Water cooling system for photovoltaic inverter

Abstract

The invention discloses a water cooling system for a photovoltaic inverter, and relates to the technical field of photovoltaic inverters, a supporting assembly is used for supporting a sunshade and a cooling water pipe, the sunshade is located above the inverter, and the projection of the inverter on the horizontal plane is located within the range of the projection of the sunshade on the horizontal plane to form complete shielding. The water spraying head is arranged at the end part of the cooling water pipe, water flows from the cooling water pipe and flows out from the water spraying head, water is sprayed to the upper surface of the sunshade to realize cooling, the surrounding environment of the inverter is cooled, and cooling water falling from the sunshade is collected by the water collecting disc; the sunshade can prevent the inverter from being directly irradiated by sunlight, the temperature of the environment around the inverter is reduced by spraying water to the sunshade, the adverse effect of high temperature in summer on normal operation of the photovoltaic inverter is reduced, and water is shielded by the sunshade and cannot be directly sprayed on the inverter.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic inverters, and in particular to a water cooling system for a photovoltaic inverter. Background Art

[0002] As the global climate warms, extreme weather occurs more frequently, especially extremely high temperatures in the summer, which occur more and more frequently and for longer periods of time, bringing new challenges to the operation of electrical equipment in industrial and commercial distributed photovoltaic projects.

[0003] Almost all the components and inverters of industrial and commercial distributed photovoltaic projects are installed on the roof. The roofs for photovoltaic installation can be divided into two types: color steel tiles and concrete, and color steel tile roofs occupy the vast majority. In the hot summer noon in July and August in the northern hemisphere, the temperature in some areas can reach above 40℃, while the temperature on the color steel tile roof can reach 50 degrees or above. Such high temperature is extremely unfavorable to the stable operation of the photovoltaic inverter on the roof.

[0004] Generally speaking, for a low-voltage grid-connected 110kW photovoltaic inverter, when the irradiation is good and the inverter is over-generated, the power generation of the inverter will be peak-cut when the ambient temperature is 40℃~45℃. When the temperature is 45℃~60℃, as the inverter temperature increases, the inverter will experience a significant derating operation in a linear relationship with the temperature. When the temperature is 60℃, the inverter power will drop by 70%. If it exceeds 60℃, the inverter may not operate normally, affecting the power generation of the photovoltaic system. At the same time, high temperature will also reduce the performance and life of the internal components of the inverter.

[0005] Most of the photovoltaic inverters on the market now adopt natural ventilation and forced air cooling measures to dissipate heat, and a cooling fan is installed inside the inverter. Although such measures are effective in dissipating heat from the inverter, due to the high ambient temperature of the roof, the heat dissipation capacity of air cooling is limited. In actual situations, when the ambient temperature is very high, the inverter also has a significant derating operation.

[0006] For those skilled in the art, how to reduce the adverse effects of high temperatures in summer on the normal operation of photovoltaic inverters is a technical problem that needs to be solved at present. Summary of the invention

[0007] The core of the present invention is to provide a photovoltaic inverter water cooling system, which uses water cooling to cool the surrounding environment of the inverter to reduce the adverse effects of high temperatures in summer on the normal operation of the photovoltaic inverter. The specific scheme is as follows:

[0008] A photovoltaic inverter water cooling system, comprising a sunshade, a cooling water pipe, a sprinkler head, a support assembly, and a water collecting tray;

[0009] The support assembly is used to support the sunshade and the cooling water pipe, so that the sunshade is above the inverter, and the projection of the inverter on the horizontal plane is within the range of the projection of the sunshade on the horizontal plane;

[0010] The water spray head is arranged at the end of the cooling water pipe, and is used for spraying water to the upper surface of the awning to achieve cooling; the water collecting tray is used for collecting water falling from the awning.

[0011] Optionally, the sunshade is an umbrella-shaped structure that is high in the middle and low around the sides; the water spray head is arranged at the highest point of the sunshade;

[0012] The water collecting tray is annular and can collect water falling from around the awning.

[0013] Optionally, the water collecting tray is fixed to the color steel tile roof by a clamp and keeps consistent with the inclination of the color steel tile roof;

[0014] The water collecting tray is connected to the water collecting tank through a water collecting pipe to store the collected water.

