CN112367044B - Control method of photovoltaic module cooling system and photovoltaic module cooling system - Google Patents
Control method of photovoltaic module cooling system and photovoltaic module cooling system Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000005507 spraying Methods 0.000 claims abstract description 162
- 238000001514 detection method Methods 0.000 claims abstract description 105
- 239000007921 spray Substances 0.000 claims abstract description 54
- 238000011217 control strategy Methods 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 56
- 238000005070 sampling Methods 0.000 claims description 28
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 230000007613 environmental effect Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 12
- 230000002035 prolonged effect Effects 0.000 abstract description 5
- 238000010248 power generation Methods 0.000 description 17
- 230000017525 heat dissipation Effects 0.000 description 9
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
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- 230000008878 coupling Effects 0.000 description 3
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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
- H02S40/42—Cooling means
- H02S40/425—Cooling means using a gaseous or a liquid coolant, e.g. air flow ventilation, water circulation
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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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
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Abstract
The invention discloses a control method of a photovoltaic module cooling system and the photovoltaic module cooling system. Photovoltaic module cooling system includes: temperature-detecting device and sprinkler, wherein, the control method includes: under the condition that the temperature detection device detects that the temperature of a photovoltaic panel of the photovoltaic assembly is higher than a first preset temperature, the spraying device is controlled to spray to the photovoltaic assembly; when the spraying time reaches a first preset time, controlling the spraying device to stop; after the spraying device stops, the spraying device is controlled through a preset control strategy, so that the temperature of a photovoltaic panel of the photovoltaic assembly is in a preset temperature range corresponding to the current irradiance. The problem of among the prior art photovoltaic module's the not good cooling effect is solved, photovoltaic module's generating efficiency has been improved. In addition, the rapid temperature rise and rapid temperature drop of the photovoltaic module in a short time are avoided, and the service life of the photovoltaic module is prolonged.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a control method of a photovoltaic module cooling system and the photovoltaic module cooling system.
Background
Because the power generation efficiency of the photovoltaic power generation system is very sensitive to the temperature of the photovoltaic module, when the temperature of the photovoltaic module rises, the output power of the photovoltaic module can be obviously reduced, for example, the temperature of the photovoltaic module rises by 1 ℃, and the conversion efficiency can be reduced by 0.4-0.5%. Therefore, it is necessary to cool the photovoltaic module and keep the temperature of the photovoltaic module at a low level to improve the conversion efficiency and output power of the photovoltaic module.
At present, the cooling method of the photovoltaic module mainly comprises two types of active cooling and passive cooling. The active cooling is to store the heat of the component by the heat storage device for recycling the heat energy, but the active cooling mode has the defects of low utilization rate of the heat storage device in non-strong lighting seasons and high equipment cost.
The passive cooling mode has multiple implementation mode, one kind is laid the water pipe at the photovoltaic board, gives the subassembly cooling through the circulating water cooling mode, but lays the required equipment of pipeline and is more complicated, for example need be equipped with equipment such as water-cooling tank, purifying box, requires highly and the practicality is relatively poor to the place. Another kind of passive cooling mode is the direct water-cooling in surface, cools down photovoltaic module through spraying or the mode of spraying promptly, when adopting the mode of spraying, need erect U type groove in photovoltaic module top, can appear overflowing the position of water and differ, the relatively poor problem of cooling effect. When adopting the mode of spraying, because current spraying strategy generally is simple timing spraying, lacks the pertinence, the same waste that causes the water resource of spraying strategy in different environment on the one hand, and on the other hand has the condition that sprays photovoltaic module temperature rise in the interval. In addition, the control signal of spraying the tactics comes from photovoltaic module backplate temperature, and the temperature of photovoltaic module backplate generally is less than subassembly surface temperature, and when high temperature environment, subassembly surface temperature rises very fast, detects the hysteresis that backplate temperature can cause the actual spraying, and the photovoltaic module surface has reached higher temperature when starting to spray, sprays this moment and can cause photovoltaic module surface temperature to descend rapidly, influences photovoltaic module life. In addition, in the prior art, a scheme that a control signal of a spraying strategy is derived from the surface temperature of the photovoltaic module also exists, but the detection of the surface temperature of the photovoltaic module generally needs to be detected by an infrared sensor, the accuracy of the temperature detection of the infrared sensor can be influenced by the precision of the sensor, and when the temperature of the photovoltaic module reaches a set threshold value, the photovoltaic module is already in a high-temperature working environment, so that the spraying is delayed. Therefore, the spraying cooling strategy based on temperature detection has the problem of spraying lag, for example, after a certain time of spraying, water drops and water films remain on the surface of the photovoltaic module, the evaporation process still takes away the surface heat of the photovoltaic module, the low temperature of the photovoltaic module is maintained, after the evaporation of the photovoltaic module is completed, the surface temperature of the module begins to rapidly rise to a high temperature threshold value, namely, the water drops and the photovoltaic water films on the surface of the photovoltaic module are completely evaporated, and the temperature of the module rises rapidly in the period from the temperature rise of the photovoltaic module to the high temperature, so that the power generation efficiency is low.
The problem of photovoltaic module's cooling effect is not good among the above-mentioned prior art, has not proposed effectual solution at present.
Disclosure of Invention
The embodiment of the invention provides a control method of a photovoltaic module cooling system and the photovoltaic module cooling system, which at least solve the technical problem of poor cooling effect on a photovoltaic module in the prior art.
According to an aspect of an embodiment of the present invention, there is provided a control method for a photovoltaic module cooling system, where the photovoltaic module cooling system includes: the device comprises a photovoltaic panel temperature detection device and a spraying device which are arranged on a photovoltaic module, wherein the control method comprises the following steps: under the condition that the temperature detection device detects that the temperature of a photovoltaic panel of the photovoltaic assembly is higher than a first preset temperature, the spraying device is controlled to spray to the photovoltaic assembly; when the spraying time reaches a first preset time, controlling the spraying device to stop; after the spraying device stops, the spraying device is controlled through a preset control strategy, so that the temperature of a photovoltaic plate of the photovoltaic assembly is in a preset temperature range corresponding to the current irradiance.
Further, photovoltaic module cooling system includes: set up in the humidity detection device on photovoltaic module surface, the aforesaid is controlled sprinkler through predetermined control strategy to make photovoltaic module's photovoltaic board temperature be in the preset temperature range that current irradiance corresponds, include: acquiring the humidity of the surface of the photovoltaic module detected by a humidity detection device; if the detection result shows that the humidity of the surface of the photovoltaic module is smaller than the preset humidity, the spraying device is controlled to spray the photovoltaic module for a second preset time, wherein the second preset time is smaller than the first preset time; and if the detection result shows that the humidity of the surface of the photovoltaic assembly is greater than or equal to the preset humidity, detecting the humidity of the surface of the photovoltaic assembly again after a preset sampling interval.
