Method for constructing digital model of generator stator winding

Abstract

The invention provides a method for constructing a digital model of a generator stator winding. The method comprises the following steps: acquiring stator technical parameters of the generator stator winding; obtaining fixed insulation part parameters and connection parameters of the stator winding by combining the stator technical parameters and the structure information of the stator winding; establishing a coordinate system of the stator winding; obtaining a plurality of key positions of the stator winding and coordinate representation of a fixed insulation part based on a coordinate system according to the stator technical parameters and the fixed insulation part parameters and connection parameters of the stator winding; acquiring a plurality of electrical parameters of the stator winding, a plurality of key positions of the stator winding and position coordinates of a fixed insulating part based on the stator technical parameters and the coordinate representation; and drawing and displaying a dynamic winding model by combining the structural information of the stator winding, the plurality of key positions, the position coordinates of the fixed insulating part and the plurality of electrical parameters, so as to improve the digital level of stator analysis.

Description

Technical Field

[0001] This application relates to the technical field of generator operation and maintenance analysis and diagnosis, and particularly relates to a method for constructing a digital model of a generator stator winding. Background Art

[0002] Inspection of the insulation components of the stator winding of large generators is an important technical measure for energy enterprises' anti-measures, which can avoid unplanned outages of equipment and major electrical accidents of equipment. The winding structure of large generators is complex, with many insulation components, and the spaces between layers, phases, and branches overlap and interleave. It is difficult to timely obtain the voltage distribution between the winding spatial structures. At present, it is still impossible to carry out multi-dimensional information fusion analysis of stator winding electrical parameters, spatial structure parameters, test data, inspection information, etc. Only the operation risk can be judged and evaluated through the appearance, morphology, and color of the insulation components by experience, and the reliability is not high, and unplanned outages caused by insulation occur from time to time.

[0003] In addition, inspection photos, ultraviolet imaging detection pictures, etc. usually only record the slot numbers, and cannot reflect the specific spatial positions and electrical information of the insulation components in the winding and are semi-structured, which is also the reason for misjudgment in subsequent further analysis and diagnosis. With the in-depth promotion of the digital practice of the power industry, the digitalization of the key processes of operation, maintenance, testing, and commissioning of generators, which are the core equipment of the power system, is imperative. Summary of the Invention

[0004] This application proposes a method for constructing a digital model of a generator stator winding, aiming to solve at least one of the technical problems in the related art to some extent. The technical solution of this application is as follows: An embodiment of this application proposes a method for constructing a digital model of a generator stator winding, including: Obtain the stator technical parameters of the generator stator winding; Combined with the stator technical parameters and the structural information of the stator winding, obtain the fixed insulation component parameters and connection parameters of the stator winding; Based on the structural information of the stator winding, establish a coordinate system of the stator winding; and according to the stator technical parameters, the fixed insulation component parameters and connection parameters of the stator winding, obtain the coordinate representations of multiple key positions of the stator winding and the fixed insulation components based on the coordinate system; Based on the stator technical parameters and the coordinate representations, obtain multiple electrical parameters of the stator winding, as well as the position coordinates of multiple key positions of the stator winding and the fixed insulation components; Based on the coordinate system, combined with the structural information of the stator winding, the position coordinates of the multiple key positions and the fixed insulation components, and the multiple electrical parameters, draw and display a dynamic winding model.

[0005] The technical solution provided by the embodiments of the present application at least brings the following beneficial effects: In this technical solution, stator technical parameters of the generator stator winding are obtained, and combined with the structural information of the stator winding, the parameters of the fixed insulation components and connection parameters of the stator winding are obtained; a coordinate system of the stator winding is established, and according to 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 representations, multiple electrical parameters of the stator winding, 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 the winding digital model by obtaining the structural information, spatial position information and electrical information of the generator stator winding, and can integrate multi-dimensional information on the basis of this model, and can be used for the inspection, test and fault analysis and diagnosis of the stator winding, thereby improving the dimension and quality of the generator state data, improving the digital level of stator analysis and diagnosis, improving the digital level of the operation process, the reliability of analysis and diagnosis, and promoting the automation of complex operation processes in the professional field.

[0006] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. Description of the Drawings

[0007] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the drawings, where: Figure 1 is a schematic flow chart of a method for constructing a digital model of a generator stator winding provided by an embodiment of the present application; Figure 2 is a schematic diagram of the positions of a certain unit pitch winding and components provided by an example of the present application; Figure 3 is a schematic diagram of the connection of the U1 branch provided by an example of the present application; Figure 4 is a schematic diagram of the upper layer of the winding structure and parameters of a certain unit pitch provided by an example of the present application; Figure 5 is a schematic diagram of the lower layer of the winding structure and parameters of a certain unit pitch provided by an example of the present application; Figure 6 is a schematic diagram of a wire bar and coordinate parameters provided by an example of the present application; Figure 7 is a schematic diagram of a real-time digital unit pitch winding provided by an example of the present application; Figure 8 is a schematic diagram of a real-time digital unit pitch winding integrating electrical parameters provided by an example of the present application; Figure 9 Schematic diagram of voltage distribution of a certain branch winding and components provided by an example of this application. Specific implementation manners

[0008] The embodiments of this application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain this application and should not be construed as limiting this application. For those technical or conditions not specified in the embodiments, they shall be in accordance with the technologies or conditions described in the literature in this field or in accordance with the product specifications. For materials or equipment whose manufacturers are not specified, they are all conventional products that can be obtained by purchase.

[0009] The construction method, device and equipment of the digital model of the generator stator winding according to the embodiments of this application will be described below with reference to the accompanying drawings.

