CN115774461A

CN115774461A - Automatic deviation rectifying system of heliostat

Info

Publication number: CN115774461A
Application number: CN202211030426.2A
Authority: CN
Inventors: 杨军峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2023-03-10

Abstract

The invention discloses an automatic deviation rectifying system for a heliostat, which comprises: a photometric plate having a plurality of image acquisition devices regularly arranged in the up-down, left-right directions; and the deviation correcting control system obtains deviation correcting parameters of each heliostat reflecting sunlight onto the photometric plate by analyzing and calculating heliostat images acquired by the plurality of image acquisition devices at a certain moment. The system can simultaneously carry out deviation rectifying test work on the multi-surface heliostat, saves the deviation rectifying test time, can increase the deviation rectifying frequency of the heliostat, and improves the heat collecting efficiency and the system economy of the tower type solar system.

Description

Automatic deviation rectifying system of heliostat

Technical Field

The invention relates to the technical field of tower type solar heat collection, in particular to an automatic deviation rectifying system of a heliostat.

Background

The tower type solar heat collection system is a core system of the tower type solar power generation system and can also be used for other solar heat utilization systems. A high central heat absorption tower is built on the open ground, a heat absorber is fixedly mounted on the top of the tower, a certain number of heliostats are mounted around the tower, sunlight (direct light part) is reflected and gathered on the heat absorber on the top of the tower through the heliostats, high-temperature steam is directly or indirectly generated to push a steam turbine to generate electricity, and the high-temperature steam can also be used for heating different media to obtain heat sources with different temperatures and used for the fields of electricity generation or other solar heat utilization.

The process of the heliostat reflecting sunlight to the absorber is called sun tracking. Theoretically, in the sun tracking process, the control system calculates theoretical horizontal direction and pitch direction tracking parameters of each heliostat according to time, the running rule of the sun and the earth, the coordinate and the altitude of each heliostat and the coordinate and the altitude of the heat absorber, and the heliostat can reflect sunlight to the heat absorber according to the tracking of the parameters and enables the center of a reflected light spot of the heliostat to be located at the theoretical center position of the reflected light spot. However, in practice, during the operation of the heliostat, due to various reasons such as the mechanism and installation of the heliostat, the heliostat tracks the center of the reflected sunlight spot to have a certain deviation from the theoretical center of the reflected light spot according to the theoretical tracking parameter, and in order to ensure the safety and performance of the system, the deviation correction test needs to be frequently performed on each heliostat to obtain the deviation correction parameter, so that the heliostat operates according to the tracking parameter corrected by the deviation correction parameter during sun tracking, the focusing precision of the heliostat is ensured, the heat absorber is ensured not to have local over-temperature, and the heat collection efficiency of the system is ensured. The traditional debugging mode is as follows: one or more test boards (generally white, also called white boards) are installed at the lower part of the heat absorber, a tower body at the lower part of the heat absorber is also used as a white board, then one or more electronic cameras (electronic cameras) are installed in a heliostat field (ground), when the deviation rectifying test is carried out, a certain heliostat reflects the direct solar light to the test board according to the tracking parameters given by a control system, if the control system detects that the deviation between the center of the reflected light spot of the heliostat and the target center of the test light spot on the test board exceeds the allowable range of focusing error, the control system calculates the tracking parameters in the horizontal direction and the pitching direction when the heliostat carries out the deviation rectifying test again according to the measured deviation value, so that the center of the reflected light spot of the heliostat is further close to the center of the deviation rectifying test, the process can be repeated for one or more times until the center of the reflected light spot of the heliostat and the target center of the test light spot on the deviation rectifying test board are within the allowable range of the error, at the moment, the control system calculates the corrected values (namely the corrected values for determining the tracking parameters in the horizontal direction and the heliostat finishes the deviation rectifying test.

