Method for constructing digital model of generator stator winding
By constructing a digital model of the generator stator winding, the problem of multi-dimensional information fusion was solved, digital diagnosis and fault analysis of the stator winding were realized, and the reliability and automation level of the diagnosis were improved.
Patent Information
- Application Number
- CN202510696751.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-28
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2045-05-28
AI Technical Summary
Existing technologies find it difficult to effectively integrate the multi-dimensional information of large generator stator windings, resulting in inaccurate insulation risk assessment and inability to achieve digital diagnosis and fault analysis of stator windings.
Construct a digital model of the generator stator winding by obtaining the stator technical parameters and structural information, establish a coordinate system, obtain fixed insulation components and connection parameters, draw a dynamic winding model, and realize the integrated display of multi-dimensional information.
It improves the dimensionality of generator status data and the reliability of analysis and diagnosis, and promotes the digitization and automation of stator winding inspection and fault analysis.
Smart Images
Figure CN120217596B_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of generator operation, maintenance, analysis and diagnosis, and in particular to a method for constructing a digital model of a generator stator winding. Background Art
[0002] Inspection of insulation components in large generator stator windings is a crucial countermeasure for energy companies, preventing unplanned equipment downtime and major electrical accidents. Large generator windings are complex, with numerous insulation components and overlapping spaces between layers, phases, and branches. This makes timely understanding the voltage distribution within the winding's spatial structure challenging. Currently, multi-dimensional information fusion analysis, including stator winding electrical parameters, spatial structural parameters, test data, and inspection information, is not feasible. Operational risk assessment relies solely on empirical assessment of the appearance, morphology, and color of insulation components, resulting in low reliability and occasional insulation-related downtime.
[0003] Furthermore, inspection photos and UV imaging images typically only record the slot number, failing to reflect the specific spatial position of the insulation components within the windings or their electrical information. These images are also semi-structured, leading to misjudgments during subsequent analysis and diagnosis. With the deepening of digitalization in the power industry, the digitization of key operations, maintenance, and testing processes within generators, core equipment in power systems, is imperative. Summary of the Invention
[0004] This application proposes a method for constructing a digital model of a generator stator winding, aiming to at least partially address one of the technical problems in the related art. The technical solution of this application is as follows:
[0005] The present application embodiment proposes a method for constructing a digital model of a generator stator winding, including:
[0006] Obtain stator technical parameters of generator stator winding;
[0007] Combining the stator technical parameters and the structural information of the stator winding, obtaining fixed insulation component parameters and connection parameters of the stator winding;
[0008] Based on the structural information of the stator winding, a coordinate system of the stator winding is established; and according to the stator technical parameters and the parameters and connection parameters of the fixed insulating component of the stator winding, a plurality of key positions of the stator winding and a coordinate representation of the fixed insulating component based on the coordinate system are obtained;
[0009] Based on the stator technical parameters and the coordinate representation, obtaining a plurality of electrical parameters of the stator winding, a plurality of key positions of the stator winding, and position coordinates of the fixed insulating component;
[0010] Based on the coordinate system, a dynamic winding model is drawn and displayed in combination with the structural information of the stator winding, the position coordinates of the multiple key positions and the fixed insulation component, and the multiple electrical parameters.
[0011] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:
[0012] In this technical solution, the stator technical parameters of the generator stator winding are obtained, and the fixed insulation component parameters and connection parameters of the stator winding are obtained in combination with the structural information of the stator winding; a coordinate system of the stator winding is established, and based on the obtained parameters, the coordinate representations of multiple key positions of the stator winding and the fixed insulation components are obtained; based on the coordinate system and the coordinate representation, multiple electrical parameters of the stator winding and the position coordinates of multiple key positions of the stator winding and the fixed insulation components are obtained, and a dynamic winding model is drawn and displayed according to the position coordinates; thus, this solution realizes the construction of a digital winding model by obtaining the structural information, spatial position information and electrical information of the generator stator winding, and drawing a dynamic winding diagram based on the information. Based on this model, multi-dimensional information can be integrated and can be used for inspection, testing, fault analysis and diagnosis of the stator winding, thereby improving the dimension and quality of the generator status data, improving the digitalization level of stator analysis and diagnosis, improving the digitalization level of the operation process, analyzing and diagnosing reliability, and promoting the automation of complex operation processes in professional fields.
[0013] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:
[0015] Figure 1 A schematic flow chart of a method for constructing a digital model of a generator stator winding provided in an embodiment of the present application;
[0016] Figure 2 A schematic diagram of the location of a unit pitch winding and components provided for an example of this application;
[0017] Figure 3 The U1 branch connection diagram provided for this application example;
[0018] Figure 4 The upper schematic diagram of the winding structure and parameters of a certain unit pitch provided as an example of this application;
[0019] Figure 5 The lower schematic diagram of the winding structure and parameters of a certain unit pitch provided in the example of this application;
[0020] Figure 6 Schematic diagram of the wire rod and coordinate parameters provided for the example of this application;
[0021] Figure 7 A real-time digitized unit pitch winding schematic diagram provided for the example of this application;
[0022] Figure 8 A schematic diagram of a unit pitch winding with real-time digitization of integrated electrical parameters provided in an example of this application;
[0023] Figure 9 This is a schematic diagram of the voltage distribution of a branch winding and components provided in the example of this application. DETAILED DESCRIPTION
[0024] The embodiments of the present application are described in detail below. Examples of the embodiments 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 application, and are not to be construed as limiting the present application. If no specific techniques or conditions are specified in the embodiments, the techniques or conditions described in the literature in this field or the product specifications shall be followed. If the materials or equipment used do not indicate the manufacturer, they are all conventional products that can be purchased.
