A Development Method for Regionally Customized Offshore Wind Turbines

Abstract

The present invention discloses a method for developing regional customized offshore wind turbines, which relates to the field of offshore wind power technology. Step A: Select a target sea area and determine the wind resource conditions and other meteorological parameters in the target sea area; Step B: Determine the blade length based on the wind resource and meteorological conditions, combined with the blade production process and the lifting capacity of the construction ship; Step C: Establish an optimal capacity range calculation model, and by setting the total installed capacity of the wind farm and the offshore distance parameters, calculate the power generation and investment cost of the wind turbines under different single-unit capacities; Step D: Calculate the power generation of different wind turbine layout schemes based on the specific offshore wind power project. Starting from the perspective of optimizing the overall cost input and output, the present invention develops regional customized wind turbines by adopting regional customization, extra-long blades, and optimal single-unit capacity measures, thereby achieving the purpose of increasing the power generation utilization hours and rate of return of customized sea area wind turbines.

Description

Technical Field

[0001] The present invention relates to the field of offshore wind power technology, and in particular to a method for developing regional customized offshore wind turbines. Background Art

[0002] Offshore wind power has gradually become one of the important areas for the development of renewable energy. However, the wind turbines currently on the market are relatively expensive, and their annual utilization hours cannot meet the requirements for grid parity. In the research and development of models for grid parity, although the power generation efficiency has been improved to a certain extent, it is often restricted by the existing whole machine platform, or the blade length is limited, or the pursuit of large capacity alone has limited improvement in power generation hours. More importantly, the developed wind turbines are general-purpose and lack specificity for the target sea area. Therefore, how to develop wind turbines for the target sea area that meet grid parity, excellent performance and high yield is a difficult problem that the industry needs to solve urgently. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for developing regional customized offshore wind turbines to solve the development problem raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A method for developing a regional customized offshore wind turbine generator system includes the following steps:

[0006] Step A: Select the target sea area and determine the wind resource conditions and other meteorological parameters of the target sea area; meteorological parameters include the target sea area's annual average wind speed, wind speed, wind rose diagram, maximum wind speed, typhoon, temperature, air pressure, rainstorm and thunderstorm meteorological parameters;

[0007] Step B: Determine the blade length based on wind resources and meteorological conditions, combined with the blade production process and the lifting capacity of the construction vessel. Increase the wind swept area and power generation of the wind turbine by increasing the blade length. Carry out targeted airfoil optimization design based on wind resources and meteorological characteristics to improve the blade's wind capture capacity and performance.

[0008] Step C: Establish an optimal capacity range calculation model. By setting the total installed capacity of the wind farm and the offshore distance parameters, and based on the power generation and investment cost of wind turbines at different unit capacities, calculate the rate of return of offshore wind farms under the same scale conditions, preliminarily evaluate the range of optimal unit capacity, complete the development of the wind turbine development platform, and based on this, complete the design and development of most structures and components of the wind turbine;

[0009] Step D: Calculate the power generation of different wind turbine layouts based on the specific offshore wind power project. Combined with the project construction plan, calculate the rate of return under different unit capacities, and select the unit capacity with the highest rate of return as the customized wind turbine capacity. Finally, finalize the wind turbine design and complete the customized wind turbine development.

[0010] Preferably, the wind resource conditions of the target sea area in step A generally include: annual average wind speed, wind speed and direction distribution, maximum and extreme wind speeds, turbulence intensity and air density and other meteorological parameters.

[0011] Preferably, as a regional customization, the difference between the maximum and minimum wind speeds in the annual average wind speed range is within 0.5 m / s.

[0012] Preferably, in step B, the blade length is increased to increase the swept area and power generation; and targeted airfoil design and optimization are carried out in combination with the characteristics of wind resources in the target sea area.

[0013] Preferably, in step C, under the condition that the blade length and airfoil are determined, the rate of return of a certain wind farm under different single-unit capacities is calculated.

[0014] Preferably, the capacity determination of customized wind turbines requires accurate rate of return calculation, which requires the accuracy of power generation calculation, which can be calculated through numerical models.

[0015] Preferably, the rate of return calculation requires the accuracy of the investment cost of the wind farm. Since the investment cost structure is complex and accurate evaluation is difficult, the investment cost of the new project is calculated based on the investment final accounts data of existing offshore wind power projects, and the cost items with changes are corrected and the unchanged items are retained.

[0016] Preferably, in step C, a single-unit capacity with a yield rate of not less than 0.2% is selected as a preliminary candidate single-unit capacity, and a development platform for the customized wind turbine is determined, and most wind turbine component designs can be completed based on this.

