Multistage turbine shaft system oscillation modeling method and device, electronic equipment and medium

Abstract

The invention relates to a multi-stage turbine shaft system oscillation modeling method and device, electronic equipment and a medium, and the method comprises the steps: building a compressed air energy storage system turbine side assembly-stage shaft system model; establishing a turbine side system shafting model of the compressed air energy storage system; and obtaining a matrix form of each mass block motion equation in the compressed air energy storage system according to the inertia time constant matrix, the damping coefficient matrix and the stiffness coefficient matrix of the compressed air energy storage system, and obtaining shafting oscillation characteristics of the compressed air energy storage system according to the matrix forms. According to the embodiment of the invention, a compressed air energy storage system turbine side assembly level shafting model can be established, a compressed air energy storage system shafting model is established, and according to a calculation method of the oscillation amplitude of each mass block in the system, the reliability of analyzing the shafting oscillation characteristics of the non-afterburning type compressed air energy storage system is ensured; and a theoretical foundation is laid for suppressing the shafting oscillation of the system.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a method, device, electronic equipment and medium for modeling shaft oscillation of a multi-stage turbine. Background Art

[0002] my country is making every effort to promote the construction of a new power system with new energy as the main body. However, due to the volatility and randomness of new energy such as wind power and photovoltaics, large-scale energy storage technology is needed to support the high proportion of new energy grid connection. Therefore, non-supplementary compressed air energy storage technology has developed rapidly. The power generation side of the non-supplementary compressed air energy storage system includes a multi-stage turbine structure, and each stage of the turbine is coaxially connected to the synchronous generator. When a disturbance from the mechanical side or the grid side enters the compressed air energy storage system, especially when the frequency of the disturbance is close to the natural oscillation frequency of the system shaft system, the system shaft system will experience severe oscillation.

[0003] In the related technology, it is possible to carry out modeling research on non-supplementary combustion compressed air energy storage systems from a thermodynamic perspective.

[0004] However, the relevant technology has not considered the safe and stable operation of the system from the perspective of the compressed air energy storage system shaft system, and has not considered the electromechanical coupling characteristics of the compressed air energy storage system shaft system model, resulting in serious oscillation of the system shaft system, causing serious damage to the system shaft system, and seriously affecting the safe and stable operation of the system, which urgently needs to be improved. Summary of the invention

[0005] The present application provides a multi-stage turbine shaft system oscillation modeling method, device, electronic equipment and medium to solve the problem that the related technology does not consider the safe and stable operation of the system from the perspective of the compressed air energy storage system shaft system, and does not consider the electromechanical coupling characteristics of the compressed air energy storage system shaft system model, resulting in the system shaft system being prone to serious oscillation, causing serious damage to the system shaft system, and seriously affecting the safe and stable operation of the system.

[0006] The first aspect of the present application provides a method for modeling the oscillation of a multi-stage turbine shaft system, comprising the following steps: establishing a shaft system model of a turbine-side component level of a compressed air energy storage system; based on the shaft system model of the turbine-side component level of the compressed air energy storage system, obtaining the motion equation of the compressed air energy storage system according to the electromechanical coupling characteristics of the compressed air energy storage system, and establishing a shaft system model of the turbine-side system of the compressed air energy storage system according to the motion equation; based on the shaft system model of the turbine-side system of the compressed air energy storage system, obtaining the matrix form of the motion equation of each mass block in the compressed air energy storage system according to the inertia time constant matrix, damping coefficient matrix and stiffness coefficient matrix of the compressed air energy storage system, and obtaining the shaft system oscillation characteristics of the compressed air energy storage system according to the matrix form.

[0007] Optionally, in one embodiment of the present application, the turbine-side component-level shaft system model of the compressed air energy storage system includes at least one basic component of an expander, a synchronous generator and a transmission shaft.