[0025] The following describes the method, device and equipment for constructing a digital model of a generator stator winding according to an embodiment of the present application with reference to the accompanying drawings.
[0026] Figure 1 This is a flow chart of a method for constructing a digital model of a generator stator winding provided in an embodiment of the present application. Figure 1 As shown, the method for constructing the digital model of the generator stator winding includes the following steps:
[0027] Step S101, obtaining stator technical parameters of the generator stator winding.
[0028] As an implementation method, the stator technical parameters of the generator stator winding are obtained according to the generator stator winding connection diagram.
[0029] In some embodiments, the stator technical parameters include stator rated voltage UN, number of stator slots Z, winding pitch Y: Y1-Y2-Y3, number of branches a, number of stator core segments LT, and winding type, wherein the winding type includes R-wave winding and stacked winding.
[0030] Example 1: From the stator winding connection diagram of a large generator, we obtain the following: stator rated voltage 18 kV, number of stator slots 576, winding pitch Y: 1-11-25, number of stator branches 8, winding type wave winding, and number of core segments axially divided into 8 sections. The technical parameters of the generator stator are as follows: UN = 18000, Z = 576, Y: Y1 = 1, Y2 = 11, Y3 = 25, a = 8, LT = 8, R: wave winding.
[0031] Step S102 : Acquire fixed insulation component parameters and connection parameters of the stator winding in combination with stator technical parameters and structural information of the stator winding.
[0032] As an implementation method, based on the stator technical parameters, the stator slots of the stator winding are numbered to obtain the slot number of each stator slot; based on the structural information of the stator winding, the fixed insulation component parameters of the stator winding are obtained; based on the slot number, the connection parameters of the stator winding are obtained according to the structural information of the stator winding; wherein, the fixed insulation component parameters include the number and position of the slot spacers, the number and position of the bevel spacers, and the number and position of the end hoops; the connection parameters include the branch name of each stator branch, the slot number of the wire rod in the branch, and the wire rod connection sequence number.
[0033] Let's continue with Example 1. Figure 2 The figure shows the location of a unit pitch winding and components, combined with Figure 2 An example is given to illustrate this step.
[0034] Figure 2 The figure shows the position diagram of the upper and lower layer wire rods of the unit pitch centered on n. Figure 2 The dashed lines represent the lower-layer bars for this unit pitch, and the solid lines represent the upper-layer bars. The three upper-layer bars correspond to slots n-1, n, and n+1 in the diagram, respectively. Therefore, the three upper-layer bars are also referred to as upper-layer bar n-1, upper-layer bar n, and upper-layer bar n+1. Each lower-layer bar pitch plus one slot corresponds to slot n-L1, slot n, and then slot n+L2. The bars corresponding to slots n-L1, n, and n+L2 are interconnected within the same branch. In the diagram, the bars corresponding to the lower-layer n-L1 and upper-layer n are connected and span L1, or Y3-Y2 slots. The upper-layer bars and lower-layer bars corresponding to slot n in the upper-layer form L1 interlayer intersections. These L1 interlayer intersections are numbered 1, 2, 3, ..., L1, extending from the core along the bars. The wire bars corresponding to the upper layer n and the lower layer n+L2 are connected and span L2, i.e., Y2-Y1 slots. The upper layer wire bars and the lower layer wire bars corresponding to the upper layer n slots constitute L2 inter-layer intersections. The serial numbers of the L2 inter-layer intersections extending outward along the wire bars from the iron core are 1, 2, 3...L2.
[0035] 1) Figure 2A bevel gap is formed between the middle and upper layer bars n-1 and n at the upper end, in which a slotted spacer for fixing the winding is installed. Figure 2 Medium rectangle, number N_ckus, position Ckus; the beveled spacer for fixing the winding is installed in this gap, see Figure 2 Middle diamond, number N_xus, location Xus;
[0036] 2) Figure 2 A bevel gap is formed at the lower end between the middle and upper layer wire bars n-1 and n, in which a slotted spacer for fixing the winding is installed. Figure 2 The number of the middle rectangle is N_ckds and the position is Ckds. The bevel pads for fixing the winding are installed in this gap. See the diamond in the figure. The number is N_xds and the position is Xds.
[0037] 3) Figure 2 A bevel gap is formed at the upper end between the middle and lower layer wire bars n-1 and n, in which a slotted spacer for fixing the winding is installed. Figure 2 The number of the medium rectangle is N_ckux and the position is Ckux. The beveled spacers for fixing the winding are installed in the gap. Figure 2 Middle rhombus, number N_xux, position Xux;
[0038] 4) Figure 2 A bevel gap is formed at the lower end between the middle and lower layer wire bars n-1 and n, in which a slotted spacer for fixing the winding is installed. Figure 2 The number of the middle rectangle is N_ckdx and the position is Ckdx. The bevel pads for fixing the winding are installed in the gap. Figure 2 Middle rhombus, number N_xdx, position Xdx;
[0039] 5) Figure 2 The interlayer end hoops installed between the middle and upper layers of wire rods are shown as solid parallelograms spanning wire rods n-1, n, and n+1. The number of upper end hoops is N_dum and the position is Dum. The number of lower end hoops is N_ddm and the position is Ddm.
[0040] 6) Figure 2 The middle and lower layer wire rod end hoops, as shown by the dotted parallelogram spanning the lower layer n-1, n, and n+1 wire rods, have N_dux upper end hoops in number and Dux in position, and N_ddx lower end hoops in number and Ddx in position.
