Automatic dust cleaning control method for string-type inverter cooling fan

Abstract

The present application relates to photovoltaic inverter heat dissipation control technical field, disclose a kind of automatic dust removal control method of group string type inverter heat dissipation fan, method includes: collecting fan speed, temperature rise rate, import and export temperature difference, inverter load rate, temperature safety margin and ambient temperature in the operation process of group string type inverter;According to fan speed, temperature rise rate and import and export temperature difference, calculate heat dissipation performance evaluation index;Based on heat dissipation performance evaluation index, whether group string type inverter meets heat dissipation performance degradation condition is judged;If it meets heat dissipation performance degradation condition, then whether current operating state meets trigger dust removal condition is judged according to inverter load rate, temperature safety margin and ambient temperature;When meeting heat dissipation performance degradation condition and trigger dust removal condition simultaneously, dust removal control instruction is generated and issued to target heat dissipation fan to start executing dust removal operation.The present application carries out automatic dust removal control in combination with inverter operating condition and heat dissipation performance degradation feature.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic inverter heat dissipation control technology, specifically to an automatic dust removal control method for the cooling fan of a string inverter. Background Technology

[0002] String inverters are widely used in centralized and distributed photovoltaic power plants. Their internal power devices generate a lot of heat during operation, which is usually cooled by forced air cooling using multiple cooling fans.

[0003] In environments with sandstorms, coastal salt spray, or industrial pollution, dust or pollutants easily accumulate on the blades, protective mesh, and air ducts of cooling fans, leading to a decrease in effective airflow and a gradual degradation of heat dissipation performance. This, in turn, causes power device temperatures to rise, inverters to operate at reduced derating, or even to fail and shut down. Current technologies mostly employ fixed-speed or temperature-based speed control for cooling fans, lacking proactive identification and removal mechanisms for dust accumulation. While some technologies propose self-cleaning through reverse fan rotation, these typically use timed reversal or single-threshold triggering methods, failing to incorporate intelligent decision-making based on inverter operating conditions and heat dissipation performance degradation characteristics, which can easily affect the normal operation of the inverter.

[0004] Therefore, it is necessary to propose an automatic dust removal control method and system for cooling fans based on operating status awareness, applicable to string inverters. Summary of the Invention

[0005] This invention provides an automatic dust removal control method for the cooling fan of a string inverter, which solves the problem that existing dust removal control technologies fail to make intelligent decisions based on the inverter's operating conditions and the characteristics of heat dissipation performance degradation, thus affecting the normal operation of the inverter.

[0006] In a first aspect, the present invention provides an automatic dust removal control method for a string inverter cooling fan, the method comprising: The system collects data on fan speed, temperature rise rate, inlet and outlet temperature difference, inverter load rate, temperature safety margin, and ambient temperature during the operation of the string inverter. It calculates heat dissipation performance evaluation indicators based on these indicators. Based on these indicators, it determines whether the string inverter meets the heat dissipation performance degradation conditions. If the conditions are met, it determines whether the current operating state meets the conditions for triggering dust removal based on the inverter load rate, temperature safety margin, and ambient temperature. When both the heat dissipation performance degradation conditions and the dust removal triggering conditions are met, a dust removal control command is generated and sent to the target cooling fan to begin the dust removal operation.

[0007] The automatic dust removal control method for string inverter cooling fans provided by this invention calculates heat dissipation performance evaluation indicators by collecting fan speed, temperature rise rate, and inlet / outlet temperature difference. This accurately identifies whether the heat dissipation performance has deteriorated, avoiding unfounded dust removal. Furthermore, by combining inverter load rate, temperature safety margin, and ambient temperature, the dust removal trigger conditions are determined. Dust removal is only performed when heat dissipation deteriorates and the operating conditions are safe. This ensures the necessity of dust removal while preventing it from interfering with the normal operation of the inverter. Ultimately, this achieves accurate and safe automated dust removal, improving the reliability of the heat dissipation system without the need for additional hardware.

