Substation cable trench solar chimney performance simulation method, heat dissipation and dehumidification system and substation

Abstract

The invention provides a substation cable trench solar chimney performance simulation method, a heat dissipation and dehumidification system and a substation, and the method comprises the steps: firstly obtaining the structural data of the substation, and determining the model information of a solar chimney according to the structural data; secondly, fluid numerical simulation is carried out according to the structural data and the model information, and the influence relation of each target parameter on the cable trench dehumidification effect is determined; verifying whether the influence relationship is accurate or not according to data measured by a transformer substation reduced scale experiment; and finally, when the influence relationship of each target parameter on the dehumidification effect is accurate, taking the influence relationship as a performance simulation result of the solar chimney. A solar chimney matched with the structure of a transformer substation is arranged, then numerical simulation is carried out, the influence relation between moisture flow in the transformer substation and the solar chimney and target parameters is solved after verification and serves as a simulation result, and therefore under which conditions, the solar chimney can be used for dehumidification, operation of a ventilation / dehumidification system is reduced, and the ventilation / dehumidification efficiency is improved. The operation cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of substation dehumidification, and particularly relates to a performance simulation method for a solar chimney in a substation cable trench, a heat dissipation and dehumidification system, and a substation. Background Art

[0002] A cable trench is an underground trench for laying cables. Affected by rainwater intrusion, leakage through gaps, seepage from the wall surface, and untimely drainage and ventilation, the cable trench is severely humid. However, in most of the engineering practices and theoretical studies related to the humidity treatment of cable trenches, attention is mainly paid to the dehumidification measures of electrical equipment itself, and a physical method of sealing is adopted at the connection between the electrical equipment and the cable trench. With the aging of the seal, this method will fail.

[0003] In the prior art, a corresponding ventilation / dehumidification system is usually set in the substation cable trench to ensure that electrical equipment is not affected by moisture, but the operation cost of this ventilation / dehumidification system is relatively high. Summary of the Invention

[0004] In view of this, the invention provides a performance simulation method for a solar chimney in a substation cable trench, a heat dissipation and dehumidification system, and a substation, aiming at solving the problem of relatively high operation cost of the dehumidification measures for substation cable trenches in the prior art.

[0005] The first aspect of the embodiment of the invention provides a performance simulation method for a solar chimney in a substation cable trench, which is characterized by including:

[0006] S1. Obtain the structural data of the substation, and determine the model information of the solar chimney according to the structural data;

[0007] S2. Establish a hydrodynamic model of the solar chimney according to the structural data of the substation and the model information of the solar chimney, perform fluid numerical simulation, and determine the influence relationship of each target parameter on the dehumidification effect of the cable trench;

[0008] S3. Verify whether the influence relationship of each target parameter on the dehumidification effect of the cable trench is accurate according to the data measured by the substation scale experiment;

[0009] S4. When the influence relationship of each target parameter on the dehumidification effect is accurate, use the influence relationship as the performance simulation result of the solar chimney.

[0010] Further, in S2, the hydrodynamic model of the solar chimney includes a radiation model, a motion model, and boundary conditions.

[0011] The radiation model includes a heat transfer part representing the relationship between solar radiation intensity and the radiation energy absorbed by air, and a buoyancy part representing the influence of the temperature difference between the air temperature at the inlet of the solar chimney and the air temperature at the outlet on buoyancy.

[0012] The motion model describes the motion of fluid within a substation, including an energy equation expressing the turbulent kinetic energy generated by the buoyancy force, and a momentum equation describing the relationship between fluid velocity and turbulent kinetic energy at a fixed fluid density.

[0013] The boundary conditions are the position limitation and size limitation of the air vents of the cable trench cover plate.

[0014] Further, the specific steps for determining the influence relationship of each target parameter on the dehumidification effect of the cable trench in S2 are as follows:

[0015] S2.1 Perform fluid numerical simulation based on the structural data of the substation and the model information of the solar chimney to determine the influence relationship of each target parameter on the dehumidification effect, including the following steps:

[0016] S2.2 Adjust the numerical values of each target parameter in the fluid mechanics model of the solar chimney and calculate the dehumidification effect after each adjustment; the dehumidification effect includes dehumidification speed and dehumidification uniformity.