[0010] Figure 1 Schematic flow chart of a construction method of a digital model of a generator stator winding provided by an embodiment of this application. As Figure 1 shown, the construction method of the digital model of the generator stator winding includes the following steps: Step S101, obtain the stator technical parameters of the generator stator winding.

[0011] As an implementation manner, according to the wiring diagram of the generator stator winding, obtain the stator technical parameters of the generator stator winding.

[0012] In some embodiments, the stator technical parameters include the rated stator 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, where the winding type includes R-wave winding and lap winding.

[0013] Example 1: Obtain from the wiring diagram of the stator winding of a certain large generator the rated stator voltage of 18 kV, the number of stator slots of 576, the winding pitch Y: 1 - 11 - 25, the number of stator branches of 8, the winding type of wave winding, and the number of axial regions of the iron core segments of 8. Then the stator technical parameters of each generator are as follows: UN = 18000, Z = 576, Y: Y1 = 1, Y2 = 11, Y3 = 25, a = 8, LT = 8, R: wave winding.

[0014] Step S102, combine the stator technical parameters and the structural information of the stator winding to obtain the fixed insulation component parameters and connection parameters of the stator winding.

[0015] As an implementation, based on the stator technical parameters, number the stator slots of the stator winding to obtain the slot numbers of each stator slot; according to the structural information of the stator winding, obtain the parameters of the fixed insulation components of the stator winding; based on the slot numbers, according to the structural information of the stator winding, obtain the connection parameters of the stator winding; where the parameters of the fixed insulation components include the quantity and position of the slot mouth pads, the quantity and position of the bevel pads, and the quantity and position of the end rings; the connection parameters include the branch names of each stator branch, the slot numbers of the in-branch bars, and the bar connection sequence numbers.

[0016] Continuing with Example 1 below, Figure 2 The following shows a schematic diagram of the positions of a certain unit pitch winding and components, combined with Figure 2 to illustrate this step by way of example.

[0017] Figure 2 The following shows a schematic diagram of the positions of the upper and lower layer bars of a unit pitch centered on n, Figure 2 where the dashed line in the figure is the lower layer bar of this unit pitch, and the solid line is the upper layer bar. The 3 upper layer bars respectively correspond to the slots n - 1, n, and n + 1 in the figure. Thus, the 3 upper layer bars are also called the upper layer bar n - 1, the upper layer bar n, and the upper layer bar n + 1; the lower layer bar with a pitch of 1 plus 1 slot respectively corresponds to the slots from n - L1 to n and then to n + L2. Among them, the bars corresponding to n - L1, n, and n + L2 slots are connected to each other in the same branch. In the figure, the bar corresponding to the lower layer n - L1 and the upper layer n is connected and spans L1, that is, Y3 - Y2 slots. The upper layer bar corresponding to the upper layer n slot and the lower layer bar form L1 interlayer crossover points. The sequence numbers of these L1 interlayer crossover points extend from the iron core along the bar outward in sequence as 1, 2, 3....L1. The bar corresponding to the upper layer n and the lower layer n + L2 is connected and spans L2, that is, Y2 - Y1 slots. The upper layer bar corresponding to the upper layer n slot and the lower layer bar form L2 interlayer crossover points. The sequence numbers of these L2 interlayer crossover points extend from the iron core along the bar outward in sequence as 1, 2, 3....L2.

[0018] 1) Figure 2 In the upper layer bars n - 1 and n, a bevel gap is formed at the upper end. In this gap, install the slot mouth pads for fixing the winding, as shown in Figure 2 the rectangle in the figure, with the quantity N_ckus and the position Ckus; in this gap, install the bevel pads for fixing the winding, as shown in Figure 2 the rhombus in the figure, with the quantity N_xus and the position Xus; 2) Figure 2 In the upper layer bars n - 1 and n, a bevel gap is formed at the lower end. In this gap, install the slot mouth pads for fixing the winding, as shown in Figure 2 the rectangle in the figure, with the quantity N_ckds and the position Ckds. In this gap, install the bevel pads for fixing the winding, as shown in the rhombus in the figure, with the quantity N_xds and the position Xds; 3) Figure 2 An inclined gap is formed between the middle and lower layer bar conductors n - 1 and n at the upper end, and a notch spacer for fixing the winding is installed in this gap. See Figure 2 The rectangle in the middle, with the quantity of N_ckux and the position of Ckux, and an inclined spacer for fixing the winding is installed in this gap. See Figure 2 The rhombus in the middle, with the quantity of N_xux and the position of Xux; 4) Figure 2 An inclined gap is formed between the middle and lower layer bar conductors n - 1 and n at the lower end, and a notch spacer for fixing the winding is installed in this gap. See Figure 2 The rectangle in the middle, with the quantity of N_ckdx and the position of Ckdx, and an inclined spacer for fixing the winding is installed in this gap. See Figure 2 The rhombus in the middle, with the quantity of N_xdx and the position of Xdx; 5) Figure 2 The interlayer end rings installed between the upper and lower layer bar conductors are as shown by the solid - line parallelogram spanning the bar conductors n - 1, n, and n + 1. The quantity at the upper end is N_dum and the position is Dum, and the quantity at the lower end is N_ddm and the position is Ddm; 6) Figure 2 The end rings of the middle and lower layer bar conductors, as shown by the dashed - line parallelogram spanning the lower layer bar conductors n - 1, n, and n + 1. The quantity at the upper end is N_dux and the position is Dux, and the quantity at the lower end is N_ddx and the position is Ddx.