[0008] In one optional implementation, determining whether a string inverter meets the conditions for heat dissipation performance degradation based on heat dissipation performance evaluation indicators includes: Under normal operating conditions of the string inverter, several sets of heat dissipation performance evaluation index data are continuously collected; the average value and variance of the several sets of heat dissipation performance evaluation index data are calculated; based on the average value and variance, the heat dissipation performance degradation threshold is calculated; if the currently calculated heat dissipation performance evaluation index is less than the heat dissipation performance degradation threshold, then the string inverter is determined to meet the heat dissipation performance degradation condition.

[0009] The automatic dust removal control method for the cooling fan of a string inverter provided by this invention collects multiple sets of heat dissipation performance evaluation indicators under normal cleaning conditions of the inverter, calculates their average value and variance, and dynamically calibrates the heat dissipation performance degradation threshold. Then, the current index is used as the basis for degradation judgment when it is lower than the threshold. It can adapt to different models, operating conditions and environments, accurately distinguish between normal data fluctuations and real heat dissipation degradation caused by dust accumulation, and greatly improve the accuracy and adaptability of heat dissipation performance degradation judgment.

[0010] In one optional implementation, heat dissipation performance evaluation indicators are calculated based on fan speed, temperature rise rate, and inlet / outlet temperature difference, including: The relative coefficient of fan speed is determined by the ratio of the current fan speed to the historical reference speed under the same drive duty cycle; the relative coefficient of temperature rise rate is determined by the ratio of the current temperature rise rate to the temperature rise rate under historical normal operating conditions; the relative coefficient of temperature difference is determined by the ratio of the current inlet and outlet temperature difference to the inlet and outlet temperature difference under historical normal operating conditions; the relative coefficients of fan speed, temperature rise rate, and temperature difference are weighted and summed to obtain the heat dissipation performance evaluation index under the current operating conditions.

[0011] The automatic dust removal control method for the cooling fan of a string inverter provided by this invention obtains the heat dissipation performance evaluation index by calculating the relative coefficient of fan speed, the relative coefficient of temperature rise rate, and the relative coefficient of temperature difference, and then performing a weighted summation. It comprehensively quantifies the heat dissipation capacity from three dimensions: fan mechanical operation status, device temperature rise rate, and system heat exchange efficiency, avoiding the bias of judgment based on a single parameter, making the heat dissipation performance evaluation more comprehensive and accurate, and providing a reliable basis for subsequent degradation judgment.

[0012] In one alternative implementation, the method further includes: Monitor the operating status of the target cooling fan in real time; when an abnormal state is detected, interrupt the dust cleaning operation and issue an alarm.

[0013] The automatic dust removal control method for the cooling fan of a string inverter provided by this invention monitors the operating status of the target cooling fan in real time during the dust removal process. Once an abnormality is detected, the dust removal is immediately interrupted and an alarm is issued. This can effectively prevent the expansion of faults such as fan stall and overload during dust removal, avoid equipment damage or inverter overheating caused by dust removal operation, and improve the safety and equipment operation stability of the entire automatic dust removal process.

[0014] In one optional implementation, determining whether the current operating state meets the conditions for triggering dust removal is based on the inverter load rate, temperature safety margin, and ambient temperature, including: The current ambient temperature of the inverter is obtained. When the inverter load rate, temperature safety margin and ambient temperature all meet their respective threshold conditions, the current operating state is determined to meet the conditions for triggering dust cleaning. The inverter load rate is determined based on the ratio of the current output power to the rated power, and the temperature safety margin is determined based on the inverter's maximum allowable temperature minus the inverter's current operating temperature.

[0015] The automatic dust removal control method for the cooling fan of a string inverter provided by this invention uses three parameters—inverter load rate, temperature safety margin, and ambient temperature—as the dust removal trigger conditions. Dust removal is only allowed when all three parameters meet the threshold. This ensures that the dust removal operation is performed only under safe operating conditions with low load, sufficient temperature margin, and suitable ambient temperature. It avoids temporary decrease in heat dissipation capacity during dust removal, which could lead to inverter overheating or affect normal power generation, and significantly improves the safety and adaptability of automatic dust removal.

