A method for selecting redundant configuration of offshore wind power main transformer and submarine cable cross section

Abstract

The invention discloses a method for selecting redundant configuration of offshore wind power main transformer and cross section of submarine cable, comprising obtaining initial data of offshore wind farm; performing LCC calculation of main transformer of offshore booster station according to the initial data, obtaining redundant configuration of main transformer and redundancy of main transformer; performing LCC calculation of sending submarine cable according to the redundancy of main transformer, obtaining cross section selection of submarine cable with optimal life cycle cost; judging whether cross section selection of submarine cable matches redundancy of main transformer, if not, performing correction step, if matching, performing output step; first obtaining cross section selection of different submarine cables and calculation results of current carrying capacity thereof according to initial data, and then calculating LCC calculation result matching redundant configuration of main transformer; outputting optimal redundant configuration of transformer and cross section selection of submarine cable, the invention can establish dynamic model of full life cycle cost of main transformer and sending submarine cable of offshore booster station, so as to achieve the effect of screening redundant configuration of main transformer and cross section of submarine cable.

Description

Technical Field

[0001] The invention relates to a method for redundant configuration of an offshore wind power main transformer and selection of a submarine cable cross section, belonging to the technical field of offshore wind power transmission and transformation. Background Art

[0002] Building a clean, low-carbon, safe and efficient energy system has become a key task in current energy work. Large-capacity offshore wind power grid connection and its transmission and transformation technology will play an important role in my country's energy transmission network in the future. In particular, China's coastal areas are rich in wind energy resources and close to load centers, so the electricity market is vast.

[0003] As the key parts of offshore wind power, the offshore substation and the submarine cable are of great significance for the accurate optimization of the redundant configuration of their power transmission system. Unlike onshore wind farms, the electrical equipment such as the main transformer and submarine cable in the offshore substation face the test of the special marine environment during the manufacturing, construction and operation and maintenance stages, resulting in a high failure rate. Although the redundant configuration of the main transformer and the submarine cable section can improve the operational reliability of the system, excessive redundancy will increase the investment burden. At present, in domestic and foreign research, the LCC calculation method for the redundant configuration of the main transformer mainly considers the configuration scheme of the equipment in the offshore substation, while the selection of the submarine cable section is mainly based on the calculation results of the offshore wind farm capacity. However, for the equipment selection of the entire offshore wind farm transmission and transformation part, the existing optimization configuration methods and theories are difficult to meet the requirements. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for redundant configuration of offshore wind power main transformers and selection of submarine cable cross-sections. By combining the full life cycle characteristics of the main transformer and the sending submarine cable, selection standards for the main transformer and the sending submarine cable suitable for offshore wind farms are formulated, and a full life cycle cost (LCC) model such as purchase cost, laying cost, and failure loss cost is constructed to achieve optimal equipment selection and cross-section selection while ensuring reliable transmission of electric energy.

[0005] To achieve the above object, the present invention is implemented by adopting the following technologies:

[0006] In a first aspect, the present invention provides a method for redundant configuration of an offshore wind power main transformer and selection of a submarine cable section, comprising:

[0007] Obtain initial data for offshore wind farms;

[0008] Calculate the LCC of the main transformer of the offshore booster station according to the initial data to obtain the main transformer redundancy configuration and main transformer redundancy for preliminary selection of the submarine cable section;

[0009] Calculate the LCC of the outgoing submarine cable according to the redundancy of the main transformer to obtain the submarine cable cross-section selection with the optimal life cycle cost;

[0010] Determine whether the submarine cable cross-section selection with the optimal life cycle cost matches the redundancy of the main transformer, if not, perform a correction step, and if matched, perform an output step;

[0011] Correction steps: First, obtain the selection of different submarine cable sections and their current carrying capacity calculation results based on the initial data, and then calculate the LCC calculation results that match the main transformer redundancy configuration;

[0012] Output step: Output the optimal transformer redundancy configuration and submarine cable section selection.

[0013] Furthermore, the initial data includes one or more of wind turbine modified power curve, utilization hours, grid-connected power, and submarine cable laying conditions.

