CN117663502A - System and method for calibrating thermoelectric combined output of tower type photo-thermal power station - Google Patents
System and method for calibrating thermoelectric combined output of tower type photo-thermal power station Download PDFInfo
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- CN117663502A CN117663502A CN202311667440.8A CN202311667440A CN117663502A CN 117663502 A CN117663502 A CN 117663502A CN 202311667440 A CN202311667440 A CN 202311667440A CN 117663502 A CN117663502 A CN 117663502A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000010248 power generation Methods 0.000 claims abstract description 28
- 239000006096 absorbing agent Substances 0.000 claims description 15
- 230000005611 electricity Effects 0.000 abstract description 4
- 150000003839 salts Chemical class 0.000 description 15
- 239000002131 composite material Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 3
- 239000008358 core component Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
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- 230000002269 spontaneous effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
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Abstract
The invention relates to the technical field of photovoltaic power generation, in particular to a system and a method for calibrating thermoelectric combined output of a tower type photo-thermal power station. The invention can recycle the facula area of the standby light source, and further obtains the photovoltaic power generation electric energy by using the photovoltaic power generation mode to carry out the related system equipment design, and the partial electric energy can be used for the electric tracing function to further reduce the field electricity consumption of the photo-thermal power station. The equipment can also check the attitude and the fault rate of the heliostat, and can check the fault condition of the heliostat of the photo-thermal power station as soon as possible.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a system and a method for calibrating thermoelectric combined output of a tower type photo-thermal power station.
Background
Molten salt in a tower power station is the most widely used heat storage medium for photo-thermal power stations, and is also becoming a great trend as a heat transfer medium. However, the higher solidification point of the molten salt brings about some difficulties for the operation of the photo-thermal power station. Once the temperature is lower than the solidification point of molten salt, the pipeline is extremely easy to be frozen and blocked, and even the whole system is paralyzed. In order to ensure safe and stable operation of the photo-thermal power station, equipment for circulating molten salt media such as a storage tank, a pipeline, a valve, a heat exchanger and the like is generally additionally provided with an electric tracing and heating device. Especially in winter, maintaining the system molten salt at a higher working temperature becomes the main consumption of electricity for the photo-thermal power station, and therefore, the system efficiency of the photo-thermal power station is further reduced, and the system efficiency of photo-thermal is only about 20% at present.
A tower power station is generally divided into 5 modules: mirror field, receiving, converting (salt changes into gas), storing and generating power. But each sub-system is subdivided into a number of small modules. In a tower solar photo-thermal power plant, a mirror field (heliostat) is a core component that functions to track sunlight and accurately reflect the sunlight onto a heat absorber. The heliostat system includes a mirror, a support, and a drive. The support plays a role in fixing and supporting the reflecting mirror, and is important equipment for guaranteeing accurate sun tracking of the heliostat system. The acceptance (heat absorber) is also one of important equipment of a power station, and directly converts solar energy captured, reflected and focused by heliostats into high-temperature heat energy which can be efficiently utilized, and provides a required heat source or power source for a generator set, so that the solar thermal power generation process is realized.
The prior art has the following problems:
1) The cost of the spare light source is high. As a core component of a tower solar photo-thermal power plant, heliostats function to reflect sunlight striking its surface to a target absorber region. Because the sun constantly changes position along with time, so heliostat need possess sufficient control accuracy in order to guarantee that the directional precision of reflected light satisfies the design requirement, promptly that the solar energy that reflects through heliostat can constantly, accurately shine to target absorber region to guarantee the collection efficiency of absorber region solar energy and solar photo-thermal power station's work efficiency. In normal operation, the heliostat needs to wait for a part of light sources for standby preparation of fluctuation of the photo-thermal power station, and the part of light sources form a light spot area above the tower-type photo-thermal power station, and the light spot area is light pollution to the nature even though light resources of the photo-thermal power station are wasted.
2) Real-time feedback is not available. The existing open loop control method relies on a motion model to estimate operation information of the heliostat and performs unidirectional control on the heliostat based on sequential action, namely the heliostat only rotates according to an estimated operation table in the actual rotation process, and cannot feed back the accuracy of the actual attitude of the heliostat, so that the heliostat has no automatic deviation rectifying capability. Because the motion model is an abstract induction of the actual running situation of the heliostat, the obtained estimated result is only close to the actual situation and cannot fully represent the actual situation, and therefore the gesture of the heliostat controlled based on the motion model has a certain deviation from the gesture of an actual target. Because of no real-time feedback, heliostats cannot handle some abnormal conditions, such as non-idealities that cannot be corrected by a model, surface shape changes caused by wind, and the like, in a partial area of a travel range.
Disclosure of Invention
The invention provides a system and a method for calibrating the thermoelectric combined output of a tower type photo-thermal power station.
A system for combined thermoelectric power calibration of a tower-type photo-thermal power station, comprising:
a plurality of photovoltaic modules for calibration are uniformly and circumferentially arranged on one side, close to the tower top, of the tower body of the tower type photo-thermal power station; the heliostat adjusts the angle according to the output of the photovoltaic module.
