Heat dissipation mechanism, photovoltaic system and control method

Abstract

The present application relates to the field of inverter heat dissipation technology, and particularly relates to a heat dissipation mechanism, a photovoltaic system and a control method, wherein the heat dissipation mechanism is arranged on one side of a to-be-cooled part corresponding to the to-be-cooled part, and the heat dissipation mechanism and the to-be-cooled part are arranged in isolation, and the heat dissipation mechanism at least comprises: a box body having a mounting cavity; an air guide part arranged in the mounting cavity close to an air inlet of the heat dissipation mechanism; a first air inlet and a second air inlet, at least one temperature adjusting member and a temperature detection part. The heat dissipation mechanism has a first heat dissipation state of opening the first air guide channel and closing the second air guide channel, and a second heat dissipation state of closing the first air guide channel and opening the second air guide channel, in the second heat dissipation state, the temperature adjusting member is adapted to cool the heat dissipation medium flowing through the second air guide channel, when the air inlet temperature is too high, the temperature adjusting member can absorb heat of the air medium, and then cool the air medium, so that the temperature of the heat dissipation medium entering the air guide part is reduced, and the temperature of the heat dissipation medium is lower than the ambient temperature.

Description

Technical Field

[0001] This invention relates to the field of inverter heat dissipation technology, specifically to a heat dissipation mechanism, a photovoltaic system, and a control method. Background Technology

[0002] With the new energy revolution, photovoltaics, as a new energy source, is being increasingly built and used. As the most crucial component of photovoltaic power generation, the proper operation of the inverter is paramount. Statistics on major inverter failures reveal that one primary cause is dusty environments, which can lead to cooling fan malfunctions and short-circuit failures in electrical components. In severe cases, this can cause the insulation grid power module to overheat and become damaged, exacerbating the fault and resulting in significant power loss. Therefore, the stability and reliability of the inverter directly affect the overall power generation level of a photovoltaic power station.

[0003] In existing technologies, high-power inverters generally use air cooling for heat dissipation, using air as the heat dissipation medium to cool the high-power inverters in photovoltaic equipment. However, due to the limitations of air convection, the heat dissipation capacity of air cooling will reach a bottleneck, especially at noon when the ambient temperature rises, and the heat dissipation effect of air cooling deteriorates. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, which generally uses air cooling for heat dissipation in high-power inverters, using air as the heat dissipation medium to dissipate heat from the high-power inverters in photovoltaic equipment. Due to the limitations of air convection, the heat dissipation capacity of air cooling will also reach a bottleneck, especially at noon when the ambient temperature rises, the heat dissipation effect of air cooling deteriorates. Therefore, the present invention provides a heat dissipation mechanism, a photovoltaic system and a control method.

[0005] A heat dissipation mechanism is disposed on one side of a component to be cooled, and the two are isolated from each other. The heat dissipation mechanism includes at least: a housing having a mounting cavity; an air inlet disposed in the mounting cavity near the heat dissipation mechanism; a first air inlet and a second air inlet correspondingly opened on the housing and disposed on a first side of the air inlet, wherein a first air inlet and the air inlet form a first air duct, and the second air inlet and the air inlet form a second air duct; at least one temperature regulating component disposed in the mounting cavity and corresponding to the second air inlet, such that the temperature regulating component is located on the path of the second air duct; and a temperature detection component, wherein at least one temperature detection component is disposed at the air inlet of the air inlet and an auxiliary heat dissipation device, wherein the auxiliary heat dissipation device is correspondingly disposed on a second side of the air inlet.

[0006] Optionally, in the above-described heat dissipation mechanism, the heat dissipation mechanism has a first heat dissipation state in which the first air intake channel is opened and the second air intake channel is closed, and a second heat dissipation state in which the first air intake channel is closed and the second air intake channel is opened. In the second heat dissipation state, the temperature regulating component is adapted to cool the heat dissipation medium flowing through the second air intake channel.

[0007] Optionally, in the above heat dissipation mechanism, the first air duct is located on the path of the second air duct and is positioned close to the air duct relative to the temperature regulating component.

