Heat dissipation control method of photovoltaic inverter, controller and photovoltaic inverter

Abstract

The invention discloses a heat dissipation control method of a photovoltaic inverter, a controller and the photovoltaic inverter, and the method comprises the steps: carrying out the self-inspection of a heat dissipation fan during starting, and determining an operation mode of the photovoltaic inverter after the self-inspection is passed; in the default mode, the service life of the photovoltaic inverter is guaranteed preferentially, and the operation power of the photovoltaic inverter is adjusted according to the internal temperature change condition; in the first operation mode, the photovoltaic benefit is guaranteed preferentially, the upper limit value of the working temperature of the photovoltaic inverter is increased, and the operation power of the photovoltaic inverter is adjusted according to the change condition of the internal temperature; in the second operation mode, control is carried out according to the silent operation time period, and the rotating speed of the cooling fan is adjusted according to the internal temperature change condition in the silent operation time period; and in the third operation mode, full-silence operation is achieved, the cooling fan is controlled to stop rotating, and the operation power of the cooling fan is adjusted according to the internal temperature change condition. According to the embodiment of the invention, heat dissipation control operation can be carried out according to different modes, so that user requirements are met.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic inverter applications, and particularly to a heat dissipation control method, a controller, and a photovoltaic inverter for a photovoltaic inverter. Background Art

[0002] A photovoltaic inverter can achieve power conversion of a photovoltaic system. As the photovoltaic inverter gradually develops towards high-voltage and high-power conversion technologies, the heat generation of the photovoltaic inverter is also increasing continuously, making it difficult to meet the requirements of product heat dissipation. Therefore, a cooling fan is often installed inside the photovoltaic inverter to evenly disperse the heat inside the device through the cooling fan, so as to prevent local overheating inside the device and cause device damage.

[0003] Currently, the operation of the cooling fan will generate noise. In the scenario where the installation location of the photovoltaic inverter is close to the user's living area, the noise of the cooling fan inside the photovoltaic inverter is easily transmitted to the user, affecting the user experience. Summary of the Invention

[0004] Embodiments of the present application provide a heat dissipation control method, a controller, and a photovoltaic inverter for a photovoltaic inverter, which can control the operation of the cooling fan according to different modes, thereby meeting the user's needs.

[0005] In a first aspect, an embodiment of the present application provides a heat dissipation control method for a photovoltaic inverter, including: performing self-check on the cooling fan when the photovoltaic inverter is started, and determining the currently set operation mode of the photovoltaic inverter after the self-check passes;

[0006] When the operation mode is the default mode, controlling the cooling fan to start at the maximum speed, and adjusting the operation power of the photovoltaic inverter according to the change of the internal temperature of the photovoltaic inverter;

[0007] When the operation mode is the first operation mode, controlling the cooling fan to operate at the maximum speed, increasing the upper limit value of the working temperature of the photovoltaic inverter, and adjusting the operation power of the photovoltaic inverter according to the change of the internal temperature of the photovoltaic inverter;

[0008] When the operation mode is the second operation mode, detecting the currently set silent operation time period, if the current moment is within the silent operation time period, controlling the cooling fan to operate at a speed lower than the maximum speed, and adjusting the speed of the cooling fan according to the change of the internal temperature of the photovoltaic inverter;

[0009] When the operation mode is the third operation mode, controlling the cooling fan to stop rotating, and adjusting the operation power of the photovoltaic inverter according to the change of the internal temperature of the photovoltaic inverter;

[0010] Among them, the default mode represents the operation mode with priority given to the lifespan of the PV inverter; the first operation mode represents the operation mode with priority given to the user's PV income; the second operation mode represents the operation mode where the user sets to mute by time period, and the third operation mode represents the operation mode where the user sets to be fully muted.

[0011] In some embodiments, the first operation mode represents the operation mode with priority given to the user's PV income; the second operation mode represents the operation mode where the user sets to mute by time period, and the third operation mode represents the operation mode where the user sets to be fully muted.

[0012] In some embodiments, after self-checking the cooling fan when the PV inverter starts up, the cooling control method further includes:

[0013] When the self-check of the cooling fan fails, a fan fault prompt is issued;

[0014] The power upper limit value of the PV inverter is lowered, and the operating power of the PV inverter is adjusted according to the change in the internal temperature of the PV inverter.

[0015] In some embodiments, adjusting the operating power of the PV inverter according to the change in the internal temperature of the PV inverter includes:

[0016] Obtain the internal temperature of the PV inverter;

[0017] When the internal temperature of the PV inverter exceeds the upper limit of the working temperature, continuously reduce the operating power of the PV inverter over time, and record the operating power before the reduction.

[0018] When the operating power of the PV inverter has been continuously reduced for a first period of time, or when the internal temperature of the PV inverter drops to a temperature threshold, set the power upper limit value to be less than the operating power recorded before the reduction, and continuously increase the operating power of the PV inverter over time;

[0019] Re-obtain the internal temperature of the PV inverter.

[0020] In some embodiments, continuously reducing the operating power of the PV inverter over time includes:

[0021] Reduce the operating power of the PV inverter at a first rate, where the first rate is the power change value per minute;

[0022] Continuously increasing the operating power of the PV inverter over time includes:

[0023] Increase the operating power of the PV inverter at a second rate, where the second rate is the power change value per minute;

[0024] Wherein, the first rate is greater than the second rate.

[0025] In some embodiments, continuously increasing the operating power of the PV inverter over time includes:

[0026] When the operating power of the PV inverter increases to the power upper limit value, monitor the internal temperature of the PV inverter within a second duration;

[0027] When the internal temperature of the PV inverter does not exceed the upper limit of the operating temperature within the second duration, control the PV inverter to operate at the current operating power.

[0028] In some embodiments, when the operating mode is the second operating mode, controlling the cooling fan to operate at a speed lower than the maximum speed includes:

[0029] Start the cooling fan at a first speed and continue for a third duration;

[0030] When the internal temperature of the PV inverter rises within the third duration, increase the first speed to a second speed and continue for a fourth duration;

[0031] When the internal temperature of the PV inverter rises within the fourth duration, increase the second speed to the maximum speed.

[0032] In some embodiments, adjusting the speed of the cooling fan according to the change in the internal temperature of the PV inverter includes:

[0033] When the internal temperature of the PV inverter is stable and does not exceed the upper limit of the operating temperature, maintain the operating power of the PV inverter and reduce the speed of the cooling fan;

[0034] When the internal temperature of the PV inverter rises within a fifth duration after reducing the speed of the cooling fan, increase the speed of the cooling fan;

[0035] When the internal temperature of the PV inverter does not rise within a fifth duration after reducing the speed of the cooling fan, continue to reduce the speed of the cooling fan.