[0017] S2.3 Fit the influence relationship of each target parameter on the dehumidification effect based on the dehumidification effect corresponding to the numerical values of each target parameter, including:

[0018] Fit the first influence relationship based on the dehumidification effect corresponding to the numerical values of each target parameter; in the first influence relationship, solar radiation intensity, air humidity at the air inlet of the solar chimney, indoor heat source intensity, and cable trench cover plate air vent data are the independent variables of this relationship, and dehumidification speed and uniformity are the dependent variables of this relationship.

[0019] Fit the second influence relationship between the cable trench cover plate air vent data and the dehumidification uniformity; in the second influence relationship, the cable trench cover plate air vent data is the independent variable of this relationship, and the dehumidification uniformity is the dependent variable of this relationship.

[0020] Further, in S2, the target parameters include solar radiation intensity, air humidity at the air inlet of the solar chimney, indoor heat source intensity, and cable trench cover plate air vent data.

[0021] Further, S4 also includes the following steps:

[0022] When the influence relationship of a target parameter on the dehumidification effect is inaccurate, adjust the fluid mechanics model of the solar chimney, including the radiation model, motion model, and boundary conditions, using the dehumidification effect data measured by the substation scale experiment; and jump to adjusting the numerical values of each target parameter in the fluid mechanics model of the solar chimney and calculating the dehumidification effect after each adjustment.

[0023] Further, the structural data includes the height of the substation outer wall, indoor structural data, structural data of the cable trench cover air vents, and cable trench structural data. The model information of the solar chimney includes the height of the flat glass of the solar chimney, the air gap width, the outlet opening height, and the inlet opening height. Specifically:

[0024] The height of the flat glass is equal to the height of the substation outer wall; the height of the underground part of the chimney is equal to the depth of the cable trench; the ratio of the air gap width to the height of the flat glass is 1:14; the ratio of the outlet opening height to the air gap width is 0.25; the ratio of the cross-sectional area of the inlet of the solar chimney to the cross-sectional area of the outlet of the solar chimney is between [0.8, 1].

[0025] A second aspect of the embodiments of the present invention provides a substation heat dissipation and dehumidification system, characterized in that the heat dissipation and dehumidification system includes a solar chimney and a controller; the controller is connected to the cable trench cover; the controller stores a dehumidification performance simulation result simulated according to the substation cable trench solar chimney performance simulation method.

[0026] The controller is used to obtain the numerical values of each target parameter at the current moment, and calculate the dehumidification effect and the target dehumidification effect at the current moment according to the numerical values of each target parameter at the current moment.

[0027] Determine the adjustment information of the cable trench cover according to the performance simulation result, the dehumidification effect at the current moment, and the target dehumidification effect.

[0028] Adjust the cable trench cover according to the adjustment information of the cable trench cover.

[0029] Further, the heat dissipation and dehumidification system further includes an auxiliary fan; the auxiliary fan is arranged in the solar chimney, the controller is connected to the auxiliary fan, and the controller is used to determine the adjustment information of the cable trench cover and the control information of the auxiliary fan according to the performance simulation result, the dehumidification effect at the current moment, and the target dehumidification effect.

[0030] A third aspect of the embodiments of the present invention provides a substation, characterized in that the substation is provided with the substation heat dissipation and dehumidification system as described above.

