Method and device for constructing rigid-flexible coupling dynamic model of circuit breaker and storage medium

Abstract

The invention relates to a rigid-flexible coupling dynamic model construction method and device of a circuit breaker and a storage medium, and belongs to the field of circuit breaker simulation testing. The method comprises the following steps: carrying out modal analysis on a circuit breaker structure, and obtaining the modal effective quality of each modal order of the circuit breaker and the modal order of each part; if the modal order of the part is smaller than or equal to k, rigid body modeling is adopted for the part; if the modal order of the part is larger than k, the structure type of the part is judged according to the proportion of the length, width and height of the part, if the part belongs to a slender type, flexible body modeling is adopted, and if the part belongs to a short and fat type, rigid body modeling is adopted; and modeling each part to obtain a rigid-flexible coupling dynamic model of the circuit breaker. The computer device comprises a memory, a processor and a computer program which is stored in the memory and is used for realizing the method. A computer program for realizing the method is stored in the storage medium. According to the method, the modeling efficiency and the calculation precision are both considered.

Description

Technical Field

[0001] The invention belongs to the field of circuit breaker simulation testing, and relates to a method, a device and a storage medium for constructing a rigid-flexible coupling dynamic model of a circuit breaker. Background Art

[0002] In the prior art, when studying the motion state of commonly used circuit breakers in power systems, three methods are generally used to obtain the relevant characteristic parameters of the circuit breaker: one is test research, which obtains the characteristic parameters of the circuit breaker operation through the test of physical quantities; the second is rigid body simulation, which obtains the motion and displacement characteristics of the circuit breaker; the third is flexible body simulation, which obtains the flexible deformation, strain stress, energy distribution and other characteristics of the circuit breaker during operation.

[0003] The above three research methods have their own focuses. Test research can obtain the real state of the circuit breaker, but the test of a certain component or a certain characteristic parameter can only obtain specific data, which is difficult to reflect the overall characteristics of the circuit breaker; rigid body simulation has fast calculation speed and high modeling efficiency, but the rigidity assumption of components has great limitations, it is difficult to evaluate strain stress, and the simulation accuracy of actual working conditions is poor; flexible body simulation is closer to the real state of components and has high simulation accuracy, but the modeling process is complicated, the calculation speed is too slow, and the modeling efficiency is low. Summary of the invention

[0004] The purpose of the present invention is to provide a method, device and storage medium for constructing a rigid-flexible coupling dynamic model of a circuit breaker, so as to solve the problem that the existing circuit breaker modeling and simulation methods are difficult to balance modeling efficiency and calculation accuracy.

[0005] The present invention provides a method for constructing a rigid-flexible coupling dynamic model of a circuit breaker to solve the above technical problems, comprising: performing modal analysis on the circuit breaker structure to obtain the modal effective mass of each order mode of the circuit breaker and the modal order of each component of the circuit breaker; if the modal order of the component is less than or equal to k, rigid body modeling is used for the component; if the modal order of the component is greater than k, the structural type of the component is judged according to the ratio of the length, width and height of the component, if the component is a slender type, flexible body modeling is used, and if it is a short and fat type, rigid body modeling is used; constructing a rigid-flexible coupling dynamic model of the circuit breaker according to the modeling method of each component of the circuit breaker; k satisfies: the sum of the modal effective masses of the first k-order modes / the total mass of the circuit breaker structure ≥ the set ratio, and the sum of the modal effective masses of the first k-1-order modes / the total mass of the circuit breaker structure < the set ratio.

[0006] Furthermore, a method for determining the structural type of a component based on the ratio of the length, width, and height of the component is as follows: obtaining the length, width, and height of the component, and comparing the three dimensions in groups of two; when the difference between at least one group of dimensions reaches a set degree, the component belongs to a slender type; otherwise, the component belongs to a short and fat type.

[0007] Furthermore, a method for judging whether the gap between a group of dimensions reaches a set degree is as follows: assuming that a group of dimensions are A and B, when A / B is less than a set ratio or B / A is less than a set ratio, it is judged that the gap between the group of dimensions reaches a set degree, and the value of the set ratio is less than or equal to 1 / 4.

[0008] Furthermore, the set ratio has a value range of 60% to 80%.

[0009] Furthermore, key components of the circuit breaker are tested and studied, the corresponding physical quantities of the key components are measured, and test data are obtained. The rigid-flexible coupling dynamic model of the circuit breaker is calibrated using the test data of each component.

