A method and apparatus for detecting the health of a photovoltaic inverter's air duct

Abstract

This application discloses a method and apparatus for detecting the health of a photovoltaic (PV) inverter's duct system. First, a health status alarm threshold curve for the duct system is obtained, and the output power range for detection is determined based on the PV inverter's output power. Then, based on the PV inverter's output power, the corresponding first relative temperature is obtained. Finally, the PV inverter's duct system is detected based on the output power range, the corresponding first relative temperature, the PV inverter's preset cutoff power value, and the health status alarm threshold curve, yielding the detection results. As can be seen, this method eliminates the need for on-site inspection of the duct system, enabling quick and simple detection of the PV inverter's duct system, enhancing the PV inverter's continuous operation capability, and thus improving the power plant's operation and maintenance level.

Description

Technical Field

[0001] This application relates to the field of photovoltaic inverter technology, and in particular to a method and apparatus for detecting the health of the air duct of a photovoltaic inverter. Background Technology

[0002] A photovoltaic inverter is a power regulation device composed of semiconductor devices, mainly used to convert DC power into AC power at a commonly used frequency.

[0003] Most photovoltaic (PV) inverters employ air cooling and are typically installed outdoors in harsh natural environments. Air is drawn in through the inverter's inlet and expelled through the outlet, carrying away internal heat through the air duct to maintain a balanced internal temperature. Therefore, dust, sand, willow catkins, and other foreign matter in the air can easily accumulate at the inverter's inlet, blocking the air ducts and causing the inverter to overheat and shut down due to abnormal heat dissipation.

[0004] Currently, the only way to address the problem of clogged air ducts in photovoltaic inverters is through regular inspections by power plant maintenance personnel. This is not only extremely labor-intensive, but also prone to failure and shutdown due to delayed maintenance, resulting in power generation losses. Therefore, conducting health checks on the air ducts of photovoltaic inverters has become an urgent issue that needs to be addressed. Summary of the Invention

[0005] In view of this, embodiments of this application provide a method and apparatus for detecting the air duct health of a photovoltaic inverter, aiming to quickly detect the air duct of a photovoltaic inverter.

[0006] In a first aspect, embodiments of this application provide a method for detecting the health of a photovoltaic inverter's ductwork, the method comprising:

[0007] Obtain the health status alarm threshold curve of the air duct;

[0008] The output power range for testing is determined based on the output power of the photovoltaic inverter.

[0009] Based on the output power of the photovoltaic inverter, the first relative temperature corresponding to the output power is obtained;

[0010] Based on the output power range, the first relative temperature, the preset cutoff power value of the photovoltaic inverter, and the health status alarm threshold curve, the air duct of the photovoltaic inverter is detected to obtain the detection result of the air duct of the photovoltaic inverter.

[0011] Optionally, the step of determining the health status alarm threshold curve includes:

[0012] The health status of the photovoltaic inverter's air duct is obtained based on the blockage area of ​​the air duct, and the health status alarm threshold is determined.

[0013] The second relative temperature is obtained by calculating the difference between the temperature value of the photovoltaic inverter and the temperature value of the air inlet of the photovoltaic inverter's air duct.

[0014] Based on the second relative temperature, the health status of the air duct of the photovoltaic inverter, and the output power of the photovoltaic inverter, a health threshold curve corresponding to the health status of the air duct of the photovoltaic inverter is obtained.

[0015] The health status alarm threshold curve is determined based on the health threshold curve corresponding to the health status of the photovoltaic inverter's air duct and the health status alarm threshold.

[0016] Optionally, the health status of the photovoltaic inverter's air duct includes healthy, sub-healthy, unhealthy, pathological, or faulty.

[0017] Optionally, determining the output power range for detection based on the output power of the photovoltaic inverter includes:

[0018] The output power range for detection is determined based on the maximum power value and a preset quantity in the output power of the photovoltaic inverter.

