CN114244257A - Single-axis tracking solar photovoltaic photo-thermal system - Google Patents
Single-axis tracking solar photovoltaic photo-thermal system Download PDFInfo
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- CN114244257A CN114244257A CN202111348874.2A CN202111348874A CN114244257A CN 114244257 A CN114244257 A CN 114244257A CN 202111348874 A CN202111348874 A CN 202111348874A CN 114244257 A CN114244257 A CN 114244257A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S20/00—Supporting structures for PV modules
- H02S20/30—Supporting structures being movable or adjustable, e.g. for angle adjustment
- H02S20/32—Supporting structures being movable or adjustable, e.g. for angle adjustment specially adapted for solar tracking
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S30/00—Arrangements for moving or orienting solar heat collector modules
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/20—Optical components
- H02S40/22—Light-reflecting or light-concentrating means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/40—Thermal components
- H02S40/42—Cooling means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/40—Thermal components
- H02S40/44—Means to utilise heat energy, e.g. hybrid systems producing warm water and electricity at the same time
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/47—Mountings or tracking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/52—PV systems with concentrators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/60—Thermal-PV hybrids
Abstract
The invention relates to a single-axis tracking solar photovoltaic photo-thermal system which comprises a photovoltaic photo-thermal component, tracking correction equipment, a control cabinet, a storage battery pack, MPPT equipment and an inverter. The control logic preset in the control cabinet realizes coarse adjustment of single-axis tracking, and the tracking correction equipment realizes correction of the result of the coarse adjustment of the single-axis tracking, so that the out-of-plane normal of the solar panel is always opposite to the sun, and accurate tracking of the single axis is realized. The invention combines the photovoltaic photo-thermal technology with the low-power light condensation and is matched with a single-axis tracking system, thereby realizing the high-efficiency utilization of solar irradiation and greatly improving the overall energy conversion efficiency.
Description
Technical Field
The invention belongs to the field of solar photovoltaics, relates to a concentrating photovoltaic photo-thermal technology, and particularly relates to a single-axis tracking solar photovoltaic photo-thermal system.
Background
Solar photovoltaics are technologies that utilize the photovoltaic effect to convert sunlight directly into electrical energy, relying on conversion devices that are solar cells. Because the external quantum efficiency of the solar cell to each spectrum of the incident sunlight is different, the total conversion efficiency is less than 100%, and a large amount of unused energy exists. Most of the unused energy is converted into heat energy, so that the temperature of the solar cell is increased (the conversion efficiency of the solar cell can be reduced), the solar cell is dissipated to the outside, the temperature of the cell panel is reduced, the photoelectric efficiency is improved, the part of energy is fully utilized, the total utilization efficiency is improved, and the solar photovoltaic photo-thermal technology is developed at the same time.
Concentrating photovoltaic photo-thermal as a solar photovoltaic photo-thermal technology can significantly increase the solar energy density on the surface of a solar cell. The solar cell can be saved, and simultaneously, more solar energy can be converted. Under the condition of reasonably designing the structure, the solar cell can improve the efficiency of the solar cell, provide higher-quality heat energy and obtain higher energy conversion efficiency. The low-power condensation not only keeps the advantages of the condensation photovoltaic photo-thermal technology, but also is convenient for improving the original photovoltaic assembly, and the temperature of the hot fluid provided by the low-power condensation photovoltaic photo-thermal technology can meet the use requirement of daily life.
