CN111949051B - Automatic sun tracking control system and method for trough type heliostat field - Google Patents
Automatic sun tracking control system and method for trough type heliostat field Download PDFInfo
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- CN111949051B CN111949051B CN202010734465.5A CN202010734465A CN111949051B CN 111949051 B CN111949051 B CN 111949051B CN 202010734465 A CN202010734465 A CN 202010734465A CN 111949051 B CN111949051 B CN 111949051B
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S50/00—Arrangements for controlling solar heat collectors
- F24S50/20—Arrangements for controlling solar heat collectors for 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
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/47—Mountings or tracking
Abstract
The invention provides a trough heliostat field automatic sun tracking control system and a trough heliostat field automatic sun tracking control method, which are applied to a heat collection system, wherein the system comprises a plurality of driving devices, two thermosensitive circuit modules, a communication system, an automatic control system and a central control system; the driving device is used for providing driving force for the groove type heliostat field; the temperature-sensitive circuit module is used for converting the temperature of sunlight irradiated on the temperature-sensitive circuit module into a voltage signal and sending the voltage signal to a communication system; the communication system is used for receiving the voltage signal transmitted by the thermosensitive circuit module, converting the voltage signal into a digital signal and transmitting the digital signal to the automatic control system and the central control system respectively; the automatic control system is used for receiving the digital signal sent by the communication system and utilizing the digital signal to regulate and control the driving device in real time; and the central control system is used for receiving the digital signals sent by the communication system and receiving feedback signals of the driving device, the automatic control system and the thermosensitive circuit module.
Description
Technical Field
The invention relates to the field of solar power generation, in particular to an automatic sun tracking control system and method for a trough type heliostat field.
Background
The solar photo-thermal power generation technology utilizes a condenser to reflect solar radiation energy to a heat collector, and the heat collector converts the solar radiation energy into heat energy and generates power through a thermal cycle process. As an important mode of solar large-scale power generation, solar photo-thermal power generation has a series of obvious advantages. First, its carbon emissions over its life cycle are very low, only 18g/kWh according to foreign studies. Secondly, the technology has the lowest cost in the existing solar power generation technology, and is easier to rapidly realize large-scale industrialization. Finally, the solar photo-thermal power generation also has the advantage of strong compatibility with the existing thermal power station and power grid system.
The solar photo-thermal power generation technology mainly comprises the following four technologies: trough-type concentrated photovoltaic power generation, tower-type concentrated photovoltaic power generation, disc-type concentrated photovoltaic power generation, and fresnel-type concentrated photovoltaic power generation.
The trough solar thermal power generation technology is that sunlight is converged on a focus through a trough parabolic condenser mirror surface (heliostat), and a heat absorber is arranged on a focal line to absorb focused solar radiation energy. After the fluid in the pipe is heated, the fluid flows through the heat exchanger to heat water to generate steam, and power is generated by means of steam power circulation. The parabolic surface of the groove type condenser performs one-dimensional tracking on the sun, the condensing ratio is 10-100, and the temperature can reach 400 ℃. The technology of trough solar thermal power generation in the middle of the 80's of the 20 th century has been developed, and a 354MW trough type heat-collecting thermal power station is installed in the state of California of the United states at present, the working medium of the power station is heat conduction oil, and a heat exchanger can enable the heat conduction oil to generate superheated steam with the temperature close to 400 ℃ to drive a steam turbine to generate power. At present, the molten salt medium trough type power station is also under development and construction.
