A method and system for thermal management control of cable trench tunnels in substations

Abstract

This invention relates to the field of thermal management technology for power equipment, and discloses a method and system for thermal management control of cable trench tunnels in substations. First, the dimensional data of the cable trench tunnel is acquired, and the distribution location and quantity of the power exhaust ducts are determined by combining this with the heat dissipation performance data of the exhaust ducts. These exhaust ducts are then laid to construct the substation's heat dissipation system. Next, a two-dimensional cable trench grid model is constructed to determine the coordinates of each power exhaust duct. Based on the substation's operating mode, the corresponding exhaust duct start-up threshold is dynamically set. Finally, based on the comparison between the real-time monitored target cable temperature and the corresponding exhaust duct start-up threshold, the start-up and shutdown states of the power exhaust ducts are intelligently switched. This invention achieves precise, controllable, and continuously efficient heat dissipation in cable trench tunnels by dynamically setting the start-up and shutdown thresholds of the power exhaust ducts and combining this with the comparison of the real-time monitored target cable temperature.

Description

Technical Field

[0001] This invention relates to the field of thermal management technology for power equipment, and in particular to a thermal management control method and system for cable trench tunnels in substations. Background Technology

[0002] The heat dissipation of outdoor cable trenches and tunnels in substations is of paramount importance. In older outdoor substations, cables are intertwined and complexly distributed, making them highly susceptible to overheating. Especially at the intersections of cable trenches and tunnels, cable temperatures can reach as high as 95°C in summer, posing a significant threat to the safe and stable operation of the power system. Existing substations primarily use non-powered ventilation ducts to cool the cables. These ducts rely on natural wind to rotate, and mechanical connections promote airflow within the cable trenches for convection cooling. However, due to the randomness and weakness of natural wind, these ducts are unreliable in cooling the cables, frequently resulting in prolonged periods of inactivity. Therefore, a thermal management and control solution capable of continuously and effectively dissipating heat from cable trenches and tunnels is urgently needed. Summary of the Invention

[0003] This invention provides a thermal management control method and system for cable trench tunnels in substations, which solves the technical problem that existing unpowered ventilation ducts rely entirely on natural wind for operation. Natural wind is characterized by high randomness and weak wind force, resulting in uncontrollable start-up and shutdown of the ventilation ducts and inconsistent heat dissipation, which cannot meet the reliable heat dissipation requirements of cable trench tunnels.

[0004] The first aspect of this invention provides a thermal management control method for cable trench tunnels in substations, comprising:

[0005] Obtain cable trench dimension data and power exhaust duct heat dissipation performance data for cable trench tunnels within the substation.

[0006] Based on the cable trench dimension data and the heat dissipation performance data, determine the exhaust duct distribution data;

[0007] A cable trench mesh model is constructed, and the position coordinates of each power exhaust duct are determined based on the exhaust duct distribution data;

[0008] The start-up threshold of the exhaust duct is determined based on the target operating mode of the substation and the heat dissipation performance data.

[0009] Based on the comparison between the target cable temperature at each of the specified location coordinates and the start-up threshold of the exhaust duct, the start-up and stop status of each of the power exhaust ducts is adjusted.

[0010] Optionally, the cable trench dimensional data includes the transverse length and longitudinal length of the cable trench, and the heat dissipation performance data includes the cooling radius. Determining the exhaust duct distribution data based on the cable trench dimensional data and the heat dissipation performance data includes:

[0011] The horizontal length of the cable trench is calculated by ratioing the cooling radius, and the result is rounded up to obtain the horizontal quantity of the exhaust duct.

[0012] The longitudinal length of the cable trench is calculated by ratioing the cooling radius, and the result is rounded up to obtain the longitudinal number of exhaust ducts.

[0013] Power exhaust ducts are laid with the cooling radius as the spacing, according to the number of horizontal and vertical exhaust ducts;

[0014] Based on the laying results, the distribution data of each power exhaust duct is generated.

[0015] Optionally, the step of constructing a cable trench mesh model and determining the position coordinates of each power exhaust duct based on the exhaust duct distribution data includes:

[0016] Based on the pre-obtained two-dimensional plan view of the substation, construct a two-dimensional plan model of the cable trench tunnel;

[0017] Using the reference point at the entrance of the cable trench tunnel as the origin of the coordinate system, the two-dimensional planar model is divided into grids according to the preset grid unit size to obtain the cable trench grid model.

[0018] Based on the two-dimensional plan view of the substation, the distribution data of the ventilation duct is mapped to the cable trench grid model to obtain the corresponding grid coordinates as location coordinates.

[0019] Optionally, the target operating mode includes a first operating mode and a second operating mode, the exhaust duct start-up threshold includes a first start-up threshold and a second start-up threshold, and determining the exhaust duct start-up threshold based on the substation's target operating mode and the heat dissipation performance data includes:

[0020] When the target operating mode of the substation is the first operating mode, obtain the climate characteristic data of the area where the substation is located;

[0021] The climate characteristic data is used to retrieve the preset start-up switching coefficient key value table and match the corresponding first switching coefficient;

[0022] Based on the aforementioned heat dissipation performance data, determine the baseline value for heat load efficiency;

[0023] The first start-up threshold is determined based on the heat load efficiency benchmark value and the first switching coefficient;

[0024] When the target operating mode of the substation is the second operating mode, obtain the second switching coefficient associated with the second operating mode;

[0025] The second start-up threshold is obtained by multiplying the heat load efficiency benchmark value with the second switching coefficient.

[0026] Optionally, the heat dissipation performance data further includes heat dissipation performance parameters, structural parameters, and airflow performance parameters. The airflow performance parameters include the fan's airflow and outlet radius. Determining the thermal load efficiency benchmark value based on the heat dissipation performance data includes:

[0027] The heat dissipation of the exhaust duct is determined based on the heat dissipation performance parameters and the structural parameters.

[0028] Based on the aforementioned structural parameters, determine the heat dissipation surface area of ​​the exhaust fan;

[0029] The effective ventilation area is obtained by multiplying the square of the air outlet radius by a preset value of pi.

[0030] The average wind speed at the exhaust duct outlet is obtained by calculating the ratio of the fan's air volume to the effective ventilation area.

[0031] The heat load efficiency benchmark value is determined based on the heat dissipation of the exhaust duct, the heat dissipation surface area of ​​the exhaust duct fan, the average wind speed at the exhaust duct outlet, the structural parameters, and the airflow performance parameters.

[0032] Optionally, the first switching coefficient includes a warm season switching coefficient and a cold season switching coefficient, and the first activation threshold includes a warm season activation threshold and a cold season activation threshold. Determining the first activation threshold based on the heat load efficiency benchmark value and the first switching coefficient includes:

[0033] When the first switching coefficient is the warm season switching coefficient, the warm season switching coefficient is multiplied by the heat load efficiency benchmark value to obtain the warm season start-up threshold.

[0034] When the first switching coefficient is the same as the cold season switching coefficient, the cold season switching coefficient is multiplied by the heat load efficiency benchmark value to obtain the cold season start threshold.

[0035] Optionally, the heat dissipation performance parameters include the heat dissipation coefficient and the temperature difference between the inside and outside of the exhaust duct, and the structural parameters include the radius of the exhaust duct. Determining the heat dissipation of the exhaust duct based on the heat dissipation performance parameters and the structural parameters includes:

[0036] The vertical projected area of ​​the exhaust duct is obtained by multiplying the square of the radius of the exhaust duct with the preset value of pi.

[0037] The first multiplication value is obtained by multiplying the vertical projected area of ​​the exhaust duct with the heat dissipation coefficient.

[0038] The heat dissipation of the exhaust duct is calculated by multiplying the first multiplier with the temperature difference between the inside and outside of the exhaust duct.

[0039] Optionally, the structural parameters further include the number of blades, blade length, blade width, and blade thickness. Determining the heat dissipation surface area of ​​the exhaust fan based on the structural parameters includes:

[0040] The second multiplication value is obtained by multiplying the blade length and the blade thickness.

[0041] The third multiplication value is obtained by multiplying the blade length and the blade width.

[0042] The first sum is obtained by performing a summation operation using the second multiplier and the third multiplier;

[0043] The fourth multiplication value is obtained by multiplying the first sum with a preset first coefficient.

[0044] The exhaust fan heat dissipation surface area is obtained by multiplying the fourth multiplier with the number of blades.

[0045] Optionally, the structural parameters further include blade diameter, and the airflow performance parameters further include air convection regulation coefficient. Determining the thermal load efficiency benchmark value based on the exhaust duct heat dissipation, the exhaust duct fan heat dissipation surface area, the average wind speed at the exhaust duct outlet, the structural parameters, and the airflow performance parameters includes:

[0046] The fifth multiplication value is obtained by multiplying the blade diameter with the average wind speed at the exhaust duct outlet.

[0047] The sixth multiplication value is obtained by multiplying the fifth multiplication value with the preset value of pi.

[0048] The sixth multiplier is calculated and exponentially applied to the air convection regulation coefficient to obtain the first exponent;

[0049] The first index is multiplied by the heat dissipation surface area of ​​the exhaust fan to obtain the seventh multiplier.

[0050] The heat load efficiency benchmark value is obtained by calculating the ratio between the heat dissipation of the exhaust duct and the seventh multiplier.

[0051] Optionally, the target cable temperature includes a first cable temperature and a second cable temperature. The step of adjusting the start / stop state of each powered exhaust duct based on the comparison result between the target cable temperature at each of the said position coordinates and the exhaust duct start-up threshold includes:

[0052] When the target cable temperature at the location coordinates is the first cable temperature, the first cable temperature is compared with the warm season start-up threshold, and the first cable temperature is compared with the cold season start-up threshold.

[0053] When the temperature of the first cable is greater than the warm season start-up threshold, the power exhaust duct associated with the location coordinates is switched to start-up mode.