[0031] The performance simulation method and heat dissipation and dehumidification system of the solar chimney in the substation cable trench provided by the present invention first obtain the structural data of the substation, and determine the model information of the solar chimney according to the structural data; secondly, perform fluid numerical simulation according to the structural data of the substation and the model information of the solar chimney to determine the influence relationship of each target parameter on the dehumidification effect of the cable trench; then, verify whether the influence relationship of each target parameter on the dehumidification effect of the cable trench is accurate according to the data measured by the substation scale experiment; finally, when the influence relationship of each target parameter on the dehumidification effect is accurate, use the influence relationship as the performance simulation result of the solar chimney. By setting a solar chimney matching the substation structure, then performing numerical simulation, and verifying and solving the influence relationship between the moisture flow and the target parameters in the substation and the solar chimney as the simulation result, so as to determine in which cases the solar chimney can be used for dehumidification, reduce the operation of the ventilation / dehumidification system, and reduce the operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 is a schematic structural diagram of the substation provided by the embodiment of the present invention;

[0034] Figure 2 is a flowchart of the implementation of the performance simulation method of the solar chimney in the substation cable trench provided by the embodiment of the present invention;

[0035] Figure 3 is a schematic structural diagram of the solar chimney provided by the embodiment of the present invention.

[0036] Description of the reference numerals:

[0037] 1. Cable chamber, 11. Switchgear, 12. Cable trench, 121. Air inlet of the cable trench cover, 13. Solar chimney, 131. Chimney air inlet, 132. Chimney exhaust outlet, 133. Flat glass, 14. Side wall air inlet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] In the following description, specific details such as specific system structures and technologies are proposed for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering.

[0039] Figure 1 Schematic diagram of the structure of the substation provided by the embodiment of the present invention. Figure 1 As shown, the substation includes a switch cabinet 11, a cable trench 12 and a solar chimney 13 arranged in a cable room 1; a side wall air inlet 14 is arranged on one wall of the cable room 1, which is usually the wall on the backlight side of the cable room; a cable trench cover air outlet 121 that can be connected to the cable trench 12 is arranged on the floor of the cable room 1; the solar chimney 13 is arranged on the light-facing side of the cable room, and the bottom end is connected to the cable trench 12. The above-ground part of the solar chimney 13 is composed of a flat glass 13. After the solar radiation passes through the flat glass 13 to heat the air in the solar chimney 13, the air density in the solar chimney 13 becomes smaller, and it rises upward to the solar chimney exhaust port 132 for discharge. The hot and humid air in the cable trench 12 is supplemented into the solar chimney 13, continues to be heated and discharged. In this process, the dry air outside the cable room 1 takes away the heat dissipation generated by the switch cabinet 11 through the side wall air inlet 14, and then is transmitted to the cable trench 12 through the air flow channel formed by the cable trench cover air outlet 121, and then discharged through the solar chimney 13.

[0040] Figure 2 Flow chart of the method for simulating the dehumidification performance of the solar chimney in the cable trench of a substation according to the present invention. Figure 2 As shown, the performance simulation method of the solar chimney in the cable trench of the substation includes:

[0041] S1, obtaining structural data of the substation, and determining model information of the solar chimney according to the structural data of the substation.

[0042] In the embodiment of the present invention, the structural data of the substation includes the height of the outer wall of the substation, indoor structural data, structural data of the air vents of the cable trench cover, cable trench structural data, etc., which are not limited here.

[0043] In some embodiments, the height of the flat glass of the solar chimney is determined according to the height of the outer wall of the substation; the height of the underground part of the solar chimney is determined according to the depth of the cable trench; the air gap width is determined according to the height of the flat glass; the outlet height of the solar chimney is determined according to the air gap width; and the entrance height of the solar chimney is determined according to the outlet height.

[0044] In an embodiment of the present invention, the height of the flat glass is equal to the height of the outer wall of the substation; the height of the underground part of the chimney is equal to the depth of the cable trench; the ratio of the air gap width to the height of the flat glass is 1:14; the ratio of the outlet height to the air gap width is 0.25; the ratio of the cross-sectional area of ​​the inlet of the solar chimney to the cross-sectional area of ​​the outlet of the solar chimney is between [0.8, 1].