[0019] Due to the differences between the upper and lower layers and the upper and lower ends of the winding, the parameters are defined separately; that is, the parameters of the fixed insulation components are defined separately for different positions in the upper and lower layers and the upper and lower ends of the stator winding structure. The specific method is that whether it is the upper end or the lower end, the sequence numbers of various components and various key points are sequentially marked as No. 1 (or serial number 1), No. 2, No. 3... starting from the stator core and extending outward along the bar conductor direction. For example, if there are 2 notch spacers between the lower layer bar conductors n - 1 and n, the sequence numbers of these two notch spacers are sequentially serial number 1 and serial number 2; the sequence numbers of 10 cross - points of the upper and lower layer bar conductors (i.e., interlayer cross - points) are sequentially marked as No. 1, No. 2,... No. 10 starting from the stator core and extending outward along the bar conductor direction. The quantity of notch spacers, inclined spacers, and end rings between adjacent two bar conductors is recorded as the quantity of this component. For example, if there are two notch spacers between the lower layer bar conductors n - 1 and n, the quantity of notch spacers between the lower layer bar conductors n - 1 and n is recorded as 2. The spatial positions of each fixed insulation component are recorded with the sequence number value of the cross - point of the upper and lower layer bar conductors (i.e., interlayer cross - point) as the scale. For example, as Figure 2As shown, 1-L2 is the serial number of the interlayer intersection point. The serial number value of the interlayer intersection point corresponding to the interlayer end hoop with serial number 1 is 5, so 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. Then the parameters of the winding fixing insulation components are recorded in Table 1 below. The position parameter example in Table 1 is the serial number value of the interlayer intersection point.

[0020] Table 1: Parameters of Winding Fixing Insulation Components

[0021] Continue below with Figure 2 the structure shown as an example to describe in detail how to obtain the winding connection parameters.

[0022] As an implementation method, obtain connection information in units of branches, including branch names, slot numbers of the in-bar conductors in the branch, and the in-bar conductor connection sequence numbers. Among them, the branch names are defined as U1, U2,....Un, V1, V2,....Vn, W1, W2,....Wn, where n is equal to the number of branches a; the in-bar conductor connection sequence numbers are 1, 2, 3...... Ni in sequence from the end to the head of the branch, and Ni is the number of in-bar conductors in a single branch. ; Figure 3 is a connection schematic diagram of the U1 branch, which is counted for upper and lower layer in-bar conductors. Figure 3 The sequence numbers from 1 to 5 in it are the in-bar conductor connection sequence numbers; the connection parameters of the branch are recorded in Table 2 below, including the in-bar conductor connection sequence numbers and the slot numbers of the in-bar conductors in the branch, etc.

[0023] Table 2: Connection Parameters of U1 Branch

[0024] The connection parameters of the remaining branches are obtained in this way.

[0025] Step S103, based on the structure information of the stator winding, establish a coordinate system for the stator winding; and according to the stator technical parameters, the parameters of the winding fixing insulation components and the connection parameters, obtain the coordinate representations of multiple key positions of the stator winding and the winding fixing insulation components based on the coordinate system.

[0026] As an implementation method, establish a coordinate system for the stator winding. 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 coordinates of the vertical height of the stator winding from bottom to top, and the value range of the Z coordinate of the coordinate system is [1, 2, 3, 4], which respectively represent the upper layer in-bar conductors and the winding fixing insulation components, the interlayer fixing insulation components, the lower layer in-bar conductors and the winding fixing insulation components, and the lower end hoops from the inside to the outside of the stator.

[0027] Exemplarily,Figure 4 , Figure 5 are respectively the upper and lower layer schematic diagrams of the winding structure and parameters of a certain generator in Example 1, Figure 4 and Figure 5 show the upper and lower layer bar conductors and related component structures and position parameters of the nth slot. The winding structure corresponding to one pair of magnetic poles of the basic unit of a stator structure is one complete pitch. Figure 4 and Figure 5 In them, L1 = Y3 - Y2 represents the span of the upper end part of the winding, and L2 = Y2 - Y1 represents the span of the lower end part of the winding. n - L1....n - 1, n, n + 1, n + 2....n + L2 represent the slot numbers in the upper layer view, and n + L1....n + 1, n, n - 1, n - 2....n - L2 represent the slot numbers in the lower layer view, which are used to determine the lateral spatial position of the bar conductor and are related to the X coordinate. 1, 2, 3...7, 8, 9...L1 represent the sequence numbers of the intersection points of the upper and lower layer bar conductors at the upper end part, and 1, 2, 3...7...L2 represent the sequence numbers of the intersection points of the upper and lower layer bar conductors at the lower end part. The sequence numbers are used to describe the spatial positions of the end winding fixing insulation components and are related to the X and Y coordinates. LT is the length of the straight segment of the bar conductor. Taking the number of iron core segments, if the iron core is composed of 8 segments from bottom to top, then LT = 8, which is related to the Y coordinate.

[0028] Establish a coordinate system for the stator winding. Y represents the coordinate from bottom to top (from Y1 to Y3 + LT), that is, the vertical height coordinate of the winding from bottom to top, and X represents the coordinate of the stator winding in ascending order of slot numbers.