[0054] When the temperature of the first cable is less than the cold season start-up threshold, the power exhaust duct associated with the location coordinates is switched to shutdown mode.

[0055] When the target cable temperature at the location coordinates is the second cable temperature, the second switching coefficient is used to retrieve the preset state coefficient key value table, and the exhaust duct operating range is determined in combination with the second start threshold.

[0056] Based on the operating range of the exhaust duct where the temperature of the second cable is located, the power exhaust duct is switched to start-up mode or stop mode according to the associated switching strategy.

[0057] Optionally, the step of using the second switching coefficient to retrieve a preset state coefficient key-value table and combining it with the second start-up threshold to determine the exhaust duct operating range includes:

[0058] The second switching coefficient is used to retrieve the preset state coefficient key value table and match the corresponding state coefficient;

[0059] The state coefficients include a first state coefficient, a second state coefficient, a third state coefficient, and a fourth state coefficient, all of which are positive real numbers, and satisfy a monotonically increasing relationship;

[0060] The first endpoint value is obtained by multiplying the first state coefficient with the second start threshold.

[0061] The second endpoint value is obtained by multiplying the second state coefficient with the second start threshold.

[0062] The third endpoint value is obtained by multiplying the third state coefficient with the second start threshold.

[0063] The fourth endpoint value is obtained by multiplying the fourth state coefficient with the second start threshold.

[0064] The operating range of the exhaust duct is determined by using the preset lower limit value, the first endpoint value, the second endpoint value, the third endpoint value, the fourth endpoint value, and the preset upper limit value.

[0065] Optionally, the exhaust duct operating condition range includes a first operating condition range, a second operating condition range, a third operating condition range, a fourth operating condition range, and a fifth operating condition range. Determining the exhaust duct operating condition range using the preset lower limit value, the first endpoint value, the second endpoint value, the third endpoint value, the fourth endpoint value, and the preset upper limit value includes:

[0066] The preset lower limit value of the endpoint and the first endpoint value are used as the two endpoint values ​​of the first working condition interval;

[0067] The first endpoint value and the second endpoint value are used as the two endpoint values ​​of the second working condition interval;

[0068] The second endpoint value and the third endpoint value are used as the two endpoint values ​​of the third working condition interval;

[0069] The three endpoint values ​​and the fourth endpoint value are used as the two endpoint values ​​of the fourth working condition interval;

[0070] The four endpoint values ​​and the preset endpoint upper limit value are used as the two endpoint values ​​of the fifth working condition interval.

[0071] Optionally, the step of switching the powered exhaust duct to start-up mode or stop-down mode according to the associated switching strategy based on the operating condition range of the exhaust duct where the second cable temperature is located includes:

[0072] When the temperature of the second cable is within the first operating range, the power exhaust duct associated with the temperature of the second cable is switched to shutdown mode.

[0073] When the temperature of the second cable is within the second operating condition range, the power exhaust duct associated with the temperature of the second cable is switched to the start mode;

[0074] When the temperature of the second cable is within the third operating condition range, all the power exhaust ducts within the preset radius are switched to start-up mode, with the coordinates of the location of the second cable temperature as the center.

[0075] When the temperature of the second cable is within the fourth operating condition range, all the power exhaust ducts in the substation are switched to start-up mode.

[0076] When the temperature of the second cable is within the fifth operating condition range, all the power exhaust ducts in the substation are switched to start-up mode, and an early warning message is generated.

[0077] A second aspect of the present invention provides a thermal management control system for cable trench tunnels in substations, comprising:

[0078] The data acquisition module is used to acquire cable trench dimension data of cable trench tunnels in substations, as well as heat dissipation performance data of power exhaust ducts;

[0079] The exhaust duct distribution module is used to determine the exhaust duct distribution data based on the cable trench dimension data and the heat dissipation performance data;

[0080] The model building module is used to build a cable trench mesh model and determine the position coordinates of each power exhaust duct based on the exhaust duct distribution data;

[0081] The start-up threshold module is used to determine the start-up threshold of the exhaust duct based on the target operating mode of the substation and the heat dissipation performance data.

[0082] The control and management module is used to control the start and stop status of each power exhaust duct based on the comparison result between the target cable temperature at each location coordinate and the start threshold of the exhaust duct.

[0083] As can be seen from the above technical solutions, the present invention has the following advantages:

[0084] In this invention, firstly, the dimensional data of the cable trench tunnel is acquired, and the distribution location and quantity of the power exhaust ducts are determined by combining the heat dissipation performance data of the power exhaust ducts. These ducts are then laid to construct the substation's heat dissipation system. Next, a two-dimensional cable trench mesh model is constructed to determine the coordinates of each power exhaust duct. Based on the substation's operating mode, the corresponding exhaust duct start-up threshold is dynamically set. Finally, based on the comparison between the real-time monitored target cable temperature and the corresponding exhaust duct start-up threshold, the start-up and shutdown states of the power exhaust ducts are intelligently switched. This invention achieves precise, controllable, and continuously efficient heat dissipation in cable trench tunnels by dynamically setting the start-up and shutdown thresholds of the power exhaust ducts and combining this with the comparison of the real-time monitored target cable temperature. This solves the technical problem that existing non-powered exhaust ducts rely entirely on natural wind, which is characterized by high randomness and weak wind force, leading to uncontrollable start-up and shutdown of the exhaust ducts and inconsistent heat dissipation, thus failing to meet the reliable heat dissipation requirements of cable trench tunnels. Attached Figure Description

[0085] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0086] Figure 1 This is a flowchart illustrating the steps of a thermal management control method for a substation cable trench tunnel according to Embodiment 1 of the present invention.

[0087] Figure 2 This is a flowchart illustrating the steps of a thermal management control method for a substation cable trench tunnel according to Embodiment 2 of the present invention.

[0088] Figure 3 This is a cross-sectional view of the improved power exhaust duct;

[0089] Figure 4 This is a schematic diagram of a cable trench mesh model;

[0090] Figure 5 This is a structural block diagram of a thermal management control system for a substation cable trench tunnel provided in Embodiment 3 of the present invention.

[0091] The meanings of the reference numerals in the attached figures are as follows:

[0092] 1. Photovoltaic panels; 2. Cable trench ventilation ducts; 3. Photovoltaic power generation systems; 4. Substation AC power generation systems; 5. Cable laying; 6. Electric motors; 7. Fans. Detailed Implementation

[0093] This invention provides a thermal management control method and system for cable trench tunnels in substations, which solves the technical problem that existing unpowered ventilation ducts rely entirely on natural wind for operation. However, natural wind is characterized by high randomness and weak wind force, resulting in uncontrollable start-up and shutdown of the ventilation ducts and inconsistent heat dissipation, which fails to meet the reliable heat dissipation requirements of cable trench tunnels.

[0094] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0095] Due to the randomness and weakness of natural winds, exhaust ducts are unable to reliably dissipate heat from cables, resulting in frequent instances of exhaust ducts remaining inactive for extended periods. According to on-site statistics, a 500kV substation installed 60 non-powered exhaust ducts to reduce the temperature in its high-voltage cable tunnels. During the high-load, high-temperature summer, an average of approximately 32 exhaust ducts operated for ventilation and cooling during the day, and approximately 38 operated at night. The utilization rate of the exhaust ducts fluctuated between approximately 52% and 63%.

[0096] Furthermore, the strong fluctuations in cable load and the large diurnal temperature range mean that the location of cable hotspots is not fixed. Existing non-powered cooling solutions cannot intelligently adjust cooling power and heat dissipation location according to the hotspot location, and therefore cannot meet the heat dissipation requirements. Cables face severe thermal management problems; if cable temperature accumulates excessively, it may damage the insulation and lead to a fire risk.

[0097] This invention addresses the shortcomings of existing technologies by proposing a thermal management and control scheme for cable trench tunnels in substations. It solves problems such as the inability of traditional schemes to provide continuous and reliable heat dissipation, the mismatch between fixed heat dissipation locations and changing hotspot locations, and the high energy consumption and low efficiency of traditional ventilation and heat dissipation methods.

[0098] Please see Figure 1 , Figure 1 The flowchart illustrates the steps of a thermal management control method for a substation cable trench tunnel provided in Embodiment 1 of the present invention.

[0099] This invention provides a thermal management control method for substation cable trench tunnels, comprising:

[0100] Step 101: Obtain the cable trench dimension data of the cable trench tunnel in the substation, as well as the heat dissipation performance data of the power exhaust duct.

[0101] Cable trench dimension data refers to the dimensional parameters of cable trench tunnels, which are used to assess the laying capacity of power ventilation ducts.

[0102] Heat dissipation performance data refers to a series of key parameters used to determine the number of power exhaust ducts to be installed and the start-up threshold of the power exhaust ducts.

[0103] In this embodiment of the invention, the dimensional data of the cable trenches in the substation cable trench tunnels and the heat dissipation performance data of the power exhaust ducts are obtained.

[0104] Step 102: Determine the distribution data of the exhaust duct based on the cable trench dimension data and heat dissipation performance data.

[0105] The exhaust duct distribution data refers to the number of horizontal and vertical ducts calculated based on the cable trench dimension data and heat dissipation performance data. Then, the ducts are laid with the cooling radius as the spacing. Based on the laying results, the power exhaust duct layout information is generated, which includes the row number and column number of the cable trench where each power exhaust duct is located.

[0106] In this embodiment of the invention, the number of power exhaust ducts to be laid on each cable trench tunnel in the substation is determined based on the obtained cable trench dimension data and heat dissipation performance data. Then, the ducts are laid at intervals with cooling radius as the spacing, and exhaust duct distribution data is generated based on the laying results.

[0107] Step 103: Construct a cable trench mesh model and determine the location coordinates of each power exhaust duct based on the exhaust duct distribution data.

[0108] The cable trench grid model refers to a digital spatial model established using a gridding method based on a two-dimensional plan view of a substation, used to accurately locate power exhaust ducts installed on cable trench tunnels.