[0014] Further, the LCC calculation of the main transformer of the offshore booster station is performed according to the initial data to obtain the main transformer redundancy configuration and the main transformer redundancy used for preliminary selection of the submarine cable section, including:

[0015] According to the pre-obtained transformer operation rules and key control point expenditures, the full life cycle cost C of the main transformer of the offshore substation is obtained. ZB , the formula is as follows:

[0016] C ZB =C i +C o +C m +C f +C d

[0017] Where: C i is the initial investment cost, including equipment purchase cost, installation and commissioning cost, etc.; C o is the operating cost, including equipment energy consumption, inspection and maintenance fees, etc.; C m is the maintenance cost, including planned maintenance fee, equipment rental fee and power outage loss, etc.; C f is the failure cost, including failure repair fee, power outage loss, etc.; C d The scrapping cost includes the decommissioning disposal fee and the residual value of the equipment;

[0018] Calculate C based on the pre-acquired general equipment cost and equipment installation and commissioning fee i ;

[0019] Operating cost o The formula is as follows:

[0020]

[0021] Where D is the on-grid electricity price of this project; P0 is the no-load loss of the main transformer; T0 is the annual operating hours of the main transformer; P k is the load loss; ρ is the transformer load rate; τ is the annual loss hours; m is the number of main transformers; i is the discount rate, which is generally obtained based on the lpr interest rate; n is the operating life;

[0022] Maintenance cost C m The formula is as follows:

[0023]

[0024] Among them, C xx The cost of a single minor repair of a single main transformer; C dx The cost of a single overhaul of a single main transformer; C zc is the ship rental fee; ΔE is the power outage loss cost for overhaul; Y m is the year of overhaul; j is the overhaul or failure in the jth year;

[0025] Failure cost C f The formula is as follows:

[0026]

[0027] Where W is the fault interruption power; T is the fault interruption time; λ is the annual average failure rate of the equipment; C RC is the average cost of repairing a fault; T XF is the mean time to repair;

[0028] Scrap cost C d The formula is as follows:

[0029] C d =-(0.3C i +0.3C ts )(1+i) -n

[0030] Among them, C ts Cost of commissioning the transformer;

[0031] According to the above calculation results, we have:

[0032] C ZB(min) =min(C ZB1 ,C ZB2 ,C ZB3 ,...,C ZBn )

[0033] According to the above formula, the optimal transformer redundancy configuration P is obtained. c , and the main transformer capacity S c .

[0034] Furthermore, the LCC of the outgoing submarine cable is calculated according to the redundancy of the main transformer to obtain the submarine cable section selection with the optimal life cycle cost, including:

[0035] The formula for obtaining the life cycle cost of the LCC model of the submarine cable is as follows:

[0036] C HL =C I +C F +C S +C H +C G +C Y +C H

[0037] Where: C I The purchase cost of the submarine cable; C F Cost of laying submarine cables; C S is the submarine cable operation loss cost; C H is the cost of sea area occupation; C G is the failure loss cost; C Y C is the operation and maintenance cost; H To recover the net investment cost;

[0038] The purchase cost of submarine cables C I The formula is as follows:

[0039] C I =NSP G

[0040] Where: N is the number of submarine cable loops; S is the length of the submarine cable route; P G The cost of purchasing submarine cable per unit length. The cost of laying submarine cable construction C F The formula is as follows:

[0041] C F =NSP F

[0042] Among them, P F is the cost of laying submarine cable per unit length;

[0043] Cost of sea area occupation C H The formula is as follows:

[0044]

[0045] Among them, D h The unit sea area occupation fee is RMB / hectare;

[0046] S0305: Submarine cable operation loss cost C S The formula is as follows:

[0047]

[0048] Among them, P S is the loss cost per unit length of submarine cable; τ is the loss hours obtained from the transmission capacity and the utilization hours; D is the on-grid electricity price during the operation period of the site;

[0049] Failure loss cost C G The formula is as follows:

[0050]

[0051] Among them, f G is the submarine cable fault frequency; P G Economic losses caused by power outage and emergency repair costs;

[0052] Operation and maintenance cost C Y The formula is as follows:

[0053]

[0054] Where P Y The annual operation and maintenance costs;

[0055] Recover net investment cost C H The formula is as follows:

[0056] C H =-0.05C I (1+i) -n

[0057] S0309: According to the above calculation results, we have:

[0058] C HL(min) =min(C HL1 ,C HL2 ,C HL3 ,...,C HLn )

[0059] According to the above formula, the optimal submarine cable cross-section selection can be obtained.

