CN112949227A - Method, system, equipment and storage medium suitable for determining turbulence intensity of wind field in complex terrain - Google Patents
Method, system, equipment and storage medium suitable for determining turbulence intensity of wind field in complex terrain Download PDFInfo
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Abstract
The invention discloses a method, a system, equipment and a storage medium suitable for determining the turbulence intensity of a wind field in a complex terrain, wherein the method comprises the following steps: establishing an ideal model of the wind field terrain according to the terrain information; generating a grid file from the ideal model, and performing flow field solution on the grid file to obtain a computational grid meeting grid independence requirements; performing sub-sector fine simulation calculation on the flow field according to a calculation grid; and generating a turbulence intensity rose diagram at the representative point position in the wind field according to the fine simulation calculation result of the sub-sectors. The method is suitable for different types of data sources and wind resource data sources, can adjust the calculation precision and the calculation range according to the needs of users, and lays a good foundation for the subsequent micro-site selection and investment of wind fields.
Description
Technical Field
The invention relates to the field of wind field hydromechanics application, in particular to a method, a system, equipment and a storage medium suitable for determining the wind field turbulence intensity of complex terrain.
Background
In recent years, with the rapid development of the wind power generation industry, the main area of onshore wind power development begins to shift from plains to complex mountains. In the early stage of wind power plant planning, the main design focuses on detailed analysis of wind speed distribution, the processing of turbulence is usually only focused on a wind measuring tower, and the turbulence intensity of the wind measuring tower is used for representing the turbulence intensity of the wind field all over site. The method is high in feasibility in plain areas, but if the method is applied to complex mountain environments, due to the fact that roughness is increased due to terrain change, turbulence intensity difference at each position of a wind field is large, and the problem that a unit selected by a rear door cannot meet the requirement of turbulence intensity in operation often exists.
Disclosure of Invention
Aiming at the difficult problems mentioned in the background art, the invention aims to provide a method, a system, equipment and a storage medium for determining the turbulence intensity of a wind field suitable for a complex terrain based on a wind resource offline data set.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for determining the turbulence intensity of a wind field suitable for complex terrain comprises the following steps:
establishing an ideal model of the wind field terrain according to the terrain information;
generating a grid file from the ideal model, and performing flow field solution on the grid file based on the boundary condition of the wind field inlet to obtain a computational grid meeting grid independence requirements; performing sub-sector fine simulation calculation on the flow field according to the calculation grid, and setting boundary conditions of an inlet of the wind field according to the calculation sectors to obtain the turbulence intensity of the sector at the representative point position;
and summarizing according to the turbulence intensity of the representative point positions of the sectors to generate a turbulence intensity rose diagram of the representative point positions of the wind field.
As a further improvement of the invention, the terrain information is the land data in the primary site and the nearby preset range which are mapped on the spot or acquired by utilizing the DEM database.
As a further improvement of the invention, the density of the grid file and the complexity of the local terrain need to be in positive correlation, and a grid needs to be encrypted at a preset machine position.
As a further improvement of the present invention, the step of obtaining the computational grid satisfying the grid independence requirement specifically includes:
and improving the grid resolution, repeatedly generating a grid file by the ideal model, and performing flow field solving on the grid file to obtain the computational grid meeting the grid independence requirement.
As a further improvement of the present invention, the requirement of grid independence is satisfied that the grid number ratio and the wind speed and turbulence intensity ratio at the representative point both satisfy:
wherein: n isiThe total number of the ith set of grid grids; n isjThe total number of the j set of grid grids; v. ofiRepresenting the wind speed of a point position in the ith set of grids; v. ofjRepresenting the wind speed of a point location in the jth set of grids; i isTiRepresenting the turbulence intensity of points in the ith set of grids; i isTjThe turbulence intensity of the point position is represented in the j-th set of grids.
As a further improvement of the invention, the sub-sectors divide the wind direction of 360 degrees into a plurality of wind direction sectors, and the boundary condition setting is carried out according to the wind direction of the sectors.