[0109] Location coordinates refer to the digital markings used to accurately locate the power exhaust duct.

[0110] In this embodiment of the invention, a digital cable trench grid model of the substation is established based on a two-dimensional plan view of the substation using a gridding method. Then, the distribution data of the ventilation duct is mapped onto the cable trench grid model to obtain the corresponding location coordinates.

[0111] Step 104: Determine the start-up threshold of the exhaust duct based on the target operating mode of the substation and the heat dissipation performance data.

[0112] The target operating mode refers to whether the substation is staffed by maintenance personnel or is unmanned.

[0113] In this embodiment of the invention, the start-up threshold of the exhaust duct under different operating modes is determined based on the target operating mode of the substation and combined with heat dissipation performance data.

[0114] Step 105: Based on the comparison results between the target cable temperature at each location coordinate and the start-up threshold of the exhaust duct, adjust the start-up and stop status of each power exhaust duct.

[0115] The target cable temperature refers to the temperature data of the cable 5 laid under the position coordinates of each power exhaust duct. The measured temperature of the cable 5 laid under the position coordinates can be the average temperature of multiple laid cables 5 or the actual temperature of a single laid cable 5. The temperature collection area of ​​the cable 5 laid under the position coordinates can be the cable within a preset length range.

[0116] In this embodiment of the invention, the start-up threshold of the exhaust duct under different operating modes is first determined according to step 104. Then, the target cable temperature at each location coordinate under different operating modes is collected and compared. Finally, the start-up and shutdown status of each power exhaust duct in the substation under different operating modes is adjusted according to the comparison results.

[0117] In this invention, firstly, the dimensional data of the cable trench tunnel is acquired, and the distribution location and quantity of the power exhaust ducts are determined by combining the heat dissipation performance data of the power exhaust ducts. These ducts are then laid to construct the substation's heat dissipation system. Next, a two-dimensional cable trench grid model is constructed to determine the coordinates of each power exhaust duct. Based on the substation's operating mode, the corresponding exhaust duct start-up threshold is dynamically set. Finally, based on the comparison between the real-time monitored target cable temperature and the corresponding exhaust duct start-up threshold, the start-up and stop states of the power exhaust ducts are intelligently switched. This invention achieves precise, controllable, and continuously efficient heat dissipation in cable trench tunnels by dynamically setting the start-up and stop thresholds of the power exhaust ducts and combining this with the comparison of the real-time monitored target cable temperature to regulate their start-up and stop. This solves the technical problem that existing non-powered exhaust ducts rely entirely on natural wind, which is characterized by high randomness and weak wind force, leading to uncontrollable start-up and stoppage of the exhaust ducts and inconsistent heat dissipation, thus failing to meet the reliable heat dissipation requirements of cable trench tunnels.

[0118] Please see Figure 2 , Figure 2 The flowchart illustrates the steps of a thermal management control method for a substation cable trench tunnel provided in Embodiment 2 of the present invention.

[0119] This invention provides a thermal management control method for substation cable trench tunnels, applied to power exhaust ducts, comprising:

[0120] Step 201: Obtain the cable trench dimension data of the cable trench tunnel in the substation, as well as the heat dissipation performance data of the power exhaust duct.

[0121] Please see Figure 3 , Figure 3 The improved power exhaust duct is shown in cross-sectional view. The power exhaust duct includes photovoltaic panel 1, cable trench duct 2, photovoltaic power generation system 3, substation AC power generation system 4, electric motor 6, and fan 7.

[0122] A photovoltaic panel 1 is installed on the top of the cable trench ventilation duct 2, and the photovoltaic panel 1 is connected to the photovoltaic power generation system 3;

[0123] The bottom opening of the cable trench ventilation duct 2 is connected to the upper end face of the cable trench tunnel;

[0124] The cable trench ventilation duct 2 is equipped with an electric motor 6. The output shaft of the electric motor 6 is connected to a fan 7. The fan 7 is used to dissipate heat from the cables 5 laid in the cable trench tunnel.

[0125] The photovoltaic power generation system 3 is connected to the electric motor 6, and the photovoltaic power generation system 3 is used to provide power to the electric motor 6.

[0126] The substation AC power generation system 4 is connected to the motor 6, and the substation AC power generation system 4 is used to provide backup power for the motor 6.

[0127] Figure 3 The topmost downward-sloping dashed arrow points to the photovoltaic panel 1, indicating the direction of sunlight (light energy) incident and providing energy input for the photovoltaic panel; the ring arrow at the top of the cable trench ventilation duct 2 indicates the direction of rotation of the top hood of the ventilation duct, used to assist in ventilation and prevent backflow; the ring arrow around the fan 7 indicates the direction of rotation of the fan 7 driven by the motor 6 to generate cooling airflow; the dashed arrow inside the cable trench indicates the flow path of the cooling airflow blown out by the fan 7 in the cable trench, the airflow is downward and diffuses to both sides, achieving uniform cooling of the laid cable 5.

[0128] This invention provides an improved power exhaust duct, driven by two sets of power generation systems, providing a reliable guarantee for continuous heat dissipation in cable trench tunnels; by deploying temperature sensors in the cable trench, the temperature distribution inside the trench and the cable can be reconstructed, and the heat dissipation position can be flexibly moved; at the same time, the fan speed can be adaptively adjusted according to the cable temperature, saving power consumption.

[0129] In this embodiment of the invention, the specific implementation process of step 201 is similar to that of step 101, and will not be repeated here.

[0130] Furthermore, the cable trench dimensional data includes the transverse length and longitudinal length of the cable trench.

[0131] Step 202: Calculate the ratio between the transverse length of the cable trench and the cooling radius, and round the result up to obtain the transverse quantity of the exhaust duct.

[0132] In practical implementation, to facilitate the method's implementation, step 202 can be converted into a formulaic encapsulation, where the expression for the number of horizontal exhaust ducts can be as follows:

[0133] ;

[0134] In the formula, This indicates the number of horizontal exhaust ducts. This indicates the lateral length of the cable trench, specifically the longest lateral length of the cable trench. Indicates the cooling radius. This indicates rounding up to the nearest integer.

[0135] It should be noted that the calculation of the horizontal number of exhaust ducts using the cooling radius in this invention is determined by the heat dissipation coverage mechanism of the power exhaust ducts. The maximum effective radial distance that a single power exhaust duct can achieve effective heat dissipation is the core indicator of the heat dissipation performance of the power exhaust duct, representing the heat dissipation length that can be covered on one side of the equipment. The power exhaust ducts are laid linearly with the cooling radius as the spacing to ensure that the heat dissipation areas of adjacent exhaust ducts are seamlessly connected without overlap or waste. When laid out in a straight line along the cable trench, the spacing is set according to the cooling radius. The coverage radius of a single duct is R, and the distance between the centers of two adjacent exhaust ducts is equal to R, so the heat dissipation area can be completely spliced. However, the horizontal length of the cable trench is a one-dimensional linear dimension. To calculate the number of equipment in the linear space, a division operation is required using the effective coverage length on one side of the equipment. This formula can accurately calculate the minimum number of ducts required to fill the entire horizontal cable trench. If the spacing is taken as the cooling diameter 2R, the distance between the centers of two adjacent exhaust ducts is equal to 2R, and the circular heat dissipation area only has external contact, resulting in heat dissipation gaps in the linear area of ​​the cable trench. Moreover, the number calculated based on 2R will be too small, and it will be impossible to achieve heat dissipation without dead angles throughout the entire area. Step 203: Calculate the ratio between the longitudinal length of the cable trench and the cooling radius, and round the result up to obtain the longitudinal quantity of the exhaust duct.

[0136] In practical implementation, to facilitate the method's implementation, step 203 can be converted into a formulaic encapsulation, where the expression for the number of vertical exhaust ducts can be as follows:

[0137] ;

[0138] In the formula, Indicates the number of exhaust ducts in the longitudinal direction. This indicates the longitudinal length of the cable trench, specifically the longest longitudinal length of the cable trench.

[0139] Step 204: Lay out the power exhaust ducts at intervals based on the cooling radius and the number of exhaust ducts in the horizontal and vertical directions.

[0140] In this embodiment of the invention, a number of power exhaust ducts are laid horizontally within the substation, with the cooling radius as the spacing, and a number of power exhaust ducts are laid vertically within the substation.

[0141] Step 205: Generate the distribution data of each power exhaust duct based on the laying results.

[0142] In this embodiment of the invention, the row number and column number of the cable trench where each power exhaust duct is located are obtained based on the laying results.

[0143] Step 206: Construct a cable trench mesh model and determine the location coordinates of each power exhaust duct based on the exhaust duct distribution data.

[0144] Furthermore, step 206 may include the following sub-steps:

[0145] S11. Based on the pre-obtained two-dimensional plan view of the substation, construct a two-dimensional plan model of the cable trench tunnel.

[0146] A two-dimensional plan of a substation refers to the engineering design drawings of a substation.

[0147] A two-dimensional planar model refers to a digital model after extracting the effective geometric information from the two-dimensional planar diagram of a substation and establishing its topological relationships.

[0148] In this embodiment of the invention, a two-dimensional planar model of the cable trench tunnel within the substation is constructed based on a pre-obtained two-dimensional planar diagram of the substation.

[0149] S12. Using the reference point at the entrance of the cable trench tunnel as the origin of the coordinate system, the two-dimensional planar model is divided into meshes according to the preset mesh unit size to obtain the cable trench mesh model; where the x-axis of the cable trench mesh model is the transverse length of the cable trench, and the y-axis is the longitudinal length of the cable trench.

[0150] The cable trench mesh model refers to a two-dimensional planar model after meshing.