[0008] Optionally, the above-mentioned heat dissipation mechanism further includes at least one opening and closing component, which has a first position and a second position relative to the first air inlet and the second air inlet, respectively.

[0009] In the first position, the opening and closing member is adapted to block the first air inlet to close the first air duct and open the second air duct;

[0010] In the second position, the opening and closing member abuts against the inner wall of the housing to close the second air duct and open the first air duct. When the second air duct is closed, the opening and closing member isolates the temperature regulating component from the air duct component.

[0011] Optionally, in the above heat dissipation mechanism, any of the temperature regulating components includes a mounting component and a water-absorbing layer and a phase change material layer disposed on both sides of the mounting component, wherein the water-absorbing layer is disposed on the side closer to the air-exhausting component.

[0012] Optionally, in the above-mentioned heat dissipation mechanism, the water-absorbing layer is one or more of non-woven fabric, cotton pad, and polyethylene pad.

[0013] Optionally, in the above heat dissipation mechanism, the phase change material layer includes a paraffin layer, and a protective layer is wrapped around the outside of the paraffin layer.

[0014] Optionally, in the above-mentioned heat dissipation mechanism, at least one of the temperature regulating components is provided on both sides of the second air inlet.

[0015] Optionally, in the above heat dissipation mechanism, the temperature detection element is a temperature sensor.

[0016] Optionally, in the above-mentioned heat dissipation mechanism, the auxiliary heat dissipation device is an air-cooled radiator.

[0017] A photovoltaic system includes: a heat dissipation mechanism, which is the heat dissipation mechanism described above; and a component to be cooled, which is provided with auxiliary heat dissipation equipment corresponding to the heat dissipation mechanism.

[0018] Optionally, in the above photovoltaic system, the component to be cooled is an inverter.

[0019] A method for regulating the intake air temperature, applied to the photovoltaic system described above, the method comprising:

[0020] Under the first operating condition, obtain the first ambient temperature when the component to be cooled reaches its maximum operating temperature and the first temperature of the auxiliary cooling device;

[0021] Under the second operating condition, obtain the second ambient temperature when the component to be cooled reaches its maximum operating temperature;

[0022] Obtain the inlet air temperature of the air intake of the exhaust fan and the real-time temperature of the auxiliary heat dissipation equipment;

[0023] A control strategy is generated by controlling the heat dissipation mechanism based on the inlet air temperature;

[0024] The intake air temperature is regulated based on the control strategy described above.

[0025] Optionally, in the above control method, the step of controlling the heat dissipation mechanism based on the inlet air temperature to generate a control strategy specifically includes:

[0026] The intake air temperature is compared with either the first ambient temperature or the second ambient temperature:

[0027] When the inlet air temperature is lower than the second ambient temperature, the first induced draft channel is opened and the second induced draft channel is closed, and the induced draft component is shut down.

[0028] When the inlet air temperature is less than or equal to the first ambient temperature, the first air intake channel is opened and the second air intake channel is closed, and the real-time temperature is compared with the first temperature. When the real-time temperature is less than the first temperature, the air intake component operates within a duty cycle of 0-100% according to the real-time temperature. When the real-time temperature is equal to the first temperature, the air intake component rotates to full speed and the first air intake channel is closed, while the second air intake channel is opened.

[0029] When the inlet air temperature is greater than the first ambient temperature, the first exhaust duct is closed, the second exhaust duct is opened, and the real-time temperature is compared with the first temperature. When the real-time temperature is less than the first temperature, the exhaust fan operates within a duty cycle of 0-100% according to the real-time temperature. When the real-time temperature is greater than or equal to the first temperature, the exhaust fan rotates to full speed and the heat sink is unloaded.

