Selection and evaluation method for offshore wind power integration mode

Abstract

The invention relates to the technical field of offshore wind power integration, in particular to a selection and evaluation method of an offshore wind power integration mode, which comprises the following steps: firstly, collecting basic information of an offshore wind power system, collecting basic information of a sea area where the offshore wind power system is located, and then establishing a prediction model based on the collected various basic information; then collecting the operation cost, the maintenance cost and the scrap cost of the offshore wind power system in the target commissioning year, drawing up a plurality of grid-connected modes, finally substituting the collected information into the different grid-connected modes, and in the established prediction model, determining that the offshore wind power system is in the current grid-connected mode. The total revenue under the target production year is used for comparing the total revenue of the offshore wind power system under different grid-connected modes under the target production year, the grid-connected mode with the high total revenue is selected, the optimal grid-connected mode can be obtained through comprehensive evaluation, comprehensive evaluation is provided for offshore wind power grid-connected design, and establishment of the offshore wind power system is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power grid connection, and in particular to a method for selecting and evaluating an offshore wind power grid connection mode. Background Art

[0002] At present, offshore wind power projects are mainly built in the coastal areas with small capacity. At the same time, the offshore development level is already high, and the space for further development in the future is relatively limited. In comparison, offshore has a wider sea area, larger wind energy reserves, and better wind resources. In addition, the development of offshore wind power does not occupy the coastline and waterway resources, which can avoid adverse effects on coastal industrial production and residents' lives. It is a "potential stock" for the future development of wind power.

[0003] With the continuous improvement of the capacity of offshore wind power units and clusters, and the increasing distance from the shore, the future offshore wind power grid connection mode will develop from AC-dominated to a new mode where AC, DC, and AC / DC parallel grid connection modes coexist. However, different grid connection modes have different impacts on the safety and stability of offshore wind power systems. Currently, there is no method to select and evaluate offshore wind power grid connection modes, and it is impossible to select grid connection modes based on actual conditions, and there is a lack of comprehensive evaluation of the construction of offshore wind power systems. Summary of the invention

[0004] The purpose of the present invention is to provide a method for selecting and evaluating offshore wind power grid-connected modes, so as to solve the problems that there is no method for selecting and evaluating offshore wind power grid-connected modes in the prior art, the grid-connected mode cannot be selected according to actual conditions, and there is a lack of comprehensive evaluation of the construction of offshore wind power systems.

[0005] To achieve the above object, the present invention provides a method for selecting and evaluating an offshore wind power grid connection mode, the method comprising the following steps:

[0006] S1: Collect basic information of offshore wind power system;

[0007] S2: Collect basic information about the sea area where the offshore wind power system is located;

[0008] S3: Establish a prediction model based on various basic information collected;

[0009] S4: Collect the operating costs, maintenance costs and decommissioning costs of the offshore wind power system in the target commissioning year;

[0010] S5: Propose multiple grid connection modes;

[0011] S6: Bring the collected information into different grid-connected modes respectively, and confirm the total revenue of the offshore wind power system in the target production year under the current grid-connected mode in the established prediction model;

[0012] S7: Compare the total revenue of offshore wind power systems under different grid connection modes in the target production year, and select the grid connection mode with higher total revenue.

[0013] Among them, in step S1, the basic information of the offshore wind power system includes the distance from the shore of the sea area, the planned installed capacity, the hardware cost of the planned installed equipment and the construction cost of the wind farm.

[0014] The specific steps of step S2 are: collecting historical meteorological data and marine environment data of the sea area where the offshore wind power system is located.

[0015] Wherein, in step S3, the prediction model established includes a power prediction model, a power generation efficiency model and a time segmentation model.

[0016] Among them, in step S3, the power prediction model is used to predict the total power generation of the offshore wind farm in the target year of commissioning based on the collected historical meteorological data and marine environmental data. The power generation efficiency model is used to reflect the actual power generation efficiency of the offshore wind farm under different conditions. The time segmentation model is used to establish a power generation model for each time period to reflect the power generation characteristics in different time periods.

[0017] Among them, the specific steps of step S4 are: based on the loss cost generated during the operation of the offshore wind power system, the present value method is used to determine the operating cost, the reliability analysis method is used to analyze the maintenance costs and electricity loss costs generated when the offshore wind power system fails, and the maintenance cost is determined in combination with the present value method, and the scrapping cost is determined according to the residual value of the offshore wind power system when it is scrapped.

[0018] Wherein, in step S5, the proposed multiple grid-connected modes include an AC parallel grid-connected mode, a DC parallel grid-connected mode and a DC series grid-connected mode.

[0019] Among them, in step S6, when the collected various types of information are brought into different grid-connected modes respectively, it is necessary to collect the type of submarine cable selected in the current grid-connected mode, and collect the basic cost of the current submarine cable, the operating cost of the current submarine cable and the operation and maintenance cost of the current submarine cable.

