from target, sunshine can accurately not reflexed on heat collector.Up to the present, the method improving heliostat tracking accuracy has a variety of.
Chinese patent 200810025001.6 " a kind of heliostat tracing control device and control method thereof ", adopt the way that Open loop and closed loop combines, each heliostat joins a four-quadrant sun position sensor to correct tracking error.But the method requires that four-quadrant sun position sensor needs and heliostat, heat collector sight alignment, there is skewness by the factor such as settlement of foundation, wind loads equally in the installation vertical rod of four-quadrant sun position sensor in Practical Project, and the requirement of above-mentioned " sight alignment " is difficult to ensure.
Heliostat is allowed first to irradiate to the target blank on tower in Chinese patent 200910244113.5 " a kind of heliostat tracking error correction method ", and by CCD camera to hot spot imaging, identify the position deviation of spot center and target's center, and then deviation compensation is carried out to heliostat tracker.The method is a kind of indirect method, based on the supposition that image intensity value is directly proportional to irradiation intensity, but, expose to the weather and sand and dust wearing and tearing owing to bearing for a long time under target blank lowered in field environment, the reflecting properties on its surface can be uneven gradually, the gray-scale value of image and the relation of suffered irradiation intensity of taking pictures can not keep constant, so weakened the calculating confidence level of the mass centre of heliostat projected spot.Therefore in order to meet industry spot application, need a kind of low cost, can environment resistant light source interference heliostat means for correcting and bearing calibration.
Summary of the invention
The object of the invention is price in order to solve existing heliostat alignment technique described in background technology high, be easily disturbed 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 control system of heliostat and photosensitive array 3 and photosensitive array detection system, heliostat 1 is the heliostat be corrected in heliostat field, heat collector is placed in thermal-arrest tower 2 top, photosensitive array 3 is in the below of heat collector heating surface 4 and together towards being arranged on thermal-arrest tower 2, the vertical center line of photosensitive array 3 and the vertical center line of heat collector heating surface 4 overlap, the light-sensitive surface of photosensitive array 3 is square, photosensitive array 3 is that incident sunlight 5 is reflected in 0.5 ~ 5 times of the flare diameter on photosensitive array 3 through heliostat 1 with the spacing of 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 the positive integer of 10 ~ 100, 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 that incident sunlight 5 is reflected in after the flare on photosensitive array 3 through the process of photosensitive array detection system through heliostat 1, measure the position of flare center 7 relative to described true origin, the data of the position at flare center 7 are passed to control system of heliostat by photosensitive array detection system, by control system of heliostat according to the position deviation of flare center 7 with photosensitive array center 6, the position angle of adjustment heliostat 1 and the angle of pitch, 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 data of the heliostat tracing deviation database of heliostat flare driven parallax correction setter comprise: heliostat with heat collector heating surface center for irradiate target time, the desirable orientation angle of heliostat, the desirable angle of pitch, azimuth correction and angle of pitch correction; Heliostat with photosensitive array center for irradiate target time, the desirable orientation angle of heliostat, the desirable angle of pitch, azimuth correction and angle of pitch correction;
The step utilizing described heliostat flare driven parallax correction setter and heliostat tracing deviation database thereof to carry out heliostat flare deviation correction method is:
Step one, beginning:
Start control system of heliostat, photosensitive array detection system and heliostat tracing deviation database, the heliostat 1 that will be corrected in selected heliostat field;
Step 2, photosensitive array 3 detection background irradiation intensity:
Detected and recorded the output signal strength of each photo-sensitive cell 301 in photosensitive array 3 by photosensitive array detection system, be background irradiation intensity;
Step 3, the flare of heliostat 1 is transferred to photosensitive array 3 from heat collector heating surface 4:
The heliostat transferring heliostat 1 from heliostat tracing deviation database is the desirable orientation angle of heliostat when irradiating target and the desirable angle of pitch with photosensitive array center, the heliostat being pressed heliostat 1 by control system of heliostat with photosensitive array center for irradiating target time the desirable orientation angle of heliostat and the position angle of the data point reuse heliostat 1 of the desirable angle of pitch and the angle of pitch, the flare of heliostat 1 is transferred to photosensitive array 3 from heat collector heating surface 4;