[0030] The technical solution of this invention has the following advantages:

[0031] 1. A heat dissipation mechanism provided by the present invention, wherein the heat dissipation mechanism is disposed on one side of the component to be dissipated and the two are isolated therefrom, the heat dissipation mechanism comprising at least: a housing having a mounting cavity; an air inlet disposed in the mounting cavity near the heat dissipation mechanism; a first air inlet and a second air inlet correspondingly opened on the housing and disposed on a first side of the air inlet, wherein a first air inlet and the air inlet form a first air inlet channel, and a second air inlet and the air inlet form a second air inlet channel; at least one temperature regulating component disposed in the mounting cavity and corresponding to the second air inlet, such that the temperature regulating component is located on the path of the second air inlet channel; and a temperature detection component, wherein at least one temperature detection component is respectively disposed at the air inlet of the air inlet and an auxiliary heat dissipation device, wherein the auxiliary heat dissipation device is correspondingly disposed on a second side of the air inlet; the heat dissipation mechanism has a first heat dissipation state in which the first air inlet channel is opened and the second air inlet channel is closed, and a second heat dissipation state in which the first air inlet channel is closed and the second air inlet channel is opened, wherein in the second heat dissipation state, the temperature regulating component is adapted to cool the heat dissipation medium flowing through the second air inlet channel.

[0032] In this structure, the heat dissipation mechanism is placed on one side of the component to be cooled and the two are isolated from each other. The heat dissipation mechanism is used to dissipate heat from the component to be cooled. The heat dissipation mechanism includes a housing, an air intake component, a temperature regulating component, and a temperature detection component. A first air inlet and a second air inlet are provided on the housing on the first side of the air intake component. At the same time, a first air intake channel is formed between the first air inlet and the air intake component, and a second air intake channel is formed between the second air inlet and the air intake component. The temperature regulating component is placed in the mounting cavity and is positioned corresponding to the second air inlet so that the temperature regulating component is located on the path of the second air intake channel. At least one temperature detection component is provided at the air inlet of the air intake component and the auxiliary heat dissipation device, respectively, wherein the auxiliary heat dissipation device is correspondingly positioned on the second side of the air intake component.

[0033] In practical use, the heat dissipation mechanism has a first heat dissipation state where the first air intake channel is open and the second air intake channel is closed, and a second heat dissipation state where the first air intake channel is closed and the second air intake channel is open. In the second heat dissipation state, the temperature regulating component is adapted to cool the heat dissipation medium flowing through the second air intake channel. When the inlet air temperature is too high, the temperature regulating component can absorb heat from the air medium, thereby cooling it down. This reduces the temperature of the heat dissipation medium entering the air intake component, making it lower than the ambient temperature. During the period of worst heat dissipation, it improves the inlet air temperature, increases convective heat transfer, and improves heat dissipation. Enhanced: When the temperature of the heat dissipation medium is low, the first air intake channel can be opened and the second air intake channel can be closed to start the first heat dissipation state. Then, there is no need to use temperature control components to dissipate heat from the heat dissipation medium. Normal air intake can dissipate heat from the heat dissipation component. This overcomes the shortcomings of existing technologies where high-power inverters generally use air cooling for heat dissipation. Air is used as the heat dissipation medium to dissipate heat from the high-power inverters in photovoltaic equipment. Due to the limitations of air convection, the air cooling capacity will also reach a bottleneck, especially at noon when the ambient temperature rises, the heat dissipation effect of air cooling deteriorates. Attached Figure Description

[0034] 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.

[0035] Figure 1 This is a schematic diagram showing the positional structure of the heat dissipation mechanism and the component to be cooled in the first embodiment of the present invention.

[0036] Figure 2 This is a schematic diagram showing the first and second positions of the opening and closing components of the heat dissipation mechanism;

[0037] Figure 3 This is a flowchart of the control method in Example 4;

[0038] Figure 4 This is a schematic diagram showing the relationship between the PWM speed duty cycle of the exhaust fan and the real-time temperature Th detected by the temperature detection device of the auxiliary heat dissipation equipment in Example 4.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Housing; 101. Air outlet; 102. First air inlet; 103. Second air inlet;

[0041] 2. Temperature regulating components; 201. Mounting components; 202. Water-absorbing layer; 203. Phase change material layer;

[0042] 3. Exhaust fan components;

[0043] 4. Components to be cooled; 401. Power components;

