CN-122021165-A - S-N curve-based reactor multi-field coupling vibration fatigue simulation method and system

CN122021165ACN 122021165 ACN122021165 ACN 122021165ACN-122021165-A

Abstract

The invention discloses a multi-field coupling vibration fatigue simulation method and a system of a reactor based on an S-N curve, which belong to the technical field of power equipment fatigue simulation and comprise the steps of obtaining structural parameters and material parameters of a target reactor, and establishing a parameterized physical model comprising an iron core, a winding and an insulating component; based on a parameterized physical model of the target reactor, simulating time-varying mechanical force in the target reactor under rated power frequency current excitation, calculating vibration response of each component of the target reactor according to the time-varying mechanical force, extracting alternating stress distribution of each component of the target reactor under steady-state operation conditions, analyzing the alternating stress distribution by adopting a linear accumulated damage theory based on a material S-N curve of each component of the target reactor, and calculating failure cycle times and fatigue life of each component under preset cyclic load. According to the invention, through multi-field coupling simulation and S-N curve analysis, the prediction of the fatigue life of the reactor is realized, and a basis is provided for preventive maintenance.

Inventors

ZHANG XIAOKE
ZHANG SHAOFENG
You shun
XU PENGYU
WANG FANGFANG
ZHANG ZHUANGZHUANG
MA PENGYU
WANG DONGHUI

Assignees

国网河南省电力公司电力科学研究院
国家电网有限公司

Dates

Publication Date: 20260512
Application Date: 20260202

Claims (10)

1. A reactor multi-field coupling vibration fatigue simulation method based on an S-N curve is characterized by comprising the following steps: obtaining structural parameters and material parameters of a target reactor, and establishing a parameterized physical model of the target reactor, wherein the parameterized physical model comprises an iron core, a winding and an insulating component; Based on a parameterized physical model of the target reactor, simulating time-varying mechanical force which is generated in the target reactor due to electromagnetic effect and acts on an iron core and a winding of the target reactor under the excitation of rated power frequency current; According to the time-varying mechanical force, calculating the vibration response of each component of the target reactor, and extracting the alternating stress distribution of the target reactor under the steady-state operation condition; Based on the material S-N curve of each component of the target reactor, the alternating stress distribution is analyzed by adopting a linear accumulated damage theory, and the failure cycle times and the fatigue life of each component under a preset cyclic load are calculated.
2. The reactor multi-field coupling vibration fatigue simulation method based on the S-N curve according to claim 1, wherein the method is characterized by comprising the following steps of: the establishing of the parameterized physical model comprises the following steps: Constructing a finite element simulation model of the reactor based on structural parameters of the reactor, wherein the finite element simulation model at least comprises an iron core, a winding, an insulating assembly, an air gap and a fastening structure; performing grid division on the finite element simulation model, wherein a regular structure adopts a hexahedral-dominated mapping or sweeping grid division mode, and an irregular structure adopts a free tetrahedral grid division mode; Each component in the model is given material property parameters including relative permeability, poisson's ratio, young's modulus and density.
3. The reactor multi-field coupling vibration fatigue simulation method based on the S-N curve according to claim 2, wherein the method is characterized by comprising the following steps of: the finite element simulation model is coupled with the electromagnetic field module, the solid mechanics module and the fatigue module; The electromagnetic field module is used for calculating the magnetic field distribution of the target reactor under rated power frequency current; The solid mechanics module is used for calculating vibration response and alternating stress distribution of the target reactor under the action of electromagnetic force; The fatigue module is used for carrying out fatigue life analysis based on the S-N curve.
4. The reactor multi-field coupling vibration fatigue simulation method based on the S-N curve according to claim 3, wherein the method is characterized in that: The time-varying mechanical force comprises an iron core Maxwell force, an iron core magnetostriction force and a winding Lorentz force; The Maxwell force is applied to the interface between the iron core and the air gap in a boundary load mode; The magnetostriction force is simulated by setting the iron core material as a magnetostriction line elastic material and adding magnetostriction strain and damping parameters; the Lorentz force is automatically obtained based on the magnetic field distribution and the winding current density calculated by the electromagnetic field module.
5. The S-N curve-based reactor multi-field coupling vibration fatigue simulation method is characterized by comprising the following steps of: calculating the vibration response and alternating stress distribution of the target reactor includes: Converting the time domain electromagnetic field data obtained by the electromagnetic field module into a frequency domain, wherein the electromagnetic field data at least comprises magnetic field distribution and Lorentz force and Maxwell force determined by the magnetic field distribution; In the solid mechanical module, magnetostriction force is calculated based on magnetic field data of a frequency domain, and Lorentz force, maxwell force and magnetostriction force in the frequency domain are respectively applied to corresponding action parts; Calculating the vibration response of the target reactor structure under excitation by taking the applied force as excitation, wherein the vibration response at least comprises vibration acceleration and vibration displacement; And further calculating and extracting mechanical stress distribution of the target reactor under the steady-state operation working condition according to the vibration response, and taking the mechanical stress distribution as alternating stress distribution.
6. The reactor multi-field coupling vibration fatigue simulation method based on the S-N curve according to claim 1, wherein the method is characterized by comprising the following steps of: The calculation of the failure cycle times comprises the following steps: Determining cyclic loads acting on all parts of the target reactor based on alternating stress distribution, wherein the cyclic loads are superposition stresses formed by the combined action of Maxwell force, magnetostriction force and Lorentz force; and calculating the failure cycle times of each component under the cyclic load according to the S-N curve of the material of each component of the target reactor and introducing stress concentration coefficients related to the material properties, wherein the S-N curve is determined by adopting an extrapolation small cycle correction algorithm.
7. The S-N curve-based reactor multi-field coupling vibration fatigue simulation method is characterized by comprising the following steps of: The calculation of fatigue life includes: Acquiring the actual circulation times of each component of the target reactor under alternating stress; according to the theory of linear cumulative damage, the fatigue life of each component is calculated, which is expressed as the ratio of the actual number of cycles of the component to the number of cycles of failure thereof.
8. An S-N curve-based reactor multi-field coupling vibration fatigue simulation system for implementing the S-N curve-based reactor multi-field coupling vibration fatigue simulation method as set forth in any one of claims 1 to 7, comprising: The device comprises a modeling module, an electromagnetic force simulation module, a vibration response calculation module and a fatigue analysis module, wherein: the modeling module is used for acquiring the structure and material parameters of the target reactor and establishing a parameterized physical model of the target reactor; the electromagnetic force simulation module is used for simulating time-varying mechanical force which is generated by electromagnetic effect and acts on the iron core and the winding of the target reactor under the excitation of rated power frequency current based on the parameterized physical model; the vibration response calculation module is used for calculating vibration response and alternating stress distribution of each component of the target reactor according to the time-varying mechanical force; The fatigue analysis module is used for analyzing alternating stress distribution based on the S-N curve and the linear accumulated damage theory of the materials of each component of the target reactor, calculating the failure cycle times and the fatigue life of each component of the target reactor, and outputting the information of the most fatigue parts.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the computer program when loaded into the processor implements a method for simulating a reactor multi-field coupled vibration fatigue based on an S-N curve according to any of claims 1-7.
10. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements a method for simulating multi-field coupled vibration fatigue of a reactor based on an S-N curve according to any of claims 1-7.