Step 4, photosensitive array 3 detect the flare of heliostat 1:
The output signal strength of each photo-sensitive cell 301 is detected and is recorded by photosensitive array detection system, compare with the background irradiation intensity of each photo-sensitive cell 301 that records in step 2 again, the photo-sensitive cell that the photo-sensitive cell 301 that signal intensity raises irradiates for being subject to heliostat 1 flare, photosensitive array detection system statistics is subject to coordinate and the signal intensity lift-off value of the photo-sensitive cell 301 that heliostat 1 flare irradiates, and calculates the coordinate position at the flare center 7 be irradiated on photosensitive array 3;
Step 5, the position angle revising heliostat 1 and the angle of pitch:
The heliostat checking in heliostat 1 from heliostat tracing deviation database is azimuth correction and the angle of pitch correction of heliostat when irradiating target with photosensitive array center, revises the position angle of heliostat 1 and the angle of pitch;
Step 6, calculate the position residual deviation at the flare center on photosensitive array 3 of being irradiated to 7 and photosensitive array center 6:
A: flare center 7 is zero with the position residual deviation 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 terminates, and enters step 7;
B. flare center 7 is non-vanishing with the position residual deviation at photosensitive array center 6, according to azimuth correction data and the angle of pitch correction data of the heliostat when heliostat of heliostat 1 is irradiation target with photosensitive array center in the amount renewal heliostat tracing deviation database of position residual deviation, the azimuth correction data of the heliostat when heliostat of renewal heliostat 1 is irradiation target with heat collector heating surface center simultaneously and angle of pitch correction data, repeat step 5 and step 6, until eliminate the position residual deviation at flare center 7 and photosensitive array center 6,
Step 7, recovery heliostat 1 flare irradiate heat collector heating surface 4:
Azimuth correction and the angle of pitch correction of the heliostat transferring heliostat 1 from heliostat tracing deviation database to take heat collector heating surface center as the heliostat of the heliostat 1 upgraded the desirable orientation angle of heliostat when irradiating target and the desirable angle of pitch and step 6 with heat collector heating surface center be heliostat when irradiating target, the flare of heliostat 1 is transferred to heat collector heating surface 4 from photosensitive array 3, flare center 7 and the center superposition of heat collector heating surface 4, complete the heliostat flare offset correction of heliostat 1.
Principle of the present invention is, described heliostat flare deviation correction method is based on the tracing deviation of heliostat and the angle of pitch of the heliostat characteristic relevant with position angle, among 1 year not in the same time, set up the heliostat tracing deviation database of heliostat flare driven parallax correction setter; The desirable orientation angle of heliostat when being irradiation target according to the heliostat in heliostat tracing deviation database with photosensitive array center and the desirable angle of pitch, the position angle of adjustment heliostat and the angle of pitch, make heliostat to photosensitive array reflected sunlight; Being subject to the photo-sensitive cell output signal value increase that reflected sunlight spot irradiates, by reading the output signal of photo-sensitive cell, detecting the center of heliostat flare; The heliostat provided according to heliostat tracing deviation database is azimuth correction and the angle of pitch correction of heliostat when irradiating target with photosensitive array center, revise the angle of pitch and the position angle of heliostat, calculate the position residual deviation at flare center and the photosensitive array center be irradiated on photosensitive array; Heliostat is upgraded with azimuth correction and the angle of pitch correction of to be the azimuth correction of heliostat when irradiating target and angle of pitch correction and heliostat with heat collector heating surface center be at photosensitive array center heliostat when irradiating target according to the amount of position residual deviation, again the angle of pitch and the position angle of heliostat is revised, until eliminate residual deviation; Re-using heliostat that heliostat tracing deviation database provides with heat collector heating surface center is that reflected sunlight spot is transferred to heat collector heating surface by the desirable orientation angle of heliostat when irradiating target and the angle of pitch correction of the desirable angle of pitch and the heliostat after upgrading and azimuth correction, make flare center and heat collector heating surface center superposition, complete the offset correction of heliostat flare.