[0036] In some embodiments, the heat dissipation control method further includes:

[0037] After the self - inspection of the cooling fan passes, detect the internal temperature of the PV inverter;

[0038] When the internal temperature of the PV inverter is greater than the fan start temperature value, control the cooling fan to start according to the currently set operating mode of the PV inverter.

[0039] In a second aspect, an embodiment of the present application provides a controller, including at least one processor and a memory communicatively connected to the at least one processor; the memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor is enabled to execute the heat dissipation control method as described in the first aspect.

[0040] In a third aspect, an embodiment of the present application provides a photovoltaic inverter, including the controller of the second aspect.

[0041] The heat dissipation control method, controller and photovoltaic inverter of the embodiments of the present application have at least the following beneficial effects: The photovoltaic inverter of the embodiments of the present application can set multiple operation modes, and the user can set the operation mode according to their own needs to control the heat dissipation strategy of the photovoltaic inverter; in the default mode, it starts at the maximum speed of the cooling fan and can automatically adjust the operating power of the photovoltaic inverter during operation. This mode is the automatically adjusted heat dissipation strategy, which can give priority to ensuring the life of the photovoltaic inverter. In the first operation mode, it starts at the maximum speed of the cooling fan and sets that the photovoltaic inverter can exceed the default upper limit of the operating temperature, and then adjusts the operating power according to the actual internal temperature subsequently. This mode is the mode with priority given to photovoltaic benefits. In the second operation mode, the speed of the cooling fan is reduced according to the set silent time period. This mode is the user's time-period silent mode, which reduces the noise during the silent period. In the third operation mode, the cooling fan is kept stopped to avoid the photovoltaic inverter from making noise. This mode is the completely silent mode. Therefore, the multiple operation modes provided by the photovoltaic inverter, with different heat dissipation controls based on the multiple operation modes, can meet the user's needs.

[0042] Other features and advantages of the present application will be described in the subsequent specification, and part of them will become obvious from the specification or be understood by implementing the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures specifically pointed out in the specification, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a flowchart of the heat dissipation control method of the photovoltaic inverter provided by an embodiment of the present invention;

[0044] Figure 2 is a flowchart of the heat dissipation control method provided by another embodiment of the present invention;

[0045] Figure 3 is a flowchart of adjusting the operating power of the photovoltaic inverter according to the change of the internal temperature of the photovoltaic inverter provided by the embodiment of the present application;

[0046] Figure 4Yes Figure 3 is the flowchart of the specific method for step S302;

[0047] Figure 5 Yes Figure 3 is the flowchart of the specific method for step S303;

[0048] Figure 6 Yes Figure 3 is another flowchart of the specific method for step S303;

[0049] Figure 7 is the flowchart of the heat dissipation control method provided by another embodiment of the present invention;

[0050] Figure 8 Yes Figure 1 is another flowchart of the specific method for step S104;

[0051] Figure 9 is the flowchart of adjusting the rotation speed of the cooling fan according to the internal temperature change of the photovoltaic inverter provided by the embodiment of the present application;

[0052] Figure 10 is the flowchart of the fan self-check method provided by an example of the present application;

[0053] Figure 11 is the flowchart of the heat dissipation control method provided by an example of the present application;

[0054] Figure 12 is the flowchart of adjusting the operating power of the photovoltaic inverter by the temperature loop provided by an example of the present application;

[0055] Figure 13 is the schematic diagram of the controller provided by an embodiment of the present application. Detailed implementation manners

[0056] In order to make the purpose, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be adjusted or reordered in an obvious manner by those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment and do not mean that they are the necessary sequences, unless it is stated that a certain sequence must be followed.

[0057] In the description of this application, "several" means one or more, "multiple" means more than two. Understandings such as "greater than", "less than", "exceeding", etc. do not include the base number, and understandings such as "above", "below", "within", etc. include the base number. If it is described as "first", "second", etc., it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0058] The serial numbers assigned to components in this article, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in this application, unless otherwise specified, both include direct and indirect connection (coupling).

[0059] As one of the key technologies of photovoltaic inverters, power conversion technology is gradually moving towards high-voltage and high-power conversion technology. With the continuous increase in voltage levels, the commonly used hard-switching conversion technology has low efficiency, and the heat generation of power devices is also increasing continuously, making it difficult to meet the requirements of product heat dissipation and the user's requirements for energy throughput rate. Therefore, cooling fans are often installed in photovoltaic inverters to evenly disperse the heat inside the equipment to prevent local overheating inside the equipment and cause equipment damage.

[0060] At the same time, residential photovoltaic inverters are increasingly favored by users, and the installed capacity is getting larger and larger. The cooling fan plays a crucial role in the heat dissipation of photovoltaic inverters. Therefore, ensuring whether the cooling fan can operate normally is the key to extending the life of photovoltaic inverters. And residential photovoltaic inverters are increasingly developing towards the direction of household appliances, being installed indoors and against the wall outdoors, getting closer and closer to the user's living area. However, residential photovoltaic inverters often install fans for heat dissipation, but the startup and operation of the fans are the sources of noise in photovoltaic inverters. Especially at large air volumes and speeds, the noise is more serious. Especially at night when it is quiet, the noise is easily transmitted to users and affects the users' rest.

[0061] Based on this, the embodiments of the present application provide a heat dissipation control method, a controller, and a photovoltaic inverter for a photovoltaic inverter. The heat dissipation control method, the controller, and the photovoltaic inverter of the embodiments of the present application have at least the following beneficial effects: The photovoltaic inverter of the embodiments of the present application can set multiple operating modes, and the user can set the operating mode according to their own needs and then control the heat dissipation strategy of the photovoltaic inverter; in the default mode, it starts at the maximum speed of the cooling fan and can automatically adjust the operating power of the photovoltaic inverter during operation. This mode is the automatically adjusted heat dissipation strategy, which can give priority to ensuring the life of the photovoltaic inverter. In the first operating mode, it starts at the maximum speed of the cooling fan and sets that the photovoltaic inverter can exceed the default upper limit of the operating temperature, and then adjusts the operating power according to the actual internal temperature subsequently. This mode is the mode with priority given to photovoltaic benefits. In the second operating mode, it reduces the speed of the cooling fan according to the set silent time period. This mode is the user's time-period silent mode, which reduces the noise during the silent period. In the third operating mode, it keeps the cooling fan stopped to avoid the photovoltaic inverter from making noise. This mode is the completely silent mode. Therefore, the multiple operating modes provided by the photovoltaic inverter and different heat dissipation controls based on multiple operating modes can meet the user's needs.