The traditional heliostat deviation rectifying test mode is that one test board and one electronic camera can only test one heliostat at one time, for a large tower type solar heat collecting system, thousands of heliostats are often generated, and a long time is needed for completing one round of deviation rectifying test work for a heliostat field consisting of thousands of heliostats. The heliostats need to be rectified frequently in the operation process of the system, and the rectifying frequency of the heliostats is limited due to the fact that the time required for completing one-round rectifying operation of all the heliostats is long, so that the focusing precision of the heliostats is limited, and on one hand, the heat absorber is damaged due to the fact that the heat absorber is over-heated locally in the operation process; on the other hand, the reflected light overflowing the heat absorber is more, and the heat collection efficiency and the economy of the system are limited.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The invention aims to provide an efficient automatic deviation rectifying system for heliostats, which can be used for simultaneously carrying out deviation rectifying tests on multiple heliostats and improving the deviation rectifying work efficiency.

In order to achieve the above object, the present invention provides an automatic deviation rectifying system for a heliostat, the system comprising:

a photometric plate having a plurality of image acquisition devices regularly arranged in the up-down, left-right directions;

and the deviation correcting control system obtains deviation correcting parameters of each heliostat reflecting sunlight onto the photometric plate by analyzing and calculating heliostat images acquired by the plurality of image acquisition devices at a certain moment.

Alternatively or preferably, the photometric plate with a plurality of image capturing devices regularly arranged in the up-down, left-right direction further includes:

a light shielding plate having a plurality of light leakage holes regularly arranged in the vertical and horizontal directions;

and an image acquisition device is arranged behind each light leakage hole.

Alternatively or preferably, the light shielding plate with a plurality of light leakage holes regularly arranged in the up-down, left-right directions further comprises:

the surface of the light shielding plate, which receives the reflected light of the heliostat, has higher reflectivity so as to reduce the radiation quantity of the reflected light of the heliostat.

the shading plate is made of a material with good heat conduction performance, so that the shading plate has good heat dissipation performance.

the shading plate is provided with heat dissipation fins for enhancing the heat dissipation of the shading plate.

Optionally or preferably, an image capturing device is installed behind each light leakage hole, and the image capturing device further includes:

each image acquisition device can simultaneously acquire images of a plurality of heliostats;

each image acquisition device can receive the reflected light of a plurality of heliostats at the same time.

and a shutter is arranged between each shading hole and the image acquisition device arranged behind the shading hole and used for reducing the time for the image acquisition device to receive reflected light radiation of the heliostat and preventing the image acquisition device from being damaged due to the fact that the image acquisition device receives strong light radiation for a long time.

a filter lens is mounted in front of the lens of the image acquisition device and used for reducing the radiation quantity of heliostat reflected light received by a photosensitive component of the image acquisition device and preventing the image acquisition device from being damaged due to over-strong radiation.

Optionally or preferably, the deviation rectification control system for obtaining the deviation rectification parameters of each heliostat reflecting sunlight onto the light metering plate by analyzing and calculating images of the heliostats collected by the plurality of image collecting devices at a certain moment further includes:

the deviation rectification control system consists of computer hardware, software and a data transmission device which is connected with the computer, the light measurement plate and a driving device of the heliostat.

the deviation rectifying control system sends deviation rectifying test instructions to a plurality of heliostats needing to enter a deviation rectifying test program, and the heliostats receiving the deviation rectifying test instructions are driven by the driving device to reflect sunlight to the center of the deviation rectifying test target of the light measuring plate according to the current tracking deviation rectifying parameters;

the deviation correction control system issues an image acquisition instruction to the light measurement plate so that a plurality of shutters and a plurality of image acquisition devices of the light measurement plate act in a coordinated manner: and opening a plurality of shutters, rapidly and respectively acquiring images of the multi-surface heliostat, closing the opened shutters and transmitting the acquired images to the deviation rectification control system.