[0016] In one alternative implementation, the method further includes: After the target cooling fan completes the cleaning operation, the heat dissipation performance evaluation index after cleaning is calculated. The heat dissipation performance evaluation index before and after cleaning is compared. If the heat dissipation performance evaluation index after cleaning is greater than the heat dissipation performance evaluation index before cleaning, the cleaning operation is deemed valid. If the heat dissipation performance evaluation index after cleaning is less than or equal to the heat dissipation performance evaluation index before cleaning, the cleaning operation is deemed invalid and an alarm is issued.

[0017] The automatic dust removal control method for string inverter cooling fans provided by this invention calculates and compares the heat dissipation performance evaluation indicators before and after dust removal. It can accurately quantify the dust removal effect and clearly determine whether the dust removal is effective. When the dust removal is ineffective, an alarm is issued in time, which can quickly remind the operation and maintenance personnel to intervene manually. This avoids the continuous degradation of heat dissipation due to the accumulation of dust. It forms a complete closed-loop control of dust removal and ensures the long-term stability and reliability of the inverter heat dissipation system.

[0018] Secondly, the present invention provides an automatic dust removal control device for a string inverter cooling fan, the device comprising: The data acquisition module is used to collect data on fan speed, temperature rise rate, inlet and outlet temperature difference, inverter load rate, temperature safety margin, and ambient temperature during the operation of the string inverter. The heat dissipation performance evaluation index calculation module is used to calculate the heat dissipation performance evaluation index based on the fan speed, temperature rise rate and inlet / outlet temperature difference. The heat dissipation performance degradation assessment module is used to determine whether the string inverter meets the heat dissipation performance degradation conditions based on the heat dissipation performance evaluation index. The dust removal condition determination module determines whether the current operating state meets the dust removal condition based on the inverter load rate, temperature safety margin, and ambient temperature. The automatic dust removal module is used to generate a dust removal control command and send it to the target cooling fan to start the dust removal operation when both the heat dissipation performance degradation condition and the dust removal trigger condition are met.

[0019] Thirdly, the present invention provides an electronic device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the automatic dust removal control method for the cooling fan of a string inverter as described in the first aspect or any corresponding embodiment.

[0020] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the automatic dust removal control method for the cooling fan of a string inverter according to the first aspect or any corresponding embodiment described above.

[0021] Fifthly, the present invention provides a computer program product, including computer instructions, which are used to cause a computer to execute the automatic dust removal control method for the cooling fan of a string inverter according to the first aspect or any corresponding embodiment described above. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of an application scenario according to an embodiment of the present invention; Figure 2 This is a flowchart illustrating the automatic dust removal control method for the cooling fan of a string inverter according to an embodiment of the present invention. Figure 3 This is a structural block diagram of an automatic dust removal control device for a string inverter cooling fan according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.

[0026] As an optional application scenario of this invention, the specific application environment architecture or specific hardware architecture on which the automatic dust removal control method for the cooling fan of a string inverter depends is described here. For example... Figure 1 As shown, the architecture system may include at least one terminal device and at least one server. Figure 1 The system is illustrated in the example, which includes a computer 101, a mobile terminal 102, and a server 103, and the terminal devices such as the computer 101 and the mobile terminal 102 are connected to the server 103 through a network 110.

[0027] Specifically, the terminal device can be a smartphone, tablet, laptop, PDA, desktop computer, game console, smart TV, smart wearable device, in-vehicle terminal, VR (Virtual Reality) device, AR (Augmented Reality) device, etc. Server 103 can be a standalone physical server, a server cluster, a distributed system, or a cloud server providing cloud services. Network 110 can be a wired or wireless network, examples of which include, but are not limited to, the Internet, corporate intranet, local area network, wide area network, mobile communication network, and combinations thereof.

[0028] According to an embodiment of the present invention, an embodiment of an automatic dust removal control method for a string inverter cooling fan is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0029] This embodiment provides an automatic dust removal control method for the cooling fan of a string inverter, which can be used in the aforementioned mobile terminals, such as mobile phones and tablets. Figure 2 This is a flowchart of an automatic dust removal control method for a string inverter cooling fan according to an embodiment of the present invention, as shown below. Figure 2 As shown, the process includes the following steps: Step S201: Collect the fan speed, temperature rise rate, inlet and outlet temperature difference, inverter load rate, temperature safety margin, and ambient temperature during the operation of the string inverter.