[0019] Optionally, obtaining the first relative temperature corresponding to the output power based on the output power of the photovoltaic inverter includes:

[0020] Based on the output power within the output power range, obtain the first relative temperature corresponding to the output power within the output power range;

[0021] Based on the output power range, the first relative temperature, the preset cutoff power value of the photovoltaic inverter, and the health status alarm threshold curve, the air duct of the photovoltaic inverter is detected to obtain the detection results of the air duct of the photovoltaic inverter, including:

[0022] Based on the output power range, the first relative temperature corresponding to the output power within the output power range, the preset cutoff power, and the health status alarm threshold curve, the air duct of the photovoltaic inverter is detected to obtain the detection result of the air duct of the photovoltaic inverter.

[0023] Optionally, the step of detecting the air duct of the photovoltaic inverter based on the output power range, the first relative temperature corresponding to the output power within the output power range, the preset cutoff power, and the health status alarm threshold curve, to obtain the detection result of the air duct of the photovoltaic inverter, includes:

[0024] When the preset cutoff power value is less than the minimum power value within the output power range, the air duct of the photovoltaic inverter is detected based on the first relative temperature corresponding to the output power within the output power range and the health status alarm threshold curve, and the detection result is that the air duct is abnormal.

[0025] Optionally, when the preset cutoff power value is less than the minimum power value within the output power range, the air duct of the photovoltaic inverter is detected based on the first relative temperature corresponding to the output power within the output power range and the health status alarm threshold curve, and the detection result is that the air duct is abnormal, including:

[0026] When the preset cutoff power value is less than the minimum power value in the output power range, count the number of curves in the output power range whose first relative temperature exceeds the health status alarm threshold.

[0027] When the quantity is greater than the preset quantity, the detection result is obtained as an air duct abnormality.

[0028] Optionally, after obtaining the detection result of an air duct abnormality when the number is greater than a preset number, the method further includes:

[0029] An alarm for duct abnormalities will be triggered based on the test results.

[0030] Optionally, the method further includes:

[0031] When the preset cutoff power value is greater than the maximum power value, the health status alarm threshold curve is reacquired.

[0032] When the preset cutoff power value is greater than the minimum power value within the output power range, and the preset cutoff power value is less than the maximum power value, the health status alarm threshold curve is reacquired.

[0033] Optionally, the method further includes:

[0034] The detection results are sent to the server via communication.

[0035] Secondly, embodiments of this application provide a duct health detection device for a photovoltaic inverter, the device comprising:

[0036] The acquisition module is used to acquire the health status alarm threshold curve of the air duct;

[0037] The determination module is used to determine the output power range for detection based on the output power of the photovoltaic inverter.

[0038] The module is configured to obtain a first relative temperature corresponding to the output power of the photovoltaic inverter.

[0039] The detection module is used to detect the air duct of the photovoltaic inverter based on the output power range, the first relative temperature, the preset cutoff power value of the photovoltaic inverter and the health status alarm threshold curve, and to obtain the detection result of the air duct of the photovoltaic inverter.

[0040] Thirdly, embodiments of this application provide a duct health monitoring device for a photovoltaic inverter, the device comprising:

[0041] Memory, used to store computer programs;

[0042] A processor is configured to execute the computer program to cause the device to perform the duct health detection method for the photovoltaic inverter described in the first aspect above.

[0043] Fourthly, embodiments of this application provide a computer storage medium on which a computer program is stored. When the computer program is run, the device running the computer program implements the air duct health detection method for photovoltaic inverters described in the first aspect.

[0044] Compared with the prior art, the embodiments of this application have the following beneficial effects:

[0045] This application provides a method and apparatus for detecting the health of a photovoltaic (PV) inverter's duct system. First, a health status alarm threshold curve for the duct system is obtained. Then, the output power range for detection is determined based on the PV inverter's output power. Next, a first relative temperature corresponding to the output power is obtained. Finally, the duct system of the PV inverter is detected based on the output power range, the first relative temperature corresponding to the output power, the preset cutoff power value of the PV inverter, and the health status alarm threshold curve, yielding the detection results. As can be seen, by using the PV inverter's output power range, the first relative temperature corresponding to the output power, the preset cutoff power value, and the health status alarm threshold curve, the duct system of the PV inverter can be detected, and the detection results can be obtained. This method eliminates the need for on-site inspection of the duct system, allowing for quick and simple detection of the PV inverter's duct system, enhancing the continuous operation capability of the PV inverter, and thus improving the operation and maintenance level of the power plant. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings used in the description of the embodiment or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the system framework involved in one application scenario in the embodiments of this application;

