Cost sensitivity analysis method and system for offshore wind power flexible direct current transmission cable

Abstract

The invention provides a cost sensitivity analysis method and system for an offshore wind power flexible direct current sending-out cable, and the method comprises the following steps: obtaining the rated capacity of direct current sending-out cables of different types, wherein the types of the direct current sending-out cables are related to the voltage class and the cross section area; calculating the total cost of the direct current transmission cables of different types; carrying out equal-capacity conversion on the cost based on the total cost and the rated capacity so as to obtain the cost difference of the direct-current transmission cables of different types; and performing sequential arrangement based on the cost difference, and performing cost sensitivity analysis based on the arranged cost sequence in combination with different types of direct current transmission cables. According to the cost sensitivity analysis method and system for the offshore wind power flexible direct-current sending-out cable, the cost of the direct-current sending-out cable is efficiently and accurately adjusted according to the sequence of the cost differences of different types of direct-current cables from low to high, and a reference basis is provided for economic planning and design of an offshore wind power flexible direct-current system.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore wind power and data processing, and in particular relates to a cost sensitivity analysis method and system for an offshore wind power flexible direct current transmission cable. Background Art

[0002] At present, the flexible DC system for offshore wind power is the preferred technical solution for large-scale, long-distance offshore wind power transmission and grid connection. Compared with conventional high-voltage AC transmission technology, the flexible DC transmission technology uses DC transmission cables, which can avoid the problem of limited transmission distance caused by excessive reactive charging current and severe overvoltage of long-distance AC transmission cables. Flexible DC transmission technology is free from the problem of phase-change failure, has independent active and reactive power regulation capabilities, and the system operation mode is flexible and controllable, and the grid-connected voltage is stable and reliable. It can effectively isolate the interaction between offshore wind farms and onshore AC power grids. It is currently the only large-scale offshore wind power grid connection solution with engineering practice experience.

[0003] In the existing market, the unit construction cost of DC transmission cables is relatively high, and the route length required for DC transmission cables for large-scale and long-distance offshore wind power is relatively long. Therefore, DC transmission cables usually account for a large proportion of the total construction cost of the entire offshore wind power flexible DC system. On the other hand, the construction costs of DC transmission cables of different voltage levels and cross-sectional areas are also significantly different. Therefore, the selection of DC transmission cables is an important factor affecting their total construction cost, and the selection needs to be analyzed in specific applications. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a cost sensitivity analysis method and system for an offshore wind power flexible DC transmission cable, so as to solve the problem of selection analysis of the above-mentioned DC transmission cable.

[0005] In a first aspect, the present invention provides a cost sensitivity analysis method for an offshore wind power flexible DC transmission cable, the method comprising the following steps:

[0006] Obtaining rated capacities of different types of DC transmission cables, wherein the type of the DC transmission cable is related to the voltage level and the cross-sectional area;

[0007] Calculate the total cost of the DC transmission cables of different types, wherein the total cost is related to the cable body cost, laying cost, discounted power loss during the operation period, and cable sea area use fee;

[0008] Based on the total cost and the rated capacity, equal capacity conversion cost is performed to obtain the cost difference of the DC transmission cables of different selections;

[0009] The cost differences are arranged in sequence, and a cost sensitivity analysis is performed based on the arranged cost sequence in combination with different selected types of the DC transmission cables.

[0010] In a possible implementation of the present application, obtaining the rated capacity of different selected DC transmission cables specifically includes:

[0011] Obtaining the type of the current DC transmission cable;

[0012] Extracting the voltage level and the cross-sectional area of ​​the corresponding type based on different selections;

[0013] The rated capacity of the DC transmission cable corresponding to the currently selected type is calculated based on the voltage level and the cross-sectional area of ​​any selected type.

[0014] In a possible implementation of the present application, the calculating the total cost of the DC transmission cables of different types specifically includes:

[0015] Calculating the cable body cost of the DC transmission cable based on the cable body unit price fed back by the supplier;

[0016] Calculating the laying cost of the DC transmission cable based on the laying unit price fed back by the construction party;

[0017] The discounted power loss during the operation period and the cable sea area usage fee are calculated based on the input parameters;

[0018] The total cost is obtained by cumulatively calculating the cost of the cable body, the laying cost, the discounted power loss during the operation period, and the cable sea area usage fee.

