A calculation method, system and storage medium for electromagnetic vibration of generator stator end

Abstract

The invention relates to a calculation method, system and storage medium for electromagnetic vibration of a stator end of a generator, comprising establishing a three-dimensional electromagnetic force simulation analysis finite element model for a generator end region; establishing corresponding excitation sources according to armature current and excitation current parameters under different working conditions, and calculating the electromagnetic force density distribution of a stator end winding; importing a stator end geometric model into vibration simulation software to perform node division on all wire rods of the stator end winding to obtain node information of the stator end winding; obtaining the electromagnetic force of the stator end winding at the node according to the electromagnetic force density distribution of the stator end winding under different working conditions and the node information of the stator end winding; loading the electromagnetic force of the stator end winding at the node onto the stator end winding in the form of a node force, establishing a three-dimensional vibration analysis finite element model of the generator stator end winding, and calculating the vibration amplitude and stress amplitude of the generator stator end winding under different working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of generators, and particularly to a calculation method, system and storage medium for electromagnetic vibration at the end of a generator stator. Background Art

[0002] Electric power is an essential resource in the rapid development of industrialization and urbanization, and the demand for electric power resources has been increasing year by year. To meet the demand, the grid capacity has been continuously improved, and the manufacturing and operation technologies of the grid have been continuously innovated. A generator is the power source for electric power production, and its stable operation plays a crucial role in ensuring the normal operation of the power system. The end winding of a turbogenerator stator is a complex basket-shaped structure. The current-carrying bar conductors in the winding will generate electromagnetic forces at twice the power frequency under the action of the end leakage magnetic field of the generator, inducing vibration. As the generator capacity increases, the electromagnetic force and vibration also increase. If the vibration deformation amplitude and stress amplitude exceed the limit, the winding structure will experience fatigue damage, causing irreversible damage to the generator, affecting the normal operation of the generator, and even leading to accidents in severe cases. When the stator winding operates in an environment of fatigue damage for a long time, problems such as vibration wear at the nose end and involute of the bar, insulation layer peeling off, and loosening of the pressing plate screw may occur, and sometimes faults such as short circuits may also be caused. Under the short-circuit fault condition, the currents in the stator winding and the rotor winding suddenly increase by dozens of times. The electromagnetic force on the bar is proportional to the square of the current, and its value is dozens of times or even hundreds of times that under normal conditions. The strong electromagnetic force will cause an increase in end vibration, resulting in damage to the binding tape and insulation layer. Therefore, it is of great significance for the optimal design of the generator stator end winding to perform finite element modeling on the stator end, understand the distribution law of electromagnetic forces between the bar conductors at the stator end and the dynamic response under the action of electromagnetic forces, reasonably fix the end structure, and enhance the fixing effect.

[0003] The overall structure of the steam turbine generator is complex. Due to the complexity of the shape and material, it is difficult to obtain an accurate magnetic field structure that meets the actual operating conditions for the calculation of the end leakage magnetic field. The calculation of the electromagnetic force is mainly solved by numerical simulation and analytical methods. When solving the electromagnetic problem of the generator by analytical method, it is impossible to directly calculate the influence of ferromagnetic media such as the stator core and the rotor core on the magnetic field. At the same time, a lot of simplifications and assumptions are made to the calculation model, and the actual volume of the generator cannot be considered. Therefore, the analytical method has certain limitations and low calculation accuracy. The finite element method in the numerical simulation method can effectively solve the problems existing in the analytical method, and this method can adapt to the different boundaries of the field to be solved, which is convenient for handling various complex physical field problems, with high standardization and high accuracy. The electromagnetic vibration calculation of the generator end winding is mainly solved by numerical simulation method. The electromagnetic vibration calculation is performed by combining the electromagnetic simulation software and the vibration simulation software module. Due to the difference in the grid division rules of the two software, this method leads to poor mapping effect of electromagnetic force and low calculation accuracy. The vibration calculation of electromagnetic force is loaded in the form of node force to solve the error caused by grid difference. The generator end structure is complex, and the various components and supporting structures have a great influence on the force and vibration of the end winding. For units that have not been put into operation, it is very meaningful to calculate and analyze the electromagnetic force on the stator end winding in advance and fix the end structure reasonably to improve the operating reliability of the generator. For units that have been put into operation, the vibration of the end can be estimated by analyzing the electromagnetic force characteristics of the end winding. SUMMARY OF THE INVENTION