[0062] The following will explain the heat dissipation control method, the controller, and the photovoltaic inverter for a photovoltaic inverter with reference to the accompanying drawings:

[0063] As Figure 1 shown, Figure 1 is a flowchart of the heat dissipation control method for a photovoltaic inverter provided by an embodiment of the present invention. The control method includes but is not limited to steps S101 to S105.

[0064] Step S101: When the photovoltaic inverter starts, perform self-check on the cooling fan, and determine the currently set operating mode of the photovoltaic inverter after the self-check passes;

[0065] In some embodiments, when the photovoltaic inverter starts, perform self-check on the cooling fan, determine whether the fan can operate normally after power-on, and determine the currently set operating mode of the photovoltaic inverter after the self-check passes, so as to perform different heat dissipation controls according to different operating modes of the photovoltaic inverter subsequently.

[0066] It should be noted that the self-check operation on the cooling fan includes checking whether the motor of the cooling fan is operating normally. For example, checking the rotation speed, rotation direction, etc. of the motor; checking whether the power cord of the cooling fan is correct, checking for potential safety hazards such as leakage, checking the heat dissipation effect of the cooling fan, etc. This embodiment does not make specific limitations.

[0067] It should be noted that after the self-check passes, the operating power of the PV inverter can reach the rated power. When the self-check fails, the PV inverter issues a fan fault alarm, generates an alarm signal to prompt the staff to replace the normal cooling fan, and then performs a self-check on the replaced cooling fan. After the self-check passes, the current operating mode set by the PV inverter is determined, which will be specifically described below.

[0068] Step S102, when the operating mode is the default mode, control the cooling fan to start at the maximum speed, and adjust the operating power of the PV inverter according to the change of the internal temperature of the PV inverter;

[0069] In some embodiments, when the operating mode is the default mode, the fan control method takes the lifespan of the inverter as the priority index. Since the fan self-check passes and the maximum operating power of the PV inverter can reach the rated power, control the cooling fan to start at the maximum speed, and adjust the operating power of the PV inverter according to the change of the internal temperature of the PV inverter, that is, adjust the operating power of the PV inverter according to the temperature loop, so as to ensure that the PV inverter operates within a suitable working temperature range, improve the efficiency and performance of the inverter, effectively reduce the working temperature of the inverter, and extend the lifespan of the inverter.

[0070] Step S103, when the operating mode is the first operating mode, control the cooling fan to run at the maximum speed, increase the upper limit value of the working temperature of the PV inverter, and adjust the operating power of the PV inverter according to the change of the internal temperature of the PV inverter;

[0071] In some embodiments, when the operating mode is the first operating mode, this mode is an operating mode that gives priority to the maximum PV gain set by the user. Control the cooling fan to run at the maximum speed. At this time, the inverter operates at the actual maximum power, increase the upper limit value of the working temperature of the PV inverter, so that the PV inverter can exceed the default upper limit of the working temperature, and adjust the operating power of the PV inverter according to the change of the internal temperature of the PV inverter, that is, control the operating power of the PV inverter through the temperature loop, and increase the upper limit of the working temperature of the PV inverter, which can improve the power generation efficiency of the PV inverter, thereby increasing the power generation of the PV system. By increasing the power generation, the total revenue of the PV system will also increase accordingly.

[0072] It should be noted that when the operating mode is the first operating mode, the cooling fan will start running at the maximum speed, the inverter will operate at the actual maximum power, and the upper limit value of the operating temperature of the inverter will be increased to 105% of the rated value. After running continuously for a period of time, if the temperature rise does not reach the limit value, it will keep running normally. If the internal temperature of the PV inverter changes beyond the machine temperature limit value, the operating power of the PV inverter will be adjusted according to the change of the internal temperature of the PV inverter, so as to keep the PV inverter running smoothly while increasing the total revenue of the PV system.

[0073] It can be understood that in the first operating mode, the upper limit value of the operating temperature is 105% of the rated value. For example, if the rated value is 60 degrees Celsius, the upper limit value of the operating temperature is 63 degrees Celsius; if the rated value is 50 degrees Celsius, the upper limit value of the operating temperature is 51.5 degrees Celsius, etc. This embodiment does not make specific limitations.

[0074] Step S104, when the operating mode is the second operating mode, detect the currently set silent operation time period. If the current moment is within the silent operation time period, control the cooling fan to run at a speed lower than the maximum speed, and adjust the speed of the cooling fan according to the change of the internal temperature of the PV inverter;

[0075] In some embodiments, when the operating mode is the second operating mode, this mode is an operating mode with time-period-based silent operation set by the user. Detect the currently set silent operation time period. If the current moment is within the silent operation time period, control the cooling fan to run at a speed lower than the maximum speed, reduce the noise generated by the cooling fan during the silent operation time period, and adjust the speed of the cooling fan according to the change of the internal temperature of the PV inverter, so that while the power remains unchanged, the fan speed can be dynamically adjusted to the speed balance state according to the speed loop to reduce the noise generated by the fan.

[0076] It should be noted that if the current moment is not within the silent operation time period, first control the cooling fan to run at the maximum speed, and then adjust the operating power of the PV inverter and / or the speed of the cooling fan according to the change of the internal temperature of the PV inverter, that is, control the inverter and the cooling fan to run according to the default mode. For example, first control the cooling fan to run at the maximum speed. Suppose after a period of time, the temperature does not reach the temperature limit value, while the power remains unchanged, on the premise of ensuring that the temperature rise does not exceed the temperature limit value, the fan speed is dynamically adjusted to the speed balance state according to the speed loop to reduce the noise generated by the fan. Suppose after a period of time, the temperature still rises until the machine temperature limit value is reached, then the fan keeps running at the maximum speed, and the machine starts to control the anti-reverse to reduce the power according to the temperature loop until the temperature is balanced.

[0077] Step S105, when the operating mode is the third operating mode, control the cooling fan to stop rotating, and adjust the operating power of the PV inverter according to the change of the internal temperature of the PV inverter.

[0078] In some embodiments, when the operating mode is the third operating mode, which is a completely silent operating mode set for the user at this time, control the cooling fan to stop rotating, and adjust the operating power of the PV inverter according to the change of the internal temperature of the PV inverter to ensure that the temperature inside the inverter is lower than the temperature limit value and avoid the PV inverter from making noise.

[0079] It should be noted that the time period in the second operating mode can be set according to the needs of the staff. For example, the quiet time period can be set from 10:00 p.m. to 7:00 a.m., from 8:00 p.m. to 8:00 a.m., from 8:00 a.m. to 12:00 noon, etc. This embodiment does not make specific limitations.

[0080] It should be noted that the default mode represents the operating mode with priority given to the life of the PV inverter; the first operating mode represents the operating mode with priority given to the PV income of the user; the second operating mode represents the operating mode with the user-set time-period silent, and the third operating mode represents the operating mode with the user-set full silent.

