A vertical layout method for the main transformer heat dissipation device of an offshore booster station

Abstract

The present invention provides a method for vertically arranging the main transformer cooling device of an offshore booster station. In combination with the design requirements of the main transformer cooling device of the offshore booster station, the main transformer cooling device of the offshore booster station is vertically arranged. On the one hand, the vertical arrangement of the main transformer radiator increases the oil flow rate in the radiator and its convection with air, fully exerts its heat dissipation effect, effectively reduces the transformer temperature, and reduces the operation loss of the transformer; on the other hand, arranging the main transformer radiator on the outer wall of the first floor of the offshore booster station can greatly save the area of the bottom platform of the offshore booster station, reduce the area of the bottom platform, and thus reduce the investment cost of the offshore booster station. The present invention solves the problem that the existing main transformer cooling device of the offshore booster station occupies a large area of the bottom platform, and realizes the reduction of cost and increase of efficiency in the development of offshore wind power.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy, and relates to a layout method for an offshore booster station. Background Art

[0002] In recent years, offshore wind power has developed rapidly due to the stability of sea wind resources and the large power generation capacity. In order to achieve the goal of grid parity for offshore wind power, cost reduction and efficiency improvement are the only way for the development of offshore wind power. As an important part of an offshore wind farm, the construction of an offshore booster station is complex and costly, which is the key restricting the development and utilization of offshore wind power. Therefore, by optimizing the design of the offshore booster station and reducing the platform area of the offshore booster station, the development cost of the offshore booster station can be greatly reduced.

[0003] At present, the overall layout of the offshore booster station adopts the split installation layout principle of placing the main transformer indoors and the radiator outdoors on the terrace. With the increase in the development capacity of offshore wind power, the capacity of the main transformer and its heat dissipation requirements increase accordingly. Correspondingly, the number and volume of the main transformer radiators increase, occupying a large outdoor space and area on the first floor of the offshore booster station, making it difficult to reduce the platform area of the offshore booster station. In addition, when the radiator is horizontally arranged on the outdoor terrace, the air circulation at the bottom of the radiator is restricted to a certain extent, which is not conducive to the convective heat dissipation between the radiator and the air. Summary of the Invention

[0004] To solve the problems described in the background art, the present invention provides a vertical layout method for the main transformer heat dissipation device of an offshore booster station.

[0005] The technical solution of the present invention includes the following steps:

[0006] Step 1: Determine the unit box width B, unit box spacing d, and unit box quantity N of the fin radiator of the main transformer heat dissipation device according to the capacity and outer contour dimensions of the main transformer of the offshore booster station;

[0007] Step 2: Establish a vertical layout geometric model of the transformer - radiator, and obtain the change relationship curve between the transformer temperature and the central height of the fin radiator through analysis by Fluent software;

[0008] Step 3: Use the numerical fitting method to obtain the analytical expression of the function of the main transformer temperature and the radiator height, and determine the optimal central height of the vertical layout of the fin radiator;

[0009] Step 4: Arrange the fin radiator on the outer wall of the first floor of the offshore booster station in a wall - mounted installation manner according to the optimal central height of the vertical layout of the fin radiator.

[0010] Further, in step 1, in the expanded length B of the fin radiator unit box 0On the basis of the height H of the unit box, determine the width B of the fin radiator unit box and the distance d between unit boxes according to the capacity and outline dimensions of the main transformer, and according to the optional dimension specifications. Calculate the quantity N of fin radiator unit boxes according to the heat generation Q of the transformer 变 and the heat dissipation Q of the fin radiator 散 Calculate the quantity N of fin radiator unit boxes

[0011] Furthermore, the quantity N of fin radiator unit boxes is calculated according to the following formula

[0012] Convective heat dissipation area of the fin radiator: S D = 2×B 0 ×H×N×10 -6 (m 2 )

[0013] Radiative heat dissipation area of the fin radiator: S F = (2×B×d×N + B×H)×10 -6 (m 2 )

[0014] Self-cooling radiator surface coefficient of the fin radiator: β = (55S D + 45S F ) / 100S D