[0041] Due to the differences between the upper and lower layers and the upper and lower ends of the winding, parameters are defined separately. That is, the parameters of the fixed insulating components are defined for different locations in the upper and lower layers and at the upper and lower ends of the stator winding structure. Specifically, regardless of the upper or lower end, the serial numbers of various components and key points are marked as 1 (or serial number 1), 2, 3, and so on, extending outward from the stator core along the length of the bars. For example, if there are two slotted blocks between lower-layer bars n-1 and n, the serial numbers of these two slotted blocks are serial numbers 1 and 2, respectively. The serial numbers of the 10 intersections of the upper and lower layers of bars (i.e., interlayer intersections) are marked as 1, 2, ..., 10, extending outward from the stator core along the length of the bars. The number of slotted blocks, beveled blocks, and end hoops between two adjacent bars is counted as the number of these components. For example, if there are two slotted blocks between lower-layer bars n-1 and n, the number of slotted blocks between lower-layer bars n-1 and n is counted as 2. The spatial position of each fixed insulating component is recorded using the numerical value of the intersection of the upper and lower layer bars (i.e., the intersection between layers) as a scale, for example, Figure 2 The 1-L2 shown is the serial number of the interlayer intersection. The serial number of the interlayer intersection corresponding to the interlayer end hoop with serial number 1 is 5. Therefore, the position of the interlayer end hoop with serial number 1 is 5, and the position of the interlayer end hoop with serial number 2 is 8. The position of the notch pad with serial number 1 is 0, the position of the bevel pad with serial number 1 is 3, and the position of the bevel pad with serial number 2 is 7. The parameters of the winding fixed insulation components are recorded in the following Table 1. The position parameter examples in Table 1 are the serial numbers of the interlayer intersections.
[0042] Table 1: Parameters of winding fixed insulation components
[0043]
[0044] Next, continue with Figure 2 Taking the structure shown in the figure as an example, how to obtain the winding connection parameters is described in detail.
[0045] As an implementation method, the connection information is obtained based on the branch unit, including the branch name, the slot number of the wire rod in the branch, and the wire rod connection sequence number. Among them, the branch name is defined as U1, U2, ....Un, V1, V2, ....Vn, W1, W2, ....Wn, where n is the number of branches a; the wire rod connection sequence number is 1, 2, 3, ... Ni from the end to the beginning of the branch, where Ni is the number of wire rods in a single branch. ; Figure 3 This is the U1 branch connection diagram, divided into upper and lower layer wire rod statistics, Figure 3 The sequence numbers 1 to 5 are the bar connection sequence numbers; the connection parameters of the branch are recorded in Table 2 below, including the bar connection sequence number and the slot number of the bar in the branch.
[0046] Table 2: Connection parameters of branch U1
[0047]
[0048] The remaining branches obtain connection parameters in the same way.
[0049] Step S103: establishing a coordinate system of the stator winding based on the structural information of the stator winding; and obtaining coordinate representations of multiple key positions of the stator winding and the fixed insulating components based on the coordinate system according to the stator technical parameters and the fixed insulating component parameters and connection parameters of the stator winding.
[0050] As an implementation method, a coordinate system of the stator winding is established. The X coordinate of the coordinate system represents the coordinates of the stator winding in ascending order of slot numbers. The Y coordinate of the coordinate system represents the vertical height coordinate of the stator winding from bottom to top. The Z coordinate of the coordinate system has a value range of [1, 2, 3, 4], which respectively represent the upper layer wire rods and fixed insulation components, interlayer fixed insulation components, lower layer wire rods and fixed insulation components, and lower layer end hoop of the stator from the inside to the outside.
[0051] For example, Figure 4 、 Figure 5 The upper and lower schematic diagrams are respectively the winding structure and parameters of the unit pitch of a generator in Example 1. Figure 4 and Figure 5 The structure and position parameters of the upper and lower layers of the bars and related components of the nth slot are shown. The winding structure corresponding to a pair of magnetic poles is a complete pitch. Figure 4 and Figure 5 Here, L1 = Y3 - Y2 represents the span of the upper winding end, and L2 = Y2 - Y1 represents the span of the lower winding end. n-L1...n-1, n, n+1, n+2...n+L2 represent the slot numbers in the upper view, and n+L1...n+1, n, n-1, n-2...n-L2 represent the slot numbers in the lower view. These numbers are used to determine the horizontal spatial position of the wire rods and are related to the X coordinate. 1, 2, 3...7, 8, 9...L1 represent the sequence numbers of the intersections of the upper and lower wire rods at the upper end, and 1, 2, 3...7...L2 represent the sequence numbers of the intersections of the upper and lower wire rods at the lower end. These sequence numbers describe the spatial position of the end winding's fixed insulation components and are related to the X and Y coordinates. LT is the length of the wire rod's straight segment, which is the number of core segments. For example, if the core consists of eight segments from bottom to top, LT = 8. This is related to the Y coordinate.
[0052] Establish the coordinate system of the stator winding. Y represents the coordinate of the vertical height of the winding from bottom to top (Y1 to Y3+LT), and X represents the coordinate of the stator winding from small to large in order of slot number.
[0053] As an implementation method, a method for obtaining coordinate representations of multiple key positions of a stator winding and fixed insulating components based on a coordinate system includes: determining the X-coordinate representation of each stator slot based on a relationship between the slot number and the X-coordinate; the value range of the X-coordinate corresponds to the slot number; determining the X-coordinate representation and the Y-coordinate representation of each unit pitch; and determining, in combination with the parameters and connection parameters of the fixed insulating components of the stator winding, the coordinate representations of each upper layer wire rod, each upper layer slot pad and bevel pad of the lower end, each position and each intersection point of the interlayer end hoops between the lower end layers, each upper layer slot pad and bevel pad of the upper end, each position and each intersection point of the interlayer end hoops between the upper end layers, each lower layer wire rod, each lower layer slot pad and bevel pad of the lower end, each position and each intersection point of the interlayer end hoops between the lower end layers, each lower layer slot pad and bevel pad, each position and each intersection point of the interlayer end hoops between the lower end layers, each lower layer slot pad and bevel pad, and each position and each intersection point of the interlayer end hoops between the upper end layers.