In order to realize tracing deviation Data correction, first set up heliostat tracing deviation database, its process is as follows:
Utilize astronomical formula, according to the relative position at longitude and latitude, date and moment and each heliostat and heat collector heating surface center, calculate not in the same time heliostat with photosensitive array center for irradiate target time heliostat desirable orientation angle and the desirable angle of pitch, the initial value of azimuth correction and angle of pitch correction is set to zero;
With photosensitive array center 6 for initial point, set up coordinate system, X-axis is horizontal direction, and Y-axis is vertical direction.If in heliostat flare bias correction process, flare center 7 is non-vanishing with the position residual deviation at photosensitive array center 6, as shown in Figure 2.To heliostat with photosensitive array center for irradiate target time azimuth correction and angle of pitch correction upgrade, the rule of renewal is as follows:
U
1=U
0﹣atan(G/L)
V
1=V
0﹣atan(H/L)
Wherein, U
1the 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
1the 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, according to the relative position at longitude and latitude, date and moment and each heliostat and photosensitive array center, calculate not in the same time heliostat with heat collector heating surface center for irradiate target time heliostat desirable orientation angle and the desirable angle of pitch, the initial value of azimuth correction and angle of pitch correction is set to zero;
Because the spacing of photosensitive array 3 and heat collector heating surface 4 is much smaller than the distance L of heliostat 1 with photosensitive array center 6, therefore, if in heliostat flare bias correction process, when flare center 7 is non-vanishing with the position residual deviation at photosensitive array center 6, adopt above-mentioned heliostat with the more new data U of photosensitive array center for the azimuth correction of heliostat during irradiation target respectively
1with the more new data V of angle of pitch correction
1respectively as heliostat with heat collector heating surface center for irradiate target time the azimuth correction of heliostat and the more new data of angle of pitch correction.
The following data of heliostat tracing deviation database purchase:
Heliostat with heat collector heating surface center for irradiating target time, the desirable orientation angle of heliostat, desirable orientation angle, azimuth correction and angle of pitch correction;
Heliostat with photosensitive array center for irradiating target time, the desirable orientation angle of heliostat, desirable orientation angle, azimuth correction and angle of pitch correction;
Beneficial effect of the present invention is, the output signal strength of the photo-sensitive cell that the present invention adopts and suffered irradiation intensity exist proportional relation, and the linearity is high, and easily distinguish ambient irradiation and heliostat reflected light irradiation, photosensitive array environment resistant interference performance is strong; The present invention adopt heliostat flare driven parallax correction setter and heliostat tracing deviation database be a kind of low cost, can environment resistant light source interference equipment, the step of carrying out the offset correction of heliostat flare is simple, can meet the industry spot application of tower type solar energy thermal power generation station.
Accompanying drawing explanation
Fig. 1 is the present invention's heliostat flare used driven parallax correction setter light path schematic diagram;
Fig. 2 is heliostat flare bias correction process schematic diagram;
Fig. 3 is heliostat flare deviation correction method process flow diagram.
In 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
Below in conjunction with accompanying drawing and instantiation, the invention will be further described.
Heliostat flare driven parallax correction setter comprises the thermal-arrest tower 2 at tower type solar energy thermal power generation station, heliostat field and control system of heliostat and photosensitive array 3 and photosensitive array detection system.Fig. 1 is the present invention's heliostat flare used driven parallax correction setter light path schematic diagram, heliostat 1 is the heliostat be corrected in heliostat field, heat collector is placed in thermal-arrest tower 2 top, photosensitive array 3 is in the below of heat collector heating surface 4 and together towards being arranged on thermal-arrest tower 2, the vertical center line of photosensitive array 3 and the vertical center line of heat collector heating surface 4 overlap, the light-sensitive surface of photosensitive array 3 is square, photosensitive array 3 is that incident sunlight 5 is reflected in 1 times of the flare diameter on photosensitive array 3 through heliostat 1 with the spacing of heat collector heating surface 4, 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 that incident sunlight 5 is reflected in through the process of photosensitive array detection system after the flare on photosensitive array 3 through heliostat 1, measures the position of flare center 7 relative to described true origin, as shown in Figure 2.The data of the position at flare center 7 are passed to control system of heliostat by photosensitive array detection system, by control system of heliostat according to the position deviation of flare center 7 with photosensitive array center 6, the position angle of adjustment heliostat 1 and the angle of pitch, flare center 7 and photosensitive array center 6 are overlapped, realizes the offset correction of heliostat flare.Photo-sensitive cell 301 is phototriode.
