CN115459711B - Self-checking system for heat exchange efficiency of solar photovoltaic panel - Google Patents
Self-checking system for heat exchange efficiency of solar photovoltaic panel Download PDFInfo
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- CN115459711B CN115459711B CN202211151151.8A CN202211151151A CN115459711B CN 115459711 B CN115459711 B CN 115459711B CN 202211151151 A CN202211151151 A CN 202211151151A CN 115459711 B CN115459711 B CN 115459711B
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- 239000000498 cooling water Substances 0.000 claims abstract description 73
- 238000001514 detection method Methods 0.000 claims abstract description 69
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 26
- 230000001276 controlling effect Effects 0.000 claims abstract description 11
- 238000007405 data analysis Methods 0.000 claims abstract description 9
- 238000004458 analytical method Methods 0.000 claims description 164
- 230000002277 temperature effect Effects 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000007689 inspection Methods 0.000 claims description 13
- 238000012216 screening Methods 0.000 claims description 7
- 238000005286 illumination Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 101001093143 Homo sapiens Protein transport protein Sec61 subunit gamma Proteins 0.000 claims description 3
- 101000694017 Homo sapiens Sodium channel protein type 5 subunit alpha Proteins 0.000 claims description 3
- 101100120905 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) TDH1 gene Proteins 0.000 claims description 3
- 102100027198 Sodium channel protein type 5 subunit alpha Human genes 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
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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
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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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
Abstract
The invention discloses a self-checking system for heat exchange efficiency of a solar photovoltaic panel, which comprises a solar module, a detection module, a data analysis module, a self-checking module and a regulation and control module, wherein the self-checking module is used for periodically detecting and judging the temperature and the heat exchange efficiency of the solar photovoltaic panel, so that on one hand, the condition that the flow rate of cooling water cannot be timely regulated is avoided, and on the other hand, the condition that the conversion efficiency is reduced due to the fact that the solar photovoltaic panel is damaged by lower heat exchange efficiency of the solar photovoltaic panel is avoided; the flow rate of the cooling water is intelligently and reasonably regulated and controlled based on the temperature of the solar photovoltaic panel through the regulating and controlling module, so that the purpose of reasonably regulating and controlling the heat exchange efficiency of the solar photovoltaic panel is achieved, and on one hand, the condition of reducing the conversion efficiency of the solar photovoltaic panel caused by overhigh temperature is avoided; on the other hand, excessive waste of cooling water resources is avoided.
Description
Technical Field
The invention relates to the technical field of cooling water flow rate control of photovoltaic panels, in particular to a self-checking system for heat exchange efficiency of a solar photovoltaic panel.
Background
The conversion efficiency of a solar photovoltaic panel has a direct relation with solar radiation energy, the solar photovoltaic panel is a semiconductor device for converting solar energy into electric energy, and the semiconductor device consists of a plurality of photovoltaic panels, but the solar photovoltaic panel can be prevented from generating power at too high temperature, the service life of the photovoltaic solar panel is influenced, and therefore the solar photovoltaic panel needs to be cooled.
The existing mode of cooling the solar photovoltaic panel is to add the circulating cooling water cooling module surface through the pump, this kind of scheme needs to carry out reasonable regulation to the velocity of flow of cooling water, and among the existing scheme, it is to adopt a large amount of cooling water to cool down the temperature of solar photovoltaic panel, can not intelligent to regulate and control the velocity of flow of cooling water, and the velocity of flow of cooling water also directly correlates with solar photovoltaic panel's heat exchange efficiency, further unable intelligent regulates and controls solar photovoltaic panel heat exchange efficiency, such scheme can lead to too much extravagant and the reduction of cooling water resource's utilization ratio.
In order to solve the problems, the invention provides a solution for reasonably regulating and controlling the heat exchange efficiency of the solar photovoltaic panel.