The trough type solar thermal power generation system mainly comprises a heat collection system, a heat storage system, a heat exchange system and a power generation system. The heat exchange system and the power generation system are mature in technology and universal in application, no obstacles exist in the development of the trough type solar thermal power generation system technology in China, and the heat collection system and the heat storage system mainly affect the development of the trough type solar thermal power generation technology in China. An automatic sun tracking control system in the heat collection system is an important component, and the power generation amount of the mirror field is closely related to the mirror field control system. The automatic sun tracking control system of the existing trough type heat collecting system has the defects of complex structure and high cost.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an automatic sun tracking control system and method for a trough type heliostat field, which are efficient and low in cost. The technical scheme of the invention is as follows:
a trough heliostat field automatic sun tracking control system is applied to a heat collection system and comprises a plurality of driving devices, two thermosensitive circuit modules, a communication system, an automatic control system and a central control system; wherein:
the driving device is used for providing driving force for the trough type heliostat field, is respectively connected with the automatic control system and the central control system, and receives a control instruction of the automatic control system/the central control system;
the temperature-sensitive circuit module is used for converting the temperature of sunlight irradiated on the temperature-sensitive circuit module into a voltage signal and sending the voltage signal to a communication system; which are respectively connected with a communication system and a central control system;
the communication system is used for receiving the voltage signal transmitted by the thermosensitive circuit module, converting the voltage signal into a digital signal and transmitting the digital signal to the automatic control system and the central control system respectively; which is respectively connected with the thermosensitive circuit module, the automatic control system and the central control system;
the automatic control system is used for receiving the digital signal sent by the communication system, regulating and controlling the driving device in real time by using the digital signal, and regulating and controlling the position posture of the slot heliostat in real time by using the driving device; the system is respectively connected with a communication system, a driving device and a central control system;
the central control system is used for receiving the digital signals sent by the communication system, receiving feedback signals of the driving device, the automatic control system and the thermosensitive circuit module, and monitoring the motion condition of the driving device, the position posture of the slot heliostat and the real-time working state of the thermosensitive circuit module in real time; which are respectively connected with the driving device, the communication system, the automatic control system and the thermosensitive circuit module.
Optionally, the two thermosensitive circuit modules are both arranged on the heat absorber; the distance between the two thermosensitive circuit modules does not exceed 30mm, and the central position of the connecting line of the two thermosensitive circuit modules is positioned at the focus.
Optionally, the drive device is provided with a rotational damper for buffering acceleration or deceleration during the execution of the drive device, and reducing the motion amplitude of the whole drive device during the automatic sun tracking of the trough heliostat.
Optionally, the thermosensitive circuit module adopts a high-temperature NTC platinum resistor; and reflective materials are coated on the outer surface of the thermosensitive circuit module.
A trough mirror field automatic sun tracking control method is applied to a heat collection system and comprises the following steps:
step S01: the method for establishing the automatic sun tracking control system of the slot mirror field comprises the following steps: the system comprises a plurality of driving devices, two thermosensitive circuit modules, a communication system, an automatic control system and a central control system; wherein:
the driving device is used for providing driving force for the trough type heliostat field, is respectively connected with the automatic control system and the central control system, and receives a control instruction of the automatic control system/the central control system; the driving device is driven by hydraulic pressure and is supplied with oil through an oil pump;
the temperature-sensitive circuit module is used for converting the temperature of sunlight irradiated on the temperature-sensitive circuit module into a voltage signal and sending the voltage signal to a communication system; it is connected with communication system and central control system separately;
the communication system is used for receiving the voltage signal transmitted by the thermosensitive circuit module, converting the voltage signal into a digital signal and transmitting the digital signal to the automatic control system and the central control system respectively; which is respectively connected with the thermosensitive circuit module, the automatic control system and the central control system;
the automatic control system is used for receiving the digital signal sent by the communication system, regulating and controlling the driving device in real time by using the digital signal, and regulating and controlling the position posture of the slot type heliostat field in real time through the driving device; the system is respectively connected with a communication system, a driving device and a central control system;
the central control system is used for receiving the digital signals sent by the communication system, receiving feedback signals of the driving device, the automatic control system and the thermosensitive circuit module, and monitoring the motion condition of the driving device, the position posture of the slot heliostat and the real-time working state of the thermosensitive circuit module in real time; the automatic control system is respectively connected with the driving device, the communication system, the automatic control system and the thermosensitive circuit module;
step S02: when the heat collection system is started, the automatic control system calculates the offset direction of the heliostat in the current state according to a position calculation formula at the moment, the heliostat moves in the opposite direction, and the heliostat enters an automatic focusing mode; the position calculation formula is as follows:
cosθ＝sinδ*(sinψ*cosβ-cosψ*sinβ*cosγ)+
cosδ*cosω*(cosψ*cosβ+sinψ*sinβ*cosγ)+
cosδ*sinγ*sinβ*sinω
in the formula, theta is an incident angle, delta is a declination angle, beta is an inclination angle, psi is a dimensionality, omega is a time angle, and gamma is a solar azimuth angle;
step S03: when any one of the two thermosensitive circuit modules is influenced by illumination, the reflection light of the heliostat reaches the vicinity of a focus, the driving device reduces the rotating speed of the oil pump, and the moving speed of the heliostat is reduced;
step S04: when signals of two thermosensitive circuit modules of the heliostat change, reflected light of the heliostat contacts the heat absorber, the automatic focusing mode is exited, and the position of the heliostat is regulated and controlled by the thermosensitive circuit modules;
step S05: voltage signals sent by the two thermosensitive circuit modules are sent to a communication system, the communication system completes conversion from analog signals to digital signals and then sends the digital signals to an automatic control system and a central control system respectively, the central control system monitors the sent digital signals, the automatic control system controls a driving device to regulate and control the position posture of the trough type heliostat until the two thermosensitive resistance signals are the same, and the trough type heliostat stops moving;
step S06: and repeating the step S03, and enabling the trough type heat collecting system to enter an automatic sun tracking mode.