[0048] Figure 2 A flowchart illustrating a method for detecting the air duct health of a photovoltaic inverter, provided in an embodiment of this application;

[0049] Figure 3 A schematic diagram showing the equivalent blockage area and operating time of the air duct provided in the embodiments of this application;

[0050] Figure 4 A schematic diagram of the health threshold curve of the air duct provided in the embodiments of this application;

[0051] Figure 5 A schematic diagram of the air duct inspection process provided in an embodiment of this application;

[0052] Figure 6 This is a schematic diagram of the structure of a duct health detection device for a photovoltaic inverter provided in an embodiment of this application. Detailed Implementation

[0053] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0054] Currently, the only way to address the problem of clogged air ducts in photovoltaic inverters is through regular inspections by power plant maintenance personnel. This is not only extremely labor-intensive, but also prone to failure and shutdown due to delayed maintenance, resulting in power generation losses. Therefore, conducting health checks on the air ducts of photovoltaic inverters has become an urgent issue that needs to be addressed.

[0055] Based on this, to solve the above problems, in this embodiment of the application, firstly, the health status alarm threshold curve of the air duct is obtained, and the output power range for detection is determined according to the output power of the photovoltaic inverter. Then, the first relative temperature corresponding to the output power is obtained according to the output power of the photovoltaic inverter. Finally, the air duct of the photovoltaic inverter is detected according to the output power range, the first relative temperature corresponding to the output power, the preset cutoff power value of the photovoltaic inverter, and the health status alarm threshold curve, and the detection result of the photovoltaic inverter air duct is obtained. It can be seen that the air duct of the photovoltaic inverter can be detected and the detection result of the photovoltaic inverter air duct can be obtained according to the output power range of the photovoltaic inverter, the first relative temperature corresponding to the output power, the preset cutoff power value, and the health status alarm threshold curve. The above method eliminates the need for personnel to inspect the air duct on-site, and can quickly and easily detect the air duct of the photovoltaic inverter, enhancing the continuous operation capability of the photovoltaic inverter and thus improving the operation and maintenance level of the power station.

[0056] For example, one scenario in the embodiments of this application can be applied to, such as Figure 1 The scenario shown includes a data acquisition unit 101 and a photovoltaic inverter unit 102. The photovoltaic inverter unit 102 includes the output power and relative temperature value of the photovoltaic inverter. The data acquisition unit 101 uses the implementation method provided in this application embodiment to obtain the output power and relative temperature value of the photovoltaic inverter from the photovoltaic inverter unit 102.

[0057] First, in the above application scenarios, although the action description of the implementation method provided in this application is executed by the data collector 101, the implementation method of this application is not limited in terms of the execution subject, as long as the actions disclosed in the implementation method provided in this application are executed.

[0058] Secondly, the above scenario is only one example provided by the embodiments of this application, and the embodiments of this application are not limited to this scenario.

[0059] The following, in conjunction with the accompanying drawings, describes in detail the specific implementation of the photovoltaic inverter duct health detection method and device in the embodiments of this application.

[0060] See Figure 2 The figure is a flowchart of a method for detecting the air duct health of a photovoltaic inverter according to an embodiment of this application, combined with... Figure 2 As shown, it can specifically include:

[0061] S201: Obtain the health status alarm threshold curve of the air duct.

[0062] The health status alarm threshold can be set manually. The health status of the photovoltaic inverter's air duct can be obtained based on the blockage area of ​​the air duct, and the health status alarm threshold can be determined. The health status of the photovoltaic inverter's air duct can include healthy, sub-healthy, unhealthy, pathological, or faulty.