[0015] Optionally, the interior of the water collecting box is divided into an upper chamber and a lower chamber, the water collecting pipe is used to transport high-temperature water after absorbing heat to the upper chamber, and the high-temperature water in the upper chamber is cooled and transported to the lower chamber through upper and lower conducting pipes, and upper and lower electromagnetic gate valves for controlling on and off are arranged on the upper and lower conducting pipes;

[0016] The lower chamber is transported to the cooling water pipe through a return pipe;

[0017] A time relay is installed on the water collecting tank.

[0018] Optionally, the return pipe is connected to a water supply network, and is used to directly deliver water from the water supply network to the cooling water pipe;

[0019] And / or, the return pipe is connected to a drain pipe for draining water from the pipe;

[0020] And / or, the upper part of the upper chamber is connected to an overflow pipe, and the lower part of the lower chamber is connected to a vent pipe.

[0021] Optionally, the upper chamber and the lower chamber are respectively provided with water level sensors;

[0022] And / or, the water collecting pipe and the return pipe are respectively provided with vacuum breakers.

[0023] Optionally, a centrifugal pump, a pressure gauge, a first gate valve, a second gate valve, a first electromagnetic gate valve, a first check valve, and a second check valve are arranged on the return pipe;

[0024] The water supply pipe network is provided with a water supply electromagnetic gate valve, a water supply check valve and a water meter;

[0025] A drainage ball valve is arranged on the drain pipe;

[0026] A vent ball valve is arranged on the vent pipe;

[0027] A cooling electromagnetic gate valve is arranged on the cooling water pipe.

[0028] Optionally, the return pipe is used to deliver water to more than two cooling water pipes;

[0029] Alternatively, the return pipe delivers water to the photovoltaic cleaning system through a cleaning water pipe.

[0030] Optionally, a temperature sensor for monitoring temperature is arranged near the inverter, and the controller controls the amount of water sprayed from the water spray head according to the detection value of the temperature sensor.

[0031] Optionally, the support assembly includes a plurality of vertical support rods, transverse support rods, and oblique support rods, the vertical support rods and the transverse support rods are cross-fixed to each other to form a frame, and the oblique support rods are used to provide oblique support for the frame.

[0032] The present invention provides a water-cooling system for a photovoltaic inverter. A supporting component is used for supporting a sunshade and a cooling water pipe. The sunshade is located above the inverter. The projection of the inverter on a horizontal plane is within the range of the projection of the sunshade on the horizontal plane, forming a complete shielding. A water spray head is arranged at the end of the cooling water pipe. Water flows from the cooling water pipe and flows out from the water spray head. Water is sprayed onto the upper surface of the sunshade to achieve cooling and cool down. The surrounding environment of the inverter is cooled and cooled down. The cooling water falling from the sunshade is collected by a water collecting tray. The sunshade can prevent the inverter from being directly exposed to direct sunlight. The ambient temperature around the inverter is reduced by spraying water onto the sunshade, thereby reducing the adverse effect of high temperature in summer on the normal operation of the photovoltaic inverter. The water is blocked by the sunshade and will not directly splash onto the inverter. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a front view of the photovoltaic inverter water cooling system of the present invention;

[0035] Figure 2 It is a side view of the photovoltaic inverter water cooling system of the present invention;

[0036] Figure 3 A top view of a photovoltaic inverter water cooling system according to the present invention;

[0037] Figure 4 It is a schematic diagram of the piping of the photovoltaic inverter water cooling system of the present invention;

[0038] Figure 5 This is a control logic diagram of the photovoltaic inverter water cooling system of the present invention;

[0039] Figure 6 This is a control system diagram of the photovoltaic inverter water cooling system of the present invention.