[0004] In view of this, the purpose of this invention is to obtain the distribution of radial electromagnetic force density, tangential electromagnetic force density, axial electromagnetic force density and combined electromagnetic force density of the stator end winding under different working conditions, study the force characteristics of electromagnetic force at different positions of the winding bar, and obtain the overall vibration and stress amplitude through the response analysis under the action of electromagnetic force.

[0005] To achieve the above purpose, one aspect of the present invention provides a method for calculating the electromagnetic vibration of the stator end of a generator, which is used to accurately calculate the vibration amplitude and stress amplitude of the stator end winding under different working conditions, and is characterized in that it includes the following steps:

[0006] S1: According to the geometric model of the generator end and the given parameters, a three-dimensional electromagnetic force simulation analysis finite element model of the generator end area is established in the electromagnetic simulation software;

[0007] S2: Establish corresponding excitation sources according to the armature current and excitation current parameters under different working conditions, and calculate the electromagnetic force density distribution of the stator end winding;

[0008] S3: Import the stator end geometry model into the vibration simulation software to divide the nodes of all the bars in the stator end winding, and obtain the node information of the stator end winding;

[0009] S4: Obtain the electromagnetic force at the nodes of the stator end winding based on the electromagnetic force density distribution of the stator end winding under different working conditions and the node information of the stator end winding;

[0010] S5: In the vibration simulation software, load the electromagnetic force at the nodes of the stator end winding onto the stator end winding in the form of nodal forces, establish a finite element model for three-dimensional vibration analysis of the generator stator end winding, and calculate the vibration amplitude and stress amplitude of the generator stator end winding under different working conditions.

[0011] Preferably, establishing the finite element model for three-dimensional electromagnetic force simulation analysis of the generator end region in the electromagnetic simulation software includes:

[0012] S11: Import the established generator end geometry model into the electromagnetic simulation software. Since the electromagnetic force distribution of the stator end winding bars is three-dimensional, the generator end geometry model adopts an overall three-dimensional modeling of the generator end;

[0013] S12: According to the electromagnetic material properties of each generator end component given, assign corresponding materials to the stator winding, stator core, rotor winding, damper, rotor core, copper shield, retaining ring, and finger; set the circuit excitation according to the given current parameters;

[0014] S14: According to the rotational speed of the generator, the shaft, and the initial position, set the Band domain and MotionSetup parameters in the operating boundary conditions, and set the size of the solution domain according to the shape of the generator housing;

[0015] S15: According to the shape characteristics of different generator components, perform mesh division, set the solution step size and number of steps, and obtain the finite element model for three-dimensional electromagnetic force simulation analysis of the motor end region. Among them, to reduce the eddy current loss and demagnetization effect of the stator core, set the insulation boundary condition on the surface of the stator core slots..

[0016] Preferably, establishing the corresponding excitation source for the armature current and field current parameters under different working conditions includes: setting the circuit excitation by building an external circuit to control the current magnitude in real time.

[0017] Preferably, the node information of the stator end winding obtained in step S3 specifically includes:

[0018] Import the stator end geometry model into the vibration simulation software to perform mesh division on the stator end geometry model, represent each mesh as a node, and export the coordinates of all the nodes of all the bars in the stator end winding to obtain the node information of the stator end winding.

[0019] Preferably, the electromagnetic force at the node of the stator end winding includes: extracting the electromagnetic force components of the corresponding node on the X-axis, Y-axis, and Z-axis from the electromagnetic force density distribution of the stator end winding in the electromagnetic simulation software according to the position coordinates of the node.