[0063] See also Figure 3 , Figure 3 This diagram illustrates the equivalent blockage area and operating time of the air duct. From the moment the inverter is first connected to the grid, as the operating time increases, dust, sand, willow catkins, and other abnormal substances continuously accumulate on the surface of the air inlet. The inverter's air duct can be categorized into five states: healthy, sub-healthy, unhealthy, diseased, and faulty. Figure 3 As shown, days 0-D1 represent a healthy state, days D1-D2 a sub-healthy state, days D2-D3 an unhealthy state, days D3-D4 a pathological state, and days after D4 a faulty state. The corresponding critical points are D1, D2, D3, and D4, which are also the threshold points for duct health diagnosis. The health status of the duct can be represented by the equivalent blockage area. Different health states correspond to different critical areas. In one possible implementation, the critical blockage area for sub-health can be S1%, representing slight blockage; the critical blockage area for unhealthiness can be S2%, representing moderate blockage; the critical blockage area for pathological state can be S3%, representing severe blockage; and the critical blockage area for fault can be S4%, representing that the photovoltaic inverter cannot work normally. In this embodiment, the detection mainly targets the health, sub-healthy, unhealthy, and pathological states of the duct. A fault indicates that the photovoltaic inverter has stopped and no detection is required.

[0064] The health status alarm threshold can be freely set; it can be sub-healthy, unhealthy, or pathological. As an example, when sub-health is used as the health status alarm threshold, the inverter will trigger an alarm when the congestion area reaches S1%, so that power plant maintenance personnel can be notified to perform timely maintenance. Of course, this application does not specifically limit the health status alarm threshold, and this does not affect the implementation of the embodiments of this application.

[0065] The health status alarm threshold curve is determined based on the health threshold curve corresponding to the health status and the health status alarm threshold. Firstly, the second relative temperature is obtained by subtracting the temperature value of the photovoltaic inverter from the temperature value of the air inlet of the photovoltaic inverter's duct. Since the module temperature of the photovoltaic inverter is affected by the ambient temperature and output power, under the same output power, the module temperature of the photovoltaic inverter is basically linearly related to the ambient temperature, and the temperature of the air inlet of the duct is approximately the same as the ambient temperature. Therefore, to decouple the influence of the ambient temperature, the second relative temperature can be expressed by Formula 1:

[0066] Δt=t m -t a (Formula 1)

[0067] Among them, t m This represents the actual module temperature value of the photovoltaic inverter, t. a This represents the temperature value at the air inlet of the duct. Then, based on the second relative temperature, the health status of the photovoltaic inverter's duct, and the output power of the photovoltaic inverter, the health threshold curve corresponding to the health status of the photovoltaic inverter's duct can be obtained.

[0068] See Figure 4 , Figure 4 This diagram illustrates the health threshold curve of the air duct. By testing the steady-state value of the second relative temperature at each power value from 1% to 110%, a curve of the second relative temperature and output power can be fitted. During the initial operation of the inverter, the air duct can be considered healthy. The steady-state value of the second relative temperature at each power value from 1% to 110% of the inverter's output power is tested, and a curve of the second relative temperature and output power is fitted, which is the health threshold curve t0. When the blockage area reaches S1%, the steady-state value of the second relative temperature at each power value from 1% to 110% of the inverter's output power is tested. For the steady-state value of the second relative temperature, a second relative temperature-output power curve is fitted, which is the sub-health threshold curve t1. When the blockage area reaches S2%, the steady-state value of the second relative temperature is tested for each power value of the inverter output power from 1% to 110%, and a second relative temperature-output power curve is fitted, which is the unhealthy threshold curve t2. When the blockage area reaches S3%, the steady-state value of the second relative temperature is tested for each power value of the inverter output power from 1% to 110%, and a second relative temperature-output power curve is fitted, which is the pathological threshold curve t3. Finally, the health status alarm threshold curve can be determined based on the health threshold curve corresponding to the health status of the photovoltaic inverter duct and the health status alarm threshold.

[0069] from Figure 4 As can be seen from the duct health threshold curve, the higher the output power, the higher the relative temperature value of the photovoltaic inverter, and the more obvious the fault characteristics. Using the relative module temperature in the high output power range for alarm judgment is less likely to result in missed or false alarms. In one possible implementation, when performing duct health detection on the photovoltaic inverter, the above-mentioned health threshold curve is preset in the data acquisition unit. The sensitivity can be set by the host computer, and different health threshold curves can be loaded. As an example, when sub-health is used as the health status alarm threshold, the sub-health threshold curve t1 is loaded.