Disclosure of Invention
The invention aims to provide a self-checking system for heat exchange efficiency of a solar photovoltaic panel, which aims to solve the problems that excessive waste of cooling water resources is caused and the utilization rate of the cooling water resources is reduced due to the fact that the flow rate of cooling water cannot be intelligently regulated and controlled and the heat exchange efficiency of the solar photovoltaic panel cannot be intelligently regulated and controlled.
The aim of the invention can be achieved by the following technical scheme:
solar photovoltaic board heat exchange efficiency self-checking system includes:
the detection module is used for detecting the solar photovoltaic panel in operation;
the data analysis module is used for analyzing the detected data to obtain a negative temperature effect value QU of the solar photovoltaic panel;
the self-checking module is used for periodically checking the temperature and the heat exchange efficiency of the solar photovoltaic panel and generating checking data, and the self-checking module transmits the checking data to the regulation and control module;
the regulation and control module is used for regulating and controlling the flow rate of cooling water, and the specific regulation and control steps are as follows:
SSS1: the regulation and control module acquires detection data carried in the inspection data after receiving the inspection data transmitted by the self-inspection module;
SSS2: using the formulaCalculating and obtaining the flow velocity v1 to which the cooling water is regulated in the current state;
SSS3: the regulating and controlling module regulates and controls the flow regulating valve to enable the flow velocity of cooling water to reach v1;
the alpha is the light temperature coefficient of the solar photovoltaic panel, the beta is the water temperature coefficient of the solar photovoltaic panel, and the z is the cross section area of the cooling water pipe.
Further, the specific steps of the self-checking module for generating the inspection data are as follows:
the self-checking module is used for periodically checking the temperature of the solar photovoltaic panel and the heat exchange efficiency of the solar photovoltaic panel and generating checking data, and in one embodiment of the invention, the self-checking module checks the temperature and the heat exchange efficiency of the solar photovoltaic panel every 1 hour and generates the checking data, and the checking data generation steps are as follows:
SS1: the self-checking module acquires the temperature Id of the current solar photovoltaic panel and the heat exchange efficiency theta of the current solar photovoltaic panel;
SS2: comparing the sizes of theta and theta 1:
if theta is smaller than theta 1, the self-checking module judges that the heat exchange efficiency of the solar photovoltaic panel is too low in the current state;
the self-checking module generates a data acquisition instruction and transmits the data acquisition instruction to the detection module, and the detection module acquires and generates detection data on the absolute value Dd of the cooling water flow Cd and the temperature difference of the cooling water inlet and outlet in the current state after receiving the data acquisition instruction transmitted by the self-checking module;
the detection module transmits the detection data to the self-checking module, the self-checking module generates checking data according to the detection data and the temperature of the current solar photovoltaic panel after receiving the detection data transmitted by the detection module, and the self-checking module transmits the checking data to the regulation and control module;
if θ is greater than or equal to θ1, the self-checking module generates and stores the inspection data in a time-limited manner, and in one embodiment of the invention, the time-limited storage time is set to be 1 day, and θ1 is a preset heat exchange efficiency threshold of the solar photovoltaic panel.