Optionally, the two thermosensitive circuit modules are both arranged on the heat absorber; the distance between the two thermosensitive circuit modules is not more than 30mm, and the center position of a connecting line of the two thermosensitive circuit modules is positioned at a focus.
Optionally, the drive device is provided with a rotational damper for buffering acceleration or deceleration during the execution of the drive device, and reducing the motion amplitude of the whole drive device during the automatic sun tracking of the trough heliostat.
Optionally, the thermosensitive circuit module adopts a high-temperature NTC platinum resistor; and reflective materials are coated on the outer surface of the thermosensitive circuit module.
Compared with the prior art, the invention has the following beneficial effects:
the automatic sun tracking control system of the groove type heat collecting system is controlled by a position calculation formula when being opened, and is regulated and controlled by temperature in real time during operation, mechanical damping can increase resistance of the hydraulic mechanism in the automatic sun tracking process, so that the hydraulic mechanism rotates near a focus at a lower speed, the automatic sun tracking precision is improved, the response time is short, and complicated operation and data storage are not needed, so that the equipment load is smaller, and more efficient power generation and lower cost input are facilitated.
The automatic sun tracking control system of the heat collection system is regulated and controlled by the central control system, on one hand, the contact type temperature sensor can monitor whether the surface temperature of the heat absorber is over-temperature, on the other hand, all operation data can be fed back, emergency situations in operation can be dealt with more, and the solar heat collector is worthy of being widely applied and popularized.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural diagram of an automatic sun tracking control system of a trough heliostat field according to an embodiment of the invention;
FIG. 2 is a front and top view of a drive assembly according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a thermal circuit module according to an embodiment of the present invention;
fig. 4 is a flowchart of an automatic sun tracking control method for a heliostat field in a trough type according to an embodiment of the invention. .
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the invention.
Referring to fig. 1, the embodiment discloses an automatic sun tracking control system for a trough heliostat field, which is applied to a heat collection system and comprises a plurality of driving devices, two thermosensitive circuit modules, a communication system, an automatic control system and a central control system; wherein:
the driving device is used for providing driving force for the trough type heliostat field, is respectively connected with the automatic control system and the central control system, receives a control instruction of the automatic control system/the central control system, and feeds back a signal to the central control system;
the temperature-sensitive circuit module is used for converting the temperature of sunlight irradiated on the temperature-sensitive circuit module into a voltage signal and sending the voltage signal to the communication system and the central control system; which are respectively connected with a communication system and a central control system; the temperature signal is directly transmitted to a central control system for monitoring the surface temperature of the heat absorber and serving as a monitoring and protecting facility for the safe operation of the heat absorber.