[0019] In a possible implementation of the present application, the calculation based on the input parameters to obtain the discounted power loss during the operation period specifically includes:

[0020] Obtaining the input parameters, wherein the input parameters include at least the number of cables, the current carrying capacity of cables, the DC resistance of cables, the length of cable routes, the annual utilization hours, and the power loss coefficient;

[0021] The active power loss of the DC cable is calculated based on the number of cables, the current carrying capacity of the cables, the DC resistance of the cables, and the route length of the cables;

[0022] Obtaining loss hours based on the annual utilization hours;

[0023] Calculate the annual power loss of the cable based on the power loss coefficient, the active power loss of the cable and the loss hours;

[0024] The discounted power loss during the operation period is calculated based on the annual power loss of the cable combined with the unit electricity price and the annual power loss coefficient during the operation period.

[0025] In a possible implementation of the present application, the cable sea area usage fee is calculated based on the input parameters, specifically including:

[0026] Acquire the input parameters, wherein the input parameters also include sea expropriation fees for cable routes during the operation period;

[0027] Calculate the converted years of the operation period based on the sea expropriation costs for the cable route during the operation period;

[0028] The sea area for the cable route is calculated based on the cable route length;

[0029] The cable sea area usage fee is calculated based on the sea area requisitioned for the cable route and the converted number of years of the operation period.

[0030] In a possible implementation of the present application, the cost conversion based on the total cost and the rated capacity to obtain the cost difference of the DC transmission cables of different types specifically includes:

[0031] Get the base cable rated capacity;

[0032] The equal capacity conversion cost is calculated by combining the total cost, the rated capacity and the rated capacity of the reference cable using a preset conversion formula;

[0033] The cost difference between the DC transmission cables of different selections and the DC transmission cables of the reference selection is calculated based on the equal capacity conversion cost.

[0034] In a possible implementation of the present application, the cost difference is arranged in sequence, and a cost sensitivity analysis is performed based on the arranged cost sequence in combination with the DC transmission cables of different types, specifically including:

[0035] Arranging the cost difference in ascending order to obtain the cost sequence, wherein the order of the cost sequence corresponds to the order of cost sensitivity;

[0036] Cost adjustments with different sensitivity levels are performed based on the order of the cost sequence, wherein the adjustment range is inversely proportional to the order of the cost sequence.

[0037] In a second aspect, the present invention provides a cost sensitivity analysis system for an offshore wind power flexible DC transmission cable, the system comprising:

[0038] A capacity calculation module, used to obtain the rated capacity of different types of DC transmission cables, wherein the type of the DC transmission cable is related to the voltage level and the cross-sectional area;

[0039] A cost calculation module, used to calculate the total cost of the DC transmission cables of different types, wherein the total cost is related to the cable body cost, laying cost, power loss discount during the operation period, and cable sea area use fee;

[0040] A conversion module, used for performing equal capacity conversion cost based on the total cost and the rated capacity to obtain the cost difference of the DC transmission cables of different types;

[0041] The analysis module is used to perform a sequence arrangement based on the cost difference, and perform a cost sensitivity analysis based on the arranged cost sequence in combination with the DC transmission cables of different types.

[0042] In a third aspect, the present invention provides an electronic device, the electronic device comprising: a processor and a memory;

[0043] The memory is used to store computer programs;

[0044] The processor is used to execute the computer program stored in the memory so that the electronic device executes the above-mentioned cost sensitivity analysis method of the offshore wind power flexible DC transmission cable.

[0045] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by an electronic device, implements the above-mentioned cost sensitivity analysis method for the offshore wind power flexible DC transmission cable.

[0046] As described above, the cost sensitivity analysis method and system of the offshore wind power flexible DC transmission cable described in the present invention have the following beneficial effects: by sorting the cost differences of different selected DC cables from low to high, sorting out and summarizing the sensitivity of the main parameters of the DC cable to the cost, achieving efficient and accurate adjustment of the cost of the DC transmission cable, and providing a reference basis for the economic planning and design of the offshore wind power flexible DC system. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Shown is a schematic diagram of a scene of an electronic device in an embodiment of the present invention;

[0048] Figure 2 It shows a schematic diagram of the topological structure of the offshore wind power flexible DC transmission system;

[0049] Figure 3 A method step diagram showing a cost sensitivity analysis method for an offshore wind power flexible DC transmission cable according to an embodiment of the present invention;

[0050] Figure 4 A method step diagram showing a cost sensitivity analysis method for an offshore wind power flexible DC transmission cable according to an embodiment of the present invention;

[0051] Figure 5 A method step diagram showing a cost sensitivity analysis method for an offshore wind power flexible DC transmission cable according to an embodiment of the present invention;