[0015] Effective heat dissipation area of the fin radiator: S 散 = μ×k×β×S D (m 2 )

[0016] Among them, B 0 is the unfolded length of the width of the fin radiator unit box, in mm; B is the width of the fin radiator unit box, in mm; H is the height of the fin radiator unit box, in mm; N is the quantity of fin radiator unit boxes; d is the distance between fin radiator unit boxes, in mm; μ is the structure coefficient, i.e., the correction coefficient for the distance between fin radiator unit boxes; k is the correction coefficient for the quantity of fin radiator unit boxes

[0017] The quantity N of fin radiator unit boxes is calculated according to the following formula

[0018]

[0019] Among them, represents the mathematical notation of rounding up; Q 变 is the heat generation of the transformer, Q 变 = Q 空载 + Q 负载 , Q 空载 is the load loss of the main transformer, Q 负载 is the no-load loss of the main transformer; Q 散 ​For the heat dissipation of the flat-panel radiator, Q 散 = 2×h×S 散 (T s - T 0 ), where, T s is the heat source temperature; T 0 is the ambient air temperature; h is the convective heat transfer coefficient, H is the height of the flat-panel radiator unit box.

[0020] Furthermore, in the second step, according to the unit box width B, unit box spacing d, and unit box quantity N of the flat-panel radiator, a simplified two-dimensional model of the transformer and the flat-panel radiator is established in AutoCAD software; then, the simplified two-dimensional model is imported into Gambit software for boundary type specification and pre-processing of mesh generation; then, the mesh model established in Gambit is transferred into Fluent software to simulate the temperature field distribution inside the transformer and the radiator; finally, by changing the center height of the flat-panel radiator and repeating the above steps, the data of the change law of the transformer temperature with the center height of the flat-panel radiator are obtained, and the change relationship curve between the transformer temperature and the center height of the flat-panel radiator is plotted.

[0021] Furthermore, in the third step, the numerical fitting boundary, that is, the number of polynomial terms and the fitting error, is determined, and the least squares method is used to perform polynomial fitting on the above relationship curve to obtain the analytical expression of the function of the main transformer temperature and the radiator center height:

[0022]

[0023] where, T 变 is the transformer temperature; x is the center height of the flat-panel radiator; m is the specified number of polynomial terms; a n is the polynomial coefficient;

[0024] Based on the above formula, with the lowest main transformer temperature set as the optimization goal, the optimal center height h opt ;

[0025] min T 变

[0026] s.t. h min ≤ x ≤ h max

[0027] where, h min and h max are the minimum and maximum values of the center height of the flat-panel radiator.

[0028] Compared with the prior art, in combination with the design requirements of the main transformer cooling device of the offshore booster station, the main transformer cooling device of the offshore booster station is vertically arranged. On the one hand, the vertical arrangement of the main transformer radiator increases the oil flow rate in the radiator and its convection with air, giving full play to its heat dissipation effect, effectively reducing the transformer temperature, and reducing the operation loss of the transformer. On the other hand, arranging the main transformer radiator on the outer wall of the first floor of the offshore booster station can greatly save the area of the bottom platform of the offshore booster station, reduce the area of the bottom platform, and thus reduce the investment cost of the offshore booster station. The present invention solves the problem that the existing main transformer cooling device of the offshore booster station occupies a large area of the bottom platform, and realizes the cost reduction and efficiency increase of offshore wind power development. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a flowchart of the method of the present invention.

[0030] Figure 2 is a simplified two-dimensional model diagram of the transformer and the fin radiator.

[0031] Figure 3 is a curve graph showing the change relationship between the transformer temperature and the central height of the fin radiator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] A method for vertically arranging the main transformer cooling device of an offshore booster station, the flowchart is as Figure 1 shown, and is specifically described as follows.

[0034] Step 1: Determine the unit box width B, unit box spacing d, and unit box quantity N of the fin radiator of the main transformer cooling device according to the capacity and outer contour dimensions of the main transformer of the offshore booster station.

