Performance evaluation method and system for photovoltaic panel

Abstract

The invention relates to the technical field of photovoltaic power generation, and discloses a performance evaluation method and system for a photovoltaic panel, and the method comprises the steps: constructing a test simulation environment of the photovoltaic panel; detecting a current value and a voltage value of the photovoltaic panel under a standard test condition; drawing an I-V curve to determine the maximum power point of the curve and the corresponding maximum output power; the rated power is determined according to the model parameters of the photovoltaic panel, and the conversion efficiency of the photovoltaic panel is determined based on the maximum output power and the rated power; adjusting the temperature of the photovoltaic panel, detecting an adjusting temperature value and an adjusting current value when the voltage value is the maximum power voltage value, and determining a temperature coefficient of the photovoltaic panel according to the adjusting temperature value, the adjusting current value and the maximum power voltage value; and performing performance evaluation on the photovoltaic panel according to the temperature coefficient and the conversion efficiency of the photovoltaic panel. By constructing the simulation environment and determining the conversion efficiency and the temperature coefficient for performance evaluation, the accuracy and reliability of test data can be ensured, and the evaluation result is more comprehensive and objective.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and in particular to a performance evaluation method and system for photovoltaic panels. Background Art

[0002] In photovoltaic power generation systems, photovoltaic panels are core components, and their performance directly affects the power generation efficiency and stability of the entire system. Traditional photovoltaic panel performance evaluation methods usually rely on field testing, which is not only time-consuming and labor-intensive, but also greatly affected by environmental factors, making it difficult to ensure the accuracy and repeatability of the evaluation results. In addition, field testing cannot monitor the performance changes of photovoltaic panels in real time, and has limited role in early fault warning and maintenance guidance for photovoltaic panels. Therefore, it is particularly important to develop an efficient, accurate and real-time evaluation method and system that can monitor the performance of photovoltaic panels. Summary of the invention

[0003] The purpose of the present invention is to provide a performance evaluation method and system for photovoltaic panels, aiming to solve the above problems.

[0004] The present invention provides a performance evaluation method for a photovoltaic panel, comprising:

[0005] A test simulation environment for photovoltaic panels is constructed, and the test simulation environment is connected to a control system.

[0006] The test simulation environment is set to standard test conditions through the control system, and the current value and voltage value of the photovoltaic panel are detected under the standard test conditions.

[0007] An IV curve is drawn according to the current value and the voltage value, a maximum power point of the IV curve is determined, and a maximum power voltage value, a maximum power current value and a maximum output power of the photovoltaic panel corresponding to the maximum power point are determined.

[0008] The rated power of the photovoltaic panel is determined according to the model parameters of the photovoltaic panel, and the conversion efficiency of the photovoltaic panel is determined based on the maximum output power and the rated power.

[0009] The temperature of the photovoltaic panel is adjusted by a control system, the control voltage value is a maximum power voltage value, the adjustment temperature value and the adjustment current value are detected, and the temperature coefficient of the photovoltaic panel is determined according to the adjustment temperature value, the adjustment current value and the maximum power voltage value.

[0010] The performance of photovoltaic panels is evaluated based on their temperature coefficient and conversion efficiency.

[0011] Preferably, the standard test conditions include: solar radiation intensity of 1000W / m 2 , the photovoltaic panel temperature is 25℃ and the air mass AM is 1.5.

[0012] Preferably, drawing an IV curve according to the current value and the voltage value to determine the maximum power point of the IV curve includes:

[0013] The product of the voltage value and the current value at each point is calculated, the point corresponding to the maximum value in the product is determined as the maximum power point, and the maximum value in the product is determined as the maximum output power.

[0014] Preferably, determining the rated power of the photovoltaic panel according to the model parameters of the photovoltaic panel includes:

[0015] A model power comparison table is preset, and the model power comparison table includes several model parameters, and each model parameter is set with a corresponding rated power;

[0016] Based on the model power comparison table, the corresponding rated power is determined according to the model parameters of the photovoltaic panel.

[0017] Preferably, when the conversion efficiency of the photovoltaic panel is determined based on the maximum output power and the rated power, the conversion efficiency is determined according to the following formula:

[0018]

[0019] Among them, E represents conversion efficiency, Pmax represents maximum output power, and Pe represents rated power.