[0052] Figure 6 Shown is a schematic structural diagram of a cost sensitivity analysis system for an offshore wind power flexible DC transmission cable according to an embodiment of the present invention;

[0053] Figure 7 It is a schematic structural diagram of an electronic device of the present invention in one embodiment. DETAILED DESCRIPTION

[0054] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0055] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0056] The following embodiments of the present invention provide a cost sensitivity analysis method for offshore wind power flexible DC transmission cables, which can be applied to Figure 1 The electronic device shown. The electronic device described in the present invention may include a mobile phone 11 with a wireless charging function, a tablet computer 12, a laptop computer 13, a wearable device, a vehicle-mounted device, an augmented reality (AR) / virtual reality (VR) device, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), etc. The embodiment of the present invention does not impose any restrictions on the specific type of the electronic device.

[0057] For example, the electronic device may be a station (STAION, ST) in a WLAN with a wireless charging function, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA) device, a handheld device with a wireless charging function, a computing device or other processing device, a computer, a laptop computer, a handheld communication device, a handheld computing device, and / or other devices for communicating on a wireless system and a next generation communication system, such as a mobile terminal in a 5G network, a mobile terminal in a future evolved Public Land Mobile Network (PLMN), or a mobile terminal in a future evolved Non-terrestrial Network (NTN).

[0058] Specifically, the offshore wind power flexible DC transmission system is mainly composed of offshore wind farms, collection systems, offshore converter stations, flexible DC transmission cables, onshore converter stations and land power grids. Its typical system topology is as follows: Figure 2 As shown. Among them, the DC transmission cable route starts from the offshore converter station, passes through the ocean along the way as a submarine cable, lands on the beach and turns into a land cable, and finally connects to the land converter station. Among them, the design path of the DC transmission cable needs to avoid sea channels, protection areas and other obstacles. Therefore, the route length of the cable is usually greater than the straight-line distance between the offshore converter station and the land converter station. The cable cost calculation needs to be based on the route length of the cable. The cable needs to be laid along a specific sea corridor and using a cable-laying ship. Therefore, cable laying requires not only a certain laying cost, but also a certain sea area and sea area use fees. The DC resistance of the cable will also generate a certain amount of power loss during operation, so it is also necessary to include the cable power loss during the operation period into the total cost after discount.

[0059] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0060] Specifically, see Figure 3 In one embodiment of the invention, the cost sensitivity analysis method of the offshore wind power flexible DC transmission cable of the present invention comprises the following steps:

[0061] Step S302, obtaining rated capacities of different types of DC transmission cables, wherein the type of the DC transmission cable is related to the voltage level and the cross-sectional area;

[0062] Step S304, calculating the total cost of the DC transmission cables of different types, wherein the total cost is related to the cable body cost, laying cost, discounted power loss during operation, and cable sea area use fee;

[0063] Step S306, performing equal capacity conversion cost based on the total cost and the rated capacity to obtain cost differences of the DC transmission cables of different types;

[0064] Step S308: arranging the cost differences in sequence, and performing cost sensitivity analysis on the arranged cost sequence in combination with the DC transmission cables of different types.

[0065] It should be noted that, in this embodiment, obtaining the rated capacity of DC transmission cables of different selections specifically includes: obtaining the current selection of the DC transmission cable; extracting the voltage level and the cross-sectional area of ​​the corresponding type based on different selections; and calculating the rated capacity of the DC transmission cable corresponding to the current selection based on the voltage level and the cross-sectional area of ​​any selection.

[0066] It should be noted that, in this embodiment, since the rated capacities that can be transmitted by DC transmission cables of different voltage levels and cross-sections are different, it is necessary to first obtain the current selection of the DC transmission cable, so that the voltage level and the cross-sectional area of ​​the corresponding type can be extracted based on different selections, and then the rated capacity of the DC transmission cable corresponding to the current selection can be calculated based on the voltage level and the cross-sectional area of ​​any selection.

[0067] Specifically, at present, multiple offshore wind power flexible DC system projects that have been put into operation or under construction at home and abroad mainly include voltage levels such as "±500kV", "±400kV" and "±320kV". Considering the rated transmission capacity of typical offshore wind power flexible DC systems in the range of "1000MW~2500MW", the DC cable cross-sections corresponding to the above different voltage levels include "1×1600mm 2 ”, “1×2000mm 2 ”, “1×2500mm 2 ”, “1×3000mm 2 ” and “1×3500mm 2 ", etc. The rated capacity of the offshore wind power flexible DC system corresponding to the DC cables of different typical voltage levels and cross-sections is shown in Table 1.