[0008] Optionally, in one embodiment of the present application, establishing the shaft system model of the turbine side component level of the compressed air energy storage system includes: modeling the expander and the synchronous generator to obtain a rigid concentrated mass block; modeling the transmission shaft to obtain an elastic shaft segment; and establishing the shaft system model of the turbine side component level of the compressed air energy storage system based on the rigid concentrated mass block and the elastic shaft segment.

[0009] Optionally, in one embodiment of the present application, establishing the shaft system model of the turbine side system of the compressed air energy storage system includes: establishing the shaft system model of the turbine side system of the compressed air energy storage system according to the coaxial connection structure of the rigid concentrated mass block.

[0010] Optionally, in one embodiment of the present application, the construction formula of the turbine-side component-level shaft system model of the compressed air energy storage system is:

[0011] J=∫∫∫ V r 2 dm=∫∫∫ V r 2 ρdV,

[0012] T Di =D i (ω i -ω Ni ),

[0013] T Ki-j =K i-j (θ i -θ j ),

[0014] Where r is the distance from the mass element dm to the axis of rotation, ρ is the material density, T Di is the damping torque of the i-th stage expander, D i is the damping coefficient of the i-th stage expander, ω i and ω Ni are the mechanical angular velocity and rated angular velocity of the i-th stage expander, T Ki-j is the torque transmitted between the i-th mass block and the j-th mass block, K i-j is the stiffness coefficient of the rotation axis between the i-th mass block and the j-th mass block.

[0015] Optionally, in one embodiment of the present application, the establishment of the shaft system model of the turbine side system of the compressed air energy storage system further includes: normalizing the parameters of the compressed air energy storage system to obtain normalized results; obtaining a normalized shaft system model of the compressed air energy storage system according to the normalized results; and establishing the shaft system model of the turbine side system of the compressed air energy storage system according to the normalized shaft system model of the compressed air energy storage system and the shaft system motion equation of the compressed air energy storage system.

[0016] The second aspect of the present application provides a multi-stage turbine shaft system oscillation modeling device, including: a first establishment module, used to establish a turbine-side component-level shaft system model of a compressed air energy storage system; a second establishment module, used to obtain the motion equation of the compressed air energy storage system based on the turbine-side component-level shaft system model of the compressed air energy storage system according to the electromechanical coupling characteristics of the compressed air energy storage system, and establish the turbine-side system shaft system model of the compressed air energy storage system according to the motion equation; an acquisition module, used to obtain the matrix form of the motion equation of each mass block in the compressed air energy storage system based on the turbine-side system shaft system model of the compressed air energy storage system according to the inertia time constant matrix, damping coefficient matrix and stiffness coefficient matrix of the compressed air energy storage system, and obtain the shaft system oscillation characteristics of the compressed air energy storage system according to the matrix form.

[0017] Optionally, in one embodiment of the present application, the turbine-side component-level shaft system model of the compressed air energy storage system includes at least one basic component of an expander, a synchronous generator and a transmission shaft.

[0018] Optionally, in one embodiment of the present application, the first establishing module includes: a first modeling unit, used to model the expander and the synchronous generator to obtain a rigid concentrated mass block; a second modeling unit, used to model the transmission shaft to obtain an elastic shaft segment; a first establishing unit, used to establish a turbine-side component-level shaft system model of the compressed air energy storage system based on the rigid concentrated mass block and the elastic shaft segment.

[0019] Optionally, in one embodiment of the present application, the second establishing module includes: a second establishing unit, used to establish the turbine side system shaft system model of the compressed air energy storage system according to the coaxial connection structure of the rigid concentrated mass block.

[0020] Optionally, in one embodiment of the present application, the construction formula of the turbine-side component-level shaft system model of the compressed air energy storage system is:

[0021] J=∫∫∫ V r 2 dm=∫∫∫ V r 2 ρdV,

[0022] T Di =D i (ω i -ω Ni ),

[0023] T Ki-j =K i-j (θ i -θ j ),

[0024] Where r is the distance from the mass element dm to the axis of rotation, ρ is the material density, T Di is the damping torque of the i-th stage expander, D i is the damping coefficient of the i-th stage expander, ω i and ω Ni are the mechanical angular velocity and rated angular velocity of the i-th stage expander, T Ki-j is the torque transmitted between the i-th mass block and the j-th mass block, K i-j is the stiffness coefficient of the rotation axis between the i-th mass block and the j-th mass block.