[0040] The figure includes:

[0041] Inverter 001, color steel tile roof 002;

[0042] Awning 101, cooling water pipe 102, cooling electromagnetic gate valve 1021, sprinkler head 103, support assembly 104, vertical support rod 1041, transverse support rod 1042, oblique support rod 1043, water collecting tray 105, clamp 1051;

[0043] Water collecting pipe 201, water collecting box 202, upper chamber 2021, lower chamber 2022, time relay 2023, upper and lower conducting pipes 2024, upper and lower electromagnetic gate valves 2025, water level sensor 2026, return pipe 203, centrifugal pump 2031, pressure gauge 2032, first gate valve 2033, second gate valve 2034, first electromagnetic gate valve 2035, first check valve 2036, second check valve 2037, water supply network 204, water supply electromagnetic gate valve 2041, water supply check valve 2042, water meter 2043, drain pipe 205, drain ball valve 2051, overflow pipe 206, vent pipe 207, vent ball valve 2071, cleaning water pipe 208, cleaning gate valve 2081;

[0044] Control circuit 301, data acquisition control component 302, intelligent monitoring background component 303. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the technical solution of the present invention, the photovoltaic inverter water cooling system of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0046] Combination Figure 1 , Figure 2 , Figure 3 As shown, the present invention provides a photovoltaic inverter water cooling system, which includes a sunshade 101, a cooling water pipe 102, a sprinkler head 103, a support assembly 104, a water collecting tray 105 and other structures.

[0047] The support assembly 104 plays a supporting role. The sunshade 101 and the cooling water pipe 102 are respectively installed on the support assembly 104. The support assembly 104 positions and fixes the sunshade 101 and the cooling water pipe 102. The bottom of the support assembly 104 remains fixed. Figure 1 , Figure 2 As shown, the bottom of the support assembly 104 is fixed on the color steel tile roof 002.

[0048] The supporting assembly 104 fixes the awning 101 above the inverter 001. There is a certain distance between the awning 101 and the inverter 001. The projection area of ​​the awning 101 on the horizontal plane is larger than the projection area of ​​the inverter 001 on the horizontal plane. The projection of the inverter 001 on the horizontal plane is within the range of the projection of the awning 101 on the horizontal plane. The awning 101 completely blocks the inverter 001 from above.

[0049] The water spray head 103 is arranged at the end of the cooling water pipe 102. The cooling water pipe 102 is used for water supply flow, and the water spray head 103 is used for spraying cooling water. The water sprayed from the water spray head 103 flows to the upper surface of the awning 101, and the upper surface of the awning 101 is evenly soaked with water to achieve cooling; because the awning 101 blocks the inverter 001 below, the heat from the sunlight is more concentrated on the awning 101. When water flows through the upper surface of the awning 101, the flowing water absorbs the heat of the awning 101, achieving a cooling effect, and reducing the ambient temperature around the inverter 001. The present invention uses the cooperation of the awning 101 and running water, and the water does not directly contact the inverter 001, thereby ensuring the power usage case. The running water takes away the heat of the awning 101, so that the surrounding environment where the inverter 001 is located is cooled down. The inverter 001 works at a suitable ambient temperature, thereby avoiding the peak power generation of the inverter 001.

[0050] The water collecting tray 105 has a groove structure, which is vertically opposite to the edge of the awning 101. The water collecting tray 105 is used to collect water falling from the awning 101, guide and converge the falling water, and prevent the water from flowing around and interfering with the inverter 001.

[0051] On the basis of the above scheme, the sunshade 101 of the present invention is an umbrella-shaped one with a high middle and low surroundings. The surface of the umbrella-shaped one can be a conical surface (such as a tetrahedron) or a curved surface. The water spray head 103 is set at the highest point of the sunshade 101. The water sprayed by the water spray head 103 first reaches the highest point in the middle of the sunshade 101, and disperses and flows around under the action of gravity, which can form a uniform dispersion effect on the entire sunshade 101, and the middle water spray head 103 only needs to spray cooling water outward from one point. The water collecting tray 105 is annular, and the middle of the water collecting tray 105 is hollow, which can leave a evacuation space for the support assembly 104. The inner circle diameter of the water collecting tray 105 is smaller than the diameter of the sunshade 101, and the outer circle diameter of the water collecting tray 105 is larger than the diameter of the sunshade 101, which can collect water falling from all around the sunshade 101. In this structure, the cooling water pipe 102 is arranged below the sunshade 101, and the cooling water pipe 102 is also shielded by the sunshade 101. The water flowing in the cooling water pipe 102 flows from bottom to top, and the water spray head 103 sprays water upward through the sunshade 101. The connection between the water spray head 103 and the sunshade 101 needs to be sealed to prevent the water from above from flowing downward from the joint.