[0068] Table 1. Rated capacity of DC transmission cables with different voltage levels and cross-sections

[0069]

[0070] Further, in one embodiment of the invention, if Figure 4 As shown, the calculation of the total cost of the DC transmission cables of different types specifically includes the following steps:

[0071] Step S402, calculating the cable body cost of the DC transmission cable based on the cable body unit price fed back by the supplier;

[0072] Step S404, calculating the laying cost of the DC transmission cable based on the laying unit price fed back by the construction party;

[0073] Step S406, calculating the discounted power loss during the operation period and the cable sea area usage fee based on the input parameters;

[0074] Step S408, the total cost is obtained by cumulatively calculating the cost of the cable body, the laying cost, the discounted power loss during the operation period, and the cable sea area use fee.

[0075] It should be noted that, in this embodiment, the unit price of the cable body is generally determined by the market and the supplier. Therefore, the cable body cost of the DC transmission cable can be calculated based on the cable body unit price feedback from the supplier, and the laying unit price is usually determined by the construction party. Accordingly, the laying cost of the DC transmission cable can be calculated based on the laying unit price feedback from the construction party.

[0076] Further, calculating the discounted power loss during the operation period and the cable sea area usage fee based on the input parameters specifically includes calculating the discounted power loss during the operation period based on the input parameters, and calculating the cable sea area usage fee based on the input parameters, wherein calculating the discounted power loss during the operation period based on the input parameters specifically includes: obtaining the input parameters, the input parameters at least including the number of cables, the cable current carrying capacity, the cable DC resistance, the cable route length, the annual utilization hours and the power loss coefficient; calculating the active power loss of the DC cable based on the number of cables, the cable current carrying capacity, the cable DC resistance and the cable route length; obtaining the loss hours based on the annual utilization hours and looking up the relationship table between the maximum load utilization hours and the loss hours; calculating the annual cable power loss based on the power loss coefficient, the cable active power loss and the loss hours; calculating the discounted power loss during the operation period based on the annual cable power loss combined with the unit electricity price and the annual power loss coefficient converted during the operation period.

[0077] It should be noted that, in this embodiment, the formula for calculating the discounted power loss during the operation period is as follows:

[0078] Discounted power loss during operation period = annual cable power loss * unit electricity price * annual power loss coefficient during operation period;

[0079] The annual power loss calculation formula of the cable is as follows:

[0080] Annual power loss of cable = power loss coefficient * cable active power loss * loss hours / 10000;

[0081] The loss hours are calculated from the annual utilization hours, and the cable active power loss calculation formula is as follows:

[0082] Cable active power loss = number of cables * (cable current carrying capacity) 2 * Cable DC resistance * Cable routing length;

[0083] Among them, the calculation formula for the annual electricity loss coefficient during the operation period is as follows:

[0084]

[0085] In the formula, K loss is the annual electricity loss coefficient during the operation period, i is the year of the operation period, Y is the operation period (usually taken as "25" years), and a is the discounted rate of return during the operation period (its typical value is "0.08").

[0086] Specifically, the input parameters are first obtained, and the input parameters include at least the number of cables, cable current carrying capacity, cable DC resistance, cable route length, annual utilization hours and electricity loss coefficient. Furthermore, the cable active power loss is calculated based on the number of cables, cable current carrying capacity, cable DC resistance and cable route length in the input parameters, and then the annual cable electricity loss is calculated. Finally, the discounted electric energy loss in the operation period is calculated based on the annual cable electricity loss and the annual electricity loss function converted in the operation period.

[0087] Among them, the input parameters are closely related to the climate environment of the wind farm, the grid access policy and other factors, resulting in different input parameters of wind farms in different regions. In order to make the calculation results have a typical reference effect, the above wind farm input parameters are set as typical values. The relevant input parameter setting and value-taking principles include as follows: Taking the annual utilization hours of offshore wind power as "3000h" as an example, the power factor is considered as "1.0", and the relationship table between the maximum load utilization hours and the loss hours is found. The corresponding loss hours are taken as "1250h". Considering the eddy current loss and dielectric loss of the armor layer, the final power loss coefficient is calculated as "1.8" times, and each kilowatt-hour is considered as "0.4298" yuan. The operating period of the cable is usually 25 years, and the annual power loss coefficient converted from the operating period is taken as "10.6748".