[0029] As an implementation method, a method for obtaining the coordinate representations of multiple key positions of the stator winding and the fixing insulation components based on the coordinate system includes: determining the X - coordinate representation of each stator slot based on the 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 Y - coordinate representation of each unit pitch; combining the parameters of the fixing insulation components and connection parameters of the stator winding to determine the coordinates of each upper - layer bar conductor, each slot - mouth spacer and bevel spacer at the lower - end upper layer, each position and each intersection point between layers of the inter - layer end hoop at the lower - end layer, each slot - mouth spacer and bevel spacer at the upper - end upper layer, each position and each intersection point between layers of the inter - layer end hoop at the upper - end layer, each lower - layer bar conductor, each slot - mouth spacer and bevel spacer at the lower - end lower layer, each position and each intersection point between layers of the inter - layer end hoop at the lower - end layer, each slot - mouth spacer and bevel spacer at the upper - end lower layer, and each position and each intersection point between layers of the inter - layer end hoop at the upper - end layer.

[0030] Exemplarily, determine the relationship between the X coordinate and the slot number, , taking the nth slot as an example , and by analogy for the (n + 1)th slot , the value range of the X coordinate corresponds to the slot number. When n = 1, X1 = 1 is the smallest, that is, the X coordinate of the slot numbered 1 is the smallest; when n = Z, is the largest, that is, the X coordinate of the slot number Z is the largest; the above Figure 4 X coordinates of each unit pitch are expressed as follows:

[0031] Determine that the Y coordinate represents the spatial height position of each fixed insulating component from bottom to top. Then, the Y coordinates of the above unit pitches are as follows:

[0032] Based on the established coordinate system, determine the coordinate representations of multiple stator bars and each component to locate the spatial positions of the stator bars and the fixed insulating components. Among them, the height position of the stator bar is the central height position of the stator bar. In the previous steps, it has been determined that the sequence number of the fixed insulating component is consistent with the sequence number of the interlayer intersection point. To accurately locate and have uniqueness, increase the range of the Z value of the coordinate system dimension to [1, 2, 3, 4]. This range represents the upper stator bars and the fixed insulating components, the interlayer fixed insulating components, the lower stator bars and the fixed insulating components, and the lower end rings from the inside to the outside of the stator respectively.

[0033] The coordinates of the upper stator bar and each component are represented by parameters such as n, Y1, Y2, Y3, LT, Xds, Ddm, Xus, Dum, etc. Taking the unit shown in Figure 4 as an example, the coordinate representation is as follows: 1) Upper stator bar n: Stator bar XYZ coordinates:

[0034] 2) Lower end of the upper layer XYZ coordinates of the right slot mouth spacer:

[0035] XYZ coordinates of the left slot mouth spacer:

[0036] XYZ coordinates of the right bevel spacer:

[0037] XYZ coordinates of the left bevel spacer:

[0038] 3) Lower end of the interlayer XYZ coordinates of the upper and lower interlayer end rings:

[0039] XYZ coordinates of the left interlayer end ring:

[0040] XYZ coordinates of the right interlayer end ring:

[0041] XYZ coordinates of the 1st point of the winding interlayer intersection:

[0042] XYZ coordinates of the 2 intersection points between winding layers:

[0043] XYZ coordinates of the 3 intersection points between winding layers: ..... XYZ coordinates of the L2 intersection point between winding layers:

[0045] 4) Upper end upper layer XYZ coordinates of the right slot mouth spacer:

[0046] XYZ coordinates of the left slot mouth spacer:

[0047] XYZ coordinates of the right bevel spacer:

[0048] XYZ coordinates of the left bevel spacer:

[0049] 5) Upper end interlayer XYZ coordinates of the upper and lower interlayer end rings:

[0050] XYZ coordinates of the left interlayer end ring:

[0051] XYZ coordinates of the right interlayer end ring:

[0052] XYZ coordinates of the 1 intersection point between winding layers:

[0053] XYZ coordinates of the 2 intersection points between winding layers:

[0054] XYZ coordinates of the 3 intersection points between winding layers: ..... XYZ coordinates of the L1 intersection point between winding layers:

[0056] The coordinates of the lower layer wire bar and each component are represented by the obtained parameters. Taking Figure 5 the lower layer view as an example, the coordinates are as follows: Lower layer wire bar n Wire bar XYZ coordinates:

[0057] 2) Lower end lower layer XYZ coordinates of the left slot mouth spacer:

[0058] XYZ coordinates of the right slot pad:

[0059] XYZ coordinates of the left bevel pad:

[0060] XYZ coordinates of the right bevel pad:

[0061] 3) Lower end interlayer XYZ coordinates of the upper and lower interlayer end hoops:

[0062] XYZ coordinates of the left interlayer end hoop:

[0063] XYZ coordinates of the right interlayer end hoop:

[0064] XYZ coordinates of the first intersection point of the winding interlayer:

[0065] XYZ coordinates of the second intersection point of the winding interlayer:

[0066] XYZ coordinates of the third intersection point of the winding interlayer: ..... XYZ coordinates of the L2 intersection point of the winding interlayer:

[0068] XYZ coordinates of the left lower end hoop:

[0069] XYZ coordinates of the left lower end hoop:

[0070] 4) Lower layer of the upper end XYZ coordinates of the left slot pad:

[0071] XYZ coordinates of the right slot pad:

[0072] XYZ coordinates of the left bevel pad:

[0073] XYZ coordinates of the right bevel pad:

[0074] 5) Interlayer of the upper end XYZ coordinates of the upper and lower interlayer end hoops:

[0075] XYZ coordinates of the left interlayer end hoop:

[0076] XYZ coordinates of the right interlayer end hoop:

[0077] XYZ coordinates of the intersection point 1 of the winding layers:

[0078] XYZ coordinates of the intersection point 2 of the winding layers:

[0079] XYZ coordinates of the intersection point 3 of the winding layers: ..... XYZ coordinates of the intersection point L2 of the winding layers:

[0081] XYZ coordinates of the left lower end hoop:

[0082] XYZ coordinates of the left lower end hoop:

[0083] Thus, the coordinate representations of multiple positions and components of the generator stator winding are obtained by an example method.