[0035] Specifically, on the basis of the unfolded length B 0 of the unit box of the fin radiator and the unit box height H, according to the capacity and outer contour dimensions of the main transformer, determine the unit box width B and unit box spacing d of the fin radiator according to the optional dimension specifications, and according to the heat generation Q 变 of the transformer and the heat dissipation Q 散Calculate the number N of the finned radiator unit boxes. Among them, it is stated in DL / T 1266-2013 "Guide for Selection of Finned Radiators for Transformers" that "select the geometric dimensions of the finned radiator according to the transformer capacity and outer contour dimensions". The wider the width B of the unit box of the finned radiator and the larger the unit box spacing d, the larger the radiator size, the greater the oil flow rate, and the better the heat dissipation effect. Therefore, for large-capacity main transformers, it is recommended to select a large-width B and unit box spacing d of the unit box; but at the same time, factors such as the relative size between the transformer body and the radiator, the overall weight center, and the overall floor area need to be comprehensively considered, and it can be determined according to the actual application requirements. According to DL / T 1266-2013 "Guide for Selection of Finned Radiators for Transformers", the width B of the unit box of the finned radiator can be: 320 mm, 460 mm, 480 mm, 520 mm; all optional dimensions of the unit box spacing d can be calculated based on the value of the width B of the unit box and Table B.1 in DL / T 1266-2013 "Guide for Selection of Finned Radiators for Transformers".

[0036] Specifically, the number N of the finned radiator unit boxes is calculated according to the following formula:

[0037] Convective heat dissipation area of the finned radiator: S D = 2 × B 0 × H × N × 10 -6 (m 2 );

[0038] Radiative heat dissipation area of the finned radiator: S F = (2 × B × d × N + B × H) × 10 -6 (m 2 );

[0039] Self-cooled radiator surface coefficient of the finned radiator: β = (55S D + 45S F ) / 100S D ;

[0040] Effective heat dissipation area of the finned radiator: S 散 = μ × k × β × S D (m 2 );

[0041] Among them, B 0 is the unfolded length of the width of the unit box of the finned radiator, in mm; B is the width of the unit box of the finned radiator, in mm; H is the height of the unit box of the finned radiator, in mm; N is the number of the finned radiator unit boxes; d is the unit box spacing of the finned radiator, in mm; μ is the structure coefficient, that is, the unit box distance correction coefficient of the finned radiator; k is the unit box number correction coefficient of the finned radiator.

[0042] The number N of the finned radiator unit boxes is calculated according to the following formula:

[0043]

[0044] Wherein, represents the mathematical representation of rounding up; Q 变 is the heat generation of the transformer, Q 变 = Q 空载 + Q 负载 , Q 空载 is the load loss of the transformer, Q 负载 is the no-load loss of the transformer. After the transformer model is determined, the load loss and no-load loss parameters can be determined by referring to the power transformer parameter table in the standard GB / T 6451-2015 "Technical Parameters and Requirements for Oil-Immersed Power Transformers"; Q 散 is the heat dissipation of the finned radiator, Q 散 = 2×h×S 散 (T s - T 0 ), wherein, T s is the heat source temperature; T 0 is the ambient air temperature; h is the convective heat transfer coefficient, H is the height of the finned radiator unit box.

[0045] Step 2: Establish a vertical layout geometric model of the transformer-radiator, and obtain the curve of the change relationship between the transformer temperature and the central height of the finned radiator through Fluent software analysis.

[0046] Specifically, according to the unit box width B, unit box spacing d and the number N of the finned radiator unit boxes, establish a simplified two-dimensional model of the transformer and the finned radiator in AutoCAD software, as Figure 2 shown; then, import the simplified two-dimensional model into Gambit software for boundary type designation and pre-processing of mesh generation to obtain a triangular structured mesh model; then, transfer the triangular structured mesh model established in Gambit into Fluent software to simulate the distribution of the internal temperature field of the transformer and the radiator; finally, change the central height of the finned radiator, repeat the above steps, obtain the data of the change law of the transformer temperature with the central height of the finned radiator, and draw the curve of the change relationship between the transformer temperature and the central height of the finned radiator.