[0044] 5. Opening and closing components; 6. First air intake duct; 7. Second air intake duct; 8. Auxiliary heat dissipation equipment;

[0045] 9. Insulation layer; 10. First position; 11. Second position;

[0046] Tin, intake air temperature; Ta0, second ambient temperature; Ta1, first ambient temperature; Th, real-time temperature; Th1, first temperature. Detailed Implementation

[0047] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0048] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] Example 1

[0052] This embodiment describes a heat dissipation mechanism, which is disposed on one side of the heat dissipation component 4 and the two are isolated from each other. The heat dissipation mechanism is used to adjust the inlet air temperature Tin. The heat dissipation mechanism includes at least a housing 1, an air duct 3, a temperature regulating component 2, and a temperature detection component. The housing 1 has an installation cavity. The air inlet of the air duct 3 near the heat dissipation mechanism is disposed in the installation cavity. A first air inlet 102 and a second air inlet 103 are opened on the housing 1. The first air inlet 102 and the second air inlet are both disposed on the first side of the air duct 3.

[0053] A first air intake duct is formed between the first air inlet 102 and the air intake component 3, and a second air intake duct is formed between the second air inlet 103 and the air intake component 3. At least one temperature regulating component 2 is provided in the mounting cavity and corresponding to the second air inlet 103, so that the temperature regulating component 2 is located on the path of the second air intake duct. At least one temperature detection component is provided at the air inlet of the air intake component 3 and the auxiliary heat dissipation device 8, respectively. The temperature detection component is used to detect the inlet air temperature Tin and the real-time temperature Th of the air entering the air intake component and exiting the air intake component 3, respectively. The auxiliary heat dissipation device 8 is correspondingly arranged on the second side of the air intake component 3.

[0054] In actual use, the heat dissipation mechanism has a first heat dissipation state in which the first air intake channel 6 is opened and the second air intake channel 7 is closed, and a second heat dissipation state in which the first air intake channel 6 is closed and the second air intake channel 7 is opened. In the second heat dissipation state, the temperature regulating component 2 is adapted to cool the heat dissipation medium flowing through the second air intake channel.

[0055] When the inlet air temperature Tin of the air entering the air inlet of the air duct 3 is high, the heat dissipation medium can enter the air duct 3 from the second air duct. The temperature regulating component 2 can absorb the heat of the heat dissipation medium, thereby reducing the temperature of the heat dissipation medium. This can prevent the heat dissipation effect of the auxiliary heat dissipation device 8 on the heat dissipation component 4 from being too high. When the inlet air temperature Tin is low, the second air duct 7 is closed and the first air duct 6 is opened. The heat dissipation medium enters the first air duct 6 and then enters the air duct 3, improving the heat dissipation effect of the auxiliary heat dissipation device 8 on the heat dissipation component 4. This ensures that the inlet air temperature Tin of the heat dissipation medium entering the air inlet of the air duct 3 is maintained.

[0056] The heat dissipation mechanism is set on one side of the component 4 to be cooled and isolated from it. The heat dissipation mechanism is used to dissipate heat from the component 4. The heat dissipation mechanism includes a housing 1, an air intake 3, a temperature regulating component 2, and a temperature detection component. A first air inlet 102 and a second air inlet 103 are set on the first side of the air intake 3 on the housing 1. At the same time, a first air intake channel is formed between the first air inlet 102 and the air intake 3, and a second air intake channel is formed between the second air intake 103 and the air intake 3. The temperature regulating component 2 is set in the mounting cavity and is set corresponding to the second air intake 103 so that the temperature regulating component 2 is located on the path of the second air intake channel. At least one temperature detection component is set at the air intake of the air intake 3 and the auxiliary heat dissipation device 8, respectively. The auxiliary heat dissipation device 8 is set on the second side of the air intake 3.

[0057] In practical use, the heat dissipation mechanism has a first heat dissipation state in which the first air intake channel 6 is opened and the second air intake channel 7 is closed, and a second heat dissipation state in which the first air intake channel 6 is closed and the second air intake channel 7 is opened.