The communication system is used for receiving the voltage signal transmitted by the thermosensitive circuit module, converting the voltage signal into a digital signal and transmitting the digital signal to the automatic control system and the central control system respectively; which is respectively connected with the thermosensitive circuit module, the automatic control system and the central control system;
the automatic control system is used for receiving the digital signal sent by the communication system, regulating and controlling the driving device in real time by using the digital signal, and regulating and controlling the position posture of the slot heliostat in real time by using the driving device; the system is respectively connected with a communication system, a driving device and a central control system;
the central control system is used for receiving the digital signals sent by the communication system, receiving feedback signals of the driving device, the automatic control system and the thermosensitive circuit module, and monitoring the motion condition of the driving device, the position posture of the slot heliostat and the real-time working state of the thermosensitive circuit module in real time; which are respectively connected with the driving device, the communication system, the automatic control system and the thermosensitive circuit module.
The two thermosensitive circuit modules are arranged on the heat absorber; the distance between the two thermosensitive circuit modules is not more than 30mm (determined by the diameter of a heat absorber of the groove type mirror field), and the central position of the connecting line of the two thermosensitive circuit modules is positioned at a focus.
As shown in fig. 2, the driving device is a bottom-layer actuator of an automatic control system/central control system, and the driving device includes: the device comprises a mechanical supporting seat 1, a hydraulic cylinder 2, an output shaft 3, a double-lug connecting block 4, a supporting seat cover 5 and a rotary damper 6;
the hydraulic cylinder and the output shaft are both arranged on the mechanical support seat; the double-lug connecting block is connected with the hydraulic cylinder and the output shaft; the support seat cover is arranged above the output shaft; the rotary damper is arranged on one side of the mechanical support seat. The rotary damper is used for accelerating or decelerating and buffering in the execution process of the driving device, and reduces the motion amplitude of the whole driving device in the automatic sun tracking process of the trough heliostat.
A groove type heliostat field is driven by a plurality of driving devices, and due to the requirement on the movement precision of the device, each driving device adopts a parallel mechanism, is supplied with oil by an oil pump and is regulated and controlled by signals of a thermal sensitive circuit together. The stroke of the driving device is set to be 180 degrees, the rotary damper provides reverse torque, under the automatic sun tracking state, the requirement on the hydraulic adjustment amplitude near the focus is small, the accuracy of the position of the groove type heliostat in the hydraulic rotation process is guaranteed, the rotary damper plays the role of reducing the speed in the whole automatic sun tracking process so as to reduce the motion amplitude, the acceleration and deceleration stages existing in the adjustment are specifically shown, the impact on a hydraulic rotation system caused by emergency starting and emergency stopping is weakened, and the service life of a mechanical component is prolonged.
As shown in fig. 3, the thermal circuit module includes: the heat collecting device comprises a mechanical support and a thermosensitive circuit, wherein the mechanical support is respectively provided with an outer heat insulating layer 10, a mechanical shell 20, an inner heat insulating layer 30 and a heat collecting pipe cavity 40 from outside to inside; the thermal circuit is a bridge circuit consisting of a platinum resistor 50 and three fixed value resistors (the thermal circuit is prior art in the field and will not be described here again).
The thermosensitive circuit module adopts a high-temperature NTC platinum resistor; the outer surface of the thermosensitive circuit module is coated with a reflective material, so that overhigh temperature of a mechanical structure and aging of circuit lines are prevented, and other circuit elements are not exposed except a mechanical shell.
The communication system is characterized in that the singlechip is used for converting an analog signal into a digital signal, and the digital signal directly drives the driving device (through the automatic control system) on one hand and feeds back the signal to the central control system for data monitoring on the other hand.
The central control system comprises a circuit signal feedback module, a hydraulic position feedback module and a hydraulic drive control module; wherein:
the circuit signal feedback module is used for monitoring the real-time current data of the thermosensitive circuit module and judging the working state of the thermosensitive circuit module;
the hydraulic position feedback module is used for monitoring the position posture of the heliostat in the current state;
and the hydraulic drive control module is used for controlling the attitude of the heliostat and ensuring the safety of system equipment.