[0020] Preferably, in step S5, calculating the vibration amplitude and stress amplitude of the generator stator end winding includes:

[0021] S51: Using Name Select in the vibration simulation software to operationalize the nodes, and finally completing the operationalization of all nodes;

[0022] S52: After the operationalization of the nodes, according to the node information of the stator end winding, applying the electromagnetic force components of the node on the X-axis, Y-axis, and Z-axis to the node in the way of Nodal Force;

[0023] S53: According to the material properties and structural properties of each component of the stator end winding, setting the material attributes, connection relationships, and boundary constraint conditions of the corresponding structure, establishing a three-dimensional vibration analysis finite element model of the generator stator end winding, and calculating the vibration amplitude and stress amplitude of the generator stator end winding under different working conditions.

[0024] On the other hand, the present invention provides a calculation system for electromagnetic vibration of a generator stator end, which is applied to the calculation method for electromagnetic vibration of a generator stator end as described above, and includes: a first construction module, an electromagnetic force simulation module, a circuit excitation module, a node division module, an electromagnetic force extraction module, a second construction module, and an electromagnetic vibration simulation module;

[0025] The first construction module is used to establish a three-dimensional electromagnetic force simulation analysis finite element model of the generator end region in the electromagnetic simulation software according to the generator end geometric model and given parameters;

[0026] The circuit excitation module is used to establish corresponding excitation sources for armature current and field current parameters under different working conditions;

[0027] The electromagnetic force simulation module is used to calculate the electromagnetic force density distribution of the stator end winding under different working conditions;

[0028] The node division module is used to import the stator end geometric model into the vibration simulation software to divide nodes for all bars of the stator end winding, and obtain the node information of the stator end winding;

[0029] The electromagnetic force extraction module is used to extract the electromagnetic force at the nodes of the stator end winding according to the electromagnetic force density distribution of the stator end winding under different working conditions and the node information of the stator end winding;

[0030] The second construction module is used to load the electromagnetic force of the stator end winding at the node to the stator end winding in the form of nodal force in the vibration simulation software, and establish a three-dimensional vibration analysis finite element model of the generator stator end winding;

[0031] The electromagnetic vibration simulation module is used to calculate the vibration amplitude and stress amplitude of the generator stator end winding under different working conditions.

[0032] Another aspect of the present invention provides a computer-readable storage medium storing a program, which, when executed by a processor, implements the method for calculating the electromagnetic vibration of the stator end of a generator.

[0033] The present invention has at least the following beneficial effects

[0034] Compared with the existing analytical method for calculating electromagnetic force, the present invention uses the finite element method to accurately model the generator end and obtain the accurate electromagnetic force distribution of the stator end winding. The model is comprehensive and more in line with the motor operation conditions in the actual working environment, while considering the influence of leakage magnetic field and eddy current effects on electromagnetic force. Compared with the existing electromagnetic force loading method, the vibration analysis of electromagnetic force loading by node force proposed in the present invention can be applied to the application of internal force of objects. Through the one-to-one correspondence between the position of the node and the electromagnetic force, the problem of poor mapping effect in the joint module is solved. Brief Description of the Figures

[0035] Figure 1 is a flow chart of the method of the present invention;

[0036] Figure 2 This is a flow chart of the electromagnetic force finite element modeling idea of ​​the present invention;

[0037] Figure 3 The circuit diagram of the stator three-phase winding armature current using an external circuit loading excitation source in the present invention;

[0038] Figure 4 The circuit diagram of the rotor winding excitation current using an external circuit to load the excitation source of the present invention;

[0039] Figure 5 This is a schematic diagram of the simulation of the vibration amplitude and stress amplitude of the stator end winding of the generator of the present invention.