[0151] In this embodiment of the invention, the center point of the cable trench tunnel entrance is taken as the origin of the coordinate system, the positive x-axis is along the length of the cable trench tunnel, and the positive y-axis is along the width of the cable trench tunnel. The two-dimensional planar model is divided into grids according to the preset grid unit size to obtain the cable trench grid model.

[0152] S13. Based on the two-dimensional plan view of the substation, the distribution data of the ventilation duct is mapped to the cable trench grid model to obtain the corresponding grid coordinates as location coordinates.

[0153] In this embodiment of the invention, reference parameters (including key layout parameters such as the longitudinal distance of the first row from the reference point, the lateral distance of the first column from the reference point, row spacing, and column spacing) are obtained from a two-dimensional planar diagram. Then, based on the row and column numbers of the power exhaust duct in the cable trench, the precise position coordinates of the equipment in the design coordinate system are determined through linear positioning calculations (specifically, the longitudinal coordinate = first row distance + (row number - 1) × row spacing, and the lateral coordinate = first column distance + (column number - 1) × column spacing). Subsequently, the obtained design coordinates are mapped to the cable trench mesh model, and a mesh discretization algorithm (dividing the difference between the design coordinates and the mesh origin coordinates by the mesh size and rounding down) is used to convert them into the corresponding mesh row and column coordinates.

[0154] The first row distance from the reference point is the coordinate origin of the cable trench grid model (i.e., the reference point at the entrance of the cable trench tunnel). It serves as the absolute measurement starting point for the layout positioning of the power exhaust ducts. The first row distance is the preset design offset length from the reference point along the longitudinal direction of the cable trench to the first row of power exhaust ducts. The two are a direct correspondence between the measurement reference and the corresponding layout dimensions. The row number is the sequential number of each row of power exhaust ducts. The first row is number 1, and the numbers increase sequentially thereafter. For example, if the entrance of the cable trench tunnel is set as the first row distance from the reference point (coordinate origin), and the first row distance is set to 2 meters and the row spacing is set to 3 meters, then the longitudinal coordinate of the exhaust duct of row 1 (first row) is 2 meters, the longitudinal coordinate of the exhaust duct of row 2 is 2 + (2-1) × 3 = 5 meters, and the longitudinal coordinate of the exhaust duct of row 3 is 2 + (3-1) × 3 = 8 meters. The same applies to the horizontal direction. Finally, the accurate coordinate mapping of all power exhaust ducts in the grid model is achieved.

[0155] To avoid bending and twisting cables, outdoor cable trenches in substations are typically laid in straight lines. Based on this characteristic, a coordinate system model is created for the outdoor cable trenches. (See also...) Figure 4 , Figure 4 This is a schematic diagram of a cable trench mesh model, in which... This indicates horizontal numbering. This indicates the column number. This indicates the serial number of the currently installed exhaust duct, with the horizontal axis representing the grid coordinates along the length of the cable trench. The vertical axis represents the grid coordinates along the width of the cable trench. The origin is the reference point at the entrance of the cable trench, and the grid lines are divided in units of single-step grid length, satisfying... , The location of the power exhaust duct at a certain point is The points shown in the figure are standard circles, representing the effective heat dissipation coverage area of ​​a single power exhaust duct on the cable trench plane, with the center located at the grid coordinates. Location; marked The cooling radius corresponding to a single power exhaust duct is a key parameter characterizing the heat dissipation range of the exhaust duct. It is used to determine the arrangement spacing of the exhaust ducts in the grid to ensure that there are no blind spots in the heat dissipation area.

[0156] Step 207: Determine the start-up threshold of the exhaust duct based on the target operating mode of the substation and the heat dissipation performance data.

[0157] Furthermore, the target operating mode includes a first operating mode and a second operating mode, the exhaust duct start-up threshold includes a first start-up threshold and a second start-up threshold, and step 207 may include the following sub-steps:

[0158] S21. When the target operating mode of the substation is the first operating mode, obtain the climate characteristic data of the area where the substation is located.

[0159] The first operating mode refers to the substation being staffed by maintenance personnel.

[0160] Climate characteristic data refers to the current month of the geographical location of the substation. Climate characteristic data includes cold season months and warm season months. Cold season months are defined as (November to March) and warm season months are defined as (April to October).

[0161] In this embodiment of the invention, when the target operating mode of the substation is the first operating mode, that is, when the substation is staffed by maintenance personnel, the current month of the geographical location of the substation is obtained as climate characteristic data.

[0162] S22. Use climate characteristic data to retrieve the preset start-up switching coefficient key value table and match the corresponding first switching coefficient.

[0163] The preset start-up switching coefficient key-value table refers to a pre-built key-value pair data table, with climate characteristic data as the key and the first switching coefficient as the value.

[0164] In this embodiment of the invention, a preset start-up switching coefficient key value table is retrieved using climate characteristic data. When the climate characteristic data of the area to which the substation belongs is a cold season month, the cold season month is used as a key to be entered into the preset start-up switching coefficient key value table for retrieval, and the cold season switching coefficient is output. When the climate characteristic data of the area to which the substation belongs is a warm season month, the warm season month is used as a key to be entered into the preset start-up switching coefficient key value table for retrieval, and the warm season switching coefficient is output.

[0165] S23. Determine the baseline value of heat load efficiency based on the heat dissipation performance data.

[0166] Furthermore, the heat dissipation performance data also includes heat dissipation performance parameters, structural parameters, and airflow performance parameters. The airflow performance parameters include the fan airflow and the exhaust radius. S23 may include the following sub-steps:

[0167] S231. Determine the heat dissipation of the exhaust duct based on the heat dissipation performance parameters and structural parameters.

[0168] Furthermore, the heat dissipation performance parameters include the heat dissipation coefficient and the temperature difference between the inside and outside of the exhaust duct, and the structural parameters include the radius of the exhaust duct. S231 may include the following sub-steps:

[0169] S2311. The vertical projected area of ​​the exhaust duct is obtained by multiplying the square of the exhaust duct radius with the preset value of pi.

[0170] In practical implementation, to simplify the method, the process S2311 can be converted into a formula encapsulation, where the expression for the vertical projected area of ​​the exhaust duct can be as follows:

[0171] ;

[0172] In the formula, This represents the vertical projected area of ​​the exhaust duct. This indicates the default value of pi. This indicates the radius of the exhaust duct.

[0173] In this embodiment of the invention, the vertical projected area of ​​the exhaust duct is calculated based on the heat dissipation performance data using an expression for the vertical projected area of ​​the exhaust duct.

[0174] S2312. The first multiplication value is obtained by multiplying the vertical projected area of ​​the exhaust duct with the heat dissipation coefficient.

[0175] S2313. The heat dissipation of the exhaust duct is calculated by multiplying the first multiplier with the temperature difference between the inside and outside of the exhaust duct.

[0176] In practical implementation, to simplify the method, the process S2312-S2313 can be converted into a formulaic encapsulation, where the expression for the heat dissipation of the exhaust duct can be as follows:

[0177] ;

[0178] In the formula, Represents position coordinates The heat dissipation of the exhaust duct of the power exhaust duct. This represents the heat dissipation coefficient, typically chosen to be between 10 and 15. This indicates the temperature difference between the inside and outside of the exhaust duct.

[0179] In this embodiment of the invention, the heat dissipation of the exhaust duct is calculated by using the vertical projected area of ​​the exhaust duct, the heat dissipation coefficient, and the temperature difference between the inside and outside of the exhaust duct through the expression for the heat dissipation of the exhaust duct.

[0180] S232. Determine the heat dissipation surface area of ​​the exhaust fan based on the structural parameters.

[0181] Furthermore, the structural parameters also include the number of blades, blade length, blade width, and blade thickness. S232 may include the following sub-steps:

[0182] S2321. The second multiplication value is obtained by multiplying the blade length and the blade thickness.

[0183] S2322. The third multiplication value is obtained by multiplying the blade length and blade width.

[0184] S2323. Perform a summation operation using the second and third multipliers to obtain the first sum.

[0185] S2324. Multiply the first sum with the preset first coefficient to obtain the fourth multiplier.

[0186] S2325. The fourth multiplier is used to perform a multiplication operation with the number of blades to obtain the heat dissipation surface area of ​​the exhaust fan.

[0187] In practical implementation, to simplify the method, the process S2321-S2325 can be converted into a formula encapsulation, where the expression for the heat dissipation surface area of ​​the exhaust fan can be as follows:

[0188] ;

[0189] In the formula, This represents the heat dissipation surface area of ​​the exhaust fan, specifically the heat dissipation surface area of ​​the fan inside the exhaust duct (simplified rectangular blades, ignoring torsion and curvature). Indicates the number of leaves. Indicates the blade length. Indicates the blade width. This indicates that the first coefficient is preset. This indicates the thickness of the blade.

[0190] It should be noted that the formula for calculating the heat dissipation surface area of ​​the exhaust fan in this invention... The universal primitive formula for the surface area of ​​a cuboid, derived from basic geometry. ,in These represent the length, width, and height of a cuboid, respectively. Each term in the formula corresponds to the area of ​​a pair of opposite faces of the cuboid. This formula is a fundamental model in engineering for estimating the heat dissipation area of ​​thin-plate components. This application equates the axial fan blades to the length... ,Width ,thick Substituting the rectangular prism into the original formula yields the complete surface area of ​​a single blade, due to the blade thickness. Much smaller than length With width End face area item Since its proportion is extremely small and its contribution to heat dissipation is negligible, it is simplified to the heat dissipation area of ​​a single blade. Multiply by the number of leaves The final formula for the total heat dissipation area is obtained, where This represents the single-face area of ​​the "length × width" face of the equivalent cuboid of the blade, corresponding to the main heat dissipation surface of the blade. The formula represents the single-sided area of ​​the "length × thickness" face of the equivalent cuboid of the blade, and the edge heat dissipation surface corresponding to the blade's length direction. This simplified formula retains the core heat dissipation area, ensures the accuracy of engineering estimation, and reduces computational complexity.