[0020] Preferably, determining the temperature coefficient of the photovoltaic panel according to the adjusted temperature value, the adjusted current value and the maximum power voltage value includes:

[0021] Determining an adjusted power value according to the adjusted current value and the maximum power voltage value;

[0022] Determine an initial temperature coefficient corresponding to each adjustment temperature value according to the adjustment power value, the maximum output power value and the adjustment temperature value;

[0023] An average value of the initial temperature coefficients is calculated, and the average value is set as the temperature coefficient of the photovoltaic panel.

[0024] Preferably, the initial temperature coefficient is determined according to the following formula:

[0025]

[0026] Among them, Ai represents the initial temperature coefficient corresponding to the i-th adjustment temperature value, Pti represents the adjustment power value at the i-th adjustment temperature value, Pmax represents the maximum output power, Tti represents the i-th adjustment temperature value, and Tstc represents the photovoltaic panel temperature under standard test conditions.

[0027] Preferably, the performance of the photovoltaic panel is evaluated based on the temperature coefficient and conversion efficiency of the photovoltaic panel, including:

[0028] Determine the performance evaluation value of the photovoltaic panel based on the temperature coefficient and conversion efficiency of the photovoltaic panel;

[0029] Classifying the performance of the photovoltaic panel according to the performance evaluation value to determine the performance of the photovoltaic panel;

[0030] The performance evaluation value is determined according to the following formula:

[0031] V = q1 × E + q2 × A;

[0032] Among them, V represents the performance evaluation value, q1 represents the conversion efficiency influence weight, E represents the conversion efficiency, q2 represents the temperature coefficient influence weight, and A represents the temperature coefficient.

[0033] Preferably, grading the performance of the photovoltaic panels according to the performance evaluation value comprises:

[0034] A first preset evaluation value, a second preset evaluation value and a third preset evaluation value are preset, and the first preset evaluation value, the second preset evaluation value and the third preset evaluation value increase in sequence;

[0035] setting a performance level of the photovoltaic panel according to a relationship between the performance evaluation value and the first preset evaluation value, the second preset evaluation value and the third preset evaluation value;

[0036] If the performance evaluation value is less than the first preset evaluation value, the performance level of the photovoltaic panel is set to the first preset performance level L1;

[0037] If the performance evaluation value is greater than or equal to the first preset evaluation value, and the performance evaluation value is less than the second preset evaluation value, setting the performance level of the photovoltaic panel to the second preset performance level L2;

[0038] If the performance evaluation value is greater than or equal to the second preset evaluation value, and the performance evaluation value is less than the third preset evaluation value, then the performance level of the photovoltaic panel is set to the third preset performance level L3;

[0039] If the performance evaluation value is greater than or equal to the third preset evaluation value, the performance level of the photovoltaic panel is set to a fourth preset performance level L4; and L1<L2<L3<L4.

[0040] The present invention also discloses a performance evaluation system for photovoltaic panels, which is used to apply the above-mentioned performance evaluation method for photovoltaic panels, comprising:

[0041] An environment construction module, configured to construct a test simulation environment for photovoltaic panels, wherein the test simulation environment is connected to a control system;

[0042] a control system connected to the environment building module and configured to control test conditions within the test simulation environment;

[0043] The detection module is configured to detect the current value and voltage value of the photovoltaic panel under the standard test conditions when the test simulation environment is set to the standard test conditions through the control system; and is also configured to detect the adjusted temperature value and the adjusted current value when the temperature of the photovoltaic panel is adjusted through the control system and the voltage value is controlled to be the maximum power voltage value;

[0044] a maximum power determination module, configured to draw an IV curve according to the current value and the voltage value, determine the maximum power point of the IV curve, and determine the maximum power voltage value, the maximum power current value and the maximum output power of the photovoltaic panel corresponding to the maximum power point;

[0045] An analysis module is configured to determine the rated power of the photovoltaic panel according to the model parameters of the photovoltaic panel, determine the conversion efficiency of the photovoltaic panel based on the maximum output power and the rated power; and determine the temperature coefficient of the photovoltaic panel according to the adjustment temperature value, the adjustment current value and the maximum power voltage value;

[0046] The performance evaluation module evaluates the performance of photovoltaic panels based on their temperature coefficient and conversion efficiency.