[0052] In addition to adopting an umbrella-shaped structure that is high in the middle and low around, the awning 101 can also be set as a structure that is inclined and lowered from one edge to the other, that is, the entire awning 101 is an inclined surface. Such a structure can also achieve the cooling and lowering effect. When the awning 101 adopts an inclined surface structure, it is necessary to set a pipe along the high edge, and the openings are arranged in rows on the pipe so that water flows through each position of the inclined surface. Correspondingly, the water collecting tray 105 adopts a rectangular tray and is placed under the lower edge of the awning 101. In this structure, the cooling water pipe 102 has a horizontally extending portion, and the cooling water pipe 102 does not need to pass through the awning 101.

[0053] It should be noted that the water sprayed from the water spray head 103 can slowly flow to the upper surface of the awning 101, or it can spray high-pressure water to form water mist dispersion above the awning 101. The water mist can cool the surrounding air in a larger range and has a better space cooling effect. Different spraying effects can be achieved through different structural forms of the water spray head 103.

[0054] Combination Figure 1 , Figure 2 As shown, the water collecting tray 105 of the present invention is fixed to the color steel tile roof by a clamp 1051, and the water collecting tray 105 and the color steel tile roof 002 are fixed as a whole; the color steel tile roof 002 has a certain inclination, and the bottom surface of the water collecting tray 105 is consistent with the inclination of the color steel tile roof 002, ensuring that the water collected by the water collecting tray 105 can automatically flow to a lower place under the action of gravity, so that the water in the water collecting tray 105 can be quickly discharged.

[0055] Combination Figure 4 As shown, the water collecting tray 105 is connected to the water collecting tank 202 through the water collecting pipe 201. The water collecting tank 202 stores the water collected by the water collecting tray 105. The position of the water collecting tank 202 is lower than the position of the water collecting tray 105. The water in the water collecting tray 105 can automatically flow to the water collecting tank 202 under the action of gravity, and the water collecting pipe 201 guides the water.

[0056] In a preferred embodiment of the present invention, the interior of the water collecting tank 202 is divided into an upper chamber 2021 and a lower chamber 2022, the upper chamber 2021 is located at the upper part, and the lower chamber 2022 is located at the lower part, and the upper chamber 2021 and the lower chamber 2022 are separated by a partition, and the partition has a heat insulation effect. The upper chamber 2021 and the lower chamber 2022 are two relatively independent cavities, and an upper and lower conducting pipe 2024 is arranged between the upper chamber 2021 and the lower chamber 2022, and an upper and lower electromagnetic gate valve 2025 for controlling the on-off is arranged on the upper and lower conducting pipe 2024, and the on-off of the upper and lower conducting pipe 2024 is controlled by the upper and lower electromagnetic gate valves 2025, and when the upper and lower electromagnetic gate valves 2025 are opened, the water in the upper chamber 2021 can flow into the lower chamber 2022.

[0057] The water collecting tray 105 collects the high-temperature water that absorbs heat, and the water collected by the water collecting tray 105 flows into the water collecting pipe 201. The water collecting pipe 201 is used to transport the high-temperature water after absorbing heat to the upper chamber 2021. The high-temperature water is first stored in the upper chamber 2021 to avoid the cooling water in the lower chamber 2022 from mixing and heating up, which can ensure that the cooling water maintains a low temperature and ensures the cooling effect. Generally, the temperature is high at noon, and cooling is achieved by spraying water. The high-temperature water gathers in the upper chamber 2021 and does not mix with the water in the lower chamber 2022. After cooling at night, it flows into the lower chamber 2022 for use as cooling water.

[0058] A return pipe 203 is provided between the lower chamber 2022 and the cooling water pipe 102. The lower chamber 2022 is transported to the cooling water pipe 102 through the return pipe 203, and the used cooling water is collected and reused, which can reduce water resource waste and improve the utilization rate of cooling water. Figure 4 As shown, the end of the return pipe 203 is connected to the cooling water pipe 102, and the recovered cooling water can be transported to the cooling water pipe 102.