As a further improvement of the invention, the representative point positions in the wind field comprise preset machine position points and point positions which can represent the local shape characteristics.
A wind field turbulence intensity determination system suitable for complex terrain, comprising:
the model building module is used for building an ideal model of the wind field terrain according to the terrain information;
the simulation calculation module is used for generating a grid file from the ideal model and carrying out flow field solution on the grid file to obtain a calculation grid meeting the grid independence requirement; performing sub-sector fine simulation calculation on the flow field according to a calculation grid;
and the result generation module is used for generating a turbulence intensity rose diagram at the representative point position in the wind field according to the sub-sector fine simulation calculation result.
A wind field turbulence intensity determination system suitable for complex terrain, comprising:
the model building module is used for building an ideal model of the wind field terrain according to the terrain information;
the simulation calculation module is used for generating a grid file from the ideal model and carrying out flow field solution on the grid file based on the boundary condition of the wind field entrance to obtain a calculation grid meeting the grid independence requirement; performing sub-sector fine simulation calculation on the flow field according to the calculation grid, and setting boundary conditions of an inlet of the wind field according to the calculation sectors to obtain the turbulence intensity of the sector at the representative point position;
and the result generation module is used for summarizing the turbulence intensity at the representative point position of each sector and generating a turbulence intensity rose diagram at the representative point position of the wind field.
An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method for determining wind field turbulence intensity for complex terrain when executing the computer program.
A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for complex terrain wind park turbulence intensity determination.
Compared with the prior art, the method has the beneficial effects that:
the method provided by the invention is combined with field wind measurement of the mountain wind power plant and a full-field wind resource offline numerical simulation result based on a computational fluid dynamics mode, and a real-time visual assessment method for refined wind resources in a field based on a wind power plant operation and maintenance system is researched on the premise of existing software and hardware resources, so that the actual problem in an intelligent operation and maintenance link of the in-service mountain wind power plant is solved. The method for determining the turbulence intensity of the wind field in the complex terrain has high operability, is suitable for different terrain characteristics and wind resource characteristic areas, is simple and convenient to operate, and can obtain more precise and accurate turbulence intensity distribution of different sectors. The method is suitable for different graphic data sources and wind resource data sources, and can adjust the calculation precision and the calculation range according to the needs of users, thereby laying a good foundation for the subsequent micro site selection and investment of wind fields.
Drawings
The present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a three-dimensional topographical map generated in an embodiment of the present invention;
FIG. 3 is a computational grid diagram in an embodiment of the invention;
FIG. 4 is a rose of turbulence intensity obtained in an example of the invention;
FIG. 5 is a schematic structural diagram of a wind field turbulence intensity determination system suitable for complex terrain according to the present invention;
FIG. 6 is a schematic structural diagram of an electronic device according to the present invention.
Detailed Description
In order to make the objects and technical solutions of the present invention clearer and easier to understand. The present invention will be described in further detail with reference to the following drawings and examples.
As shown in FIG. 1, the invention relates to a method for determining the turbulence intensity of a wind field suitable for complex terrain, which comprises the following steps:
1) establishing an ideal model of the wind field terrain through modeling software according to the terrain information;
in the step 1), the terrain information is primary site obtained by field mapping or by using a DEM database and terrain data in a nearby preset range.
2) Importing the ideal model obtained in the step 1) into computational fluid dynamics preprocessing software to generate a grid file;
in the step 2), the density of the grids and the complexity of the local terrain need to be in positive correlation, and the grids need to be encrypted at preset machine positions.