[0030] In one optional embodiment, the fan speed is the actual number of rotations of the cooling fan per unit time, a direct parameter reflecting the mechanical operating state of the fan, used to determine whether dust accumulation causes the fan speed to decrease. The temperature rise rate is the rate at which the temperature of the inverter's power devices rises over time, i.e., the temperature increase per unit time, directly reflecting the cooling efficiency of the heat dissipation system; the worse the heat dissipation, the faster the temperature rise rate. The inlet and outlet temperature difference is the difference between the inlet and outlet air temperatures of the inverter's cooling duct. The inlet air is the cold air drawn in by the fan, and the outlet air is the hot air after heat removal; the magnitude of the difference reflects the heat exchange capacity of the cooling system. The inverter load rate is used to measure the current power generation load of the inverter. The temperature safety margin is the difference between the maximum allowable operating temperature of the inverter's power devices and the current actual operating temperature; it represents the temperature safety margin for equipment operation.

[0031] Step S202: Calculate the heat dissipation performance evaluation index based on fan speed, temperature rise rate, and inlet / outlet temperature difference.

[0032] In one optional embodiment, the heat dissipation evaluation indicators include the relative coefficient of fan speed, the relative coefficient of temperature rise rate, and the relative coefficient of temperature difference.

[0033] Step S203: Based on the heat dissipation performance evaluation index, determine whether the string inverter meets the heat dissipation performance degradation conditions.

[0034] In one optional embodiment, the heat dissipation performance evaluation index is a quantitative value of heat dissipation capacity. When the index meets the heat dissipation performance degradation condition, it proves that the heat dissipation capacity of the inverter component has decreased significantly.

[0035] In step S204, if the heat dissipation performance degradation condition is met, the current operating state is determined based on the inverter load rate, temperature safety margin, and ambient temperature to determine whether the dust removal trigger condition is met.

[0036] In one optional embodiment, since the fan will briefly reverse its rotation during dust removal, the heat dissipation capacity will temporarily fluctuate, and the process must be performed under safe operating conditions. Therefore, it is necessary to further determine whether the current operating state meets the conditions for triggering dust removal when the heat dissipation performance degradation condition is met.

[0037] Step S205: When both the heat dissipation performance degradation condition and the dust cleaning trigger condition are met, a dust cleaning control command is generated and sent to the target cooling fan to start the dust cleaning operation.

[0038] In one optional embodiment, if the condition of heat dissipation performance degradation is met, it is confirmed that there is real dust accumulation and not a false judgment, thus avoiding ineffective dust removal; if the condition of triggering dust removal is met, it is confirmed that the operating condition is safe and will not damage the inverter; only when both conditions are met can dust removal be performed to remove dust, restore heat dissipation, and ensure that the inverter generates electricity continuously and stably.

[0039] The automatic dust removal control method for string inverter cooling fans provided in this embodiment calculates heat dissipation performance evaluation indicators by collecting fan speed, temperature rise rate, and inlet / outlet temperature difference. This accurately identifies whether the heat dissipation performance has deteriorated, avoiding unfounded dust removal. Furthermore, by combining the inverter load rate, temperature safety margin, and ambient temperature, the dust removal trigger conditions are determined. Dust removal is only performed when heat dissipation deteriorates and the operating conditions are safe. This ensures the necessity of dust removal while preventing it from interfering with the normal operation of the inverter. Ultimately, this achieves accurate and safe automated dust removal, improving the reliability of the heat dissipation system without the need for additional hardware.

[0040] In one optional implementation, determining whether a string inverter meets the conditions for heat dissipation performance degradation based on heat dissipation performance evaluation indicators includes: Step a1: Under the normal operating condition of the string inverter, continuously collect several sets of heat dissipation performance evaluation index data.

[0041] In one optional embodiment, under normal cleaning conditions, N sets of heat dissipation performance evaluation indicators are continuously collected. (i=1,2..,N).

