WO2014015773A1 - 一种用于碟式太阳能热发电系统的对日跟踪方法和系统 - Google Patents
一种用于碟式太阳能热发电系统的对日跟踪方法和系统 Download PDFInfo
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- WO2014015773A1 WO2014015773A1 PCT/CN2013/079794 CN2013079794W WO2014015773A1 WO 2014015773 A1 WO2014015773 A1 WO 2014015773A1 CN 2013079794 W CN2013079794 W CN 2013079794W WO 2014015773 A1 WO2014015773 A1 WO 2014015773A1
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- power generation
- generation system
- solar thermal
- tracking
- concentrating
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D3/00—Control of position or direction
- G05D3/10—Control of position or direction without using feedback
- G05D3/105—Solar tracker
Definitions
- the invention relates to a method and system for tracking a solar thermal power generation system.
- the application is submitted to the Chinese Patent Office on July 23, 2012, and the application number is 201210255749.1.
- the invention is entitled "A solar thermal power generation for a dish.”
- the present invention relates to the field of solar power generation technology, and in particular to a method and system for tracking a day for a dish type solar thermal generation system. Background technique
- Dish-type concentrating solar thermal power generation is currently the most efficient solar power generation method with a maximum efficiency of 29.4%. It is expected that in the future, industrialized large-scale applications will be realized, and the cost will be greatly reduced, which will become a new energy power generation that competes with large-scale conventional power plants.
- the dish-type solar thermal power generation system generally has a small power of about 5-100 KW, so that it can realize separate distributed power generation, and it can also carry out large-scale power generation by multiple single-unit networks. The application range is very wide, and it is currently the global solar power generation. Research hotspots.
- the principle of dish-type concentrating solar thermal power generation is to use the concentrating mirror that automatically tracks the sun to focus the solar energy on the collector of the heat engine, thereby heating the engine to perform motion work, and the engine drags the generator to realize power generation.
- the automatic tracking system for the sun is one of its key components.
- the technical problem to be solved by the present invention is to provide a method and system for tracking the sun for a solar thermal power generation system, to improve the tracking accuracy of sunlight, and to enhance the concentrating effect of the solar thermal power generation system on the incident light of sunlight.
- the present invention provides a day tracking method for a dish type solar thermal power generation system, the solar thermal power generation system is provided with a concentrating disc and a heat collector, and the method for tracking the date includes the following steps:
- the temperature distribution image of the collector is obtained by using infrared thermal imaging.
- the method further comprises:
- Step 4) judging whether the collector is overheated, if yes, proceeding to step 5), if not, performing step 6);
- the method further comprises:
- step 10 After performing step 10) and step 3), both return to step 1).
- the invention provides a tracking method for a solar thermal power generation system of a dish type, firstly obtaining temperature distribution information of the collector; and then determining that the solar incident light is concentrated according to the temperature distribution information Whether the disc is fully focused after concentrating, if it is, keep the current angle of the concentrating disc unchanged, if not, obtain the current angle of the concentrating disc, and the target angle of the concentrating disc required for full focus, and adjust the current angle of the concentrating disc to Target angle.
- the tracking method provided by the invention obtains the current focusing condition by analyzing the temperature distribution information in the collector, and corrects the position of the concentrating disc by the method of deviation adjustment according to the current focusing condition, thereby realizing accurate tracking of the sun and enhancing the pair.
- the present invention also provides a day tracking system for a dish type solar thermal power generation system, the solar thermal power generation system including a concentrating disk and a heat collector; the day tracking system includes a collector thermal imaging device, and micro processing And position detecting device;
- the position detecting device is configured to detect a current angle of the concentrating disc of the solar thermal power generation system, and output the same to the microprocessor;
- the collector thermal imaging device is aligned with a collector chamber of the collector for collecting a temperature distribution of the collector and its periphery;
- the microprocessor is connected to the collector thermal imaging device, and configured to determine, according to the temperature distribution information, whether the solar incident light is completely focused after being collected by the concentrating disc, and acquire the poly when the focus is not completely focused.
- the current angle of the disc is analyzed to calculate the target angle of the concentrating disc required for full focus, and a control command is issued to adjust the current angle of the concentrating disc to the target angle.
- the thermal imaging device is an infrared thermal imaging device.
