A layout method of prefabricated cabin-type offshore booster station based on cable differentiation

Abstract

The present invention provides a layout method of a prefabricated cabin-type offshore substation based on cable differentiation. Based on the cable connection relationship and cable model of each prefabricated cabin, the cable laying method and channel size are differentiated, which can effectively reduce the platform cable room and cable interlayer area, improve the utilization rate of the bottom cable layer platform of the offshore substation, and reduce the cable laying length. The present invention effectively reduces the inter-layer height of the offshore substation platform. On the one hand, it can reduce the steel used in the upper block steel structure of the offshore substation and reduce the construction cost; on the other hand, it can reduce the center of gravity of the offshore substation platform and improve the structural stability of the platform. It has broad application prospects on offshore floating platforms in the deep sea; in addition, the top of the prefabricated cabin is used as a cable maintenance channel, and the cable channel is provided with an operation and maintenance cover. People can go up to the top of the prefabricated cabin for inspection and maintenance, which further improves the space utilization rate of the offshore substation platform.

Description

Technical Field

[0001] The invention belongs to the technical field of new energy and relates to a method for arranging a prefabricated cabin-type offshore booster station. Background Art

[0002] At present, offshore substations mainly use cable mezzanines and cable bridges to lay platform cables, which include power cables, control cables, optical cables, etc. With the increase in the capacity of wind turbines and the expansion of offshore wind farms, the number of medium and high voltage cables in offshore substations is large and the cross-section is large, so offshore substation cables require larger laying channels; the increase in the size of cable mezzanines and cable bridges will increase the platform area and platform interlayer height of offshore substations.

[0003] Equipment prefabricated cabin technology has certain experience in application in domestic power engineering due to its high flexibility, short construction period and low construction cost. Prefabricated cabin-type booster stations have been widely used on land, and prefabricated cabin-type offshore booster stations have also become a new trend in the development of offshore wind power technology in recent years. Prefabricated cabin-type offshore booster stations can adopt a double-layer design of cable layer and platform layer to achieve the connection between each independent prefabricated cabin. However, due to the different heights of prefabricated cabins of different equipment, the turning radius and laying space requirements of different cables are also different. The prefabricated cabin-type offshore booster station obtained by the current platform cable laying channel and prefabricated cabin layout method has a large platform layer height and low platform space utilization of the offshore booster station. Summary of the invention

[0004] In order to solve the problems of large platform height and low platform space utilization of the prefabricated cabin-type offshore booster station described in the background technology, the present invention provides a layout method of a prefabricated cabin-type offshore booster station based on cable differentiation.

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

[0006] Step 1: Determine the size of the prefabricated cabin modules for each function of the platform based on the dimensions, safety distance, operation and maintenance space factors of each electrical equipment cabin and the functions of other auxiliary cabins;

[0007] Step 2: According to the power, control and communication function requirements of electrical equipment and other auxiliary compartments, clarify the cable connection relationship and model between the functional prefabricated compartments of the platform;

[0008] Step 3: Calculate the turning radius required for cable laying based on the cable connection relationship and model, and clarify the cable laying method and channel size based on the cable connection relationship of each cabin;

[0009] Step 4: Based on the module size of each functional prefabricated cabin on the platform, the cable laying method and the channel size, and taking minimizing the platform height as the optimization goal, the layout of each functional prefabricated cabin on the platform and the path plan for each cable laying channel are obtained, and the prefabricated cabin-type offshore substation is arranged.

[0010] Furthermore, in step one, the electrical equipment compartments include the main transformer room, GIS room, medium-voltage switchgear room, grounding transformer room, station transformer room, station distribution panel room, emergency distribution panel room, battery room, secondary panel room, diesel generator room, and fire protection room; other auxiliary compartments include living compartments, spare parts compartments, and sewage treatment compartments.

[0011] Furthermore, in step 2, the cables include high-voltage power cables of 66kV and above, medium-voltage power cables of 6-35kV, and low-voltage power cables of 3kV and below. The power cables are selected according to the electric energy transmitted and distributed in the loop between electrical equipment, and the stability is checked. The control cables and optical cables are selected according to the control and communication requirements of the electrical equipment.