[0025] Optionally, in one embodiment of the present application, the second establishing module also includes: a processing unit, used to perform normalization processing on the parameters of the compressed air energy storage system to obtain normalization processing results; an acquisition unit, used to obtain a normalized shaft system model of the compressed air energy storage system according to the normalization processing results; a third establishing unit, used to establish the turbine side system shaft system model of the compressed air energy storage system according to the normalized shaft system model of the compressed air energy storage system and the shaft system motion equation of the compressed air energy storage system.

[0026] The third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the multi-stage turbine shaft oscillation modeling method as described in the above embodiment.

[0027] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned multi-stage turbine shaft system oscillation modeling method.

[0028] A fifth aspect of the present application provides a computer program product, which stores a computer program that, when executed by a processor, implements the above-mentioned multi-stage turbine shaft system oscillation modeling method.

[0029] The embodiment of the present application can establish a shaft system model at the turbine side component level of the compressed air energy storage system, and establish a shaft system model of the compressed air energy storage system. According to the calculation method of the oscillation amplitude of each mass block in the system, the reliability of analyzing the shaft system oscillation characteristics of the non-supplementary compressed air energy storage system is guaranteed, thereby laying a theoretical foundation for suppressing the system shaft system oscillation. Thus, the problem that the related technology does not consider the safe and stable operation of the system from the perspective of the shaft system of the compressed air energy storage system, and does not consider the electromechanical coupling characteristics of the shaft system model of the compressed air energy storage system, resulting in the system shaft system being prone to serious oscillation phenomenon, causing serious damage to the system shaft system, and seriously affecting the safe and stable operation of the system is solved.

[0030] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0032] Figure 1 A flowchart of a method for modeling shaft oscillation of a multi-stage turbine provided according to an embodiment of the present application;

[0033] Figure 2 This is a schematic diagram of a compressed air energy storage turbine side system model including a two-stage expansion link according to an embodiment of the present application;

[0034] Figure 3 A diagram for establishing a shaft system model for a compressed air energy storage turbine side system according to an embodiment of the present application;

[0035] Figure 4 A schematic diagram of the structure of a multi-stage turbine shaft oscillation modeling device provided according to an embodiment of the present application;

[0036] Figure 5 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0038] The following describes the multi-stage turbine shaft oscillation modeling method, device, electronic device and medium of the embodiment of the present application with reference to the accompanying drawings. In view of the fact that the related technology mentioned in the above background technology does not consider the safe and stable operation of the system from the perspective of the compressed air energy storage system shaft system, does not consider the electromechanical coupling characteristics of the compressed air energy storage system shaft system model, resulting in the system shaft system prone to serious oscillation phenomenon, causing serious damage to the system shaft system, and seriously affecting the safe and stable operation of the system, the present application provides a multi-stage turbine shaft system oscillation modeling method, in which a turbine side component level shaft system model of the compressed air energy storage system can be established, and a compressed air energy storage system shaft system model can be established. According to the calculation method of the oscillation amplitude of each mass block in the system, the reliability of the analysis of the shaft system oscillation characteristics of the non-supplementary compressed air energy storage system is guaranteed, thereby laying a theoretical foundation for suppressing the system shaft system oscillation. Thus, the related technology does not consider the safe and stable operation of the system from the perspective of the compressed air energy storage system shaft system, does not consider the electromechanical coupling characteristics of the compressed air energy storage system shaft system model, resulting in the system shaft system prone to serious oscillation phenomenon, causing serious damage to the system shaft system, and seriously affecting the safe and stable operation of the system.

[0039] Specifically, Figure 1 A schematic flow chart of a method for modeling shaft oscillation of a multi-stage turbine provided in an embodiment of the present application.