[0045] In the embodiments of the present invention, the chimney height H, the air gap width W, and the outlet opening height h2 will affect the ventilation volume of the solar chimney. The research on the performance of the vertical solar chimney with humid air finds that an increase in humidity will reduce buoyancy. The numerical study of the vertical solar chimney with humid air shows that for a solar chimney using humid air, the ratio of the air gap width W to the solar chimney height H (W / H) is 1:14, and the ratio of the outlet opening height h2 to the air gap width (h2 / W) should be limited to 0.25, which can improve the ventilation mass flow rate and avoid backflow at the outlet. The inlet and outlet sizes of the solar chimney will have different degrees of influence on the ventilation performance. When the ratio of the cross-sectional area of the solar chimney outlet to the inlet is between 0.8 and 1.0, the formation of vortices in the internal airflow of the wall-mounted solar chimney can be effectively avoided.

[0046] Figure 3 is a schematic structural diagram of the solar chimney provided by the embodiments of the present invention. As Figure 3 shown, the height of the solar chimney above the ground is the same as the height of the building wall, that is, the chimney height H is 4.0 m, the air gap width W is 0.3 m, the air gap length L is 2.0 m, the lengths of the inlet and outlet of the solar chimney are the same as the air gap length L, which is 2.0 m, the outlet opening height h2 is 0.08 m, and the inlet opening height h1 is 0.1 m.

[0047] S2. According to the structural data of the substation and the model information of the solar chimney, perform fluid numerical simulation to determine the influence relationship of each target parameter on the dehumidification effect of the cable trench.

[0048] First, establish a fluid mechanics model of the solar chimney according to the structural data of the substation and the model information of the solar chimney; among them, the fluid mechanics model of the solar chimney includes a radiation model, a motion model, and boundary conditions; adjust the numerical values of each target parameter in the fluid mechanics model of the solar chimney, and calculate the dehumidification effect after each adjustment; according to the dehumidification effect corresponding to the numerical values of each target parameter, fit to obtain the influence relationship of each target parameter on the dehumidification effect.

[0049] In the embodiments of the present invention, the radiation model includes a heat transfer part and a buoyancy part; the heat transfer part represents the relationship between the solar radiation intensity and the radiation energy absorbed by the air, and specifically can be a DO radiation model, an S2S radiation model, etc. The buoyancy part represents the influence of the temperature difference between the air temperature at the inlet of the solar chimney and the air temperature at the outlet on the magnitude of the buoyancy, and specifically, a k-ε turbulence model can be used; among them, the air temperature at the inlet is determined by the fluid velocity and the indoor heat source intensity; the temperature difference between the air temperature at the inlet and the air temperature at the outlet is determined by the radiation energy absorbed by the air.

[0050] In the embodiments of the present invention, the motion model describes the motion of fluid in a substation, including an energy equation and a momentum equation. Among them, the energy equation can specifically be the Boussinesq model, which specifically expresses the turbulent kinetic energy generated by buoyancy; the momentum equation describes the relationship between the fluid velocity and the turbulent kinetic energy under a fixed fluid density. The fluid density is affected by the air humidity at the air inlet of the solar chimney. The greater the air humidity, the greater the fluid density. Therefore, the fluid density in the momentum equation will be adjusted according to the change in air humidity.

[0051] In the embodiments of the present invention, the boundary conditions are the position limitation and the size limitation of the air vents on the cable trench cover plate.

[0052] In the embodiments of the present invention, input the solar radiation intensity into the heat transfer part of the radiation model to obtain the radiant energy absorbed by the air. Subsequently, input the indoor heat source intensity and the current fluid flow rate, calculate the air temperature at the air inlet, and combine the radiant energy absorbed by the air to calculate the temperature difference between the air inlet and the air outlet. Calculate the buoyancy generated by solar radiation through the buoyancy part of the radiation model. Then input the buoyancy into the energy equation to calculate the generated turbulent kinetic energy. At the same time, calculate the fluid density based on the air humidity at the air inlet. Calculate the fluid flow rate under the turbulent kinetic energy at this fluid density. Multiply the fluid flow rate by the air humidity, which is the dehumidification amount per unit time, and it can be defined as the dehumidification speed. Different fluid flow rates, positions of the air vents on the cable trench cover plate, and sizes of the air vents (i.e., the data of the air vents on the cable trench cover plate) result in different dehumidification uniformities. The specific relationships between the fluid flow rate, the position of the air vents on the cable trench cover plate, the size of the air vents, and the dehumidification uniformity are determined by the scaled experiment of the substation and are not limited herein.