[0047] Compared with the prior art, the beneficial effect of the present invention is that the present invention not only considers the performance of photovoltaic panels under standard test conditions (such as maximum power point, maximum output power, etc.), but also considers the influence of temperature on the performance of photovoltaic panels, and evaluates the temperature coefficient of photovoltaic panels by adjusting the temperature and detecting relevant parameters. This helps to more comprehensively understand the working performance of photovoltaic panels under different environmental conditions. By accurately setting the standard test conditions of the test simulation environment through the control system, and adjusting the temperature and detecting the current value at a specific voltage value, the accuracy and reliability of the test data can be ensured. Based on the comparison of the maximum output power and the rated power, the conversion efficiency of the photovoltaic panel can be determined. This indicator is of great significance for measuring the ability of photovoltaic panels to convert solar energy into electrical energy, and helps users choose more efficient photovoltaic products. By determining the temperature coefficient of the photovoltaic panel, the degree of influence of temperature changes on the performance of the photovoltaic panel can be analyzed. This is of great value in predicting the actual working performance of photovoltaic panels under different temperature environments, optimizing the design and operation strategy of photovoltaic systems, etc. Comprehensively considering multiple factors such as conversion efficiency and temperature coefficient to evaluate the performance of photovoltaic panels, the evaluation results are more comprehensive and objective. This helps users to more accurately understand the overall performance level of photovoltaic panels and provide strong support for decision-making. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0049] Figure 1 It is a schematic flow chart of a performance evaluation method for photovoltaic panels of the present invention;

[0050] Figure 2 It is a functional block diagram of a performance evaluation system for photovoltaic panels according to the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] like Figure 1 As shown, the present invention provides a performance evaluation method for a photovoltaic panel, comprising:

[0053] A test simulation environment for photovoltaic panels is constructed, and the test simulation environment is connected to a control system.

[0054] The test simulation environment is set to standard test conditions through the control system, and the current value and voltage value of the photovoltaic panel are detected under the standard test conditions.

[0055] An IV curve is drawn according to the current value and the voltage value, a maximum power point of the IV curve is determined, and a maximum power voltage value, a maximum power current value and a maximum output power of the photovoltaic panel corresponding to the maximum power point are determined.

[0056] The rated power of the photovoltaic panel is determined according to the model parameters of the photovoltaic panel, and the conversion efficiency of the photovoltaic panel is determined based on the maximum output power and the rated power.

[0057] The temperature of the photovoltaic panel is adjusted by a control system, the control voltage value is a maximum power voltage value, the adjustment temperature value and the adjustment current value are detected, and the temperature coefficient of the photovoltaic panel is determined according to the adjustment temperature value, the adjustment current value and the maximum power voltage value.

[0058] The performance of photovoltaic panels is evaluated based on their temperature coefficient and conversion efficiency.

[0059] The control system can set the test conditions of the test simulation environment according to the needs, and when the photovoltaic panels are tested for power generation, the temperature of the photovoltaic panels will gradually change. Therefore, the control system is required to adjust the temperature of the photovoltaic panels in real time to keep the temperature of the photovoltaic panels at 25°C in the standard test conditions. When the temperature of the photovoltaic panels does not need to be controlled at a constant temperature, it is adjusted according to the needs.

[0060] In some embodiments of the present application, the standard test conditions include: the solar radiation intensity is 1000W / m 2 , the photovoltaic panel temperature is 25℃ and the air mass AM is 1.5.

[0061] Standard test conditions (STC) are a critical reference when evaluating and comparing photovoltaic panel performance. Standard test conditions usually include the following three main parameters:

[0062] Solar radiation intensity: This refers to the power density of sunlight hitting the surface of the photovoltaic panel, measured in watts per square meter (W / m 2 ). Under standard test conditions, this value is set to 1000W / m 2 This intensity is roughly equivalent to the radiation intensity when the sun is directly above the ground at noon on a clear day.

[0063] PV panel temperature: The temperature of the PV panel affects its efficiency and output power. Under standard test conditions, the temperature of the PV panel is set to 25°C. This temperature is a relatively mild ambient temperature, which can reduce performance fluctuations caused by temperature changes.

[0064] Air Mass (AM): Air Mass refers to the path length that sunlight takes to reach the ground through the atmosphere. The larger the AM value, the thicker the atmosphere that the light passes through, and the greater the loss of scattering and absorption. Under standard test conditions, the air mass is set to 1.5. This value represents the average path length of sunlight through the atmosphere and is suitable for testing in most geographical locations and weather conditions.