Further, the light temperature coefficient α of the solar photovoltaic panel, and the water temperature coefficient β of the solar photovoltaic panel is obtained as follows:
s1: dividing analysis sections, namely dividing one analysis period into n analysis sections with equal time length, and marking the n analysis sections with equal time length of one analysis period as L1, L2, & ltSUB & gt, ln;
s2: taking an analysis section L1 as an example, obtaining effective illumination time A1, A2, & gt, at, average illumination intensity B1, B2, & gt, cooling water flow C1, C2, & gt, ct, cooling water inlet and outlet temperature difference absolute values D1, D2, & gt, dt and solar photovoltaic panel temperature change difference values E1, E2, & gt in t analysis periods; in this embodiment, t analysis periods refer to t analysis periods traced back to the past with the current analysis period as a start point; in this example, one analysis period is 1 day and one analysis period is 1 hour;
s3: calculating and obtaining light temperature influence quantities F1, F2, and Ft of light in the analysis section of t analysis periods on the solar photovoltaic panel by using a formula Ft=at=Bt, t=1, 2, and the like;
calculating and obtaining cooling water temperature influence quantities G1, G2 and Gt of cooling water in the analysis section of t analysis periods on the solar photovoltaic panel by using a formula Gt=Ct;
s4: the temperature change value on the solar photovoltaic panel can be expressed by the sum of the temperature change generated by the light acting on the solar photovoltaic panel and the temperature change generated by the cooling water acting on the solar panel, expressed as et=ft×α1+gt×dt×β1 in the formula;
the alpha 1 is the light temperature coefficient of the light in the analysis section for the solar photovoltaic panel in t analysis periods, and the beta 1 is the water temperature coefficient of the cooling water in the analysis section for the solar photovoltaic panel in t analysis periods;
s5: and respectively calculating and obtaining light temperature coefficients alpha 2, alpha 3, alpha n and water temperature coefficients beta 2, beta 3, beta n in the rest analysis sections of t analysis periods according to the steps S3 to S4, and calculating and obtaining a light temperature coefficient mean value alpha and a water temperature coefficient mean value beta.
Further, the data analysis module analyzes the detected data to obtain a conversion coefficient H of the solar photovoltaic panel, and the specific generation steps of the conversion coefficient H are as follows:
s61: in the step S1, analysis segments are divided, normal temperature analysis period and high temperature analysis period are screened for n analysis segments of t analysis periods, and the screening steps are as follows:
s62: taking one analysis section as an example, obtaining the average temperatures I1, I2, I and I of the solar photovoltaic panel of the analysis section in t analysis periods;
if the I1 is smaller than J, judging that the average temperature of the solar photovoltaic panel is I1, and the analysis period corresponding to the analysis period is a normal temperature analysis period k1;
if the I1 is larger than J, judging that the analysis period analysis section corresponding to the average temperature of the solar photovoltaic panel is I1 is a high-temperature analysis period m1;
according to the steps, the average temperatures I1, I2, I, J of the solar photovoltaic panels of the analysis section in t analysis periods are sequentially compared, the normal temperature analysis period ko is obtained through screening, the period of the high-temperature analysis mp,the J is a preset temperature threshold;
s63: the method comprises the steps of obtaining conversion efficiency No of a solar photovoltaic panel in a normal temperature analysis period ko and light temperature influence quantity Fo of the normal temperature analysis period ko;
calculating and obtaining a conversion coefficient Ho of a normal temperature analysis period ko by using a formula Ho=No/Fo, and calculating and obtaining a conversion coefficient mean value HO1 of the normal temperature analysis period ko;
s64: respectively obtaining conversion coefficients HO2, HO3, and HOn of normal temperature analysis periods corresponding to n different analysis sections of t analysis periods according to the steps from S61 to S63;
the conversion coefficient H of the solar photovoltaic panel was obtained by calculation using the formula h= (HO 1+ HO2+ & gt HOn)/n.
Further, the specific steps of the data analysis module for analyzing the detection data to obtain the negative temperature effect value QU of the solar photovoltaic panel are as follows:
s71: in the step S62, the conversion efficiency Np of the solar photovoltaic panel in the high-temperature analysis period mp and the light temperature influence Fp in the high-temperature analysis period are obtained;
s72: calculating a negative temperature effect value Qp of the high-temperature analysis period mp by using a formula qp=fp×h-Np, and obtaining an average value QU1 of the negative temperature effect value of the high-temperature analysis period mp;
s73: sequentially obtaining average values QU2, QU3, QUn of negative temperature effect values in n analysis sections of t analysis periods according to steps S71 to S72;
using the formulaCalculating and obtaining the discrete value of the average value of the negative temperature effect values in n analysis sections of t analysis periods; comparing the sizes of R and R1, deleting QUi corresponding to R more than or equal to R1, calculating the discrete value of the average value of the residual negative temperature effect, and comparing the discrete value with R1, wherein R1 is a preset threshold value; the QU is the average of the negative temperature effects of the solar photovoltaic panels involved in the residual discrete value calculation.