[0010] Furthermore, for key components whose modal order is less than or equal to the set order, the displacement properties of the key components are tested; for key components whose modal order is greater than the set order and are of the short and fat type, the vibration acceleration of the key components is tested; for key components whose modal order is greater than the set order and are of the slender type, the strain stress values ​​of the key components are tested.

[0011] Furthermore, the method for selecting key components is: if the modal order of the component is less than or equal to k, the component is a key component; if the modal order of the component is greater than k, it is determined whether the component is a basic support component and a main transmission component. If the component is a basic support component or a main transmission component, the component is a key component.

[0012] The beneficial effect of the method of the present invention is that the construction method of the present invention reasonably distributes the modeling efficiency and the calculation accuracy, so that the two reach an optimal balance state. It not only has high simulation efficiency and ensures calculation accuracy, but also provides guidance for the study of the motion state of the circuit breaker, and has high practical engineering application value.

[0013] The computer device provided by the present invention to solve the above technical problems includes a memory, a processor and a computer program stored in the memory, and the processor executes the computer program to implement the above-mentioned method for constructing a rigid-flexible coupling dynamic model of a circuit breaker.

[0014] The beneficial effect of the device of the present invention is that when the computer device of the present invention constructs the rigid-flexible coupling dynamic model of the circuit breaker, the modeling efficiency and the calculation accuracy are reasonably distributed, so that the two reach an optimal balance state. Not only is the simulation efficiency high and the calculation accuracy is guaranteed, but also it provides guidance for the study of the motion state of the circuit breaker and has a high practical engineering application value.

[0015] In order to solve the above technical problems, the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method for constructing a rigid-flexible coupling dynamic model of a circuit breaker described above is implemented.

[0016] The beneficial effect of the computer-readable storage medium of the present invention is that when realizing the construction of the rigid-flexible coupling dynamic model of the circuit breaker, the modeling efficiency and the calculation accuracy are reasonably allocated so that the two reach an optimal balance state, which not only has high simulation efficiency and ensures calculation accuracy, but also provides guidance for the study of the motion state of the circuit breaker and has high practical engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of a method for constructing a rigid-flexible coupling dynamic model of a circuit breaker according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0019] The basic idea of ​​the present invention is to establish a joint simulation model of rigid body and flexible body according to the mechanical and deformation characteristics of components during circuit breaker operation, so as to reasonably allocate modeling efficiency and calculation accuracy to achieve the optimal balance state, thereby optimizing the existing research method of the motion state of circuit breaker.

[0020] Example 1

[0021] Based on the above basic ideas, Figure 1 As shown, the rigid-flexible coupling dynamic model construction method of the circuit breaker of the present invention includes: performing modal calculation on the circuit breaker structure, obtaining the modal order of each component of the circuit breaker, if the modal order of the component is less than or equal to k, rigid body modeling is used for the component; if the modal order of the component is greater than k, the structural type of the component is judged according to the ratio of the length, width and height of the component, if the component is a slender type, flexible body modeling is used, if it is a short and fat type, rigid body modeling is used; rigid body modeling is used; according to the modeling method of each component of the circuit breaker, the rigid-flexible coupling dynamic model of the circuit breaker is constructed. k satisfies: the sum of the modal effective mass of the first k-order modes / the total mass of the circuit breaker structure ≥ the set ratio, and the sum of the modal effective mass of the first k-1-order modes / the total mass of the circuit breaker structure < the set ratio.

[0022] Preferably, the value range of the set ratio is 60% to 80%. When the set ratio is 80%, it is a stricter standard, and when the set ratio is 60%, it is a looser standard.

[0023] Modal analysis is a common structural dynamics analysis method in this field. The modal characteristics of the circuit breaker structure can be quickly obtained through modal analysis. Modal analysis belongs to the prior art. General commercial simulation software can perform modal calculations, such as ANSYS, COMSOL and other software; rigid body modeling and flexible modeling also belong to the prior art, which can be achieved using existing dynamic calculation software, such as Lsdyna and other software. Circuit breakers are subject to short-term impact forces, and the use of Lsdyna software is currently a more mature technology, so Lsdyna software is preferred in this embodiment.