[0012] Furthermore, in the step three, based on the cable connection relationship and model, and in accordance with the turning radius requirements for different cables and optical cables according to each cable model and specification, the laying and operation turning radius of each power cable, control cable, and optical cable is calculated; based on the cable connection relationship in each cabin, combined with the minimum inter-layer distance requirements of the cable rack, ladder rack or tray, the width, number of layers and inter-layer spacing of the ladder rack or bracket for laying each cable and optical cable tray are determined, and the dimensions of each laying channel are counted.

[0013] Furthermore, in step 4, by matching the high cabin with the small cable channel and the low cabin with the large cable channel, the height of each floor of the platform is minimized, that is, the height H of each functional prefabricated cabin is matched. ij And the height LH of the cable laying channels including electrical cables and optical cables in , so that on the same platform, H ij +LH in The value of reaches the minimum value; among them, H ij represents the height of each functional prefabricated cabin, i represents the platform layer where the prefabricated cabin is located, i=0, 1, 2, j represents the number of the prefabricated cabin on the i-th platform; LH in Indicates the height of each cable laying channel, LH in That is, the height of the nth type of cable laying channel above the i-th platform.

[0014] Furthermore, in the step 4, space is reserved on the top of each functional prefabricated cabin and below the cable laying channel as a cable maintenance channel, and an operation and maintenance cover is set on the cable laying channel.

[0015] Compared with the prior art, the present invention makes differentiated designs for cable laying methods and channel sizes based on the cable connection relationship and cable models of each prefabricated cabin, which can effectively reduce the area of ​​the platform cable room and cable mezzanine, improve the utilization rate of the bottom cable layer platform of the offshore substation, and reduce the cable laying length; through the matching design of differentiated cable laying channels and prefabricated cabins, the inter-layer height of the offshore substation platform can be effectively reduced. On the one hand, the steel used in the upper block steel structure of the offshore substation can be reduced, thereby reducing the construction cost; on the other hand, the center of gravity of the offshore substation platform can be reduced, and the stability of the platform structure can be improved, which has broad application prospects in offshore floating platforms in the deep sea; in addition, the top of the prefabricated cabin is used as a cable maintenance channel, and an operation and maintenance cover is set on the cable channel. People can go up to the top of the prefabricated cabin for inspection and maintenance, thereby further improving the space utilization rate of the offshore substation platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a flow chart of the method of the present invention.

[0017] Figure 2 It is a structural diagram of the prefabricated cabin-type offshore booster station of the present invention. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with 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.

[0019] A layout method of a prefabricated cabin-type offshore booster station based on cable differentiation, the flow chart is as follows Figure 1 As shown, the details are as follows.

[0020] Step 1: Determine the size of the prefabricated cabin modules for each function of the platform based on the external dimensions, safety distance, operation and maintenance space factors of each electrical equipment compartment and the functions of other auxiliary compartments.

[0021] Specifically, the electrical equipment compartments include the main transformer room, GIS room, medium-voltage switchgear room, grounding transformer room, station transformer room, station distribution panel room, emergency distribution panel room, battery room, secondary panel room, diesel generator room, and fire protection room; other auxiliary compartments include living compartment, spare parts compartment, and sewage treatment compartment.

[0022] According to the equipment dimensions provided by the equipment manufacturer and the requirements for safety distance and operation and maintenance space in the relevant standards and specifications of NB / T 31115-2017 "Design Specifications for 110kV~220kV Offshore Booster Substations for Wind Farm Projects (with Explanations of Clauses)", the length, width and height dimensions of the prefabricated cabins of various functions of the platform are designed, providing a design basis for the overall modular design of the prefabricated cabin-type offshore booster station.

[0023] Each prefabricated cabin height can be H ij Indicates, where i represents the platform layer where the prefabricated cabin is located, i=0, 1, 2; j represents the number of the prefabricated cabin on the i-th platform.

[0024] Step 2: According to the power, control and communication function requirements of electrical equipment and other auxiliary compartments, clarify the cable connection relationship and model between the functional prefabricated compartments of the platform.