The deviation rectification control system receives a plurality of heliostat images collected at the same time from the plurality of image collecting devices, and analyzes and calculates the central position of actually-measured reflected light spots of each heliostat for reflecting sunlight onto the light measuring plate at the image collecting time according to the image brightness of each heliostat in each image and the position of the image collecting device for collecting each image on the light measuring plate;

the deviation rectifying control system judges whether deviation between the actually measured reflected light spot center of a certain heliostat and a deviation rectifying test target center meets the deviation rectifying precision requirement or not according to the calculated actually measured reflected light spot center position of each heliostat for reflecting sunlight onto the light measuring plate, if not, the deviation rectifying parameters of the heliostat need to be adjusted to perform deviation rectifying test again, so that the actually measured reflected light spot center of the heliostat is further close to the deviation rectifying test target center until the deviation rectifying control system judges that the deviation between the actually measured reflected light spot center of the certain heliostat and the deviation rectifying test target center meets the deviation rectifying precision requirement; if the deviation of the center of the actually measured reflected light spot of a certain heliostat and the deviation-rectifying test target center meets the deviation-rectifying precision requirement, calculating the deviation-rectifying parameters of the heliostat at the image acquisition moment according to the current actually measured reflected light spot center position of the heliostat and storing the deviation-rectifying parameters into a database, and completing the current deviation-rectifying test of the heliostat.

After adopting the technical scheme, compared with the prior art, the invention at least has the following beneficial effects:

by the method, deviation rectifying tests can be simultaneously performed on the multiple heliostats, so that deviation rectifying test time is saved, deviation rectifying frequency of the heliostats can be increased, focusing precision of the heliostats is improved, and heat collecting efficiency and economy of the tower type solar system are improved.

Drawings

FIG. 1 is an architectural diagram of an automatic deviation rectification system for a heliostat, according to an embodiment of the invention;

FIG. 2 is a schematic diagram of a light measuring plate according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a reflected light spot of a heliostat on a light measurement panel according to an embodiment of the present invention;

fig. 4 is a schematic diagram of an image acquired by the image acquisition device corresponding to the image in fig. 3 according to an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides an automatic deviation rectifying system for a heliostat, which is used for a tower type solar heat collecting system and can be used for but not limited to a tower type solar power generation system, wherein the tower type solar heat collecting system comprises the heliostat, a heat absorption tower and a heat absorber, the heat absorber is arranged on the heat absorption tower, and the heliostat reflects sunlight onto the heat absorber to heat the heat absorber. In the sun tracking process of the heliostat, due to various reasons such as machinery and installation of the heliostat, the heliostat tracks the center of a reflected sunlight facula and has certain deviation with the theoretical center of the reflected light facula according to theoretical tracking parameters, in order to ensure the safety and the performance of the system, the deviation rectification test is frequently carried out on each heliostat to obtain deviation rectification parameters, so that the heliostat runs according to the tracking parameters corrected by the deviation rectification parameters when tracking the sun, the focusing precision of the heliostat is ensured, the heat absorber is ensured not to be over-heated locally, and the heat collection efficiency of the system is ensured. A traditional heliostat deviation rectification test mode needs a long time to finish a round of deviation rectification test work, and the deviation rectification frequency of the heliostat is limited, so that the focusing precision of the heliostat is limited, a heat absorber is easily damaged, and the heat collection efficiency and the economy of a system are also limited.