3) Importing the grid file obtained in the step 2) into CFD solving software or a solver to carry out flow field solving;
4) improving the grid resolution, and repeating the step 2) and the step 3) to obtain a computational grid meeting the grid independence requirement;
in the step 4), the grid independence requirement is met, namely the grid number ratio and the wind speed and turbulence intensity ratio at the representative point position both meet:
wherein: n isiThe total number of the ith set of grid grids; n isjThe total number of the j set of grid grids; v. ofiRepresenting the wind speed of a point position in the ith set of grids; v. ofjRepresenting the wind speed of a point location in the jth set of grids; i isTiRepresenting the turbulence intensity of points in the ith set of grids; i isTjThe turbulence intensity of the point position is represented in the j-th set of grids.
5) Importing the calculation grid import file obtained in the step 4) into CFD solving software or a solver to perform sub-sector fine simulation calculation on a flow field, and setting a boundary condition of an air field inlet according to a calculation sector to obtain the turbulence intensity of the sector at a representative point position;
in the steps 3) and 5), the wind field entrance boundary condition data are derived from field wind measurement data, including wind measurement tower data and laser radar wind measurement data which are subjected to inspection, processing, analysis and correction.
In the step 5), the sectorization calculation refers to dividing 360-degree wind direction into a plurality of wind direction sectors, and setting boundary conditions according to the wind directions of the sectors.
6) Summarizing the turbulence intensity of the representative point positions of all the sectors obtained in the step 5) to generate a turbulence intensity rose diagram of the representative point positions of the wind field.
In step 6), the representative point locations include a preset machine point location and a point location capable of representing the local shape characteristics.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 2 and fig. 3, the present invention provides a method for determining the turbulence intensity of a wind field suitable for a complex terrain, including the following steps:
1) establishing an ideal model of the wind field terrain through modeling software according to the terrain information, as shown in figure 1;
2) importing the ideal model obtained in the step 1) into computational fluid dynamics preprocessing software to generate a grid file, as shown in fig. 3;
3) importing the grid file obtained in the step 2) into CFD solving software or a solver, setting a boundary condition of a wind field inlet and solving a flow field;
4) improving the grid resolution, and repeating the step 2) and the step 3) to obtain a computational grid meeting the grid independence requirement;
5) importing the calculation grid import file obtained in the step 4) into CFD solving software or a solver to perform sub-sector fine simulation calculation on the flow field, and setting a boundary condition of the wind field inlet according to the calculation sector;
6) a rose of turbulence intensity is generated in the wind field at the representative point locations, as shown in fig. 4.
In the present embodiment, the terrain information used in step 1) is terrain data for mapping the field.
In this embodiment, the total number of computational grids obtained after the grid resolution is increased in step 4) is 370 ten thousand, and the grid independence requirement is satisfied after verification:
in this embodiment, the wind field inlet boundary condition data used in steps 3) and 5) is the anemometer tower data after inspection, processing, analysis and correction.
In this embodiment, the sectorization calculation in step 5) divides the 360 ° wind direction into 6 wind direction sectors, and performs boundary condition setting according to the sector wind direction. The inlet wind speed is the average wind speed for that sector.
In this embodiment, the representative point selected in step 6) is the main default point.
As can be seen from fig. 4, the main wind direction turbulence intensity of the wind turbine is high, and the turbulence intensity factor should be considered in the safety model selection of the wind turbine.
As shown in fig. 5, a second object of the present invention is to provide a wind field turbulence intensity determination system suitable for complex terrain, comprising:
the model building module is used for building an ideal model of the wind field terrain according to the terrain information;
the simulation calculation module is used for generating a grid file from the ideal model and carrying out flow field solution on the grid file to obtain a calculation grid meeting the grid independence requirement; performing sub-sector fine simulation calculation on the flow field according to a calculation grid;
and the result generation module is used for generating a turbulence intensity rose diagram at the representative point position in the wind field according to the sub-sector fine simulation calculation result.
A third object of the present invention is to provide an electronic device, as shown in fig. 6, including a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for determining wind field turbulence intensity in complex terrain when executing the computer program.