[0054] For example, determine the relationship between the X coordinate and the slot number, , taking the nth slot as an example , and so on for slot n+1 , the X coordinate value range corresponds to the slot number. When n=1, X1=1 is the smallest, that is, the X coordinate of slot number 1 is the smallest; when n=Z, Maximum, that is, the X coordinate of slot number Z is the largest; the above Figure 4 The X coordinate of each unit pitch is expressed as follows:
[0055]
[0056] Determine that the Y coordinate represents the spatial height position of each fixed insulating component from bottom to top, then the Y coordinate of each unit pitch is as follows:
[0057]
[0058] Based on the established coordinate system, coordinate representations of multiple bars and components are determined to locate the spatial positions of the bars and fixed insulation components. The bar height refers to the center height of the bar. In the previous step, the sequence numbers of the fixed insulation components were determined to be consistent with the sequence numbers of the interlayer intersections. To ensure accurate and unique positioning, the coordinate system's Z dimension is increased to a range of [1, 2, 3, 4]. This range represents the upper layer of bars and fixed insulation components, the interlayer fixed insulation components, the lower layer of bars and fixed insulation components, and the lower layer end clamps, from the inside to the outside of the stator.
[0059] The coordinates of the upper layer wire rod and each component are represented by parameters n, Y1, Y2, Y3, LT, Xds, Ddm, Xus, Dum, etc. Figure 4 Taking the unit shown as an example, the coordinates are expressed as follows:
[0060] 1) Upper wire rod n:
[0061] XYZ coordinates of the wire rod:
[0062] 2) Upper layer of lower end
[0063] XYZ coordinates of the right slot pad:
[0064] XYZ coordinates of the left notch pad:
[0065] XYZ coordinates of the right bevel pad:
[0066] Left bevel pad XYZ coordinates:
[0067] 3) Between the lower end layers
[0068] Upper and lower XYZ coordinates of the interlayer end hoop:
[0069] Left XYZ coordinates of the interlayer end hoop:
[0070] Right XYZ coordinates of the interlayer end hoop:
[0071] XYZ coordinates of one intersection point between winding layers:
[0072] XYZ coordinates of two intersection points between winding layers:
[0073] XYZ coordinates of the three intersection points between winding layers: .....
[0075] XYZ coordinates of the intersection point L2 between winding layers:
[0076] 4) Upper layer of the upper end
[0077] XYZ coordinates of the right slot pad:
[0078] XYZ coordinates of the left notch pad:
[0079] XYZ coordinates of the right bevel pad:
[0080] Left bevel pad XYZ coordinates:
[0081] 5) Upper end interlayer
[0082] Upper and lower XYZ coordinates of the interlayer end hoop:
[0083] Left XYZ coordinates of the interlayer end hoop:
[0084] Right XYZ coordinates of the interlayer end hoop:
[0085] XYZ coordinates of one intersection point between winding layers:
[0086] XYZ coordinates of two intersection points between winding layers:
[0087] XYZ coordinates of the three intersection points between winding layers: .....
[0089] XYZ coordinates of the intersection point L1 between winding layers:
[0090] The obtained parameters represent the coordinates of the lower layer wire rod and each component. Figure 5 The coordinates of the lower view are as follows:
[0091] Lower layer wire rod n
[0092] XYZ coordinates of the wire rod:
[0093] 2) Lower layer of the lower end
[0094] XYZ coordinates of the left notch pad:
[0095] XYZ coordinates of the right slot pad:
[0096] Left bevel pad XYZ coordinates:
[0097] XYZ coordinates of the right bevel pad:
[0098] 3) Between the lower end layers
[0099] Upper and lower XYZ coordinates of the interlayer end hoop:
[0100] Left XYZ coordinates of the interlayer end hoop:
[0101] Right XYZ coordinates of the interlayer end hoop:
[0102] XYZ coordinates of one intersection point between winding layers:
[0103] XYZ coordinates of two intersection points between winding layers:
[0104] XYZ coordinates of the three intersection points between winding layers: .....
[0106] XYZ coordinates of the intersection point L2 between winding layers:
[0107] Left XYZ coordinates of the lower end hoop:
[0108] Left XYZ coordinates of the lower end hoop:
[0109] 4) Upper end lower layer
[0110] XYZ coordinates of the left notch pad:
[0111] XYZ coordinates of the right slot pad:
[0112] Left bevel pad XYZ coordinates:
[0113] XYZ coordinates of the right bevel pad:
[0114] 5) Upper end interlayer
[0115] Upper and lower XYZ coordinates of the interlayer end hoop:
[0116] Left XYZ coordinates of the interlayer end hoop:
[0117] Right XYZ coordinates of the interlayer end hoop:
[0118] XYZ coordinates of one intersection point between winding layers:
[0119] XYZ coordinates of two intersection points between winding layers:
[0120] XYZ coordinates of the three intersection points between winding layers: .....
[0122] XYZ coordinates of the intersection point L2 between winding layers:
[0123] Left XYZ coordinates of the lower end hoop:
[0124] Left XYZ coordinates of the lower end hoop:
[0125] Thus, coordinate representations of multiple positions and components of the generator stator winding are obtained through the example method.
[0126] Step S104 : Based on the stator technical parameters and coordinate representation, a plurality of electrical parameters of the stator winding and a plurality of key positions of the stator winding and position coordinates of fixed insulating components are obtained.