[0020] A method for selecting and evaluating an offshore wind power grid-connected mode of the present invention first collects basic information of the offshore wind power system and basic information of the sea area where the offshore wind power system is located, then establishes a prediction model based on the collected basic information, then collects the operating cost, maintenance cost and scrapping cost of the offshore wind power system in the target production year, and formulates multiple grid-connected modes, and finally respectively brings the collected information into different grid-connected modes. In the established prediction model, the total revenue of the offshore wind power system in the target production year under the current grid-connected mode is confirmed, which is used to compare the total revenue of the offshore wind power system under different grid-connected modes in the target production year, and select the grid-connected mode with high total revenue. The technical solution can comprehensively evaluate and obtain the optimal grid-connected mode, provide a comprehensive evaluation for the offshore wind power grid-connected design, and facilitate the establishment of the offshore wind power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a flow chart of the steps of the method for selecting and evaluating the offshore wind power grid connection mode provided by the present invention. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0024] See also Figure 1 The present invention provides a method for selecting and evaluating an offshore wind power grid connection mode, and the method for selecting and evaluating an offshore wind power grid connection mode comprises the following steps:

[0025] S1: Collect basic information of offshore wind power system;

[0026] S2: Collect basic information about the sea area where the offshore wind power system is located;

[0027] S3: Establish a prediction model based on various basic information collected;

[0028] S4: Collect the operating costs, maintenance costs and decommissioning costs of the offshore wind power system in the target commissioning year;

[0029] S5: Propose multiple grid connection modes;

[0030] S6: Bring the collected information into different grid-connected modes respectively, and confirm the total revenue of the offshore wind power system in the target production year under the current grid-connected mode in the established prediction model;

[0031] S7: Compare the total revenue of offshore wind power systems under different grid connection modes in the target production year, and select the grid connection mode with higher total revenue.

[0032] In this embodiment, the basic information of the offshore wind power system is first collected, and the basic information of the sea area where the offshore wind power system is located is collected at the same time. Then, a prediction model is established based on the various basic information collected. Then, the operating cost, maintenance cost and scrapping cost of the offshore wind power system in the target production year are collected, and multiple grid-connected modes are proposed. Finally, the various types of collected information are respectively brought into different grid-connected modes. In the established prediction model, the total revenue of the offshore wind power system in the target production year under the current grid-connected mode is confirmed, which is used to compare the total revenue of the offshore wind power system under different grid-connected modes in the target production year, and select the grid-connected mode with high total revenue. The technical solution can comprehensively evaluate and obtain the optimal grid-connected mode, provide a comprehensive evaluation for offshore wind power grid-connected design, and facilitate the establishment of offshore wind power systems.

[0033] Furthermore, in step S1, the basic information of the offshore wind power system includes the distance from the shore of the sea area, the planned installed capacity, the hardware cost of the planned installed equipment and the construction cost of the wind farm.

[0034] In this embodiment, if the current offshore wind power system is a large wind farm, the wind farm construction cost includes the wind farm body construction cost, the offshore platform construction cost, the onshore substation construction cost and the AC power grid composition. When the offshore wind power is collected on the offshore platform, the offshore platform is connected to the onshore station through a submarine cable, and the onshore station is connected to the onshore AC power grid through an AC line or busbar. If the current offshore wind power system is a small wind farm, the offshore wind power is collected and directly transmitted to the shore through a submarine cable. At this time, the wind farm construction cost includes the wind farm body construction cost and the DC power grid composition.

[0035] Furthermore, the specific steps of step S2 are: collecting historical meteorological data and marine environmental data of the sea area where the offshore wind power system is located.

[0036] In this embodiment, the collected historical meteorological data include wind speed, wind direction, temperature, humidity, air pressure, etc., and the collected marine environment data include wave height, current speed, sea water temperature, salinity, etc.

[0037] Furthermore, in step S3, the established prediction model includes a power prediction model, a power generation efficiency model and a time segmentation model. The power prediction model is used to predict the total power generation of the offshore wind farm in the target production year based on the collected historical meteorological data and marine environmental data. The power generation efficiency model is used to reflect the actual power generation efficiency of the offshore wind farm under different conditions. The time segmentation model is used to establish a power generation model for each time period to reflect the power generation characteristics in different time periods.

[0038] Furthermore, the specific steps of step S4 are: based on the loss costs generated during the operation of the offshore wind power system, the present value method is used to determine the operating costs, the reliability analysis method is used to analyze the maintenance costs and electricity loss costs generated when the offshore wind power system fails, the maintenance costs are determined in combination with the present value method, and the scrapping costs are determined based on the residual value of the offshore wind power system when it is scrapped.