[0070] S202: Determine the output power range to be tested based on the output power of the photovoltaic inverter.

[0071] In one possible implementation, the output power range for detection can be determined based on the maximum power value in the output power of the photovoltaic inverter and a preset number.

[0072] Since the data storage period is T per day, and one historical data point is stored per period, the inverter will automatically perform a check once it has gone from operation to shutdown and the DC voltage is lower than the startup voltage. In one possible implementation, the historical data for the day of detection can be sorted by power from smallest to largest to obtain the sorted output power, thereby determining the maximum power value among the output powers.

[0073] In one possible implementation, the preset quantity can be M. Based on the maximum power value, M power values ​​are selected from the sorted output power to determine the output power range of the photovoltaic inverter.

[0074] S203: Obtain the first relative temperature corresponding to the output power based on the output power of the photovoltaic inverter.

[0075] Relative temperature refers to the temperature obtained by calculating the difference between the actual temperature of the photovoltaic inverter and the temperature of the air inlet of the air duct. When obtaining the actual output power of the photovoltaic inverter, the actual temperature corresponding to the output power can also be obtained, thus obtaining the first relative temperature corresponding to the output power.

[0076] In one possible implementation, the first relative temperature corresponding to the output power can be obtained by calculating the difference between the actual temperature of the photovoltaic inverter corresponding to the output power and the temperature of the air inlet of the photovoltaic inverter's air duct.

[0077] In one possible implementation, the horizontal axis represents the output power of the photovoltaic inverter, and the vertical axis represents the relative temperature. Using this coordinate system, the first relative temperature corresponding to the output power can be determined. Based on the output power within a given range, the first relative temperature corresponding to the output power within that range can be determined.

[0078] S204: Based on the output power range, the first relative temperature, the preset cutoff power value of the photovoltaic inverter, and the health status alarm threshold curve, the air duct of the photovoltaic inverter is detected to obtain the detection results of the air duct of the photovoltaic inverter.

[0079] In one possible implementation, the output power range and the preset cutoff power value P of the photovoltaic inverter can be used as a reference. limit The system uses the first relative temperature corresponding to the output power within the output power range and the health status alarm threshold curve to detect the air duct of the photovoltaic inverter, thereby obtaining the detection results of the photovoltaic inverter's air duct. The preset cutoff power value P is used as an example. limitThis indicates that the health status alarm threshold curve below this power value is not included in the health detection of the air duct, and the preset cutoff power value P limit It is fixed. As an example, it can be a fixed 50%. Of course, this application does not specifically limit the preset cutoff power value, and it does not affect the implementation of the embodiments of this application.

[0080] In one possible implementation, when the preset cutoff power value P limit Less than the minimum power value P within the output power range min At that time, the air duct of the photovoltaic inverter can be detected based on the first relative temperature and health status alarm threshold curve corresponding to the output power within the output power range, and the detection result obtained is that the air duct is abnormal.

[0081] See Figure 5 , Figure 5 This is a schematic diagram of the duct inspection process. In one possible implementation, when the preset cutoff power value P... limit Less than the minimum power value P within the output power range min When the weather is clear, it indicates that a health check of the air duct can be performed. The number of curves showing the first relative temperature exceeding the health alarm threshold within the output power range is counted, i.e., the maximum power value P is counted. max Minimum power value P within the output power range min The number of points among M points that are above the health status alarm threshold curve t1. When the number of points whose first relative temperature corresponding to the output power exceeds the health status alarm threshold curve within the output power range is greater than a preset number, the detection result is an air duct abnormality. As an example, when more than 80% of the points whose first relative temperature corresponding to the output power exceeds the health status alarm threshold curve within the output power range, the detection result is an air duct abnormality; that is, 80% of the M points are above the t1 curve, the detection result is an air duct abnormality. Air duct abnormality alarms can be triggered based on the detection results, notifying power plant maintenance personnel before the inverter fails and shuts down, enabling timely repairs, improving the level of intelligent operation and maintenance of the power plant, and enhancing the inverter's continuous operation capability.