The use of the tracking system enables the received irradiance to be higher (especially direct radiation with high proportion in the solar radiation received on the ground), the output of energy to be increased, the uniformity of the received irradiance to be better, the photovoltaic characteristic of the solar panel to be improved, and the output power to be improved. Compared with a non-tracking system, the single-shaft tracking system has the characteristics of high energy density, high heat quality produced by the system and the like; compared with a double-shaft tracking system, the system has the advantages of small number of motors, lower installation and maintenance cost and higher competitiveness in economy and applicability. Unlike the biaxial solar tracking, the light condensing technology suitable for low-power light condensing is not mature, and there is no sound tracking system, and the general realization method is to adjust the rotating angle by comparing the resistance values of the photo resistors on both sides of the baffle, such as patent No. CN 107153431A. These similar solutions require additional costs for concentrating solar energy, such as ensuring that equipment such as patent No. CN107153431A is not obscured by the concentrator. And for a specific situation (such as cloudy weather), the tracking is unstable, and the system efficiency is affected. Therefore, a single-axis tracking logic with strong universality and good integration with a conventional tracking system is needed to realize high-accuracy concentrating solar single-axis tracking with high efficiency, easy modification and good economy.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a single-axis tracking solar photovoltaic photo-thermal system, which combines a photovoltaic photo-thermal technology with low-power condensation and is matched with a single-axis tracking system, so that the high-efficiency utilization of solar irradiation is realized, and the overall energy conversion efficiency is greatly improved.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a single-axis tracking solar photovoltaic photo-thermal system comprises a photovoltaic photo-thermal component, a tracking correction device, a control cabinet, a storage battery, an MPPT device and an inverter,
the control logic preset in the control cabinet realizes coarse adjustment of single-axis tracking, and the tracking correction equipment realizes correction of the result of the coarse adjustment of the single-axis tracking, so that the out-of-plane normal of the solar panel always faces the sun, and accurate single-axis tracking is realized;
the photovoltaic photo-thermal component comprises an upper glass cover plate, a solar cell, a lower glass cover plate and a cooling medium flow passage which are sequentially arranged from top to bottom, and a collecting lens is arranged above the upper glass cover plate;
the tracked sunlight is condensed by the condenser lens and then is projected onto the upper glass cover plate of the photovoltaic photo-thermal component, the solar energy which is not converted into electric energy is converted into heat except the solar energy which is reflected back to the surrounding environment, and the part of heat is absorbed by the heat-conducting fluid in the cooling flow channel of the photovoltaic photo-thermal component except the solar energy which is dissipated to the surrounding environment, so that the light-condensing cogeneration under the uniaxial tracking is realized;
the MPPT equipment enables the generated power of the solar battery to be kept at the maximum value at each moment, the generated power is stored through a storage battery pack or converted into alternating current through an inverter, and the alternating current is boosted and output to a load for use or is connected to a power grid.
Further, the tracking correction device is a sun position sensor.
Further, the control logic of the coarse adjustment of the single-axis tracking is to keep the normal vector at the axis of the plane of the photovoltaic module or parallel to the axis to be aligned with the sun, thereby obtaining the deflection angle pianzhuan of the device,
pianzhuan＝90-arcsin(y/y′)
wherein: y ═ sin (h),
x＝cos(h)*sin(ω)
Z＝cos(h)*cos(ω)
wherein, jiajiaiao is the included angle between the axial direction and the south direction of the equipment, the positive direction of the measurement angle is shown as the arrow in fig. 6, and the interval is (0-180 °);
h is the altitude angle of the sun,
wherein ,
the local latitude is, delta is the declination angle, and omega is the solar hour angle;
wherein, jiajiaiao is an included angle between the axial direction of the equipment and the south direction; solving by taking longitude and latitude and standard time of the location of the equipment, which are obtained by the positioning system, of the solar altitude angle h and the solar time angle omega as parameters;
when the jiajiaiao is less than 90 °, the deflection angle pianzhuan is positive when y '/y decreases and negative when y'/y increases; when jiajiao is equal to 90 °, the deflection angle pianzhuan is negative; when the jiajiaiao is larger than 90 °, the yaw angle pianzhuan is positive when y '/y increases and negative when y'/y decreases, and the single-axis coarse tracking control logic is realized by outputting the yaw angle to the motor.
Furthermore, the collecting mirror is in a shape of a compound paraboloid, and two sides of the short shaft of the photovoltaic photo-thermal component are respectively fixed with one collecting mirror.
Furthermore, the cooling medium flow channel is made of aluminum, and an inlet and an outlet are formed at the bottom of the flow channel and are connected through a hose.
The invention has the advantages and positive effects that:
1. according to the invention, through the additional flow passage, solar energy which is not converted into electric energy can be absorbed, so that electric energy and heat energy are output simultaneously, and the overall efficiency is improved. The heat energy can be directly used, and can also be used as a heat source of other equipment.
2. The invention realizes the coarse adjustment of the single-axis tracking through the preset logic control, and then finely adjusts the tracking through the tracking correction equipment, thereby conveniently and quickly realizing the accurate single-axis tracking.
