A method for selecting the height of a collector line for a wind farm crossing tower

Abstract

The present invention provides a method for selecting the height of a collector line for a wind farm crossing tower, comprising the following steps: Step S1, collecting the soil moisture content data and soil porosity data at the installation location of the crossing tower; Step S2, constructing an uplift and subsidence model of the crossing tower; Step S3, inputting the soil moisture content data and soil porosity data into the uplift and subsidence model to obtain an uplift threshold and a subsidence threshold; Step S4, obtaining the obstacles between the two crossing towers; Step S5, obtaining the installation height of the collector line according to the obstacles, the uplift threshold and the subsidence threshold. By using the soil moisture content data and soil porosity data as the input of the uplift and subsidence model of the crossing tower, after obtaining the uplift threshold and the subsidence threshold, the installation height of the collector line can be selected in combination with the position of the obstacles between the crossing towers, preventing the collector line from contacting other obstacles when the crossing tower undergoes uplift or subsidence, resulting in abnormal power transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of wind farm construction, and particularly relates to a method for selecting the height of a collector line for a wind farm crossing tower. Background Art

[0002] A wind farm mainly consists of wind turbines, a substation, and an in-field collector line. Generally, a one-to-one connection form of one wind turbine and one transformer is adopted for the wind turbines and the substation, and the corresponding wind turbines and substations are connected through the in-field collector line. To ensure the power generation quality and the normal transmission of electric energy, the wind farm has relatively high requirements for the path of its in-field collector line. The path should be as short as possible, and the lines should avoid crossing each other. However, due to the existence of terrain, in-field obstacles, etc., if direct wiring is carried out, some lines will cross. Therefore, in a wind farm, large crossing frames are set up to achieve the crossing between lines and between lines and the main line to avoid crossing.

[0003] In the current wind farm construction, basically, the height of the collector line on the crossing frame is selected by considering existing obstacles, buildings, etc., without considering the possible upheaval and subsidence of the crossing tower during long-term use. If the distance between the collector line and the upper and lower obstacles is too short during the construction of the wind farm, when the crossing tower undergoes upheaval or subsidence, the collector line will come into contact with the obstacles, resulting in the inability to transmit electric energy. Summary of the Invention

[0004] In view of this, the present invention proposes a method for selecting the height of a collector line for a wind farm crossing tower, which collects data on the soil moisture content and soil porosity of the soil where the crossing tower foundation is installed, obtains the upheaval and subsidence probabilities of the crossing tower, and thereby obtains the installation height of the collector line to ensure the normal transmission of electric energy.

[0005] The technical solution of the present invention is realized as follows:

[0006] A method for selecting the height of a collector line for a wind farm crossing tower includes the following steps:

[0007] Step S1: Collect data on the soil moisture content and soil porosity of the installation location of the crossing tower;

[0008] Step S2: Construct an upheaval and subsidence model of the crossing tower;

[0009] Step S3: Input the soil moisture content data and soil porosity data into the upheaval and subsidence model to obtain the upheaval threshold and the subsidence threshold;

[0010] Step S4: Obtain the obstacles between two crossing towers;

[0011] Step S5: Obtain the installation height of the collector line according to the obstacles, the upheaval threshold, and the subsidence threshold.

[0012] Preferably, the specific steps of collecting the soil moisture content at the installation position of the crossing tower in step S1 include:

[0013] Step S11: Insert the electrodes into the soil at the installation position of the crossing tower;

[0014] Step S12: Collect the current data of the circuit where the electrodes are located;

[0015] Step S13: Obtain the soil resistivity based on the current data;

[0016] Step S14: Obtain the soil moisture content data based on the soil resistivity;

[0017] Preferably, the number of electrodes in step S11 is two. After performing steps S11 - S14, change the positions of the two electrodes, and repeat steps S11 - S14. Finally, calculate the average value of all the soil moisture content data.