[0060] Further, judging whether the submarine cable cross-section selection with the best life cycle cost matches the redundancy of the main transformer includes:

[0061] According to the optimal submarine cable cross-section selection, the current carrying capacity is calculated in the mudflat, seabed, dike pipe, J-type pipe, and cable trench. The maximum transmission current is I T ,I H ,I D ,I J ,I G ;

[0062] According to the bottleneck section of the maximum transmission current, the transformer redundancy configuration matching the optimal submarine cable section selection is obtained. The matching transformer capacity formula is as follows:

[0063]

[0064] Determine whether P is consistent with the primary transformer redundancy configuration P obtained in the main transformer LCC cost calculation c Match; if P c =P, then execute the output step and output C HL(min) , C ZB(min) The optimal main transformer redundancy configuration and submarine cable selection are selected, otherwise the correction steps are performed.

[0065] Furthermore, the correction step is: according to the different submarine cable section selections calculated based on the initial data and the current carrying capacity calculation results thereof, the LCC calculation results matching the main transformer redundant configuration are obtained, and the formula is as follows: HL+ZB(min) =min(C HL+ZB1 ,C HL+ZB2 ,C HL+ZB3 ,...,C HL+ZBn ).

[0066] In a second aspect, the present invention provides an offshore wind power main transformer redundant configuration and submarine cable section selection device, comprising:

[0067] An acquisition unit, used for acquiring initial data of an offshore wind farm;

[0068] A main transformer LCC calculation unit is used to perform LCC calculation of the main transformer of the offshore booster station according to the initial data, and obtain the main transformer redundancy configuration and main transformer redundancy for preliminary selection of the submarine cable section;

[0069] The outgoing submarine cable LCC calculation unit is used to calculate the outgoing submarine cable LCC according to the main transformer redundancy to obtain the submarine cable cross-section selection with the optimal life cycle cost;

[0070] A judgment unit, used to judge whether the cross-section selection of the submarine cable with the optimal life cycle cost matches the redundancy of the main transformer, and if not, execute the correction unit; if so, execute the output unit;

[0071] The correction unit is used to first obtain the selection of different submarine cable sections and the calculation results of their current carrying capacity according to the initial data, and then calculate the LCC calculation results that match the redundant configuration of the main transformer;

[0072] The output unit is used to output the optimal transformer redundancy configuration and submarine cable section selection.

[0073] In a third aspect, the present invention provides an offshore wind power main transformer redundant configuration and submarine cable section selection device, including a processor and a storage medium;

[0074] The storage medium is used to store instructions;

[0075] The processor is configured to operate according to the instructions to execute the steps of any of the aforementioned methods.

[0076] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the aforementioned methods.

[0077] Compared with the prior art, the present invention has the following beneficial effects:

[0078] The present invention provides a method for redundant configuration of offshore wind power main transformers and selection of submarine cable sections. The method can first determine a preliminary submarine cable section scheme through LCC calculation of the main transformer equipment of the offshore booster station, and then determine the optimal submarine cable selection through LCC calculation of different sending submarine cable schemes. Finally, according to the laying conditions and operating parameters of the wind farm area, the current carrying capacity of the optimal submarine cable scheme in different laying stages is obtained to correct the redundant configuration of the main transformer, thereby realizing the optimized configuration of the transmission and transformation part of the entire offshore wind farm and achieving the optimal cost of the entire life cycle of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] Figure 1 4 is a main transformer LCC calculation diagram in an embodiment of the present invention.

[0080] Figure 2 It is a LCC calculation diagram of the sending submarine cable in an embodiment of the present invention.