Further, a tower absorber is arranged at the tower top of the tower type photo-thermal power station; the tower type heat absorber is provided with a large-area photovoltaic module for photovoltaic power generation.
Further, the heliostat adjusts an angle according to an output of the photovoltaic module, including:
each photovoltaic module is sequentially connected with an IV tester and is unified and summarized to an analysis terminal through a micro inverter;
the heliostat base is provided with a fine adjustment device, and the fine adjustment device is used for adjusting the angle of the heliostat according to feedback output by the analysis terminal to the photovoltaic module.
Further, the angles of the heliostats are adjusted one by one according to the output of the photovoltaic module 3, so that the posture of each heliostat is overhauled and calibrated.
A method for calibrating the thermoelectric combined output of a tower type photo-thermal power station adopts the system for calibrating the thermoelectric combined output of the tower type photo-thermal power station to calibrate the thermoelectric combined output of the tower type photo-thermal power station.
The invention has at least the following beneficial effects:
the invention can recycle the facula area of the standby light source, and further obtains the photovoltaic power generation electric energy by using the photovoltaic power generation mode to carry out the related system equipment design, and the partial electric energy can be used for the electric tracing function to further reduce the field electricity consumption of the photo-thermal power station. The equipment can also check the attitude and the fault rate of the heliostat, and can check the fault condition of the heliostat of the photo-thermal power station as soon as possible.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a system for combined heat and power output calibration of a tower type photo-thermal power station;
FIG. 2 is a schematic diagram of a calibration system connection.
In the drawing, 1 is a large-area photovoltaic module; 2 is a tower type heat absorber; 3 is a photovoltaic module; 4 is a tower body; and 5 is a heliostat.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention relates to a photovoltaic and photo-thermal composite power supply device, which can utilize a standby control mirror to perform photovoltaic power generation and composite power generation at the same time of photo-thermal power generation. In order to ensure safe and stable operation of the photo-thermal power station, equipment for circulating molten salt media such as a storage tank, a pipeline, a valve, a heat exchanger and the like is generally additionally provided with an electric tracing and heating device. The device performs photovoltaic power generation by utilizing the standby electric quantity of the photo-thermal power station, and further rapidly obtains electric energy to form photovoltaic photo-thermal combined output in the power station.
A system for combined thermoelectric power calibration of a tower-type photo-thermal power station, comprising:
a plurality of photovoltaic modules 3 used for calibration are uniformly and circumferentially arranged on one side, close to the tower top, of a tower body 4 of the tower type photo-thermal power station; the heliostat 5 adjusts the angle according to the output of the photovoltaic module 3.
In one embodiment, the tower top of the tower type photo-thermal power station is provided with a tower type heat absorber 2; the tower-type heat absorber 2 is provided with a large-area photovoltaic module 1 for photovoltaic power generation.
In one embodiment, the heliostat 5 adjusts an angle according to the output of the photovoltaic module 3, including:
each photovoltaic module 3 is sequentially connected with an IV tester and is unified and summarized to an analysis terminal through a micro inverter;
the heliostat 5 base is provided with micromatic setting, and micromatic setting is used for adjusting heliostat 5 angle according to the feedback that analysis terminal outputted to photovoltaic module 3.
In an embodiment, the angles of the heliostats 5 are adjusted one by one according to the output of the photovoltaic module 3, so as to overhaul the posture of each heliostat 5.
A method for calibrating thermoelectric combined output of a tower type photo-thermal power station,
by adopting the system for calibrating the combined heat and power output of the tower type photo-thermal power station, the combined heat and power output of the tower type photo-thermal power station is calibrated.
In order for those skilled in the art to better understand the present invention, the principles of the present invention are described below with reference to the accompanying drawings:
the tower height of the existing large-scale tower type photovoltaic power station is between 200 and 300m, the high tower can more effectively concentrate sunlight heat energy, a heat absorber is arranged at the tower top, molten salt circulation is adopted by the heat absorber, the molten salt is heated to 565 ℃ from 290 ℃, the heat of high-temperature molten salt is brought to a steam generator, and the molten salt is reheated through a molten salt circulation system after losing the heat; in addition, the steam circulation system is also used for generating high-temperature and high-pressure steam at the steam generator to drive the turbine generator, and cooling steam is recycled for heating.
The design of the heat absorber requires that the inlet temperature of molten salt is 290 ℃ and the outlet temperature is 565 ℃; if the sky is cloudy, when the outlet temperature can not meet the requirement, the method for changing the flow of the molten salt is used for solving the problem, and the required outlet temperature is always kept, so that the molten salt has low melting point temperature (220 ℃) and high gasification temperature (600 ℃), and the tower type power generation has great progress. The temperature and the flow rate of lava are accurately controlled, so that the tower type photovoltaic power station stably generates power in actual work, reserves a standby light source, forms a huge light spot in the air, and the part of light source does not generate power and is mainly used for adjusting the stability of the light source.
The invention provides a thermoelectric combined output calibration system which can utilize a standby light source to generate power and calibrate heliostats 5 of a photovoltaic power station.