[0127] As an example, based on the stator technical parameters and coordinate representation, the ground voltage and position coordinates of the wire rod are obtained; based on the ground voltage and coordinate representation of each wire rod, the slot pad voltage and position coordinates of the slot pad are obtained; based on the ground voltage and coordinate representation of each wire rod, the bevel pad voltage and position coordinates of the bevel pad are obtained; based on the ground voltage and coordinate representation of each wire rod, the interlayer intersection voltage and position coordinates of the interlayer intersection are obtained; based on the ground voltage and coordinate representation of each wire rod, the interlayer end clamp voltage and position coordinates of the interlayer end clamp are obtained.
[0128] In some embodiments, after obtaining multiple electrical parameters of the stator winding and multiple key positions of the stator winding and the position coordinates of the fixed insulating components, it includes: recording the ground voltage and position coordinates of each wire rod, the voltage and position coordinates of the bevel pads between each layer, the voltage and position coordinates between the intersections between each layer, and the interlayer end clamp voltage and position coordinates of the interlayer end clamp in the form of a dictionary.
[0129] The acquisition of various electrical parameters is described in detail below.
[0130] Step 1: Calculate the voltage of each wire rod to ground and the coordinates of each wire rod.
[0131] (1) Taking the calculation of the voltage to ground of the n-th slot bar as an example, the connection parameters in Table 2 are used to determine the end (D\U), layer (S\X), slot (n), phase (A\B\C), branch (U1, U2...V1, V2...W1, W2...), and bar connection sequence number k of the n-th slot bar. The voltage to ground V_s_n and the coordinates XYZ of the n-th slot bar are calculated using the following formula:
[0132]
[0133] (2) Record the obtained voltage to ground and other parameters of each wire rod in the form of a dictionary.
[0134] For example, the calculated and recorded results of the ground voltage of the bar in the 100th slot on the upper layer of a generator are as follows:
[0135] {'End': 'U', 'Layer': 'S', 'Slot': 100, 'Phase': 'A', 'Branch': 'U4', 'Serial Number': 32, 'Voltage to Ground': 6928}
[0136] (3) According to the above method, the voltage to ground and the position coordinates of the upper layer n-1, n, n+1 and the lower layer n-L1..., n-1, n, n+1...n+L2 bars can be calculated in sequence. The voltage to ground and the position coordinate parameters of the upper and lower layer bars with the unit pitch centered on n are listed. The calculation results of the unit pitch centered on the 100th slot (i.e., n=100) of the upper layer of a generator are as follows:
[0137] Slot number: [99, 100, 101, 100, 99, 98, 97, 96, 95, 94, 93, 92, 91, 90, 89,88, 87]
[0138] For example, the following are the recorded results:
[0139] {'Name': 'S-bar', 'End': 'U', 'Layer': 'S', 'Slot': 99, 'Phase': 'A', 'Branch': 'U5', 'Serial Number': 26, 'Ground Voltage': 5629, 'Coordinates': [197, 17, 1]};
[0140] {'Name': 'S-bar', 'End': 'U', 'Layer': 'S', 'Slot': 100, 'Phase': 'A', 'Branch': 'U4', 'Serial Number': 32, 'Ground Voltage': 6928, 'Coordinates': [199, 17, 1]}; ....;
[0142] {'Name': 'X-ray Rod', 'End': 'U', 'Layer': 'X', 'Slot': 88, 'Phase': 'C', 'Branch': 'W5', 'Serial Number': 41, 'Voltage to Ground': 8660, 'Coordinates': [175, 16, 3]};
[0143] {'Name': 'X-Bar', 'End': 'U', 'Layer': 'X', 'Slot': 87, 'Phase': 'C', 'Branch': 'W6', 'Serial Number': 47, 'Voltage to Ground': 9959, 'Coordinates': [173, 16, 3]}.
[0144] Step 2: Calculate the voltage V_CK of each slot pad (i.e., the voltage between the slot bars corresponding to the slot pad) and the position information.
[0145] The following description will be made by taking the calculation of the slot block voltage V_CK and position coordinates XYZ between n-1 and n as an example.
[0146] Based on the obtained voltage V_s_n and phase of the bars in the upper layer n-1 and n slots to the ground, the slot block voltage V_CK is calculated using the following formula:
[0147]
[0148] For example, the calculation results of the slot spacer voltage of a unit pitch centered at slots 99 and 100 on the upper layer of a generator are recorded as follows:
[0149] {'Name': 'Notch Spacer', 'Serial Number': 1, 'End': 'U', 'Layer': 'S', 'Slot Number': '99-100', 'Voltage Between Notch Bars': ['UAA', 10894], 'Phase Relationship': 'In-Phase', 'Branch Relationship': 'U5U4', 'Coordinates': [198, 18, 1]}.
[0150] Step 3: Calculate the voltage V_XB of each bevel pad (i.e., the voltage between the bevel bars corresponding to the bevel pad) and the position information.
[0151] The following is an example of calculating the voltage V_XB and position coordinates XYZ of the oblique edge pad between n-1 and n.
[0152] 1) Based on the voltage V_s_n and phase of the bars in the upper layer n-1 and n slots, the following parameters and formulas are used for calculation:
[0153]
[0154] According to the above formula, when there are multiple bevel pads, the position parameter Xus or Xds of the bevel pad can be replaced and the calculation can be repeated.
[0155] For example, the calculation results of the pitch unit centered at the 99th and 100th slots on the upper layer of a generator are recorded as follows:
[0156] {'Name': 'Hypotenuse Spacer', 'Serial Number': 1, 'End': 'U', 'Layer': 'S', 'Slot Number': '99-100', 'Hypotenuse Bar Voltage': ['UAA', 10894], 'Phase Relationship': 'In-Phase', 'Branch Relationship': 'U5U4', 'Coordinates': [194, 23, 1]}
[0157] Step 4: Calculate the voltage V_SX at the interlayer intersection of the wire rods (i.e., the voltage between the upper and lower layers corresponding to the interlayer gap to which the interlayer intersection belongs).