[0058] In the second heat dissipation state, the temperature regulating component 2 is used to cool the heat dissipation medium flowing through the second air intake channel. When the inlet air temperature Tin is too high, the temperature regulating component 2 can absorb heat from the air medium and cool it down, thereby reducing the temperature of the heat dissipation medium entering the air intake component 3 to below the ambient temperature. During the worst heat dissipation period, the inlet air temperature Tin is improved, increasing convective heat transfer and enhancing heat dissipation. When the temperature of the heat dissipation medium is low, the first air intake channel 6 can be opened and the second air intake channel 7 can be closed to activate the first heat dissipation state. Then, there is no need to use the temperature regulating component 2 to dissipate heat from the heat dissipation medium. Normal air intake is sufficient to dissipate heat from the heat dissipation component 4, ensuring that the inlet air temperature Tin is below the ambient temperature during the worst temperature period.

[0059] In the heat dissipation mechanism of this embodiment, the first air intake channel can be set on the path of the second air intake channel and positioned close to the air intake component 3 relative to the temperature regulating component 2, so that when the first air intake channel 6 is closed and the second air intake channel 7 is open, the heat dissipation medium can enter the second air intake channel and pass through the temperature regulating component 2 before entering the air inlet of the air intake component 3.

[0060] Of course, the first air intake channel and the second air intake channel can also be arranged side by side on one side of the air intake component 3. This arrangement can also realize the usage of opening the first air intake channel 6 and closing the second air intake channel 7, and closing the first air intake channel 6 and opening the second air intake channel 7.

[0061] In order to open and close the first air intake channel 6 and the second air intake channel 7 during use, the above-mentioned heat dissipation mechanism also includes at least one opening and closing member 5, which has a first position 10 and a second position 11 relative to the first air inlet 102 and the second air inlet 103, respectively.

[0062] In the first position, the opening and closing member 5 is adapted to block the first air inlet 102 to close the first air duct 6 and open the second air duct 7; in the second position, the opening and closing member 5 abuts against the inner wall surface of the housing 1 to close the second air duct 7 and open the first air duct 6. When the second air duct 7 is closed, the opening and closing member 5 isolates the temperature regulating member 2 from the air duct member 3.

[0063] In more detail, the opening and closing member 5 can swing, thereby switching between a first position and a second position. The driving force for the swing of the opening and closing member 5 can be driven by a swing drive motor. Of course, other devices can also be used for swing drive. For example, the opening and closing member 5 is connected to a rotating motor through a rotating shaft. The rotating motor can rotate in both directions, thereby realizing the rotation of the opening and closing member 5.

[0064] When the first air intake channel 6 is located on the path of the second air intake channel 7, the swing angle of the opening and closing member 5 is 90 degrees each time. When the first air intake channel 6 and the second air intake channel 7 are arranged side by side on one side of the air intake member 3, the swing angle of the opening and closing member 5 is 180 degrees each time.

[0065] The temperature regulating component 2 in this embodiment includes a mounting component 201 and a water-absorbing layer 202 and a phase change material layer 203 disposed on both sides of the mounting component 201. The water-absorbing layer 202 is disposed on the side closer to the air duct 3. In actual use, the water-absorbing layer 202 is made of one or more of non-woven fabric, cotton pad, and polyethylene pad. The phase change material layer 203 includes a paraffin layer, and a protective layer can be wrapped around the outside of the paraffin layer.

[0066] Of course, in other embodiments, the phase change material layer 203 can also be other phase change materials, such as n-hexadecane, n-octadecane, and other materials.

[0067] The water-absorbing layer 202 absorbs moisture from the air when the temperature is low and the humidity is high at night, and evaporates and absorbs heat when the temperature is higher during the day. The evaporation process keeps the temperature of the phase change layer low. Therefore, the inlet air temperature Tin can be reduced during the high-temperature period of the day through the water-absorbing layer and the phase change material layer 203.