[0081] As Figure 2 shown, Figure 2 is a flowchart of a heat dissipation control method provided by another embodiment of the present invention. It includes but is not limited to steps S201 to S202.

[0082] It should be noted that steps S201 to S202 occur after the self-check of the cooling fan when the PV inverter is started.

[0083] Step S201, when the self-check of the cooling fan fails, issue a fan fault prompt;

[0084] In some embodiments, when the self-check of the cooling fan fails, issue a fan fault prompt to remind the staff to replace the cooling fan and realize the replacement of the faulty fan.

[0085] It should be noted that the fan fault prompt can be a voice prompt, an indicator light prompt, etc. This embodiment does not make specific limitations. After the user replaces the new cooling fan, the new cooling fan is self-checked again, which is not elaborated in this embodiment.

[0086] Step S202, lower the power upper limit value of the PV inverter, and adjust the operating power of the PV inverter according to the change of the internal temperature of the PV inverter.

[0087] In some embodiments, when the self-check of the cooling fan fails, the PV inverter will continuously give a fan fault prompt. Although the PV inverter can operate, its maximum operating power value will be reduced. In this embodiment, the power upper limit value of the PV inverter will be lowered to give priority to ensuring the lifespan of the PV inverter. The operating power of the PV inverter is adjusted according to the internal temperature change of the PV inverter, so as to improve the stability of the PV inverter while ensuring its lifespan and ensure that the PV inverter operates within a suitable working temperature range.

[0088] It should be noted that in this embodiment, the power upper limit value of the PV inverter is lowered to n% of the rated power (n can take 70%-90%). For example, the maximum power of a 10kW PV inverter restricted to operate is 8kW, or the maximum power of a 10kW PV inverter restricted to operate is 9kW, and so on.

[0089] Refer to Figure 3 , Figure 3 is a flowchart for adjusting the operating power of the PV inverter according to the internal temperature change of the PV inverter provided by the embodiment of the present application, including but not limited to steps S301 to S304.

[0090] Step S301: Obtain the internal temperature of the PV inverter;

[0091] Step S302: When the internal temperature of the PV inverter exceeds the working temperature upper limit value, continuously reduce the operating power of the PV inverter over time, and record the operating power before the reduction.

[0092] Step S303: When the operating power of the PV inverter continues to decrease for the first duration, or when the internal temperature of the PV inverter drops to the temperature threshold, set the power upper limit value to be less than the operating power recorded before the reduction, and continuously increase the operating power of the PV inverter over time.

[0093] Step S304: Re-obtain the internal temperature of the PV inverter.

[0094] In steps S301 to S304 of some embodiments, during the process of adjusting the operating power of the photovoltaic inverter according to the internal temperature change of the photovoltaic inverter, first, the internal temperature of the photovoltaic inverter is obtained. When the internal temperature of the photovoltaic inverter exceeds the upper limit of the operating temperature, the operating power of the photovoltaic inverter is continuously reduced over time, so as to obtain the change in the operating power of the photovoltaic inverter when it exceeds the upper limit of the operating temperature, and the operating power before the reduction of the operating power is recorded for subsequent adjustment of the power of the photovoltaic inverter. When the operating power of the photovoltaic inverter is continuously reduced for a first duration, or when the internal temperature of the photovoltaic inverter drops to a temperature threshold, the reduction of the operating power can be stopped and the power reduction mode can be exited. The power upper limit value is set to be less than the operating power recorded before the reduction of the operating power, and the operating power of the photovoltaic inverter is continuously increased over time, so as to increase the operating power of the photovoltaic inverter when the operating power is stable, further improve the efficiency and performance of the photovoltaic inverter. Finally, the internal temperature of the photovoltaic inverter is obtained again to realize the real-time adjustment of the operating power of the photovoltaic inverter, keep the inverter working within the safe temperature range, improve the stability and reliability of the system, and extend the service life of the equipment.

[0095] It should be noted that the first duration can be set by the staff according to their needs. For example, the first duration can be set to 20 minutes, 15 minutes, 10 minutes, or 5 minutes, etc. The upper limit value of the operating temperature and the temperature threshold can be set according to the device parameters of the photovoltaic inverter. For example, the upper limit value of the operating temperature can be set to 60 °C, 70 °C, 55 °C, etc., and the temperature threshold can be set to 30 °C, 40 °C, 35 °C, etc. This embodiment does not make specific limitations.

[0096] It is worth noting that during the process of setting the power upper limit value, first, the operating power before the reduction of the operating power is determined, and then the maximum operating power of the photovoltaic inverter is adjusted to m% of the previous maximum operating power to set the power upper limit value and reduce its heat output. Since too high a temperature will damage the electronic components of the photovoltaic inverter and thus shorten its service life. In this embodiment, by setting the power upper limit value with the operating power recorded before the reduction, its service life can be effectively extended.

[0097] Among them, when the operating mode is the default mode, m can take a value of 75 - 90%; when the operating mode is the first operating mode, m takes a value of 90%. This embodiment does not make specific limitations.

[0098] Refer to Figure 4 , Figure 4 is Figure 3 the flowchart of the specific method for step S302 in

[0099] Step S401, reduce the operating power of the PV inverter at the first rate;

[0100] It should be noted that the first rate is the power change value per minute;

[0101] In some embodiments, during the process of continuously reducing the operating power of the PV inverter over time, the operating power of the PV inverter is reduced at the first rate, so as to obtain the change in the operating power of the PV inverter when it exceeds the upper limit of the working temperature. And by reducing the operating power of the PV inverter at the first rate, its heat output can be reduced, thereby effectively reducing the temperature of the PV inverter and improving the stability and reliability of the PV system.

[0102] Refer to Figure 5 , Figure 5 is Figure 3 the flowchart of the specific method for step S303 in

[0103] Step S402, increase the operating power of the PV inverter at the second rate,

[0104] In some embodiments, during the process of continuously increasing the operating power of the PV inverter over time, the operating power of the PV inverter is increased at the second rate, so as to further improve the efficiency and performance of the PV inverter when the operating power is stable.

[0105] It should be noted that the second rate is the power change value per minute, and the first rate is greater than the second rate. Among them, the first rate can be in the rate range of 0.2kW / min - 0.5kW / min, and the second rate can be in the rate range of 0.1kW / min - 0.3kW / min. For example, when the first rate is 0.2kW / min, the second rate can be 0.1kW / min; when the first rate is 0.4kW / min, the second rate can be 0.2kW / min, etc. This embodiment does not make specific limitations.