[0088] And, the calculation of the cable sea area usage fee based on the input parameters specifically includes: obtaining the input parameters, the input parameters also including the sea requisition fee for the cable route during the operation period; calculating the converted years of the operation period based on the sea requisition fee for the cable route during the operation period; calculating the sea requisition area for the cable route based on the length of the cable route; and calculating the cable sea area usage fee based on the sea requisition area for the cable route combined with the converted years of the operation period.

[0089] It should be noted that, in this embodiment, the formula for calculating the cable sea area usage fee is as follows:

[0090] Cable sea area usage fee = cable route sea area * adjustment coefficient * number of years of operation period;

[0091] The calculation formula for the sea area required for the cable route is as follows:

[0092] Sea area for cable route = cable route length * cable laying spacing;

[0093] The calculation formula for the converted years of the operation period is as follows:

[0094]

[0095] Where Y cor is the converted years of the operation period, i is the year of the operation period, C is the sum of the operation period and the construction period (the construction period is taken as "3" years, so C is taken as "28" years), z is the discounted rate of return in the first "3" years of the operation period (the income in the first three years of the operation period is generally not considered, so z is usually taken as 0), and a is the discounted rate of return after three years of the operation period (its typical value is "0.08").

[0096] Among them, the adjustment coefficient of the cable sea area usage fee is determined by factors such as sea area demand and classification, sea area market price and local economic level. Here, the adjustment coefficient can be taken as a typical value - "0.7". When calculating the sea area for cable routes, the cable laying spacing is usually determined based on factors such as sea area depth, offshore distance, surrounding environment, and safety distance requirements from surrounding equipment, waterway protection areas, etc. Here, a typical value of "20" meters is taken.

[0097] Specifically, the sea area requisitioned for the cable route is calculated based on the cable route length in the input parameters, and then the cable sea area usage fee is calculated in combination with the sea area requisitioned for the cable route and the converted years of the operation period, wherein, by way of example, it is calculated at "7,000 yuan / year" per hectare, with a one-time calculation for the construction period and annual calculation for the "28" years of operation period, discounted to "11.4740" years.

[0098] Specifically, the total price of the DC cables with a voltage level of ±500kV, total laying price, discounted annual power loss and sea area use fee of the DC cables with different cross-sections are calculated. By accumulating the cost components of the above DC cables with different selections, the total cost of the DC cables with different selections is obtained, as shown in Tables 2 and 3.

[0099] Table 2. Cost and active power loss of ±500kV DC transmission cables with different cross-sections

[0100]

[0101] Table 3. Economic analysis of ±500kV DC transmission cables with different cross-sections

[0102]

[0103] Furthermore, the cost components such as the total price of the DC cables with a voltage level of "±400kV" of different cross-sections, the total laying price, the discounted annual power loss and the sea area use fee are calculated, and the total cost of the DC cables with different selections is obtained by accumulating the cost components of the above DC cables, as shown in Tables 4 and 5.

[0104] Table 4. Cost and active power loss of ±400kV DC transmission cables with different cross-sections

[0105]

[0106]

[0107] Table 5. Economic analysis of ±400kV DC transmission cables with different cross-sections

[0108]

[0109] Furthermore, the cost components such as the total price of the DC cables with a voltage level of ±320kV, the total laying price, the discounted annual power loss and the sea area use fee of the DC cables with different cross-sections are calculated, and the total cost of the DC cables with different selections is obtained by accumulating the cost components of the above DC cables, as shown in Tables 6 and 7 respectively.

[0110] Table 6. Cost and active power loss of ±320kV DC transmission cables with different cross-sections

[0111]

[0112] Table 7. Economic analysis of ±320kV DC transmission cables with different cross-sections

[0113]

[0114]

[0115] Further, in one embodiment of the invention, if Figure 5 As shown, the cost conversion based on the total cost and the rated capacity to obtain the cost difference of the DC transmission cables of different types specifically includes the following steps:

[0116] Step S502, obtaining the rated capacity of the reference cable;

[0117] Step S504, using a preset conversion formula to calculate the total cost, the rated capacity and the rated capacity of the reference cable to obtain an equal capacity conversion cost;

[0118] Step S506, calculating the cost difference between the DC transmission cables of different types and the DC transmission cables of reference type based on the equal capacity conversion cost.