[0040] like Figure 1 As shown, the multi-stage turbine shaft oscillation modeling method includes the following steps:

[0041] In step S101, a shaft system model of a turbine-side component level of a compressed air energy storage system is established.

[0042] It is understandable that the compressed air energy storage system in the embodiment of the present application can be a non-supplementary compressed air energy storage system. The power generation side of the non-supplementary compressed air energy storage system includes a multi-stage turbine structure. The turbines at each stage are coaxially connected to the synchronous generator. When affected by external disturbances, the internal units of the system may experience shaft oscillation. In order to fully study the mechanism of shaft oscillation on the power generation side of non-supplementary compressed air energy storage caused by disturbances from the mechanical side or from the power grid side, this application proposes a modeling method for multi-stage turbine shaft oscillation.

[0043] In the actual implementation process, the embodiment of the present application can establish a shaft system model at the turbine side component level of the compressed air energy storage system, thereby providing support for fully studying the shaft system oscillation mechanism of the non-supplementary compressed air energy storage power generation side caused by disturbances from the mechanical side or from the grid side, and laying a theoretical foundation for suppressing the system shaft system oscillation.

[0044] Optionally, in one embodiment of the present application, the turbine-side component-level shaft system model of the compressed air energy storage system includes at least one basic component of an expander, a synchronous generator and a transmission shaft.

[0045] As a possible way to achieve this, Figure 2 As shown, Figure 2 For a compressed air energy storage turbine-side system model including a two-stage expansion link, the embodiment of the present application can establish a component-level model including an expander, a synchronous generator, and a transmission shaft, wherein the shaft system of the compressed air energy storage system adopts a series structure, and each rotating component is connected to the same elastic shaft section at the same rated speed. Under stable operation, the speed of each turbine and synchronous generator is the same.

[0046] The embodiments of the present application can fully analyze the shaft oscillation characteristics of the non-supplementary combustion compressed air energy storage system based on the component-level model, laying a theoretical foundation for suppressing the shaft oscillation of the system.

[0047] Optionally, in one embodiment of the present application, a shaft system model of a turbine-side component level of a compressed air energy storage system is established, including: modeling the expander and the synchronous generator to obtain a rigid concentrated mass block; modeling the drive shaft to obtain an elastic shaft segment; and establishing a shaft system model of a turbine-side component level of a compressed air energy storage system based on the rigid concentrated mass block and the elastic shaft segment.

[0048] During the actual implementation process, the embodiment of the present application can model the expander and the synchronous generator as rigid concentrated mass blocks, and model the drive shaft as an elastic shaft segment, thereby establishing a turbine-side component-level shaft system model of the compressed air energy storage system including a turbine, a synchronous generator and a drive shaft based on the rigid concentrated mass blocks and the elastic shaft segments.

[0049] The embodiment of the present application can establish a component-level shaft system model on the turbine side of the compressed air energy storage system based on the component-level modeling method of the compressed air energy storage system containing a multi-stage turbine structure, so as to fully study the shaft system oscillation mechanism on the power generation side of the non-supplementary compressed air energy storage caused by disturbances from the mechanical side or from the power grid side.

[0050] Optionally, in one embodiment of the present application, the construction formula of the turbine-side component-level shaft system model of the compressed air energy storage system is:

[0051] J=∫∫∫ V r 2 dm=∫∫∫ V r 2 ρdV,

[0052] T Di =D i (ω i -ω Ni ),

[0053] T Ki-j =K i-j (θ i -θ j ),

[0054] Where r is the distance from the mass element dm to the axis of rotation, ρ is the material density, T Di is the damping torque of the i-th stage expander, D i is the damping coefficient of the i-th stage expander, ω i and ω Ni are the mechanical angular velocity and rated angular velocity of the i-th stage expander, T Ki-j is the torque transmitted between the i-th mass block and the j-th mass block, K i-j is the stiffness coefficient of the rotation axis between the i-th mass block and the j-th mass block.