[0082] In one possible implementation, when the preset cutoff power value P limit Greater than the maximum power value P max When the light intensity is low, it indicates that a health check of the duct will not be performed. The health status alarm threshold curve can be re-acquired for the next duct health check. When the preset cutoff power value P... limit Greater than the minimum power value P within the output power range min And the preset cutoff power value P limit Less than the maximum power value P maxWhen the weather is cloudy, it indicates that the air duct health test will not be performed. The health status alarm threshold curve can be re-acquired for the next air duct health test.

[0083] Alternatively, the detection results can be sent to the server via communication. For example, the detection results can be sent to the server using the Modbus serial communication protocol or the IEC104 communication protocol. This application does not specifically limit the communication method and does not affect the implementation of the embodiments of this application. Of course, the embodiments of this application can also be applied to centralized, string, and residential inverter products. This application does not specifically limit the product type of the inverter and does not affect the implementation of the embodiments of this application.

[0084] The above describes a method for detecting the air duct health of a photovoltaic inverter, as provided in this application embodiment. First, a health status alarm threshold curve for the air duct is obtained. Then, the output power range for detection is determined based on the output power of the photovoltaic inverter. Next, the first relative temperature corresponding to the output power is obtained. Finally, the air duct of the photovoltaic inverter is detected based on the output power range, the first relative temperature corresponding to the output power, the preset cutoff power value of the photovoltaic inverter, and the health status alarm threshold curve, yielding the detection results. It is evident that by using the output power range, the first relative temperature corresponding to the output power, the preset cutoff power value, and the health status alarm threshold curve, the air duct of the photovoltaic inverter can be detected, and the detection results can be obtained. This method eliminates the need for on-site inspection by personnel, enabling quick and simple detection of the photovoltaic inverter's air duct, enhancing the continuous operation capability of the photovoltaic inverter, and thus improving the operation and maintenance level of the power plant.

[0085] The above are some specific implementations of the air duct health detection method for photovoltaic inverters provided in the embodiments of this application. Based on this, this application also provides a corresponding device. The device provided in the embodiments of this application will be described below from the perspective of functional modularity.

[0086] See Figure 6 The figure is a schematic diagram of the structure of a duct health detection device 600 for a photovoltaic inverter provided in an embodiment of this application. The device 600 may include:

[0087] The acquisition module 601 is used to acquire the health status alarm threshold curve of the air duct;

[0088] The determination module 602 is used to determine the output power range for detection based on the output power of the photovoltaic inverter;

[0089] The module 603 is used to obtain the first relative temperature corresponding to the output power based on the output power of the photovoltaic inverter.

[0090] The detection module 604 is used to detect the air duct of the photovoltaic inverter based on the output power range, the first relative temperature, the preset cutoff power value of the photovoltaic inverter and the health status alarm threshold curve, and to obtain the detection results of the air duct of the photovoltaic inverter.

[0091] In this embodiment, by cooperating with the acquisition module 601, the determination module 602, the obtaining module 603, and the detection module 604, the air duct of the photovoltaic inverter can be detected based on the output power range of the photovoltaic inverter, the first relative temperature corresponding to the output power, the preset cutoff power value, and the health status alarm threshold curve. The detection results of the air duct of the photovoltaic inverter can be obtained. The above method eliminates the need for staff to go to the site to inspect the air duct, and can quickly and easily detect the air duct of the photovoltaic inverter, thereby enhancing the continuous operation capability of the photovoltaic inverter and improving the operation and maintenance level of the power station.

[0092] As one implementation method, the steps for determining the health status alarm threshold curve include:

[0093] The first determining unit is used to obtain the health status of the photovoltaic inverter's air duct based on the blockage area of ​​the air duct, and to determine the health status alarm threshold.

[0094] The first acquisition unit is used to perform a difference calculation based on the temperature value of the photovoltaic inverter and the temperature value of the air inlet of the photovoltaic inverter's air duct to obtain the second relative temperature.

[0095] The first obtaining unit is used to obtain the health threshold curve corresponding to the health status of the photovoltaic inverter's air duct based on the second relative temperature, the health status of the photovoltaic inverter's air duct, and the output power of the photovoltaic inverter.