[0024] The first k-order modes are generally the basic modes of the structure, which are determined by the largest mass part of the structure, that is, they represent the dynamic characteristics of the structural foundation. The present invention first calculates the modal characteristics of the circuit breaker, and determines which components belong to the first k-order modal vibration by checking the vibration morphology of the first k orders. For the components of the first k-order modes, their displacement characteristics are mainly considered, and their displacement is analyzed to see whether it deviates from the design basis. When modeling, they are modeled as rigid bodies. From the perspective of vibration morphology, for components with modal orders higher than the k-order, their structural characteristics are also identified, and the structural type of the component is determined to be "short and fat" or "slender" based on the proportions of the three dimensions of length, width, and height. If the component is of the "slender" type, flexible body modeling is performed on the component, and if the component is of the "short and fat" type, rigid body modeling is performed.

[0025] As a preferred implementation, a method for determining the structural type of a component based on the ratio of the length, width, and height of the component is as follows: the length, width, and height of the component are obtained, and the three dimensions are compared in groups of two. When the difference between at least one group of dimensions reaches a set degree, the component belongs to a slender type, otherwise the component belongs to a short and fat type.

[0026] Preferably, the method for judging whether the gap between a group of dimensions reaches a set degree is: assuming that a group of dimensions are A and B, when A / B is less than a set ratio or B / A is less than a set ratio, it is judged that the gap between the group of dimensions reaches the set degree.

[0027] Assuming that the set ratio is represented by m, when two of the three dimensions of length, width and height are compared with each other and the ratio is less than m, the component is considered to be "slender" type, otherwise the component is considered to be "short and fat" type. Preferably, the set ratio m is set according to the actual structure of the circuit breaker. In general, the value of the set ratio m is less than or equal to 1 / 4, such as 1 / 5, 1 / 6, etc. For example, when the set ratio is 1 / 5, the length and width of a certain component of the circuit breaker are not much different, but the height is obviously different from the length and width, that is, the length-to-height ratio is less than 1 / 5 or the width-to-height ratio is less than 1 / 5, then the component is considered to be slender. For example, if the ratio of any two of the three dimensions of length, width and height of a certain component of the circuit breaker is greater than 1 / 5 after pairwise comparison, the component is considered to be short and fat.

[0028] Preferably, when the ratio is greater than 1 / 4, the component can be considered as a "short and fat" type, and when the ratio is less than 1 / 8, it can be considered as a "slender" type; and components with a ratio between 1 / 8 and 1 / 4 can be selected based on the complex structure of the model.

[0029] As another implementation, the two dimensions of each group may be subtracted. If the absolute value of the difference is greater than the set difference, it is determined that the difference between the dimensions of the group has reached the set degree. For example, if the length and width of a certain component of the circuit breaker are not much different, but the height is obviously different from the length and width, it will be determined that |length-height|>set difference or |width-height|>set difference, and it is considered that the difference between the dimensions of the group has reached the set degree, and the component is slender. For each component, the size of the component is different, so the set difference is also different. This difference judgment method requires setting a set difference for each component, so it is relatively complicated, so this embodiment preferably uses a ratio method for judgment.

[0030] As a preferred implementation, the present invention also tests and studies key components of the circuit breaker, measures corresponding physical quantities of the key components, obtains test data, and uses the test data of each component to calibrate the rigid-flexible coupling dynamic model of the circuit breaker.

[0031] The method for selecting key components is: first judge from the modal point of view. If the modal order of the component is less than or equal to k, the component is a key component. If the modal order of the component is greater than k, then judge from the structural function whether the component is a basic support component and a main transmission component. If the component is a basic support component or a main transmission component, the component is a key component.

[0032] Preferably, for key components whose modal order is less than or equal to k, a displacement test is performed on them to measure the displacement properties of the key components; for key components whose modal order is greater than k and are of the short and fat type, a vibration acceleration test is performed to measure the vibration acceleration of the key components; for key components whose modal order is greater than k and are of the slender type, a strain stress test is performed to measure the strain stress values ​​of the key components.

[0033] When testing and studying key components, the function and stress state of the components should be considered; for example, for the circuit breaker cylinder, it is mainly used to achieve basic support, and its strain stress is generally not evaluated through dynamic calculations. Displacement tests can be performed to understand the basic displacement of the entire system; for example, for the drive mechanism frame, it is mainly used to achieve support and fixation, and its displacement deformation and acceleration need to be tested; for example, for the transmission crank arm, its strain stress needs to be tested.