[0055] Specifically, the embodiment of the present application can first establish the shaft system model of each basic component, and model the i-th stage (i=1,2) expander as a model with a rotational inertia of J i The rigid concentrated mass block is used as the modeling process. The damping effect caused by the mechanical friction of the expander and the internal high-pressure gas flow is considered, and its damping torque is considered to be proportional to the speed deviation of the expander. In the embodiment of the present application, the synchronous generator can be modeled as a rigid concentrated mass block with a moment of inertia of J3, and each rotating shaft can be modeled as an elastic shaft segment with a moment of inertia of 0, and the shaft system model of each basic component of the compressed air energy storage system can be established:

[0056] J = ∫∫∫ V r 2 dm=∫∫∫ V r 2 ρdV,(1)

[0057] T Di =D i (ω i -ω Ni ), (2)

[0058] T Ki-j =K i-j (θ i -θ j ), (3)

[0059] Wherein, formula (1) represents the calculation formula of the rotational inertia of the rigid concentrated mass block, formula (2) represents the damping effect of the expander, and formula (3) represents the equation for the torque transmitted by the transmission shaft.

[0060] The embodiment of the present application can establish a shaft system model of each basic component of the compressed air energy storage system, thereby further laying a theoretical foundation for suppressing the system shaft system oscillation.

[0061] In step S102, based on the shaft system model of the turbine side component level of the compressed air energy storage system, the motion equation of the compressed air energy storage system is obtained according to the electromechanical coupling characteristics of the compressed air energy storage system, and the shaft system model of the turbine side system of the compressed air energy storage system is established according to the motion equation.

[0062] In the actual implementation process, the embodiment of the present application can be based on the shaft system model of the turbine-side component level of the compressed air energy storage system, consider the electromechanical coupling characteristics of the non-supplementary compressed air energy storage system, obtain the motion equation of the compressed air energy storage system that can reflect the electromechanical coupling characteristics of the non-supplementary compressed air energy storage system, and establish the shaft system model of the turbine-side system of the non-supplementary compressed air energy storage system based on the motion equation.

[0063] The embodiment of the present application can establish a multi-stage turbine system model that takes into account shaft system oscillation based on the modeling method of a compressed air energy storage system containing a multi-stage turbine structure, that is, establish a shaft system model of the turbine side system of the compressed air energy storage system, thereby providing support for the subsequent calculation of the oscillation amplitude of each mass block in the system and ensuring the reliability of analyzing the shaft system oscillation characteristics of the non-supplementary combustion compressed air energy storage system.

[0064] Optionally, in one embodiment of the present application, a shaft system model of a turbine side system of a compressed air energy storage system is established, including: establishing a shaft system model of a turbine side system of a compressed air energy storage system according to a coaxial connection structure of a rigid concentrated mass block.

[0065] It is understandable that if Figure 3 As shown, Figure 3 This is the shaft system model of the compressed air energy storage turbine side system. The model includes three rigid concentrated mass blocks (i=1, 2, 3, where i=1, 2 represents the turbine and i=3 represents the synchronous generator) and two elastic shaft segments. The mass blocks are coaxially connected.

[0066] In the actual implementation process, the embodiment of the present application can establish a turbine side system shaft system model of the compressed air energy storage system based on the coaxial connection structure of the rigid centralized mass block, thereby further ensuring the reliability of analyzing the shaft system oscillation characteristics of the non-supplementary combustion compressed air energy storage system.

[0067] Optionally, in one embodiment of the present application, establishing a shaft system model for the turbine side of a compressed air energy storage system also includes: normalizing the parameters of the compressed air energy storage system to obtain normalized results; obtaining a normalized shaft system model for the compressed air energy storage system based on the normalized results; and establishing a shaft system model for the turbine side of the compressed air energy storage system based on the normalized shaft system model for the compressed air energy storage system and the shaft system motion equations for the compressed air energy storage system.