[0096] The second determining unit is used to determine the health status alarm threshold curve based on the health threshold curve and the health status alarm threshold corresponding to the health status of the photovoltaic inverter's air duct.

[0097] As one implementation method, the health status of the air duct of a photovoltaic inverter includes healthy, sub-healthy, unhealthy, pathological, or faulty.

[0098] As one implementation method, the determining module 602 is specifically used for:

[0099] The output power range to be tested is determined based on the maximum power value and the preset quantity in the output power of the photovoltaic inverter.

[0100] As one implementation, module 603 includes:

[0101] The second obtaining unit is used to obtain the first relative temperature corresponding to the output power within the output power range based on the output power within the output power range.

[0102] Correspondingly, the detection module 604 includes:

[0103] The detection unit is used to detect the air duct of the photovoltaic inverter based on the output power range, the first relative temperature corresponding to the output power within the output power range, the preset cutoff power, and the health status alarm threshold curve, and to obtain the detection results of the air duct of the photovoltaic inverter.

[0104] As one implementation method, the detection module 604 is specifically used for:

[0105] When the preset cutoff power value is less than the minimum power value within the output power range, the air duct of the photovoltaic inverter is detected based on the first relative temperature and health status alarm threshold curve corresponding to the output power within the output power range, and the detection result is that the air duct is abnormal.

[0106] As one implementation, the detection module 604 includes:

[0107] The statistics unit is used to count the number of curves whose first relative temperature exceeds the health state alarm threshold corresponding to the output power within the output power range when the preset cutoff power value is less than the minimum power value within the output power range.

[0108] The third obtaining unit is used to obtain the detection result as an air duct abnormality when the quantity is greater than the preset quantity.

[0109] As one implementation method, the duct health monitoring device 600 for photovoltaic inverters further includes:

[0110] The alarm unit is used to issue alarms for abnormal air duct conditions based on the detection results.

[0111] As one implementation method, the duct health monitoring device 600 for photovoltaic inverters further includes:

[0112] The second acquisition unit is used to reacquire the health status alarm threshold curve when the preset cutoff power value is greater than the maximum power value.

[0113] The third acquisition unit is used to reacquire the health status alarm threshold curve when the preset cutoff power value is greater than the minimum power value in the output power range and the preset cutoff power value is less than the maximum power value.

[0114] As one implementation method, the duct health monitoring device 600 for photovoltaic inverters further includes:

[0115] The sending unit is used to send the detection results to the server via communication.

[0116] This application also provides corresponding devices and computer storage media for implementing the solutions provided in this application.

[0117] The device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to enable the device to perform the duct health detection method for photovoltaic inverters according to any embodiment of this application.

[0118] The computer storage medium stores a computer program. When the code is run, the device running the computer program implements the air duct health detection method for photovoltaic inverters according to any embodiment of this application.

[0119] In the embodiments of this application, the terms "first" and "second" (if they exist) are used only as name identifiers and do not represent the order of first and second.

[0120] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the methods of the above embodiments can be implemented by means of software plus a general-purpose hardware platform. Based on this understanding, the technical solution of this application can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as a read-only memory (ROM) / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network communication device such as a router) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0121] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiments. The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate. The components indicated as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment solution according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0122] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for detecting the health of a photovoltaic inverter's air duct, characterized in that, The method includes: Obtain the health status alarm threshold curve of the air duct; The output power range for testing is determined based on the output power of the photovoltaic inverter. Based on the output power of the photovoltaic inverter, the first relative temperature corresponding to the output power is obtained; Based on the output power range, the first relative temperature, the preset cutoff power value of the photovoltaic inverter, and the health status alarm threshold curve, the air duct of the photovoltaic inverter is detected to obtain the detection result of the air duct of the photovoltaic inverter. The step of determining the output power range for detection based on the output power of the photovoltaic inverter includes: The output power range for detection is determined based on the maximum power value and a preset quantity in the output power of the photovoltaic inverter.