Further, after controlling the spraying device to spray to the photovoltaic module for a second preset time, the method further comprises: and detecting the humidity of the surface of the photovoltaic module again after a preset sampling interval.
Further, control sprinkler through predetermined control strategy to make photovoltaic module's photovoltaic board temperature be in the corresponding predetermined temperature range of current irradiance, include: obtaining the temperature of the photovoltaic panel of the photovoltaic module detected by the temperature detection device again; if the detection result shows that the temperature of the photovoltaic panel of the photovoltaic module is higher than a second preset temperature, the spraying device is controlled to spray the photovoltaic module for a third preset time, wherein the second preset temperature is lower than the first preset temperature, and the third preset time is shorter than the first preset time; and if the detection result shows that the temperature of the photovoltaic panel of the photovoltaic assembly is less than or equal to a second preset temperature, detecting the temperature of the photovoltaic panel of the photovoltaic assembly again after a preset sampling interval.
Further, after the spraying device is controlled to spray the photovoltaic module for a third preset time, the method further comprises the following steps: and detecting the temperature of the photovoltaic panel of the photovoltaic module again after a preset sampling interval.
Further, the method further comprises: acquiring a first preset temperature, wherein the step of acquiring the first preset temperature comprises the following steps: acquiring environmental parameters of the environment where the photovoltaic module is located; a first preset temperature is determined according to the environmental parameter.
Further, the method further comprises: shutting down the photovoltaic module cooling system under any one or more of the following conditions: the irradiance of the environment where the photovoltaic component is located is lower than the preset irradiance; the current time reaches the preset closing time; the conversion power of the photovoltaic module is larger than the first preset power.
Further, the method further comprises: starting the photovoltaic module cooling system under any one or more of the following conditions: the temperature of a photovoltaic plate of the photovoltaic module is higher than a third preset temperature, wherein the third preset temperature is higher than or equal to the first preset temperature; the current time reaches the preset starting time; the conversion power of the photovoltaic module is smaller than the second preset power.
According to another aspect of the embodiments of the present invention, there is also provided a photovoltaic module cooling system, including: the temperature detection device is arranged on a photovoltaic panel of the photovoltaic module and used for detecting the temperature of the photovoltaic panel of the photovoltaic module; the spraying device is used for spraying the photovoltaic module; the controller is connected with the temperature detection device and the spraying device and used for controlling the spraying device to spray to the photovoltaic assembly under the condition that the temperature of the photovoltaic panel of the photovoltaic assembly is detected by the temperature detection device to be higher than a first preset temperature, when the spraying time reaches the first preset time, the spraying device is controlled to stop, and after the spraying device stops, the spraying device is controlled through a preset control strategy, so that the temperature of the photovoltaic panel of the photovoltaic assembly is in a preset temperature range corresponding to the current irradiance.
Further, photovoltaic module cooling system includes: the humidity detection device is arranged on the surface of the photovoltaic module; the controller is also used for acquiring the humidity of the surface of the photovoltaic module detected by the humidity detection device after controlling the spraying device to stop; and under the condition that the detection result shows that the humidity on the surface of the photovoltaic assembly is smaller than the preset humidity, controlling the spraying device to spray the photovoltaic assembly for second preset time, wherein the second preset time is smaller than the first preset time, and under the condition that the detection result shows that the humidity on the surface of the photovoltaic assembly is larger than or equal to the preset humidity, detecting the humidity on the surface of the photovoltaic assembly again after a preset sampling interval.
Further, the controller is also used for acquiring the photovoltaic panel temperature of the photovoltaic module detected by the temperature detection device again after controlling the spraying device to stop; under the condition that the detection result shows that the temperature of the photovoltaic panel of the photovoltaic module is higher than a second preset temperature, controlling the spraying device to spray the photovoltaic module for a third preset time, wherein the second preset temperature is lower than the first preset temperature, and the third preset time is lower than the first preset time; and under the condition that the detection result shows that the temperature of the photovoltaic panel of the photovoltaic assembly is less than or equal to a second preset temperature, detecting the temperature of the photovoltaic panel of the photovoltaic assembly again after a preset sampling interval.
Further, the spraying device comprises: the rotary spray heads are arranged between two adjacent photovoltaic assemblies, and the spraying range of each rotary spray head covers the two adjacent photovoltaic assemblies; the water source is used for providing water source for the rotary spray head; the booster pump is connected with the water source and is used for boosting the water outlet of the water source; and the electromagnetic valve is connected with the booster pump and the plurality of rotary nozzles and is used for adjusting the water outlet flow of the plurality of rotary nozzles.
Further, the photovoltaic module cooling system comprises a plurality of temperature detection devices, wherein the temperature detection devices are distributed on a photovoltaic panel of the photovoltaic module at equal intervals.
Further, the photovoltaic module cooling system comprises a humidity detection device, wherein the humidity detection device is arranged on the surface of the photovoltaic module, and the distance between the humidity detection device and the lower edge of the photovoltaic module is within a specified range.
In the embodiment of the invention, the temperature of the photovoltaic panel of the photovoltaic module is stabilized in the preset temperature range corresponding to the current irradiance by adopting the temperature detection strategy to start spraying and combining the preset control strategy, so that the hysteresis caused by the spraying cooling strategy based on single temperature detection is avoided, the photovoltaic module can be maintained in a low-temperature state all the time, the problem of poor cooling effect of the photovoltaic module in the prior art is solved, and the power generation efficiency of the photovoltaic module is improved. In addition, the rapid temperature rise and rapid temperature drop of the photovoltaic module in a short time are avoided, and the service life of the photovoltaic module is prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of a control method of a photovoltaic module cooling system according to an embodiment of the present invention;
FIG. 2 is a schematic view of an alternative photovoltaic module cooling system according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of an alternative photovoltaic module cooling system according to an embodiment of the present disclosure;
FIG. 4a is a schematic view of an alternative temperature sensing device mounting location according to an embodiment of the present invention;
FIG. 4b is a schematic view of an alternative humidity sensing device installation location in accordance with an embodiment of the present invention;
FIG. 5 is a flow diagram of an alternative photovoltaic module cooling system according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a photovoltaic module cooling system according to an embodiment of the present disclosure;
fig. 7 is a time-dependent variation curve of the measured temperature of the photovoltaic module after the control method of the photovoltaic module cooling system according to the embodiment of the invention is adopted.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
In accordance with an embodiment of the present invention, there is provided an embodiment of a method for controlling a cooling system of a photovoltaic module, where the steps illustrated in the flowchart of the drawings may be executed in a computer system, such as a set of computer executable instructions, and where a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be executed in an order different from that described herein.