3. According to the invention, the irradiation amount received by the photovoltaic photo-thermal component is higher by single-axis tracking, the energy output can be increased, and the uniformity of the received irradiation is better, so that the photovoltaic characteristic of a cell panel is improved, and the output power is improved.
4. The photovoltaic and photo-thermal comprehensive utilization system is simple in photovoltaic and photo-thermal comprehensive utilization equipment, convenient for reconstruction of the original photovoltaic module, low in maintenance cost due to the fact that single-shaft tracking is used, and competitive in economy and applicability.
Drawings
FIG. 1 is a perspective view of a photovoltaic and photothermal module;
FIG. 2 is an exploded view of the photovoltaic photothermal assembly;
FIG. 3 is a top view of a cooling medium flow passage;
FIG. 4 is a sectional view of the structure of FIG. 3 taken along line A-A;
FIG. 5 is a block diagram of a single axis tracking photovoltaic photothermal system;
FIG. 6 is a single axis trace logic reference;
fig. 7 is a view of the apparatus shown in view M in fig. 6.
Description of numbering: 1 condensing lens, 2 upper glass cover plates, 3 solar cells, 4 lower glass cover plates, 5 cooling medium flow channels, 6 flow channel inlet and outlet ports, 7 tracking correction equipment, 8 photovoltaic photo-thermal components, 9 control cabinets, 10 storage battery packs, 11 cooling medium outlet pipes, 12MPPT equipment, 13 inverters, 14 loads, 15 power grids, 16 pumps and 17 cooling medium inlet pipes.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
A single-axis tracking solar photovoltaic photo-thermal system is shown in fig. 5 and comprises a photovoltaic photo-thermal assembly 8, a tracking correction device 7, a control cabinet 9, a storage battery pack 10, an MPPT device 12 and an inverter 13, wherein a solar battery 3 of the photovoltaic photo-thermal assembly 8 is connected with the MPPT device 12, the MPPT device 12 is respectively connected with the storage battery pack 10 and the inverter 13, and the inverter 13 is connected with a load 14 and a power grid 15. The photovoltaic photo-thermal component 8 is parallel to the rotating shaft. The tracking correction equipment is perpendicular to the photovoltaic photo-thermal assembly 8 and is connected with the rotating shaft. The motor is located the both sides of axle, provides the rotatory power of multiple spot and conveniently extends.
The photovoltaic photo-thermal component 8 comprises an upper glass cover plate 2, a solar cell 3, a lower glass cover plate 4 and a cooling medium flow channel 5 which are sequentially arranged from top to bottom. A condenser lens 1 is installed above the upper glass cover plate 2. Solar radiation irradiates the upper surface of the upper glass cover plate 2 through the condenser lens 1, and the solar radiation part penetrating through the upper glass cover plate 2 is converted into electric energy by the solar cell 3 to be output. And the part which is not converted into the electric energy is converted into heat and dissipated. This can raise the temperature of the solar cell, reducing cell efficiency. By using the cooling medium common water flowing in the cooling medium flow passage 5, the temperature of the solar cell 3 can be reduced, the photoelectric conversion efficiency of the solar cell 3 can be improved, and heat can be collected, thereby realizing cogeneration and high overall efficiency.
The cooling medium water is pumped from the cooling medium inlet pipe 17 into the water path planned as required by the pump 16, and flows through the cooling medium flow channels 5 of the photovoltaic and photo-thermal modules 8 in sequence to absorb heat. And finally flows out of the cooling medium outlet pipe 11 to be supplied for direct use or as a heat source for other equipment.
The electrical power generated by the solar cells 3 can be kept substantially at a maximum value at each instant by means of the MPPT device 12. The generated electric quantity can be stored by the storage battery pack 10; or the inverter 13 converts the direct current into alternating current, and the alternating current is boosted and output to the load 14 for use or is connected to the power grid 15.
The single-axis tracking of the system is realized by the control cabinet 9 and the tracking correction device 7 together. The controller in the control cabinet 9 outputs a signal to the motor according to the written control logic, thereby controlling the system to rotate around the shaft and realizing coarse adjustment. The tracking correction device 7 compares the photo-resistor resistance values with the sun position sensor as mentioned in CN107153431A to realize fine tuning, so that the single-axis tracking of the sun is more accurate.