[0068] In this embodiment, in order to better cool the heat dissipation medium entering the second air intake channel 7 from the second air inlet 103, at least one temperature regulating component 2 is provided on both sides of the second air inlet 103.

[0069] In this embodiment, see Figure 1 The number of temperature regulating components 2 is set to five, and one temperature regulating component 2 is set on each side of the second air inlet 103. This ensures that the heat dissipation medium entering the second air duct 7 can pass through the phase change material layer 203 of the temperature regulating component 2 to achieve the effect of cooling the heat dissipation medium. In actual use, a heat insulation layer 9 can also be set on the outer wall of the box 1 corresponding to the temperature regulating component 2. The heat insulation layer 9 is made of heat insulation material.

[0070] In this embodiment, the temperature detection component is set as a temperature sensor, and the air duct 3 is set as a fan.

[0071] The heat dissipation medium entering the air-exhausting component 3 from the first air-exhausting channel 6 or the second air-exhausting channel 7 can pass through the auxiliary heat dissipation equipment 8 and be output from the air outlet 101 on the housing 1 to form an airflow.

[0072] In this embodiment, the auxiliary heat dissipation device 8 is provided corresponding to the heat dissipation component 4, and the auxiliary heat dissipation device 8 is provided on the second side of the air duct 3 of the heat dissipation mechanism.

[0073] The overall heat dissipation effect of this heat dissipation mechanism is good. The temperature regulating component 2 is used to cool the heat dissipation medium, ensuring that the temperature of the heat dissipation medium entering the air inlet of the air duct 3 is lower than the ambient temperature. In this way, it can work with the auxiliary heat dissipation equipment 8 to dissipate heat from the heat dissipation component 4, resulting in a good overall heat dissipation effect.

[0074] In actual use, the above-mentioned auxiliary heat dissipation device 8 is an air-cooled radiator, which can dissipate heat from the heat-dissipating component 4.

[0075] Example 2:

[0076] This embodiment describes a photovoltaic system, which includes a heat dissipation mechanism and a heat dissipation component 4. The heat dissipation mechanism is the same as that described in Embodiment 1, and the heat dissipation component 4 is provided with an auxiliary heat dissipation device 8 corresponding to the heat dissipation mechanism.

[0077] In this embodiment, the heat dissipation component 4 is also disposed in the housing 1 and is isolated from the auxiliary heat dissipation device 8. The auxiliary heat dissipation device 8, i.e., the air-cooled heat sink, is used to dissipate heat from the heat dissipation component 4. The heat dissipation component 4 can be an inverter. When it is an inverter, the housing 1 in the heat dissipation mechanism and the housing 1 of the heat dissipation component 4 can be the same housing 1. At this time, a partition can be set in the housing 1 to divide the housing 1 into two isolated mounting cavities. The temperature regulating component 2, the air duct 3 and the auxiliary heat dissipation device 8 are correspondingly set in the mounting cavities of the heat dissipation mechanism.

[0078] Example 3:

[0079] This embodiment describes a method for controlling the intake air temperature. This method is applied to the photovoltaic system described in Embodiment 3 to control the intake air temperature Tin of the photovoltaic system. (See also...) Figure 3 The control method includes:

[0080] S101: Under the first operating condition, obtain the first ambient temperature Ta1 when the heat dissipation component 4 reaches the highest operating temperature and the first temperature Th1 of the auxiliary heat dissipation device 8;

[0081] And under the second operating condition, the second ambient temperature Ta0 when the heat dissipation component 4 reaches its maximum operating temperature is obtained;

[0082] S102: Obtain the air inlet temperature Tin of the air inlet of the air duct 3 and the real-time temperature Th of the auxiliary heat dissipation device 8;

[0083] S103: Control the heat dissipation mechanism based on the inlet air temperature Tin, and generate a control strategy;

[0084] S104: Adjust the inlet air temperature Tin based on the control strategy.