[0106] Refer to Figure 6 , Figure 6 is Figure 3 another flowchart of the specific method for step S303 in

[0107] Step S501, when the operating power of the PV inverter increases to the power upper limit value, monitor the internal temperature of the PV inverter within the second duration;

[0108] Step S502: When the internal temperature of the PV inverter within the second time period does not exceed the upper limit of the operating temperature, control the PV inverter to operate at the current operating power.

[0109] In steps S501 to S502 of some embodiments, during the process of continuously increasing the operating power of the PV inverter over time, when the operating power of the PV inverter increases to the power upper limit value, monitor the internal temperature of the PV inverter within the second time period, so as to facilitate subsequent judgment on whether the PV inverter can operate stably under the power upper limit value. When the internal temperature of the PV inverter within the second time period does not exceed the upper limit of the operating temperature, it indicates that the temperature of the PV inverter can remain stable under this power condition, and then control the PV inverter to operate at the current operating power, so as to ensure the normal operation of the system and maximize the efficiency and benefits of the system.

[0110] It should be noted that when the operating power of the PV inverter has not increased to the power upper limit value and the internal temperature of the PV inverter exceeds the upper limit of the operating temperature, repeat steps S301 to S304 until the temperature balance of the PV inverter is reached, and the power of the PV inverter is adjusted and operated accordingly.

[0111] It is worth noting that in the case where the operating mode is the first operating mode, the upper limit of the operating temperature can be adjusted to 105% of the rated value.

[0112] It can be understood that the second time period can be set by the staff according to their needs. For example, the second time period can be set to 5 minutes, 10 minutes, 2 minutes, etc., and this embodiment does not make specific limitations.

[0113] As Figure 7 shown, Figure 7 is a flowchart of a heat dissipation control method provided by another embodiment of the present invention. It includes but is not limited to steps S601 to S602.

[0114] Step S601: After the self-check of the cooling fan passes, detect the internal temperature of the PV inverter;

[0115] Step S602: When the internal temperature of the PV inverter is greater than the fan start temperature value, control the cooling fan to start according to the current set operating mode of the PV inverter.

[0116] In some embodiments, after the self-check of the cooling fan passes, at this time, the temperature sensor of the PV inverter monitors the temperature inside the machine in real time. When the internal temperature of the PV inverter is greater than the fan start temperature value, control the cooling fan to start according to the current set operating mode of the PV inverter.

[0117] It should be noted that the fan start temperature value can be set according to the user's needs within the temperature range of 55°C to 65°C. For example, the fan start temperature value can be 58°C, 60°C, 62°C, etc. There is no specific limitation in this embodiment.

[0118] It can be understood that when the user does not set the operation mode, the photovoltaic inverter operates in the default mode.

[0119] Referring to Figure 8 , Figure 8 is Figure 1 Another flowchart of the specific method for step S104 in

[0120] Step S701, start the cooling fan at the first speed and continue for the third duration;

[0121] Step S702, when the internal temperature of the photovoltaic inverter rises within the third duration, increase the first speed to the second speed and continue for the fourth duration;

[0122] Step S703, when the internal temperature of the photovoltaic inverter rises within the fourth duration, increase the second speed to the maximum speed.

[0123] In steps S701 to S703 of some embodiments, when the operation mode is the second operation mode and the cooling fan is controlled to operate below the maximum speed, first, start the cooling fan at the first speed and continue for the third duration, and monitor the temperature change of the photovoltaic inverter during the third duration. When the internal temperature of the photovoltaic inverter rises within the third duration, it indicates that the current speed of the cooling fan is too low, resulting in poor heat dissipation effect of the photovoltaic inverter. Then, it is necessary to increase the first speed to the second speed and continue for the fourth duration, and continuously monitor the internal temperature change of the photovoltaic inverter. When the internal temperature of the photovoltaic inverter rises within the fourth duration, it indicates that the second speed is still too low, and the insufficient speed of the cooling fan causes the internal temperature of the photovoltaic inverter to continue to rise. It is necessary to increase the second speed to the maximum speed. Increasing the fan speed can enhance the heat dissipation effect, quickly discharge the heat, thereby reducing the internal temperature of the inverter, avoiding thermal damage to components, and extending the service life of the equipment.

[0124] It should be noted that the maximum speed, the second speed, and the first speed increase in sequence. Among them, in this embodiment, the first speed is half of the maximum speed, the second speed is three - quarters of the maximum speed, and the third duration and the fourth duration can be set according to the actual needs of the user. For example, the third duration can be set to 10 minutes, 5 minutes, etc., and the fourth duration can be set to 5 minutes, 8 minutes, etc. The third duration and the fourth duration can be the same or different, and there is no specific limitation in this embodiment.

[0125] Reference Figure 9 , Figure 9 is a flowchart for adjusting the speed of a cooling fan according to the internal temperature change of a photovoltaic inverter provided by an embodiment of the present application, including but not limited to steps S801 to S803.

[0126] Step S801: When the internal temperature of the photovoltaic inverter is stable and does not exceed the upper limit of the operating temperature, maintain the operating power of the photovoltaic inverter and reduce the speed of the cooling fan;

[0127] Step S802: When the internal temperature of the photovoltaic inverter rises within the fifth time period after reducing the speed of the cooling fan, increase the speed of the cooling fan;

[0128] Step S803: When the internal temperature of the photovoltaic inverter does not rise within the fifth time period after reducing the speed of the cooling fan, continue to reduce the speed of the cooling fan.

[0129] In steps S801 to S803 of some embodiments, when the internal temperature of the photovoltaic inverter is stable and does not exceed the upper limit of the operating temperature, it indicates that the current heat dissipation of the photovoltaic inverter is normal. Then, maintain the operating power of the photovoltaic inverter, reduce the speed of the cooling fan, reduce the energy consumption of the cooling fan, and reduce the energy loss. When the internal temperature of the photovoltaic inverter rises within the fifth time period after reducing the speed of the cooling fan, it indicates that the internal temperature of the photovoltaic inverter is too high and the heat dissipation effect is not good. Then, it is necessary to increase the speed of the cooling fan to reduce the internal temperature of the photovoltaic inverter. When the internal temperature of the photovoltaic inverter does not rise within the fifth time period after reducing the speed of the cooling fan, continue to reduce the speed of the cooling fan. By adjusting the fan speed through the speed loop, the operating state of the fan can be controlled according to the actual heat dissipation requirements, avoiding unnecessary energy consumption. In the case of lower temperature or lighter load, the cooling fan can operate at a lower speed, saving energy and extending the service life of the fan.

[0130] It should be noted that by adjusting the fan speed through the speed loop, the internal temperature of the photovoltaic inverter can be maintained within a suitable range, avoiding the influence of overheating or overcooling on electronic components, and improving the stability and reliability of the system. And the operating state of the fan can be adjusted according to the internal temperature change of the photovoltaic inverter, providing a more accurate heat dissipation effect.