Further, the solar module comprises a solar photovoltaic panel, the solar photovoltaic panel is fixedly connected with a circulating water pump through a cooling water pipe, and a flow regulating valve is arranged on the cooling water pipe.
Further, the detection module comprises a photovoltaic detection unit, a temperature detection unit, a flow detection unit and a detection data table, wherein the photovoltaic detection unit comprises a special solar photovoltaic tester; the temperature detection unit comprises a 110PV patch type temperature sensor and a cooling water temperature sensor; the flow detection unit includes a cross-sectional flow meter.
The invention has the beneficial effects that:
(1) According to the invention, the temperature and the heat exchange efficiency of the solar photovoltaic panel are periodically detected and judged through the self-checking module, so that the condition that the flow rate of cooling water cannot be timely adjusted is avoided, and the condition that the conversion efficiency is reduced due to the fact that the solar photovoltaic panel is damaged by the lower heat exchange efficiency of the solar photovoltaic panel is avoided;
(2) According to the invention, the flow rate of cooling water is intelligently and reasonably regulated and controlled based on the temperature of the solar photovoltaic panel through the regulating and controlling module, so that the purpose of reasonably regulating and controlling the heat exchange efficiency of the solar photovoltaic panel is achieved, and on one hand, the condition of reducing the conversion efficiency of the solar photovoltaic panel caused by overhigh temperature is avoided; on the other hand, excessive waste of cooling water resources is avoided.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a system block diagram of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
As shown in FIG. 1, the self-checking system for heat exchange efficiency of the solar photovoltaic panel comprises a solar module, a detection module, a data analysis module, a self-checking module and a regulation and control module.
The solar module is used for absorbing solar energy, converting the solar energy into electric energy and cooling a solar photovoltaic panel, the solar module comprises the solar photovoltaic panel, the solar photovoltaic panel is fixedly connected with a circulating water pump through a cooling water pipe, a flow regulating valve is further arranged on the cooling water pipe, and the flow regulating valve is used for reasonably regulating and controlling the flow rate of cooling water in the cooling water pipe.
The detection module is used for detecting data generated in the solar working process and comprises a photovoltaic detection unit, a temperature detection unit, a flow detection unit, a heat exchange efficiency detection unit and a detection data table;
the photovoltaic detection unit comprises a special solar photovoltaic tester, the special solar photovoltaic tester detects the photoelectric conversion efficiency of the solar photovoltaic panel to generate photoelectric conversion efficiency data of the solar photovoltaic panel, and the photovoltaic detection unit transmits the photoelectric conversion efficiency data to a detection data table for storage;
the temperature detection unit comprises a 110PV patch type temperature sensor and a cooling water temperature sensor, wherein an adhesive strip on the smooth surface of the 110PV patch type temperature sensor is attached to the back surface of the solar photovoltaic panel;
the cooling water temperature sensor is arranged at the water inlet and the water outlet of the circulating cooling water and is in contact with the cooling water, and detects the water inlet temperature and the water outlet temperature of the circulating cooling water to generate cooling water inlet and outlet temperature data and transmits the cooling water inlet and outlet temperature data to the detection data table;
the flow detection unit comprises a cross-section flowmeter which is sleeved on the cooling water pipe and is used for detecting the flow of cooling water in the cooling water pipe to generate flow detection data and transmitting the flow detection data to a detection data table for storage;
the heat exchange efficiency detection unit is used for detecting the heat exchange efficiency of the solar photovoltaic panel to generate heat exchange efficiency detection data and transmitting the detection data to the detection data table for storage.