[0040] Among them, 1- stator end core, 2- stator pressure ring, 3- copper shield, 4- stator pressure finger, 5- stator end winding, 6- rotor end winding, 7- rotor end core and slot wedge, 8- air domain, 9- rotor rotation domain. Specific implementation method

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] Please refer to Figure 1 , the present invention provides a calculation method for electromagnetic vibration at the end of a generator stator, which is used to accurately calculate the vibration amplitude and stress amplitude of the stator end winding under different working conditions, and includes the following steps:

[0043] S1: According to the geometric model of the generator end and the given parameters, establish a three-dimensional electromagnetic force simulation analysis finite element model of the generator end region in the electromagnetic simulation software;

[0044] Furthermore, the establishment of the three-dimensional electromagnetic force simulation analysis finite element model of the generator end region in the electromagnetic simulation software includes:

[0045] S11: Import the established geometric model of the generator end into the electromagnetic simulation software. Since the electromagnetic force distribution of the stator end winding bars is three-dimensional, the overall three-dimensional modeling of the generator end is adopted for the geometric model of the generator end;

[0046] S12: According to the electromagnetic material properties of each component at the generator end given, assign corresponding materials to the stator winding, stator core, rotor winding, damper, rotor core, copper shield, retaining ring and finger plate; set the circuit excitation according to the given current parameters;

[0047] S14: Set the Band domain and Motion Setup parameters in the operating boundary conditions according to the rotational speed of the generator, the shaft and the initial position, and set the size of the solution domain according to the shape of the generator housing;

[0048] S15: Perform mesh division according to the shape characteristics of different components of the generator, set the solution step size and number of steps to obtain a three-dimensional electromagnetic force simulation analysis finite element model of the motor end region. Among them, to reduce the eddy current loss and demagnetization effect of the stator core, an insulating boundary condition is set on the surface of the stator core slots. As Figure 2 shown, the three-dimensional electromagnetic force simulation analysis finite element model includes: stator end core 1, stator retaining ring 2, copper shield 3, stator finger plate 4, stator end winding 5, rotor end winding 6, rotor end core and slot wedge 7, air domain 8, rotor rotation domain 9.

[0049] Preferably, the Band domain is the size of the area where the rotor rotates; Motion Setup is to set the rotational speed and the shaft.

[0050] S2: Establish corresponding excitation sources according to the armature current and field current parameters under different working conditions, and calculate the electromagnetic force density distribution of the stator end winding;

[0051] Further, the establishment of corresponding excitation sources according to the armature current and field current parameters under different working conditions includes: adopting the form of building an external circuit to control the current magnitude in real time to set the circuit excitation. Please refer to Figure 3 and Figure 4 , adopting the form of building an external circuit to determine the current magnitude, and loading the current excitation onto the corresponding structure in the three-dimensional electromagnetic force simulation analysis finite element model to calculate the electromagnetic force density distribution of the stator end winding. As shown in Figure 3 , where LA, LB, and LC are the stator three-phase windings, RA, RB, and RC are the resistance values of the stator three-phase windings in each direction, IA, IB, and IC are the armature alternating currents, and the switches W_S1 and W_S2 can change the current magnitude under different working conditions of the armature current. As shown in Figure 4 , where Lrotor is the rotor winding, Rf is the resistance value of the rotor winding, the R field suppression winding plays a role in preventing overvoltage during sudden short circuit, IIf is the field DC current, and the switch W_S3 can change the current magnitude under different working conditions of the field current. When operating under the rated load condition, the switches W_S1, W_S2, and W_S3 are not closed, and the three switches are instantaneously closed at the moment of three-phase short circuit;

[0052] S4: Import the stator end geometric model into the vibration simulation software to divide the nodes of all the bars of the stator end winding, and obtain the node information of the stator end winding;

[0053] Preferably, obtaining the node information of the stator end winding in step S4 specifically includes: importing the stator end geometric model into the vibration simulation software to perform mesh division on the stator end geometric model, representing each mesh as a node, and exporting the coordinates of all the nodes of all the bars of the stator end winding to obtain the node information of the stator end winding.