As shown in fig. 4, this embodiment also discloses a trough mirror field automatic sun tracking control method, which is applied in a heat collecting system and includes the following steps:
step S01: the method for establishing the automatic sun tracking control system of the slot mirror field comprises the following steps: the system comprises a plurality of driving devices, two thermosensitive circuit modules, a communication system, an automatic control system and a central control system; wherein:
the driving device is used for providing driving force for the trough type heliostat field, is respectively connected with the automatic control system and the central control system, and receives a control instruction of the automatic control system/the central control system; the driving device is driven by hydraulic pressure and is supplied with oil through an oil pump;
the temperature-sensitive circuit module is used for converting the temperature of sunlight irradiated on the temperature-sensitive circuit module into a voltage signal and sending the voltage signal to a communication system; which are respectively connected with a communication system and a central control system;
the communication system is used for receiving the voltage signal transmitted by the thermosensitive circuit module, converting the voltage signal into a digital signal and transmitting the digital signal to the automatic control system and the central control system respectively; which is respectively connected with the thermosensitive circuit module, the automatic control system and the central control system;
the automatic control system is used for receiving the digital signal sent by the communication system, regulating and controlling the driving device in real time by using the digital signal, and regulating and controlling the position posture of the slot type heliostat field in real time through the driving device; the system is respectively connected with a communication system, a driving device and a central control system;
the central control system is used for receiving the digital signals sent by the communication system, receiving feedback signals of the driving device, the automatic control system and the thermosensitive circuit module, and monitoring the motion condition of the driving device, the position posture of the slot heliostat and the real-time working state of the thermosensitive circuit module in real time; which are respectively connected with the driving device, the communication system, the automatic control system and the thermosensitive circuit module. (ii) a
Step S02: when the heat collection system is started, the automatic control system calculates the offset direction of the heliostat in the current state according to a position calculation formula at the moment, the heliostat moves in the opposite direction, and the heliostat enters an automatic focusing mode; the position calculation formula is as follows:
cosθ＝sinδ*(siψ*cosβ-cosψ*sinβ*cosγ)+
cosδ*cosω*(cosψ*cosβ+sinψ*sinβ*cosγ)+
cosδ*sinγ*sinβ*sinω
in the formula, theta is an incident angle, delta is a declination angle, beta is an inclination angle, psi is a dimensionality, omega is a time angle, and gamma is a solar azimuth angle; given geographic latitude and field opening date and time of a mirror field, the size of the dip angle under the condition that the incident angle is theta can be calculated;
step S03: when any one of the two thermosensitive circuit modules is influenced by illumination, the reflection light of the heliostat reaches the vicinity of a focus, the driving device reduces the rotating speed of the oil pump, and the moving speed of the heliostat is reduced; wherein the counter torque is provided by a rotary damper;
step S04: when signals of two thermosensitive circuit modules of the heliostat change, reflected light of the heliostat contacts the heat absorber, the automatic focusing mode is exited, and the position of the heliostat is regulated and controlled by the thermosensitive circuit modules;
step S05: voltage signals sent by the two thermosensitive circuit modules are sent to a communication system, the communication system completes conversion from analog signals to digital signals and then sends the digital signals to an automatic control system and a central control system respectively, the central control system monitors the sent digital signals, the automatic control system controls a driving device to regulate and control the position posture of the slot-type heliostat until the two thermosensitive resistance signals are the same, and the slot-type heliostat stops moving;
step S06: and S03, repeating the step, and enabling the groove type heat collecting system to enter an automatic sun tracking mode.
The two thermosensitive circuit modules are arranged on the heat absorber; the distance between the two thermosensitive circuit modules is not more than 30mm (determined by the diameter of a heat absorber of the groove type mirror field), and the central position of the connecting line of the two thermosensitive circuit modules is positioned at a focus.
As shown in fig. 2, the driving device is a bottom-layer actuator of an automatic control system/central control system, and the driving device includes: mechanical supporting seat 1, pneumatic cylinder 2, output shaft 3, binaural connecting block 4, supporting seat lid 5, rotary damper 6.
The hydraulic cylinder and the output shaft are both arranged on the mechanical support seat; the double-lug connecting block is connected with the hydraulic cylinder and the output shaft; the support seat cover is arranged above the output shaft; the rotary damper is arranged on one side of the mechanical support seat and is fixed on the output shaft. The rotary damper is used for accelerating or decelerating and buffering in the execution process of the driving device, and reduces the motion amplitude of the whole driving device in the automatic sun tracking process of the trough heliostat.