[0039] In this embodiment, the reliability analysis method is used to analyze the maintenance costs and electricity loss costs generated when the offshore wind power grid-connected system fails, and the maintenance cost is determined in combination with the present value method. After the system is built, failures may occur during operation, and repairs are required when failures occur. During the repair process, power generation cannot be carried out, which may also cause some electricity loss. Therefore, the maintenance cost is determined based on the maintenance costs and electricity loss costs using the reliability analysis method, and the scrapping cost is determined based on the residual value of the offshore wind power grid-connected system when it is scrapped. In addition, when calculating the scrapping cost, it is necessary to determine the residual value generated by equipment recycling and the cost of the recycling work itself.

[0040] Furthermore, in step S5, the proposed multiple grid-connected modes include an AC parallel grid-connected mode, a DC parallel grid-connected mode and a DC series grid-connected mode.

[0041] In this embodiment, when the AC parallel grid-connected mode is adopted, each wind turbine is connected in parallel to the offshore substation after local AC boosting. The connection method is intuitive and easy to implement, with high flexibility in control, and can adapt to different grid requirements and wind farm operating conditions. When the DC parallel grid-connected mode is adopted, the required offshore platform area is smaller, which is conducive to reducing construction and operation and maintenance costs, and DC cables are used for connection, which has lower costs than AC cables. When the DC series grid-connected mode is adopted, centralized transformers and offshore VSC converter stations are not required, so there is no need to build offshore platforms, which greatly reduces the construction cost of offshore wind farms.

[0042] Furthermore, in step S6, when the various types of collected information are respectively brought into different grid connection modes, it is necessary to collect the type of submarine cable selected in the current grid connection mode, and collect the basic cost of the current submarine cable, the operating cost of the current submarine cable and the operation and maintenance cost of the current submarine cable.

[0043] In this embodiment, when different grid-connected modes are required, it is necessary to collect the type of submarine cable selected in the corresponding grid-connected mode, and collect the basic cost of the current submarine cable, the operating cost of the current submarine cable and the operation and maintenance cost of the current submarine cable, so as to calculate the total revenue of the offshore wind power system in the target production year under the current grid-connected mode in the prediction model.

[0044] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A method for selecting and evaluating an offshore wind power grid connection mode, characterized in that: The steps include: S1: Collect basic information of offshore wind power system; S2: Collect basic information about the sea area where the offshore wind power system is located; S3: Establish a prediction model based on various basic information collected; S4: Collect the operating costs, maintenance costs and decommissioning costs of the offshore wind power system in the target commissioning year; S5: Propose multiple grid connection modes; S6: Bring the collected information into different grid-connected modes respectively, and confirm the total revenue of the offshore wind power system in the target production year under the current grid-connected mode in the established prediction model; S7: Compare the total revenue of offshore wind power systems under different grid connection modes in the target production year, and select the grid connection mode with higher total revenue.

2. The method for selecting and evaluating the offshore wind power grid connection mode according to claim 1, characterized in that: In step S1 , the basic information of the offshore wind power system includes the distance from the shore of the sea area, the planned installed capacity, the hardware cost of the planned installed equipment and the construction cost of the wind farm.

3. The method for selecting and evaluating the offshore wind power grid connection mode according to claim 2, characterized in that: The specific steps of step S2 are: collecting historical meteorological data and marine environment data of the sea area where the offshore wind power system is located.

4. The method for selecting and evaluating the offshore wind power grid connection mode according to claim 3, characterized in that: In step S3, the prediction model established includes a power prediction model, a power generation efficiency model and a time segmentation model.

5. The method for selecting and evaluating the offshore wind power grid connection mode according to claim 4, characterized in that: In step S3, the power prediction model is used to predict the total power generation of the offshore wind farm in the target year of commissioning based on the collected historical meteorological data and marine environmental data. The power generation efficiency model is used to reflect the actual power generation efficiency of the offshore wind farm under different conditions. The time segmentation model is used to establish a power generation model for each time period to reflect the power generation characteristics in different time periods.

6. The method for selecting and evaluating the offshore wind power grid connection mode according to claim 5, characterized in that: The specific steps of step S4 are: based on the loss cost generated during the operation of the offshore wind power system, the present value method is used to determine the operating cost, the reliability analysis method is used to analyze the maintenance costs and electricity loss costs generated when the offshore wind power system fails, the maintenance cost is determined in combination with the present value method, and the scrapping cost is determined based on the residual value of the offshore wind power system when it is scrapped.

7. The method for selecting and evaluating the offshore wind power grid connection mode according to claim 3, characterized in that: In step S5, the proposed multiple grid-connected modes include an AC parallel grid-connected mode, a DC parallel grid-connected mode and a DC series grid-connected mode.

8. The method for selecting and evaluating the offshore wind power grid connection mode according to claim 7, characterized in that: In step S6, when the various types of collected information are brought into different grid connection modes respectively, it is necessary to collect the type of submarine cable selected in the current grid connection mode, and collect the basic cost of the current submarine cable, the operating cost of the current submarine cable and the operation and maintenance cost of the current submarine cable.

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