[0085] Specifically, the first working condition mentioned above refers to the situation where the temperature regulating component 2 of the heat dissipation mechanism is not involved, and the heat dissipation component 4, i.e. the inverter, is running at full load and the fan is running at full speed. At this time, the first ambient temperature Ta1 when the power element 401 of the heat dissipation component 4 reaches the limit safety temperature is obtained and set as Ta1. At the same time, the corresponding first temperature Th1 of the temperature detection component of the auxiliary heat dissipation device 8 is obtained.

[0086] The second operating condition mentioned above refers to the situation where the temperature regulating component 2, which also does not involve the heat dissipation mechanism, is not involved. When the test fan stops, the heat dissipation component 4, i.e. the inverter, is running at full load. At this time, the second ambient temperature Ta0 when the power element 401 of the heat dissipation component 4 reaches the limit safe temperature is obtained and set as Ta0.

[0087] Then, the intake air temperature Tin and the real-time temperature Th of the auxiliary heat dissipation device 8 are detected, and the heat dissipation mechanism is controlled according to the intake air temperature Tin.

[0088] To elaborate, the heat dissipation mechanism is controlled based on the inlet air temperature (Tin), generating a control strategy, which specifically includes:

[0089] Compare the inlet air temperature Tin with either the first ambient temperature Ta1 or the second ambient temperature Ta0:

[0090] When the inlet air temperature Tin is less than the second ambient temperature Ta0, the first induced draft channel 6 is opened and the second induced draft channel 7 is closed, and the induced draft component 3 is stopped. At this time, the opening and closing component 5 is adjusted to the second position.

[0091] When the inlet air temperature Tin is less than or equal to the first ambient temperature Ta1, the first induced draft channel 6 is opened and the second induced draft channel 7 is closed. The real-time temperature Th is compared with the first temperature Th1. When the real-time temperature Th is less than the first temperature Th1, the PWM speed duty cycle of the induced draft component 3 is set to 0-100%. At this time, the opening and closing component 5 is adjusted to the second position 11. When the real-time temperature Th is equal to the first temperature Th1, the induced draft component 3 rotates at full speed and the first induced draft channel 6 is closed, while the second induced draft channel 7 is opened. At this time, the opening and closing component 5 is adjusted to the first position.

[0092] When the inlet air temperature Tin is greater than the first ambient temperature Ta1, the first exhaust channel 6 is closed, the second exhaust channel 7 is opened, and the real-time temperature Th is compared with the first temperature Th1. When the real-time temperature Th is less than the first temperature Th1, the PWM speed duty cycle of the exhaust component 3 is set to 0-100%, and the opening and closing component 5 is adjusted to the first position. When the real-time temperature Th is greater than or equal to the first temperature Th1, the exhaust component 3 rotates at full speed and the heat sink 4 is unloaded, and the opening and closing component 5 is adjusted to the first position.

[0093] The relationship between the pulsator, i.e. the PWM speed duty cycle of the fan, and the real-time temperature Th detected by the temperature sensor of the auxiliary heat dissipation device is shown in the figure. When the real-time temperature Th of the auxiliary heat dissipation device 8, i.e. the air-cooled radiator, is Ta0, the fan speed is set to 0.

[0094] This control method can effectively control the working state of the heat dissipation mechanism, ensuring that the entire photovoltaic system is in a stable working and heat dissipation state.