[0131] In order to more clearly and understandably explain the above heat dissipation control method, controller and photovoltaic inverter of the photovoltaic inverter, the following will be described with specific examples.

[0132] Example 1:

[0133] Example 1 is a method example for self-checking the cooling fan, which specifically includes the following steps.

[0134] ReferenceFigure 10 , Figure 10 is a flowchart of a self-check method provided by an example of this application, including but not limited to steps S1 to S11.

[0135] Step S1: Power on and start the PV inverter.

[0136] Step S2: The cooling fan is powered on and runs for self-check.

[0137] Step S3: Determine whether the cooling fan is running normally.

[0138] Step S4: When the self-check of the cooling fan passes, the PV inverter operates normally.

[0139] Step S5: Determine the current operating mode set by the PV inverter.

[0140] Step S6: When the self-check of the cooling fan fails, the PV inverter issues a fan fault alarm.

[0141] Step S7: Determine whether the cooling fan has been replaced.

[0142] Step S8: If the cooling fan has been replaced, the fault is eliminated and the PV inverter operates normally.

[0143] Step S9: If the cooling fan has not been replaced, continue to issue a fan fault alarm.

[0144] Step S10: Lower the power upper limit value of the PV inverter and limit the maximum operating power value of the PV inverter to n% of the rated power.

[0145] Step S11: The PV inverter performs dynamic regulation according to the temperature loop control method to determine the operating power.

[0146] In some embodiments, when the PV inverter is powered on, the cooling fan is first self-checked to determine whether the fan is normal. The control logic is as follows: when the self-check passes, the operating power of the PV inverter can reach the rated power. When the self-check fails, the PV inverter issues a fan fault alarm, indicating that a normal fan needs to be replaced. If the user asks the installer to replace the normal fan and the fault is eliminated, it can operate in the normal mode after the self-check passes. Otherwise, by default, the PV inverter will continuously issue a fan fault alarm. Although the PV inverter can operate, the maximum operating power value will be reduced and limited to n% of the rated power (n can take 70% - 90%), for example, the maximum operating power of a 10kW PV inverter is limited to 8kW, giving priority to ensuring the life of the inverter.

[0147] It can be understood that the specific process of adjusting the operating power of the PV inverter through the temperature loop in step S11 will be specifically described in Example 3, and will not be elaborated in this embodiment.

[0148] Example 2:

[0149] Example 2 is a specific example of the heat dissipation control method for a photovoltaic inverter, including the following steps.

[0150] Refer to Figure 11 , Figure 11 which is a flowchart of the heat dissipation control method provided by an example of this application, including but not limited to steps S13 to S36.

[0151] It should be noted that Example 2 occurs after the cooling fan passes the self-check.

[0152] Step S13: Determine whether the temperature of the cooling fan reaches the temperature limit value T3;

[0153] Step S14: When the temperature of the cooling fan reaches the temperature limit value T3, turn on the cooling fan and determine the currently set operating mode of the photovoltaic inverter;

[0154] Step S15: In the case where the operating mode is the default mode, control the cooling fan to start at the maximum speed;

[0155] Step S16: Determine whether the internal temperature of the photovoltaic inverter exceeds the upper limit value of the operating temperature;

[0156] It should be noted that when the internal temperature of the photovoltaic inverter is stable and does not exceed the upper limit value of the operating temperature, maintain the operating power of the photovoltaic inverter;

[0157] Step S18: When the internal temperature of the photovoltaic inverter exceeds the upper limit value of the operating temperature, continuously reduce the operating power of the photovoltaic inverter over time and record the operating power before the reduction;

[0158] Step S19: The photovoltaic inverter performs dynamic adjustment according to the temperature loop control method to determine the operating power;

[0159] Step S20: In the case where the operating mode is the first operating mode, control the cooling fan to operate at the maximum speed;

[0160] Step S21: Increase the upper limit value of the operating temperature of the photovoltaic inverter, and adjust the upper limit value of the operating temperature T2 to 105% of the rated value T1;

[0161] Step S22: Determine whether the internal temperature of the photovoltaic inverter exceeds the upper limit value of the operating temperature;

[0162] Step S23: When the internal temperature of the photovoltaic inverter exceeds the upper limit value of the operating temperature, continuously reduce the operating power of the photovoltaic inverter over time and record the operating power before the reduction;

[0163] Step S24: The PV inverter performs dynamic adjustment according to the temperature loop control method to determine the operating power;

[0164] Step S25: When the operating mode is the second operating mode, detect the currently set silent operation time period;

[0165] Step S26: Determine whether the current time reaches the silent operation time period;

[0166] Step S27: If the current time is within the silent operation time period, start the cooling fan at the first speed and continue for the third duration;

[0167] Step S28: Determine whether the internal temperature of the PV inverter rises within the third duration;

[0168] Step S29: When the internal temperature of the PV inverter rises within the third duration, increase the first speed to the second speed and continue for the fourth duration;

[0169] Step S30: When the internal temperature of the PV inverter is stable within the third duration, maintain the operating power of the PV inverter, reduce the speed of the cooling fan, and adjust the speed of the cooling fan according to the speed loop until the temperature is balanced;

[0170] Step S31: Determine whether the internal temperature of the PV inverter rises within the fourth duration;

[0171] Step S32: When the internal temperature of the PV inverter rises within the fourth duration, increase the second speed to the maximum speed;

[0172] Step S33: The cooling fan operates at the maximum speed, and the PV inverter reduces power according to the temperature loop until the temperature is balanced;

[0173] Step S34: When the internal temperature of the PV inverter is stable within the fourth duration, maintain the operating power of the PV inverter, reduce the speed of the cooling fan, and adjust the speed of the cooling fan according to the speed loop until the temperature is balanced;

[0174] Step S35: If the current time is not within the silent operation time period, the PV inverter and the cooling fan operate and are controlled in the default mode;

[0175] Step S36: When the operating mode is the third operating mode, control the cooling fan to stop rotating;

[0176] Step S37: Control the PV inverter to reduce power according to the temperature loop until the temperature is balanced.

[0177] In some embodiments, when the self-check of the cooling fan passes, the maximum operating power of the PV inverter can reach the rated power. The temperature sensor of the PV inverter monitors the temperature inside the machine in real time. When the temperature reaches the temperature limit value T3 (T3 can be taken as 55 - 65 °C) at which the fan starts, the fan needs to be turned on.