- the controller is further configured to determine whether the heat collector is overheated, and to turn on the overheat protection device of the solar thermal power generation system if the collector is overheated.
- the method further comprises a wind speed and direction detecting device for detecting the current wind speed, the current wind direction, and outputting the detection result to the microprocessor, wherein the microprocessor is further configured to determine whether the wind speed is too large, and the wind speed is too large.
- the wind protection device of the solar thermal power generation system is turned on according to the wind direction.
- the day tracking system is a closed loop control system.
- DRAWINGS 1 is a flow chart of a specific implementation manner of a tracking method according to the present invention
- FIG. 2 is a flow chart of another specific implementation manner of a tracking method according to the present invention
- Figure 3 is an infrared imaging diagram when the current angle of the concentrating disc is the same as the target angle;
- Figure 4 is an infrared imaging diagram when the current height angle of the concentrating disc is too large;
- Figure 5 is an infrared imaging diagram of the current azimuth of the concentrating disc being small
- FIG. 6 is an infrared imaging diagram of a current height angle of the concentrating disc and a current azimuth angle being small;
- FIG. 7 is a structural block diagram of a specific embodiment of the tracking system provided by the present invention;
- microprocessor 1 servo drive system 2; reduction transmission mechanism 3; position detecting device 4; collector thermal imaging device 5; Image interface module 6; wind speed and direction detecting device 7;
- the core of the present invention is to provide a method and system for tracking the sun for a solar thermal power generation system, which can accurately track the sunlight, improve the concentrating effect of the incident light of the sun on the condensed disk, and enhance the solar heat. Power generation efficiency of power generation systems.
- FIG. 1 is a flow chart of a specific implementation manner of a tracking method for a day according to the present invention.
- the present invention provides a method for tracking a day for a solar thermal power generation system.
- the solar thermal power generation system is provided with a concentrating disk 20 and a heat collector 10, and a concentrating disk. 20 Focusing the incident light of the sun, the collector 10 is mounted in front of the focus of the concentrating disc 20 for collecting the heat generated by the focused sunlight.
- the above-mentioned tracking method includes the following steps:
- the heat collector 10 is a device for absorbing solar radiation to convert it into heat energy and transferring it to the heat medium, the portion of the collector 10 having a higher temperature collects more light, so the temperature of the heat collector 10 is The degree distribution information can reflect the focus of the incident light of the sunlight collected by the concentrating disc 20.
- S12 analyzing and calculating the temperature distribution information of the collector, and extracting the relationship between the incident light of the sun and the parabolic concentrating disc according to the reflection principle of the parabolic parallel light, and determining whether the incident light of the sun is concentrated by the concentrating disc 20 Full focus, if yes, go to step S14, if not, go to step S13;
- S13 acquiring a current angle of the concentrating disc 20, and further acquiring a target angle of the concentrating disc 20 required for complete focusing according to the temperature distribution information, and adjusting a current angle of the concentrating disc 20 to a target angle;
- step S13 by comparing the deviation between the current angle of the concentrating disc 20 and the target angle, and adjusting the current angle of the concentrating disc 20 to the target angle by the method of deviation adjustment, it is ensured that the incident light of the sun is concentrated by the concentrating disc 20 to achieve complete focusing. effect.
- the tracking method provided by the present invention knows the current focusing condition by analyzing the temperature distribution information in the collector 10, and corrects the position of the concentrating disc 20 by the method of deviation adjustment according to the current focusing condition, thereby realizing the sun. Accurate tracking enhances the focus accuracy of the sun's incident light.
- the above-mentioned method for tracking the sun must be based on the premise that the spot of the sun's incident light is focused on the collector, and therefore the astronomical algorithm must be used before the implementation of the above-mentioned tracking method.
- the program tracks the sun's trajectory, calculates the coarse elevation angle and azimuth of the sun, and drives the concentrating disc to a direction substantially parallel to the sun's rays to ensure that the focused spot is inside the collector. Since this step is a condition that is inevitably required before the implementation of the present invention, and is a very common step in the prior art, it will not be repeated herein.
- FIG. 2 is a flow chart of another specific implementation manner of the tracking method according to the present invention.
- the foregoing tracking method may specifically include the following steps:
- S21 The temperature distribution image of the heat collector 10 is obtained by infrared thermal imaging.