[0065] By testing under these uniform conditions, it is ensured that performance comparisons between different PV panels are fair and accurate. These standard test conditions provide a reliable reference point for evaluating the performance of PV panels, both in a laboratory setting and in real-world applications.

[0066] In some embodiments of the present application, an IV curve is drawn according to the current value and the voltage value, and the maximum power point of the IV curve is determined, including: calculating the product of the voltage value and the current value at each point, determining the point corresponding to the maximum value in the product as the maximum power point, and determining the maximum value in the product as the maximum output power.

[0067] In some embodiments of the present application, the rated power of a photovoltaic panel is determined according to the model parameters of the photovoltaic panel, including: a model-power comparison table is preset, the model-power comparison table includes several model parameters, and each model parameter is set with a corresponding rated power; based on the model-power comparison table, the corresponding rated power is determined according to the model parameters of the photovoltaic panel.

[0068] In order to determine the rated power of the photovoltaic panel, you first need to create a preset model power comparison table. This comparison table records in detail the different models of photovoltaic panels and their corresponding rated power. The specific steps are as follows:

[0069] Create a model power comparison table: This table will contain a series of PV panel model parameters, each model parameter corresponds to a specific rated power value. For example, the table may contain model numbers such as "PV-1000", "PV-2000", etc., and each model is marked with its rated power, such as "1000W", "2000W", etc.

[0070] Collect the model parameters of photovoltaic panels: In actual applications, each photovoltaic panel will have a unique model identification, which can be a production serial number, model code, etc. This information can usually be found on the label or product manual of the photovoltaic panel.

[0071] Determine the rated power: By consulting the model power comparison table, you can quickly find the corresponding rated power according to the model parameters of the photovoltaic panel. For example, if the model of a photovoltaic panel is "PV-1000", according to the comparison table, you can determine that the rated power of this photovoltaic panel is 1000 watts.

[0072] Application power rating: Once the power rating of a PV panel is determined, this data can be used in system design, performance evaluation, energy output forecasting, etc. The power rating is a key parameter for evaluating PV panel performance and calculating the total output of the system.

[0073] This method allows the rated power of each PV panel to be determined efficiently and accurately, allowing the entire PV system to be optimized and managed.

[0074] In some embodiments of the present application, when the conversion efficiency of the photovoltaic panel is determined based on the maximum output power and the rated power, the conversion efficiency is determined according to the following formula:

[0075]

[0076] Among them, E represents conversion efficiency, Pmax represents maximum output power, and Pe represents rated power.

[0077] In some embodiments of the present application, the temperature coefficient of the photovoltaic panel is determined according to the adjusted temperature value, the adjusted current value and the maximum power voltage value, including: determining the adjusted power value according to the adjusted current value and the maximum power voltage value; determining the initial temperature coefficient corresponding to each adjusted temperature value according to the adjusted power value, the maximum output power value and the adjusted temperature value; calculating the average value of several of the initial temperature coefficients, and setting the average value as the temperature coefficient of the photovoltaic panel.

[0078] To determine the temperature coefficient of a photovoltaic panel, first, the regulated power value is calculated based on the given regulated current value and the maximum power voltage value. The regulated power value is obtained by multiplying the regulated current value with the maximum power voltage value. Next, the regulated power value, the maximum output power value, and the regulated temperature value can be used to determine the initial temperature coefficient corresponding to each regulated temperature value. The initial temperature coefficient is calculated by comparing the difference between the regulated power value and the maximum output power value at a specific temperature. Finally, the calculated initial temperature coefficients are averaged. This average value represents the average trend of the performance change of the photovoltaic panel at different temperatures. This average value is set as the temperature coefficient of the photovoltaic panel, which reflects the rate of change of the power output of the photovoltaic panel when the temperature changes. Through the above steps, the temperature coefficient of the photovoltaic panel can be accurately determined, which is crucial for evaluating the performance of the photovoltaic panel at different ambient temperatures.

[0079] In some embodiments of the present application, the initial temperature coefficient is determined according to the following formula:

[0080]

[0081] Among them, Ai represents the initial temperature coefficient corresponding to the i-th adjustment temperature value, Pti represents the adjustment power value at the i-th adjustment temperature value, Pmax represents the maximum output power, Tti represents the i-th adjustment temperature value, and Tstc represents the photovoltaic panel temperature under standard test conditions.