The data of the heliostat tracing deviation database utilizing the device of the present embodiment to set up comprise: heliostat with heat collector heating surface center for irradiating target time, the desirable orientation angle of heliostat, desirable orientation angle, azimuth correction and angle of pitch correction; Heliostat with photosensitive array center for irradiating target time, the desirable orientation angle of heliostat, desirable orientation angle, azimuth correction and angle of pitch correction.
Fig. 3 is heliostat flare deviation correction method process flow diagram, and correcting process is as follows:
Step 110, opens control system of heliostat, photosensitive array detection system and heliostat tracing deviation database, the heliostat 1 that will be corrected in selected heliostat field;
Step 120, photosensitive array detection system detects and records the output signal strength of each photo-sensitive cell 301, is background irradiation intensity;
Step 130, the heliostat transferring heliostat 1 from heliostat tracing deviation database is the desirable orientation angle of heliostat when irradiating target and the desirable angle of pitch with photosensitive array center, by control system of heliostat by the position angle of the data point reuse heliostat 1 of the heliostat 1 transferred and the angle of pitch, the flare of heliostat 1 is transferred to photosensitive array 3 from heat collector heating surface 4;
Step 140, photosensitive array detection system detects and records the output signal strength of each photo-sensitive cell 301, compare with the background irradiation intensity of each photo-sensitive cell 301 that records in step 120 again, the photo-sensitive cell that the photo-sensitive cell 301 that signal intensity raises irradiates for being subject to heliostat 1 flare, photosensitive array detection system statistics is subject to coordinate and the signal intensity lift-off value of the photo-sensitive cell 301 that heliostat 1 flare irradiates, and calculates the coordinate position at the flare center 7 be irradiated on photosensitive array 3;
Step 150, the heliostat checking in heliostat 1 from heliostat tracing deviation database is azimuth correction and the angle of pitch correction of heliostat when irradiating target with photosensitive array center, revises the position angle of heliostat 1 and the angle of pitch;
Step 160, calculates the position residual deviation at flare the center 7 and photosensitive array center 6 be irradiated on photosensitive array 3;
Step 170, judges whether position residual deviation is zero: position residual deviation is zero, and the trimming process of flare on photosensitive array 3 terminates, then proceed to step 190, recovers heliostat flare and irradiates heat collector heating surface 4; Position residual deviation is non-vanishing, then proceed to step 180;
Step 180, the heliostat upgrading heliostat 1 according to the amount of the flare center 7 of heliostat 1 and the position residual deviation at photosensitive array center 6 is azimuth correction data and the angle of pitch correction data of heliostat when irradiating target with photosensitive array center, the azimuth correction data of the heliostat when heliostat of renewal heliostat 1 is irradiation target with heat collector heating surface center simultaneously and angle of pitch correction data, proceed to step 140, repeat step 140, step 150, step 160 and step 170, until eliminate the position residual deviation at flare center 7 and photosensitive array center 6, proceed to step 190,
Step 190, azimuth correction and the angle of pitch correction of the heliostat transferring heliostat 1 from heliostat tracing deviation database to take heat collector heating surface center as the heliostat of the heliostat 1 upgraded the desirable orientation angle of heliostat when irradiating target and the desirable angle of pitch and step 180 with heat collector heating surface center be heliostat when irradiating target, the flare of heliostat 1 is transferred to heat collector heating surface 4 from photosensitive array 3, flare center 7 and the center superposition of heat collector heating surface 4, complete the heliostat flare offset correction of heliostat 1.
The present invention is applicable to tower type solar energy thermal power generation and stands firm the heliostat flare offset correction of solar eyepiece tracker.