[0034] After obtaining the characteristic physical quantity test data of each key component (typical component), the rigid-flexible coupling dynamic model of the circuit breaker is corrected. For example, if the actual test displacement of the key component of the circuit breaker does not match the simulation test data of the component in the rigid-flexible coupling dynamic model obtained by modeling, it is considered that the modeling method of the component is inappropriate, and its modeling method is adjusted (from rigid body modeling to flexible body modeling, or from flexible body modeling to rigid body modeling). Therefore, based on the actual measured physical quantities, the model can be quickly simulated and evaluated to form a fast simulation model of rigid-flexible coupling based on test data. Moreover, based on the test data, it can also solve the problem of rapid evaluation of mechanical characteristics during circuit breaker operation, and the solution to the mechanical problem of the circuit breaker has high practical engineering value.

[0035] Example 2

[0036] The computer device of the present invention includes a memory, a processor, and a computer program stored in the memory, and the processor is used to execute the computer program to implement a method for constructing a rigid-flexible coupling dynamic model of a circuit breaker. The construction method is the method for constructing a rigid-flexible coupling dynamic model of a circuit breaker described in Example 1. For specific contents, see Example 1, which will not be described in detail here.

[0037] Example 3

[0038] The computer-readable storage medium of the present invention stores a computer program thereon, and when the computer program is executed by a processor, a method for constructing a rigid-flexible coupling dynamic model of a circuit breaker is implemented. The construction method is the method for constructing a rigid-flexible coupling dynamic model of a circuit breaker described in Example 1. For details, see Example 1, and no further details are given here.

Claims

1. A method for constructing a rigid-flexible coupling dynamic model of a circuit breaker, characterized in that: The method comprises: performing modal analysis on a circuit breaker structure, obtaining modal effective masses of each order mode of the circuit breaker and the modal order of each component of the circuit breaker; if the modal order of the component is less than or equal to k, using rigid body modeling for the component; if the modal order of the component is greater than k, judging the structural type of the component according to the ratio of the length, width and height of the component, if the component is a slender type, using flexible body modeling, and if it is a short and fat type, using rigid body modeling; constructing a rigid-flexible coupling dynamic model of the circuit breaker according to the modeling method of each component of the circuit breaker; k satisfies: the sum of the modal effective masses of the first k-order modes / the total mass of the circuit breaker structure ≥ a set ratio, and the sum of the modal effective masses of the first k-1-order modes / the total mass of the circuit breaker structure < a set ratio.

2. The method for constructing a rigid-flexible coupling dynamic model of a circuit breaker according to claim 1, characterized in that: The method for judging the structural type of a component based on the ratio of the length, width and height of the component is as follows: obtain the length, width and height of the component, compare the three dimensions in groups of two, and when the difference between at least one group of dimensions reaches a set degree, the component belongs to the slender type, otherwise the component belongs to the short and fat type.

3. The method for constructing a rigid-flexible coupling dynamic model of a circuit breaker according to claim 2, characterized in that: The method for judging whether the difference between a group of dimensions reaches a set degree is as follows: assuming that a group of dimensions are A and B, when A / B is less than a set ratio or B / A is less than a set ratio, it is judged that the difference between the group of dimensions reaches a set degree, and the value of the set ratio is less than or equal to 1 / 4.

4. The method for constructing a rigid-flexible coupling dynamic model of a circuit breaker according to claim 1, characterized in that: The setting ratio has a value range of 60% to 80%.

5. The method for constructing a rigid-flexible coupling dynamic model of a circuit breaker according to claim 1, characterized in that: The key components of the circuit breaker are tested and studied, the corresponding physical quantities of the key components are measured, the test data are obtained, and the rigid-flexible coupling dynamic model of the circuit breaker is calibrated using the test data of each component.

6. The method for constructing a rigid-flexible coupling dynamic model of a circuit breaker according to claim 5, characterized in that: For key components whose modal order is less than or equal to the set order, the displacement properties of the key components are tested; for key components whose modal order is greater than the set order and are of the short and fat type, the vibration acceleration of the key components is tested; for key components whose modal order is greater than the set order and are of the slender type, the strain stress values ​​of the key components are tested.

7. The method for constructing a rigid-flexible coupling dynamic model of a circuit breaker according to claim 5, characterized in that: The method for selecting key components is: if the modal order of the component is less than or equal to k, the component is a key component; if the modal order of the component is greater than k, it is determined whether the component is a basic support component and a main transmission component. If the component is a basic support component or a main transmission component, the component is a key component.

8. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the method for constructing a rigid-flexible coupling dynamic model of a circuit breaker according to any one of claims 1 to 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for constructing a rigid-flexible coupling dynamic model of a circuit breaker according to any one of claims 1 to 7 is implemented.

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