The data analysis module is used for analyzing the detected data, and the specific analysis steps are as follows:
s1: dividing analysis sections, namely dividing one analysis period into n analysis sections with equal time length, and marking the n analysis sections with equal time length of one analysis period as L1, L2, & ltSUB & gt, ln;
s2: taking an analysis section L1 as an example, obtaining effective illumination time A1, A2, & gt, at, average illumination intensity B1, B2, & gt, cooling water flow C1, C2, & gt, ct, cooling water inlet and outlet temperature difference absolute values D1, D2, & gt, dt and solar photovoltaic panel temperature change difference values E1, E2, & gt in t analysis periods; in one embodiment of the present invention, t analysis periods refer to t analysis periods traced back to the past starting from the current analysis period; in one embodiment of the invention, one analysis period is 1 day and one analysis period is 1 hour;
s3: calculating and obtaining light temperature influence quantities F1, F2, and Ft of light in the analysis section of t analysis periods on the solar photovoltaic panel by using a formula Ft=at=Bt, t=1, 2, and the like;
calculating and obtaining cooling water temperature influence quantities G1, G2 and Gt of cooling water in the analysis section of t analysis periods on the solar photovoltaic panel by using a formula Gt=Ct;
s4: the continuous light irradiation can lead to the temperature rise of the solar photovoltaic panel, and the cooling water continuously cools the solar photovoltaic panel, so that the temperature change value of the solar photovoltaic panel can be represented by the sum of the temperature change generated by light acting on the solar photovoltaic panel and the temperature change generated by the cooling water acting on the solar panel, and the formula is expressed as et=ft+α1+gt dt β1;
the alpha 1 is the light temperature coefficient of the light in the analysis section for the solar photovoltaic panel in t analysis periods, and the beta 1 is the water temperature coefficient of the cooling water in the analysis section for the solar photovoltaic panel in t analysis periods;
s5: respectively calculating and obtaining light temperature coefficients alpha 2, alpha 3, alpha n and water temperature coefficients beta 2, beta 3 in the rest analysis sections of t analysis periods according to the steps S3 to S4;
calculating and obtaining a light temperature coefficient mean value of the solar photovoltaic panel by using a formula alpha= (alpha 1+ alpha 2+ alpha n)/n;
calculating and obtaining a water temperature coefficient mean value of the solar photovoltaic panel by using a formula beta= (beta 1+ beta 2+ & gt. + beta n)/n;
s6: obtaining a conversion coefficient H of a solar photovoltaic panel;
s61: and (3) screening normal temperature analysis periods and high temperature analysis periods for n analysis periods of the t analysis periods, wherein the screening steps are as follows:
s62: taking one analysis section as an example, obtaining the average temperatures I1, I2, I and I of the solar photovoltaic panel of the analysis section in t analysis periods;
if the I1 is smaller than J, judging that the average temperature of the solar photovoltaic panel is I1, and the analysis period corresponding to the analysis period is a normal temperature analysis period k1;
if the I1 is larger than J, judging that the analysis period analysis section corresponding to the average temperature of the solar photovoltaic panel is I1 is a high-temperature analysis period m1;
according to the steps, the average temperatures I1, I2, I, J of the solar photovoltaic panels of the analysis section in t analysis periods are sequentially compared, the normal temperature analysis period ko is obtained through screening,the period of the high-temperature analysis mp,
s63: the method comprises the steps of obtaining conversion efficiency No of a solar photovoltaic panel in a normal temperature analysis period and light temperature influence quantity Fo in the normal temperature analysis period;
calculating and obtaining a conversion coefficient Ho of a normal temperature analysis period by using a formula Ho=No/Fo;
calculating and obtaining a conversion coefficient mean value HO1 of the normal temperature analysis period;
s64: respectively obtaining conversion coefficients HO2, HO3, and HOn of normal temperature analysis periods corresponding to n different analysis segments according to the steps from S61 to S63;
calculating and obtaining a conversion coefficient H of the solar photovoltaic panel by using a formula H= (HO1+HO2+) + HOn)/n;
s7: acquiring a negative temperature effect value QU of a solar photovoltaic panel;