[0025] Specifically, the cables include high-voltage power cables of 66kV and above, medium-voltage power cables of 6-35kV, and low-voltage power cables of 3kV and below. The power cables are selected based on the electric energy transmitted and distributed between the electrical equipment, and the stability is checked. The control cables and optical cables are selected based on the control and communication requirements of the electrical equipment.

[0026] Step 3: Based on the cable connection relationship and model, calculate the turning radius required for cable laying. Combined with the cable connection relationship of each cabin, clarify the cable laying method and channel size.

[0027] Specifically, based on the cable connection relationship and model, and in accordance with the turning radius requirements for different cables and optical cables in each cable model and specification, the laying and operation turning radius of each power cable, control cable, and optical cable is calculated; based on the cable connection relationship in each cabin, combined with the minimum inter-layer distance requirements of cable racks, ladders or trays, the width, number of layers and inter-layer spacing of the ladders or brackets for laying each cable and optical cable tray are determined, and the dimensions of each laying channel are counted.

[0028] According to the specification requirements, the turning radius requirements for different cables are shown in Table 1, Table 2 and Table 3.

[0029] Table 1 Minimum bending radius during laying and operation of power cables

[0030]

[0031] Table 2 Minimum bending radius of control cables

[0032]

[0033] Table 3 Minimum bending radius during cable laying and operation

[0034]

[0035] According to the minimum inter-layer distance requirements of cable racks, ladder racks or trays in the specifications, as shown in Table 4, determine the width, number of layers and inter-layer distance of the ladder rack or tray.

[0036] Table 4 Minimum distance between layers of cable racks, ladders or trays (mm)

[0037]

[0038]

[0039] Note: h is the height of the trough box shell.

[0040] If the laying channel height of each cable can be LH in Indicates that LH in That is, the height of the nth type of cable laying channel above the i-th platform.

[0041] Step 4: Based on the module size of each functional prefabricated cabin on the platform, the cable laying method and the channel size, and taking minimizing the platform height as the optimization goal, the layout of each functional prefabricated cabin on the platform and the path plan for each cable laying channel are obtained, and the prefabricated cabin-type offshore substation is arranged.

[0042] Specifically, by matching high cabins with small cable channels and low cabins with large cable channels, the height of each floor of the platform is minimized, that is, matching the height H of each functional prefabricated cabin. ij And the height LH of the cable and optical cable laying channel in , so that on the same platform, H ij +LH in The value of should be as small as possible, which can improve the utilization of platform space and reduce the height between each platform layer.

[0043] In addition, space is reserved on the top of each functional prefabricated cabin and below the cable laying channel as a cable maintenance channel, and an operation and maintenance cover is set on the cable laying channel. This allows people to go up to the top of the prefabricated cabin for inspection and maintenance, further improving the space utilization rate of the offshore booster station platform.

[0044] Example

[0045] The following is a detailed explanation of the offshore substation solution with two 300MVA main transformers as an example.

[0046] According to step one, the main transformer compartment is about 8.7m high, the 220kV GIS compartment is about 4.5m high, the 66kV distribution compartment is about 4.2m high, the sewage treatment compartment and water tank are about 2m high, and the remaining functional compartments are about 3.4m high.

[0047] According to step 2, 220kV cable selects 3×1000mm 2 Cross-section submarine cable, its outer diameter is about 265mm, the turning radius is 3975mm; 66kV cable chooses 3×400mm 2 The outer diameter of the cross-section submarine cable is about 163mm, and the turning radius is 2445mm; the turning radius of the low-voltage cable, control cable and optical cable is roughly 60-600mm.

[0048] According to step three, it is clear that the height of the 220kV cable laying channel is 4m, the height of the 66kV cable laying channel is 2.5m, and the height of the low-voltage cable, control cable and optical cable laying channel is 0.8m.

[0049] According to step four, choose to arrange the sewage treatment cabin and water tank under the 220kV cable laying channel, the living cabin and spare parts cabin under the 66kV cable laying channel, the oil tank and fire pump cabin under the low-voltage cable, control cable and optical cable laying channel, and reserve a height of 0.5m between the top of the prefabricated cabin and the cable laying channel as a maintenance channel.

[0050] Under the above arrangement, the bottom platform of the offshore booster station has a height of 6.5m, the first-floor platform has a height of 5.3m, and the second-floor platform has a height of 3.4m.