[0042] Step a2: Calculate the average and variance of several sets of heat dissipation performance evaluation index data.

[0043] Step a3: Calculate the heat dissipation performance degradation threshold based on the mean and variance.

[0044] In an alternative embodiment, the heat dissipation performance degradation threshold Calculate as follows:

[0045] in, It is the average value of the heat dissipation performance evaluation index data. It is the variance of the heat dissipation performance evaluation index data, and k can be set according to the station operation strategy.

[0046] Step a4: If the calculated heat dissipation performance evaluation index is less than the heat dissipation performance degradation threshold, then the string inverter is determined to meet the heat dissipation performance degradation condition.

[0047] In one optional embodiment, when the calculated heat dissipation performance evaluation index is less than the heat dissipation performance degradation threshold, it indicates that the heat dissipation performance of the inverter component has significantly degraded and needs to be cleaned.

[0048] The automatic dust removal control method for the cooling fan of a string inverter provided in this embodiment collects multiple sets of heat dissipation performance evaluation indicators under normal cleaning conditions of the inverter, calculates their average value and variance, and dynamically calibrates the heat dissipation performance degradation threshold. Then, the current index is used as the basis for degradation judgment when it is lower than the threshold. It can adapt to different models, operating conditions and environments, accurately distinguish between normal data fluctuations and real heat dissipation degradation caused by dust accumulation, and greatly improve the accuracy and adaptability of heat dissipation performance degradation judgment.

[0049] In one optional implementation, heat dissipation performance evaluation indicators are calculated based on fan speed, temperature rise rate, and inlet / outlet temperature difference, including: Step b1: Determine the relative coefficient of fan speed based on the ratio of the current fan speed to the historical reference speed under the same drive duty cycle.

[0050] Step b2: Determine the relative coefficient of temperature rise rate based on the ratio of the current temperature rise rate to the temperature rise rate under historical normal operating conditions.

[0051] Step b3: Determine the relative coefficient of temperature difference based on the ratio of the current inlet and outlet temperature difference to the inlet and outlet temperature difference under historical normal operating conditions.

[0052] Step b4: Weight the relative coefficients of fan speed, temperature rise rate, and temperature difference to obtain the heat dissipation performance evaluation index under the current operating conditions.

[0053] In an optional embodiment, the heat dissipation performance evaluation index as follows:

[0054] In the formula, This is the current actual fan speed. For the historical reference speed under the same drive duty cycle D, The rate of temperature rise under normal historical heat dissipation conditions. Given the current rate of temperature rise, Intake air temperature, The outlet air temperature, This refers to the temperature difference under actual working conditions. This represents the temperature difference under normal historical operating conditions. ,β,γ These are weighting coefficients, and the proportions are determined based on different practical needs. 1.

[0055] The automatic dust removal control method for the cooling fan of the string inverter provided in this embodiment obtains the heat dissipation performance evaluation index by calculating the relative coefficient of fan speed, the relative coefficient of temperature rise rate, and the relative coefficient of temperature difference, and then performing a weighted summation. It comprehensively quantifies the heat dissipation capacity from three dimensions: fan mechanical operation status, device temperature rise rate, and system heat exchange efficiency, avoiding the bias of judgment based on a single parameter, making the heat dissipation performance evaluation more comprehensive and accurate, and providing a reliable basis for subsequent degradation judgment.

[0056] In an optional embodiment, the automatic dust removal control method for the cooling fan of a string inverter provided in this invention further includes: Step c1: Monitor the operating status of the target cooling fan in real time.

[0057] Step c2: When an abnormal state is detected, the dust cleaning operation is interrupted and an alarm is issued.

[0058] In one optional embodiment, during the dust removal operation, the operating status of the target cooling fan is monitored in real time to identify abnormal conditions such as fan jamming or overload. Once an abnormality is detected, the dust removal operation is immediately interrupted and an alarm is issued to prevent the fan failure from escalating during the dust removal process and to ensure the inverter's heat dissipation safety and stable equipment operation.