[0018] Preferably, the specific steps of collecting the soil porosity data at the installation position of the crossing frame in step S1 include:

[0019] Step S15: Insert the force - receiving rods covered with pressure sensors into the soil at the installation position of the crossing frame, and arrange the force - receiving rods in a circular distribution;

[0020] Step S16: Control the drill rod to drill into the soil from the center of the circle formed by the force - receiving rods;

[0021] Step S17: The pressure sensors collect the difference in soil pressure before and after the drill rod drills into the soil;

[0022] Step S18: Obtain the soil porosity data based on the difference in soil pressure;

[0023] Preferably, a circular baffle is arranged on the outer side of the drill rod in step S16. The circular baffle is located on the ground, and the drill rod passes through the circular baffle and drills into the soil.

[0024] Preferably, the specific steps of step S2 include:

[0025] Step S21: Obtain the historical uplift and subsidence data of the crossing tower. The historical uplift data includes the uplift height and the corresponding soil moisture content and soil porosity, and the historical subsidence data includes the subsidence depth and the corresponding soil moisture content and soil porosity;

[0026] Step S22: Divide the historical uplift and subsidence data into a training set and a test set;

[0027] Step S23: Construct a double-input and double-output neural network, input the training set into the double-input and double-output neural network for training, and test the accuracy of the double-input and double-output neural network through the test set.

[0028] Step S24: Obtain the trained uplift and subsidence model after the accuracy meets the preset requirements.

[0029] Preferably, the specific steps of step S3 are as follows: Take the collected soil moisture content data and soil porosity data as the input of the uplift and subsidence model. After being processed by the uplift and subsidence model, the uplift height and subsidence depth are obtained, and the uplift height and subsidence depth are respectively output as the uplift threshold and subsidence threshold.

[0030] Preferably, the obstacles in step S4 include ground obstacles and aerial obstacles. The ground obstacles include roads, villages, and bridges, and the aerial obstacles include power transmission lines.

[0031] Preferably, the specific steps of step S5 include:

[0032] Step S51: Determine whether the obstacle is a ground obstacle or an aerial obstacle.

[0033] Step S52: When the obstacle is a ground obstacle, the installation height of the collector line is the sum of the standard height and the subsidence threshold.

[0034] Step S53: When the obstacle is an aerial obstacle, if the collector line is above the aerial obstacle, the distance between the collector line and the aerial obstacle is greater than the subsidence threshold; if the collector line is below the aerial obstacle, the distance between the collector line and the aerial obstacle is greater than the uplift threshold.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] The present invention provides a method for selecting the height of the collector line for a wind farm crossing tower. In an existing wind farm, the installation position of the crossing tower is obtained, and then the soil moisture content data and soil porosity data at the installation position of the crossing tower are collected. The collected data is input into the constructed uplift and subsidence model, and the uplift threshold and subsidence threshold of the crossing tower can be obtained. Then, according to the uplift threshold, subsidence threshold, and obstacles in the area to be installed, the installation height of the collector line can be determined, thereby preventing power outages caused by the contact between the collector line and the obstacles when the crossing tower undergoes uplift or subsidence during long-term use and ensuring the normal transmission of electric energy. Description of the Drawings

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only the preferred embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0038] Figure 1 It is a flowchart of a method for selecting the height of a collector line for a wind farm crossing tower according to the present invention;

[0039] Figure 2 It is a schematic structural diagram of a method for collecting soil porosity data for selecting the height of a collector line for a wind farm crossing tower according to the present invention;

[0040] In the figure, 1 is a pressure sensor, 2 is a stress rod, 3 is a drill rod, 4 is a circular baffle, 5 is a bearing plate, 6 is a rotary motor, and 7 is an electric telescopic rod. Detailed implementation manners

[0041] To better understand the technical content of the present invention, a specific embodiment is provided below, and the present invention will be further described in conjunction with the drawings.

[0042] See Figures 1 to 2 , a method for selecting the height of a collector line for a wind farm crossing tower provided by the present invention includes the following steps:

[0043] Step S1: Collect the soil moisture content data and soil porosity data at the installation location of the crossing tower;

[0044] Step S2: Construct an uplift and subsidence model of the crossing tower;

[0045] Step S3: Input the soil moisture content data and soil porosity data into the uplift and subsidence model to obtain the uplift threshold and subsidence threshold;

[0046] Step S4: Obtain the obstacles between the two crossing towers;

[0047] Step S5: Obtain the installation height of the collector line according to the obstacles, uplift threshold, and subsidence threshold.