[0017] Preferably, in step D, for a specific wind farm in a customized sea area, the single unit capacity with the best rate of return is selected, the wind turbine is finalized, and the entire design and development of the customized wind turbine set is completed.

[0018] Preferably, the selection of the single-unit capacity with the best rate of return is as follows: based on the alternative single-unit capacities determined in step C, combined with different wind turbine layout schemes to be applied, wind farm offshore distances, and site shapes, the rate of return of wind turbines of various single-unit capacities is calculated, and the single-unit capacity with the best rate of return is selected as the single-unit capacity of the wind turbine group in the wind farm.

[0019] Compared with the existing technology, the beneficial effects of the present invention are: the present invention improves the power generation hours and yield rate of customized offshore wind turbines by adopting regional customization, extra-long blades and optimal single-unit capacity measures, and develops regional customized wind turbines from the perspective of optimizing the overall cost input and output. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example

[0022] The present invention provides a technical solution: a method for developing a regional customized offshore wind turbine, which develops a customized offshore wind turbine for a certain sea area, with an annual average wind speed of 7.5 to 8 m / s at the target site and a maximum wind speed of 42.5 m / s for a 10-minute average wind speed once every 50 years.

[0023] Step A: Select the target sea area and determine the wind resource conditions and other meteorological parameters in the target sea area;

[0024] The offshore distance of the customized sea area is 50-70km, the annual average wind speed at hub height is 7.5-8.0m / s, and the annual average wind speed of 7.8m / s is used as the calculated wind speed;

[0025] Step B: Determine blade length based on wind resources and meteorological conditions, combined with blade production technology and the lifting capacity of the construction vessel. Increase the wind swept area and power generation of the wind turbine by increasing blade length. Carry out targeted airfoil optimization design based on wind resources and meteorological characteristics to improve blade wind capture capacity and performance.

[0026] The blade length is selected to be 110m. The determination of blade length should take into account technological leadership, production process maturity, and shipboard hoisting construction capabilities. Currently, the longest wind turbine blade is 107m long, and the longest blade that has rolled off the production line in China is 102m long. Therefore, the blade length of this customized wind turbine is selected to be no less than the existing blade length. The pitch diameter at the root of a 110m blade can be controlled to approximately 4.8m, and multiple blade production plants can meet the hoisting and production requirements. The hub height of a 110m blade is expected to be within 130m. Currently, there are nearly ten hoisting vessels under construction or modified in China that can meet the hoisting construction requirements of this blade.

[0027] Airfoil optimization considers the annual average wind speed and extreme wind speed of the customized sea area, and designs the aerodynamic shape and structure of the blade. The goal is to optimize the overall power generation and strive to make the Cp curve wider to cover a wider wind speed range.

[0028] Step C: Establish an optimal capacity range calculation model. By setting the total installed capacity of the wind farm and the offshore distance parameters, and based on the power generation and investment costs of wind turbines at different unit capacities, calculate the rate of return of offshore wind farms under the same scale conditions. Preliminarily evaluate the range of optimal unit capacity, complete the development of the wind turbine development platform, and based on this, complete the design and development of most structures and components of the wind turbine.

[0029] Combined with the wind farms that have been implemented and the future development trend, a 400MW wind farm is selected for analysis. The offshore distance of the wind farm is 60km, the wind farm shape is 4km×16km, and under the condition that the blade length is 110m, the single unit capacity of the wind turbine is calculated to be 7MW, 7.5MW, 8MW, 8.5MW, 9MW, 9.5MW, 10MW, and 10.5MW. The analysis is carried out on 11MW and 8MW, and under the same conditions of other measurement boundaries, the investment cost and annual utilization hours of wind turbines are calculated, and then the difference in internal rate of return of wind farm capital under different unit capacities is calculated, as shown in Table 1. Rates of return that differ by 0.2% from the maximum rate of return are considered feasible in the preliminary evaluation stage. In this example, the maximum rate of return in the preliminary evaluation stage corresponds to a unit capacity of 8MW, and the rate of return is 13.23%. The rate of return is higher than 13.03%, and the unit capacity of 13.23%-0.2% is within the alternative range. The optimal unit capacity range is 7.5-9.5MW. Based on this, the design of the blades and complete machine components of the wind turbine is completed. Among them, the generator and gearbox will be affected by the unit capacity of the wind turbine and will be determined after the actual wind farm project is determined.