A fourth object of the present invention is to provide a computer-readable storage medium, which stores a computer program, which when executed by a processor implements the steps of the method for determining wind field turbulence intensity for complex terrain.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A method for determining the turbulence intensity of a wind field suitable for complex terrain is characterized by comprising the following steps:
establishing an ideal model of the wind field terrain according to the terrain information;
generating a grid file from the ideal model, and performing flow field solution on the grid file based on the boundary condition of the wind field inlet to obtain a computational grid meeting grid independence requirements; performing sub-sector fine simulation calculation on the flow field according to the calculation grid, and setting boundary conditions of an inlet of the wind field according to the calculation sectors to obtain the turbulence intensity of the sector at the representative point position;
and summarizing according to the turbulence intensity of the representative point positions of the sectors to generate a turbulence intensity rose diagram of the representative point positions of the wind field.
2. The method for determining the turbulence intensity of the wind field with the complex terrain as claimed in claim 1, wherein the terrain information is a primary site obtained by mapping on the spot or by using a DEM database and terrain data in a nearby preset range.
3. The method for determining the wind field turbulence intensity in the complex terrain according to claim 1, wherein the density of the mesh file is positively correlated with the complexity of the local terrain, and a mesh is required to be arranged at a preset machine position.
4. The method for determining the wind field turbulence intensity suitable for the complex terrain according to claim 1, wherein the step of obtaining the computational grid meeting the grid independence requirement is specifically:
and improving the grid resolution, repeatedly generating a grid file by the ideal model, and performing flow field solving on the grid file to obtain the computational grid meeting the grid independence requirement.
5. The method for determining the wind field turbulence intensity suitable for the complex terrain according to claim 1 or 4, wherein the grid independence requirement is that the grid number ratio and the wind speed and turbulence intensity ratio at the representative point position both satisfy:
wherein: n isiThe total number of the ith set of grid grids; n isjThe total number of the j set of grid grids; v. ofjRepresenting the wind speed of a point position in the ith set of grids; v. ofjRepresenting the wind speed of a point location in the jth set of grids; i isTiRepresenting the turbulence intensity of points in the ith set of grids; i isTjThe turbulence intensity of the point position is represented in the j-th set of grids.
6. The method for determining the turbulence intensity of the wind field in the complex terrain according to claim 1, wherein the sub-sectors are defined by dividing 360-degree wind direction into a plurality of wind direction sectors and setting the boundary conditions according to the wind directions of the sectors.
7. The method for determining the turbulence intensity of the wind field suitable for the complex terrain according to claim 1, wherein the representative point locations in the wind field comprise preset machine location points and points which can represent the characteristics of the terrain.
8. A wind field turbulence intensity determination system suitable for complex terrain, comprising:
the model building module is used for building an ideal model of the wind field terrain according to the terrain information;
the simulation calculation module is used for generating a grid file from the ideal model and carrying out flow field solution on the grid file based on the boundary condition of the wind field entrance to obtain a calculation grid meeting the grid independence requirement; performing sub-sector fine simulation calculation on the flow field according to the calculation grid, and setting boundary conditions of an inlet of the wind field according to the calculation sectors to obtain the turbulence intensity of the sector at the representative point position;
and the result generation module is used for summarizing the turbulence intensity at the representative point position of each sector and generating a turbulence intensity rose diagram at the representative point position of the wind field.
9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method for determining wind field turbulence intensity for complex terrain according to any of claims 1-7 when executing the computer program.
10. A computer readable storage medium storing a computer program which when executed by a processor implements the steps of any one of claims 1 to 7 for a complex terrain wind park turbulence intensity determination method.
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Cited By (2)
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| CN113657055A (en) * | 2021-08-27 | 2021-11-16 | 西安热工研究院有限公司 | Inflow condition generation method and system for numerical simulation of wind field in complex terrain |
| CN114048634A (en) * | 2021-07-16 | 2022-02-15 | 国家石油天然气管网集团有限公司 | Oil depot tank field wind field detection point distribution method based on Fluent simulation |
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