[0048] A method for selecting the height of a collector line for a wind farm crossing tower is used to select the height of the collector line in a wind farm, prevent the collector line from crossing other lines and obstacles in the field area, and ensure the normal transmission of electric energy. For the selection of the height of the collector line, compared with the traditional method of determining the height by manual experience, the present invention can accurately obtain the installation height of the collector line through data collection, modeling and analysis, thereby avoiding the occurrence of crossing accidents. At the same time, the present invention considers the uplift and subsidence accidents that may occur during the long-term use of the crossing tower, and uses this as the selection of the installation height of the collector line. Even if the crossing tower uplifts or subsides during use, the collector line will not come into contact with other lines or obstacles, providing a safety protection area for the collector line.

[0049] When selecting the height of the collector line, first obtain the installation positions of the crossing towers in the wind farm, then collect the soil moisture content data and soil porosity data of the installation positions of each crossing tower, and construct an uplift and subsidence model for the crossing tower. The input of the uplift and subsidence model is the soil moisture content data and soil porosity data, and the output is the uplift threshold and subsidence threshold. Finally, based on the uplift threshold, subsidence threshold and obstacles between the crossing towers, the installation height of the collector line can be obtained, and the collector line can be installed accordingly, which can avoid the crossing of the collector line with other lines and fixed obstacles and ensure the normal transmission of electric energy.

[0050] The reasons for selecting the soil moisture content and soil porosity are as follows: When the temperature is low in winter, the water in the soil freezes and the soil expands. If the soil porosity is low, the degree of upward protrusion of the frozen soil will be higher, that is, the uplift height is related to both the soil moisture content and soil porosity. In addition, the amount of soil moisture content is also related to soil subsidence. The higher the moisture content, the easier it is to subside. In addition, the soil porosity also affects the depth of subsidence. A lower soil porosity indicates a larger space between soil particles, and the possibility and depth of subsidence are greater.

[0051] Preferably, the specific steps of collecting the soil moisture content at the installation position of the crossing tower in step S1 include:

[0052] Step S11: Insert the electrode into the soil at the installation position of the crossing tower;

[0053] Step S12: Collect the current data of the circuit where the electrode is located;

[0054] Step S13: Obtain the soil resistivity according to the current data;

[0055] Step S14: Obtain the soil moisture content data according to the soil resistivity;

[0056] Preferably, the number of electrodes in step S11 is two. After steps S11 - S14 are executed, the positions of the two electrodes are changed, and steps S11 - S14 are repeatedly executed. Finally, the mean value of all soil moisture content data is calculated.

[0057] When collecting the soil moisture content, indirect data collection is carried out by means of resistivity measurement. Two electrodes are inserted into the soil at the installation position of the crossing tower, and then electricity is applied to the electrodes to collect the current data of the circuit where the electrodes are located. In this way, the soil resistivity can be obtained, and then the soil moisture content can be obtained according to the relationship between the resistivity and the moisture content of different types of soil in different environments and latitudes in existing research.

[0058] In addition, to ensure the accuracy of data collection, the electrodes are inserted into different positions for multiple data collections, and finally the mean value is taken to obtain the soil moisture content data.

[0059] Preferably, the specific steps of step S1 for collecting the soil porosity data at the installation position of the crossing frame include:

[0060] Step S15: Insert the stress rod 2 with the pressure sensor 1 covered on the surface into the soil at the installation position of the crossing tower, and make the stress rod 2 distributed in a ring shape;

[0061] Step S16: Control the drill rod 3 to drill into the soil from the center of the ring formed by the stress rod 2. A circular baffle 4 is arranged outside the drill rod 3, and the circular baffle 4 is located on the ground. The drill rod 3 passes through the circular baffle 4 and drills into the soil;

[0062] Step S17: The pressure sensor 1 collects the difference in soil pressure before and after the drill rod 3 drills into the soil;

[0063] Step S18: Obtain the soil porosity data according to the difference in soil pressure.