s71: in the step S62, the conversion efficiency Np of the solar photovoltaic panel in the high-temperature analysis period mp and the light temperature influence Fp in the high-temperature analysis period are obtained;
s72: calculating a negative temperature effect value Qp of the high-temperature analysis period mp by using a formula qp=fp×h-Np, and obtaining an average value QU1 of the negative temperature effect value of the high-temperature analysis period mp;
s73: sequentially obtaining average values QU2, QU3, QUn of negative temperature effect values in n analysis sections of t analysis periods according to steps S71 to S72;
using the formulaCalculating and obtaining the discrete value of the average value of the negative temperature effect values in n analysis sections of t analysis periods; comparing the sizes of R and R1, deleting QUi corresponding to R more than or equal to R1, calculating the discrete value of the average value of the residual negative temperature effect, and comparing the discrete value with R1, wherein R1 is a preset threshold value; the QU is an average value of negative temperature effects of the solar photovoltaic panel participating in the operation of the residual discrete values;
the self-checking module is used for periodically checking the temperature of the solar photovoltaic panel and the heat exchange efficiency of the solar photovoltaic panel and generating checking data, and in one embodiment of the invention, the self-checking module checks the temperature and the heat exchange efficiency of the solar photovoltaic panel every 1 hour and generates the checking data, and the checking data generation steps are as follows:
SS1: the self-checking module acquires the temperature Id of the current solar photovoltaic panel and the heat exchange efficiency theta of the current solar photovoltaic panel;
SS2: comparing the sizes of theta and theta 1:
if theta is smaller than theta 1, the self-checking module judges that the heat exchange efficiency of the solar photovoltaic panel is too low in the current state;
the self-checking module generates a data acquisition instruction and transmits the data acquisition instruction to the detection module, and the detection module acquires and generates detection data on the absolute value Dd of the cooling water flow Cd and the temperature difference of the cooling water inlet and outlet in the current state after receiving the data acquisition instruction transmitted by the self-checking module;
the detection module transmits the detection data to the self-checking module, the self-checking module generates checking data according to the detection data and the temperature of the current solar photovoltaic panel after receiving the detection data transmitted by the detection module, and the self-checking module transmits the checking data to the regulation and control module;
if theta is more than or equal to theta 1, the self-checking module generates inspection data and stores the inspection data in a time-limited manner, and in one embodiment of the invention, the time-limited storage time is set to be 1 day, and theta 1 is a heat exchange efficiency threshold value of a preset solar photovoltaic panel;
the regulation and control module regulates and controls the flow rate of the cooling water after receiving the inspection data transmitted by the self-checking module, and the specific regulation and control steps are as follows:
SSS1: using the formulaCalculating and obtaining the flow velocity v1 to which the cooling water is regulated in the current state;
SSS2: the regulating and controlling module regulates and controls the flow regulating valve to enable the flow velocity of cooling water to reach v1;
and z is the cross-sectional area of the cooling water pipe.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (3)
1. Solar photovoltaic board heat exchange efficiency self-checking system, its characterized in that includes:
the detection module is used for detecting the solar photovoltaic panel in operation;
the data analysis module is used for analyzing the detected data to obtain a negative temperature effect value QU of the solar photovoltaic panel;
the self-checking module is used for periodically checking the temperature and the heat exchange efficiency of the solar photovoltaic panel and generating checking data, setting the detection period to be 1 hour, and transmitting the checking data to the regulation and control module;
the regulation and control module is used for regulating and controlling the flow rate of cooling water, and the specific regulation and control steps are as follows:
SSS1: the regulation and control module acquires detection data carried in the inspection data after receiving the inspection data transmitted by the self-inspection module;
SSS2: using the formula v1=Calculating and obtaining the flow velocity v1 to which the cooling water is regulated in the current state;
SSS3: the regulating and controlling module regulates and controls the flow regulating valve to enable the flow velocity of cooling water to reach v1;
the alpha is the light temperature coefficient of the solar photovoltaic panel, the beta is the water temperature coefficient of the solar photovoltaic panel, and the z is the cross section area of the cooling water pipe;
the specific steps of the self-checking module for generating the examination data are as follows:
the step of generating the examination data is as follows:
SS1: the self-checking module acquires the temperature Id of the current solar photovoltaic panel and the heat exchange efficiency theta of the current solar photovoltaic panel;
SS2: comparing the sizes of theta and theta 1:
if theta is smaller than theta 1, the self-checking module judges that the heat exchange efficiency of the solar photovoltaic panel is too low in the current state;
the self-checking module generates a data acquisition instruction and transmits the data acquisition instruction to the detection module, and the detection module acquires and generates detection data on the absolute value Dd of the cooling water flow Cd and the temperature difference of the cooling water inlet and outlet in the current state after receiving the data acquisition instruction transmitted by the self-checking module;
the detection module transmits the detection data to the self-checking module, the self-checking module generates checking data according to the detection data and the temperature of the current solar photovoltaic panel after receiving the detection data transmitted by the detection module, and the self-checking module transmits the checking data to the regulation and control module;
if theta is more than or equal to theta 1, the self-checking module generates inspection data and stores the inspection data in a time-limited manner, the time-limited storage time is set to be 1 day, and the theta 1 is a preset heat exchange efficiency threshold value of the solar photovoltaic panel;
the solar photovoltaic panel light temperature coefficient alpha and the solar photovoltaic panel water temperature coefficient beta are obtained by the following steps:
s1: dividing analysis sections, namely dividing one analysis period into n analysis sections with equal time length, and marking the n analysis sections with equal time length of one analysis period as L1, L2, & ltSUB & gt, ln;
s2: taking an analysis section L1 as an example, obtaining effective illumination time A1, A2, & gt, at, average illumination intensity B1, B2, & gt, cooling water flow C1, C2, & gt, ct, cooling water inlet and outlet temperature difference absolute values D1, D2, & gt, dt and solar photovoltaic panel temperature change difference values E1, E2, & gt in t analysis periods; wherein t analysis periods refer to t analysis periods traced back to the past with the current analysis period as a starting point; one analysis period was 1 day and one analysis period was 1 hour;
s3: calculating and obtaining light temperature influence quantities F1, F2, and Ft of light in the analysis section of t analysis periods on the solar photovoltaic panel by using a formula Ft=at=Bt, t=1, 2, and the like;
calculating and obtaining cooling water temperature influence quantities G1, G2 and Gt of cooling water in the analysis section of t analysis periods on the solar photovoltaic panel by using a formula Gt=Ct;
s4: the temperature change value on the solar photovoltaic panel can be expressed by the sum of the temperature change generated by the light acting on the solar photovoltaic panel and the temperature change generated by the cooling water acting on the solar panel, expressed as et=ft+α1+gt β1 in the formula;
the alpha 1 is the light temperature coefficient of the light in the analysis section for the solar photovoltaic panel in t analysis periods, and the beta 1 is the water temperature coefficient of the cooling water in the analysis section for the solar photovoltaic panel in t analysis periods;
s5: respectively calculating and obtaining light temperature coefficients alpha 2, alpha 3, alpha n and water temperature coefficients beta 2, beta 3, beta n in the rest analysis sections of t analysis periods according to the steps S3 to S4, and calculating to obtain a light temperature coefficient mean value alpha and a water temperature coefficient mean value beta, wherein the light temperature coefficient mean value alpha and the water temperature coefficient mean value beta are expressed as alpha= (alpha 1+ alpha 2+ alpha n)/n and beta= (beta 1+ beta 2+ beta n)/n in a formula;