[0191] In this step, the formula is a general standardized calculation formula for the heat dissipation surface area of ​​a single power exhaust fan. It is applicable to the unified calculation of all power exhaust fans and represents the inherent heat dissipation area attribute of the fan blades as a whole. It is not a proprietary parameter bound to grid coordinates or a specific location. In the engineering field, the symbol notation convention of general physical formulas allows for the omission of subscripts for general parameters.

[0192] In this embodiment of the invention, the heat dissipation surface area of ​​the exhaust fan is calculated based on the structural parameters using an expression for the heat dissipation surface area of ​​the exhaust fan.

[0193] S233. The effective ventilation area is obtained by multiplying the square of the air outlet radius with the preset value of pi.

[0194] In practical implementation, to simplify the method, the S233 process can be converted into a formulaic encapsulation, where the expression for the effective ventilation area can be as follows:

[0195] ;

[0196] In the formula, This indicates the effective ventilation area, specifically the area of ​​the circular air outlet of the power exhaust duct. Indicates the radius of the air outlet.

[0197] In this embodiment of the invention, the effective ventilation area is calculated by using the expression for the effective ventilation area based on the square of the air outlet radius and a preset value of pi.

[0198] S234. Calculate the average wind speed at the exhaust duct outlet by performing a ratio calculation based on the fan's air volume and the effective ventilation area.

[0199] In practical implementation, to simplify the method, the S234 process can be converted into a formula encapsulation, where the expression for the average wind speed at the exhaust duct outlet can be as follows:

[0200] ;

[0201] In the formula, Represents position coordinates The average wind speed at the outlet of the power exhaust duct. The airflow of a fan can be obtained from its technical specifications.

[0202] In this embodiment of the invention, the average wind speed at the exhaust duct outlet is calculated using an expression for the average wind speed at the exhaust duct outlet, based on the fan's air volume and the effective ventilation area.

[0203] S235. Determine the baseline value of heat load efficiency based on the heat dissipation of the exhaust duct, the heat dissipation surface area of ​​the exhaust duct fan, the average wind speed at the exhaust duct outlet, structural parameters, and airflow performance parameters.

[0204] Furthermore, the structural parameters also include the blade diameter, and the aerodynamic performance parameters also include the air convection regulation coefficient. S235 may include the following sub-steps:

[0205] S2351. The fifth multiplication value is obtained by multiplying the blade diameter with the average wind speed at the exhaust duct outlet.

[0206] S2352. Multiply the fifth value with the preset value of pi to obtain the sixth value.

[0207] S2353. Calculate the sixth multiplier and perform an exponential operation with the air convection regulation coefficient to obtain the first exponent.

[0208] S2354. The first index is multiplied by the heat dissipation surface area of ​​the exhaust fan to obtain the seventh multiplier.

[0209] S2355. The heat load efficiency benchmark value is obtained by calculating the ratio between the heat dissipation of the exhaust duct and the seventh multiplier.

[0210] In practical implementation, to facilitate the method's implementation, the process S2351-S2355 can be converted into a formulaic encapsulation, where the expression for the heat load performance benchmark value can be as follows:

[0211] ;

[0212] In the formula, Indicates the blade diameter. Indicates the air convection regulation coefficient, usually The higher value is taken during forced convection.

[0213] It should be noted that placing the air convection regulation coefficient in the exponential position here is a mathematical expression that strictly follows the classical theories of fluid mechanics and forced convection heat transfer. The coupling relationship between forced convection heat transfer efficiency and fan outlet wind speed and blade diameter is non-linear and exponential. This coefficient in the exponential position can accurately correct the changes in heat transfer intensity under different convection conditions (natural convection / forced convection), objectively reflect the physical laws of actual convective heat dissipation of the power exhaust fan, ensure that the calculation of the heat load efficiency benchmark value fits the actual heat dissipation characteristics of the project, and conforms to the general modeling form of the correlation formula of classical heat transfer criteria.

[0214] It should be noted that the thermal load efficiency benchmark value is a benchmark parameter that is dynamically corrected based on the system heat dissipation efficiency of the power exhaust duct, and is used to trigger the start-stop control of the power exhaust duct.

[0215] In this embodiment of the invention, the heat load performance benchmark value is calculated by using the expression for the heat load performance benchmark value based on the heat dissipation of the exhaust duct, the heat dissipation surface area of ​​the exhaust duct fan, the average wind speed at the exhaust duct outlet, structural parameters, and airflow performance parameters.

[0216] It is worth mentioning that, since the starting conditions of the power exhaust duct are affected by many factors, the exhaust duct heat dissipation, exhaust duct outlet air velocity, blade diameter, and fan heat dissipation surface area are introduced as the main factors. In the specific implementation, for the convenience of the method, the process S24 and S26 can be converted into a formula encapsulation form. The expression for the exhaust duct starting threshold can be as follows:

[0217] ;

[0218] In the formula, Represents position coordinates The system specifies the start-up threshold for the power exhaust duct, which includes a first start-up threshold and a second start-up threshold. When the target operating mode of the substation is the first operating mode, the first start-up threshold for controlling the start and stop of the power exhaust duct is determined by a first switching coefficient. When the target operating mode of the substation is the second operating mode, the second start-up threshold for controlling the start and stop of the power exhaust duct is determined by a second switching coefficient. This indicates either the first or second switching coefficient, which is determined based on the target operating mode of the substation.

[0219] S24. Determine the first start-up threshold based on the heat load performance benchmark value and the first switching coefficient.

[0220] Furthermore, the first switching coefficient includes a warm season switching coefficient and a cold season switching coefficient, and the first activation threshold includes a warm season activation threshold and a cold season activation threshold. S24 may include the following sub-steps:

[0221] It should be noted that, due to seasonal factors, cables frequently overheat during the high-temperature season (April to October), requiring the intervention of the power exhaust duct in the cable trench for heat dissipation and cooling. During the low-temperature season (November to March), cable overheating is not severe, and the power exhaust duct does not need to be activated for heat dissipation.

[0222] S241. When the first switching coefficient is the warm season switching coefficient, the warm season switching coefficient and the heat load efficiency benchmark value are multiplied to obtain the warm season start-up threshold.

[0223] It is worth mentioning that, in the specific implementation, to facilitate the method's implementation, the S241 process can be converted into a formula encapsulation, where the expression for the warm season initiation threshold can be as follows:

[0224] ;

[0225] In the formula, Indicates the threshold for warm season activation. This indicates the warm season switching coefficient.

[0226] In this embodiment of the invention, the warm season switching coefficient is set to 0, and the warm season start threshold is... It is 0.

[0227] S242. When the first switching coefficient is the cold season switching coefficient, the cold season switching coefficient and the heat load efficiency benchmark value are multiplied to obtain the cold season start-up threshold.

[0228] It is worth mentioning that, in the specific implementation, to facilitate the method's implementation, the S242 process can be converted into a formulaic encapsulation, where the expression for the cold season start threshold can be as follows:

[0229] ;

[0230] In the formula, Indicates the threshold for starting the cold season. This represents the seasonal transition coefficient.

[0231] In this embodiment of the invention, the cold season switching coefficient is set to... , The forced stop value is user-defined and must satisfy the first cable temperature. Less than the cold season start-up threshold If so, the power exhaust duct does not need to be started.

[0232] It should be noted that the first switching coefficient is selected as 0 or... Defined as a manual switching mode, it is used by maintenance personnel to monitor substations.

[0233] S25. When the target operating mode of the substation is the second operating mode, obtain the second switching coefficient associated with the second operating mode.

[0234] The second operating mode refers to the substation being an unmanned substation.

[0235] The second switching factor refers to the preset switching factor, which is usually set to 1.

[0236] In this embodiment of the invention, when the target operating mode of the substation is the second operating mode, the second switching coefficient associated with the second operating mode is obtained.

[0237] S26. The second start-up threshold is obtained by multiplying the thermal load efficiency benchmark value with the second switching coefficient.

[0238] It is worth mentioning that, in the specific implementation, to facilitate the method's implementation, the S26 process can be converted into a formulaic encapsulation, where the expression for the second start-up threshold can be as follows:

[0239] ;

[0240] In the formula, This indicates the second startup threshold. This represents the second switching coefficient.

[0241] In this embodiment of the invention, the second switching coefficient is selected as 1, and is defined as automatic mode. For unattended substations, the starting of the power exhaust duct is subject to a second starting threshold. The impact is automatically adjusted by the cooling system throughout the year.

[0242] Step 208: Based on the comparison results between the target cable temperature at each location coordinate and the start-up threshold of the exhaust duct, adjust the start-up and stop status of each power exhaust duct.

[0243] Furthermore, the target cable temperature includes a first cable temperature and a second cable temperature, and step 208 may include the following sub-steps:

[0244] S31. When the target cable temperature under the location coordinates is the first cable temperature, compare the first cable temperature with the warm season start-up threshold and compare the first cable temperature with the cold season start-up threshold.

[0245] In this embodiment of the invention, when the target cable temperature under the location coordinates is the first cable temperature, the first cable temperature is compared with the warm season start threshold and the first cable temperature is compared with the cold season start threshold.

[0246] S32. When the temperature of the first cable is greater than the warm season start-up threshold, the power exhaust duct associated with the location coordinates will be switched to start-up mode.

[0247] In this embodiment of the invention, the first cable temperature is satisfied. Greater than the warm season start-up threshold ,Right now This allows maintenance personnel to continuously operate the power exhaust ducts inside the substation during the high-temperature season, providing continuous heat dissipation and cooling for the cable trenches and tunnels.

[0248] It should be noted that, since the warm season switching coefficient is set to 0, there is no first cable temperature. Less than or equal to the warm season start-up threshold The situation.

[0249] S33. When the temperature of the first cable is less than the cold season start-up threshold, the power exhaust duct associated with the location coordinates will be switched to shutdown mode.