[0119] It should be noted that, in this embodiment, the conversion formula is as follows:

[0120] Equal capacity conversion cost = total cost × rated capacity of reference cable / rated capacity;

[0121] Among them, the rated capacity of the benchmark cable is first obtained, and then the conversion cost is calculated based on the conversion formula to obtain the corresponding equal-capacity conversion cost. Specifically, a method for realizing equivalent conversion of the DC transmission cable cost is based on the cable rated capacity ratio, and the costs of DC transmission cables of different selections are uniformly converted to the cost of the same equivalent rated capacity. Furthermore, after obtaining the conversion equal-capacity cost, the cost difference between DC transmission cables of different selections and the benchmark selection DC transmission cable can be further calculated.

[0122] Specifically, according to the conversion formula and Table 1, the equal capacity conversion costs of different selected DC transmission cables are calculated respectively, and the results are shown in Table 8.

[0123] Table 8. Cost of equal capacity conversion of different selected DC transmission cables (ten thousand yuan)

[0124]

[0125] Then, the cost difference between different selected DC transmission cables and the reference selected DC transmission cables is further calculated, taking the “1×2500mm” of “±500kV” as an example. 2 The cost of the cable with a cross section of "213186.04" is used as the calculation basis, then the cost of the cable with a cross section of "±500kV" of "1×3000mm 2The cost difference of equal capacity conversion of cables with "section" is "210074.35 -213186.04 = -3111.69" million yuan. The cost difference of other selected equal capacity conversion cables can be calculated in the same way. Finally, the cost differences of different levels are marked in different colors for easy screening and comparison, as shown in Table 9.

[0126] Table 9. Cost difference of equal capacity conversion of different selected DC transmission cables with 2000MW as the base capacity (ten thousand yuan)

[0127]

[0128] Furthermore, in one embodiment of the invention, the cost difference is arranged in sequence, and a cost sensitivity analysis is performed based on the arranged cost sequence in combination with different selected DC transmission cables, specifically including: arranging the cost difference in ascending order to obtain the cost sequence, wherein the order of the cost sequence corresponds to the order of cost sensitivity; and adjusting the costs of different sensitivity levels based on the order of the cost sequence, wherein the adjustment range is inversely proportional to the order of the cost sequence.

[0129] It should be noted that, in this embodiment, since the ranking of the cost sequence corresponds to the ranking of the cost sensitivity, it can be arranged in ascending order based on the cost difference. Therefore, when the price is actually adjusted, cost adjustments of different sensitivity levels can be made based on the order of the cost sequence, wherein the adjustment range is inversely proportional to the ranking of the cost sequence.

[0130] Specifically, according to Table 9, the cost differences of different selected DC transmission cables are ranked from low to high, and the sensitivity of the main selection parameters of DC transmission cables to the cost is sorted out and summarized, as shown in Table 10.

[0131] Table 10. Cost sensitivity ranking of DC transmission cables of different voltage levels and cross-section selections

[0132]

[0133]

[0134] Among them, by controlling the parameters with higher sensitivity to adjust the cost significantly, and controlling the parameters with lower sensitivity to adjust the cost slightly, the cost of the DC transmission cable can be adjusted efficiently and accurately, providing a reference for the economic planning and design of offshore wind power flexible DC systems. It should be noted that in cable selection, in addition to considering cost factors, for ultra-large specifications such as "1×3000mm2" and "1×3500mm2", it is also necessary to consider many factors such as laying space, operation and maintenance difficulty and technology maturity.

[0135] An embodiment of the present application also provides a cost sensitivity analysis system for an offshore wind power flexible DC transmission cable. The cost sensitivity analysis system for an offshore wind power flexible DC transmission cable can implement the cost sensitivity analysis method for an offshore wind power flexible DC transmission cable described in the present application. However, the implementation device of the cost sensitivity analysis method for an offshore wind power flexible DC transmission cable described in the present application includes but is not limited to the structure of the cost sensitivity analysis system for an offshore wind power flexible DC transmission cable listed in the present embodiment. All structural deformations and replacements of the prior art made according to the principles of the present application are included in the protection scope of the present application.

[0136] See also Figure 6 In one embodiment, this embodiment provides a cost sensitivity analysis system 60 for an offshore wind power flexible DC transmission cable, the system comprising:

[0137] An acquisition module 61 is used to acquire an operation request from a user terminal, wherein the operation request includes a common operation request;

[0138] The request module 62 is used to perform a request operation based on the common use operation request combined with the edited target business model, wherein the request operation includes an import and export operation, wherein:

[0139] An import module 63 is used to load data according to the object list and reference relationship list of the current target business model based on the common use operation request when performing an import operation;

[0140] The export module 64 is used to select related objects from the target business model for export based on the common use operation request when performing an export operation.