[0158] The following is an example of calculating the voltage V_SX and coordinates XYZ between the inter-layer intersections between the n and lower layer n-L1..., n-1, n, n+1....n+L2 bars.
[0159] Based on the obtained voltages V_s_n and V_s_n of the bars in the upper and lower n slots to the ground, the following parameters and formula are used to calculate the voltage at the first inter-layer intersection:
[0160]
[0161]
[0162] 2) Modify the lower slot to n-1, , calculate the voltages at the two interlayer intersections at the upper end of the winding, and sequentially substitute the coordinates of the interlayer intersections between slots n-2, n-3, ... n-L1 and the corresponding interlayer intersections in the above steps to calculate the voltages at the other interlayer intersections at the upper end;
[0163] 3) Modify the lower slot to n+1, , calculate the voltages at the two interlayer intersections at the lower end of the winding, and sequentially substitute slots n+2, n+3...n+L2 and the corresponding interlayer coordinates of the winding in the above steps to calculate the voltages at the other interlayer intersections at the lower end;
[0164] For example, the voltage and position coordinate calculation results of the interlayer intersection points 1 and 2 between the upper layer 100 slot and the lower layer bar at the upper end of a generator are recorded as follows:
[0165] {'Name': 'Interlayer Gap', 'Serial Number': 1, 'End': 'U', 'Layer': 'SX', 'Slot Number': '100-100', 'Upper and Lower Layer Voltage': ['UAC', 8529], 'Phase Relationship': 'Out of Phase', 'Branch Relationship': 'U4W4', 'Coordinates': [199, 19, 2]},
[0166] {'Name': 'Interlayer Gap', 'Serial Number': 2, 'End': 'U', 'Layer': 'SX', 'Slot Number': '100-99', 'Upper and Lower Layer Voltage': ['UAC', 7660], 'Phase Relationship': 'Out of Phase', 'Branch Relationship': 'U4W5', 'Coordinates': [198, 20, 2]}.
[0167] Step 5: Calculate the interlayer end clamp voltage V_DM (i.e., the voltage between the upper and lower layers of the end clamp) and its position coordinates.
[0168] The following takes the calculation of the interlayer clamp voltage V_DM and position coordinates XYZ between the upper layer n and the lower layer as an example.
[0169] 1) In Table 1, the position of the upper end interlayer end clamp is Dum. Based on the voltage V_s_n and phase of the bars in the upper layer n slot and the lower layer n-Dum slot to ground obtained in the above steps, the interlayer end clamp voltage is calculated using the following parameters and formula:
[0170]
[0171]
[0172] For the case where there are two or more upper end hoops, replace the corresponding position parameter Dum and apply the above formula for calculation respectively.
[0173] 2) In Table 1, the position of the lower end interlayer end clamp is Ddm. Based on the above steps to obtain the voltage V_s_n and phase of the bar to ground of the upper layer n slot and the lower layer n+Ddm slot, the following parameters and formula are used to calculate the interlayer end clamp voltage and coordinates XYZ:
[0174]
[0175] In the case where there are more lower end hoops, the corresponding position parameters Ddm can be taken and calculated separately using the above formula.
[0176] For example, the calculation results of the upper and lower end hoops of the 100th slot wire rod in the upper layer of the two end hoops at the upper end of a generator are recorded as follows:
[0177] {'Name': 'Interlayer end clamp', 'Serial number': 1, 'End': 'U', 'Slot number': '99-100', 'Phase relationship': 'In phase', 'Branch relationship': 'U5U4', 'Coordinates': [192, 25, 2], 'Voltage between upper and lower layers of end clamp': ['UAB', 11999]},
[0178] {'Name': 'Interlayer end clamp', 'Serial number': 2, 'End': 'U', 'Slot number': '99-100', 'Phase relationship': 'In phase', 'Branch relationship': 'U5U4', 'Coordinates': [187, 30, 2], 'Voltage between upper and lower layers of the end clamp': ['UAC', 9496]}.
[0179] Step S105 : Based on the coordinate system, the dynamic winding model is drawn and displayed in combination with the structural information of the stator winding, the position coordinates of multiple key positions and fixed insulating components, and multiple electrical parameters.
[0180] As an example, the dynamic winding model includes any wire-bar diagram and a multi-wire-bar combination diagram, and the multi-wire-bar combination diagram includes a unit pitch winding diagram, a branch winding diagram, and a phase winding diagram.
[0181] This embodiment can establish the parameters of a single wire bar and, based on the coordinate system of the stator winding, realize the drawing of any wire bar diagram and the drawing of multi-wire bar combination diagram through parameter control, including unit pitch winding diagram, branch winding diagram, phase winding diagram, etc.
[0182] 1) Figure 6 The diagram shows the upper and lower layers of the n-th slot, along with their coordinate parameters. Y1, Y2, and Y3 represent the winding pitch parameters, and LT represents the number of core segments. The upper layer of the bar is formed by connecting four points (S1, S2, S3, and S4) with line segments. Their two-dimensional coordinates are S1 (2n-1-(Y3-Y2), Y3+LT), S2 (2n-1, Y2+LT), S3 (2n-1, Y2), and S4 (2n-1+(Y2-Y1), Y1). The lower layer of the bar is formed by connecting four points (X1, X2, X3, and X4) with line segments. Their two-dimensional coordinates are X1 (2n-1+(Y3-Y2), Y3+LT), X2 (2n-1, Y2+LT), X3 (2n-1, Y2), and X4 (2n-1-(Y2-Y1), Y1).