[0250] In this embodiment of the invention, the first cable temperature is satisfied. Less than the cold season start-up threshold ,Right now This allows maintenance personnel to stop operating the power exhaust ducts inside the substation during the low-temperature season, eliminating the need for heat dissipation in cable trenches and tunnels.

[0251] It should be noted that, due to the cold season switching coefficient being set as follows: , The forced stop value is user-defined and must satisfy the first cable temperature. Less than the cold season start-up threshold Therefore, there is no first cable temperature. Greater than or equal to the cold season start-up threshold The situation.

[0252] S34. When the target cable temperature under the location coordinates is the second cable temperature, the second switching coefficient is used to retrieve the preset state coefficient key value table, and the exhaust duct operating range is determined by combining the second start threshold.

[0253] Furthermore, S34 may include the following sub-steps:

[0254] S341. Use the second switching coefficient to retrieve the preset state coefficient key value table and match the corresponding state coefficient; the state coefficients include the first state coefficient, the second state coefficient, the third state coefficient and the fourth state coefficient, which are all positive real numbers and satisfy a monotonically increasing relationship.

[0255] The preset state coefficient key-value table refers to a pre-built key-value pair data table, with the second switching coefficient as the key and the state coefficient as the value.

[0256] In this embodiment of the invention, a second switching coefficient is used to retrieve a preset state coefficient key value table and match the corresponding state coefficients. The state coefficients include first state coefficients, all of which are positive real numbers. Second state coefficient Third state coefficient and fourth state coefficient And it satisfies a monotonically increasing relationship (that is, ... ).

[0257] S342. The first endpoint value is obtained by multiplying the first state coefficient with the second start threshold.

[0258] In this embodiment of the invention, a first endpoint value is obtained by multiplying a first state coefficient with a second start threshold. .

[0259] S343. The second endpoint value is obtained by multiplying the second state coefficient with the second start threshold.

[0260] In this embodiment of the invention, the second endpoint value is obtained by multiplying the second state coefficient with the second start threshold. .

[0261] S344. The third endpoint value is obtained by multiplying the third state coefficient with the second start threshold.

[0262] In this embodiment of the invention, the third endpoint value is obtained by multiplying the third state coefficient with the second start threshold. .

[0263] S345. The fourth state coefficient is multiplied by the second start threshold to obtain the fourth endpoint value.

[0264] In this embodiment of the invention, the fourth endpoint value is obtained by multiplying the fourth state coefficient with the second start threshold. .

[0265] S346. The operating range of the exhaust duct is determined by using the preset lower limit value, first endpoint value, second endpoint value, third endpoint value, fourth endpoint value and preset upper limit value of the endpoint.

[0266] Furthermore, the operating range of the exhaust duct includes a first operating range, a second operating range, a third operating range, a fourth operating range, and a fifth operating range. S346 may include the following sub-steps:

[0267] S3461. The preset lower limit value of the endpoint and the first endpoint value are used as the two endpoint values ​​of the first working condition interval.

[0268] In this embodiment of the invention, a preset lower limit value and a first endpoint value are used as the two endpoint values ​​of a first working condition interval. The preset lower limit value is preferably 0, and the first working condition interval is specifically... .

[0269] S3462. Use the first endpoint value and the second endpoint value as the two endpoint values ​​of the second working condition interval.

[0270] In this embodiment of the invention, an endpoint value and a second endpoint value are used as the two endpoint values ​​of a second operating condition interval, which is specifically defined as follows: .

[0271] S3463, take the second endpoint value and the third endpoint value as the two endpoint values ​​of the third working condition interval.

[0272] In this embodiment of the invention, the second endpoint value and the third endpoint value are used as the two endpoint values ​​of the third working condition interval, which is specifically defined as follows: .

[0273] S3464. Use the three endpoint values ​​and the fourth endpoint value as the two endpoint values ​​of the fourth working condition interval.

[0274] In this embodiment of the invention, the three endpoint values ​​and the fourth endpoint value serve as the two endpoint values ​​of the fourth operating condition interval, which is specifically defined as follows: .

[0275] S3465. Use the four endpoint values ​​and the preset endpoint upper limit value as the two endpoint values ​​of the fifth working condition interval.

[0276] In this embodiment of the invention, the four endpoint values ​​and the preset endpoint upper limit value are used as the two endpoint values ​​of the fifth working condition interval, and the preset endpoint upper limit value is preferably... The fifth operating condition interval is specifically as follows: .

[0277] S35. Based on the operating range of the exhaust duct where the second cable temperature is located, the power exhaust duct is switched to start-up mode or stop mode according to the associated switching strategy.

[0278] Furthermore, S35 may include the following sub-steps:

[0279] S351. When the temperature of the second cable is in the first operating condition range, the power exhaust duct associated with the temperature of the second cable is switched to the shutdown mode.

[0280] In this embodiment of the invention, when the temperature of the second cable is in the first operating condition range, the power exhaust duct is in a non-starting state, and the power exhaust duct associated with the temperature of the second cable is switched to the shutdown mode.

[0281] S352. When the temperature of the second cable is in the second operating condition range, the power exhaust duct associated with the temperature of the second cable is switched to the start mode.

[0282] In this embodiment of the invention, when the temperature of the second cable is within the second operating condition range, it is at the start-up position coordinate. If the power exhaust duct is in the power exhaust duct state, the power exhaust duct associated with the second cable temperature will be switched to start mode.

[0283] S353. When the temperature of the second cable is in the third operating condition range, all power exhaust ducts within the preset radius are switched to start mode, with the location coordinates of the second cable temperature as the center.

[0284] In this embodiment of the invention, when the temperature of the second cable is in the third operating condition range, it is at the starting position coordinate. If the location and surrounding power exhaust duct status are determined, then all power exhaust ducts within a preset radius will be switched to start mode, with the location coordinates of the second cable temperature as the center.

[0285] S354. When the temperature of the second cable is in the fourth operating condition range, all power exhaust ducts in the substation will be switched to start-up mode.

[0286] In this embodiment of the invention, when the temperature of the second cable is in the fourth operating condition range, it is in the state of starting all power exhaust ducts, and then all power exhaust ducts in the substation are switched to the start mode.

[0287] S355. When the temperature of the second cable is in the fifth operating condition range, all power exhaust ducts in the substation will be switched to start-up mode and an early warning message will be generated.

[0288] In this embodiment of the invention, when the temperature of the second cable is in the fifth operating condition range, and the system is in a background alarm state, all power exhaust ducts in the substation will be switched to start mode, and an early warning message will be generated.

[0289] In unattended substations, that is At this time, the cooling system composed of multiple powered exhaust ducts is in automatic mode. It is specified that there are five equipment states in automatic mode: "exhaust duct not started," "operated," etc. "Exhaust duct" status, "Start" The system is divided into three states: "Point and surrounding exhaust ducts", "Start all exhaust ducts", and "Send alarm from the background". a, b, c, and d are defined as state coefficients, where 0 < a < b < c < d. See the table below:

[0290]

[0291] In this invention, firstly, the dimensional data of the cable trench tunnel is acquired, and the distribution location and quantity of the power exhaust ducts are determined by combining the heat dissipation performance data of the power exhaust ducts. These ducts are then laid to construct the substation's heat dissipation system. Next, a two-dimensional cable trench mesh model is constructed to determine the coordinates of each power exhaust duct. Based on the substation's operating mode, the corresponding exhaust duct start-up threshold is dynamically set. Finally, based on the comparison between the real-time monitored target cable temperature and the corresponding exhaust duct start-up threshold, the start-up and shutdown states of the power exhaust ducts are intelligently switched. This invention achieves precise, controllable, and continuously efficient heat dissipation in cable trench tunnels by dynamically setting the start-up and shutdown thresholds of the power exhaust ducts and combining this with the comparison of the real-time monitored target cable temperature. This solves the technical problem that existing non-powered exhaust ducts rely entirely on natural wind, which is characterized by high randomness and weak wind force, leading to uncontrollable start-up and shutdown of the exhaust ducts and inconsistent heat dissipation, thus failing to meet the reliable heat dissipation requirements of cable trench tunnels.

[0292] Please see Figure 5 , Figure 5 This is a structural block diagram of a thermal management control system for a substation cable trench tunnel provided in Embodiment 3 of the present invention.

[0293] The present invention provides a thermal management control system for cable trench tunnels in substations, comprising:

[0294] The data acquisition module 301 is used to acquire cable trench dimension data of cable trench tunnels in substations, as well as heat dissipation performance data of power exhaust ducts.

[0295] The exhaust duct distribution module 302 is used to determine the exhaust duct distribution data based on the cable trench dimension data and heat dissipation performance data;

[0296] The model building module 303 is used to build a cable trench mesh model and determine the position coordinates of each power exhaust duct based on the exhaust duct distribution data;

[0297] The start-up threshold module 304 is used to determine the start-up threshold of the exhaust duct based on the target operating mode of the substation and the heat dissipation performance data.

[0298] The control and management module 305 is used to control the start and stop status of each power exhaust duct based on the comparison result between the target cable temperature at each location coordinate and the start threshold of the exhaust duct.

[0299] Furthermore, the cable trench dimensional data includes the transverse length and longitudinal length of the cable trench, and the ventilation duct distribution module 302 includes:

[0300] The exhaust duct horizontal quantity submodule is used to calculate the ratio between the cable trench horizontal length and the cooling radius, and then round the result up to obtain the exhaust duct horizontal quantity.

[0301] The exhaust duct longitudinal quantity submodule is used to calculate the ratio between the longitudinal length of the cable trench and the cooling radius, and then round the result up to obtain the exhaust duct longitudinal quantity.

[0302] The power exhaust duct laying sub-module is used to lay power exhaust ducts at intervals based on the cooling radius, according to the number of exhaust ducts in the horizontal direction and the number of exhaust ducts in the vertical direction.