The automatic deviation rectifying system for heliostat provided by the embodiment of the invention is provided at least for solving part of the problems. The automatic deviation rectifying system can be realized in a system shown in the figure I, the system comprises a light measuring plate 100 and a deviation rectifying control system 200, the light measuring plate 100 can be realized by a structure shown in the figure II, the light measuring plate 100 consists of a light shielding plate 101, a plurality of shutters 102, a plurality of filters 103 and a plurality of image acquisition devices 104, and the light shielding plate 101 can comprise a light leakage plate main body 101-1, a plurality of light leakage holes 101-2 and a plurality of heat dissipation fins 101-3. The deviation rectifying control system 200 may be configured to issue a deviation rectifying control instruction to the multiple heliostats 300 and the light measuring panel 100, so that the multiple heliostats 300 and the light measuring panel 100 enter a deviation rectifying test procedure, receive images collected by the multiple image collecting devices 104, and perform processing, analyzing, and calculating on the received images to obtain deviation rectifying data of each heliostat 300 that reflects the reflected light onto the light measuring panel 100. It should be understood that the deviation rectifying control system 200 may have a heliostat sun tracking control function in addition to the above deviation rectifying test function; the light measurement plate 100 is fixedly arranged on the heat absorption tower 400 and positioned below the heat absorber 500, and the light shielding plate 101 is composed of a light shielding plate main body 101-1, a plurality of light leakage holes 101-2 and a plurality of heat dissipation fins 101-3, wherein the light leakage holes 101-2 are regularly distributed in the vertical and horizontal directions. In order to avoid damage to the light shielding plate due to excessive temperature caused by light irradiation reflected by the multi-faceted heliostat 300, the following measures are taken: the surface of the light shielding plate 101 receiving the reflected light of the heliostat has higher reflectivity so as to reduce the radiation quantity of the reflected light of the heliostat 300; the light shielding plate 101 is made of a material having good thermal conductivity. So that the light shielding plate 101 has good heat dissipation performance. It should be understood that the heat dissipation can also be enhanced in the form of a closed forced convection heat dissipation flow channel, or no measures for enhancing the heat dissipation can be taken; behind each light leakage hole 101-2 are mounted a shutter 102, a filter 103, and an image acquisition device 104 in sequence, wherein the shutter 102 and the filter 103 are provided for protecting the image acquisition device 104, and the purpose is to prevent the image acquisition device 104 from being damaged by receiving strong light radiation for a long time. It should be understood that a plurality of image capturing devices 104 may also share one shutter 102 or one filter 103, and the shutter 102 or the filter 103 may also be included in the image capturing devices 104. The image capturing device 104 in this embodiment may be, but is not limited to, a video camera or a camera.

In this embodiment, the deviation rectifying test target center: the target position of the center of the reflected light spot on the test board 100 is determined by the deviation rectifying control system 200 when the heliostat 300 performs deviation rectifying test. Actually measuring the boundary of the reflected light spot: the deviation rectification control system 200 analyzes and calculates the reflected light spot boundary of each heliostat reflecting sunlight to the light measurement plate, which is obtained by the heliostat images collected by a plurality of image collection devices at a certain moment. Actually measuring the center of a reflected light spot: the deviation rectification control system 200 analyzes and calculates the reflected light spot center of each heliostat reflecting sunlight to the light measurement plate, wherein the reflected light spot center is obtained by the heliostat images collected by a plurality of image collection devices at a certain moment.

It should be understood that in different embodiments, hardware devices in the system can be optionally added, reduced or replaced, and the system structure shown in fig. 1 and the light measuring board structure schematic diagram shown in fig. 2 do not limit the protection scope of the present invention.

The deviation rectifying test process of the heliostat automatic deviation rectifying system provided by the embodiment of the invention comprises the following two parts of work:

a first part: preparation before deviation correction test

Before the first deviation rectifying test, two preparation works need to be completed:

first, before performing the first deviation rectification test, the number and the corresponding position of the heliostat 300 in the image collected by each image collection device 104 need to be determined. Before the first deviation rectifying test, the deviation rectifying control system 200 determines the number and the corresponding position of each heliostat 300 according to at least one image, and in the process, the following modes can be adopted: each image acquisition device 104 can shoot the multi-faceted heliostat 300 during the rectification test, then the number and the corresponding position of each heliostat 300 in the image are determined according to the number and the corresponding position of the heliostat 300 with obvious position characteristics and the number and the corresponding position information of the multi-faceted heliostat 300, and the numbers and the corresponding positions are stored in the rectification control system 200, the position of each image acquisition device 104 and the focal length of the lens thereof are kept unchanged in the subsequent rectification test, the position of each heliostat 300 in the image acquired by a certain image acquisition device 104 is also unchanged, and thus the rectification control system 200 can identify the number of each heliostat 300 in the image acquired by each image acquisition device 104. It should be appreciated that there are many ways to determine the position of each heliostat 300 in the image, and a detailed description thereof is omitted here.