Fig. 1 is a control method of a photovoltaic module cooling system according to an embodiment of the present invention, where the photovoltaic module cooling system includes: the photovoltaic panel temperature detection device and the spraying device which are arranged on the photovoltaic module are shown in figure 1, and the method comprises the following steps:
step S101, controlling a spraying device to spray to a photovoltaic module under the condition that a temperature detection device detects that the temperature of a photovoltaic panel of the photovoltaic module is higher than a first preset temperature;
step S102, when the spraying time reaches a first preset time, controlling the spraying device to stop;
and S103, after the spraying device stops, controlling the spraying device through a preset control strategy so as to enable the temperature of the photovoltaic panel of the photovoltaic assembly to be within a preset temperature range corresponding to the current irradiance.
The temperature detection device can be specifically a temperature sensor, the photovoltaic panel of the photovoltaic module is a main part for receiving light irradiation and converting the light irradiation into electricity for the photovoltaic module, and the temperature sensor can be arranged on the front side or the back side of the photovoltaic panel of the photovoltaic module. Optionally, the temperature sensor is disposed on the photovoltaic module back plate (i.e., the back surface of the photovoltaic panel of the photovoltaic module), specifically, in a region of the photovoltaic module that does not receive light. Optionally, the sensing contacts of the temperature sensor are attached to the upper, middle and lower sections of the photovoltaic module backboard, so that the temperature sensor is prevented from being installed at the upper edge, the lower edge, the left edge, the right edge and the string spacing between the cells, interference of extreme weather conditions is reduced, wiring is facilitated, and the sensing contacts of the temperature sensor can be arranged at other positions of the photovoltaic panel according to the environment of the photovoltaic module.
It should be noted that the power generation efficiency of the photovoltaic module is related to the current irradiance and the temperature of the photovoltaic module corresponding to the irradiance. The same photovoltaic module temperature will produce different power generation efficiencies at different irradiance. Therefore, the temperature of the photovoltaic panel of the photovoltaic module is within the preset temperature range corresponding to the current irradiance, the temperature value of the photovoltaic module corresponding to the irradiance is within the preset range under the determined solar irradiance, and when the irradiance changes, the corresponding preset range of the temperature also changes correspondingly.
In addition, the power generation efficiency improved by the same temperature reduction amplitude is relatively determined, and the temperature reduction amplitude can be used as a factor for improving the power generation efficiency, wherein the temperature reduction amplitude refers to the difference between the photovoltaic plate temperature of the photovoltaic assembly subjected to temperature reduction and cooling by the control method and the photovoltaic plate temperature of the photovoltaic assembly not subjected to the control method and used as a reference under the conditions of the same sunlight irradiance and the photovoltaic assembly running time. Therefore, the temperature of the photovoltaic panel of the photovoltaic module is within the preset temperature range corresponding to the current irradiance, and the temperature reduction amplitude of the photovoltaic panel of the photovoltaic module can be understood to be within the preset range.
The first preset time is the time for spraying by the spraying device for the first time, and the temperature of the photovoltaic panel of the photovoltaic module is reduced within a preset range after the photovoltaic module is sprayed and cooled for the first preset time.
Above-mentioned first temperature of predetermineeing is the threshold value temperature that the photovoltaic board that is used for judging the photovoltaic module who sprays for the first time corresponds under current irradiance, understands as under current irradiance, when photovoltaic module's photovoltaic board temperature is greater than this threshold value temperature, photovoltaic module has relatively lower generating efficiency, needs to start sprinkler and cools down photovoltaic module. In step S101, the condition that the spraying device is only started to spray for the first time is that the temperature of the photovoltaic panel of the photovoltaic module is higher than the first preset temperature, after spraying is started, the temperature of the photovoltaic panel of the photovoltaic module is no longer independently used as the condition for spraying, and after spraying for the first time is finished, the preset control strategy in step S103 is used as the condition for judging whether spraying is started or not. Therefore, the control method of the invention at least comprises two sets of control strategies as the starting conditions of the spraying device: a temperature detection strategy (namely detecting the temperature of a photovoltaic panel of the photovoltaic module) is used as a judgment condition for starting spraying for the first time; the preset control strategy is used as a judgment condition for starting spraying in a continuous spraying stage (in the continuous spraying stage, the temperature of a photovoltaic panel of the photovoltaic module is controlled to be within a preset range through spraying). The control strategy preset in step S103 has various ways, and can be used as a supplement to the temperature detection strategy.
Through the steps, the photovoltaic panel temperature of the photovoltaic module is stabilized in the preset range by adopting the temperature detection strategy to start spraying and combining the preset control strategy, the hysteresis of the spraying cooling strategy based on single temperature detection is avoided, the photovoltaic module can be maintained in a low-temperature state all the time, the problem of poor cooling effect of the photovoltaic module in the prior art is solved, and the conversion efficiency and the power generation power of the photovoltaic module are improved. In addition, the rapid temperature rise and rapid temperature drop of the photovoltaic module in a short time are avoided, and the service life of the photovoltaic module is prolonged.
Optionally, the photovoltaic module cooling system includes: set up in the humidity detection device on photovoltaic module surface, control sprinkler through predetermined control strategy to make photovoltaic module's photovoltaic board temperature be in the preset temperature range that current irradiance corresponds, include following step:
step S1031, acquiring the humidity of the surface of the photovoltaic module detected by the humidity detection device;
step S1032, if the detection result shows that the humidity on the surface of the photovoltaic module is smaller than the preset humidity, the spraying device is controlled to spray the photovoltaic module for a second preset time, wherein the second preset time is smaller than the first preset time;
step S1033, if the detection result indicates that the humidity on the surface of the photovoltaic module is greater than or equal to the preset humidity, detecting the humidity on the surface of the photovoltaic module again after the preset sampling interval.
The humidity detection device is specifically a humidity sensor, is installed on the surface of the photovoltaic module and is used for detecting the humidity on the surface of the photovoltaic module. Optionally, the humidity sensor is located on a surface of a photovoltaic panel of the photovoltaic module, including the front or back surface. Optionally, the sensing contact of the humidity sensor is attached to the lower surface (i.e. the lower part of the surface, at a specified distance from the lower edge) of the photovoltaic panel of the photovoltaic module, and its placement position is related to the cooling capacity of the spraying strategy and the environment. Because when the conservative spraying strategy is adopted, the humidity of the lower surface of the photovoltaic module descends slower than that of the upper surface of the photovoltaic module, and when the humidity detected on the lower surface of the photovoltaic module reaches the preset humidity, the whole photovoltaic module also reaches the preset humidity. When an active spraying strategy is required, the position of the sensing contact of the humidity sensor can be moved upwards, and at the moment, when the humidity of the upper surface of the photovoltaic module reaches the preset humidity, the lower surface of the photovoltaic module still possibly does not reach the preset humidity. A conservative spraying strategy may be understood as a cooling control strategy with a lower heat dissipation capacity, and an active spraying strategy as a cooling control strategy with a higher heat dissipation capacity.