[0051] Compared with the conventional arrangement scheme, the embodiments of the present invention have achieved the following beneficial effects: 1) the area of ​​the platform cable room and cable mezzanine is effectively reduced by about 5%, and the cable laying length is reduced; 2) the total height of the offshore substation is expected to be reduced by 3m, a reduction of about 15%, reducing the steel used in the steel structure of the upper assembly of the offshore substation, reducing the construction cost, and lowering the center of gravity of the offshore substation platform, improving the stability of the platform structure; 3) the top of the prefabricated cabin is used as a cable maintenance channel to further improve the space utilization rate of the offshore substation platform.

[0052] Those skilled in the art will appreciate that, although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0053] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for arranging a prefabricated cabin-type offshore booster station based on cable differentiation, characterized in that: The following steps are involved: Step 1: Determine the size of the prefabricated cabin modules for each function of the platform based on the dimensions, safety distance, operation and maintenance space factors of each electrical equipment cabin and the functions of other auxiliary cabins; Step 2: According to the power, control and communication function requirements of electrical equipment and other auxiliary compartments, clarify the cable connection relationship and model between the functional prefabricated compartments of the platform; Step 3: Calculate the turning radius required for cable laying based on the cable connection relationship and model, and clarify the cable laying method and channel size based on the cable connection relationship of each cabin; Step 4: Based on the module size of each functional prefabricated cabin on the platform, the cable laying method and the channel size, and taking minimizing the platform height as the optimization goal, the layout of each functional prefabricated cabin on the platform and the path plan for each cable laying channel are obtained, and the prefabricated cabin-type offshore substation is arranged.

2. According to the method for arranging a prefabricated cabin-type offshore booster station based on cable differentiation according to claim 1, it is characterized by: In the step 1, the electrical equipment compartments include the main transformer room, GIS room, medium-voltage switchgear room, grounding transformer room, station transformer room, station distribution panel room, emergency distribution panel room, battery room, secondary panel room, diesel generator room, and fire fighting room; other auxiliary compartments include living compartments, spare parts compartments, and sewage treatment compartments.

3. The method for arranging a prefabricated cabin-type offshore booster station based on cable differentiation according to claim 2 is characterized in that: In step 2, the cables include high-voltage power cables of 66kV and above, medium-voltage power cables of 6-35kV, and low-voltage power cables of 3kV and below. The power cables are selected according to the electric energy transmitted and distributed between the electrical equipment loops, and stability checks are performed. Control cables and optical cables are selected according to the control and communication requirements of the electrical equipment.

4. A method for arranging a prefabricated cabin-type offshore booster station based on cable differentiation according to any one of claims 1 to 3, characterized in that: In the step three, based on the cable connection relationship and model, according to the turning radius requirements of different cables and optical cables for each cable model and specification, the laying and operation turning radius of each power cable, control cable, and optical cable is calculated; according to the cable connection relationship of each cabin, combined with the minimum inter-layer distance requirements of cable racks, ladder racks or trays, the width, number of layers and inter-layer spacing of the ladder racks or brackets for laying each cable and optical cable tray are determined, and the dimensions of each laying channel are counted.

5. The method for arranging a prefabricated cabin-type offshore booster station based on cable differentiation according to claim 4 is characterized in that: In step 4, by matching the high cabin with the small cable channel and the low cabin with the large cable channel, the height of each floor of the platform is minimized, that is, the height H of each functional prefabricated cabin is matched. ij And the height LH of the cable laying channels including electrical cables and optical cables in , so that on the same platform, H ij +LH in The value of reaches the minimum value; Among them, H ij represents the height of each functional prefabricated cabin, i represents the platform layer where the prefabricated cabin is located, i=0, 1, 2, j represents the number of the prefabricated cabin on the i-th platform; LH in Indicates the height of each cable laying channel, LH in That is, the height of the nth type of cable laying channel above the i-th platform.

6. The method for arranging a prefabricated cabin-type offshore booster station based on cable differentiation according to claim 5 is characterized in that: In the step 4, space is reserved on the top of each functional prefabricated cabin and below the cable laying channel as a cable maintenance channel, and an operation and maintenance cover is set on the cable laying channel.

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