As shown in fig. 3, the thermosensitive circuit module includes: the heat collecting device comprises a mechanical support and a thermosensitive circuit, wherein the mechanical support is respectively provided with an outer heat insulating layer 10, a mechanical shell 20, an inner heat insulating layer 30 and a heat collecting pipe cavity 40 from outside to inside; the thermistor circuit is a bridge circuit consisting of a platinum resistor 50 and three fixed resistors (thermistor circuit is prior art in the field and will not be described here in detail).
The thermosensitive circuit module adopts a high-temperature NTC platinum resistor; the outer surface of the thermosensitive circuit module is coated with a reflective material, so that overhigh temperature of a mechanical structure and aging of circuit lines are prevented, and other circuit elements are not exposed except a mechanical shell.
The communication system is characterized in that the singlechip is used for converting an analog signal into a digital signal, and the digital signal directly drives the driving device (through the automatic control system) on one hand and feeds back the signal to the central control system for data monitoring on the other hand.
The central control system comprises a circuit signal feedback module, a hydraulic position feedback module and a hydraulic drive control module; wherein:
the circuit signal feedback module is used for monitoring the real-time current data of the thermosensitive circuit module and judging the working state of the thermosensitive circuit module;
the hydraulic position feedback module is used for monitoring the position posture of the heliostat under the current state;
and the hydraulic drive control module is used for controlling the attitude of the heliostat and ensuring the safety of system equipment.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (8)
1. The utility model provides an automatic control system that follows after a day of trough type heliostat field, is applied to among the heating system which characterized in that: the system comprises a plurality of driving devices, two thermosensitive circuit modules, a communication system, an automatic control system and a central control system; wherein:
the driving device is used for providing driving force for the trough type heliostat field, is respectively connected with the automatic control system and the central control system, and receives a control instruction of the automatic control system/the central control system;
the temperature-sensitive circuit module is used for converting the temperature of the sunlight irradiated on the temperature-sensitive circuit module into a voltage signal and sending the voltage signal to the communication system; it is connected with communication system and central control system separately; the number of the thermosensitive circuit modules is two, voltage signals sent by the two thermosensitive circuit modules are sent to a communication system, the communication system completes conversion from analog signals to digital signals, then the digital signals are sent to an automatic control system and a central control system respectively, the central control system monitors the sent digital signals, the automatic control system controls a driving device to regulate and control the position posture of the slot-type heliostat until the two thermosensitive resistance signals are the same, and the slot-type heliostat stops moving;
the communication system is used for receiving the voltage signal transmitted by the thermosensitive circuit module, converting the voltage signal into a digital signal and transmitting the digital signal to the automatic control system and the central control system respectively; the automatic control system is respectively connected with the thermosensitive circuit module, the automatic control system and the central control system;
the automatic control system is used for receiving the digital signal sent by the communication system, regulating and controlling the driving device in real time by using the digital signal, and regulating and controlling the position posture of the slot heliostat in real time by using the driving device; the system is respectively connected with a communication system, a driving device and a central control system;
the central control system is used for receiving the digital signals sent by the communication system, receiving feedback signals of the driving device, the automatic control system and the thermosensitive circuit module, and monitoring the motion condition of the driving device, the position posture of the slot heliostat and the real-time working state of the thermosensitive circuit module in real time; which are respectively connected with the driving device, the communication system, the automatic control system and the thermosensitive circuit module.
2. The system of claim 1, wherein: the two thermosensitive circuit modules are arranged on the heat absorber; the distance between the two thermosensitive circuit modules is not more than 30mm, and the center position of a connecting line of the two thermosensitive circuit modules is positioned at a focus.
3. The system of claim 1, wherein: the driving device is provided with a rotary damper for buffering acceleration or deceleration in the execution process of the driving device, and the motion amplitude of the whole driving device is reduced in the automatic sun tracking process of the trough heliostat.
4. The system of claim 1, wherein: the thermosensitive circuit module adopts a high-temperature NTC platinum resistor; and reflective materials are coated on the outer surface of the thermosensitive circuit module.