The preset control strategy in step S103 may be a humidity detection strategy, i.e., steps S1031-S1032 determine whether to turn on the spraying device according to the detected humidity of the surface of the photovoltaic module.
The preset humidity in the step S1032 is a humidity threshold of the surface of the photovoltaic module, which may be understood that when the humidity of the surface of the photovoltaic module is equal to the preset humidity, the heat of the surface of the photovoltaic module taken away by the evaporation of the water droplets and the water film and the heat generated by the photovoltaic module reach a balance, and if the humidity of the surface of the photovoltaic module is less than the preset humidity, the heat of the surface of the photovoltaic module taken away by the evaporation of the water droplets and the water film may be less than the heat generated by the photovoltaic module, so as to increase the temperature of the photovoltaic module, and therefore, the spraying needs to be started according to the step S1032 to increase the heat dissipation capability, so as to maintain the temperature of the photovoltaic module within a lower temperature range. In step S1033, when the humidity on the surface of the photovoltaic module is greater than or equal to the preset humidity, the heat on the surface of the photovoltaic module taken away by the water drops on the surface of the photovoltaic module and the water film evaporation meets the heat dissipation requirement of the heat generated by the photovoltaic module, and then the spraying heat dissipation is not required to be started, the humidity on the surface of the photovoltaic module is repeatedly detected by taking the preset sampling interval as a period, so as to realize real-time monitoring of the humidity, and ensure that the spraying is started in time once the humidity on the surface of the photovoltaic module is less than the preset humidity, thereby avoiding the temperature rise of the photovoltaic module.
The second preset time is a single spraying time for repeatedly starting spraying according to the surface humidity of the photovoltaic module, and is understood as that the spraying time of the spraying device at this stage is stopped after reaching the second preset time, and the spraying is stopped after reaching the second preset time again under the humidity detection condition meeting the step S1032. In the steps S1031 to S1033, the humidity on the surface of the photovoltaic module is used as the control strategy of the continuous spraying stage, and since the spraying is started for the first time in the steps S101 to S102 to take away most of the heat generated by the photovoltaic module, and the spraying in the step S1032 is only used as the supplement of the continuous spraying stage to the heat dissipation of the photovoltaic module, the required heat dissipation capacity is relatively small, and therefore the second preset time is shorter than the first preset time.
Optionally, after the spraying device is controlled to spray the photovoltaic module for a second preset time, the method further includes: and detecting the humidity of the surface of the photovoltaic module again after a preset sampling interval.
In the humidity detection strategy of steps S1031 to S1033, according to the humidity on the surface of the photovoltaic module, no matter whether spraying is started or not, the humidity on the surface of the photovoltaic module is repeatedly detected according to a preset sampling interval, so that real-time monitoring of the humidity is realized, and once the humidity on the surface of the photovoltaic module is smaller than the preset humidity, spraying is timely started, thereby avoiding temperature rise of the photovoltaic module.
Through the steps, by the control strategy based on humidity detection and time interval repeated detection, the surface humidity of the photovoltaic module is used as a judgment standard, the rapid temperature rise time after water drops and water films are evaporated on the surface of the photovoltaic module in the detection method based on the surface temperature of the photovoltaic module is reduced, spraying is controlled according to the humidity detection result in the water drops and water films on the surface of the photovoltaic module in the water film evaporation stage (namely, the water drops and the water films still exist on the surface of the photovoltaic module and can passively dissipate heat of the photovoltaic module), the rapid rise of the temperature of the photovoltaic module after the water drops and the water films are completely evaporated is avoided, the influence of rapid cooling and rapid heating of the photovoltaic module on the service life of the photovoltaic module is avoided, the module is maintained in a low-temperature state all the time, and the power generation efficiency is improved.
Optionally, the spraying device is controlled by a preset control strategy, so that the temperature of the photovoltaic panel of the photovoltaic module is within a preset temperature range corresponding to the current irradiance, and the method includes the following steps:
s1034, obtaining the temperature of the photovoltaic panel of the photovoltaic module detected by the temperature detection device again;
s1035, if the detection result shows that the temperature of the photovoltaic panel of the photovoltaic module is higher than a second preset temperature, controlling the spraying device to spray the photovoltaic module for a third preset time, wherein the second preset temperature is lower than the first preset temperature, and the third preset time is lower than the first preset time;
and S1036, if the detection result shows that the temperature of the photovoltaic panel of the photovoltaic assembly is less than or equal to a second preset temperature, detecting the temperature of the photovoltaic panel of the photovoltaic assembly again after a preset sampling interval.
Optionally, after the spraying device is controlled to spray the photovoltaic module for a third preset time, the method further includes: and detecting the temperature of the photovoltaic panel of the photovoltaic module again after a preset sampling interval.
The preset control strategy in step S103 may be a temperature detection and time interval combined strategy, that is, steps S1034 to S1036 determine whether to start the spraying device according to the detected temperature of the photovoltaic panel of the photovoltaic module, and set a fixed single spraying time and a fixed sampling time interval. By increasing the single spray time and the fixed sampling time interval, the problem of hysteresis of the temperature reduction strategy with temperature detection only in the prior art is solved.
The temperature detection means of step S1034 may be the same as the temperature sensor used in step S101. The second preset temperature is lower than the first preset temperature, and it is understood that in order to maintain the photovoltaic module to be stably at a lower temperature, the second preset temperature lower than the temperature threshold value of the photovoltaic module is set in the continuous spraying stage, so that in the continuous spraying stage, the temperature of the photovoltaic module is always lower than the second preset temperature, and the influence of rapid cooling and rapid heating of the photovoltaic module on the service life of the photovoltaic module is avoided.
Optionally, the method further includes: acquiring a first preset temperature, wherein the step of acquiring the first preset temperature comprises the following steps: acquiring environmental parameters of the environment where the photovoltaic module is located; and determining a first preset temperature according to the environmental parameter.