[0081] Figure 3 It is a flow chart of the optimal main transformer redundant configuration and submarine cable selection determination method in an embodiment of the present invention. DETAILED DESCRIPTION

[0082] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technology of the present invention, and cannot be used to limit the protection scope of the present invention.

[0083] Example 1

[0084] This embodiment introduces a method for redundant configuration of offshore wind power main transformers and selection of submarine cable cross-sections, including:

[0085] Obtain initial data for offshore wind farms;

[0086] Calculate the LCC of the main transformer of the offshore booster station according to the initial data to obtain the main transformer redundancy configuration and main transformer redundancy for preliminary selection of the submarine cable section;

[0087] Calculate the LCC of the outgoing submarine cable according to the redundancy of the main transformer to obtain the submarine cable cross-section selection with the optimal life cycle cost;

[0088] Determine whether the submarine cable cross-section selection with the optimal life cycle cost matches the redundancy of the main transformer, if not, perform a correction step, and if matched, perform an output step;

[0089] Correction steps: First, obtain the selection of different submarine cable sections and their current carrying capacity calculation results based on the initial data, and then calculate the LCC calculation results that match the main transformer redundancy configuration;

[0090] Output step: Output the optimal transformer redundancy configuration and submarine cable section selection.

[0091] like Figure 3 As shown, the application process of the offshore wind power main transformer redundant configuration and submarine cable section selection method provided in this embodiment specifically involves the following steps:

[0092] S01: Obtain the initial parameters of the offshore wind farm, such as the wind turbine modified power curve, utilization hours, grid-connected power, and submarine cable laying conditions.

[0093] S02: Calculate the LCC of the main transformer of the offshore substation based on the initial data to determine the initial main transformer redundancy configuration P for the preliminary selection of the submarine cable section. c .

[0094] like Figure 1 As shown, the process should include the following:

[0095] S0201: Based on the operating rules of the transformer and the cost expenditure of key control points, the full life cycle cost C of the main transformer of the offshore substation ZB It can be written as:

[0096] C ZB =C i +C o +C m +C f +C d

[0097] Where: C i is the initial investment cost, including equipment purchase cost, installation and commissioning cost, etc.; C o is the operating cost, including equipment energy consumption, inspection and maintenance fees, etc.; C m is the maintenance cost, including planned maintenance fee, equipment rental fee and power outage loss, etc.; C f is the failure cost, including failure repair fee, power outage loss, etc.; C d It is the scrapping cost, including decommissioning disposal fees and equipment residual value.

[0098] S0202: Calculate C based on general equipment cost and equipment installation and commissioning fee i .

[0099] S0203: The main transformer operating cost mainly considers transformer copper loss, iron loss, and inspection and maintenance costs, so C o It can be written as:

[0100]

[0101] Where D is the on-grid electricity price of this project; P0 is the no-load loss of the main transformer; T0 is the annual operating hours of the main transformer; P k is the load loss; ρ is the transformer load rate; τ is the annual loss hours; m is the number of main transformers; i is the discount rate, which is generally obtained based on the LPR interest rate; n is the operating life, which is generally 25 years for offshore wind power projects.

[0102] S0204: The maintenance cost of the main transformer mainly includes the planned major and minor maintenance costs, equipment rental fees and maintenance power outage losses. m It can be written as:

[0103]

[0104] Among them, C xx The cost of a single minor repair of a single main transformer; C dx The cost of a single overhaul of a single main transformer; C zc is the ship rental fee; ΔE is the power outage loss cost for overhaul; Y m is the year of overhaul; j is the jth year of overhaul or failure.

[0105] S0205: Transformer failure costs mainly include failure repair costs and the resulting power outage losses. f It can be written as:

[0106]

[0107] Where W is the fault interruption power; T is the fault interruption time; λ is the annual average failure rate of the equipment; C RC is the average cost of repairing a fault; T XF is the mean time to repair.