The upper part of the photovoltaic photo-thermal component 8 is additionally provided with the compound parabolic condenser 1, and the condenser 1 is responsible for the collection and the guidance of solar light, so that the received solar energy density can be improved, and the light is condensed at low power. The photovoltaic photo-thermal component 8 is cooled by flowing cooling medium, and solar radiation energy which is not converted into electric energy is absorbed. And then realize that above-mentioned low concentration photovoltaic light and heat's energy density is high, easily reforms transform, make full use of solar cell performance's characteristic.
The single-axis tracking is realized by coarse adjustment through preset logic control, and then tracking is finely adjusted through tracking correction equipment, so that the single-axis accurate tracking is realized.
Specific coarse tuning logic is set forth below.
The tracking of the sun, whether uniaxial or biaxial, is based on the parameters of the sun's altitude. The solution idea of the solar altitude angle is as follows, and the parameter labels are shown in fig. 6 and 7:
the included angle between the connecting line between a certain point on the earth and the sun and the ground plane is called as the solar altitude angle h, and the value of the included angle is calculated by the parameters;
wherein ,
the local latitude is 6, the declination angle is 6, and the solar hour angle is omega.
Since direct solar radiation can be considered as parallel light, the implementation of uniaxial tracking is to keep the normal vector at the axis of the plane of the photovoltaic module or parallel to the axis directed at the sun. The deflection angle of the device, pianzhuan, is solved as follows:
pianzhuan＝90-arcsin(y/y′)
wherein: y ═ sin (h),
x＝cos(h)*sin(ω)
z＝cos(h)*cos(ω)
wherein, jiajiaiao is the included angle between the axial direction and the south direction of the equipment, the positive direction of the measurement angle is shown as the arrow in figure 6, and the interval is 0-180 degrees.
Thus, the magnitude of the deflection angle pianzhuan at a certain time can be obtained. And the sun rises to west due to the rotation of the earth, and the analysis by combining equipment can obtain: when the jiajiaiao is less than 90 °, the deflection angle pianzhuan is positive when y '/y decreases and negative when y'/y increases; when jiajiao is equal to 90 °, the deflection angle pianzhuan is negative; when the jiajiao is greater than 90 °, the deflection angle pianzhuan is positive when y '/y increases and negative when y'/y decreases, the positive and negative meanings being shown in fig. 7.
The control program is programmed with the method to realize the control of the motor, and the control logic of the single-axis tracking coarse adjustment part is completed. The concentrating photovoltaic photo-thermal system placed at any angle and any longitude and latitude basically realizes the single-axis tracking of the sun, and the tracking correction equipment is used as fine adjustment to play a role in more accurate tracking.
The tracking correction device is referred to as a sun position sensor as mentioned in CN107153431A, and is not described herein.
The invention designs a single-axis tracking solar photovoltaic photo-thermal system based on a photovoltaic photo-thermal technology; the single-axis tracking is realized by writing a control program into a controller in a control cabinet and assisting tracking correction equipment; compared with a non-tracking system, the solar tracking system is more suitable for a concentrating solar technology, and the received solar radiation quantity is higher; compared with a double-shaft tracking system, the installation and maintenance cost is lower. Any technical solution based on the inventive concept falls into the scope of the present application.
Claims (5)
1. The utility model provides a unipolar tracks of solar photovoltaic light and heat system which characterized in that: comprises a photovoltaic photo-thermal component (8), a tracking correction device (7), a control cabinet (9), a storage battery (10), an MPPT device (12) and an inverter (13),
the control logic preset in the control cabinet (9) realizes coarse adjustment of single-axis tracking, and the tracking correction equipment (7) realizes correction of the result of the single-axis tracking coarse adjustment, so that the out-of-plane normal of the solar panel is always opposite to the sun, and accurate single-axis tracking is realized;
the photovoltaic photo-thermal component (8) comprises an upper glass cover plate (2), a solar cell (3), a lower glass cover plate (4) and a cooling medium flow channel (5) which are sequentially arranged from top to bottom, and a collecting lens (1) is arranged above the upper glass cover plate (2);
the tracked sunlight is condensed by the condenser lens (1) and then is projected onto the upper glass cover plate (2) of the photovoltaic photo-thermal assembly (8), the solar energy which is not converted into electric energy is converted into heat except for being reflected back to the surrounding environment, and the part of heat is absorbed by heat-conducting fluid in a cooling flow channel (5) of the photovoltaic photo-thermal assembly (8) except for being dissipated to the surrounding environment, so that the condensing cogeneration under the uniaxial tracking is realized;
the MPPT device (12) enables the generated power of the solar battery (3) to be kept at the maximum value at each moment, the generated power is stored through a storage battery pack (10) or converted into alternating current through an inverter (13), and the alternating current is boosted and output to a load (14) for use or is connected to a power grid (15).