The above; be only the present invention's preferably embodiment, 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; the change 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. a heliostat flare deviation correction method, heliostat flare driven parallax correction setter used comprises the thermal-arrest tower (2) at tower type solar energy thermal power generation station, heliostat field and control system of heliostat and photosensitive array (3) and photosensitive array detection system, heliostat (1) heliostat for being corrected in heliostat field, heat collector is placed in thermal-arrest tower (2) top, photosensitive array (3) is in the below of heat collector heating surface (4) and together towards being arranged on thermal-arrest tower (2), the vertical center line of photosensitive array (3) and the vertical center line of heat collector heating surface (4) overlap, the light-sensitive surface of photosensitive array (3) is square, photosensitive array (3) is that incident sunlight (5) is reflected in 0.5 ~ 5 times of the flare diameter on photosensitive array (3) through heliostat (1) with the spacing of 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 the positive integer of 10 ~ 100, the true origin of the detection faces of photosensitive array (3) is photosensitive array center (6),
The data of the heliostat tracing deviation database of heliostat flare driven parallax correction setter used comprise: heliostat with heat collector heating surface center for irradiate target time, the desirable orientation angle of heliostat, the desirable angle of pitch, azimuth correction and angle of pitch correction; Heliostat with photosensitive array center for irradiate target time, 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 utilizing described heliostat flare driven parallax correction setter and heliostat tracing deviation database thereof to carry out heliostat flare deviation correction method is:
Step one, beginning:
Start control system of heliostat, photosensitive array detection system and heliostat tracing deviation database, the heliostat (1) that will be corrected in selected heliostat field;
Step 2, photosensitive array (3) detection background irradiation intensity:
By the output signal strength of each photo-sensitive cell (301) in photosensitive array detection system record photosensitive array (3), be background irradiation intensity;
Step 3, the flare of heliostat (1) is transferred to photosensitive array (3) from heat collector heating surface (4):
The heliostat transferring heliostat (1) from heliostat tracing deviation database is the desirable orientation angle of heliostat when irradiating target and the desirable angle of pitch with photosensitive array center, the heliostat being pressed heliostat (1) by control system of heliostat with photosensitive array center for irradiating target time the desirable orientation angle of heliostat and the position angle of the data point reuse heliostat (1) of the desirable angle of pitch and the angle of pitch, the flare of heliostat (1) is transferred to photosensitive array (3) from heat collector heating surface (4);
Step 4, photosensitive array (3) detect the flare of heliostat (1):
The output signal strength of each photo-sensitive cell (301) is detected and is recorded by photosensitive array detection system, compare with the background irradiation intensity of each photo-sensitive cell (301) that records in step 2 again, the photo-sensitive cell that the photo-sensitive cell (301) that signal intensity raises irradiates for being subject to heliostat (1) flare, photosensitive array detection system statistics is subject to coordinate and the signal intensity lift-off value of the photo-sensitive cell (301) that heliostat (1) flare irradiates, and calculates the coordinate position at the flare center (7) be irradiated on photosensitive array (3);
Step 5, the position angle revising heliostat (1) and the angle of pitch:
The heliostat checking in heliostat (1) from heliostat tracing deviation database is azimuth correction and the angle of pitch correction of heliostat when irradiating target with photosensitive array center, revises the position angle of heliostat (1) and the angle of pitch;
Step 6, calculate the position residual deviation of the flare center (7) that is irradiated on photosensitive array (3) and photosensitive array center (6):
A: flare center (7) are zero with the position residual deviation 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) terminates, and enters step 7;
B. flare center (7) are non-vanishing with the position residual deviation at photosensitive array center (6), according to azimuth correction data and the angle of pitch correction data of the heliostat when heliostat of heliostat (1) is irradiation target with photosensitive array center in the amount renewal heliostat tracing deviation database of position residual deviation, the heliostat simultaneously upgrading heliostat (1) is azimuth correction data and the angle of pitch correction data of heliostat when irradiating target with heat collector heating surface center, repeat step 5 and step 6, until eliminate the position residual deviation at flare center (7) and photosensitive array center (6),
Step 7, recovery heliostat (1) flare irradiate heat collector heating surface (4):
Azimuth correction and the angle of pitch correction of the heliostat transferring heliostat (1) from heliostat tracing deviation database to take heat collector heating surface center as the heliostat of the heliostat (1) upgraded the desirable orientation angle of heliostat when irradiating target and the desirable angle of pitch and step 6 with heat collector heating surface center be heliostat when irradiating target, the flare of heliostat (1) is transferred to heat collector heating surface (4) from photosensitive array (3), the center superposition of flare center (7) and heat collector heating surface (4), complete the heliostat flare offset correction of heliostat (1).
2. heliostat flare deviation 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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| WO2019100636A1 (en) | 2017-11-27 | 2019-05-31 | 上海晶电新能源有限公司 | Sun-tracking correction system and method based on celestial body image |
| US10309691B1 (en) | 2017-11-27 | 2019-06-04 | Shanghai Parasol Renewable Energy Co., Ltd | Heliostat correction system based on celestial body images and its method |
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