The above-mentioned environmental parameters may be local irradiance and environmental temperature, and the first preset temperature may be set with reference to a local irradiance and photovoltaic module temperature calculation formula, where the following is an optional theoretical calculation method of the first preset temperature:
1) through experimental data analysis, the cooling amplitude (namely temperature difference) of the photovoltaic module is related to the temperature of the photovoltaic module, and when the water consumption is the same and the temperature of the photovoltaic module is higher, the photovoltaic module is sprayed with a larger cooling amplitude;
2) when other conditions are unchanged, the temperature with the same amplitude is reduced, the improved power generation capacity is related to the current self power generation capacity, the self power generation capacity is related to the irradiance, the temperature of the photovoltaic module is related to the current environment temperature and the real-time irradiance, and the calculation formula is as follows:
Tcell＝Tamb+1/U·(α·Ginc·(1-Effic))
wherein: t iscellThe PN junction temperature of the battery piece; t isambIs ambient temperature; u is a heat dissipation coefficient; α -1-reflectance; the effect is the photoelectric conversion efficiency of the photovoltaic module; gincIs the irradiance incident on the photovoltaic component.
The first preset temperature is used as a threshold temperature for judging a photovoltaic panel of the photovoltaic module sprayed for the first time, and the cooling effect of the photovoltaic module after spraying is considered when the threshold temperature is set. The temperature of photovoltaic module is higher when irradiance is high, and cooling effect and generated energy promotion effect at this moment are more obvious, and according to theoretical calculation and experimental data, first preset temperature can be selected more than 55 ℃, and the cooling amplitude of photovoltaic module is generally more than 10 ℃ at this moment.
Optionally, the method further includes: shutting down the photovoltaic module cooling system under any one or more of the following conditions: the irradiance of the environment where the photovoltaic component is located is lower than the preset irradiance; the current time reaches the preset closing time; the conversion power of the photovoltaic module is larger than the first preset power.
Optionally, the method further includes: starting the photovoltaic module cooling system under any one or more of the following conditions: the temperature of a photovoltaic panel of the photovoltaic module is higher than a third preset temperature, wherein the third preset temperature is higher than or equal to the first preset temperature; the current time reaches the preset starting time; the conversion power of the photovoltaic module is smaller than the second preset power.
In the spraying strategy preset in step S103, the method for turning on and off the spraying device may be determined according to a specific environment scene. The following describes the above several on and off conditions:
1) irradiance is the important factor that influences photovoltaic module generating efficiency, and above-mentioned irradiance of predetermineeing can be understood as lower irradiance, is less than under the condition of predetermineeing irradiance at current irradiance, even reduce the temperature, photovoltaic module's generating efficiency's improvement range is also less, even also open photovoltaic module cooling system, also is difficult to increase substantially photovoltaic module's generating efficiency, consequently need not to open cooling system.
2) And starting the photovoltaic module cooling system when the temperature of the photovoltaic panel of the photovoltaic module is higher than a third preset temperature, wherein the temperature is a sensitive factor influencing the power generation power of the photovoltaic module, and is a condition for judging whether the photovoltaic module needs to be cooled.
3) And when the current time reaches the preset opening time, the photovoltaic module cooling system is opened, and when the current time reaches the preset closing time, the photovoltaic module cooling system is closed.
4) And when the conversion power of the photovoltaic module is greater than the first preset power, the cooling system is turned off. As an alternative, a corresponding power detection device may be provided for the photovoltaic module, and the conversion power (i.e. the generated power) of the photovoltaic module is influenced by the temperature of the photovoltaic module, and there is a corresponding relationship between the two. Under the condition that the conversion power of the photovoltaic module is smaller than the second preset power, the temperature of the photovoltaic module can be considered to have a certain influence on the conversion efficiency of the photovoltaic module, so that the generated power is reduced, and therefore, a cooling system needs to be started. The first preset can be power meeting the current requirement, and also can be higher power which can be reached by the photovoltaic module under the current irradiance, so that under the condition that the conversion power of the photovoltaic module is greater than the first preset power, the power of the photovoltaic module can be considered to be not required to be increased by adjusting the temperature, and a cooling system can be closed. It should be noted that, the first preset power and the second preset power may be the same or different, and may also be changed according to actual requirements, and the above scheme does not limit specific values of the first preset power and the second preset power.
It should be noted that the setting of the first preset time, the second preset time, the third preset time, and the preset sampling interval is related to the cooling capability of the spraying strategy, the heat dissipation capability of the photovoltaic module, and the installation inclination angle of the photovoltaic module, and may be adjusted appropriately for different applicable scenarios, which is not limited herein. The installation inclination angle of the photovoltaic module can influence the flowing effect and the conventional residual time of water drops and water films on the surface of the sprayed photovoltaic module, and indirectly influences the cooling amplitude of the photovoltaic module.
The first preset temperature, the second preset temperature and the third preset temperature can be determined according to the temperature of the photovoltaic panel of the photovoltaic module in a high-temperature environment when no cooling device is added, and can be obtained by analyzing according to the temperature rise coefficient of the photovoltaic module and by combining the specific economic benefit of the cooling of the photovoltaic module.
Fig. 5 illustrates an alternative control method of a photovoltaic module cooling system according to an embodiment of the present invention, where the photovoltaic module cooling system includes a temperature sensor mounted on a back plate of a photovoltaic module, a humidity sensor mounted on a surface of the photovoltaic module, and a controller, and the controller executes a preset control strategy through setting software and hardware. The control method comprises the following steps:
in the initial stage, a photovoltaic module cooling system is started, namely the system is powered on, and parameters such as a temperature threshold (namely a first preset temperature), a preset sampling interval, first preset time, a humidity threshold of a photovoltaic module table second and the like of a photovoltaic module backboard are preset according to local weather conditions and ambient temperature. Optionally, the first preset time may be set to 5 minutes, the second preset time may be set to 1 minute, and the preset sampling interval may be set to 15 s. The system is powered on and then proceeds to step S501.
Step S501, detecting the real-time temperature of the back plate of the photovoltaic module by the temperature sensor, and entering step S502.
Step S502, comparing the real-time temperature of the back plate of the photovoltaic module with a preset threshold temperature (namely a first preset temperature), if the temperature of the back plate of the photovoltaic module is not more than the threshold temperature, entering step S503, waiting according to a sampling interval of 15S (timing can be carried out by a timer of a controller), returning to step S501, detecting the temperature of the back plate of the photovoltaic module again, and repeating the steps; if the temperature of the photovoltaic module back plate is greater than the threshold temperature, the step S504 is entered, the controller sends an instruction to start the spraying device to carry out first spraying and cooling, the first spraying time is 5 minutes, the spraying is stopped when the 5 minutes are over, and the step S505 is entered.
In step S505, the humidity sensor detects a humidity value of the surface of the photovoltaic module, and the process proceeds to step S506.
Step S506, comparing the humidity value of the surface of the photovoltaic module with a preset humidity threshold, if the humidity value of the surface of the photovoltaic module is larger than the preset humidity threshold, entering step S507, waiting according to a sampling interval of 15S (timing can be carried out by a timer of a controller), returning to step S505, detecting the humidity value of the surface of the photovoltaic module again, and repeating the steps; and if the surface humidity value of the photovoltaic module is smaller than the preset humidity threshold value, the step S508 is carried out, the controller sends an instruction to start the spraying device for spraying, the step S507 is stopped after spraying for 1 minute, the step S507 waits for 15S according to the sampling interval, and then the step S505 is returned to detect the surface humidity value of the photovoltaic module again.