[0183] 2) Use the upper-layer coordinate parameters in 1) as control parameters for drawing the upper-layer wire rods of the nth slot, and the lower-layer coordinate parameters as control parameters for drawing the lower-layer wire rods of the nth slot. Control the drawing of the wire rods in any slot using the slot number and coordinate parameters. Determine the branch where the wire rod is located based on the slot number and layer through the connection parameter table obtained. If it is a phase A branch, it is drawn in yellow, if it is a phase B branch, it is drawn in green, and if it is a phase C branch, it is drawn in red. The specific drawing is completed by computer code, and the above are the control parameters.
[0184] 3) Draw the unit pitch winding centered on the nth slot using the slot numbers n-1, n, n+1 on the upper layer and n-L1..., n-1, n, n+1...n+L2 on the lower layer for inspection. Take a generator with Y1=1, Y2=11, Y3=25 and the 20th slot on the upper layer as an example to draw a real-time digital unit pitch winding diagram for inspection, as shown in the figure below: Figure 7 shown.
[0185] 4) Using the connection parameter table obtained in the previous step, input a complete branch slot number to draw a winding connection diagram for the complete branch for winding connection analysis.
[0186] As an example, the corresponding electrical parameters are displayed synchronously based on the coordinate position of the dynamic winding model. That is, when displaying the winding diagram, the acquired electrical parameters can be integrated with the position parameters, and the relevant electrical parameters calculated in the previous steps can be displayed synchronously according to the coordinate position, thus achieving a multi-dimensional information fusion display.
[0187] In some embodiments, winding electrical parameters can be searched and displayed conditionally. For example, plotting a partial winding by unit pitch can reveal high-voltage areas within the winding structure, guiding maintenance and inspection operations and enabling precise troubleshooting of high-risk areas. When plotting a complete branch or phase winding, voltage can be visually displayed within the winding structure, providing a clear overview of the winding's spatial voltage distribution and enabling timely identification of winding design deficiencies.
[0188] The application corresponding to the above method is implanted into a portable terminal for on-site stator winding maintenance operations. The operation information pictures and voice are recorded and stored in association with the spatial coordinate position, thereby realizing multi-source information fusion of the stator winding's spatial position information, electrical information, and inspection information, and realizing the digitization of maintenance and inspection operations.
[0189] It should be noted that the present invention describes in detail the process of constructing a digital model of the generator stator winding. This method is applicable to generators with different parameters. The examples of the present invention are all explained using wave winding parameters. This method is also applicable to stacked windings, which can be achieved by modifying the coordinates in this step.
[0190] The method for constructing a digital model of a generator stator winding in an embodiment of the present application obtains the stator technical parameters of the generator stator winding, and obtains the fixed insulation component parameters and connection parameters of the stator winding in combination with the structural information of the stator winding; establishes a coordinate system for the stator winding, and obtains the coordinate representation of multiple key positions of the stator winding and the fixed insulation component based on the obtained parameters; based on the coordinate system and the coordinate representation, obtains multiple electrical parameters of the stator winding and the position coordinates of multiple key positions of the stator winding and the fixed insulation component, and draws and displays a dynamic winding model based on the position coordinates; thus, this solution obtains the structural information, spatial position information and electrical information of the generator stator winding, and draws a dynamic winding diagram based on the information to establish a winding digital model, so that multi-dimensional information can be integrated on the basis of the model; it can be used for inspection, testing, fault analysis and diagnosis of the stator winding, thereby improving the dimension and quality of generator status data, improving the digitalization level of stator analysis and diagnosis, improving the digitalization level of operation process, analyzing and diagnosing reliability, and promoting the automation of complex operation processes in professional fields.
[0191] To clearly illustrate the above embodiment, a specific example is provided. A large 18kV generator stator winding has 576 slots, 3 phases, 8 branches, a double-layer wave winding, and a pitch of 1-11-25. Each slot has two beveled spacers at the upper and lower ends, two end hoops between the upper and lower layers, and one spacer at the slot. The method of the present invention is used to extract parameters of the stator winding and establish a digital winding model. The generator stator winding digital model construction method in this example includes the following steps:
[0192] The first step is to extract the stator technical parameters: UN=18000, Z=576, Y: Y1=1, Y2=11, Y3=25, a=8, R: wave winding, LT=8.
[0193] The second step is to obtain the parameters of the fixed insulation components of the winding: as shown in Table 1.
[0194] The third step is to obtain the connection parameters of the winding: for example, Table 3 and Table 4 (showing 1 branch and the rest are the same).
[0195] Table 3: Some connection parameters of the lower layer of the winding:
[0196]
[0197] Table 4: Some connection parameters of the upper winding layer:
[0198]
[0199] Step 4: Calculate the position coordinates and electrical parameters, as shown in Tables 5 to 9 below.
[0200] Table 5: Voltage and position coordinates of the wire rods to ground
[0201]
[0202] Table 6: The voltage between the slot bars and the position coordinates of the slot spacers corresponding to the slot spacers
[0203]
[0204] Table 7: Voltage between notches and bars corresponding to bevel spacers and position coordinates of bevel spacers
[0205]
[0206] Table 8: The voltage between the upper and lower layers and the position coordinates of the interlayer intersection corresponding to the interlayer gap of the interlayer intersection
[0207]
[0208] Table 9: Voltage between the end hoop bevel bars and position coordinates of the interlayer end hoop corresponding to the interlayer end hoop
[0209]
[0210] The fifth step is to draw the dynamic model and fusion display, such as Figure 8 The real-time digitized unit pitch winding diagram shown (the winding part with slot number 100 as the center on the upper layer of the upper end of the stator winding), Figure 9 The diagram shows the voltage distribution of a branch winding and components.