[0084] Step S104, based on the stator technical parameters and the coordinate representation, obtain multiple electrical parameters of the stator winding and the position coordinates of multiple key positions and fixed insulation components of the stator winding.

[0085] As an example, based on the stator technical parameters and the coordinate representation, obtain the ground voltage and position coordinates of the bar; based on the ground voltage and coordinate representation of each bar, obtain the notch pad voltage and position coordinates of the notch pad; based on the ground voltage and coordinate representation of each bar, obtain the bevel pad voltage and position coordinates of the bevel pad; based on the ground voltage and coordinate representation of each bar, obtain the interlayer intersection voltage and position coordinates of the interlayer intersection; based on the ground voltage and coordinate representation of each bar, obtain the interlayer end hoop voltage and position coordinates of the interlayer end hoop.

[0086] In some embodiments, after obtaining multiple electrical parameters of the stator winding and the position coordinates of multiple key positions and fixed insulation components of the stator winding, it includes: recording the ground voltage and position coordinates of each bar, the bevel pad voltage and position coordinates of each interlayer, the voltage and position coordinates between each interlayer intersection, and the interlayer end hoop voltage and position coordinates of the interlayer end hoop in the form of a dictionary.

[0087] The acquisition of each electrical parameter will be described in detail below.

[0088] Step 1, calculate the ground voltage of each bar and the coordinates of each bar.

[0089] Taking the calculation of the ground voltage of the nth slot bar as an example, determine the end part (D\U), layer (S\X), slot (n), phase (A\B\C), branch (U1, U2...V1, V2...W1, W2...), and the connection sequence number k of the nth slot bar connection through the connection parameters in Table 2. Calculate the ground voltage V_s_n and coordinates XYZ of the nth slot bar through the following formula:

[0090] (2) Record the ground voltage and other parameters of each bar obtained in dictionary form.

[0091] For example, the calculation result and record result of the ground voltage of the bar in the 100th slot of the upper layer of a certain generator are as follows: {'End part': 'U', 'Layer': 'S', 'Slot': 100, 'Phase': 'A', 'Branch': 'U4', 'Serial number': 32, 'Ground voltage': 6928} (3) According to the above method, the ground voltage and position coordinates of the upper layer n - 1, n, n + 1 and the lower layer n - L1..., n - 1, n, n + 1....n + L2 bar can be calculated in turn. The ground voltage and position coordinate parameters of the upper and lower layer bars with a unit pitch centered on n are formed into a list. The calculation result with the 100th (i.e., n = 100) slot of the upper layer of a certain generator as the center is as follows: Slot number: [99, 100, 101, 100, 99, 98, 97, 96, 95, 94, 93, 92, 91, 90, 89, 88, 87] For example, the record result is as follows: {'Name': 'S bar', 'End part': 'U', 'Layer': 'S', 'Slot': 99, 'Phase': 'A', 'Branch': 'U5', 'Serial number': 26, 'Ground voltage': 5629, 'Coordinate': [197, 17, 1]}; {'Name': 'S bar', 'End part': 'U', 'Layer': 'S', 'Slot': 100, 'Phase': 'A', 'Branch': 'U4', 'Serial number': 32, 'Ground voltage': 6928, 'Coordinate': [199, 17, 1]}; ....; {"Name": "X-ray bar", "End": "U", "Layer": "X", "Slot": 88, "Phase": "C", "Branch": "W5", "Serial number": 41, "Voltage to ground": 8660, "Coordinates": [175, 16, 3]}; {"Name": "X-ray bar", "End": "U", "Layer": "X", "Slot": 87, "Phase": "C", "Branch": "W6", "Serial number": 47, "Voltage to ground": 9959, "Coordinates": [173, 16, 3]}。

[0092] Step 2, calculate the voltage V_CK of each slot mouth spacer (i.e., the voltage between the slot mouth bars corresponding to the slot mouth spacer) and the position information.

[0093] The following takes the calculation of the voltage V_CK and the position coordinates XYZ of the slot mouth spacer between n-1 and n as an example for illustration.

[0094] On the basis of obtaining the voltages V_s_n to the ground of the bars in the upper layer of slots n-1 and n and the phase, the following formula is used to calculate the voltage V_CK of the slot mouth spacer:

[0095] For example, the calculation results of the voltage of the slot mouth spacer of the unit pitch centered on the 99th and 100th slots in the upper layer of a certain generator are recorded as follows: {"Name": "Slot mouth spacer", "Serial number": 1, "End": "U", "Layer": "S", "Slot number": "99-100", "Voltage between slot mouth bars": ["UAA", 10894], "Relevant relationship": "Same phase", "Branch relationship": "U5U4", "Coordinates": [198, 18, 1]}。

[0096] Step 3, calculate the voltage V_XB of each bevel spacer (i.e., the voltage between the bevel bars corresponding to the bevel spacer) and the position information.

[0097] The following takes the calculation of the bevel spacer voltage V_XB between n-1 and n and the position coordinates XYZ as an example for illustration.

[0098] 1) On the basis of obtaining the voltages V_s_n to the ground of the bars in the upper layer of slots n-1 and n and the phase, the following parameters and formula are used for calculation:

[0099] According to the above formula, when there are multiple bevel spacers, repeat the calculation by replacing the position parameters Xus or Xds of the bevel spacers.