[0053] In some embodiments, the target parameters include the solar radiation intensity, the air humidity at the air inlet of the solar chimney, the indoor heat source intensity, and the data of the air vents on the cable trench cover plate; according to the dehumidification effects corresponding to the values of each target parameter, the influence relationships of each target parameter on the dehumidification effect are obtained by fitting, including: obtaining the first influence relationship by fitting according to the dehumidification effects corresponding to the values of each target parameter; fitting the second influence relationship between the data of the air vents on the cable trench cover plate and the second dehumidification effect.

[0054] In the embodiments of the present invention, in the first influence relationship, the solar radiation intensity, the air humidity at the air inlet of the solar chimney, the indoor heat source intensity, and the data of the air vents on the cable trench cover plate are the independent variables of this relationship, and the dehumidification speed and uniformity are the dependent variables of this relationship.

[0055] In the embodiments of the present invention, in the second influence relationship, the data of the air vents on the cable trench cover plate are the independent variables of this relationship, and the uniformity is the dependent variable of this relationship.

[0056] S3. According to the data measured in the substation scale experiment, verify whether the influence relationship of each target parameter on the dehumidification effect of the cable trench is accurate.

[0057] In the embodiment of the present invention, the data measured in the substation scale experiment is usually relatively accurate, but the amount of data is small and cannot fully simulate the actual performance of the solar chimney under various conditions. Therefore, by means of numerical simulation, the influence relationship is calculated and then verified by the data measured in the substation scale experiment.

[0058] S4. When the influence relationship of each target parameter on the dehumidification effect is accurate, regard the influence relationship as the performance simulation result of the solar chimney.

[0059] In some embodiments, the method further includes: when the influence relationship of each target parameter on the dehumidification effect is inaccurate, adjust the solar chimney hydrodynamic model according to the dehumidification effect data measured in the substation scale experiment, including the adjustment of the radiation model, motion model and boundary conditions; and jump to the step of adjusting the numerical values of each target parameter in the solar chimney hydrodynamic model and calculating the dehumidification effect after each adjustment.

[0060] In the embodiment of the present invention, when the verification result is inaccurate, add the data measured in the substation scale experiment to the solar chimney hydrodynamic model, and re-perform the above numerical simulation process to fit a new influence relationship.

[0061] In some embodiments, the substation heat dissipation and dehumidification system includes a solar chimney and a controller; the controller is connected to the cable trench cover; the performance simulation result simulated according to the substation cable trench solar chimney performance simulation method in any of the above embodiments is stored in the controller.

[0062] Wherein, the controller is used to obtain the numerical values of each target parameter at the current moment, and calculate the dehumidification effect and the target dehumidification effect at the current moment according to the numerical values of each target parameter at the current moment; determine the adjustment information of the cable trench cover according to the performance simulation result, the dehumidification effect at the current moment and the target dehumidification effect; and adjust the cable trench cover according to the adjustment information of the cable trench cover.

[0063] In the embodiment of the present invention, after obtaining the numerical values of the solar radiation intensity, the air humidity at the air inlet of the solar chimney, the indoor heat source intensity and the data of the air vents of the cable trench cover, input them into the first influence relationship, and the current dehumidification speed and uniformity can be obtained. According to the air humidity at the air inlet of the solar chimney, the dehumidification target can be determined, that is, when the air humidity at the air inlet of the solar chimney is large, a larger dehumidification speed and a higher uniformity are required. The specific relationship between the air humidity at the air inlet of the solar chimney and the target dehumidification effect is set manually and is not limited herein.

[0064] In the embodiments of the present invention, the solar radiation intensity, the air humidity at the air inlet of the solar chimney, and the indoor heat source intensity are all non-artificially changed quantities. The only thing that can be changed is the data of the cable trench cover air vents. Therefore, the target value of the dehumidification speed is input into the first influence relationship, and at the same time, the target value of the uniformity is input into the second influence relationship. By solving the two equations, the target values of the opening position and the opening size of the cable trench cover air vents are determined. By comparing with the current values of the opening position and the opening size corresponding to the dehumidification effect at the current moment, the adjustment information of the cable trench cover can be obtained.