Description

S-N curve-based reactor multi-field coupling vibration fatigue simulation method and system Technical Field The invention belongs to the technical field of power equipment fatigue simulation, and particularly relates to a reactor multi-field coupling vibration fatigue simulation method and system based on an S-N curve. Background In normal operation, the shunt reactor functions as reactive power regulation, overvoltage suppression, and the like. However, the vibration problem of the high-voltage shunt reactor cannot be avoided at present, and the high-voltage shunt reactor is repeatedly acted by Maxwell force, magnetostriction force and Lorentz force for a long time, so that structural members such as an iron core, an inner coil and a fastening bolt of the high-voltage shunt reactor are damaged until a macroscopic crack is formed. Fracture occurs when macrocracks continue to grow until they are unable to withstand peak loads. At this time, the phenomenon of ageing and fatigue loosening of materials occurs in the reactor. These phenomena further cause a decrease in the mechanical strength of the structural components of the reactor, and long-term accumulation eventually leads to severe mechanical failure of the reactor, which threatens the safe operation of the power system. The problem of vibration fatigue of reactors has been the focus of research in the relevant power equipment manufacturing departments. Therefore, the position of the reactor with reduced mechanical strength under repeated stress is clarified, and the mechanical fatigue position is further determined, so that reliable reference value can be provided for the follow-up identification of related mechanical states and the targeted fault diagnosis. At present, a relatively complete research system is provided for the fatigue detection distribution of traditional machines such as turbine blades, space engines and the like, but the mechanical fatigue research of the shunt reactor is not deeply carried out. During normal operation, the internal structure of the reactor box is complex, the material parameter difference is large, the propagation path of vibration is complex, and if the periodic vibration rule of each structure of the reactor is required to be obtained, the mode of test measurement is not realistic. Disclosure of Invention In order to solve the defects in the prior art, the invention provides a reactor multi-field coupling vibration fatigue simulation method and system based on an S-N curve. By long-term repetition and mutually independent stress circulation and combining an S-N curve of a material, the failure cycle number and the fatigue life of a structural member of the reactor are estimated according to a linear accumulated damage theory, and the specific part of the reactor, which is most prone to mechanical fatigue in normal operation, is determined. The invention adopts the following technical scheme. The invention provides a reactor multi-field coupling vibration fatigue simulation method based on an S-N curve, which comprises the following steps: obtaining structural parameters and material parameters of a target reactor, and establishing a parameterized physical model of the target reactor, wherein the parameterized physical model comprises an iron core, a winding and an insulating component; Based on a parameterized physical model of the target reactor, simulating time-varying mechanical force which is generated in the target reactor due to electromagnetic effect and acts on an iron core and a winding of the target reactor under the excitation of rated power frequency current; According to the time-varying mechanical force, calculating the vibration response of each component of the target reactor, and extracting the alternating stress distribution of the target reactor under the steady-state operation condition; Based on the material S-N curve of each component of the target reactor, the alternating stress distribution is analyzed by adopting a linear accumulated damage theory, and the failure cycle times and the fatigue life of each component under a preset cyclic load are calculated. Optionally, establishing the parameterized physical model includes: Constructing a finite element simulation model of the reactor based on structural parameters of the reactor, wherein the finite element simulation model at least comprises an iron core, a winding, an insulating assembly, an air gap and a fastening structure; performing grid division on the finite element simulation model, wherein a regular structure adopts a hexahedral-dominated mapping or sweeping grid division mode, and an irregular structure adopts a free tetrahedral grid division mode; Each component in the model is given material property parameters including relative permeability, poisson's ratio, young's modulus and density. Optionally, the finite element simulation model couples an electromagnetic field module, a solid mechanics module, and a fatigue module; The e