[0054] S5: Obtain the electromagnetic force at the nodes of the stator end winding according to the electromagnetic force density distribution of the stator end winding under different working conditions and the node information of the stator end winding;

[0055] Preferably, the electromagnetic force at the nodes of the stator end winding includes: extracting the electromagnetic force components of the corresponding nodes on the X-axis, Y-axis, and Z-axis from the electromagnetic force density distribution of the stator end winding in the electromagnetic simulation software according to the position coordinates of the nodes.

[0056] S5: In the vibration simulation software, load the electromagnetic force at the nodes of the stator end winding onto the stator end winding in the form of nodal force, establish a finite element model for three-dimensional vibration analysis of the generator stator end winding, and calculate the vibration amplitude and stress amplitude of the generator stator end winding under different working conditions;

[0057] Preferably, in step S5, calculating the vibration amplitude and stress amplitude of the generator stator end winding includes:

[0058] S51: In the vibration simulation software, perform operable processing on the nodes using Name Select, and finally complete the operable processing of all nodes;

[0059] S52: After the operable processing of the nodes, according to the node information of the stator end winding, apply the electromagnetic force components of the nodes on the X-axis, Y-axis, and Z-axis to the node in the way of Nodal Force;

[0060] S53: According to the material properties and structural characteristics of each component of the stator end winding, set the material properties, connection relationships, and boundary constraint conditions of the corresponding structure, establish a finite element model for three-dimensional vibration analysis of the generator stator end winding, and calculate the vibration amplitude and stress amplitude of the generator stator end winding under different working conditions.

[0061] Based on the same idea as a calculation method for electromagnetic vibration at the end of a generator stator in the above embodiment, the present invention also provides a calculation system for electromagnetic vibration at the end of a generator stator. This system can be used to execute the above calculation method for electromagnetic vibration at the end of a generator stator, and includes: a first construction module, an electromagnetic force simulation module, a circuit excitation module, a node division module, an electromagnetic force extraction module, a second construction module, and an electromagnetic vibration simulation module;

[0062] The first construction module is used to establish a finite element model for three-dimensional electromagnetic force simulation analysis of the generator end region in the electromagnetic simulation software according to the generator end geometric model and given parameters;

[0063] The circuit excitation module is used to establish corresponding excitation sources for armature current and field current parameters under different working conditions;

[0064] The electromagnetic force simulation module is used to calculate the electromagnetic force density distribution of the stator end winding under different working conditions;

[0065] The node division module is used to import the stator end geometric model into the vibration simulation software to divide nodes for all the bars of the stator end winding, and obtain the node information of the stator end winding;

[0066] The electromagnetic force extraction module is used to extract the electromagnetic force at the nodes of the stator end winding according to the electromagnetic force density distribution of the stator end winding under different working conditions and the node information of the stator end winding;

[0067] The second construction module is used to load the electromagnetic force at the nodes of the stator end winding onto the stator end winding in the form of nodal forces in the vibration simulation software, and establish a finite element model for three-dimensional vibration analysis of the generator stator end winding;

[0068] The electromagnetic vibration simulation module is used to calculate the vibration amplitude and stress amplitude of the generator stator end winding under different working conditions.

[0069] It should be noted that a calculation system for electromagnetic vibration of a generator stator end of the present invention corresponds one-to-one with a calculation method for electromagnetic vibration of a generator stator end of the present invention. The technical features and beneficial effects described in the embodiments of the above-mentioned calculation method for electromagnetic vibration of a generator stator end are all applicable to the embodiments of a calculation system for electromagnetic vibration of a generator stator end. For specific content, reference can be made to the description in the method embodiments of the present invention, which will not be elaborated here. This is hereby declared.

[0070] In addition, in the implementation manner of a calculation system for electromagnetic vibration of a generator stator end in the above embodiments, the logical division of each program module is only an example. In actual applications, according to needs, for example, considering the configuration requirements of corresponding hardware or the convenience of software implementation, the above functions can be assigned to different program modules to complete, that is, the internal structure of the calculation system for electromagnetic vibration of a generator stator end is divided into different program modules to complete all or part of the functions described above.

