A method, device and medium for processing comprehensive characteristic curves of a water turbine model

Abstract

The application discloses a kind of water turbine model comprehensive characteristic curve processing method, device and medium, the method includes obtaining power station unit parameter and model comprehensive characteristic curve chart, according to power station unit parameter, its rated unit parameter is calculated, and according to rated unit parameter, confirm the applicability of unit and model comprehensive characteristic curve;After confirming that unit and model comprehensive characteristic curve are applicable, the rectangular coordinate system of model comprehensive characteristic curve chart is established, and data is extracted from model comprehensive characteristic curve chart by non-orthogonal network discrete point extraction method;The data extracted is copied into Excel form, and batch processing is carried out using Excel form, and the flow-torque data table of water turbine is obtained, the picture form characteristic curve provided by water turbine manufacturing plant can be conveniently processed by the application, it is convenient for later characteristic curve extension and conversion into flow / torque three-dimensional relationship, which can be used for subsequent accurate calculation modeling simulation of hydropower station.

Description

Technical Field

[0001] This invention relates to a method, apparatus, and medium for processing the comprehensive characteristic curve of a hydro turbine model, belonging to the field of hydropower station surveying technology. Background Technology

[0002] The calculation and analysis of the transient process of a hydropower station's water conveyance system is of great significance for determining important parameters during the hydropower station's design and for selecting effective measures during operation. In the calculation of the transient process of the hydropower station's water conveyance system and generating units, it is necessary to use the turbine's comprehensive characteristic curve data to determine the unit's flow characteristics and torque characteristics. Therefore, obtaining and processing the turbine's comprehensive characteristic curve data is a prerequisite for the calculation of the hydropower station's transient process.

[0003] There are generally three methods for extracting characteristic curves: 1. Direct discretization extraction; 2. Orthogonal network discretization extraction; 3. Non-orthogonal network discretization extraction. For orthogonal networks, the axis needs to be divided into several segments, and the curve is discretized using the network nodes. For non-orthogonal networks, a network formed by the intersection of a set of equal guide vane opening lines and a set of equal lines is used to discretize the turbine characteristic curve. Currently, the comprehensive characteristic curves of turbines provided by unit manufacturers are generally in image format, and due to improper storage, the image resolution may be low and blurry. Since the transient process calculation of a hydropower station requires all calculation conditions, this can lead to errors in the subsequent characteristic curve extension.

[0004] Currently, there are two main methods for extracting turbine characteristic curve data. One is the traditional manual extraction method, which involves printing out drawings, manually drawing lines, and reading points to extract data. The efficiency depends on the skill and experience of the person drawing the lines. Obviously, this method is labor-intensive, inefficient, and time-consuming, which does not meet the time requirements for the early-stage transition process calculation of hydropower stations. The second method uses software such as AutoCAD, but there is no mature and unified solution. In addition, some software requires the development of complex non-visual programs to solve the calculations. The process involves many steps and a large amount of data. If you are not careful, the data will be inaccurate and the cause will be difficult to find. Therefore, it is difficult for non-professionals to handle this task. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method, device and medium for processing the comprehensive characteristic curve of a water turbine model. It can easily process the characteristic curve in image form provided by the water turbine manufacturer, which facilitates the subsequent extension of the characteristic curve and conversion into a three-dimensional relationship of flow / torque, and can be used for accurate calculation, modeling and simulation of hydropower stations.

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0007] In a first aspect, the present invention provides a method for processing the comprehensive characteristic curve of a water turbine model, comprising:

[0008] Obtain the power plant unit parameters and model integrated characteristic curves, calculate the rated unit parameters based on the power plant unit parameters, and confirm the applicability of the unit and model integrated characteristic curves based on the rated unit parameters;

[0009] After confirming the applicability of the integrated characteristic curves of the unit and the model, a rectangular coordinate system for the integrated characteristic curve diagram of the model is established, and data is extracted from the integrated characteristic curve diagram of the model using the non-orthogonal network discrete point extraction method.

[0010] Copy the extracted data into an Excel spreadsheet, and use the Excel spreadsheet for batch processing to obtain the flow-torque data table of the water turbine.

[0011] Furthermore, the process of obtaining the power plant unit parameters and model integrated characteristic curves, calculating the rated unit parameters based on the power plant unit parameters, and confirming the applicability of the unit and model integrated characteristic curves based on the rated unit parameters includes:

[0012] Obtain the power plant unit parameters, including the runner diameter, rated head, and rated flow rate;

[0013] Calculate the rated unit flow rate based on the wheel diameter, rated head, and rated flow rate.

[0014] Plot the points on the model's integrated characteristic curve to confirm the applicability of the unit and the model's integrated characteristic curve.

[0015] Furthermore, the establishment of the rectangular coordinate system for the model's comprehensive characteristic curve includes:

[0016] Convert the image format of the model's comprehensive characteristic curve to a .jpg extension format;

[0017] Import the model's comprehensive characteristic curve into the GetDateGraphDigitizer software, and establish a Cartesian coordinate system based on the image, where the horizontal axis represents the rated unit flow rate and the vertical axis represents the head.