[0059] A time relay 2023 is installed on the water collecting tank 202. The time relay 2023 is used for timing, starting from the time when the system starts the cooling timing, to control the time period of water supply.

[0060] Combination Figure 4As shown, the return pipe 203 is connected to the water supply network 204, and the water supply network 204 is used to directly deliver water to the cooling water pipe 102. The water supplied by the water supply network 204 flows to the awning 101 through the cooling water pipe 102, and can provide cooling water for cooling when the water in the water collection tank 202 is insufficient. For example, in the initial stage of use, there is no water in the entire pipeline system, so water is first delivered from the water supply network 204 to the cooling water pipe 102 through the return pipe 203, and flows to the upper surface of the awning 101 for cooling. When the amount of collected water is sufficient, the collected water in the water collection tank 202 can be used for cooling.

[0061] Combination Figure 4 As shown, the return pipe 203 is connected to a drain pipe 205 for draining the water in the pipe. When the water in the pipeline needs to be drained, it is discharged outward through the drain pipe 205. The drain pipe 205 is connected to the lowest position of the entire pipeline, so that the water automatically flows into the drain pipe 205 under the action of gravity.

[0062] Combination Figure 4 As shown, the upper part of the upper chamber 2021 is connected to the overflow pipe 206. When the water in the upper chamber 2021 reaches a certain height, in order to prevent the upper chamber 2021 from being filled, the water needs to overflow and be discharged. The connection point of the overflow pipe 206 is located at the upper position of the upper chamber 2021. When the water reaches the position of the overflow pipe 206, it is automatically discharged to the outside. The lower part of the lower chamber 2022 is connected to the vent pipe 207. When the lower chamber 2022 needs to be emptied, the water in the lower chamber 2022 is discharged to the outside through the vent pipe 207.

[0063] The upper chamber 2021 and the lower chamber 2022 are respectively provided with water level sensors 2026, which are used to detect the water level heights of the upper chamber 2021 and the lower chamber 2022. Vacuum breakers are respectively provided on the water collecting pipe 201 and the return pipe 203, and the vacuum breakers are located at the high point turning point of the pipeline, which can discharge the air inside the pipeline.

[0064] Combination Figure 4 As shown, the return pipe 203 of the present invention is provided with a centrifugal pump 2031, a pressure gauge 2032, a first gate valve 2033, a second gate valve 2034, a first electromagnetic gate valve 2035, a first check valve 2036, and a second check valve 2037; the water supply network 204 is provided with a water supply electromagnetic gate valve 2041, a water supply check valve 2042, and a water meter 2043; the drain pipe 205 is provided with a drainage ball valve 2051; the vent pipe 207 is provided with a vent ball valve 2071; and the cooling water pipe 102 is provided with a cooling electromagnetic gate valve 1021. When in use, the corresponding valves are opened or closed respectively to realize the corresponding water supply form.

[0065] If there is water in the lower chamber 2022, the first electromagnetic gate valve 2035 is opened first. If there is no water in the lower chamber 2022 of the water collecting tank, the water supply electromagnetic gate valve 2041 is opened first. The first gate valve 2033 and the second gate valve 2034 are normally open valves. The centrifugal pump 2031, the pressure gauge 2032, and the second check valve 2037 are arranged between the first gate valve 2033 and the second gate valve 2034. When the centrifugal pump 2031 is overhauled, the first gate valve 2033 and the second gate valve 2034 are closed to facilitate the overhaul of the centrifugal pump 2031.

[0066] When the cooling electromagnetic gate valve 1021 is opened, water is supplied to the sprinkler head 103, thereby starting the water spray cooling. The water meter 2043 is used to measure the water consumption. The water supply check valve 2042 and the first check valve 2036 are used to prevent the water supply of the water supply network 204 from flowing back. The centrifugal pump 2031 is used to increase the water pressure of the water supply system. This centrifugal pump is equipped with an adjustable head, and the flow head parameters of the pump can be adjusted as needed, so that the water spray cooling system can control the water spray pressure to collect cooling water; the centrifugal pump 2031 is correspondingly equipped with a joint. The pressure gauge 2032 is used to measure the water pressure. The drainage ball valve 2051 is used to drain the water supply system riser. The water supply system riser uses the riser of the original photovoltaic cleaning system.