[0082] In this embodiment, the above formula can be used to determine the initial temperature coefficient corresponding to each adjusted temperature value, that is, the influence of temperature on the output power, and then the average is calculated to determine the final temperature coefficient to ensure the accuracy of the data.

[0083] In some embodiments of the present application, the performance of the photovoltaic panel is evaluated according to the temperature coefficient and conversion efficiency of the photovoltaic panel, including: determining a performance evaluation value of the photovoltaic panel according to the temperature coefficient and conversion efficiency of the photovoltaic panel; grading the performance of the photovoltaic panel according to the performance evaluation value to determine the performance of the photovoltaic panel;

[0084] The performance evaluation value is determined according to the following formula:

[0085] V = q1 × E + q2 × A;

[0086] Among them, V represents the performance evaluation value, q1 represents the conversion efficiency influence weight, E represents the conversion efficiency, q2 represents the temperature coefficient influence weight, and A represents the temperature coefficient.

[0087] The performance evaluation of photovoltaic panels usually involves two key parameters: temperature coefficient and conversion efficiency. The temperature coefficient of a photovoltaic panel indicates the sensitivity of the power output of the photovoltaic panel to changes in temperature. The conversion efficiency refers to the ratio of the maximum actual output power of the photovoltaic panel to its rated power. The higher the conversion efficiency, the better the performance of the photovoltaic panel.

[0088] For example, a high-performance photovoltaic panel may have a low temperature coefficient and high conversion efficiency, while a low-performance photovoltaic panel may have a high temperature coefficient and low conversion efficiency. Through performance evaluation and grading, the stability and efficiency of photovoltaic panels in practical applications can be ensured, thereby improving the performance and economic benefits of the entire photovoltaic system.

[0089] In some embodiments of the present application, the performance of the photovoltaic panel is graded according to the performance evaluation value, including: pre-setting a first preset evaluation value, a second preset evaluation value and a third preset evaluation value, the first preset evaluation value, the second preset evaluation value and the third preset evaluation value increasing in sequence; setting the performance grade of the photovoltaic panel according to the relationship between the performance evaluation value and the first preset evaluation value, the second preset evaluation value and the third preset evaluation value; if the performance evaluation value is less than the first preset evaluation value, setting the performance grade of the photovoltaic panel to the first preset performance grade L1; if the performance evaluation value is greater than or equal to the first preset evaluation value, and the performance evaluation value is less than the second preset evaluation value, setting the performance grade of the photovoltaic panel to the second preset performance grade L2; if the performance evaluation value is greater than or equal to the second preset evaluation value, and the performance evaluation value is less than the third preset evaluation value, setting the performance grade of the photovoltaic panel to the third preset performance grade L3; if the performance evaluation value is greater than or equal to the third preset evaluation value, setting the performance grade of the photovoltaic panel to the fourth preset performance grade L4; and L1<L2<L3<L4.

[0090] It can be seen that by setting the first preset evaluation value, the second preset evaluation value and the third preset evaluation value, the performance of the photovoltaic panel is divided into four levels: L1, L2, L3 and L4, ensuring the rationality and logic of the level division, and facilitating the quantitative evaluation of the performance of the photovoltaic panel. And by using the preset evaluation value, the photovoltaic panel performance evaluation process is simplified and the evaluation efficiency is improved. The preset evaluation value can be adjusted according to actual needs to adapt to different application scenarios and performance requirements.

[0091] like Figure 2 As shown, the present invention also discloses a performance evaluation system for photovoltaic panels, which is used to apply the above-mentioned performance evaluation method for photovoltaic panels, including:

[0092] The environment construction module is configured to construct a test simulation environment for the photovoltaic panel, and the test simulation environment is connected to the control system.

[0093] The control system is connected to the environment construction module and is configured to control the test conditions in the test simulation environment.

[0094] The detection module is configured to detect the current value and voltage value of the photovoltaic panel under the standard test conditions when the test simulation environment is set to the standard test conditions through the control system; it is also configured to detect the adjusted temperature value and the adjusted current value when the temperature of the photovoltaic panel is adjusted through the control system and the voltage value is controlled to be the maximum power voltage value.