[0018] Furthermore, the extraction of data from the model's comprehensive characteristic curve using the non-orthogonal network discrete point extraction method includes:

[0019] The non-orthogonal network discrete point extraction method is selected. The intersection points of different equal opening lines and different heads are selected from the interface of the model comprehensive characteristic curve. The efficiency value is read according to the isoefficiency line, and the head and rated unit flow rate are extracted at the same time.

[0020] Furthermore, the step of copying the extracted data into an Excel spreadsheet and performing batch processing using the Excel spreadsheet to obtain a flow-torque data table for the water turbine includes:

[0021] Copy the extracted data to an Excel spreadsheet;

[0022] Calculate the torque using the head, rated unit flow rate, and efficiency value;

[0023] Batch processing using Excel spreadsheets yields a flow-torque data table for the water turbine, which includes head-flow-opening and head-torque-opening data tables.

[0024] Furthermore, select head-flow-opening and head-torque-opening data for plot verification. After confirming that the data is correct, extend and save the characteristic curves.

[0025] Secondly, the present invention provides a processing device for the comprehensive characteristic curve of a water turbine model, comprising:

[0026] The curve plotting module is used to obtain the power plant unit parameters and the model's comprehensive characteristic curves, calculate the rated unit parameters based on the power plant unit parameters, and confirm the applicability of the unit and model's comprehensive characteristic curves based on the rated unit parameters.

[0027] The data extraction module is used to establish a rectangular coordinate system for the model's integrated characteristic curve after confirming the applicability of the integrated characteristic curve of the unit and the model, and to extract data from the model's integrated characteristic curve by using the non-orthogonal network discrete point extraction method.

[0028] The batch processing module is used to copy the extracted data into an Excel spreadsheet, and then use the Excel spreadsheet to perform batch processing to obtain the flow-torque data table of the water turbine.

[0029] Thirdly, the present invention provides an electronic device, including a processor and a storage medium;

[0030] The storage medium is used to store instructions;

[0031] The processor is configured to operate according to the instructions to perform the steps of the method according to any of the preceding claims.

[0032] Fourthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the preceding methods.

[0033] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0034] 1. This invention provides a method, device, and medium for processing the comprehensive characteristic curve of a hydro turbine model. By comparing the unit parameters of the power station to be determined with the head of existing power station cases, the appropriate hydro turbine characteristics are initially determined. Then, a coordinate system is accurately established to read the flow characteristics and the corresponding efficiency. The torque and flow characteristics are further calculated. This patent can easily process the characteristic curves in image form provided by the hydro turbine manufacturer, which is convenient for the subsequent extension of the characteristic curves and conversion into a three-dimensional relationship of flow / torque. It can then be used for accurate calculation, modeling, and simulation of hydropower stations.

[0035] 2. This invention addresses the efficiency and reliability requirements of current design institutes and manufacturers for processing the comprehensive characteristic curves of hydroelectric turbine models. It utilizes a software-based, semi-automatic method to read and easily store curve data. Compared to the purely manual reading methods still used by some design institutes, this invention is fast, efficient, and the data is easily saved. It significantly saves manpower and resources, and shortens time during the early survey phase of hydroelectric power stations. Compared to professional software such as AutoCAD used by most design institutes and manufacturers, this invention is simple to operate, easy to learn, and can be reliably processed even by non-professionals. Attached Figure Description

[0036] Figure 1 This is a flowchart of a method for processing the comprehensive characteristic curve of a water turbine model provided in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the software automatically reading point data provided in an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the original head-flow-opening data provided in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the original data image of head-torque-opening degree provided in an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the extended characteristic data storage provided in an embodiment of the present invention. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0042] Example 1

[0043] This embodiment introduces a method for processing the comprehensive characteristic curve of a water turbine model, including:

[0044] Obtain the power plant unit parameters and model integrated characteristic curves, calculate the rated unit parameters based on the power plant unit parameters, and confirm the applicability of the unit and model integrated characteristic curves based on the rated unit parameters;

[0045] After confirming the applicability of the integrated characteristic curves of the unit and the model, a rectangular coordinate system for the integrated characteristic curve diagram of the model is established, and data is extracted from the integrated characteristic curve diagram of the model using the non-orthogonal network discrete point extraction method.

[0046] Copy the extracted data into an Excel spreadsheet, and use the Excel spreadsheet for batch processing to obtain the flow-torque data table of the water turbine.

[0047] like Figure 1 As shown in the figure, the method for processing the comprehensive characteristic curve of the turbine model provided in this embodiment involves the following steps in its application process:

[0048] Step 1: Determine the applicability of the characteristic curve

[0049] The provided model's comprehensive characteristic curve typically has the following axes: x and y. The coordinate system also includes iso-efficiency lines and iso-aperture lines. The rated unit flow rate is calculated using the turbine parameters of the power station to be calculated, namely the runner diameter, rated head, and rated flow rate. This point is then initially plotted on the model's comprehensive characteristic curve to determine if the turbine's rated operating point is within the high-efficiency operating region of the characteristic curve.