- an infrared imaging device such as an infrared camera, an infrared camera, or the like, may be disposed in the heat collector 10, and the infrared imaging device is aligned with the collector cavity, and can be directly obtained through the shooting thereof.
- the temperature distribution of the collector 10, that is, the final output of the sun tracking is collected, thereby providing accurate and true reflection information, which lays a good foundation for the subsequent control process.
- the figure is an infrared imaging image when the current angle of the concentrating disc 20 is the same as the target angle.
- the inner circular shadow portion of the infrared imaging image reflects the position of the concentrating disc 20, and the outer cymbal ring portion reflects the sun incidence.
- the position of the light, at this time, the concentrating disc 20 coincides with the center of the solar ring, indicating that the incident light of the sun is completely focused by the concentrating disc 20, and it is not necessary to adjust the position of the concentrating disc 20.
- the figure is an infrared imaging image when the current height angle of the concentrating disc 20 is too large.
- the center of the concentrating disc 20 is biased directly above the center of the solar ring, indicating that the height angle is large, and the processor is at this time.
- a control command is issued to reduce the elevation angle of the concentrating disc 20.
- the figure is an infrared imaging image in which the current azimuth of the concentrating disc 20 is small.
- the center of the concentrating disc 20 is biased to the left of the center of the solar ring, indicating that the azimuth angle is small, and the processor is at this time.
- a control command is issued to increase the azimuth of the concentrating disk 20.
- the figure is an infrared imaging image in which the current elevation angle of the concentrating disc 20 and the current azimuth angle are both small.
- the center of the concentrating disc 20 is biased to the lower left of the center of the solar ring, and the microprocessor sends out The control command increases the azimuth and elevation angle of the concentrating disk 20.
- the height angle and the azimuth angle of the concentrating disc 20 are in the thermal imaging image of the collector 10 corresponding to other large or small cases, and the height angle and the azimuth angle of the concentrating disc 20 are adjusted accordingly to make the concentrating disc. 20 is completely focused. It can be seen that the direct output of the tracking of the daily tracking by the infrared thermal imaging method can provide a clear and straightforward basis for the subsequent control process, so that the entire tracking method has the advantages of novel conception and operation. . Of course, the above-mentioned day tracking method can also obtain the temperature distribution information of the heat collector 10 by other means.
- the method further includes:
- Step S24 determining whether the heat collector 10 is overheated, and if yes, proceeding to step S25, if not, Then executing step S26;
- the collector 10 can be protected to prevent the collector 10 from being ablated due to excessive temperature, thereby further ensuring the operational stability and reliability of the solar thermal power generation system. Since the structure of the overheat protection device is prior art, it will not be described here.
- the foregoing tracking method may further include: Step S27: Acquire a current wind speed and direction signal;
- Step S28 determining whether the wind speed is too large, if yes, executing step S29, if not, executing step S210;
- control method can prevent the damage caused by the excessive wind speed on the concentrating disc 20, and further ensure the working stability of the solar thermal power generation system.
- the collector 10 protects the collector according to whether the collector 10 is overheated, and the method of protecting the condensed disc according to the wind speed and direction signals.
- the steps S24 to S26 are as shown in the foregoing steps S24 to S26.
- the operation, the operations shown in steps S27 to S210 are not limited to the above-described order, and the former may be performed at any time after the temperature distribution information of the heat collector is acquired, and the latter may be performed at any time without limitation. Users can choose according to their actual needs.
- the protection method may return to the step S11, that is, the method for tracking the date may be specifically a closed loop control method.
- the closed-loop control method can realize real-time tracking of the sun by real-time detection of a real-time feedback and real-time control to ensure that the sunlight is completely focused after being collected by the concentrating disc 20.
- the above-mentioned daily tracking method can also adopt other methods of open-loop control such as timing control, and the user can select according to actual needs.
- FIG. 7 is a structural block diagram of a specific implementation manner of a day tracking system according to the present invention
- FIG. 8 is a physical structure cartridge diagram of the day tracking system shown in FIG.
- the present invention further provides a day tracking system for a dish type solar thermal power generation system, comprising a collector thermal imaging device 5, a microprocessor 1 and a position detecting device 4;
- the position detecting device 4 may be specifically a position encoder installed at a terminal of the azimuth and elevation angles of the concentrating disc 10 for detecting the current angle of the concentrating disc 10 of the solar thermal power generation system and outputting it to the microprocessor 1 .