And when the ambient temperature is detected to be lower than a third preset temperature, the photovoltaic module cooling system is shut down, and the system is shut down.
Here, steps S505, S506, S507, and S508 form a repeating cycle, and by repeated detection at intervals, effective real-time monitoring of the humidity on the surface of the photovoltaic module is achieved, and a continuous spraying strategy can be executed on the photovoltaic module, so that the temperature of the back plate of the photovoltaic module is maintained at a low temperature state, the conversion efficiency and the power generation power of the photovoltaic module are improved, in addition, rapid temperature rise and rapid temperature drop of the photovoltaic module in a short time are also avoided, and the service life of the photovoltaic module is prolonged.
Fig. 7 is a curve of actually measured changes in the temperature of the photovoltaic module over time after the control method of the photovoltaic module cooling system according to the embodiment of the present invention is adopted, where the abscissa of the curve is time and the ordinate is the temperature of the photovoltaic module.
In fig. 7, the point a indicates that the spraying device is turned on to spray for the first time according to the temperature of the photovoltaic panel of the photovoltaic module, the spraying device is sprayed for the first time according to the first preset time, the point B reaches the first preset time and turns off the spraying device, the temperature of the photovoltaic module at the point B is greatly reduced compared with the point a, and the temperature of the photovoltaic module starts to rise after the spraying device is turned off at the point B. According to the spraying strategy for detecting the temperature of the photovoltaic module in the prior art, spraying (namely, the temperature same as that of the point a) can be started only when the temperature of the photovoltaic panel of the photovoltaic module reaches the set temperature threshold value again, that is, secondary spraying cooling is started at the point D of the curve, the temperature of the photovoltaic module decreases again at the point D (namely, the curve of the dotted line in the figure), the change of the temperature curve of the photovoltaic module is close to the curve formed by the point A, B, D, and the temperature of the photovoltaic module oscillates between the temperature threshold value (namely, the temperature of the point D) and the cooled low temperature.
According to the control method provided by the embodiment of the invention, the preset control strategy can start secondary spraying at the point C, and the point C can be that the humidity value of the surface of the photovoltaic module reaches the preset humidity or the temperature of the photovoltaic panel of the photovoltaic module reaches the second preset temperature. And starting secondary spraying at the point C, and beginning to decrease the temperature of the photovoltaic module when the temperature of the photovoltaic module does not reach the temperature threshold, wherein the temperature curve after spraying at the point C is a solid curve after the point C. The photovoltaic module temperature profile changes near the solid curve formed by point A, B, C. Compared with the two temperature curves, the temperature curve in the prior art has larger temperature rise and fall amplitude, and the embodiment of the invention starts spraying when the temperature of the photovoltaic module is not raised to a high value, keeps the module always in a low-temperature section lower than the temperature of the point C, and has smaller temperature rise and fall amplitude, so that the photovoltaic module can maintain high-efficiency power generation in a low-temperature section, and in addition, the rapid temperature rise and rapid temperature fall of the photovoltaic module in a short time are avoided, and the service life of the photovoltaic module is prolonged.
Example 2
According to an embodiment of the present invention, there is provided an embodiment of a cooling system for a photovoltaic module, as shown in fig. 6, including: the temperature detection device 31 is arranged on a photovoltaic panel of the photovoltaic module and used for detecting the temperature of the photovoltaic panel of the photovoltaic module; the spraying device 30 is used for spraying the photovoltaic module; and the controller 35 is connected with the temperature detection device 31 and the spraying device 30, and is used for controlling the spraying device 30 to spray to the photovoltaic module when the temperature detection device 31 detects that the temperature of the photovoltaic panel of the photovoltaic module is greater than a first preset temperature, controlling the spraying device 34 to stop when the spraying time reaches the first preset time, and controlling the spraying device 30 through a preset control strategy after the spraying device 30 stops so as to enable the temperature of the photovoltaic panel of the photovoltaic module to be within a preset temperature range corresponding to the current irradiance.
Optionally, the photovoltaic module cooling system includes: the humidity detection device is arranged on the surface of the photovoltaic module; the controller is also used for acquiring the humidity of the surface of the photovoltaic module detected by the humidity detection device after controlling the spraying device to stop; and under the condition that the detection result shows that the humidity on the surface of the photovoltaic assembly is smaller than the preset humidity, controlling the spraying device to spray the photovoltaic assembly for second preset time, wherein the second preset time is smaller than the first preset time, and under the condition that the detection result shows that the humidity on the surface of the photovoltaic assembly is larger than or equal to the preset humidity, detecting the humidity on the surface of the photovoltaic assembly again after a preset sampling interval.
Optionally, further, the controller is further configured to obtain the temperature of the photovoltaic panel of the photovoltaic module detected by the temperature detection device again after controlling the spraying device to stop; under the condition that the detection result shows that the temperature of the photovoltaic panel of the photovoltaic module is higher than a second preset temperature, controlling the spraying device to spray the photovoltaic module for a third preset time, wherein the second preset temperature is lower than the first preset temperature, and the third preset time is lower than the first preset time; and under the condition that the detection result shows that the temperature of the photovoltaic panel of the photovoltaic assembly is less than or equal to a second preset temperature, detecting the temperature of the photovoltaic panel of the photovoltaic assembly again after a preset sampling interval.
Fig. 2 is a schematic diagram of an alternative photovoltaic module cooling system according to an embodiment of the present invention, the photovoltaic module cooling system including: the temperature detection device 31 is arranged on a photovoltaic panel of the photovoltaic module; the humidity detection device 32 is arranged on the surface of the photovoltaic module; the spraying device is used for spraying the photovoltaic module; and the controller 35 is connected with the temperature detection device 31, the humidity detection device 32 and the spraying device. It should be noted that fig. 2 is a top view of a photovoltaic panel of a photovoltaic module, a temperature detection device 31 may be installed on the front side or the back side of the photovoltaic panel, the front side and the back side of the photovoltaic panel of the photovoltaic module in fig. 2 coincide, and the schematic illustration of the temperature detection device 31 in fig. 2 includes both cases of being located on the front side or the back side of the photovoltaic panel.
Alternatively, as shown in fig. 2, the spraying device includes: the rotary spray heads 33 are arranged between two adjacent photovoltaic modules, and the spraying range of the rotary spray heads 33 covers the two adjacent photovoltaic modules; a water source for supplying water to the rotary spray head 33; a booster pump 36 connected to the water source for boosting the pressure of the outlet water of the water source; and an electromagnetic valve 34 connected to the booster pump 36 and the plurality of rotary nozzles 33 for adjusting the flow rate of the outlet water from the plurality of rotary nozzles 33.