[0100] For example, the calculation results of the pitch unit centered on slots 99 and 100 in the upper layer of a certain generator are recorded as follows: {"Name": "Bevel pad", "Serial number": 1, "End part": "U", "Layer": "S", "Slot number": "99 - 100", "Voltage between bevel bars": ["UAA", 10894], "Phase relationship": "In-phase", "Branch relationship": "U5U4", "Coordinates": [194, 23, 1]} Step 4, calculate the voltage V_SX at the interlayer intersection of the bars (i.e., the voltage between the upper and lower layers corresponding to the interlayer gap where the interlayer intersection is located).

[0101] The following takes the calculation of the voltage V_SX and coordinates XYZ between the interlayer intersections between the nth bar in the upper layer and the bars n - L1,..., n - 1, n, n + 1....n + L2 in the lower layer as an example for illustration.

[0102] On the basis of obtaining the ground voltages V_s_n of the bars in slots n in the upper layer and n in the lower layer and the phase, calculate the voltage at the first interlayer intersection using the following parameters and formulas:

[0103]

[0104] 2) Modify the lower layer slot to n - 1, , calculate the voltages at two points of the interlayer intersection at the upper end of the winding, and successively substitute the slots n - 2, n - 3...n - L1 and the coordinates of the corresponding interlayer intersections in the above steps to calculate the voltages at other interlayer intersections at the upper end; 3) Modify the lower layer slot to n + 1, , calculate the voltages at two points of the interlayer intersection at the lower end of the winding, and successively substitute the slots n + 2, n + 3...n + L2 and the corresponding interlayer coordinates in the above steps to calculate the voltages at other points of the interlayer intersection at the lower end; For example, the calculation results of the voltages and position coordinates at points 1 and 2 of the interlayer intersection between the 100th slot in the upper layer and the bars in the lower layer of a certain generator are recorded as follows: {"Name": "Interlayer gap", "Serial number": 1, "End part": "U", "Layer": "SX", "Slot number": "100 - 100", "Voltage between upper and lower layers": ["UAC", 8529], "Phase relationship": "Out-of-phase", "Branch relationship": "U4W4", "Coordinates": [199, 19, 2]}, {"Name": "Interlayer Gap", "Serial Number": 2, "End": "U", "Layer": "SX", "Slot Number": "100-99", "Interlayer Voltage between Upper and Lower Layers": ["UAC", 7660], "Phase Relationship": "Out-of-Phase", "Branch Relationship": "U4W5", "Coordinates": [198, 20, 2]}.

[0105] Step 5, calculate the interlayer end hoop voltage V_DM (i.e., the interlayer voltage between the upper and lower end hoops) and the position coordinates.

[0106] Take the calculation of the interlayer end hoop voltage V_DM and the position coordinates XYZ between the upper layer n and the lower layer as an example below.

[0107] 1) The position of the upper end interlayer end hoop in Table 1 is Dum. Based on the ground voltages V_s_n and phases of the slot bars of the upper layer n slot and the lower layer n-Dum slot obtained in the above steps, the interlayer end hoop voltage is calculated using the following parameters and formulas:

[0108]

[0109] For the case where there are two or more upper end hoops, replace the corresponding position parameter Dum and apply the above formula to calculate respectively.

[0110] 2) The position of the lower end interlayer end hoop in Table 1 is Ddm. Based on the ground voltages V_s_n and phases of the slot bars of the upper layer n slot and the lower layer n+Ddm slot obtained in the above steps, the interlayer end hoop voltage and the coordinates XYZ are calculated using the following parameters and formulas:

[0111] For the case where there are more lower end hoops, take the corresponding position parameter Ddm and apply the above formula to calculate respectively.

[0112] For example, taking the upper end two-end hoop of a generator as an example, the calculation results of the 100th slot bar of the upper layer are recorded as follows: {"Name": "Interlayer End Hoop", "Serial Number": 1, "End": "U", "Slot Number": "99-100", "Phase Relationship": "In-Phase", "Branch Relationship": "U5U4", "Coordinates": [192, 25, 2], "Interlayer Voltage between Upper and Lower End Hoops": ["UAB", 11999]}, {"Name": "Interlayer End Hoop", "Serial Number": 2, "End": "U", "Slot Number": "99 - 100", "Relevant Relationship": "In - phase", "Branch Relationship": "U5U4", "Coordinates": [187, 30, 2], "Interlayer Voltage between Upper and Lower End Hoops": ["UAC", 9496]}.

[0113] Step S105, based on the coordinate system, combined with the structural information of the stator winding, the position coordinates of multiple key positions and fixed insulation components, and multiple electrical parameters, draw and display a dynamic winding model.

[0114] As an example, the dynamic winding model includes any bar diagram and multi - bar combination diagram. The multi - bar combination diagram includes unit pitch winding diagram, branch winding diagram, and phase winding diagram.

[0115] In this embodiment, the parameters of a single bar can be established. Based on the coordinate system of the stator winding, through parameter control, the drawing of any bar diagram and multi - bar combination diagram can be realized, including unit pitch winding diagram, branch winding diagram, phase winding diagram, etc.

[0116] 1) Figure 6 The figure shows the schematic diagram of the upper and lower layer bars of the n - th slot and the coordinate parameters. Y1, Y2, Y3 are the pitch parameters of the winding, and LT is the number of iron core segments parameter. The upper - layer bar is composed of four point - line segments S1, S2, S3, S4 connected. The two - dimensional coordinates are S1(2n - 1-(Y3 - Y2), Y3 + LT), S2(2n - 1, Y2 + LT), S3(2n - 1, Y2), S4(2n - 1+(Y2 - Y1), Y1); the lower - layer bar is composed of four point - line segments X1, X2, X3, X4 connected. The two - dimensional coordinates are X1(2n - 1+(Y3 - Y2), Y3 + LT), X2(2n - 1, Y2 + LT), X3(2n - 1, Y2), X4(2n - 1-(Y2 - Y1), Y1).