[0059] The automatic dust removal control method for the cooling fan of the string inverter provided in this embodiment monitors the operating status of the target cooling fan in real time during the dust removal process. Once an abnormality is detected, the dust removal is immediately interrupted and an alarm is issued. This can effectively prevent the expansion of faults such as fan stall and overload during dust removal, avoid equipment damage or inverter overheating caused by dust removal operation, and improve the safety and equipment operation stability of the entire automatic dust removal process.

[0060] In one optional implementation, determining whether the current operating state meets the conditions for triggering dust removal is based on the inverter load rate, temperature safety margin, and ambient temperature, including: The current ambient temperature of the inverter is obtained. When the inverter load rate, temperature safety margin and ambient temperature all meet their respective threshold conditions, the current operating state is determined to meet the conditions for triggering dust cleaning.

[0061] In an optional embodiment, the inverter load rate is determined based on the ratio of the current output power to the rated power, and the temperature safety margin is determined based on the inverter's maximum allowable temperature minus the inverter's current operating temperature.

[0062] Specifically, given that heat dissipation performance has been determined to have degraded, a dust cleaning operation is permitted if and only if the following conditions are met simultaneously: in, The inverter load factor is P, where P is the rated power. Current output power; Temperature safety margin The highest temperature allowed for the component. The component is currently operating at temperature; The ambient temperature window refers to the safe ambient temperature range within which the cooling fan can be reversed for dust removal. This is the inverter load rate threshold. This refers to the temperature safety margin threshold. This refers to the ambient temperature window threshold. The aforementioned threshold parameters are not fixed constants, but are dynamically determined based on the inverter's design parameters, historical operating data, or operating strategies.

[0063] The automatic dust removal control method for the cooling fan of the string inverter provided in this embodiment uses three parameters—inverter load rate, temperature safety margin, and ambient temperature—as the dust removal trigger conditions. Dust removal is only allowed when all three parameters meet the threshold. This ensures that the dust removal operation is performed only under safe operating conditions with low load, sufficient temperature margin, and suitable ambient temperature. It avoids temporary decrease in heat dissipation capacity during dust removal, which could lead to inverter overheating or affect normal power generation, and greatly improves the safety and adaptability of automatic dust removal.

[0064] In an alternative implementation, the method further includes: Step d1: After the target cooling fan has completed the cleaning operation, calculate the heat dissipation performance evaluation index after cleaning.

[0065] In one optional embodiment, after the target cooling fan completes reverse rotation cleaning, the heat dissipation performance evaluation index is recalculated using the same calculation method as before cleaning. The purpose is to obtain the true and quantitative heat dissipation level of the cooling system after cleaning, provide measured data with a unified benchmark for subsequent effect comparison, ensure that the evaluation dimensions and calculation logic are exactly the same before and after cleaning, and ensure the accuracy of the comparison results.

[0066] Step d2: Compare the heat dissipation performance evaluation index before and after dust cleaning. If the heat dissipation performance evaluation index after dust cleaning is greater than the heat dissipation performance evaluation index before dust cleaning, then the dust cleaning operation is deemed valid.

[0067] In one optional embodiment, the heat dissipation performance evaluation index after cleaning is compared with the index before cleaning. The value of the heat dissipation performance evaluation index directly corresponds to the strength of heat dissipation capacity. If the value is larger after cleaning, it indicates that the dust accumulation on the fan has been effectively removed, the speed and heat exchange efficiency have been restored, the heat dissipation degradation problem has been improved, and the design purpose of automatic cleaning has been achieved. Therefore, the cleaning operation is determined to be effective.

[0068] Step d3: If the heat dissipation performance evaluation index after cleaning is less than or equal to the heat dissipation performance evaluation index before cleaning, the cleaning operation is deemed invalid and an alarm is issued.

[0069] In one optional embodiment, if the index after dust cleaning is less than or equal to that before dust cleaning, it indicates that reverse rotation dust cleaning has not improved the heat dissipation performance and the dust accumulation problem has not been solved, such as dust caking, fan mechanical failure, severe air duct blockage, etc., and automatic dust cleaning has failed. At this time, an alarm prompt is issued to notify the operation and maintenance personnel to intervene manually in a timely manner to avoid the continuous degradation of heat dissipation leading to inverter overheating, derating, or even shutdown failure.