2. The method according to claim 1, characterized in that, The steps for determining the health status alarm threshold curve include: The health status of the photovoltaic inverter's air duct is obtained based on the blockage area of ​​the air duct, and the health status alarm threshold is determined. The second relative temperature is obtained by calculating the difference between the temperature value of the photovoltaic inverter and the temperature value of the air inlet of the photovoltaic inverter's air duct. Based on the second relative temperature, the health status of the air duct of the photovoltaic inverter, and the output power of the photovoltaic inverter, a health threshold curve corresponding to the health status of the air duct of the photovoltaic inverter is obtained. The health status alarm threshold curve is determined based on the health threshold curve corresponding to the health status of the photovoltaic inverter's air duct and the health status alarm threshold.

3. The method according to claim 2, characterized in that, The health status of the photovoltaic inverter's air duct includes healthy, sub-healthy, unhealthy, diseased, or faulty.

4. The method according to claim 1, characterized in that, The step of obtaining the first relative temperature corresponding to the output power of the photovoltaic inverter includes: Based on the output power within the output power range, obtain the first relative temperature corresponding to the output power within the output power range; Based on the output power range, the first relative temperature, the preset cutoff power value of the photovoltaic inverter, and the health status alarm threshold curve, the air duct of the photovoltaic inverter is detected to obtain the detection results of the air duct of the photovoltaic inverter, including: Based on the output power range, the first relative temperature corresponding to the output power within the output power range, the preset cutoff power, and the health status alarm threshold curve, the air duct of the photovoltaic inverter is detected to obtain the detection result of the air duct of the photovoltaic inverter.

5. The method according to claim 4, characterized in that, The step of detecting the air duct of the photovoltaic inverter based on the output power range, the first relative temperature corresponding to the output power within the output power range, the preset cutoff power, and the health status alarm threshold curve, and obtaining the detection result of the air duct of the photovoltaic inverter, includes: When the preset cutoff power value is less than the minimum power value within the output power range, the air duct of the photovoltaic inverter is detected based on the first relative temperature corresponding to the output power within the output power range and the health status alarm threshold curve, and the detection result is that the air duct is abnormal.

6. The method according to claim 5, characterized in that, When the preset cutoff power value is less than the minimum power value within the output power range, the air duct of the photovoltaic inverter is detected based on the first relative temperature corresponding to the output power within the output power range and the health status alarm threshold curve, and the detection result is that the air duct is abnormal, including: When the preset cutoff power value is less than the minimum power value in the output power range, count the number of curves in the output power range whose first relative temperature exceeds the health status alarm threshold. When the quantity is greater than the preset quantity, the detection result is obtained as an air duct abnormality.

7. The method according to claim 6, characterized in that, After obtaining the detection result of air duct abnormality when the number is greater than a preset number, the method further includes: An alarm for duct abnormalities will be triggered based on the test results.

8. The method according to any one of claims 3 to 7, characterized in that, The method further includes: When the preset cutoff power value is greater than the maximum power value, the health status alarm threshold curve is reacquired. When the preset cutoff power value is greater than the minimum power value within the output power range, and the preset cutoff power value is less than the maximum power value, the health status alarm threshold curve is reacquired.

9. The method according to claim 1, characterized in that, The method further includes: The detection results are sent to the server via communication.

10. A duct health detection device for a photovoltaic inverter, characterized in that, The device includes: The acquisition module is used to acquire the health status alarm threshold curve of the air duct; The determination module is used to determine the output power range for detection based on the output power of the photovoltaic inverter. The module is configured to obtain a first relative temperature corresponding to the output power of the photovoltaic inverter. The detection module is used to detect the air duct of the photovoltaic inverter based on the output power range, the first relative temperature, the preset cutoff power value of the photovoltaic inverter and the health status alarm threshold curve, and to obtain the detection result of the air duct of the photovoltaic inverter. Specifically, the determining module determines the output power range for detection based on the output power of the photovoltaic inverter. Specifically, it is used to determine the output power range for detection based on the maximum power value and a preset quantity in the output power of the photovoltaic inverter.

11. A duct health detection device for a photovoltaic inverter, characterized in that, The device includes: Memory, used to store computer programs; A processor for executing the computer program to cause the device to perform the steps of the duct health detection method for a photovoltaic inverter as described in any one of claims 1 to 9.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the air duct health detection method for a photovoltaic inverter as described in any one of claims 1 to 9.

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