[0065] In some embodiments, the heat dissipation and dehumidification system further includes an auxiliary fan; the auxiliary fan is arranged in the solar chimney, and the controller is connected to the auxiliary fan. The controller is used to determine the adjustment information of the cable trench cover and the control information of the auxiliary fan according to the performance simulation result, the dehumidification effect at the current moment, and the target dehumidification effect.

[0066] In the embodiments of the present invention, if under the current solar radiation intensity, the air humidity at the air inlet of the solar chimney, and the indoor heat source intensity, the maximum values of the dehumidification speed and the uniformity obtained by the cover adjustment are still less than the target values of the dehumidification speed and the uniformity, that is, the adjustment of the cover still cannot meet the dehumidification target. At this time, the auxiliary fan can be turned on for dehumidification. The difference between the above target value and the maximum value, divided by the humidity, is the wind speed additionally assisted by the fan. And according to the relationship between the wind speed and the output power of the fan, the output power of the fan is calculated.

[0067] In the embodiments of the present invention. The heat dissipation and dehumidification system further includes a solar panel. The solar panel is arranged on the outer surface of the substation wall inside the solar chimney. The solar radiation passes through the flat glass and air of the solar chimney and irradiates on the solar panel, generating electric energy to supply power to the auxiliary fan, saving costs.

[0068] In some embodiments, the output power of the auxiliary fan can be the power generation power of the solar panel. From this, the wind speed of the auxiliary fan is calculated, multiplied by the humidity, and the dehumidification speed of the fan can be calculated. Subtracting the dehumidification speed of the fan from the target value of the dehumidification speed is the dehumidification speed that the solar chimney needs to bear. Substituting it into the first influence relationship, the adjustment information of the cable trench cover is calculated.

[0069] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0070] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiments can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0071] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0072] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0073] In the embodiments provided by the present invention, it should be understood that the disclosed device / terminal and method can be implemented in other ways. For example, the device / terminal embodiments described above are only illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there can 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. The indirect couplings or communication connections of the device or unit can be in electrical, mechanical or other forms.

[0074] The units described as separate components may or may not be physically separated, and the components shown 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.

[0075] In addition, in each embodiment of the present invention, each functional unit can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0076] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above-mentioned embodiment methods of the present invention, it can also be completed by a computer program instructing relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0077] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of each embodiment of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for simulating the performance of a solar chimney in a cable trench of a substation, characterized in that: include: S1. Obtaining structural data of the substation, and determining model information of the solar chimney based on the structural data; S2. According to the structural data of the substation and the model information of the solar chimney, a solar chimney fluid mechanics model is established, and a fluid numerical simulation is performed to determine the influence of various target parameters on the dehumidification effect of the cable trench; S3. Based on the data measured by the substation scale experiment, verify whether the influence relationship of each target parameter on the dehumidification effect of the cable trench is accurate; S4. When the influence relationship of each target parameter on the dehumidification effect is accurate, the influence relationship is used as the performance simulation result of the solar chimney.

2. The method for simulating the performance of a cable trench solar chimney in a substation according to claim 1, characterized in that: In S2, the solar chimney fluid dynamics model includes a radiation model, a motion model and boundary conditions, The radiation model includes: a heat transfer part representing the relationship between solar radiation intensity and air absorbed radiation energy, and a buoyancy part representing the effect of the temperature difference between the air temperature at the air inlet and the air temperature at the air outlet of the solar chimney on the buoyancy; The motion model describes the motion of the fluid in the substation, including an energy equation expressing the turbulent kinetic energy generated by buoyancy, and a momentum equation describing the relationship between the fluid velocity and the turbulent kinetic energy at a fixed fluid density; The boundary conditions are the position restriction and size restriction of the air vents of the cable trench cover.