[0064] The collection of the soil porosity of the present invention adopts the method of pressure detection. First, several stress rods 2 are buried in the soil at the installation position of the crossing tower. The surface of the stress rod 2 is covered with a pressure sensor 1, and at the same time, the stress rod 2 is distributed in a ring shape. After the stress rod 2 is installed, the soil pressure data received by the pressure sensor 1 at this time is obtained. Then, the drill rod 3 is controlled to drill into the soil. The position of the drill rod 3 is located at the center of the stress rod 2. When the drill rod 3 drills into the soil, the soil will squeeze around, so that the pressure data collected by the pressure sensor 1 continuously changes. When the drill rod 3 finishes working, the pressure sensor 1 obtains the soil pressure data at this time and compares it with the initial pressure data, so as to obtain the pressure difference. The soil porosity data can be obtained according to the pressure difference and the soil type.

[0065] During the entire process of the drill pipe 3 drilling into the soil, the circular baffle 4 is always above the ground, which can prevent the soil from overflowing outward and ensure that the soil spreads around during the drilling process. The process of drilling soil is mainly driven by the rotary motor 6 and the electric telescopic rod 7.

[0066] Regarding how to calculate the soil porosity data through the pressure difference, the present invention constructs an additional model. First, a soil sample with a known porosity is obtained, and then the pressure data collected by the pressure sensor 1 before and after the soil drilling process is obtained by drilling, and the pressure difference is obtained therefrom. The pressure difference and the porosity are used as the training set of the neural network for training. Finally, the trained neural network can obtain the corresponding porosity according to the soil pressure difference.

[0067] Preferably, the specific steps of step S2 include:

[0068] Step S21: Obtain the historical uplift and subsidence data of the crossing tower. The historical uplift data includes the uplift height and the corresponding soil moisture content and soil porosity. The historical subsidence data includes the subsidence depth and the corresponding soil moisture content and soil porosity;

[0069] Step S22: Divide the historical uplift and subsidence data into a training set and a test set;

[0070] Step S23: Construct a double-input and double-output neural network, input the training set into the double-input and double-output neural network for training, and test the accuracy of the double-input and double-output neural network through the test set;

[0071] Step S24: Obtain the trained uplift and subsidence model after the accuracy meets the preset requirements.

[0072] The specific steps of step S3 are as follows: The collected soil moisture content data and soil porosity data are used as the input of the uplift and subsidence model. After being processed by the uplift and subsidence model, the uplift height and the subsidence depth are obtained, and the uplift height and the subsidence depth are respectively output as the uplift threshold and the subsidence threshold.

[0073] The uplift and subsidence model of the present invention is implemented by using a double-input and double-output neural network. After being trained by the training set and tested by the test set, it can be used. After training is completed, the soil moisture content data and the soil porosity data are used as the input of the model. After being processed by the double-input and double-output neural network, the uplift height and the subsidence depth can be output. Among them, the uplift height is used as the uplift threshold, and the subsidence depth is used as the subsidence threshold.

[0074] Preferably, the obstacles in step S4 include ground obstacles and aerial obstacles. The ground obstacles include roads, villages, and bridges. The aerial obstacles include transmission lines.

[0075] Preferably, the specific steps of step S5 include:

[0076] Step S51, determine whether the obstacle is a ground obstacle or an aerial obstacle;

[0077] Step S52, when the obstacle is a ground obstacle, the installation height of the collector line is the sum of the standard height and the subsidence threshold;

[0078] Step S53, when the obstacle is an aerial obstacle, if the collector line is above the aerial obstacle, the distance between the collector line and the aerial obstacle is greater than the subsidence threshold, and if the collector line is below the aerial obstacle, the distance between the collector line and the aerial obstacle is greater than the uplift threshold.

[0079] After obtaining the uplift threshold and the subsidence threshold, obtain the obstacles between two span towers. There are two types of obstacles, namely ground obstacles and aerial obstacles. When the obstacle to be crossed is a ground obstacle, only the subsidence threshold needs to be considered at this time to ensure that the span tower will not affect the ground obstacle when it subsides. When the obstacle to be crossed is an aerial obstacle such as an overhead line, there are two installation methods for the collector line at this time. The first is to set it above the aerial obstacle. At this time, to prevent the collector line from subsiding and contacting the aerial obstacle, the distance between the collector line and the aerial obstacle needs to be greater than the subsidence threshold. The second is to set it below the aerial obstacle. To prevent the collector line from uplifting and contacting the aerial obstacle, it is necessary to ensure that the distance between the collector line and the aerial obstacle is greater than the uplift threshold.