[0047] Step 3: Use the numerical fitting method to obtain the analytical expression of the function of the main transformer temperature and the radiator height, and determine the optimal central height of the vertical layout of the finned radiator.

[0048] Specifically, the numerical fitting boundary, i.e., the number of polynomial terms and the fitting error, is determined, and the least squares method is used to perform polynomial fitting on the above relationship curve to obtain the analytical expression of the function of the main transformer temperature and the center height of the radiator:

[0049]

[0050] Among them, T 变 is the transformer temperature; x is the center height of the finned radiator; m is the specified number of polynomial terms; a n is the polynomial coefficient;

[0051] Based on the above formula, taking the lowest main transformer temperature as the optimization objective, the optimal center height h opt ;

[0052] min T 变

[0053] s.t. h min ≤x≤h max

[0054] Among them, h min and h max are the minimum and maximum values of the center height of the finned radiator.

[0055] Step 4: Arrange the finned radiator on the outer wall of the first floor of the offshore booster station by means of wall-mounted installation according to the optimal center height of the vertical arrangement of the finned radiator.

[0056] And by designing a diagonal bracing structure, the stiffness of the support structure is effectively increased and the seismic resistance of the support structure is enhanced.

[0057] Embodiment

[0058] According to Step 1, the capacity of the main transformer of the offshore booster station is 300 MVA, and the external contour dimensions of the main transformer body are length × width × height = 8450 × 2920 × 7830 mm.

[0059] According to the calculation and DL / T 1266-2013 "Guide for Selection of Finned Radiators for Transformers", the unit box width B, unit box spacing d, and unit box quantity N of the finned radiator of the main transformer cooling device are: B = 520 mm, d = 620 mm, N = 36.

[0060] According to Step 2, a geometric model of the vertical arrangement of the transformer-radiator is established, and the change relationship curve of the transformer temperature and the center height of the finned radiator is obtained through analysis by Fluent software, as Figure 3 shown.

[0061] According to Step 3, the analytical expression of the function of the main transformer temperature and the radiator height is obtained by numerical fitting method, and the optimal central height of the vertical arrangement of the fin radiator is determined.

[0062] Define the numerical fitting boundary, that is, the number of polynomial terms and the fitting error. Use the least squares method to perform polynomial fitting on the above relationship curve, and obtain the analytical expression of the function of the main transformer temperature and the radiator central height:

[0063] T 变 = f(x) = 0.3278x^4 - 4.6658x 3 + 24.99x 2 - 61.044x + 390.6

[0064] In the formula, T 变 is the transformer temperature; x is the central height of the fin radiator.

[0065] Based on the above formula, set the lowest main transformer temperature as the optimization goal, and solve the optimal central height h opt ;

[0066] min T 变

[0067] s.t. h min ≤ x ≤ h max

[0068] In the formula, h min and h max are the minimum and maximum values of the central height of the fin radiator.

[0069] According to the above formula, the optimal central height of the radiator in this scenario is 4.5m.

[0070] According to Step 4, according to the optimal central height of the vertical arrangement of the fin radiator, the fin radiator is arranged on the outer wall of the first floor of the offshore substation by wall-mounted installation method.

[0071] In this embodiment, by arranging the radiator on the outer wall of the first floor of the offshore substation, the bottom platform area of the offshore substation can be saved by about 60m 2 , and the bottom platform area is reduced by about 6%, solving the problem that the main transformer cooling device of the existing offshore substation occupies a large bottom platform area, and realizing the cost reduction and efficiency increase of offshore wind power development.

[0072] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The solutions in the embodiments of the present application can be implemented using various computer languages. For example, object-oriented programming languages such as Java and interpreted scripting languages such as JavaScript can be used.

[0073] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0074] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0075] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0076] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0077] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to cover these changes and modifications.