[0070] The automatic dust removal control method for the cooling fan of the string inverter provided in this embodiment calculates and compares the heat dissipation performance evaluation index before and after dust removal. It can accurately quantify the dust removal effect and clearly determine whether the dust removal is effective. When the dust removal is ineffective, an alarm is issued in time, which can quickly remind the operation and maintenance personnel to intervene manually. This avoids the continuous degradation of heat dissipation due to the accumulation of dust. It forms a complete closed-loop control of dust removal and ensures the long-term stability and reliability of the inverter heat dissipation system.

[0071] This embodiment also provides an automatic dust removal control device for the cooling fan of a string inverter. This device is used to implement the above embodiments and preferred embodiments, and will not be repeated as already described. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0072] This embodiment provides an automatic dust removal control device for the cooling fan of a string inverter, such as... Figure 3 As shown, it includes: The data acquisition module 301 is used to collect data on fan speed, temperature rise rate, inlet and outlet temperature difference, inverter load rate, temperature safety margin, and ambient temperature during the operation of the string inverter. The heat dissipation performance evaluation index calculation module 302 is used to calculate the heat dissipation performance evaluation index based on the fan speed, temperature rise rate and inlet / outlet temperature difference. The heat dissipation performance degradation assessment module 303 is used to determine whether the string inverter meets the heat dissipation performance degradation conditions based on the heat dissipation performance evaluation index. The dust removal condition judgment module 304 then determines whether the current operating state meets the dust removal condition based on the inverter load rate, temperature safety margin, and ambient temperature. The automatic dust removal module 305 is used to generate a dust removal control command and send it to the target cooling fan to start the dust removal operation when both the heat dissipation performance degradation condition and the dust removal trigger condition are met simultaneously. The automatic dust removal control device for string inverter cooling fans provided in this embodiment of the invention can execute the automatic dust removal control method for string inverter cooling fans provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method. Further functional descriptions of the above modules and units are the same as in the corresponding embodiments described above, and will not be repeated here.

[0073] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0074] The following is a detailed reference. Figure 4 This diagram illustrates a structural schematic suitable for implementing an electronic device according to embodiments of the present invention. The electronic device may include a processor (e.g., a central processing unit, graphics processor, etc.) 401, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 402 or a program loaded from memory 408 into random access memory (RAM) 403. The RAM 403 also stores various programs and data required for the operation of the electronic device. The processor 401, ROM 402, and RAM 403 are interconnected via a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0075] Typically, the following devices can be connected to I / O interface 405: input devices 406 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 407 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; memory devices 408 including, for example, magnetic tapes, hard disks, etc.; and communication devices 409. Communication device 409 allows electronic devices to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 4 Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown, and more or fewer devices may be implemented or have instead.

[0076] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 409, or installed from a memory 408, or installed from a ROM 402. When the computer program is executed by the processor 401, it performs the functions defined in the automatic dust removal control method for the cooling fan of a string inverter according to embodiments of the present invention.

[0077] Figure 4 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0078] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that the computer, processor, microprocessor controller, or programmable hardware includes storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the automatic dust removal control method for the cooling fan of the string inverter shown in the above embodiments is implemented.

[0079] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0080] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An automatic dust removal control method for a string inverter cooling fan, characterized in that, The method includes: Collect data on fan speed, temperature rise rate, inlet and outlet temperature difference, inverter load rate, temperature safety margin, and ambient temperature during the operation of the string inverter. The heat dissipation performance evaluation index is calculated based on the fan speed, temperature rise rate, and inlet / outlet temperature difference. Based on the aforementioned heat dissipation performance evaluation index, determine whether the string inverter meets the heat dissipation performance degradation conditions. If the heat dissipation performance degradation condition is met, then the current operating state is determined to meet the conditions for triggering dust cleaning based on the inverter load rate, temperature safety margin and ambient temperature. When both the heat dissipation performance degradation condition and the dust cleaning trigger condition are met simultaneously, a dust cleaning control command is generated and sent to the target cooling fan to start the dust cleaning operation.