[0080] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for selecting the height of a collector line for a wind farm crossing tower, characterized in that It includes the following steps: Step S1, collect the soil moisture content data and soil porosity data at the installation position of the crossing tower; Step S2, construct the uplift and subsidence models of the crossing tower; Step S3, input the soil moisture content data and soil porosity data into the uplift and subsidence models to obtain the uplift threshold and subsidence threshold; Step S4, obtain the obstacles between the two crossing towers; Step S5, obtain the installation height of the collector line according to the obstacles, uplift threshold and subsidence threshold; The specific steps of step S2 include: Step S21, obtain the historical uplift and subsidence data of the crossing tower. The historical uplift data includes the uplift height and the corresponding soil moisture content and soil porosity, and the historical subsidence data includes the subsidence depth and the corresponding soil moisture content and soil porosity; Step S22, divide the historical uplift and subsidence data into a training set and a test set; Step S23, construct a double-input and double-output neural network, input the training set into the double-input and double-output neural network for training, and test the accuracy of the double-input and double-output neural network through the test set; Step S24, obtain the trained uplift and subsidence models after the accuracy meets the preset requirements.

2. A method for selecting the height of a collector line for a wind farm crossing tower according to claim 1, characterized in that, The specific steps for step S1 to collect the soil moisture content at the installation position of the crossing tower include: Step S11, insert the electrodes into the soil at the installation position of the crossing tower; Step S12, collect the current data of the circuit where the electrodes are located; Step S13, obtain the soil resistivity according to the current data; Step S14, obtain the soil moisture content data according to the soil resistivity.

3. A method for selecting the height of a collector line for a wind farm crossing tower according to claim 2, characterized in that, The number of electrodes in step S11 is two. After performing steps S11 - S14, change the positions of the two electrodes, and repeat steps S11 - S14. Finally, calculate the mean value of all the soil moisture content data.

4. A method for selecting the height of a collector line for a wind farm crossing tower according to claim 1, characterized in that, The specific steps for step S1 to collect the soil porosity data at the installation position of the crossing frame include: Step S15, insert the force-bearing rods covered with pressure sensors into the soil at the installation position of the crossing frame, and make the force-bearing rods distributed in a ring shape; Step S16, control the drill rod to drill into the soil from the center of the ring formed by the force-bearing rods; Step S17, the pressure sensors collect the difference in soil pressure before and after the drill rod drills into the soil; Step S18, obtain the soil porosity data according to the difference in soil pressure.

5. A method for selecting the height of a collector line for a wind farm crossing tower according to claim 4, characterized in that, A circular baffle is arranged outside the drill rod in step S16. The circular baffle is located on the ground, and the drill rod passes through the circular baffle and drills into the soil.

6. The method for selecting the height of a collector line for a wind farm crossing tower according to claim 1, wherein The specific steps of step S3 are: take the collected soil moisture content data and soil porosity data as the input of the uplift and subsidence models. After being processed by the uplift and subsidence models, obtain the uplift height and subsidence depth, and output the uplift height and subsidence depth as the uplift threshold and subsidence threshold respectively.

7. A method for selecting the height of a collector line for a wind farm crossing tower according to claim 1, characterized in that, The obstacles in step S4 include ground obstacles and aerial obstacles. The ground obstacles include roads, villages and bridges, and the aerial obstacles include transmission lines.

8. A method for selecting the height of a collector line for a wind farm crossing tower according to claim 7, characterized in that, The specific steps of step S5 include: Step S51, judge whether the obstacle is a ground obstacle or an aerial obstacle; Step S52: When the obstacle is a ground obstacle, the installation height of the collector line is the sum of the standard height and the subsidence threshold value; Step S53: When the obstacle is an aerial obstacle, if the collector line is above the aerial obstacle, the distance between the collector line and the aerial obstacle is greater than the subsidence threshold value; if the collector line is below the aerial obstacle, the distance between the collector line and the aerial obstacle is greater than the uplift threshold value.

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