[0108] S0206: The scrapping cost of transformers mainly includes decommissioning disposal fees and equipment residual value, then C d It can be written as:

[0109] C d =-(0.3C i +0.3C ts )(1+i) -n

[0110] Among them, Cts The commissioning cost of the transformer is about 30%, the decommissioning disposal fee is about 30% of the commissioning fee, and the residual value is about 30% of the purchase cost of the transformer.

[0111] S0207: According to the above calculation results, we have:

[0112] C ZB(min) =min(C ZB1 ,C ZB2 ,C ZB3 ,...,C ZBn )

[0113] According to the above formula, the optimal transformer redundancy configuration can be obtained, and the main transformer capacity S under this scheme can be obtained: c .

[0114] S03: According to the main transformer capacity S c Carry out LCC calculation of the outgoing submarine cable to determine the submarine cable selection with the best life cycle cost.

[0115] like Figure 2 As shown, the process should include the following:

[0116] S0301: The LCC model of the submarine cable is the sum of all costs of production, laying, sea area leasing, operation, maintenance, failure removal, decommissioning residual value and disposal during the whole life cycle. Its mathematical model can be written as:

[0117] C HL =C I +C F +C S +C H +C G +C Y +C H

[0118] Where: C I The purchase cost of the submarine cable; C F Cost of laying submarine cables; C S is the submarine cable operation loss cost; C H is the cost of sea area occupation; C G is the failure loss cost; C Y C is the operation and maintenance cost; H To recover the net investment cost;

[0119] S0302: The cost of purchasing submarine cables mainly includes the cost of the submarine cable itself, accessories, spare parts and related taxes, transportation costs, etc. I It can be written as:

[0120] C I =NSP G

[0121] Where: N is the number of submarine cable loops; S is the length of the submarine cable route; P G It is the purchase cost of submarine cable per unit length.

[0122] S0303: Submarine cable construction and laying costs, mainly including route exploration, roadblock clearance, submarine cable laying and post-testing costs, etc. F It can be written as:

[0123] C F =NSP F

[0124] Among them, P F is the cost of laying submarine cable per unit length;

[0125] S0304: The cost of sea area occupation is mainly based on the sea area charge standard for submarine pipelines, and the general range is 10m on both sides of the submarine cable. H It can be written as:

[0126]

[0127] Among them, D h It is the cost of unit sea area occupation, in Yuan / hectare.

[0128] S0305: Submarine cable loss mainly includes conductor loss, dielectric loss, and metal sheath and armor wire loss. Then C S It can be written as:

[0129]

[0130] Among them, P S is the loss cost per unit length of submarine cable; τ is the loss hours obtained from the transmission capacity and the utilization hours; D is the on-grid electricity price during the operation period of the site;

[0131] S0306: Fault loss costs mainly include the cost of repairing submarine cables and the cost of power outages. G It can be written as:

[0132]

[0133] Among them, f G is the submarine cable fault frequency; P G It is the economic loss caused by power outage and emergency repair loss costs.

[0134] S0307: Operation and maintenance costs, mainly including operation and maintenance, cruise monitoring costs, etc., then C Y It can be written as:

[0135]

[0136] Where PY Annual operation and maintenance costs.

[0137] S0308: Calculate the scrapping cost based on the initial investment cost of the submarine cable, including the decommissioning disposal fee and the residual value of the equipment, then C H It can be written as:

[0138] C H =-0.05C I (1+i) -n

[0139] S0309: According to the above calculation results, we have:

[0140] C HL(min) =min(C HL1 ,C HL2 ,C HL3 ,...,C HLn )

[0141] According to the above formula, the optimal submarine cable cross-section selection scheme can be obtained.

[0142] S04: Determine whether the transmission capacity matches based on the LCC cost calculation results of the optimal submarine cable section selection scheme and the optimal transformer redundancy configuration, which should specifically include the following steps:

[0143] S0401: According to the optimal submarine cable cross-section selection scheme, the current carrying capacity is calculated in the mudflat, seabed, dike pipe, J-type pipe, and cable trench. Optionally, the maximum transmission current should be I T ,I H ,I D ,I J ,I G .