[0178] When the cooling fan needs to be turned on, the inverter will detect the user's set target. If the user has not set it, it is the default mode. The cooling fan will start running at the maximum speed, and the PV inverter will operate at the actual maximum power. After running for a period of time, if the temperature rise does not reach the limit value, it will keep running normally. If the temperature still exceeds the machine temperature limit value, the fan will keep running at the maximum speed, and the machine will operate in the temperature loop control mode until the temperature is balanced. Example three will specifically describe the control method of the temperature loop, and this embodiment will not be elaborated here.

[0179] In the first operating mode, when the cooling fan needs to be turned on and the PV inverter detects that the target user setting is to prioritize maximum revenue, the fan will start running at the maximum speed, and the PV inverter will operate at the actual maximum power. The temperature limit value T2 is adjusted to 105% of the rated value T1. After running for a period of time, if the temperature rise does not reach the limit value, it will keep running normally. If the temperature still exceeds the machine temperature limit value, the cooling fan will keep running at the maximum speed, and the machine will operate in the temperature loop control mode. In different temperature loop controls, the maximum operating power adjustment coefficient m takes a value of 90%, and the temperature limit value is adjusted to 105% of the rated value until the temperature is balanced.

[0180] In the second operating mode, when the cooling fan needs to be turned on and the PV inverter detects that the target user setting is to prioritize quietness, it will detect the quiet time period that meets the user's requirements and determine whether it reaches the quiet time period by recording data through cloud data or the clock inside the inverter. If it is not a specific time period (such as 8:00 - 20:00), the fan will start running at the maximum speed first. If after running for a period of time, the temperature does not reach the temperature limit value, while the power remains unchanged and on the premise of ensuring that the temperature rise does not exceed the temperature limit value, the fan speed will be dynamically adjusted to the speed balance state according to the speed loop to reduce the noise brought by the fan. If after a period of time, the temperature still rises until it reaches the machine temperature limit value, the fan will keep running at the maximum speed, and the machine will start to reduce the power according to the temperature loop control to prevent reverse until the temperature is balanced.

[0181] When the cooling fan needs to be turned on and it reaches the quiet time period set by the customer (such as 20:00 - 8:00), the fan is controlled to run at 1 / 2 of the maximum speed first to reduce the temperature inside the machine. If after a period of time, the temperature inside the machine no longer rises and the power remains unchanged, while ensuring that the temperature rise does not exceed the temperature limit value, the fan speed is dynamically adjusted to the speed balance state according to the speed loop to reduce the noise generated by the fan. If after a period of time, the temperature inside the machine still rises, the fan is controlled to run at 3 / 4 of the maximum speed. When the temperature inside the machine no longer rises and the power remains unchanged, the fan speed is dynamically adjusted to the speed balance state according to the speed loop to reduce the noise generated by the fan. If after a period of time, the temperature inside the machine still rises, the fan is controlled to run at the maximum speed, and at this time the noise of the fan is the largest.

[0182] In the third operating mode, when the user determines the full silent mode, the fan is controlled not to turn on at this time, and the machine reduces the power through the temperature loop control method to ensure that the temperature inside the inverter is lower than the temperature limit value.

[0183] It should be noted that the working mode of the speed loop is that when the internal temperature of the photovoltaic inverter is stable and does not exceed the upper limit of the working temperature, the operating power of the photovoltaic inverter is maintained and the speed of the cooling fan is reduced; when the internal temperature of the photovoltaic inverter rises within the fifth time period after reducing the speed of the cooling fan, the speed of the cooling fan is increased; when the internal temperature of the photovoltaic inverter does not rise within the fifth time period after reducing the speed of the cooling fan, the speed of the cooling fan is continued to be reduced.

[0184] Example 3:

[0185] Example 3 is a specific example of adjusting the operating power of the photovoltaic inverter through the temperature loop.

[0186] Refer to Figure 12 , Figure 12 is a flowchart of adjusting the operating power of the photovoltaic inverter through the temperature loop provided by an example of this application, including but not limited to steps S39 to S48.

[0187] Step S39: The photovoltaic inverter enters the power limit adjustment mode;

[0188] Step S41: Reduce the operating power of the photovoltaic inverter within the time of t1 (the slope is k1), and the machine temperature drops;

[0189] Step S42: Determine whether the internal temperature of the photovoltaic inverter has dropped to the temperature threshold;

[0190] Step S43: When the internal temperature of the photovoltaic inverter drops to the temperature threshold, adjust the maximum operating power to m% of the previous maximum operating power (m can take 75 - 90%), and increase the power at a slope of k2;

[0191] Step S44: Determine whether the internal temperature of the PV inverter reaches the temperature limit value T1;

[0192] Step S45: When the internal temperature of the PV inverter does not reach the temperature limit value T1, determine whether the operating power of the PV inverter is increased to the power upper limit value;

[0193] Step S46: When the operating power of the PV inverter is increased to the power upper limit value, monitor the internal temperature of the PV inverter within the second time period;

[0194] Step S47: Determine whether the internal temperature of the PV inverter within the second time period reaches the temperature limit value T1;

[0195] Step S48: When the internal temperature of the PV inverter within the second time period does not exceed the working temperature upper limit value, control the PV inverter to operate at the current operating power.

[0196] In some embodiments, during the process of adjusting the operating power of the PV inverter through the temperature loop, the power is reduced within the time t1 (the slope is k1), and the machine temperature drops. Note that t1 is set to 10 min, and k1 can be taken as 0.2 - 0.5 kW / min; when it drops to the lower limit of the temperature threshold, the power reduction mode is exited; the power is increased at the slope k2 (k2 can be taken as 0.1 kW - 0.3 kW / min), and the maximum operating power is adjusted to m% of the previous maximum operating power (m can be taken as 75 - 90%); when the maximum operating power is reached, it runs for the time t2, and the temperature rise does not increase and does not exceed the temperature limit value. At this time, the machine temperature is stable, and the machine operates at this power segment.

[0197] When the maximum operating power is not reached and the temperature rise has exceeded the temperature limit value, repeat Step S39 to Step S48 until the temperature balance is achieved, and the power operates according to the adjustment.

[0198] Adjusting the operating power of the PV inverter through the temperature loop can keep the inverter working within a safe temperature range, effectively improving the stability and reliability of the PV system. Reducing the energy loss of the system, thereby improving the efficiency and economy of the PV system.

[0199] As Figure 13 shown, Figure 13 is a schematic diagram of the controller 1000 provided by an embodiment of the present application.

[0200] The controller 1000 of the embodiment of the present application includes one or more processors 1001 and a memory 1002, Figure 13 Taking one processor 1001 and one memory 1002 as an example.

[0201] The processor 1001 and the memory 1002 can be connected through a bus or other means. Figure 13 Taking the connection through the bus as an example.