2. The method according to claim 1, characterized in that, Based on the aforementioned heat dissipation performance evaluation indicators, it is determined whether the string inverter meets the heat dissipation performance degradation conditions, including: Under normal operating conditions of the string inverter, several sets of heat dissipation performance evaluation index data are continuously collected. Calculate the average and variance of the aforementioned sets of heat dissipation performance evaluation index data; Calculate the heat dissipation performance degradation threshold based on the average value and the variance; If the calculated heat dissipation performance evaluation index is less than the heat dissipation performance degradation threshold, then the string inverter is determined to meet the heat dissipation performance degradation condition.

3. The method according to claim 1, characterized in that, The heat dissipation performance evaluation index is calculated based on the fan speed, temperature rise rate, and inlet / outlet temperature difference, including: The relative coefficient of fan speed is determined by the ratio of the current fan speed to the historical reference speed under the same drive duty cycle; The relative coefficient of temperature rise rate is determined by the ratio of the current temperature rise rate to the temperature rise rate under historical normal operating conditions. The relative coefficient of temperature difference is determined based on the ratio of the current inlet and outlet temperature difference to the inlet and outlet temperature difference under historical normal operating conditions. The relative coefficients of fan speed, temperature rise rate, and temperature difference are weighted and summed to obtain the heat dissipation performance evaluation index under the current operating conditions.

4. The method according to claim 1, characterized in that, The method further includes: Real-time monitoring of the operating status of the target cooling fan; When an abnormal state is detected, the dust cleaning operation is interrupted and an alarm is issued.

5. The method according to claim 1, characterized in that, Determine whether the current operating status meets the conditions for triggering dust cleaning based on the inverter load rate, temperature safety margin, and ambient temperature, including: The current ambient temperature of the inverter is obtained. When the inverter load rate, the temperature safety margin, and the ambient temperature all meet their respective threshold conditions, it is determined that the current operating state meets the conditions for triggering dust cleaning. The inverter load rate is determined based on the ratio of the current output power to the rated power, and the temperature safety margin is determined based on the inverter's maximum allowable temperature minus the inverter's current operating temperature.

6. The method according to claim 1, characterized in that, The method further includes: After the target cooling fan completes the dust removal operation, calculate the heat dissipation performance evaluation index after dust removal; Compare the heat dissipation performance evaluation index before and after dust cleaning. If the heat dissipation performance evaluation index after dust cleaning is greater than the heat dissipation performance evaluation index before dust cleaning, then the dust cleaning operation is deemed effective. If the heat dissipation performance evaluation index after cleaning is less than or equal to the heat dissipation performance evaluation index before cleaning, the cleaning operation will be deemed invalid and an alarm will be issued.

7. An automatic dust removal control device for a string inverter cooling fan, characterized in that, The device includes: The data acquisition module is used to collect data on fan speed, temperature rise rate, inlet and outlet temperature difference, inverter load rate, temperature safety margin, and ambient temperature during the operation of the string inverter. The heat dissipation performance evaluation index calculation module is used to calculate the heat dissipation performance evaluation index based on the fan speed, temperature rise rate and inlet / outlet temperature difference. The heat dissipation performance degradation assessment module is used to determine whether the string inverter meets the heat dissipation performance degradation conditions based on the heat dissipation performance evaluation index. The dust removal condition determination module determines whether the current operating state meets the dust removal condition based on the inverter load rate, temperature safety margin, and ambient temperature. The automatic dust removal module is used to generate a dust removal control command and send it to the target cooling fan to start the dust removal operation when both the heat dissipation performance degradation condition and the dust removal trigger condition are met.

8. An electronic device, characterized in that, include: The system includes a memory and a processor, which are interconnected. The memory stores computer instructions, and the processor executes the computer instructions to perform the automatic dust removal control method for the cooling fan of the string inverter as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to execute the automatic dust removal control method for the cooling fan of the string inverter as described in any one of claims 1 to 6.

10. A computer program product, characterized in that, The system includes computer instructions for causing a computer to execute the automatic dust removal control method for the cooling fan of a string inverter as described in any one of claims 1 to 6.

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