[0071] In one embodiment, the present invention provides a computer-readable storage medium storing a program in a memory. When the program is executed by a processor, it implements the above-mentioned method for calculating electromagnetic force under acceleration and deceleration conditions of a permanent magnet synchronous motor, specifically including:

[0072] S1: According to the geometric model of the generator end and given parameters, establish a finite element model for three-dimensional electromagnetic force simulation analysis of the generator end region in electromagnetic simulation software;

[0073] S2: Establish corresponding excitation sources for armature current and field current parameters under different working conditions, and calculate the electromagnetic force density distribution of the stator end winding;

[0074] S3: Import the stator end geometric model into vibration simulation software to divide nodes for all the bars of the stator end winding, and obtain the node information of the stator end winding;

[0075] S4: Obtain the electromagnetic force at the nodes of the stator end winding based on the electromagnetic force density distribution of the stator end winding under different working conditions and the node information of the stator end winding.

[0076] S5: In the vibration simulation software, load the electromagnetic force at the nodes of the stator end winding onto the stator end winding in the form of nodal forces, establish a finite element model for three-dimensional vibration analysis of the generator stator end winding, and calculate the vibration amplitude and stress amplitude of the generator stator end winding under different working conditions.

[0077] The present invention provides a specific implementation manner. First, in the Maxwell 3D Design module of the ANSYS Electronics Desktop electromagnetic simulation software, establish a finite element model for three-dimensional electromagnetic force simulation analysis of the generator end region according to the generator end geometric model and given parameters. In the Maxwell Circuit Design module, build the armature current and excitation electromagnetic circuit excitation modules under different working conditions to obtain the electromagnetic force of the stator end winding under different working conditions. Secondly, in the Transient Structural module of the ANSYS Workbench vibration simulation software, import the stator end geometric model and perform mesh division on the stator end winding to obtain the node information of the stator end winding. Then, according to the obtained node information, extract the electromagnetic force at the nodes of the stator end winding under different working conditions in the Maxwell 3D Design module of the ANSYS Electronics Desktop electromagnetic simulation software. Finally, in the Transient Structural module of the ANSYS Workbench vibration simulation software, load the electromagnetic force at the nodes of the stator end winding onto the stator end winding in the form of nodal forces, and set the material properties, connection relationships, and boundary constraint conditions to complete the establishment of a finite element model for three-dimensional vibration analysis of the generator stator end winding, and obtain the vibration amplitude and stress amplitude of the generator stator end winding under different working conditions, as Figure 5 shown.

[0078] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0079] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A method for calculating electromagnetic vibration of a generator stator end, used to accurately calculate the vibration amplitude and stress amplitude of the stator end winding under different working conditions, characterized in that: The following steps are involved: S1: According to the geometric model of the generator end and given parameters, a three-dimensional electromagnetic force simulation analysis finite element model of the generator end area is established in the electromagnetic simulation software; The method of establishing a three-dimensional electromagnetic force simulation analysis finite element model for the generator end region in the electromagnetic simulation software includes: S11: Import the built generator end geometry model into the electromagnetic simulation software. Since the electromagnetic force distribution of the stator end winding bar is three-dimensional, the generator end geometry model adopts the overall three-dimensional modeling of the generator end; S12: according to the given electromagnetic material characteristics of each generator end component, the stator winding, stator core, rotor winding, damping, rotor core, copper shield, pressure ring and pressure finger are given corresponding materials; according to the given current parameters, circuit excitation is set; S14: According to the rotation speed, shaft and initial position of the generator, set the Band domain and MotionSetup parameters in the operating boundary conditions, and according to the shape of the generator shell, set the size of the solution domain; S15: According to the shape characteristics of different components of the generator, meshing is performed, and the solution step size and number of steps are set to obtain a three-dimensional electromagnetic force simulation analysis finite element model of the motor end area; S2: Establish corresponding excitation sources according to the armature current and excitation current parameters of different working conditions, and calculate the electromagnetic force density distribution of the stator end winding; S3: Import the stator end geometric model into the vibration simulation software to perform node division on all the wire bars of the stator end winding to obtain the node information of the stator end winding; S4: obtaining the electromagnetic force of the stator end winding at the node according to the electromagnetic force density distribution of the stator end winding under different working conditions and the node information of the stator end winding; S5: In the vibration simulation software, the electromagnetic force of the stator end winding at the node is loaded onto the stator end winding in the form of nodal force, a three-dimensional vibration analysis finite element model of the generator stator end winding is established, and the vibration amplitude and stress amplitude of the generator stator end winding under different working conditions are calculated.