[0067] When there are multiple inverters 001, each inverter 011 is cooled independently, and the return pipe 203 is used to send water to more than two cooling water pipes 102. The cooling water pipes 102 are connected in parallel to each other, and several inverters can be cooled simultaneously or individually.

[0068] Combination Figure 4 As shown, the return pipe 203 delivers water to the photovoltaic cleaning system through the cleaning water pipe 208. A cleaning gate valve 2081 is provided on the cleaning water pipe 208 to control the on-off of the waterway. When the photovoltaic panel needs to be cleaned, the cleaning gate valve 2081 is opened to guide water to the surface of the photovoltaic panel for flushing. The cleaning gate valve 2081 is used to open the water supply of the roof photovoltaic cleaning system. When the cleaning gate valve 2081 is opened, the cooling electromagnetic gate valve 1021 is closed. When the cooling electromagnetic gate valve 1021 is opened, the cleaning gate valve 2081 is closed.

[0069] In order to achieve more precise control, a temperature sensor for monitoring the temperature can be set near the inverter 001. The controller controls the amount of water sprayed from the sprinkler head 103 according to the detection value of the temperature sensor. When the temperature reaches the set value, the water spraying is started, and when the temperature is lower than the set value, the water spraying can be stopped.

[0070] Combination Figure 1 , Figure 2As shown, the support assembly 104 provided by the present invention includes a plurality of vertical support rods 1041, a transverse support rod 1042, and an oblique support rod 1043. The vertical support rods 1041 and the transverse support rods 1042 are cross-fixed to form a frame. The vertical support rods 1041 are arranged vertically and spaced apart, and the transverse support rods 1042 are arranged transversely and spaced apart. The vertical support rods 1041 and the transverse support rods 1042 can be connected by bolt fixing, welding, etc. to form a horizontal and vertical staggered structure. The oblique support rods 1043 are used to form an oblique support for the frame. The oblique support rods 1043 can be fixed to the vertical support rods 1041 or the transverse support rods 1042 to form a triangular structure to improve the stability of the support. The sunshade 101 and the support assembly 104 are made of stainless steel, and the connection between the sunshade 101 and the support assembly 104 is welded. The cooling water pipe 102 can be fixed to the transverse support rod 1042 by a structure such as a U-shaped card.

[0071] Combination Figure 4 , Figure 5 As shown, the working process of the photovoltaic inverter water cooling system is as follows:

[0072] When the temperature sensor detects that the ambient temperature near the inverter 001 is greater than the set maximum temperature limit T1 (for example: 50°C), the water level sensor 2026 of the lower chamber 2022 detects whether there is water in the lower chamber 2022. If there is no water, the water supply solenoid valve 2041, the cooling solenoid valve 1021, and the start-stop switch of the centrifugal pump 2031 are turned on, and water is supplied by the water supply network 204. When the photovoltaic water cleaning system is not cleaned, the cleaning gate valve 2081 is closed. At this time, the tap water from the water supply network 204 will pass through each node of the DECFGHQJK water pipe path to supply water to the sprinkler head 103 for cooling.

[0073] If the water level sensor 2026 of the lower chamber 2022 detects that there is water in the lower chamber 2022, the first solenoid gate valve 2035, the cooling solenoid gate valve 1021, and the start-stop switch of the centrifugal pump 2031 will be opened. At this time, the water collected in the water collecting tank 202 the day before will supply water to the water spray cooling system through each node of the ABCFGHQJK water pipe path.

[0074] When the water level sensor 2026 of the lower chamber 2022 detects that the water in the lower chamber 2022 is used up, the first solenoid gate valve 2035 will be controlled to close and the water supply solenoid gate valve 2041 will be opened. At this time, the factory tap water will be used to supply water to the water spray cooling system through each node of the DECFGHQJK water pipe path.