Specifically, as shown in fig. 2, the water source may be a water tap 37, and the water tap 37 is generally used in a distributed photovoltaic/domestic photovoltaic system. The booster pump 36 is arranged according to the water pressure conditions of various regions, and in regions with low water pressure, the water pressure setting of the booster pump 36 can be adjusted to meet the requirement of spraying water pressure. The solenoid valve 34 can receive a controller signal to control the start and stop of the rotary spray head. According to above-mentioned predetermined control strategy, sprinkler receives the spraying turn-on signal that the controller sent, and tap 37 opens, and booster pump 36 carries out the pressure boost according to the rivers that predetermined water pressure that sprays provided tap 37, and when rivers pressure satisfied predetermined water pressure that sprays, solenoid valve 34 opened, and rivers spray to photovoltaic module on through rotatory nozzle 33. In addition, the solenoid valve 34 can also control the flow rate of the water flow to control the cooling capacity of the spray.
In the embodiment of fig. 2, a photovoltaic string composed of 2 × 18 photovoltaic modules is provided, the number of the rotating nozzles 33 is 3, the rotating nozzles are arranged between two adjacent photovoltaic modules at equal intervals, the spraying radius of a single rotating nozzle is 5 meters, and the single rotating nozzle can cover two groups of photovoltaic strings.
The number of the rotary spray heads and the spray radius are set according to the water pressure and the scale of the cooled photovoltaic module, and the photovoltaic module to be cooled is guaranteed to be located in a spray range. As shown in fig. 3, which is a schematic diagram of a photovoltaic module cooling system with 4 rotating spray heads, in the case of the same scale as the photovoltaic module in fig. 2, 4 rotating spray heads are provided, and a rotating spray head with a smaller spraying range can be used.
Above-mentioned embodiment, through the photovoltaic module cooling system who adopts rotation type shower nozzle, has enlarged the spraying range, makes the water yield of spraying controllable, realizes high-efficient reliable photovoltaic module cooling and maintains microthermal effect to equipment is simple, and the cost is controllable, has promoted photovoltaic module's conversion efficiency and output.
Optionally, the photovoltaic module cooling system includes a plurality of temperature detection devices, wherein the plurality of temperature detection devices are distributed on the photovoltaic panel of the photovoltaic module at equal intervals.
Optionally, the photovoltaic module cooling system includes a humidity detection device, wherein the humidity detection device is disposed on the surface of the photovoltaic module, and a distance between the humidity detection device and the lower edge of the photovoltaic module is within a specified range.
The optional location of the temperature sensing device and the humidity sensing device is illustrated by taking an atlas CS6K-275M photovoltaic module as an example. For a single photovoltaic module, the cells distributed on the photovoltaic module are divided into a lower part (i.e. three rows of cells in the lower part), a middle part (i.e. three rows of cells in the middle of the module), and an upper part (i.e. three rows of cells above the module) according to positions, in order to reduce external influence, the temperature detection device and the humidity detection device should avoid the cells arranged at the upper edge, the lower edge, the left edge, the right edge, and the left edge, as shown in fig. 4a, a schematic diagram of the installation position of the temperature detection device 31 on the back panel of the photovoltaic module is shown (fig. 4a is a back view of the photovoltaic module to show the back panel position of the photovoltaic module), the number of the temperature detection devices 31 is 3, and the cells are distributed at equal intervals in the middle area of the back panel of the photovoltaic module. As shown in fig. 4b, which is a schematic view of the installation position of the humidity detection device 32 on the surface of the photovoltaic module (fig. 4b is a front view of the photovoltaic module), the humidity detection device 32 is disposed at a lower portion of the surface of the photovoltaic module and has a specified distance from the lower edge of the photovoltaic module, and the humidity detection device 32 is specifically located in a row of the lower three rows of the cells away from the lower edge.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only an alternative embodiment of the present invention, and it should be noted that modifications and embellishments could be made by those skilled in the art without departing from the principle of the present invention, and these should be considered as the protection scope of the present invention.
Claims (12)
1. A control method of a photovoltaic module cooling system is characterized by comprising the following steps: temperature-detecting device and sprinkler, wherein, the control method includes:
under the condition that the temperature detection device detects that the temperature of a photovoltaic plate of the photovoltaic assembly is higher than a first preset temperature, the spraying device is controlled to spray to the photovoltaic assembly;
when the spraying time reaches a first preset time, controlling the spraying device to stop;
after sprinkler stops, it is right through preset control strategy sprinkler controls to make photovoltaic module's photovoltaic board temperature is in the preset temperature range that current irradiance corresponds, photovoltaic module cooling system includes: set up in the humidity detection device on photovoltaic module surface is right through predetermined control strategy sprinkler controls to make photovoltaic module's photovoltaic board temperature is in the preset temperature range that current irradiance corresponds, include:
acquiring the humidity of the surface of the photovoltaic module detected by the humidity detection device;
if the detection result shows that the humidity of the surface of the photovoltaic module is smaller than the preset humidity, the spraying device is controlled to spray the photovoltaic module for a second preset time, wherein the second preset time is smaller than the first preset time;
and if the detection result shows that the humidity on the surface of the photovoltaic assembly is greater than or equal to the preset humidity, detecting the humidity on the surface of the photovoltaic assembly again after a preset sampling interval.
2. The method of claim 1, wherein after controlling the spraying device to spray the photovoltaic module for a second preset time, the method further comprises:
and detecting the humidity of the surface of the photovoltaic module again after a preset sampling interval.
3. The method of claim 1, wherein controlling the spray device by a preset control strategy to bring a photovoltaic panel temperature of the photovoltaic module within a preset temperature range corresponding to the current irradiance comprises:
obtaining the temperature of the photovoltaic panel of the photovoltaic assembly detected by the temperature detection device again;
if the detection result shows that the temperature of the photovoltaic panel of the photovoltaic assembly is greater than a second preset temperature, controlling the spraying device to spray the photovoltaic assembly for a third preset time, wherein the second preset temperature is less than the first preset temperature, and the third preset time is less than the first preset time;
and if the detection result shows that the temperature of the photovoltaic panel of the photovoltaic assembly is less than or equal to the second preset temperature, detecting the temperature of the photovoltaic panel of the photovoltaic assembly again after a preset sampling interval.
4. The method of claim 3, wherein after controlling the spraying device to spray the photovoltaic module for a third preset time, the method further comprises:
and detecting the temperature of the photovoltaic panel of the photovoltaic module again after a preset sampling interval.