[0144] S0402: According to the bottleneck section of the maximum transmission current, a transformer redundancy configuration matching the optimal submarine cable section selection is obtained. Optionally, the matching transformer capacity can be written as:

[0145]

[0146] S0403: Determine whether P is the same as the primary transformer redundancy configuration P obtained in the main transformer LCC cost calculation c Match. If P c =P, then execute S06 and output C HL(min) , C ZB(min) The optimal main transformer redundancy configuration and submarine cable selection are performed, otherwise S05 is executed for correction.

[0147] S05: According to different submarine cable section selection schemes and their current carrying capacity calculation results, the LCC calculation results of the matching transformer redundancy configuration scheme can be obtained:

[0148] C HL+ZB(min) =min(C HL+ZB1 ,C HL+ZB2 ,C HL+ZB3 ,...,C HL+ZBn )

[0149] S06: Output optimal transformer redundancy configuration and submarine cable selection C HL+ZB(min) .

[0150] According to the LCC method-based redundant configuration of offshore wind power main transformers and the method for selecting the cross-section of submarine cables, the LCC calculation of the main transformer equipment of the offshore booster station can be used to determine the preliminary cross-section of the submarine cable, and then the LCC calculation of different sending submarine cable solutions can be used to determine the optimal submarine cable selection. Finally, the current carrying capacity of the optimal submarine cable solution at different laying stages is obtained according to the laying conditions and working parameters of the wind farm area to correct the redundant configuration of the main transformer. The optimized configuration of the transmission and transformation part of the entire offshore wind farm can be achieved, and the optimal cost of the entire life cycle of the project can be achieved.

[0151] Example 2

[0152] This embodiment provides a redundant configuration of an offshore wind power main transformer and a submarine cable section selection device, including:

[0153] An acquisition unit, used for acquiring initial data of an offshore wind farm;

[0154] A main transformer LCC calculation unit is used to perform LCC calculation of the main transformer of the offshore booster station according to the initial data, and obtain the main transformer redundancy configuration and main transformer redundancy for preliminary selection of the submarine cable section;

[0155] The outgoing submarine cable LCC calculation unit is used to calculate the outgoing submarine cable LCC according to the main transformer redundancy to obtain the submarine cable cross-section selection with the optimal life cycle cost;

[0156] A judgment unit, used to judge whether the cross-section selection of the submarine cable with the best life cycle cost matches the redundancy of the main transformer, and if not, execute the correction unit; if so, execute the output unit;

[0157] The correction unit is used to first obtain the selection of different submarine cable sections and the calculation results of their current carrying capacity according to the initial data, and then calculate the LCC calculation results that match the redundant configuration of the main transformer;

[0158] The output unit is used to output the optimal transformer redundancy configuration and submarine cable section selection.

[0159] Example 3

[0160] This embodiment provides an offshore wind power main transformer redundant configuration and submarine cable section selection device, including a processor and a storage medium;

[0161] The storage medium is used to store instructions;

[0162] The processor is used to operate according to the instructions to execute the steps of the method according to any one of Embodiment 1.

[0163] Example 4

[0164] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of any method described in Embodiment 1 are implemented.