[0075] When the cooling system lowers the ambient temperature of the inverter 001 to the set minimum temperature limit T2 (for example: 35°C), if the water is supplied by tap water from the factory, the water supply solenoid gate valve 2041, the cooling solenoid gate valve 1021 and the start / stop switch of the centrifugal pump 2031 will be closed; if the water is supplied by the water collecting tank 202, the first solenoid gate valve 2035, the cooling solenoid gate valve 1021 and the start / stop switch of the centrifugal pump 2031 will be closed, and the water supply to the water spray cooling system will stop. At this time, the system time relay 2023 will detect the system operation time (the time when the water supply electromagnetic gate valve 2041 or the first electromagnetic gate valve 2035 is opened every day is the start time of the system operation). If the system operation time is less than 3 hours, the temperature sensor will continue to monitor the ambient temperature near the inverter 001 to determine whether water is supplied for cooling again; if the system operation time is full 3 hours, the upper and lower electromagnetic gate valves 2025 of the system will be opened, and the water in the upper chamber 2021 of the water collecting tank will be discharged into the lower chamber 2022. At this time, the water level sensor 2026 will monitor whether there is water in the upper chamber 2021 of the water collecting tank. If there is water, the water will continue to be discharged into the lower chamber 2022. If there is no water, it means that the water in the upper chamber 2021 has been discharged into the lower chamber 2022, then the upper and lower electromagnetic gate valves 2025 are closed, and the time relay 2023 is reset to prepare for the inverter water cooling on the next day.

[0076] Generally, the highest roof temperature in summer is from 12 noon to 3 pm, so the detection time of the time relay of the water cooling system is 3 hours. The capacity Q (unit: cubic meter) of the water collecting tank 202 can be calculated based on the time period t (unit: hour) > T1, the flow rate v (unit: meter / hour) of the water supply system, and the cross-sectional area s (unit: square meter) of the pipe. Then the water capacity that the water collecting tank 202 needs to accommodate is Q1=v*s*t, so the water collecting tank capacity Q setting requirement is Q>2 v*s*t.

[0077] When the photovoltaic system has a component cleaning plan the next day, the temperature sensor power supply is turned off in advance through the background, so that the water cooling system will not run. If there is water in the lower chamber 2022 of the water collecting tank, the first solenoid gate valve 2035 and the cleaning gate valve 2081 can be opened manually through the background, and the water reaches the photovoltaic cleaning system water hydrant through each node of the ABCFGHQR path to clean the photovoltaic panel components. If there is no water in the lower chamber 2022 of the water collecting tank, the water supply solenoid gate valve 2041 and the cleaning gate valve 2081 can be opened manually through the background, and the water reaches the photovoltaic cleaning system water hydrant through each node of the DECFGHQR path to clean the components.

[0078] The pipes used for water supply in the system are all made of DN32 PPR (Polypropylene Random) pipes, and the vent pipe 207, overflow pipe 206, and drain pipe 205 are all made of DN50 PPR pipes.

[0079] Combination Figure 6 As shown, the control system of the photovoltaic inverter water cooling system includes a control circuit 301, a data acquisition control component 302, and an intelligent monitoring background component 303. The control circuit 301 integrates the control logic of the system and connects various sensors, relays, electromagnetic water gate valves and circuit switches.

[0080] The temperature sensor mainly controls the opening and closing of the water supply electromagnetic gate valve 2041, the first electromagnetic gate valve 2035, and the cooling electromagnetic gate valve 1021 through the temperature signal; the water level signal detected by the water level sensor 2026 in the lower chamber 2022 of the water collecting tank controls the opening and closing of the water supply electromagnetic gate valve 2041, the first electromagnetic gate valve 2035, and the cooling electromagnetic gate valve 1021; the water level signal detected by the water level sensor 2026 in the upper chamber 2021 of the water collecting tank controls the opening and closing of the upper and lower electromagnetic gate valves 2025; the time relay 2023 takes the time point when the water supply electromagnetic gate valve 2041 or the first electromagnetic gate valve 2035 is opened every day as the start time of the system operation. Detect the system operation time and control the opening and closing of the upper and lower electromagnetic gate valves 2025 according to the operation time. The 402 data acquisition control system can upload the signals and states of each sensor, relay, and electromagnetic gate valve to the monitoring background. At the same time, the parameters of each sensor and relay can be set through the background, and the switch state of the electromagnetic gate valve can be changed at the same time to realize the intelligent control of the entire system.