[0095] The maximum power determination module is configured to draw an IV curve according to the current value and the voltage value, determine the maximum power point of the IV curve, and determine the maximum power voltage value, the maximum power current value and the maximum output power of the photovoltaic panel corresponding to the maximum power point.

[0096] The analysis module is configured to determine the rated power of the photovoltaic panel according to the model parameters of the photovoltaic panel, determine the conversion efficiency of the photovoltaic panel based on the maximum output power and the rated power; and determine the temperature coefficient of the photovoltaic panel according to the adjustment temperature value, the adjustment current value and the maximum power voltage value.

[0097] The performance evaluation module evaluates the performance of photovoltaic panels based on their temperature coefficient and conversion efficiency.

[0098] The system provided by the present invention can effectively detect the performance of photovoltaic panels under different environmental conditions. The environment construction module can simulate the actual use environment, thereby improving the accuracy and reliability of the test. The control system can accurately control the test conditions to ensure the consistency and comparability of the test results. The detection module can monitor the current and voltage values ​​of the photovoltaic panel in real time, which is convenient for analyzing the working status of the photovoltaic panel. The maximum power determination module accurately determines the maximum output power of the photovoltaic panel by drawing the IV curve, providing key data for performance evaluation. The analysis module can calculate the conversion efficiency and temperature coefficient of the photovoltaic panel based on the test data, and provide quantitative indicators for the performance evaluation of the photovoltaic panel. The performance evaluation module combines the temperature coefficient and conversion efficiency to comprehensively evaluate the performance of the photovoltaic panel, which helps users select and use high-performance photovoltaic panel products.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

[0100] The system provided in the above embodiment is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the modules or steps in the embodiments of the present invention can be decomposed or combined. For example, the modules in the above embodiment can be combined into one module, or further divided into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the modules or steps, and are not regarded as improper limitations of the present invention.

[0101] Those skilled in the art should be able to appreciate that the modules and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software or a combination of the two, and the programs corresponding to the software modules and method steps can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs or any other form of storage medium known in the technical field. In order to clearly illustrate the interchangeability of electronic hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are performed in electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

Claims

1. A method for evaluating the performance of a photovoltaic panel, characterized in that: The method comprises: Constructing a test simulation environment for photovoltaic panels, wherein the test simulation environment is connected to a control system; The test simulation environment is set to standard test conditions through the control system, and the current value and voltage value of the photovoltaic panel are detected under the standard test conditions; Draw an IV curve according to the current value and the voltage value, determine the maximum power point of the IV curve, and determine the maximum power voltage value, the maximum power current value and the maximum output power of the photovoltaic panel corresponding to the maximum power point; Determine the rated power of the photovoltaic panel according to the model parameters of the photovoltaic panel, and determine the conversion efficiency of the photovoltaic panel based on the maximum output power and the rated power; The temperature of the photovoltaic panel is adjusted by a control system, the control voltage value is a maximum power voltage value, the adjustment temperature value and the adjustment current value are detected, and the temperature coefficient of the photovoltaic panel is determined according to the adjustment temperature value, the adjustment current value and the maximum power voltage value; The performance of photovoltaic panels is evaluated based on their temperature coefficient and conversion efficiency.

2. The performance evaluation method for photovoltaic panels according to claim 1, characterized in that: The standard test conditions include: solar radiation intensity of 1000W / m 2 , the photovoltaic panel temperature is 25℃ and the air mass AM is 1.

5.

3. The performance evaluation method for photovoltaic panels according to claim 1, characterized in that: Drawing an IV curve according to the current value and the voltage value, and determining a maximum power point of the IV curve, comprises: The product of the voltage value and the current value at each point is calculated, the point corresponding to the maximum value in the product is determined as the maximum power point, and the maximum value in the product is determined as the maximum output power.

4. The performance evaluation method for photovoltaic panels according to claim 1, characterized in that: Determine the rated power of the photovoltaic panel according to the model parameters of the photovoltaic panel, including: A model power comparison table is preset, and the model power comparison table includes several model parameters, and each model parameter is set with a corresponding rated power; Based on the model power comparison table, the corresponding rated power is determined according to the model parameters of the photovoltaic panel.

5. The performance evaluation method for photovoltaic panels according to claim 1, characterized in that: When the conversion efficiency of the photovoltaic panel is determined based on the maximum output power and the rated power, the conversion efficiency is determined according to the following formula: Among them, E represents conversion efficiency, Pmax represents maximum output power, and Pe represents rated power.