5. The method of claim 1, further comprising: acquiring the first preset temperature, wherein the step of acquiring the first preset temperature comprises the following steps:
acquiring environmental parameters of the environment where the photovoltaic module is located;
and determining the first preset temperature according to the environmental parameter.
6. The method of claim 1, further comprising: shutting down the photovoltaic module cooling system under any one of the following conditions:
the irradiance of the environment where the photovoltaic component is located is lower than the preset irradiance;
the current time reaches the preset closing time;
the conversion power of the photovoltaic module is larger than a first preset power.
7. The method of claim 1, further comprising: starting the photovoltaic module cooling system under any one of the following conditions:
the temperature of a photovoltaic panel of the photovoltaic module is higher than a third preset temperature, wherein the third preset temperature is higher than or equal to the first preset temperature;
the current time reaches the preset starting time;
the conversion power of the photovoltaic module is smaller than a second preset power.
8. A photovoltaic module cooling system, characterized by includes:
the temperature detection device is arranged on a photovoltaic panel of the photovoltaic assembly and used for detecting the temperature of the photovoltaic panel of the photovoltaic assembly;
the spraying device is used for spraying the photovoltaic module;
the controller is connected with the temperature detection device and the spraying device and used for controlling the spraying device to spray to the photovoltaic assembly when the temperature detection device detects that the temperature of the photovoltaic plate of the photovoltaic assembly is higher than a first preset temperature, controlling the spraying device to stop when the spraying time reaches the first preset time, and controlling the spraying device through a preset control strategy after the spraying device stops so as to enable the temperature of the photovoltaic plate of the photovoltaic assembly to be within a preset temperature range corresponding to the current irradiance,
photovoltaic module cooling system includes: the humidity detection device is arranged on the surface of the photovoltaic module;
the controller is further used for acquiring the humidity of the surface of the photovoltaic module detected by the humidity detection device after controlling the spraying device to stop;
the detection result shows under the condition that the humidity on the surface of the photovoltaic assembly is smaller than the preset humidity, the spraying device is controlled to spray the photovoltaic assembly for second preset time, wherein the second preset time is smaller than the first preset time, the detection result shows that the humidity on the surface of the photovoltaic assembly is larger than or equal to the preset humidity, and the humidity on the surface of the photovoltaic assembly is detected again after a preset sampling interval under the condition of the preset humidity.
9. The system of claim 8, wherein the controller is further configured to obtain the photovoltaic panel temperature of the photovoltaic module detected by the temperature detection device again after controlling the spraying device to stop;
under the condition that the detection result shows that the temperature of a photovoltaic panel of the photovoltaic module is higher than a second preset temperature, controlling the spraying device to spray the photovoltaic module for a third preset time, wherein the second preset temperature is lower than the first preset temperature, and the third preset time is lower than the first preset time;
and under the condition that the detection result shows that the temperature of the photovoltaic panel of the photovoltaic assembly is less than or equal to the second preset temperature, detecting the temperature of the photovoltaic panel of the photovoltaic assembly again after a preset sampling interval.
10. The system of claim 8, wherein the spray device comprises:
the rotary spray heads are arranged between two adjacent photovoltaic modules, and the spraying range of each rotary spray head covers the two adjacent photovoltaic modules;
the water source is used for providing water source for the rotary spray head;
the booster pump is connected with the water source and is used for boosting the outlet water of the water source;
and the electromagnetic valve is connected with the booster pump and the plurality of rotary nozzles and used for adjusting the water outlet flow of the plurality of rotary nozzles.
11. The system of claim 8, wherein the photovoltaic module cooling system comprises a plurality of temperature sensing devices, wherein the plurality of temperature sensing devices are equally spaced apart on a photovoltaic panel of the photovoltaic module.
12. The system of claim 8, wherein the photovoltaic module cooling system comprises a humidity detection device, wherein the humidity detection device is disposed on the surface of the photovoltaic module and is located within a predetermined distance from the lower edge of the photovoltaic module.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202104082U (en) * | 2011-03-10 | 2012-01-11 | 王静波 | Automatic temperature controller |
| CN103015541A (en) * | 2012-12-19 | 2013-04-03 | 华南理工大学 | Wall body evaporation and temperature reduction device utilizing solar energy and nontraditional water sources |
| CN108718820A (en) * | 2018-05-10 | 2018-11-02 | 合肥学院 | A kind of solar energy planting greenhouse based on Internet of Things |
| CN108738924A (en) * | 2018-07-26 | 2018-11-06 | 深圳市均益安联光伏系统工程有限责任公司 | A kind of photovoltaic type planting greenhouse with automatic irrigation function |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011181773A (en) * | 2010-03-02 | 2011-09-15 | Sanyo Electric Co Ltd | Photovoltaic power generation system |
| FR3002796B1 (en) * | 2013-03-01 | 2016-12-30 | Sunid | METHOD AND DEVICE FOR THERMALLY REGULATING PHOTOVOLTAIC PANELS |
| US20150000723A1 (en) * | 2013-06-28 | 2015-01-01 | Tsmc Solar Ltd. | High efficiency photovoltaic system |
| KR101748722B1 (en) * | 2013-07-23 | 2017-06-19 | 엘에스산전 주식회사 | Temperature control system for solar cell module |
| JP6667245B2 (en) * | 2015-09-30 | 2020-03-18 | 三機工業株式会社 | Solar panel watering system |
| CN106301209A (en) * | 2016-10-20 | 2017-01-04 | 国网江苏省电力公司泰州供电公司 | There is the photovoltaic power generation apparatus of water-cooled and air-cooling function |
| CN106953594B (en) * | 2017-04-13 | 2019-03-05 | 合肥阳光新能源科技有限公司 | A kind of photovoltaic module spray water control system and method |
| KR101824223B1 (en) * | 2017-04-19 | 2018-02-01 | (주)탑인프라 | A cooling fan monitering system for electrical room of photovoltaic power station |
| US10581376B2 (en) * | 2017-05-24 | 2020-03-03 | Tiasha Joardar | Method and apparatus for a solar panel |
-
2020
- 2020-11-09 CN CN202011250576.5A patent/CN112367044B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202104082U (en) * | 2011-03-10 | 2012-01-11 | 王静波 | Automatic temperature controller |
| CN103015541A (en) * | 2012-12-19 | 2013-04-03 | 华南理工大学 | Wall body evaporation and temperature reduction device utilizing solar energy and nontraditional water sources |
| CN108718820A (en) * | 2018-05-10 | 2018-11-02 | 合肥学院 | A kind of solar energy planting greenhouse based on Internet of Things |
| CN108738924A (en) * | 2018-07-26 | 2018-11-06 | 深圳市均益安联光伏系统工程有限责任公司 | A kind of photovoltaic type planting greenhouse with automatic irrigation function |
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