- the collector thermal imaging device 5 is aligned with the collector chamber of the collector 10, as shown in FIG. 8, and may be specifically mounted on a support beam parallel to the collector 20 for the collector thermal imaging device 5
- the temperature distribution information of the collector 20 and its periphery is collected, and the temperature distribution information is actually a temperature distribution image. After the collector thermal imaging device 5 collects the temperature distribution image, the image may be specifically sent to the micro processing through the image interface module 6.
- the microprocessor 1 is connected to the thermal imaging device 5 of the collector for determining whether the incident light of the sun is completely focused after being collected by the concentrating disc 10 according to the temperature distribution information, and acquiring the current angle of the concentrating disc 10 under the condition of incomplete focusing.
- the analysis calculates the target angle of the concentrating disc 10 required for complete focusing, and then calculates the deviation angle between the current angle and the target angle, and issues a control command to the servo drive system 2 of the concentrating disc 10.
- the servo drive system 2 changes the angle of the concentrating disc 10 by a deceleration transmission mechanism 3 (for example, a multi-stage reduction gear or a screw jack), and finally adjusts the concentrating disc 10 Current angle to target angle. Since the servo drive system 2 and the reduction transmission mechanism 3 are commonly used devices in the prior art, they will not be described again.
- a deceleration transmission mechanism 3 for example, a multi-stage reduction gear or a screw jack
- the day-to-day tracking system uses the analysis of the temperature distribution information in the collector 20 to know the current focus condition, and corrects the position of the concentrating disk 10 by the deviation adjustment method according to the current focus condition. Accurate tracking of the sun is achieved, and the focusing accuracy of the incident light of the sun is enhanced.
- the thermal imaging device is an infrared thermal imaging device, such as an infrared camera or an infrared camera.
- the microprocessor 1 is further configured to determine whether the heat collector 20 is overheated, and to turn on the overheat protection device of the solar thermal power generation system when the heat collector 20 is overheated.
- the foregoing tracking system may further include a wind speed and wind direction inspection.
- the measuring device 7 is configured to detect the current wind speed and the current wind direction, and output the detection result to the microprocessor 1.
- the microprocessor 1 is further configured to determine whether the wind speed is too large, and turn on the solar energy according to the wind direction when the wind speed is too large. Wind protection device for thermal power generation systems.
- the above-mentioned day tracking system may be a closed loop control system.
- the tracking system corresponding to the above-mentioned Japanese tracking method should also have corresponding technical effects, and details are not described herein again.
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CN2012102557491A CN102749933A (zh) | 2012-07-23 | 2012-07-23 | 一种用于碟式太阳能热发电系统的对日跟踪方法和系统 |
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Cited By (3)
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CN104142693A (zh) * | 2014-08-07 | 2014-11-12 | 中国电子科技集团公司第五十四研究所 | 一种基于卡尔曼滤波的窄波束角跟踪方法 |
RU2606049C2 (ru) * | 2014-09-12 | 2017-01-10 | Федеральное государственное бюджетное научное учреждение Федеральный научный агроинженерный центр ВИМ (ФГБНУ ФНАЦ ВИМ) | Способ автоматической ориентации по Солнцу источников гелиоэнергетики и контур управления следящей системой |
CN110456828A (zh) * | 2019-08-08 | 2019-11-15 | 西安工业大学 | 小型碟式太阳能温度闭环跟踪系统 |
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CN102749933A (zh) * | 2012-07-23 | 2012-10-24 | 湘电集团有限公司 | 一种用于碟式太阳能热发电系统的对日跟踪方法和系统 |
CN102929300B (zh) * | 2012-11-22 | 2016-04-13 | 宁夏光合能源科技有限公司 | 塔式太阳能集热系统定日镜场顶层控制装置 |
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CN104932543B (zh) * | 2015-05-21 | 2017-10-24 | 张智博 | 用于碟式太阳能发电装置的太阳跟踪控制系统及控制方法 |
CN104914880A (zh) * | 2015-05-21 | 2015-09-16 | 张智博 | 一种用于碟式太阳能发电系统的追日控制方法 |
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