[0095] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A heat dissipation mechanism, characterized in that, The heat dissipation mechanism is disposed on one side of the heat dissipation component (4) corresponding to the heat dissipation component (4), and the two are isolated from each other. The heat dissipation mechanism includes at least: The housing (1) has an installation cavity; The air inlet of the air-guiding component (3) is located in the mounting cavity near the heat dissipation mechanism; The first air inlet (102) and the second air inlet (103) are respectively opened on the box (1) and are located on the first side of the air duct (3). The first air inlet (102) and the air duct (3) form a first air duct (6), and the second air inlet (103) and the air duct (3) form a second air duct (7). At least one temperature regulating component (2) is disposed in the mounting cavity and corresponding to the second air inlet (103) so that the temperature regulating component (2) is located on the path of the second air duct (7); Temperature detection device: At least one temperature detection device is provided at the air inlet of the air duct (3) and the auxiliary heat dissipation device (8), wherein the auxiliary heat dissipation device (8) is correspondingly provided on the second side of the air duct (3); The heat dissipation mechanism has a first heat dissipation state in which the first air duct (6) is opened and the second air duct (7) is closed, and a second heat dissipation state in which the first air duct (6) is closed and the second air duct (7) is opened. In the second heat dissipation state, the temperature regulating component (2) is adapted to cool the heat dissipation medium flowing through the second air duct (7). The first air duct (6) is located on the path of the second air duct (7) and is positioned close to the air duct (3) relative to the temperature regulating component (2); It also includes at least one opening and closing element (5), which has a first position and a second position relative to the first air inlet (102) and the second air inlet (103), respectively; In the first position, the opening and closing member (5) is adapted to block the first air inlet (102) to close the first air duct (6) and open the second air duct (7). In the second position, the opening and closing member (5) abuts against the inner wall of the housing (1) to close the second air duct (7) and open the first air duct (6). When the second air duct (7) is closed, the opening and closing member (5) isolates the temperature regulating member (2) from the air duct member (3).

2. The heat dissipation mechanism according to claim 1, characterized in that, Each of the temperature regulating components (2) includes a mounting component (201) and a water-absorbing layer (202) and a phase change material layer (203) disposed on both sides of the mounting component (201).

3. The heat dissipation mechanism according to claim 1, characterized in that, At least one of the temperature regulating components (2) is provided on both sides of the second air inlet (103).

4. The heat dissipation mechanism according to claim 1, characterized in that, The temperature detection element is a temperature sensor.

5. The heat dissipation mechanism according to claim 1, characterized in that, The auxiliary heat dissipation device is an air-cooled radiator.

6. A photovoltaic system, characterized in that, include: A heat dissipation mechanism, wherein the heat dissipation mechanism is the heat dissipation mechanism as described in any one of claims 1-5; The heat dissipation component (4) is provided with an auxiliary heat dissipation device (8) corresponding to the heat dissipation mechanism.

7. The photovoltaic system according to claim 6, characterized in that, The heat-dissipating component (4) is an inverter.

8. A method for controlling the intake air temperature, characterized in that, The method is applied to the photovoltaic system as described in claim 7, wherein the control method includes: Under the first operating condition, the first ambient temperature when the heat dissipation component (4) reaches its maximum operating temperature and the first temperature of the auxiliary heat dissipation device (8) are obtained; Under the second operating condition, the second ambient temperature when the heat dissipation component (4) reaches its maximum operating temperature is obtained; Obtain the inlet air temperature of the air inlet of the air duct (3) and the real-time temperature of the auxiliary heat dissipation device (8); A control strategy is generated by controlling the heat dissipation mechanism based on the inlet air temperature; The intake air temperature is regulated based on the control strategy described above.

9. The control method according to claim 8, characterized in that, The control strategy based on the intake air temperature to control the heat dissipation mechanism specifically includes: The intake air temperature is compared with either the first ambient temperature or the second ambient temperature: When the inlet air temperature is lower than the second ambient temperature, the first air duct (6) is opened and the second air duct (7) is closed, and the air duct (3) is shut down; When the inlet air temperature is less than or equal to the first ambient temperature, the first induced draft channel (6) is opened and the second induced draft channel (7) is closed, and the real-time temperature is compared with the first temperature. When the real-time temperature is less than the first temperature, the induced draft component (3) operates within a duty cycle of 0-100% according to the real-time temperature. When the real-time temperature is equal to the first temperature, the induced draft component (3) rotates at full speed and the first induced draft channel (6) is closed, and the second induced draft channel (7) is opened. When the inlet air temperature is greater than the first ambient temperature, the first air intake channel (6) is closed, the second air intake channel (7) is opened, and the real-time temperature is compared with the first temperature. When the real-time temperature is less than the first temperature, the air intake component (3) operates within a duty cycle of 0-100% according to the real-time temperature. When the real-time temperature is greater than or equal to the first temperature, the air intake component (3) rotates at full speed and the heat dissipation component (4) is unloaded.

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