The core point of the invention is to add the large-area photovoltaic module 1 and the photovoltaic module 3 in fig. 1, so that the surplus light source can generate electricity through the photovoltaic module 3 to form the co-production of photovoltaic light and heat. The heliostat 5 can irradiate the same mirror on the large-area photovoltaic module 1 or the photovoltaic module 3 through precise adjustment, and the light energy corresponding to the mirror is obtained through irradiation so as to generate power.
The large-area photovoltaic module 1 in fig. 1 performs photovoltaic power generation through the large-area photovoltaic module 3 to obtain concentrated electric energy and store the concentrated electric energy.
The assembly clusters of photovoltaic assemblies 3 of fig. 1 may be calibrated for the corresponding heliostats 5. As shown in fig. 2, by using the calibration mode of IV output power, the mirror is quickly self-adjusted to obtain the maximum IV data, so as to obtain accurate positioning data points, and further, the attitude adjustment of the heliostat 5 is further performed, so as to obtain better accurate control.
The invention relates to a photovoltaic and photo-thermal composite power supply device, which can utilize a standby control mirror to perform photovoltaic power generation and composite power generation at the same time of photo-thermal power generation. The invention can complete the calibration of the photo-thermal heliostat 5 on the basis of simultaneously carrying out photovoltaic photo-thermal power generation, solves the hysteresis and open loop of the calibration of the heliostat 5 at present, and carries out the calibration rapidly. The invention can ensure the electric energy source problem of the high-energy consumption and high-electricity consumption unit of electric tracing by storing through photovoltaic configuration, and forms a spontaneous self-use system with definite load. The invention mainly utilizes the light energy of the standby control mirror by constructing a large-area power generation device, the form of the power generation device is not limited, and the main idea is that the power generation device is built on equipment outside the tower body. The invention utilizes the IV characteristic of the photovoltaic and the capture of MPPT to calibrate the heliostat 5, can be widely applied to various formulas of the heliostat 5, and can perform quick feedback. However, the arrangement of the components of the tower body may be various, and if the calibration function is omitted, the photovoltaic modules 3 may be completely laid out.
The invention relates to a photovoltaic and photo-thermal composite power supply device, which can utilize a standby control mirror to perform photovoltaic power generation and composite power generation at the same time of photo-thermal power generation. The invention can complete the calibration of the photo-thermal heliostat 5 on the basis of simultaneously carrying out photovoltaic photo-thermal power generation, solves the hysteresis and open loop of the calibration of the heliostat 5 at present, and carries out the calibration rapidly. The invention can ensure the electric energy source problem of the high-energy consumption and high-electricity consumption unit of electric tracing by storing through photovoltaic configuration, and forms a spontaneous self-use system with definite load.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A system for combined thermoelectric power generation and calibration of a tower-type photo-thermal power plant, comprising:
a plurality of photovoltaic modules (3) for calibration are uniformly arranged around one side, close to the tower top, of a tower body (4) of the tower type photo-thermal power station; the heliostat (5) adjusts the angle according to the output of the photovoltaic module (3).
2. A system for calibrating combined heat and power output of a tower type photo-thermal power station according to claim 1, wherein,
a tower absorber (2) is arranged at the tower top of the tower type photo-thermal power station; the tower type heat absorber (2) is provided with a large-area photovoltaic module (1) for photovoltaic power generation.
3. A system for calibrating combined heat and power output of a tower type photo-thermal power station according to claim 1, wherein,
heliostat (5) adjusts the angle according to the output of photovoltaic module (3), comprising:
each photovoltaic module (3) is sequentially connected with an IV tester and is unified and summarized to an analysis terminal through a micro inverter;
the heliostat (5) base is provided with a fine tuning device, and the fine tuning device is used for adjusting the angle of the heliostat (5) according to feedback output by the analysis terminal to the photovoltaic module (3).
4. A system for calibrating combined heat and power output of a tower type photo-thermal power station according to claim 1, wherein,
and adjusting angles of the heliostats (5) one by one according to the output of the photovoltaic assembly (3) so as to overhaul the posture of each heliostat (5).
5. A method for calibrating the thermoelectric combined output of a tower type photo-thermal power station is characterized in that,
a system for calibrating the combined heat and power output of a tower type photo-thermal power station according to any one of claims 1-4, wherein the combined heat and power output of the tower type photo-thermal power station is calibrated.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311667440.8A CN117663502A (en) | 2023-12-06 | 2023-12-06 | System and method for calibrating thermoelectric combined output of tower type photo-thermal power station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311667440.8A CN117663502A (en) | 2023-12-06 | 2023-12-06 | System and method for calibrating thermoelectric combined output of tower type photo-thermal power station |
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| CN117663502A true CN117663502A (en) | 2024-03-08 |
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| CN202311667440.8A Pending CN117663502A (en) | 2023-12-06 | 2023-12-06 | System and method for calibrating thermoelectric combined output of tower type photo-thermal power station |
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- 2023-12-06 CN CN202311667440.8A patent/CN117663502A/en active Pending
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