Secondly, through tests, different brightness parameters of the image of the heliostat 300 in the image collected by the image collecting device 104 under two conditions that the single heliostat 300 reflects the reflected light to the image collecting device 104 and does not reflect the reflected light to the image collecting device 104 are measured, and the brightness threshold of the reflected light of the image of the heliostat 300 is reasonably set, so that the deviation rectification control system 200 correctly judges: when the image brightness of a certain heliostat 300 in the image is greater than or equal to the heliostat image reflected light brightness threshold, the heliostat 300 reflects the reflected light to the image acquisition device 104 for acquiring the image; when the image brightness of a heliostat 300 in an image is less than the heliostat image reflected light brightness threshold, the heliostat does not reflect the reflected light to the image capture device 104 that captured the image. The test may be performed with multiple heliostats 300 and multiple image acquisition devices 104 to ensure that the heliostat image reflected light brightness threshold is suitable for analysis and calculation of heliostat images acquired by all image acquisition devices. The heliostat image reflected light brightness threshold value is determined through experiments and then stored in a deviation correction control system, and generally cannot be changed in the subsequent deviation correction test.

A second part: deviation rectification test

The correction test comprises the following specific procedures:

the first step is as follows: the deviation rectifying control system 200 sends a focusing test instruction to the multi-faceted heliostat 300, and the multi-faceted heliostat 300 adjusts the reflection angle according to the tracking parameters given by the deviation rectifying control system 200, and enters a deviation rectifying test state.

The second step is that: the deviation rectification control system 200 sends an image acquisition command to the light measurement panel 100 to make the plurality of shutters 102 and the plurality of image acquisition devices 104 of the light measurement panel 100 cooperate: the plurality of shutters 102 are opened, then images of the multi-faceted heliostats are rapidly collected, respectively, and then the opened shutters 102 are closed, and the collected images are transmitted to the deskew control system 200.

The third step: the rectification control system 200 receives images acquired by the plurality of image acquisition devices 104.

The fourth step: the deviation rectification control system 200 analyzes and calculates the actually measured reflected light spot boundary and the actually measured reflected light spot center of each heliostat 300 according to the number and the corresponding position of the heliostat 300 in the stored image acquired by each image acquisition device 104, the brightness of the image corresponding to the heliostat 300 in each image and the heliostat image reflected light brightness threshold value, and the position of the image acquisition device acquiring the corresponding heliostat image on the light metering plate 100. Specifically, in the image collecting process, the brightness of the images of the same heliostat 300, which may be collected by the image collecting devices 104 at different positions, is different, and when the brightness of the image of the corresponding heliostat 300 in the image collected by a certain image collecting device 104 is greater than or equal to the heliostat image reflection light brightness threshold, it is determined that the image collecting device 104 collects the reflection light of the corresponding heliostat 300, that is, it is determined that the reflection light spot of the heliostat 300 covers the position of the image collecting device 104. The center of the actually measured reflected light spot of the heliostat 300 is obtained by calculating the center position of the area formed by the positions of the image acquisition devices 104 covered by the reflected light spot of the heliostat 300, in the process, the positions of a plurality of adjacent image acquisition devices 104 which are outermost in the area formed by the image acquisition devices 104 can be sequentially connected, so that a closed graph is formed, then the center position of the graph is calculated, and the center position of the test light spot can be obtained. As shown in fig. 3, in order to distinguish different image capturing devices 104 on the light measuring panel 100, different numbers are used to distinguish the different image capturing devices 104 in the figure, and the center of the deviation rectifying test target is at O. The actual reflected light spot for heliostat number 301 is numbered 301', the actual reflected light spot for heliostat number 302 is numbered 302', and the actual reflected light spot for heliostat number 303 is numbered 303'. Number 301 'the reflected light spot center is at O'. 301' light spots cover 9 image acquisition devices, the numbers are 33, 43, 53, 34, 44, 54, 35, 45, and 55, the brightness of the heliostat image with the number 301 in the images acquired by the 9 image acquisition devices is greater than or equal to the heliostat image reflection brightness threshold, at this time, the deviation rectification control system analyzes and calculates the actually measured heliostat reflection light spot boundary of the heliostat with the number 301 as a polygon 301 formed by the connection lines of the image acquisition devices with the numbers 33-43-53-54-55-45-35-34-33 ", the actually measured heliostat reflecting light spot of the numbered 301 heliostat is the inner area of a polygon 301' formed by connecting lines of the numbered 33-43-53-54-55-45-35-34-33 image acquisition devices, the center of the polygon 301' is positioned at the position O ', namely the actually measured heliostat reflecting light spot of the numbered 301 heliostat is positioned at the position O '. And delta X ' and delta Z ' are the difference between the actual reflected light spot 301' center O ' of the heliostat of the serial number 301 and the deviation rectification test target center O in the X direction (corresponding to horizontal direction tracking of the heliostat) and the Z direction (corresponding to pitching direction tracking of the heliostat), and delta X ' and delta Z ' are the difference between the actual reflected light spot center O ' of the heliostat of the serial number 301 and the deviation rectification test target center O in the X direction and the Z direction. If the delta X and the delta Z do not meet the requirement of the deviation correction precision, the deviation correction control system issues a tracking parameter adjusting instruction for correcting the numbered 301 heliostat according to the horizontal direction and the pitching direction calculated by the delta X and the delta Z, and performs the first step to the fourth step procedure together with other heliostats needing to be adjusted again for deviation correction test and other heliostats entering the deviation correction procedure again, wherein the process can be repeated one or more times until the delta X and the delta Z meet the requirement of the deviation correction precision; if the delta X and the delta Z meet the requirement of the rectification precision, the rectification control system calculates and stores the rectification parameters of the numbered 301 heliostat at the image acquisition time according to the delta X and the delta Z, and the rectification test work of the numbered 301 heliostat is finished.