[0141] Since the specific implementation of this embodiment corresponds to the aforementioned method embodiment, the same details will not be repeated here, and those skilled in the art should also understand that Figure 6 The division of the modules in the embodiment is merely a division of logical functions, and in actual implementation, all or part of them can be integrated into one or more physical entities, and these modules can be implemented entirely in the form of software called by processing elements, or entirely in the form of hardware, or some modules can be implemented in the form of software called by processing elements, and some modules can be implemented in the form of hardware.

[0142] In the several embodiments provided by the present invention, it should be understood that the disclosed system, device or method can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules / units is only a logical function division, and there may be other division methods in actual implementation, such as multiple modules or units can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules or units, which can be electrical, mechanical or other forms.

[0143] The modules / units described as separate components may or may not be physically separated, and the components displayed as modules / units may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules / units may be selected according to actual needs to achieve the purpose of the embodiments of the present invention. For example, the functional modules / units in the various embodiments of the present invention may be integrated into one processing module, or each module / unit may exist physically separately, or two or more modules / units may be integrated into one module / unit.

[0144] Those of ordinary skill in the art should further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0145] The embodiment of the present invention also provides a computer-readable storage medium. A person of ordinary skill in the art can understand that all or part of the steps in the method for implementing the above embodiment can be completed by instructing the processor through a program, and the program can be stored in a computer-readable storage medium, and the storage medium is a non-transitory medium, such as a random access memory, a read-only memory, a flash memory, a hard disk, a solid-state hard disk, a magnetic tape, a floppy disk, an optical disc, and any combination thereof. The above storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a digital video disc (DVD)), or a semiconductor medium (e.g., a solid-state disk (SSD)), etc.

[0146] An embodiment of the present invention further provides an electronic device, which includes a processor and a memory.

[0147] The memory is used to store computer programs.

[0148] The memory includes: ROM, RAM, disk, USB flash drive, memory card or CD and other media that can store program codes.

[0149] The processor is connected to the memory and is used to execute the computer program stored in the memory so that the electronic device executes the above-mentioned cost sensitivity analysis method of the offshore wind power flexible DC transmission cable.

[0150] Preferably, the processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0151] like Figure 7As shown, the electronic device of the present invention is in the form of a general computing device. The components of the electronic device may include but are not limited to: one or more processors or processing units 71, a memory 72, and a bus 73 connecting different system components (including the memory 72 and the processing unit 71).

[0152] Bus 73 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. By way of example, these architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0153] Electronic devices typically include a variety of computer system readable media. These media can be any available media that can be accessed by the electronic device, including volatile and non-volatile media, removable and non-removable media.

[0154] The memory 72 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 721 and / or cache memory 722. The electronic device may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 723 may be used to read and write non-removable, non-volatile magnetic media ( Figure 7 not shown, usually called a "hard drive"). Although Figure 7 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to the bus 73 via one or more data medium interfaces. The memory 72 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present invention.

[0155] A program / utility 724 having a set (at least one) of program modules 7241 may be stored, for example, in the memory 72, such program modules 7241 including but not limited to an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules 7241 generally perform the functions and / or methods of the embodiments described herein.

[0156] The electronic device may also communicate with one or more external devices (e.g., keyboards, pointing devices, displays, etc.), one or more devices that enable a user to interact with the electronic device, and / or any device that enables the electronic device to communicate with one or more other computing devices (e.g., network cards, modems, etc.). Such communication may be performed via input / output (I / O) interface 74. Furthermore, the electronic device may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via network adapter 75. Figure 7 As shown, the network adapter 75 communicates with other modules of the electronic device via the bus 73. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the electronic device, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0157] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A cost sensitivity analysis method for offshore wind power flexible DC transmission cable, characterized in that: include: Obtaining rated capacities of different types of DC transmission cables, wherein the type of the DC transmission cable is related to the voltage level and the cross-sectional area; Calculate the total cost of the DC transmission cables of different types, wherein the total cost is related to the cable body cost, laying cost, discounted power loss during the operation period, and cable sea area use fee; Based on the total cost and the rated capacity, equal capacity conversion cost is performed to obtain the cost difference of the DC transmission cables of different selections; The cost differences are arranged in sequence, and a cost sensitivity analysis is performed based on the arranged cost sequence in combination with different selected types of the DC transmission cables.