[0068] Specifically, the embodiment of the present application can perform per-unit processing on the parameters of the compressed air energy storage system to obtain a per-unit processing result, and obtain a per-unit axis model of the compressed air energy storage system according to the per-unit processing result:

[0069]

[0070]

[0071]

[0072]

[0073] Among them, * represents the per unit value, M i is the inertial time constant of each mass block, S B is the base capacity of the per-unit system, T mi is the input torque of each mass block, T em is the braking torque of the synchronous generator, formula (4) represents the calculation equation of the inertia time constant, formula (5) represents the per-unit equation of the rotation angle of each mass concentrated block, and formulas (6) and (7) represent the per-unit equation of the torque of each mass concentrated block respectively.

[0074] Furthermore, the embodiment of the present application can establish a turbine-side system shaft system model of the compressed air energy storage system based on the normalized shaft system model of the compressed air energy storage system and the shaft system motion equation of the compressed air energy storage system, thereby further laying a theoretical foundation for suppressing the system shaft system oscillation.

[0075] In step S103, based on the shaft system model of the turbine side of the compressed air energy storage system, the matrix form of the motion equations of each mass block in the compressed air energy storage system is obtained according to the inertia time constant matrix, damping coefficient matrix and stiffness coefficient matrix of the compressed air energy storage system, and the shaft system oscillation characteristics of the compressed air energy storage system are obtained according to the matrix form.

[0076] It can be understood that the system shaft system characteristic equation established in the embodiment of the present application can reflect the system shaft system oscillation characteristics, and the present application proposes a method for calculating the oscillation amplitude of each mass block in the system, which is used to analyze the shaft system oscillation characteristics of the non-supplementary compressed air energy storage system, and lay a theoretical foundation for suppressing the system shaft system oscillation.

[0077] In the actual implementation process, the embodiment of the present application can be based on the shaft system model of the turbine side system of the compressed air energy storage system, and according to the inertia time constant matrix, damping coefficient matrix and stiffness coefficient matrix of the compressed air energy storage system, establish the matrix form of the motion equations of each mass block in the compressed air energy storage system, and reflect the shaft system oscillation characteristics of the compressed air energy storage system according to the matrix form.

[0078] Among them, the system's axis motion equation satisfies:

[0079]

[0080]

[0081]

[0082]

[0083]

[0084]

[0085] Δθ=[K-ω d 2 M+jω d D] -1 ΔT, (14)

[0086] Among them, formula (8) represents the matrix form of the shaft system equation of the compressed air energy storage system, M is the inertia time constant matrix, D is the damping coefficient matrix, K is the stiffness coefficient matrix, θ is the rotation angle column vector of each rigid concentrated mass block, and T(t) is the input torque column vector of each rigid concentrated mass block. This equation can reflect the oscillation characteristics of the system shaft system. Formulas (9), (10), (11), (12) and (13) represent the contents of each vector and matrix in formula (8), and formula (14) represents the calculation formula of the rotation angle amplitude of each rigid concentrated mass block of the system.

[0087] According to the multi-stage turbine shaft oscillation modeling method proposed in the embodiment of the present application, a turbine-side component-level shaft model of the compressed air energy storage system can be established, and a compressed air energy storage system shaft model can be established. According to the calculation method of the oscillation amplitude of each mass block in the system, the reliability of analyzing the shaft oscillation characteristics of the non-supplementary compressed air energy storage system is guaranteed, thereby laying a theoretical foundation for suppressing the system shaft oscillation. Thus, the problem that the relevant technology does not consider the safe and stable operation of the system from the perspective of the compressed air energy storage system shaft, and does not consider the electromechanical coupling characteristics of the compressed air energy storage system shaft model, resulting in the system shaft being prone to serious oscillation, causing serious damage to the system shaft, and seriously affecting the safe and stable operation of the system is solved.

[0088] Next, the multi-stage turbine shaft oscillation modeling device proposed according to the embodiment of the present application will be described with reference to the accompanying drawings.

[0089] Figure 4 It is a structural schematic diagram of a multi-stage turbine shaft system oscillation modeling device according to an embodiment of the present application.