[0165] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for redundant configuration of offshore wind power main transformer and selection of submarine cable section, characterized in that: include: Obtain initial data for offshore wind farms; Calculate the LCC of the main transformer of the offshore booster station according to the initial data to obtain the main transformer redundancy configuration and main transformer redundancy for preliminary selection of the submarine cable section; including: Based on the pre-obtained transformer operation rules and key control point expenditures, the full life cycle cost of the main transformer of the offshore substation is obtained. , the formula is as follows: ； in: The initial investment cost includes equipment purchase cost, installation and commissioning cost; Operating costs, including equipment energy consumption, inspection and maintenance fees; Maintenance costs include planned maintenance fees, equipment rental fees, and power outage losses; Failure costs, including failure repair costs and power outage losses; The scrapping cost includes the decommissioning disposal fee and the residual value of the equipment; Calculated based on the pre-acquired general equipment cost and equipment installation and commissioning fees ; Running costs The formula is as follows: ； in, The on-grid electricity price for this project; No-load loss of main transformer; The annual operating hours of the main transformer; is the load loss; is the transformer load factor; is the annual loss hours; The number of main transformers; is the discount rate, which is generally obtained based on the lpr interest rate; The operating life; Maintenance cost The formula is as follows: ； in, It is the cost of a single minor repair of a single main transformer; It is the cost of one major overhaul of a single main transformer; For boat rental fees; Cost of power outage for major repairs; The year for the major overhaul; For the Annual inspection or failure; Failure Cost The formula is as follows: ； in, Interrupt power for faults; is the fault interruption time; is the average annual failure rate of the equipment; is the average cost of repairing a failure; is the mean time to repair; Scrap cost The formula is as follows: ； in, Cost of commissioning the transformer; According to the above calculation results, we have: ； According to the above formula, the optimal transformer redundancy configuration is obtained , and main transformer capacity ; The LCC calculation of the outgoing submarine cable is performed according to the redundancy of the main transformer to obtain the submarine cable section selection with the optimal life cycle cost; including: The formula for obtaining the life cycle cost of the LCC model of the submarine cable is as follows: ； in: The purchase cost of sending submarine cables; Costs for submarine cable construction and laying; The cost of submarine cable operation loss; Cost of sea area occupation; The cost of failure loss; For operation and maintenance costs; To recover the net investment cost; Submarine cable purchase cost The formula is as follows: ； in: is the number of submarine cable loops; is the length of the submarine cable route; is the purchase cost of submarine cable per unit length; Submarine cable construction and laying costs The formula is as follows: ； in, is the cost of laying submarine cable per unit length; Cost of sea area occupation The formula is as follows: ； in, The unit sea area occupation fee is RMB / hectare; S0305: Submarine cable operation loss costs The formula is as follows: ； in, is the loss cost per unit length of submarine cable; is the loss hours obtained from the transmission capacity and the utilization hours; D is the on-grid electricity price during the operation period of the site; Failure loss cost The formula is as follows: ； in, is the submarine cable fault frequency; Economic losses caused by power outage and emergency repair costs; Operation and maintenance costs The formula is as follows: ； in The annual operation and maintenance costs; Net investment cost recovery The formula is as follows: ； S0309: According to the above calculation results, we have: ； According to the above formula, the optimal submarine cable cross-section selection is obtained; Determine whether the submarine cable cross-section selection with the optimal life cycle cost matches the redundancy of the main transformer, if not, perform a correction step, and if matched, perform an output step; Correction steps: First, obtain the selection of different submarine cable sections and their current carrying capacity calculation results based on the initial data, and then calculate the LCC calculation results that match the main transformer redundancy configuration; Output step: Output the optimal transformer redundancy configuration and submarine cable section selection.

2. The method for redundant configuration of offshore wind power main transformers and selection of submarine cable cross-section according to claim 1 is characterized in that: The initial data includes one or more of wind turbine modified power curve, utilization hours, grid-connected power, and submarine cable laying conditions.

3. The method for redundant configuration of offshore wind power main transformers and selection of submarine cable cross-section according to claim 1 is characterized in that: Determining whether the submarine cable section selection with the best life cycle cost matches the redundancy of the main transformer includes: According to the optimal cross-section selection of submarine cables, the current carrying capacity is calculated in mudflats, seabed, dike pipes, J-type pipes, and cable trenches. The maximum transmission current is I T ,I H ,I D ,I J ,I G； According to the bottleneck section of the maximum transmission current, the transformer redundancy configuration matching the optimal submarine cable section selection is obtained. The matching transformer capacity formula is as follows: ； judge Is the redundant configuration of the primary transformer obtained in the LCC cost calculation of the main transformer Match; if , then execute the output step and output , The optimal main transformer redundancy configuration and submarine cable selection are selected, otherwise the correction steps are performed.

4. The method for redundant configuration of offshore wind power main transformers and selection of submarine cable cross-section according to claim 3 is characterized in that: The correction step is: first obtain the selection of different submarine cable sections and the calculation results of their current carrying capacity according to the initial data, and then calculate the LCC calculation results matching the redundant configuration of the main transformer. The formula is as follows: .