[0211] In the descriptions of the foregoing embodiments, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.
[0212] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.
[0213] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.
[0214] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.
Claims
1. A method for constructing a digital model of a generator stator winding, characterized in that: The following steps are involved: Obtain stator technical parameters of generator stator winding; Combining the stator technical parameters and the structural information of the stator winding, obtaining fixed insulation component parameters and connection parameters of the stator winding; including: numbering the stator slots of the stator winding based on the stator technical parameters to obtain the slot number of each stator slot; obtaining the fixed insulation component parameters of the stator winding based on the structural information of the stator winding; and obtaining the connection parameters of the stator winding based on the slot number and the structural information of the stator winding; Based on the structural information of the stator winding, a coordinate system of the stator winding is established; and according to the stator technical parameters and the parameters and connection parameters of the fixed insulating component of the stator winding, a plurality of key positions of the stator winding and a coordinate representation of the fixed insulating component based on the coordinate system are obtained; the X coordinate of the coordinate system represents the coordinates of the stator winding in ascending order of slot number, the Y coordinate of the coordinate system represents the coordinate of the vertical height of the stator winding from bottom to top related to the pitch, and the Z coordinate of the coordinate system has a value range of [1, 2, 3, 4], which respectively represent the upper layer wire rod and fixed insulating component, the interlayer fixed insulating component, the lower layer wire rod and fixed insulating component, and the lower layer end hoop from the inside to the outside of the stator; Based on the stator technical parameters and the coordinate representation, obtaining a plurality of electrical parameters of the stator winding, a plurality of key positions of the stator winding, and position coordinates of the fixed insulating component; Based on the coordinate system, a dynamic winding model is drawn and displayed in combination with the structural information of the stator winding, the position coordinates of the multiple key positions and the fixed insulation component, and the multiple electrical parameters.
2. The method according to claim 1, characterized in that The obtaining of the stator technical parameters of the generator stator winding includes: According to the generator stator winding connection diagram, the stator technical parameters of the generator stator winding are obtained; wherein the stator technical parameters include the stator rated voltage UN, the number of stator slots Z, the winding pitch Y: Y1-Y2-Y3, the number of branches a, the number of stator core segments LT, and the winding type, wherein the winding type includes R-wave winding and lap winding.
3. The method according to claim 1, characterized in that The fixed insulation component parameters include the number and position of the slotted pads, the number and position of the beveled pads, and the number and position of the end hoops; the connection parameters include the branch name of each stator branch, the slot number of the wire rod in the branch, and the wire rod connection sequence number.
4. The method according to claim 3, characterized in that The parameters of the fixed insulating component are defined respectively for different positions located at the upper and lower layers and the upper and lower ends of the stator winding structure.
5. The method according to claim 1, characterized in that The step of obtaining, based on the stator technical parameters and the fixed insulating component parameters and connection parameters of the stator winding, a plurality of key positions of the stator winding and a coordinate representation of the fixed insulating component based on the coordinate system comprises: Based on the relationship between the slot number and the X coordinate, the X coordinate representation of each stator slot is determined; the value range of the X coordinate corresponds to the slot number; Determine the X-coordinate representation and Y-coordinate representation of each unit pitch; In combination with the fixed insulating component parameters and connection parameters of the stator winding, determine the coordinate representation of each wire rod in the upper layer, each slotted pad and beveled pad in the upper layer of the lower end portion, each position of the interlayer end hoops between layers and each intersection between layers, each slotted pad and beveled pad in the upper layer of the upper end portion, each position of the interlayer end hoops between layers and each intersection between layers, each wire rod in the lower layer, each slotted pad and beveled pad in the lower layer of the lower end portion, each position of the interlayer end hoops between layers and each intersection between layers, each slotted pad and beveled pad in the lower layer of the upper end portion, each position of the interlayer end hoops between layers and each intersection between layers, and each slotted pad and beveled pad in the lower layer of the upper end portion, each position of the interlayer end hoops between layers and each intersection between layers.
6. The method according to claim 2, characterized in that The step of obtaining, based on the stator technical parameters and the coordinate representation, a plurality of electrical parameters of the stator winding, a plurality of key positions of the stator winding, and position coordinates of the fixed insulating component comprises: Based on the stator technical parameters and the coordinate representation, obtaining the ground voltage and position coordinates of the wire bar; Based on the voltage of each wire bar to ground and the coordinate representation, obtaining the slot block voltage and position coordinates of the slot block; Based on the voltage of each wire bar to the ground and the coordinate representation, obtaining the bevel pad voltage and position coordinates of the bevel pad; Based on the voltage of each bar to the ground and the coordinate representation, obtaining the interlayer intersection voltage and position coordinates of the interlayer intersection; Based on the voltage of each wire bar to ground and the coordinate representation, the interlayer end clamp voltage and position coordinates of the interlayer end clamp are obtained.
7. The method according to claim 6, characterized in that After obtaining the plurality of electrical parameters of the stator winding, the plurality of key positions of the stator winding, and the position coordinates of the fixed insulating component, the method further includes: The voltage and position coordinates of each wire rod to the ground, the voltage and position coordinates of each interlayer bevel pad, the voltage and position coordinates between each interlayer intersection, and the voltage and position coordinates of the interlayer end hoop are recorded in a dictionary form.
8. The method according to claim 1, characterized in that The dynamic winding model includes any wire-bar diagram and a multi-wire-bar combination diagram, and the multi-wire-bar combination diagram includes a unit pitch winding diagram, a branch winding diagram and a phase winding diagram.
9. The method according to claim 1, characterized in that The drawing and display of the dynamic winding model includes: Based on the coordinate position of the dynamic winding model, the corresponding electrical parameters are displayed synchronously.