It can also be seen from fig. 3: the actual reflected light spot boundary of the heliostat may not be consistent with the actual measured heliostat reflected light spot boundary, and the actual reflected light spot center may not be consistent with the actual measured heliostat reflected light spot center (for example, the actual reflected light spot 301' of the numbered 301 heliostat may not be consistent with the actual measured heliostat reflected light spot 301 ″ boundary and center), so that the measured and calculated deviation-correcting data has a certain measurement error (for the numbered heliostat 301 deviation-correcting data, the horizontal direction error is Δ X ″ - Δ X ', and the pitch direction error is Δ Z ″ - Δ Z '), which requires that the installation and arrangement interval of the image acquisition device is small enough, so that the deviation-correcting data error calculated by the deviation-correcting control system is within the allowable range.

It should be understood that, the actual heliostat reflected light spot is affected by various factors, such as the reflection angle, the heliostat machinery or installation, etc., the spot shape is generally not a regular circle, but the qualified heliostat reflected light spot should be a continuous plane, and the spot shape does not affect the measurement and analysis of the heliostat reflected light spot boundary, the heliostat reflected light spot center and the heliostat rectification data of the heliostat automatic rectification system provided by the invention.

Fig. 4 is a schematic diagram of an image collected by a partial image collecting device corresponding to fig. 3, which is drawn to facilitate understanding that the heliostat automatic deviation rectifying system provided by the present invention can simultaneously perform deviation rectifying test operation on multiple heliostats. According to the test for measuring the brightness threshold of the heliostat reflection, it can be considered that: when an image acquisition device receives reflected light of a certain heliostat, the brightness of the heliostat image in the image acquired by the image acquisition device is greater than or equal to the heliostat reflected light brightness threshold value, as shown in fig. 4, the image acquisition device with the number 33 receives only the reflected light of the heliostat with the number 301, the image acquisition device with the number 53 receives the reflected light of the heliostats with the

numbers

301 and 302, the image acquisition device with the number 45 receives the reflected light of the heliostats with the

numbers

301 and 303, and the image acquisition device with the number 55 receives the reflected light of the heliostats with the

numbers

301, 302 and 303. After the images are received by the deviation rectifying control system, the deviation rectifying control system can calculate the reflected light spot boundary and the light spot center of the multi-surface heliostat, wherein the image brightness of the heliostat is more than or equal to the heliostat reflection brightness threshold value, and the deviation rectifying work efficiency is greatly improved.