Claims

1. A vertical layout method for the main transformer cooling device of an offshore booster station, characterized in that, it includes the following steps: Step 1: According to the capacity and outer contour size of the main transformer of the offshore booster station, determine the unit box width B, unit box spacing d, and the number of unit boxes N of the fin radiator of the main transformer cooling device; Step 2: Establish a geometric model of the vertical layout of the transformer-radiator. Analyze through Fluent software to obtain the curve of the change relationship between the transformer temperature and the center height of the fin radiator: According to the unit box width B, unit box spacing d, and the number of unit boxes N of the fin radiator, establish a simplified two-dimensional model of the transformer and the fin radiator in AutoCAD software; then, import the simplified two-dimensional model into Gambit software for boundary type designation and pre-processing of mesh generation; then, transfer the mesh model established in Gambit into Fluent software to simulate the temperature field distribution inside the transformer and the radiator; finally, change the center height of the fin radiator, repeat the above steps, obtain the data of the change law of the transformer temperature with the center height of the fin radiator, and draw the curve of the change relationship between the transformer temperature and the center height of the fin radiator; Step 3: Use the numerical fitting method to obtain the analytical expression of the function of the main transformer temperature and the radiator height, and determine the optimal center height of the vertical layout of the fin radiator; Step 4: According to the optimal center height of the vertical layout of the fin radiator, use the wall-mounted installation method to arrange the fin radiator on the outer wall of the first floor of the offshore booster station.

2. The vertical layout method for the main transformer cooling device of an offshore booster station according to claim 1, characterized in that: In the first step, based on the width expansion length B of the flat radiator unit box 0 and the height H of the unit box, according to the capacity and outer contour dimensions of the main transformer, determine the width B of the flat radiator unit box and the unit box spacing d according to the optional dimension specifications. According to the heat generation Q of the transformer 变 and the heat dissipation Q of the flat radiator 散 calculate the number N of flat radiator unit boxes.

3. The vertical layout method for the main transformer cooling device of an offshore booster station according to claim 2, characterized in that: The number of unit boxes N of the fin radiator is calculated according to the following formula: Convective heat dissipation area of the chip radiator: S D = 2 × B 0 × H × N × 10 -6 (m 2 ) Radiating heat dissipation area of the chip radiator: S F =(2×B×d×N + B×H)×10 -6 (m 2 ) Surface coefficient of the self-cooling radiator of the chip radiator: β = (55S D + 45S F ) / 100S D ; Effective heat dissipation area of the chip radiator: S 散 = μ × k × β × S D (m 2 ) Among them, B 0 is the width-expanded length of the flat radiator unit box, in mm; B is the width of the flat radiator unit box, in mm; H is the height of the flat radiator unit box, in mm; N is the number of flat radiator unit boxes; d is the distance between flat radiator unit boxes, in mm; μ is the structure coefficient, i.e., the correction coefficient for the distance between flat radiator unit boxes; k is the correction coefficient for the number of flat radiator unit boxes; The number of unit boxes N of the fin radiator is calculated according to the following formula: Among them, represents the mathematical representation of rounding up; Q 变 is the heat generation of the transformer, Q 变 = Q 空载 + Q 负载 , Q 空载 is the load loss of the main transformer, Q 负载 is the no-load loss of the main transformer; Q 散 is the heat dissipation of the fin radiator, Q 散 = 2×h×S 散 (T s - T 0 ), where T s is the heat source temperature; T 0 is the ambient air temperature; h is the convective heat transfer coefficient, H is the height of the fin radiator unit box.

4. The vertical layout method for the main transformer cooling device of an offshore booster station according to any one of claims 1-3, characterized in that: In the said step 3, clarify the numerical fitting boundary, that is, the number of polynomial terms and the fitting error, and use the least squares method to perform polynomial fitting on the above relationship curve to obtain the analytical expression of the function of the main transformer temperature and the radiator center height: Among them, T 变 is the transformer temperature; x is the central height of the chip radiator; m is the number of specified polynomial terms; a n is the polynomial coefficient; Based on the above formula, the lowest temperature of the main transformer is set as the optimization objective to solve the optimal central height h of the vertical arrangement of the flat-plate radiator opt ; min T 变 s.t.h min ≤x≤h max where h min and h max are the minimum and maximum values of the center height of the chip radiator, respectively.

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