2. The cost sensitivity analysis method of the offshore wind power flexible DC transmission cable according to claim 1 is characterized in that: The step of obtaining the rated capacity of different selected DC transmission cables specifically includes: Obtaining the type of the current DC transmission cable; Extracting the voltage level and the cross-sectional area of ​​the corresponding type based on different selections; The rated capacity of the DC transmission cable corresponding to the currently selected type is calculated based on the voltage level and the cross-sectional area of ​​any selected type.

3. The cost sensitivity analysis method of the offshore wind power flexible DC transmission cable according to claim 2 is characterized in that: The calculating of the total cost of the DC transmission cables of different types specifically includes: Calculating the cable body cost of the DC transmission cable based on the cable body unit price fed back by the supplier; Calculating the laying cost of the DC transmission cable based on the laying unit price fed back by the construction party; The discounted power loss during the operation period and the cable sea area usage fee are calculated based on the input parameters; The total cost is obtained by cumulatively calculating the cost of the cable body, the laying cost, the discounted power loss during the operation period, and the cable sea area usage fee.

4. The cost sensitivity analysis method of the offshore wind power flexible DC transmission cable according to claim 3 is characterized in that: The calculation based on the input parameters to obtain the discounted power loss during the operation period specifically includes: Obtaining the input parameters, wherein the input parameters include at least the number of cables, the current carrying capacity of cables, the DC resistance of cables, the length of cable routes, the annual utilization hours, and the power loss coefficient; The active power loss of the DC cable is calculated based on the number of cables, the current carrying capacity of the cables, the DC resistance of the cables, and the route length of the cables; Obtaining loss hours based on the annual utilization hours; Calculate the annual power loss of the cable based on the power loss coefficient, the active power loss of the cable and the loss hours; The discounted power loss during the operation period is calculated based on the annual power loss of the cable combined with the unit electricity price and the annual power loss coefficient during the operation period.

5. The cost sensitivity analysis method of the offshore wind power flexible DC transmission cable according to claim 4 is characterized in that: The cable sea area usage fee is calculated based on the input parameters and specifically includes: Acquire the input parameters, wherein the input parameters also include sea expropriation fees for cable routes during the operation period; Calculate the converted years of the operation period based on the sea expropriation costs for the cable route during the operation period; The sea area for the cable route is calculated based on the cable route length; The cable sea area usage fee is calculated based on the sea area requisitioned for the cable route and the converted number of years of the operation period.

6. The cost sensitivity analysis method of the offshore wind power flexible DC transmission cable according to claim 5 is characterized in that: The cost difference of the DC transmission cables of different types obtained by converting the cost of equal capacity based on the total cost and the rated capacity specifically includes: Get the base cable rated capacity; The equal capacity conversion cost is calculated by combining the total cost, the rated capacity and the rated capacity of the reference cable using a preset conversion formula; The cost difference between the DC transmission cables of different selections and the DC transmission cables of the reference selection is calculated based on the equal capacity conversion cost.

7. The cost sensitivity analysis method of the offshore wind power flexible DC transmission cable according to claim 6 is characterized in that: The step of arranging the cost differences in sequence and performing cost sensitivity analysis based on the arranged cost sequence in combination with different selected types of the DC transmission cables specifically includes: Arranging the cost difference in ascending order to obtain the cost sequence, wherein the order of the cost sequence corresponds to the order of cost sensitivity; Cost adjustments with different sensitivity levels are performed based on the order of the cost sequence, wherein the adjustment range is inversely proportional to the order of the cost sequence.

8. A cost sensitivity analysis system for offshore wind power flexible DC transmission cables, characterized in that: include: A capacity calculation module, used to obtain the rated capacity of different types of DC transmission cables, wherein the type of the DC transmission cable is related to the voltage level and the cross-sectional area; A cost calculation module, used to calculate the total cost of the DC transmission cables of different types, wherein the total cost is related to the cable body cost, laying cost, power loss discount during the operation period, and cable sea area use fee; A conversion module, used for performing equal capacity conversion cost based on the total cost and the rated capacity to obtain the cost difference of the DC transmission cables of different types; The analysis module is used to perform a sequence arrangement based on the cost difference, and perform a cost sensitivity analysis based on the arranged cost sequence in combination with the DC transmission cables of different types.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, it implements the cost sensitivity analysis method of the offshore wind power flexible DC transmission cable as described in any one of claims 1 to 7.

10. An electronic device, characterized in that: The electronic device comprises: a processor and a memory; wherein the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the electronic device executes the cost sensitivity analysis method of the offshore wind power flexible DC transmission cable as described in any one of claims 1 to 7.

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