2. The method for calculating the electromagnetic vibration of the stator end of a generator according to claim 1, characterized in that: The establishment of corresponding excitation sources according to the armature current and excitation current parameters of different working conditions includes: setting up circuit excitation by controlling the current size in real time in the form of building an external circuit.

3. The method for calculating the electromagnetic vibration of the stator end of a generator according to claim 1, characterized in that: Obtaining the node information of the stator end winding in step S3 specifically includes: The stator end geometric model is imported into the vibration simulation software to mesh the stator end geometric model, each mesh is represented as a node, and the coordinates of all nodes of all wire bars of the stator end winding are exported to obtain the node information of the stator end winding.

4. The method for calculating the electromagnetic vibration of the stator end of a generator according to claim 2, characterized in that: The electromagnetic force of the stator end winding at the node includes: extracting the electromagnetic force components of the corresponding node on the X axis, Y axis and Z axis in the electromagnetic force density distribution of the stator end winding in the electromagnetic simulation software according to the position coordinates of the node.

5. The method for calculating the electromagnetic vibration of the stator end of a generator according to claim 3, characterized in that: In step S5, calculating the vibration amplitude and stress amplitude of the stator end winding of the generator includes: S51: Use Name Select in the vibration simulation software to process the nodes in an operational way, and finally complete the operational processing of all nodes; S52: After the operationalization processing of the node is completed, the electromagnetic force components of the node in the X-axis, Y-axis and Z-axis are applied to the node in the form of Nodal Force according to the node information of the stator end winding; S53: According to the material properties and structural properties of each component of the stator end winding, the material properties, connection relationships and boundary constraints of the corresponding structure are set, a three-dimensional vibration analysis finite element model of the generator stator end winding is established, and the vibration amplitude and stress amplitude of the generator stator end winding under different working conditions are calculated.

6. A calculation system for electromagnetic vibration of a generator stator end, characterized in that: A method for calculating electromagnetic vibration of a stator end of a generator as described in any one of claims 1 to 5, comprising: a first construction module, an electromagnetic force simulation module, a circuit excitation module, a node division module, an electromagnetic force extraction module, a second construction module and an electromagnetic vibration simulation module; The first building module is used to establish a three-dimensional electromagnetic force simulation analysis finite element model of the generator end area in the electromagnetic simulation software according to the generator end geometric model and given parameters; The circuit excitation module is used to establish corresponding excitation sources according to the armature current and excitation current parameters of different working conditions; The electromagnetic force simulation module is used to calculate the electromagnetic force density distribution of the stator end winding under different working conditions; The node division module is used to import the stator end geometric model into the vibration simulation software to perform node division on all the wire rods of the stator end winding to obtain the node information of the stator end winding; The electromagnetic force extraction module is used to extract the electromagnetic force of the stator end winding at the node according to the electromagnetic force density distribution of the stator end winding under different working conditions and the node information of the stator end winding; The second building module is used to load the electromagnetic force of the stator end winding at the node to the stator end winding in the form of nodal force in the vibration simulation software, and establish a three-dimensional vibration analysis finite element model of the generator stator end winding; The electromagnetic vibration simulation module is used to calculate the vibration amplitude and stress amplitude of the stator end winding of the generator under different working conditions.

7. A computer-readable storage medium storing a program, characterized in that: When the program is executed by a processor, a method for calculating electromagnetic vibration of a stator end of a generator as described in any one of claims 1 to 5 is implemented.

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