[0303] The laying result output submodule is used to generate the distribution data of each power exhaust duct based on the laying results.

[0304] Furthermore, the model building module 303 includes:

[0305] The cable trench distribution data submodule is used to construct a two-dimensional planar model of the cable trench tunnel based on the pre-acquired two-dimensional planar diagram of the substation.

[0306] The cable trench mesh model submodule is used to divide the two-dimensional plane model into meshes based on the reference point at the entrance of the cable trench tunnel as the origin of the coordinate system and according to the preset mesh unit size, so as to obtain the cable trench mesh model.

[0307] The location coordinates submodule is used to map the distribution data of the ventilation ducts to the cable trench grid model based on the two-dimensional plan view of the substation, and obtain the corresponding grid coordinates as location coordinates.

[0308] Furthermore, the target operating mode includes a first operating mode and a second operating mode, the exhaust duct start-up threshold includes a first start-up threshold and a second start-up threshold, and the start-up threshold module 304 includes:

[0309] The climate characteristic data submodule is used to obtain climate characteristic data of the area where the substation is located when the target operating mode of the substation is the first operating mode.

[0310] The first switching coefficient submodule is used to retrieve a preset start-up switching coefficient key value table using climate characteristic data and match the corresponding first switching coefficient.

[0311] The thermal load performance benchmark value submodule is used to determine the thermal load performance benchmark value based on the heat dissipation performance data.

[0312] The first start-up threshold submodule is used to determine the first start-up threshold based on the heat load performance benchmark value and the first switching coefficient.

[0313] The second switching coefficient submodule is used to obtain the second switching coefficient associated with the second operating mode when the target operating mode of the substation is the second operating mode.

[0314] The second start-up threshold submodule is used to perform a multiplication operation between the thermal load efficiency benchmark value and the second switching coefficient to obtain the second start-up threshold.

[0315] Furthermore, the heat dissipation performance data also includes heat dissipation performance parameters, structural parameters, and airflow performance parameters. Airflow performance parameters include fan airflow and outlet radius. The thermal load performance benchmark submodule includes:

[0316] The exhaust duct heat dissipation unit is used to determine the heat dissipation of the exhaust duct based on heat dissipation performance parameters and structural parameters.

[0317] The exhaust fan heat dissipation surface area unit is used to determine the exhaust fan heat dissipation surface area based on structural parameters.

[0318] The effective ventilation area unit is used to calculate the effective ventilation area by multiplying the square of the air outlet radius by a preset value of pi.

[0319] The average wind speed unit at the exhaust duct outlet is used to calculate the average wind speed at the exhaust duct outlet by comparing the fan's air volume with the effective ventilation area.

[0320] The reference value output unit is used to determine the thermal load efficiency reference value based on the heat dissipation of the exhaust duct, the heat dissipation surface area of ​​the exhaust duct fan, the average wind speed at the exhaust duct outlet, structural parameters, and airflow performance parameters.

[0321] Furthermore, the first switching coefficient includes a warm season switching coefficient and a cold season switching coefficient, the first activation threshold includes a warm season activation threshold and a cold season activation threshold, and the first activation threshold submodule includes:

[0322] The warm season start-up threshold unit is used to calculate the warm season start-up threshold by multiplying the warm season switching coefficient with the heat load efficiency benchmark value when the first switching coefficient is the warm season switching coefficient.

[0323] The cooling season start-up threshold unit is used to calculate the cooling season start-up threshold by multiplying the cooling season switching coefficient with the heat load efficiency benchmark value when the first switching coefficient is the cooling season switching coefficient.

[0324] Furthermore, the heat dissipation performance parameters include the heat dissipation coefficient and the temperature difference between the inside and outside of the exhaust duct, the structural parameters include the exhaust duct radius, and the heat dissipation unit of the exhaust duct includes:

[0325] The vertical projection area sub-unit of the exhaust duct is used to perform a multiplication operation by multiplying the square of the exhaust duct radius with a preset value of pi to obtain the vertical projection area of ​​the exhaust duct.

[0326] The first multiplication subunit is used to perform a multiplication operation by multiplying the vertical projected area of ​​the exhaust duct with the heat dissipation coefficient to obtain the first multiplication value;

[0327] The heat dissipation output subunit is used to perform a multiplication calculation by taking the first multiplier and the temperature difference between the inside and outside of the exhaust duct, and then calculating the heat dissipation of the exhaust duct.

[0328] Furthermore, the structural parameters also include the number of blades, blade length, blade width, and blade thickness. The exhaust fan heat dissipation surface area unit includes:

[0329] The second multiplication subunit is used to perform a multiplication operation on the blade length and the blade thickness to obtain the second multiplication value;

[0330] The third multiplication subunit is used to perform a multiplication operation on the blade length and blade width to obtain the third multiplication value;

[0331] The first sum subunit is used to perform a sum operation using the second and third multiplication values ​​to obtain the first sum.

[0332] The fourth multiplication subunit is used to perform a multiplication operation by multiplying the first sum with a preset first coefficient to obtain the fourth multiplication value;

[0333] The surface area output subunit is used to perform a multiplication operation by using the fourth multiplier and the number of blades to obtain the heat dissipation surface area of ​​the exhaust fan.

[0334] Furthermore, the structural parameters also include blade diameter, and the aerodynamic performance parameters include air convection regulation coefficient. The reference value output unit includes:

[0335] The fifth multiplication subunit is used to perform a multiplication operation by multiplying the blade diameter with the average wind speed at the exhaust duct outlet to obtain the fifth multiplication value.

[0336] The sixth multiplication subunit is used to perform a multiplication operation between the fifth multiplication value and the preset value of pi to obtain the sixth multiplication value;

[0337] The first exponential subunit is used to calculate the sixth multiplier and the air convection regulation coefficient to perform an exponential operation to obtain the first exponent;

[0338] The seventh multiplication subunit is used to perform a multiplication operation by multiplying the first exponent with the heat dissipation surface area of ​​the exhaust fan to obtain the seventh multiplication value;

[0339] The baseline value calculation subunit is used to calculate the ratio between the heat dissipation of the exhaust duct and the seventh multiplier to obtain the baseline value of the heat load efficiency.

[0340] Furthermore, the target cable temperature includes a first cable temperature and a second cable temperature, and the control management module 305 includes:

[0341] The first comparison submodule is used to compare the first cable temperature with the warm season start threshold and the first cable temperature with the cold season start threshold when the target cable temperature at the location coordinate is the first cable temperature.

[0342] The first processing submodule is used to switch the power exhaust duct associated with the location coordinates to the start-up mode when the temperature of the first cable is greater than the warm season start-up threshold.

[0343] The second processing submodule is used to switch the power exhaust duct associated with the location coordinates to shutdown mode when the temperature of the first cable is less than the cold season start-up threshold.

[0344] The exhaust duct operating condition interval submodule is used to determine the exhaust duct operating condition interval by using the second switching coefficient to retrieve the preset state coefficient key value table when the target cable temperature under the position coordinate is the second cable temperature, and combining it with the second start threshold.

[0345] The third processing submodule is used to switch the power exhaust duct to start mode or stop mode according to the operating condition range of the exhaust duct where the temperature of the second cable is located, based on the associated switching strategy.

[0346] Furthermore, the exhaust duct operating condition zone submodule includes:

[0347] The state coefficient unit is used to retrieve the preset state coefficient key value table using the second switching coefficient and match the corresponding state coefficient.

[0348] The state coefficients include the first state coefficient, the second state coefficient, the third state coefficient, and the fourth state coefficient, all of which are positive real numbers, and they satisfy a monotonically increasing relationship.

[0349] The first endpoint value unit is used to perform a multiplication operation between the first state coefficient and the second start threshold to obtain the first endpoint value;

[0350] The second endpoint value unit is used to perform a multiplication operation between the second state coefficient and the second start threshold to obtain the second endpoint value;

[0351] The third endpoint value unit is used to perform a multiplication operation between the third state coefficient and the second start threshold to obtain the third endpoint value;

[0352] The fourth endpoint value unit is used to perform a multiplication operation between the fourth state coefficient and the second start threshold to obtain the fourth endpoint value;

[0353] The operating condition range determination unit is used to determine the operating condition range of the exhaust duct by using the preset lower limit value, first endpoint value, second endpoint value, third endpoint value, fourth endpoint value and preset upper limit value.

[0354] Furthermore, the operating condition range of the exhaust duct includes a first operating condition range, a second operating condition range, a third operating condition range, a fourth operating condition range, and a fifth operating condition range, and the operating condition range determination unit includes:

[0355] The first working condition interval sub-unit is used to take the preset lower limit value of the endpoint and the first endpoint value as the two endpoint values ​​of the first working condition interval.

[0356] The second working condition interval sub-unit is used to take the first endpoint value and the second endpoint value as the two endpoint values ​​of the second working condition interval.

[0357] The third working condition interval sub-unit is used to take the second endpoint value and the third endpoint value as the two endpoint values ​​of the third working condition interval;

[0358] The fourth working condition interval sub-unit is used to take the three endpoint values ​​and the fourth endpoint value as the two endpoint values ​​of the fourth working condition interval.

[0359] The fifth working condition interval sub-unit is used to take the four endpoint values ​​and the preset endpoint upper limit value as the two endpoint values ​​of the fifth working condition interval.

[0360] Furthermore, the third processing submodule includes:

[0361] The first switching strategy unit is used to switch the power exhaust duct associated with the second cable temperature to shutdown mode when the second cable temperature is in the first operating condition range.

[0362] The second switching strategy unit is used to switch the power exhaust duct associated with the second cable temperature to the start mode when the second cable temperature is in the second operating condition range.

[0363] The third switching strategy unit is used to switch all power exhaust ducts within a preset radius to start mode when the temperature of the second cable is in the third operating condition range, with the location coordinates of the second cable temperature as the center.