[0202] The memory 1002, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory 1002 can include high-speed random access memory, and can also include non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory 1002 optionally includes a memory 1002 that is remotely disposed relative to the processor 1001, and these remote memories can be connected to the controller 1000 through a network. Examples of the above networks include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0203] Those skilled in the art can understand that Figure 13 The device structure shown in the figure does not constitute a limitation on the controller 1000, and may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0204] The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory can include high-speed random access memory, and can also include non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory optionally includes a memory that is remotely disposed relative to the processor, and these remote memories can be connected to the processor through a network. Examples of the above networks include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0205] The non-transitory software programs and instructions required to implement the heat dissipation control method of the above embodiments are stored in the memory, and when executed by the processor, the above embodiments are executed.

[0206] In addition, the embodiment of the present application also provides a photovoltaic inverter, which includes the above-mentioned controller, so as to be able to execute the above-mentioned heat dissipation control method, bringing the same technical effects as the above-mentioned heat dissipation control method, and the details of this embodiment will not be described herein again.

[0207] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, that is, they may be located in one place, or may be distributed to multiple network nodes. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0208] In addition, an embodiment of the present application further provides a computer-readable storage medium storing computer-executable instructions that are executed by a processor or a controller 1000.

[0209] Those of ordinary skill in the art will appreciate that all or some of the steps and systems disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, a communication medium typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery medium.

[0210] It should be understood that in the present application, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the association relationship of associated objects and indicates that three relationships may exist. For example, "A and / or B" may mean: only A exists, only B exists, and both A and B exist at the same time. Among them, A and B may be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one (one)" or similar expressions thereof refer to any combination of these items, including any combination of single items (ones) or plural items (ones). For example, at least one (one) of a, b, or c may mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c may be single or multiple.

[0211] In several embodiments provided by the present application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of apparatuses or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0212] It should also be understood that the various implementation manners provided by the embodiments of the present application can be arbitrarily combined to achieve different technical effects.

[0213] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above implementation manners. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present application, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present application.

Claims

1. A heat dissipation control method for a photovoltaic inverter, characterized in that The method includes: When the photovoltaic inverter starts up, perform self-check on the cooling fan, and after the self-check passes, determine the currently set operating mode of the photovoltaic inverter; When the operating mode is the default mode, control the cooling fan to start at the maximum speed, and adjust the operating power of the photovoltaic inverter according to the change of the internal temperature of the photovoltaic inverter; When the operating mode is the first operating mode, control the cooling fan to operate at the maximum speed, increase the upper limit value of the working temperature of the photovoltaic inverter, and adjust the operating power of the photovoltaic inverter according to the change of the internal temperature of the photovoltaic inverter; When the operating mode is the second operating mode, detect the currently set silent operation time period. If the current time is within the silent operation time period, control the cooling fan to operate at a speed lower than the maximum speed, and adjust the speed of the cooling fan according to the change of the internal temperature of the photovoltaic inverter; When the operating mode is the third operating mode, control the cooling fan to stop rotating, and adjust the operating power of the photovoltaic inverter according to the change of the internal temperature of the photovoltaic inverter; Among them, the default mode represents the operating mode with priority given to the life of the photovoltaic inverter; the first operating mode represents the operating mode with priority given to the photovoltaic income of the user; the second operating mode represents the operating mode where the user sets silent operation by time period, and the third operating mode represents the operating mode where the user sets full silent operation.

2. The heat dissipation control method according to claim 1, wherein After performing self-check on the cooling fan when the photovoltaic inverter starts up, the cooling control method further includes: When the self-check of the cooling fan fails, issue a fan failure prompt; Lower the power upper limit value of the photovoltaic inverter, and adjust the operating power of the photovoltaic inverter according to the change of the internal temperature of the photovoltaic inverter.

3. The heat dissipation control method according to claim 1 or 2, wherein The adjusting the operating power of the photovoltaic inverter according to the change of the internal temperature of the photovoltaic inverter includes: Obtain the internal temperature of the photovoltaic inverter; When the internal temperature of the photovoltaic inverter exceeds the upper limit value of the working temperature, continuously reduce the operating power of the photovoltaic inverter over time, and record the operating power before the reduction; When the operating power of the photovoltaic inverter has been continuously reduced for the first duration, or when the internal temperature of the photovoltaic inverter drops to the temperature threshold, set the power upper limit value to be less than the operating power recorded before the reduction, and continuously increase the operating power of the photovoltaic inverter over time; Re-obtain the internal temperature of the photovoltaic inverter.

4. The heat dissipation control method according to claim 3, wherein The continuously reducing the operating power of the photovoltaic inverter over time includes: Reduce the operating power of the photovoltaic inverter at a first rate, where the first rate is the power change value per minute; The continuously increasing the operating power of the photovoltaic inverter over time includes: Increase the operating power of the photovoltaic inverter at a second rate, where the second rate is the power change value per minute; Among them, the first rate is greater than the second rate.

5. The heat dissipation control method according to claim 3, wherein The continuously increasing the operating power of the photovoltaic inverter over time includes: When the operating power of the PV inverter increases to the power upper limit value, monitor the internal temperature of the PV inverter within the second time period; When the internal temperature of the PV inverter within the second time period does not exceed the upper limit value of the operating temperature, control the PV inverter to operate at the current operating power.

6. The heat dissipation control method according to claim 1, wherein In the case where the operating mode is the second operating mode, the control of the cooling fan to operate at a speed lower than the maximum speed includes: Start the cooling fan at the first speed and continue for the third time period; When the internal temperature of the PV inverter rises within the third time period, increase the first speed to the second speed and continue for the fourth time period; When the internal temperature of the PV inverter rises within the fourth time period, increase the second speed to the maximum speed.

7. The heat dissipation control method according to claim 1, wherein The adjustment of the speed of the cooling fan according to the change of the internal temperature of the PV inverter includes: When the internal temperature of the PV inverter is stable and does not exceed the upper limit value of the operating temperature, maintain the operating power of the PV inverter and reduce the speed of the cooling fan; When the internal temperature of the PV inverter rises within the fifth time period after reducing the speed of the cooling fan, increase the speed of the cooling fan; When the internal temperature of the PV inverter does not rise within the fifth time period after reducing the speed of the cooling fan, continue to reduce the speed of the cooling fan.

8. The heat dissipation control method according to claim 1, wherein The heat dissipation control method further includes: After the self-check of the cooling fan passes, detect the internal temperature of the PV inverter; When the internal temperature of the PV inverter is greater than the fan start temperature value, control the cooling fan to start according to the currently set operating mode of the PV inverter.

9. A controller, characterized in that, Comprising at least one processor and a memory for communicatively connecting with the at least one processor; The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the heat dissipation control method according to any one of claims 5 to 8.

10. A photovoltaic inverter, characterized in that, Comprising a controller according to claim 10.

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