[0117] 2) Take the upper - layer coordinate parameters in 1) as the control parameters for drawing the upper - layer bar of the n - th slot, and the lower - layer coordinate parameters as the control parameters for drawing the lower - layer bar of the n - th slot. Control the drawing of the bar of any slot through the slot number and coordinate parameters; determine the branch where the bar is located by the slot number and layer through the obtained connection parameter table. If it is an A - phase branch, draw it in yellow, if it is a B - phase branch, draw it in green, and if it is a C - phase branch, draw it in red; the specific drawing is completed by computer code, and the above are the control parameters.

[0118] 3) Draw the unit pitch winding centered on the nth slot through the slot numbers of the upper layer n-1, n, n+1 and the lower layer n-L1..., n-1, n, n+1....n+L2 for maintenance inspection. Taking a generator with Y1=1, Y2=11, Y3=25 and the 20th slot in the upper layer as an example, draw a schematic diagram of the real-time digital unit pitch winding for inspection, as Figure 7 shown.

[0119] 4) Input the slot numbers of a complete branch through the connection parameter table obtained in the previous steps, and the winding connection diagram of the complete branch can be drawn for winding connection analysis.

[0120] As an example, based on the coordinate positions of the dynamic winding model, the corresponding electrical parameters are synchronously displayed. That is, when showing the winding diagram, the obtained electrical parameters can be fused with the position parameters, and the relevant electrical parameters calculated in the previous steps are synchronously displayed according to the coordinate positions to achieve the multi-dimensional information fusion display.

[0121] In some embodiments, the electrical parameters of the winding can be retrieved and displayed according to conditions. For example, draw a partial winding according to the unit pitch to display the high-voltage area in the winding structure to guide the maintenance inspection operation and prompt the accurate fault troubleshooting in the high-risk area. When drawing the complete branch or phase winding, the voltage can be intuitively displayed on the winding structure, making the spatial voltage distribution of the winding clear at a glance and enabling the timely identification of the deficiencies in the winding design.

[0122] Plant the application program corresponding to the above method into a portable terminal for the on-site maintenance operation of the stator winding. Record the operation information pictures and voices and associate them with the spatial coordinate positions for storage, realizing the multi-source information fusion of the spatial position information, electrical information, and inspection information of the stator winding and the digitization of the maintenance inspection operation.

[0123] It should be noted that the present invention details the process of the construction method of the digital model of the generator stator winding. This method is applicable to generators with different parameters. The examples of the present invention are all described with wave winding parameters, and this method is also applicable to lap windings, which can be achieved by modifying the coordinates in this step.

[0124] The method for constructing a digital model of a generator stator winding according to an embodiment of the present application includes obtaining the stator technical parameters of the generator stator winding, combining the structural information of the stator winding to obtain the fixed insulation component parameters and connection parameters of the stator winding; establishing a coordinate system for the stator winding, and according to the obtained parameters, obtaining the coordinate representations of multiple key positions of the stator winding and the fixed insulation components; based on the coordinate system and the coordinate representations, obtaining multiple electrical parameters of the stator winding, as well as the position coordinates of multiple key positions of the stator winding and the fixed insulation components, and drawing and displaying a dynamic winding model according to the position coordinates; thus, this solution can establish a winding digital 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 this information, so that multi-dimensional information can be integrated on the basis of this model; it can be used for the inspection, testing, and fault analysis and diagnosis of the stator winding, thereby improving the dimension and quality of the generator status data, improving the digital level of stator analysis and diagnosis, improving the digital level of the operation process, the reliability of analysis and diagnosis, and promoting the automation of complex operation processes in the professional field.

[0125] To clearly illustrate the above embodiments, specific examples are now used for illustration. For a certain large 18 kV generator stator winding with 576 slots, 3 phases, 8 branches, double-layer wave winding, pitch 1-11-25, there are 2 bevel pads per slot at both the upper and lower ends, 2 end rings between the upper and lower layers, and 1 pad at the slot opening. The parameters of this stator winding are extracted and a winding digital model is established by the method of the present invention. The method for constructing the digital model of the generator stator winding in this example includes the following steps: 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.

[0126] The second step is to obtain the fixed insulation component parameters of the winding: as shown in Table 1.

[0127] The third step is to obtain the connection parameters of the winding: for example, Tables 3 and 4 (showing the same for other 1 branch).

[0128] Table 3: Partial connection parameters of the lower layer of the winding:

[0129] Table 4: Partial connection parameters of the upper layer of the winding:

[0130] The fourth step is to calculate the position coordinates and electrical parameters, as shown in Tables 5 to 9 below.

[0131] Table 5: Ground voltage and position coordinates of the bar

[0132] Table 6: Voltages between slot wedges corresponding to slot wedges and position coordinates of slot wedges

[0133] Table 7: Voltages between slot wedges corresponding to bevel wedges and position coordinates of bevel wedges

[0134] Table 8: Voltages between upper and lower layers corresponding to interlayer gaps to which interlayer intersections belong and position coordinates of interlayer intersections

[0135] Table 9: Voltages between end hoop bevel bars corresponding to interlayer end hoops and position coordinates of interlayer end hoops

[0136] Step 5, draw a dynamic model and fusion display, such as Figure 8 Schematic diagram of real-time digital unit pitch winding shown (the winding part in the upper layer of the upper end of the stator winding with slot number 100 in the middle), Figure 9 Schematic diagram of voltage distribution of a certain branch winding and its components shown.