the data analysis module analyzes the detected data to obtain the specific generation steps of the conversion coefficient H of the solar photovoltaic panel, wherein the specific generation steps are as follows:
s61: in the step S1, analysis segments are divided, normal temperature analysis period and high temperature analysis period are screened for n analysis segments of t analysis periods, and the screening steps are as follows:
s62: taking one analysis section as an example, obtaining the average temperatures I1, I2, I and I of the solar photovoltaic panel of the analysis section in t analysis periods;
if the I1 is smaller than J, judging that the average temperature of the solar photovoltaic panel is I1, and the analysis period corresponding to the analysis period is a normal temperature analysis period k1;
if the I1 is larger than J, judging that the analysis period analysis section corresponding to the average temperature of the solar photovoltaic panel is I1 is a high-temperature analysis period m1;
according to the steps, the average temperatures I1, I2, I, J of the solar photovoltaic panels in the analysis section in t analysis periods are compared in sequence, and normal temperature analysis periods ko, o ⊆ [1, t ] are obtained through screening; a high temperature analysis period mp, p ⊆ [1, t ], wherein J is a preset temperature threshold;
s63: the method comprises the steps of obtaining conversion efficiency No of a solar photovoltaic panel in a normal temperature analysis period ko and light temperature influence quantity Fo of the normal temperature analysis period ko;
calculating and obtaining a conversion coefficient Ho of a normal temperature analysis period ko by using a formula Ho=No/Fo, and calculating and obtaining a conversion coefficient mean value HO1 of the normal temperature analysis period ko;
s64: respectively obtaining conversion coefficients HO2, HO3, and HOn of normal temperature analysis periods corresponding to n different analysis sections of t analysis periods according to the steps from S61 to S63;
calculating and obtaining a conversion coefficient H of the solar photovoltaic panel by using a formula H= (HO1+HO2+) + HOn)/n;
the data analysis module analyzes the detection data to obtain a negative temperature effect value QU of the solar photovoltaic panel, and the specific steps are as follows:
s71: in the step S62, the conversion efficiency Np of the solar photovoltaic panel in the high-temperature analysis period mp and the light temperature influence Fp in the high-temperature analysis period are obtained;
s72: calculating a negative temperature effect value Qp of the high-temperature analysis period mp by using a formula qp=fp×h-Np, and obtaining an average value QU1 of the negative temperature effect value of the high-temperature analysis period mp;
s73: sequentially obtaining average values QU2, QU3, QUn of negative temperature effect values in n analysis sections of t analysis periods according to steps S71 to S72;
using the formula R =Calculating and obtaining the discrete value of the average value of the negative temperature effect values in n analysis sections of t analysis periods; comparing the sizes of R and R1, deleting QUi corresponding to R more than or equal to R1, calculating the discrete value of the average value of the residual negative temperature effect, and comparing the discrete value with R1, wherein R1 is a preset threshold value; the QU is the average of the negative temperature effects of the solar photovoltaic panels involved in the residual discrete value calculation.
2. The self-checking system for heat exchange efficiency of a solar photovoltaic panel according to claim 1, wherein the solar module comprises a solar photovoltaic panel, the solar photovoltaic panel is fixedly connected with a circulating water pump through a cooling water pipe, and a flow regulating valve is arranged on the cooling water pipe.
3. The solar photovoltaic panel heat exchange efficiency self-checking system according to claim 1, wherein the detection module comprises a photovoltaic detection unit, a temperature detection unit, a flow detection unit, a heat exchange efficiency detection unit and a detection data table, and the photovoltaic detection unit comprises a special solar photovoltaic tester; the temperature detection unit comprises a 110PV patch type temperature sensor and a cooling water temperature sensor; the flow detection unit includes a cross-sectional flow meter.
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