[0090] like Figure 4As shown, the multi-stage turbine shaft oscillation modeling device 10 includes: a first establishing module 100 , a second establishing module 200 and an acquiring module 300 .

[0091] Specifically, the first building module 100 is used to build a shaft system model at the turbine-side component level of the compressed air energy storage system.

[0092] The second establishment module 200 is used to obtain the motion equation of the compressed air energy storage system based on the turbine side component level shaft system model of the compressed air energy storage system according to the electromechanical coupling characteristics of the compressed air energy storage system, and establish the turbine side system shaft system model of the compressed air energy storage system according to the motion equation.

[0093] The acquisition module 300 is used to obtain the matrix form of the motion equations of each mass block in the compressed air energy storage system based on the turbine side system shaft system model of the compressed air energy storage system according to the inertia time constant matrix, damping coefficient matrix and stiffness coefficient matrix of the compressed air energy storage system, and obtain the shaft system oscillation characteristics of the compressed air energy storage system according to the matrix form.

[0094] Optionally, in one embodiment of the present application, the turbine-side component-level shaft system model of the compressed air energy storage system includes at least one basic component of an expander, a synchronous generator and a transmission shaft.

[0095] Optionally, in one embodiment of the present application, the first establishing module 100 includes: a first modeling unit, a second modeling unit and a first establishing unit.

[0096] The first modeling unit is used to model the expander and the synchronous generator to obtain a rigid concentrated mass block.

[0097] The second modeling unit is used to model the transmission shaft to obtain an elastic shaft segment.

[0098] The first establishing unit is used to establish a turbine-side component-level shaft system model of a compressed air energy storage system based on a rigid concentrated mass block and an elastic shaft segment.

[0099] Optionally, in one embodiment of the present application, the second establishing module 200 includes: a second establishing unit.

[0100] Among them, the second establishing unit is used to establish the turbine side system shaft system model of the compressed air energy storage system according to the coaxial connection structure of the rigid concentrated mass block.

[0101] Optionally, in one embodiment of the present application, the construction formula of the turbine-side component-level shaft system model of the compressed air energy storage system is:

[0102] J = ∫∫∫ V r 2 dm=∫∫∫ V r2 ρdV,

[0103] T Di =D i (ω i -ω Ni ),

[0104] T Ki-j =K i-j (θ i -θ j ),

[0105] Where r is the distance from the mass element dm to the axis of rotation, ρ is the material density, T Di is the damping torque of the i-th stage expander, D i is the damping coefficient of the i-th stage expander, ω i and ω Ni are the mechanical angular velocity and rated angular velocity of the i-th stage expander, T Ki-j is the torque transmitted between the i-th mass block and the j-th mass block, K i-j is the stiffness coefficient of the rotation axis between the i-th mass block and the j-th mass block.

[0106] Optionally, in one embodiment of the present application, the second establishing module 200 further includes: a processing unit, an acquiring unit and a third establishing unit.

[0107] The processing unit is used to perform normalization processing on the parameters of the compressed air energy storage system to obtain normalization processing results.

[0108] The acquisition unit is used to obtain the normalized shaft system model of the compressed air energy storage system according to the normalization processing result.

[0109] The third establishing unit is used to establish the turbine side system shaft system model of the compressed air energy storage system according to the normalized shaft system model of the compressed air energy storage system and the shaft system motion equation of the compressed air energy storage system.

[0110] It should be noted that the above explanation of the embodiment of the method for modeling the shaft oscillation of a multi-stage turbine is also applicable to the device for modeling the shaft oscillation of a multi-stage turbine in this embodiment, and will not be repeated here.