The automatic deviation rectifying system for the heliostat provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. An automated heliostat rectification system, the system comprising:

2. The system of claim 1, wherein the light measuring panel with a plurality of image capturing devices regularly arranged in up, down, left, and right directions further comprises:

and an image acquisition device is arranged behind each light leakage hole.

3. The system of claim 2, wherein the light blocking plate with the plurality of light leakage holes regularly arranged in the up-down, left-right directions further comprises:

the surface of the light shielding plate for receiving the reflected light of the heliostat has higher reflectivity so as to reduce the radiation quantity for absorbing the reflected light of the heliostat.

4. The system of claim 2, wherein the mask with a plurality of light leakage holes regularly arranged in up, down, left, and right directions further comprises:

5. The system of claim 2, wherein the light blocking plate with the plurality of light leakage holes regularly arranged in the up-down, left-right directions further comprises:

6. The system of claim 2, wherein an image capture device is mounted behind each of said light leak holes, further comprising:

7. The system of claim 2, wherein an image capture device is mounted behind each of said light leak holes, further comprising:

and a shutter is arranged between each shading hole and the image acquisition device arranged behind the shading hole and is used for reducing the time for the image acquisition device to receive reflected light radiation of the heliostat and preventing the image acquisition device from being damaged due to the fact that the image acquisition device receives strong light radiation for a long time.

8. The system of claim 2, wherein an image capture device is mounted behind each of said light leak holes, further comprising:

the image acquisition device is characterized in that a filter lens is arranged in front of the lens of the image acquisition device and used for reducing the radiation quantity of heliostat reflected light received by a photosensitive part of the image acquisition device and preventing the image acquisition device from being damaged due to over-strong received radiation.

9. The system of claim 1, wherein the deviation correction control system obtains deviation correction parameters for each heliostat reflecting sunlight onto the light measuring plate by analyzing and calculating images of the heliostats collected by the plurality of image collecting devices at a certain time, further comprising:

the deviation rectifying control system consists of computer hardware, software and a data transmission device which is connected with the computer, the light measuring plate and a driving device of the heliostat.

10. The system of claim 1, wherein the deviation correction control system obtains deviation correction parameters for each heliostat reflecting sunlight onto the light measuring plate by analyzing and calculating images of the heliostats collected by the plurality of image collecting devices at a certain time, further comprising:

the deviation rectification control system issues an image acquisition instruction to the light measurement plate so as to enable a plurality of shutters and a plurality of image acquisition devices of the light measurement plate to act in a coordinated manner: and opening a plurality of shutters, rapidly and respectively acquiring images of the multi-surface heliostat, closing the opened shutters and transmitting the acquired images to the deviation rectification control system.

the deviation rectifying control system judges whether deviation between the actually measured reflected light spot center of a certain heliostat and a deviation rectifying test target center meets the deviation rectifying precision requirement or not according to the calculated actually measured reflected light spot center position of each heliostat for reflecting sunlight onto the light measuring plate, if not, the deviation rectifying parameters of the heliostat need to be adjusted to perform deviation rectifying test again, so that the actually measured reflected light spot center of the heliostat is further close to the deviation rectifying test target center until the deviation rectifying control system judges that the deviation between the actually measured reflected light spot center of the certain heliostat and the deviation rectifying test target center meets the deviation rectifying precision requirement; if the deviation correction control system judges that the deviation between the actually measured reflected light spot center of a certain heliostat and the deviation correction test target center meets the deviation correction precision requirement, calculating the deviation correction parameters of the heliostat at the image acquisition moment according to the actually measured reflected light spot center position of the current heliostat and storing the deviation correction parameters into a database, and finishing the deviation correction test of the heliostat.