[0081] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A photovoltaic inverter water cooling system, It is characterized in that It comprises a sunshade (101), a cooling water pipe (102), a sprinkler head (103), a supporting assembly (104), and a water collecting tray (105); The support assembly (104) is used to support the sunshade (101) and the cooling water pipe (102), so that the sunshade (101) is located above the inverter (001), and the projection of the inverter (001) on the horizontal plane is within the range of the projection of the sunshade (101) on the horizontal plane; The water spray head (103) is arranged at the end of the cooling water pipe (102) and is used to spray water onto the upper surface of the awning (101) to achieve cooling; the water collection tray (105) is used to collect water falling from the awning (101).

2. The photovoltaic inverter water cooling system according to claim 1, It is characterized in that The sunshade awning (101) is an umbrella-shaped structure that is high in the middle and low around the sides; the water spray head (103) is arranged at the highest point of the sunshade awning (101); The water collection tray (105) is annular and can collect water that falls from the periphery of the sunshade awning (101).

3. The photovoltaic inverter water cooling system according to claim 2, It is characterized in that The water collecting tray (105) is fixed to the color steel tile roof (002) by means of a clamp (1051) and has the same inclination as the color steel tile roof (002); The water collecting tray (105) is connected to the water collecting tank (202) via a water collecting pipe (201) to store the collected water.

4. The photovoltaic inverter water cooling system according to claim 3, It is characterized in that The interior of the water collecting box (202) is divided into an upper chamber (2021) and a lower chamber (2022); the water collecting pipe (201) is used to transport high-temperature water after absorbing heat to the upper chamber (2021); the high-temperature water in the upper chamber (2021) is cooled and then transported to the lower chamber (2022) through upper and lower conducting pipes (2024); upper and lower electromagnetic gate valves (225) for controlling on and off are provided on the upper and lower conducting pipes (224); The lower chamber (2022) is transported to the cooling water pipe (102) via a return pipe (203); A time relay (2023) is installed on the water collecting tank (202).

5. The photovoltaic inverter water cooling system according to claim 4, It is characterized in that The return pipe (203) is connected to the water supply network (204) and is used to directly supply water from the water supply network (204) to the cooling water pipe (102); And / or, the return pipe (203) is connected to a drain pipe (205) for draining water from the pipe; And / or, the upper portion of the upper chamber (2021) is connected to an overflow pipe (206), and the lower portion of the lower chamber (2022) is connected to a vent pipe (207).

6. The photovoltaic inverter water cooling system according to claim 5, It is characterized in that The upper chamber (2021) and the lower chamber (2022) are respectively provided with water level sensors (2026); And / or, the water collecting pipe (201) and the return pipe (203) are respectively provided with vacuum breakers.

7. The photovoltaic inverter water cooling system according to claim 5, It is characterized in that The return pipe (203) is provided with a centrifugal pump (2031), a pressure gauge (2032), a first gate valve (2033), a second gate valve (2034), a first electromagnetic gate valve (2035), a first check valve (2036), and a second check valve (2037); The water supply pipe network (204) is provided with a water supply electromagnetic gate valve (2041), a water supply check valve (2042), and a water meter (2043); A drainage ball valve (2051) is provided on the drainage pipe (205); The vent pipe (207) is provided with a vent ball valve (2071); The cooling water pipe (102) is provided with a cooling electromagnetic gate valve (1021).

8. The photovoltaic inverter water cooling system according to claim 7, It is characterized in that The return pipe (203) is used to supply water to the two or more cooling water pipes (102); Alternatively, the return pipe (203) delivers water to the photovoltaic cleaning system via a cleaning water pipe (208).

9. The photovoltaic inverter water cooling system according to claim 1, It is characterized in that A temperature sensor for monitoring temperature is arranged near the inverter (001), and a controller controls the amount of water sprayed from the water spray head (103) according to a detection value of the temperature sensor.

10. The photovoltaic inverter water cooling system according to claim 1, It is characterized in that The support assembly (104) comprises a plurality of vertical support rods (1041), transverse support rods (1042), and oblique support rods (1043); the vertical support rods (1041) and the transverse support rods (1042) are cross-fixed to form a frame; and the oblique support rods (1043) are used to form oblique support for the frame.

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