[0137] In the descriptions of the foregoing embodiments, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations 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, without conflict, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0138] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0139] Those of ordinary skill in the art in this technical field can understand that all or part of the steps carried by the methods of the foregoing embodiments can be completed by instructing relevant 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 embodiments.

[0140] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to 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 Including the following steps: Obtain the stator technical parameters of the generator stator winding; Combine the stator technical parameters and the structural information of the stator winding to obtain the fixed insulation component parameters and connection parameters of the stator winding; Based on the structural information of the stator winding, establish the coordinate system of the stator winding; and according to the stator technical parameters, the fixed insulation component parameters and connection parameters of the stator winding, obtain the multiple key positions of the stator winding and the coordinate representations of the fixed insulation components based on the coordinate system; Based on the stator technical parameters and the coordinate representations, obtain the multiple electrical parameters of the stator winding, as well as the position coordinates of the multiple key positions of the stator winding and the fixed insulation components; Based on the coordinate system, combine the structural information of the stator winding, the position coordinates of the multiple key positions and the fixed insulation components, and the multiple electrical parameters, to draw and display a dynamic winding model.

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 wiring diagram of the generator stator winding, obtain the stator technical parameters of the generator stator winding; 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 parallel paths a, the number of stator core segments LT, the winding type, and the winding type includes R-wave winding and lap winding.

3. The method according to claim 1, wherein The combining of the stator technical parameters and the structural information of the stator winding to obtain the fixed insulation component parameters and connection parameters of the stator winding includes: Based on the stator technical parameters, number the stator slots of the stator winding to obtain the slot numbers of each stator slot; According to the structural information of the stator winding, obtain the fixed insulation component parameters of the stator winding; wherein, the fixed insulation component parameters include the quantity and position of the slot mouth pads, the quantity and position of the bevel pads, and the quantity and position of the end rings; Based on the slot numbers, according to the structural information of the stator winding, obtain the connection parameters of the stator winding; wherein, the connection parameters include the branch names of each stator branch, the slot numbers of the in-line bars in the branch, and the bar connection sequence numbers; 4. The method according to claim 3, characterized in that The fixed insulation component parameters are defined separately for different positions in the upper and lower layers and the upper and lower ends of the stator winding structure.

5. The method according to claim 1, wherein The establishing of the coordinate system of the stator winding based on the structural information of the stator winding includes: Based on the structural information of the stator winding, establish the coordinate system of the stator winding. 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 coordinates of the stator winding from bottom to top, and the value range of the Z coordinate of the coordinate system is [1, 2, 3, 4], which respectively represent the upper-layer in-line bars and fixed insulation components, inter-layer fixed insulation components, lower-layer in-line bars and fixed insulation components, and lower-end rings of the stator from inside to outside.

6. The method according to claim 1, wherein The obtaining of the coordinate representations of the multiple key positions of the stator winding and the fixed insulation components based on the coordinate system according to the stator technical parameters, the fixed insulation component parameters and connection parameters of the stator winding includes: Based on the relationship between the slot number and the X coordinate, determine the X coordinate representation of each stator slot; 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; Combined with the fixed insulation component parameters and connection parameters of the stator winding, determine the coordinates of each position of the upper layer bars, the upper layer slot mouth pads and bevel pads at the lower end, the interlayer end rings at the lower end interlayer and each interlayer intersection point, the upper layer slot mouth pads and bevel pads at the upper end, the interlayer end rings at the upper end interlayer and each interlayer intersection point, the lower layer bars, the lower layer slot mouth pads and bevel pads at the lower end, the interlayer end rings at the lower end interlayer and each interlayer intersection point, the upper layer slot mouth pads and bevel pads at the upper end, the interlayer end rings at the upper end interlayer and each interlayer intersection point.

7. The method according to claim 2, characterized in that Based on the stator technical parameters and the coordinate representation, obtain multiple electrical parameters of the stator winding, multiple key positions of the stator winding, and the position coordinates of the fixed insulation components; including: Based on the stator technical parameters and the coordinate representation, obtain the ground voltage and position coordinates of the bar; Based on the ground voltage of each bar and the coordinate representation, obtain the slot mouth pad voltage and position coordinates of the slot mouth pad; Based on the ground voltage of each bar and the coordinate representation, obtain the bevel pad voltage and position coordinates of the bevel pad; Based on the ground voltage of each bar and the coordinate representation, obtain the interlayer intersection voltage and position coordinates of the interlayer intersection point; Based on the ground voltage of each bar and the coordinate representation, obtain the interlayer end ring voltage and position coordinates of the interlayer end ring.

8. The method according to claim 7, characterized in that After obtaining the multiple electrical parameters of the stator winding, multiple key positions of the stator winding, and the position coordinates of the fixed insulation components, including: Record the ground voltage and position coordinates of each bar, the bevel pad voltage and position coordinates of each interlayer bevel pad, the voltage and position coordinates between each interlayer intersection point, and the interlayer end ring voltage and position coordinates of the interlayer end ring in dictionary form.

9. The method according to claim 1, characterized in that, The dynamic winding model includes any single bar diagram and multi-bar combination diagrams, and the multi-bar combination diagrams include unit pitch winding diagrams, branch winding diagrams, and phase winding diagrams.

10. The method according to claim 1, wherein Drawing and displaying the dynamic winding model includes: Based on the coordinate positions of the dynamic winding model, synchronously display the corresponding electrical parameters.

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