6. The performance evaluation method for photovoltaic panels according to claim 1, characterized in that: Determining the temperature coefficient of the photovoltaic panel according to the adjusted temperature value, the adjusted current value and the maximum power voltage value includes: Determining an adjusted power value according to the adjusted current value and the maximum power voltage value; Determine an initial temperature coefficient corresponding to each adjustment temperature value according to the adjustment power value, the maximum output power value and the adjustment temperature value; An average value of the initial temperature coefficients is calculated, and the average value is set as the temperature coefficient of the photovoltaic panel.

7. The performance evaluation method for photovoltaic panels according to claim 6, characterized in that: The initial temperature coefficient is determined according to the following formula: Among them, Ai represents the initial temperature coefficient corresponding to the i-th adjustment temperature value, Pti represents the adjustment power value at the i-th adjustment temperature value, Pmax represents the maximum output power, Tti represents the i-th adjustment temperature value, and Tstc represents the photovoltaic panel temperature under standard test conditions.

8. The performance evaluation method for photovoltaic panels according to claim 1, characterized in that: The performance of photovoltaic panels is evaluated based on their temperature coefficient and conversion efficiency, including: Determine the performance evaluation value of the photovoltaic panel based on the temperature coefficient and conversion efficiency of the photovoltaic panel; Classifying the performance of the photovoltaic panel according to the performance evaluation value to determine the performance of the photovoltaic panel; The performance evaluation value is determined according to the following formula: V = q1 × E + q2 × A; Among them, V represents the performance evaluation value, q1 represents the conversion efficiency influence weight, E represents the conversion efficiency, q2 represents the temperature coefficient influence weight, and A represents the temperature coefficient.

9. The method for evaluating the performance of a photovoltaic panel according to claim 8, characterized in that: The performance of the photovoltaic panels is graded according to the performance evaluation values, including: A first preset evaluation value, a second preset evaluation value and a third preset evaluation value are preset, and the first preset evaluation value, the second preset evaluation value and the third preset evaluation value increase in sequence; setting a performance level of the photovoltaic panel according to a relationship between the performance evaluation value and the first preset evaluation value, the second preset evaluation value and the third preset evaluation value; If the performance evaluation value is less than the first preset evaluation value, the performance level of the photovoltaic panel is set to the first preset performance level L1; If the performance evaluation value is greater than or equal to the first preset evaluation value, and the performance evaluation value is less than the second preset evaluation value, setting the performance level of the photovoltaic panel to the second preset performance level L2; If the performance evaluation value is greater than or equal to the second preset evaluation value, and the performance evaluation value is less than the third preset evaluation value, then the performance level of the photovoltaic panel is set to the third preset performance level L3; If the performance evaluation value is greater than or equal to the third preset evaluation value, the performance level of the photovoltaic panel is set to a fourth preset performance level L4; and L1<L2<L3<L4.

10. A performance evaluation system for photovoltaic panels, used for applying the performance evaluation method for photovoltaic panels according to any one of claims 1 to 9, characterized in that: The system comprises: An environment construction module, configured to construct a test simulation environment for photovoltaic panels, wherein the test simulation environment is connected to a control system; a control system connected to the environment building module and configured to control test conditions within the test simulation environment; The detection module is configured to detect the current value and voltage value of the photovoltaic panel under the standard test conditions when the test simulation environment is set to the standard test conditions through the control system; and is also configured to detect the adjusted temperature value and the adjusted current value when the temperature of the photovoltaic panel is adjusted through the control system and the voltage value is controlled to be the maximum power voltage value; a maximum power determination module, configured to draw an IV curve according to the current value and the voltage value, determine the maximum power point of the IV curve, and determine the maximum power voltage value, the maximum power current value and the maximum output power of the photovoltaic panel corresponding to the maximum power point; An analysis module is configured to determine the rated power of the photovoltaic panel according to the model parameters of the photovoltaic panel, determine the conversion efficiency of the photovoltaic panel based on the maximum output power and the rated power; and determine the temperature coefficient of the photovoltaic panel according to the adjustment temperature value, the adjustment current value and the maximum power voltage value; The performance evaluation module evaluates the performance of photovoltaic panels based on their temperature coefficient and conversion efficiency.

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