[0030] Table 1 Analysis of the impact of different single-machine capacities on profitability

[0031]

[0032]

[0033] Step D: Based on the specific offshore wind power project, calculate the power generation of different wind turbine layout schemes. Combined with the project construction plan, calculate the rate of return under different unit capacities, and select the unit capacity with the highest rate of return as the customized wind turbine capacity. Finally, finalize the wind turbine design and complete the customized wind turbine development.

[0034] Based on the specific X offshore wind power project, the annual average wind speed at hub height of 7.6m / s, the wind farm site shape, the center offshore distance of 63km, the average water depth of 18m, and the seabed geological conditions of the project, the rate of return for different single-unit capacities of the project was recalculated. The maximum rate of return for 9MW was 13.51%. Therefore, the specifications of the customized wind turbine for this wind farm are 9MW-225m. Based on this, the design of the pending gearbox and generator of the wind turbine was completed, and finally the development of the customized wind turbine was completed.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for developing a regional customized offshore wind turbine, characterized in that: The steps include: Step A: Select the target sea area and determine the wind resource conditions and other meteorological parameters of the target sea area; meteorological parameters include the target sea area's annual average wind speed, wind speed, wind rose diagram, maximum wind speed, typhoon, temperature, air pressure, rainstorm and thunderstorm meteorological parameters; As a regional customization, the difference between the maximum and minimum wind speeds in the annual average wind speed range is within 0.5m / s; Step B: Determine blade length based on wind resources and meteorological conditions, combined with blade production technology and the lifting capacity of the construction vessel. Increase the wind swept area and power generation of the wind turbine by increasing blade length. Carry out targeted airfoil optimization design based on the wind resources and meteorological characteristics of the target sea area to improve the blade's wind capture capacity and performance. Step C: Establishing an optimal capacity range calculation model. By setting the total installed capacity of the wind farm and the offshore distance parameters, and based on the power generation and investment cost of wind turbines at different unit capacities, the profitability of offshore wind farms under the same scale conditions is calculated. The optimal unit capacity range is preliminarily evaluated, and the development of the wind turbine development platform is completed. Based on this, the design and development of most structures and components of the wind turbine are completed. In Step C, the unit capacity with a yield difference of no more than 0.2% from the maximum yield is selected as the preliminary candidate unit capacity, and the development platform for the customized wind turbine is determined. Based on this, the design of most wind turbine components can be completed. Step D: Calculate the power generation of different wind turbine layout schemes according to the specific offshore wind power project, calculate the rate of return under different single-unit capacities in combination with the project construction plan, and select the single-unit capacity with the largest rate of return as the capacity of the customized wind turbine set. Finally, the wind turbine is finalized to complete the development of the customized wind turbine set. In the step D, for the specific wind farm in the customized sea area, the single-unit capacity with the best rate of return is selected, the wind turbine is finalized, and the entire design and development of the customized wind turbine set is completed.

2. The method for developing a regional customized offshore wind turbine according to claim 1, characterized in that: The wind resource conditions of the target sea area in step A generally include: annual average wind speed, wind speed and direction distribution, maximum and extreme wind speeds, turbulence intensity and air density, and other meteorological parameters.

3. The method for developing a regional customized offshore wind turbine according to claim 1, characterized in that: In step B, the blade length is increased to increase the swept area and power generation; and targeted airfoil design and optimization are carried out in combination with the characteristics of wind resources in the target sea area.

4. The method for developing a regional customized offshore wind turbine according to claim 1, characterized in that: In the step C, under the condition that the blade length and airfoil are determined, the rate of return of a certain wind farm under different unit capacities is calculated.

5. The method for developing a regional customized offshore wind turbine according to claim 4, characterized in that: Customized wind turbine capacity determination requires accurate rate of return calculation, which requires the accuracy of power generation calculation, which can be obtained through numerical model calculation.

6. The method for developing a regional customized offshore wind turbine according to claim 5, characterized in that: The above-mentioned rate of return calculation requires the accuracy of the investment cost of the wind farm. Due to the complex structure of investment costs, accurate evaluation is difficult. Based on the final investment data of existing offshore wind power projects, the cost items with changes are corrected and the unchanged items are retained to calculate the investment cost of the new project.

7. The method for developing a regional customized offshore wind turbine according to claim 1, characterized in that: The selection of the unit capacity with the best rate of return: based on the alternative unit capacities determined in step C, combined with different wind turbine layout schemes to be applied, wind farm offshore distances, and site shapes, the rate of return of wind turbines of various unit capacities is calculated, and the unit capacity with the best rate of return is selected as the unit capacity of the wind turbines in the wind farm.

Images