5. A trough heliostat field automatic sun-tracking control method is applied to a heat collection system and is characterized by comprising the following steps:
step S01: the method for establishing the automatic sun tracking control system of the slot mirror field comprises the following steps: the system comprises a plurality of driving devices, two thermosensitive circuit modules, a communication system, an automatic control system and a central control system; wherein:
the driving device is used for providing driving force for the trough type heliostat field, is respectively connected with the automatic control system and the central control system, and receives a control instruction of the automatic control system/the central control system; the driving device is driven by hydraulic pressure and is supplied with oil through an oil pump;
the temperature-sensitive circuit module is used for converting the temperature of sunlight irradiated on the temperature-sensitive circuit module into a voltage signal and sending the voltage signal to a communication system; which are respectively connected with a communication system and a central control system;
the communication system is used for receiving the voltage signal transmitted by the thermosensitive circuit module, converting the voltage signal into a digital signal and transmitting the digital signal to the automatic control system and the central control system respectively; which is respectively connected with the thermosensitive circuit module, the automatic control system and the central control system;
the automatic control system is used for receiving the digital signal sent by the communication system, regulating and controlling the driving device in real time by using the digital signal, and regulating and controlling the position posture of the slot type heliostat field in real time through the driving device; the system is respectively connected with a communication system, a driving device and a central control system;
the central control system is used for receiving the digital signals sent by the communication system, receiving feedback signals of the driving device, the automatic control system and the thermosensitive circuit module, and monitoring the motion condition of the driving device, the position posture of the slot heliostat and the real-time working state of the thermosensitive circuit module in real time; the automatic control system is respectively connected with the driving device, the communication system, the automatic control system and the thermosensitive circuit module;
step S02: when the heat collection system is started, the automatic control system calculates the offset direction of the heliostat in the current state according to a position calculation formula at the moment, the heliostat moves in the opposite direction, and the heliostat enters an automatic focusing mode; the position calculation formula is as follows:
cosθ＝sinδ*(sinψ*cosβ-cosψ*sinβ*cosγ)+
cosδ*cosω*(cosψ*cosβ+sinψ*sinβ*cosγ)+
cosδ*sinγ*sinβ*sinω
in the formula, theta is an incident angle, delta is a declination angle, beta is an inclination angle, psi is a dimensionality, omega is a time angle, and gamma is a solar azimuth angle;
step S03: when any one of the two thermosensitive circuit modules is influenced by illumination, the reflection light of the heliostat reaches the vicinity of a focus, the driving device reduces the rotating speed of the oil pump, and the moving speed of the heliostat is reduced;
step S04: when signals of two thermosensitive circuit modules of the heliostat change, reflected light of the heliostat contacts the heat absorber, the automatic focusing mode is exited, and the position of the heliostat is regulated and controlled by the thermosensitive circuit modules;
step S05: voltage signals sent by the two thermosensitive circuit modules are sent to a communication system, the communication system completes conversion from analog signals to digital signals and then sends the digital signals to an automatic control system and a central control system respectively, the central control system monitors the sent digital signals, the automatic control system controls a driving device to regulate and control the position posture of the slot-type heliostat until the two thermosensitive resistance signals are the same, and the slot-type heliostat stops moving;
step S06: and S03, repeating the step, and enabling the groove type heat collecting system to enter an automatic sun tracking mode.
6. The method for controlling automatic sun tracking of a heliostat field of claim 5, wherein: the two thermosensitive circuit modules are arranged on the heat absorber; the distance between the two thermosensitive circuit modules does not exceed 30mm, and the central position of the connecting line of the two thermosensitive circuit modules is positioned at the focus.
7. The method according to claim 5, wherein the method comprises: the driving device is provided with a rotary damper for buffering acceleration or deceleration in the execution process of the driving device, and the motion amplitude of the whole driving device is reduced in the automatic sun tracking process of the trough heliostat.
8. The method according to claim 5, wherein the method comprises: the thermosensitive circuit module adopts a high-temperature NTC platinum resistor; and reflective materials are coated on the outer surface of the thermosensitive circuit module.
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