5. A device for redundant configuration of offshore wind power main transformer and selection of submarine cable section, characterized in that: include: An acquisition unit, used for acquiring initial data of an offshore wind farm; The main transformer LCC calculation unit is used to calculate the LCC of the main transformer of the offshore booster station according to the initial data, and obtain the main transformer redundancy configuration and main transformer redundancy for preliminary selection of the submarine cable section; including: Based on the pre-obtained transformer operation rules and key control point expenditures, the full life cycle cost of the main transformer of the offshore substation is obtained , the formula is as follows: ； in: The initial investment cost includes equipment purchase cost, installation and commissioning cost; Operating costs, including equipment energy consumption, inspection and maintenance fees; Maintenance costs include planned maintenance fees, equipment rental fees, and power outage losses; Failure costs, including failure repair costs and power outage losses; The scrapping cost includes the decommissioning disposal fee and the residual value of the equipment; Calculated based on the pre-acquired general equipment cost and equipment installation and commissioning fees ; Running costs The formula is as follows: ； in, The on-grid electricity price for this project; No-load loss of main transformer; The annual operating hours of the main transformer; is the load loss; is the transformer load factor; is the annual loss hours; The number of main transformers; is the discount rate, which is generally obtained based on the lpr interest rate; The operating period; Maintenance cost The formula is as follows: ； in, It is the cost of a single minor repair of a single main transformer; It is the cost of one major overhaul of a single main transformer; For boat rental fees; Cost of power outage for major repairs; The year for the major overhaul; For the Annual inspection or failure; Failure Cost The formula is as follows: ； in, Interrupt power for faults; is the fault interruption time; is the average annual failure rate of the equipment; is the average cost of repairing a failure; is the mean time to repair; Scrap cost The formula is as follows: ； in, Cost of commissioning the transformer; According to the above calculation results, we have: ； According to the above formula, the optimal transformer redundancy configuration is obtained , and main transformer capacity ; The outgoing submarine cable LCC calculation unit is used to calculate the outgoing submarine cable LCC according to the main transformer redundancy to obtain the submarine cable section selection with the optimal life cycle cost; including: The formula for obtaining the life cycle cost of the LCC model of the submarine cable is as follows: ； in: The purchase cost of sending submarine cables; Costs for submarine cable construction and laying; The cost of submarine cable operation loss; Cost of sea area occupation; The cost of failure loss; For operation and maintenance costs; To recover the net investment cost; Submarine cable purchase cost The formula is as follows: ； in: is the number of submarine cable loops; is the length of the submarine cable route; is the purchase cost of submarine cable per unit length; Submarine cable construction and laying costs The formula is as follows: ； in, is the cost of laying submarine cable per unit length; Cost of sea area occupation The formula is as follows: ； in, The unit sea area occupation fee is RMB / hectare; S0305: Submarine cable operation loss costs The formula is as follows: ； in, is the loss cost per unit length of submarine cable; is the loss hours obtained from the transmission capacity and the utilization hours; D is the on-grid electricity price during the operation period of the site; Failure loss cost The formula is as follows: ； in, is the submarine cable fault frequency; Economic losses caused by power outage and emergency repair costs; Operation and maintenance costs The formula is as follows: ； in The annual operation and maintenance costs; Net investment cost recovery The formula is as follows: ； S0309: According to the above calculation results, we have: ； According to the above formula, the optimal submarine cable cross-section selection is obtained; A judgment unit, used to judge whether the cross-section selection of the submarine cable with the optimal life cycle cost matches the redundancy of the main transformer, and if not, execute the correction unit; if so, execute the output unit; The correction unit is used to first obtain the selection of different submarine cable sections and the calculation results of their current carrying capacity according to the initial data, and then calculate the LCC calculation results that match the redundant configuration of the main transformer; The output unit is used to output the optimal transformer redundancy configuration and submarine cable section selection.

6. A device for redundant configuration of offshore wind power main transformer and selection of submarine cable section, characterized in that: including processor and storage medium; The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the steps of the method according to any one of claims 1 to 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

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