[0364] The fourth switching strategy unit is used to switch all power exhaust ducts in the substation to start-up mode when the temperature of the second cable is in the fourth operating condition range.

[0365] The fifth switching strategy unit is used to switch all power exhaust ducts in the substation to startup mode and generate early warning information when the temperature of the second cable is in the fifth operating condition range.

[0366] In this invention, firstly, the dimensional data of the cable trench tunnel is acquired, and the distribution location and quantity of the power exhaust ducts are determined by combining the heat dissipation performance data of the power exhaust ducts. These ducts are then laid to construct the substation's heat dissipation system. Next, a two-dimensional cable trench mesh model is constructed to determine the coordinates of each power exhaust duct. Based on the substation's operating mode, the corresponding exhaust duct start-up threshold is dynamically set. Finally, based on the comparison between the real-time monitored target cable temperature and the corresponding exhaust duct start-up threshold, the start-up and shutdown states of the power exhaust ducts are intelligently switched. This invention achieves precise, controllable, and continuously efficient heat dissipation in cable trench tunnels by dynamically setting the start-up and shutdown thresholds of the power exhaust ducts and combining this with the comparison of the real-time monitored target cable temperature. This solves the technical problem that existing non-powered exhaust ducts rely entirely on natural wind, which is characterized by high randomness and weak wind force, leading to uncontrollable start-up and shutdown of the exhaust ducts and inconsistent heat dissipation, thus failing to meet the reliable heat dissipation requirements of cable trench tunnels.

[0367] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0368] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0369] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0370] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for thermal management and control of cable trench tunnels in substations, characterized in that, include: Obtain cable trench dimension data and power exhaust duct heat dissipation performance data for cable trench tunnels within the substation. Based on the cable trench dimension data and the heat dissipation performance data, determine the exhaust duct distribution data; A cable trench mesh model is constructed, and the position coordinates of each power exhaust duct are determined based on the exhaust duct distribution data; The start-up threshold of the exhaust duct is determined based on the target operating mode of the substation and the heat dissipation performance data. The target operating mode includes a first operating mode and a second operating mode, and the exhaust duct start-up threshold includes a first start-up threshold and a second start-up threshold. Determining the exhaust duct start-up threshold based on the substation's target operating mode and the heat dissipation performance data includes: When the target operating mode of the substation is the first operating mode, obtain the climate characteristic data of the area where the substation is located; The climate characteristic data is used to retrieve the preset start-up switching coefficient key value table and match the corresponding first switching coefficient; Based on the aforementioned heat dissipation performance data, determine the baseline value for heat load efficiency; The first start-up threshold is determined based on the heat load efficiency benchmark value and the first switching coefficient; When the target operating mode of the substation is the second operating mode, obtain the second switching coefficient associated with the second operating mode; The second start-up threshold is obtained by multiplying the heat load efficiency benchmark value with the second switching coefficient. Based on the comparison between the target cable temperature at each of the specified location coordinates and the start-up threshold of the exhaust duct, the start-up and stop status of each of the power exhaust ducts is adjusted.

2. The thermal management and control method for substation cable trench tunnels according to claim 1, characterized in that, The cable trench dimensional data includes the transverse length and longitudinal length of the cable trench, and the heat dissipation performance data includes the cooling radius. Determining the exhaust duct distribution data based on the cable trench dimensional data and the heat dissipation performance data includes: The horizontal length of the cable trench is calculated by ratioing the cooling radius, and the result is rounded up to obtain the horizontal quantity of the exhaust duct. The longitudinal length of the cable trench is calculated by ratioing the cooling radius, and the result is rounded up to obtain the longitudinal number of exhaust ducts. Power exhaust ducts are laid with the cooling radius as the spacing, according to the number of horizontal and vertical exhaust ducts; Based on the laying results, the distribution data of each power exhaust duct is generated.

3. The thermal management and control method for substation cable trench tunnels according to claim 1, characterized in that, The construction of the cable trench mesh model and the determination of the position coordinates of each power exhaust duct based on the exhaust duct distribution data include: Based on the pre-obtained two-dimensional plan view of the substation, construct a two-dimensional plan model of the cable trench tunnel; Using the reference point at the entrance of the cable trench tunnel as the origin of the coordinate system, the two-dimensional planar model is divided into grids according to the preset grid unit size to obtain the cable trench grid model. Based on the two-dimensional plan view of the substation, the distribution data of the ventilation duct is mapped to the cable trench grid model to obtain the corresponding grid coordinates as location coordinates.

4. The thermal management and control method for substation cable trench tunnels according to claim 1, characterized in that, The first switching coefficient includes a warm season switching coefficient and a cold season switching coefficient; the first activation threshold includes a warm season activation threshold and a cold season activation threshold; determining the first activation threshold based on the heat load efficiency benchmark value and the first switching coefficient includes: When the first switching coefficient is the warm season switching coefficient, the warm season switching coefficient is multiplied by the heat load efficiency benchmark value to obtain the warm season start-up threshold. When the first switching coefficient is the same as the cold season switching coefficient, the cold season switching coefficient is multiplied by the heat load efficiency benchmark value to obtain the cold season start threshold.

5. The thermal management and control method for substation cable trench tunnels according to claim 4, characterized in that, The target cable temperature includes a first cable temperature and a second cable temperature. The step of adjusting the start / stop state of each powered exhaust duct based on the comparison result between the target cable temperature at each of the specified location coordinates and the exhaust duct start-up threshold includes: When the target cable temperature at the location coordinates is the first cable temperature, the first cable temperature is compared with the warm season start-up threshold, and the first cable temperature is compared with the cold season start-up threshold. When the temperature of the first cable is greater than the warm season start-up threshold, the power exhaust duct associated with the location coordinates is switched to start-up mode. When the temperature of the first cable is less than the cold season start-up threshold, the power exhaust duct associated with the location coordinates is switched to shutdown mode. When the target cable temperature at the location coordinates is the second cable temperature, the second switching coefficient is used to retrieve the preset state coefficient key value table, and the exhaust duct operating range is determined in combination with the second start threshold. Based on the operating range of the exhaust duct where the temperature of the second cable is located, the power exhaust duct is switched to start-up mode or stop mode according to the associated switching strategy.

6. The thermal management and control method for substation cable trench tunnels according to claim 5, characterized in that, The step of using the second switching coefficient to retrieve the preset state coefficient key value table and combining it with the second start threshold to determine the exhaust duct operating condition range includes: The second switching coefficient is used to retrieve the preset state coefficient key value table and match the corresponding state coefficient; The state coefficients include a first state coefficient, a second state coefficient, a third state coefficient, and a fourth state coefficient, all of which are positive real numbers, and satisfy a monotonically increasing relationship; The first endpoint value is obtained by multiplying the first state coefficient with the second start threshold. The second endpoint value is obtained by multiplying the second state coefficient with the second start threshold. The third endpoint value is obtained by multiplying the third state coefficient with the second start threshold. The fourth endpoint value is obtained by multiplying the fourth state coefficient with the second start threshold. The operating range of the exhaust duct is determined by using the preset lower limit value, the first endpoint value, the second endpoint value, the third endpoint value, the fourth endpoint value, and the preset upper limit value.

7. The thermal management and control method for substation cable trench tunnels according to claim 6, characterized in that, The exhaust duct operating condition range includes a first operating condition range, a second operating condition range, a third operating condition range, a fourth operating condition range, and a fifth operating condition range. Determining the exhaust duct operating condition range using a preset lower limit value, a first endpoint value, a second endpoint value, a third endpoint value, a fourth endpoint value, and a preset upper limit value includes: The preset lower limit value of the endpoint and the first endpoint value are used as the two endpoint values ​​of the first working condition interval; The first endpoint value and the second endpoint value are used as the two endpoint values ​​of the second working condition interval; The second endpoint value and the third endpoint value are used as the two endpoint values ​​of the third working condition interval; The third endpoint value and the fourth endpoint value are used as the two endpoint values ​​of the fourth working condition interval; The fourth endpoint value and the preset endpoint upper limit value are used as the two endpoint values ​​of the fifth working condition interval.

8. The thermal management and control method for substation cable trench tunnels according to claim 7, characterized in that, The step of switching the powered exhaust duct to start-up or stop-down mode according to the associated switching strategy based on the operating condition range of the exhaust duct where the temperature of the second cable is located includes: When the temperature of the second cable is within the first operating range, the power exhaust duct associated with the temperature of the second cable is switched to shutdown mode. When the temperature of the second cable is within the second operating condition range, the power exhaust duct associated with the temperature of the second cable is switched to the start mode; When the temperature of the second cable is within the third operating condition range, all the power exhaust ducts within the preset radius are switched to start-up mode, with the coordinates of the location of the second cable temperature as the center. When the temperature of the second cable is within the fourth operating condition range, all the power exhaust ducts in the substation are switched to start-up mode. When the temperature of the second cable is within the fifth operating condition range, all the power exhaust ducts in the substation are switched to start-up mode, and an early warning message is generated.

9. A thermal management control system for cable trench tunnels in substations, characterized in that, The substation cable trench tunnel thermal management control system is used to implement the substation cable trench tunnel thermal management control method as described in any one of claims 1-8, and the substation cable trench tunnel thermal management control system includes: The data acquisition module is used to acquire cable trench dimension data of cable trench tunnels in substations, as well as heat dissipation performance data of power exhaust ducts; The exhaust duct distribution module is used to determine the exhaust duct distribution data based on the cable trench dimension data and the heat dissipation performance data; The model building module is used to build a cable trench mesh model and determine the position coordinates of each power exhaust duct based on the exhaust duct distribution data; The start-up threshold module is used to determine the start-up threshold of the exhaust duct based on the target operating mode of the substation and the heat dissipation performance data. The control and management module is used to control the start and stop status of each power exhaust duct based on the comparison result between the target cable temperature at each location coordinate and the start threshold of the exhaust duct.

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