[0050] Step 2: GetDate software semi-automatically extracts data

[0051] Convert the model's comprehensive characteristic curve image to a .jpg extension, open GetDateGraphDigitizer, import the image, first establish a Cartesian coordinate system based on the image, then select the non-orthogonal network discrete point extraction method. On the interface, select the intersection points of different equal-aperture lines and different heads, and simultaneously read the efficiency values ​​based on the iso-efficiency lines. The efficiency is an estimate, but because the efficiency lines are relatively dense, the estimation accuracy is high. At this point, the right side of the software will display the horizontal and vertical coordinates of the points (unit flow rate and head), such as... Figure 2 As shown.

[0052] Step 3: Create a unit flow rate-unit torque lattice file

[0053] The data read from the characteristic curves is copied to an Excel spreadsheet for processing. The torque can be calculated using the head, flow rate, and efficiency data obtained from the curves. This data is then processed in batches using Excel's formula function. Finally, tables of head-flow rate-opening and head-torque-opening data for the turbine are obtained.

[0054] Step 4: Verification and extended storage of raw characteristic curve data

[0055] Because the data points are extracted using a semi-automatic process, errors may occur in the manual steps, resulting in the data table. Figure 5 Next, it is necessary to select the head-flow-opening and head-torque-opening data for graphing and verification. Smooth and continuous curves ensure the accuracy of the data, such as... Figure 3 and Figure 4 As shown. After verifying the data, the characteristic curve is extended and saved. The data is saved in .dat file format, which is small in size and easy to read, such as... Figure 5 As shown, taking this as an example, the data contained from top to bottom are as follows: 19 guide vane openings, 19 heads, unit flow rate lattice data (19×19), unit torque lattice data (19×19), guide vane opening-stroke relationship array, and runner D2 / D1; the data is simple to save and has a small size, containing key information about the turbine for later use.

[0056] This invention addresses the efficiency and reliability requirements of current design institutes and manufacturers for processing the comprehensive characteristic curves of hydraulic turbine models. It utilizes a software-based, semi-automatic method to read and easily store curve data. This invention offers the following advantages:

[0057] (1) Compared with the purely manual reading method still used by some design institutes, the present invention is fast, efficient, and the data is easy to save. It can greatly save manpower and resources and shorten the time in the early survey stage of hydropower stations.

[0058] (2) Compared with the professional software such as AutoCAD used by most design institutes or manufacturers, the operation method of this invention is simple, easy to learn, and can be reliably handled by non-professionals.

[0059] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for processing the comprehensive characteristic curve of a water turbine model, characterized in that, include: Obtain the power plant unit parameters and model integrated characteristic curves, calculate the rated unit parameters based on the power plant unit parameters, and confirm the applicability of the unit and model integrated characteristic curves based on the rated unit parameters; After confirming the applicability of the integrated characteristic curves of the unit and the model, a rectangular coordinate system for the integrated characteristic curve diagram of the model is established, and data is extracted from the integrated characteristic curve diagram of the model using the non-orthogonal network discrete point extraction method. Copy the extracted data into an Excel spreadsheet, and use the Excel spreadsheet for batch processing to obtain the flow-torque data table of the water turbine; The rectangular coordinate system used to establish the comprehensive characteristic curve of the model includes: Convert the image format of the model's comprehensive characteristic curve to a .jpg extension format; Import the model's comprehensive characteristic curve into the GetDate Graph Digitizer software, and establish a rectangular coordinate system based on the image, where the horizontal axis represents the rated unit flow rate and the vertical axis represents the head. The method of extracting data from the model's comprehensive characteristic curve using discrete points extracted via non-orthogonal networks includes: The non-orthogonal network discrete point extraction method is selected. The intersection points of different equal opening lines and different heads are selected from the interface of the model comprehensive characteristic curve. The efficiency value is read according to the isoefficiency line, and the head and rated unit flow rate are extracted at the same time. The step of copying the extracted data into an Excel spreadsheet and performing batch processing using the Excel spreadsheet to obtain a flow-torque data table for the water turbine includes: Copy the extracted data to an Excel spreadsheet; Calculate the torque using the head, rated unit flow rate, and efficiency value; Batch processing using Excel spreadsheets yields a flow-torque data table for the water turbine, which includes head-flow-opening and head-torque-opening data tables.

2. The method for processing the comprehensive characteristic curve of a turbine model according to claim 1, characterized in that, The process of obtaining power plant unit parameters and model integrated characteristic curves, calculating the rated unit parameters based on the power plant unit parameters, and confirming the applicability of the unit and model integrated characteristic curves based on the rated unit parameters includes: Obtain the power plant unit parameters, including the runner diameter, rated head, and rated flow rate; Calculate the rated unit flow rate based on the wheel diameter, rated head, and rated flow rate. Plot the points on the model's integrated characteristic curve to confirm the applicability of the unit to the model's integrated characteristic curve.

3. The method for processing the comprehensive characteristic curve of a turbine model according to claim 1, characterized in that, Select head-flow-opening and head-torque-opening data for plot verification. After confirming that the data is correct, extend and save the characteristic curves.

4. An electronic device, characterized in that: Including processor and storage media; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 1 to 3.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that: When executed by a processor, the program implements the steps of the method according to any one of claims 1 to 3.

Images