3. The method for simulating the performance of a cable trench solar chimney in a substation according to claim 1, characterized in that: The specific steps of determining the influence relationship of each target parameter on the dehumidification effect of the cable trench in S2 are: S2.1 performs fluid numerical simulation based on the structural data of the substation and the model information of the solar chimney to determine the influence of various target parameters on the dehumidification effect, including the following steps: S2.2 adjusting the values ​​of various target parameters in the solar chimney fluid dynamics model, and calculating the dehumidification effect after each adjustment; the dehumidification effect includes dehumidification speed and dehumidification uniformity; S2.3 According to the dehumidification effect corresponding to the value of each target parameter, the influence relationship of each target parameter on the dehumidification effect is fitted, including: According to the dehumidification effect corresponding to the numerical value of each target parameter, the first influence relationship is fitted; in the first influence relationship, the solar radiation intensity, the air humidity at the air inlet of the solar chimney, the indoor heat source intensity, and the cable trench cover vent data are the independent variables of the relationship, and the dehumidification speed and uniformity are the dependent variables of the relationship; The second influencing relationship between the cable trench cover vent data and the dehumidification uniformity is fitted. In the second influencing relationship, the cable trench cover vent data is the independent variable of the relationship, and the dehumidification uniformity is the dependent variable of the relationship.

4. The method for simulating the performance of a cable trench solar chimney in a substation according to claim 1, characterized in that: In S2, the target parameters include solar radiation intensity, air humidity at the air inlet of the solar chimney, indoor heat source intensity and cable trench cover air outlet data.

5. The method for simulating the performance of a cable trench solar chimney in a substation according to claim 3, characterized in that: The S4 also includes the following steps: When the influence relationship between the target parameters and the dehumidification effect is inaccurate, the dehumidification effect data measured by the substation scale experiment is used to adjust the solar chimney fluid dynamics model, including the radiation model, the motion model and the boundary conditions; and jump to adjusting the values ​​of each target parameter in the solar chimney fluid dynamics model, and calculate the dehumidification effect after each adjustment.

6. The method for simulating the performance of a cable trench solar chimney in a substation according to claim 1, characterized in that: The structural data includes the height of the outer wall of the substation, the indoor structural data, the structural data of the cable trench cover vents, and the cable trench structural data. The model information of the solar chimney includes the height of the flat glass of the solar chimney, the air gap width, the outlet opening height, and the inlet opening height. Specifically: The height of the flat glass is equal to the height of the outer wall of the substation; the height of the underground part of the chimney is equal to the depth of the cable trench; the ratio of the air gap width to the height of the flat glass is 1:14; the ratio of the outlet opening height to the air gap width is 0.25; the ratio of the cross-sectional area of ​​the inlet of the solar chimney to the cross-sectional area of ​​the outlet of the solar chimney is between [0.8, 1].

7. A heat dissipation and dehumidification system for a substation, characterized in that: The heat dissipation and dehumidification system comprises a solar chimney and a controller; the controller is connected to the cable trench cover; the controller stores a dehumidification performance simulation result obtained by simulating the performance simulation method of the solar chimney in the cable trench of the substation according to any one of claims 1 to 6 above; The controller is used to obtain the values ​​of each target parameter at the current moment, and calculate the dehumidification effect at the current moment and the target dehumidification effect according to the values ​​of each target parameter at the current moment; Determining adjustment information of the cable trench cover according to the performance simulation result, the dehumidification effect at the current moment and the target dehumidification effect; According to the adjustment information of the cable trench cover, the cable trench cover is adjusted.

8. The heat dissipation and dehumidification system according to claim 7, characterized in that: The heat dissipation and dehumidification system also includes an auxiliary fan; the auxiliary fan is arranged in the solar chimney, and the controller is connected to the auxiliary fan. The controller is used to determine the adjustment information of the cable trench cover and the control information of the auxiliary fan according to the performance simulation results, the dehumidification effect at the current moment and the target dehumidification effect.

9. A substation, characterized in that: The substation is provided with a substation heat dissipation and dehumidification system as described in any one of claims 7-8.

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