2. The single-axis tracking solar photovoltaic photo-thermal system according to claim 1, characterized in that: the tracking correction device (7) is a sun position sensor.
3. The single-axis tracking solar photovoltaic photo-thermal system according to claim 1, characterized in that: the control logic of the coarse adjustment of the single-axis tracking is to keep the normal vector at the axis of the plane of the photovoltaic module or parallel to the axis to be aligned with the sun, thereby obtaining the deflection angle pianzhuan of the device,
pianzhuan＝90-arcsin(y/y′)
wherein: y ═ sin (h),
x＝cos(h)*sin(ω)
z＝cos(h)*cos(ω)
wherein, jiajiaiao is the included angle between the axial direction and the south direction of the equipment, the positive direction of the measurement angle is shown as the arrow in fig. 6, and the interval is (0-180 °);
h is the altitude angle of the sun,
wherein ,
the local latitude is, delta is the declination angle, and omega is the solar hour angle;
wherein, jiajiaiao is an included angle between the axial direction of the equipment and the south direction; solving by taking longitude and latitude and standard time of the location of the equipment, which are obtained by the positioning system, of the solar altitude angle h and the solar time angle omega as parameters;
when the jiajiaiao is less than 90 °, the deflection angle pianzhuan is positive when y '/y decreases and negative when y'/y increases; when jiajiao is equal to 90 °, the deflection angle pianzhuan is negative; when the jiajiaiao is larger than 90 °, the yaw angle pianzhuan is positive when y '/y increases and negative when y'/y decreases, and the single-axis coarse tracking control logic is realized by outputting the yaw angle to the motor.
4. The single-axis tracking solar photovoltaic photo-thermal system according to claim 1, characterized in that: the condensing lens (1) is in a composite paraboloid shape, and one sheet is fixed on each of two sides of the short shaft of the photovoltaic photo-thermal component (8).
5. The single-axis tracking solar photovoltaic photo-thermal system according to claim 1, characterized in that: the cooling medium flow channel (5) is made of aluminum materials, and an inlet and an outlet are formed in the bottom of the flow channel and are connected through hoses.
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| CN106230347A (en) * | 2016-07-25 | 2016-12-14 | 武汉理工大学 | Intelligent domestic photovoltaic power generation control system |
| CN106774439A (en) * | 2016-12-08 | 2017-05-31 | 浙江科技学院 | Solar tracking bearing calibration and device based on solar motion rule and IMAQ |
| CN106602986A (en) * | 2016-12-20 | 2017-04-26 | 石健玲 | Sunshine tracking system, solar energy application device and sunshine tracking method |
| CN108662797A (en) * | 2018-04-28 | 2018-10-16 | 上海理工大学 | Heat storage type flat-plate solar heat collector |
| CN211628090U (en) * | 2019-11-11 | 2020-10-02 | 洁源(吉林)电力科技发展有限公司 | Main shaft is from rectifying formal adjustable unipolar photovoltaic tracker |
| CN111003742A (en) * | 2019-12-06 | 2020-04-14 | 华北电力大学 | Seawater desalination system for solar photovoltaic waste heat-joule heat gradient utilization |
| CN211321279U (en) * | 2020-01-19 | 2020-08-21 | 扬州中程智能支架有限公司 | Drive coordinated type photovoltaic tracking support |
| CN215449994U (en) * | 2021-07-28 | 2022-01-07 | 广州市旺日节能科技有限公司 | Light direction tracking system based on multi-sensor information |
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