[0111] According to the multi-stage turbine shaft system oscillation modeling device proposed in the embodiment of the present application, a shaft system model of the turbine side component level of the compressed air energy storage system can be established, and a shaft system model of the compressed air energy storage system can be established. According to the calculation method of the oscillation amplitude of each mass block in the system, the reliability of analyzing the shaft system oscillation characteristics of the non-supplementary compressed air energy storage system is guaranteed, thereby laying a theoretical foundation for suppressing the system shaft system oscillation. Thus, the problem that the related technology does not consider the safe and stable operation of the system from the perspective of the compressed air energy storage system shaft system, and does not consider the electromechanical coupling characteristics of the compressed air energy storage system shaft system model, resulting in the system shaft system being prone to serious oscillation phenomenon, causing serious damage to the system shaft system, and seriously affecting the safe and stable operation of the system is solved.

[0112] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

[0113] A memory 501 , a processor 502 , and a computer program stored in the memory 501 and executable on the processor 502 .

[0114] When the processor 502 executes the program, the multi-stage turbine shaft oscillation modeling method provided in the above embodiment is implemented.

[0115] Furthermore, the electronic device further comprises:

[0116] The communication interface 503 is used for communication between the memory 501 and the processor 502 .

[0117] The memory 501 is used to store computer programs that can be executed on the processor 502 .

[0118] The memory 501 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0119] If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0120] Optionally, in a specific implementation, if the memory 501, the processor 502 and the communication interface 503 are integrated on a chip, the memory 501, the processor 502 and the communication interface 503 can communicate with each other through an internal interface.

[0121] The processor 502 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0122] This embodiment also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned multi-stage turbine shaft system oscillation modeling method is implemented.

[0123] This embodiment also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned multi-stage turbine shaft system oscillation modeling method is implemented.

[0124] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic 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 N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0125] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0126] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0127] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0128] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0129] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0130] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0131] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for modeling shaft oscillation of a multi-stage turbine, characterized in that: The following steps are involved: Establish the turbine-side component-level shafting model of the compressed air energy storage system; Based on the turbine-side component-level shafting model of the compressed air energy storage system, the motion equation of the compressed air energy storage system is obtained according to the electromechanical coupling characteristics of the compressed air energy storage system, and the turbine-side system shafting model of the compressed air energy storage system is established according to the motion equation; Based on the turbine side system shaft system model of the compressed air energy storage system, the matrix form of the motion equations of each mass block in the compressed air energy storage system is obtained according to the inertia time constant matrix, damping coefficient matrix and stiffness coefficient matrix of the compressed air energy storage system, and the shaft system oscillation characteristics of the compressed air energy storage system are obtained according to the matrix form.

2. The multi-stage turbine shaft oscillation modeling method according to claim 1, characterized in that: The turbine-side component-level shaft system model of the compressed air energy storage system includes at least one basic component of an expander, a synchronous generator and a transmission shaft.

3. The multi-stage turbine shaft oscillation modeling method according to claim 2, characterized in that: The establishment of the turbine-side component-level shaft system model of the compressed air energy storage system includes: Modeling the expander and the synchronous generator to obtain a rigid concentrated mass block; Modeling the transmission shaft to obtain an elastic shaft segment; A turbine-side component-level shaft system model of the compressed air energy storage system is established based on the rigid concentrated mass block and the elastic shaft segment.

4. The multi-stage turbine shaft oscillation modeling method according to claim 3, characterized in that: The establishment of the shaft system model of the turbine side system of the compressed air energy storage system includes: The turbine side system shaft system model of the compressed air energy storage system is established according to the coaxial connection structure of the rigid concentrated mass block.

5. The multi-stage turbine shaft oscillation modeling method according to claim 1, characterized in that: The construction formula of the turbine-side component-level shaft system model of the compressed air energy storage system is: J=∫∫∫ V r2dm=∫∫∫ V r2ρdV, T Di =D i (oh i -oh Ni ), T Ki-j =K i-j (i i -θ j ), Where r is the distance from the mass element dm to the axis of rotation, ρ is the material density, T Di is the damping torque of the i-th stage expander, D i is the damping coefficient of the i-th stage expander, ω i and ω Ni are the mechanical angular velocity and rated angular velocity of the i-th stage expander, T Ki-j is the torque transmitted between the i-th mass block and the j-th mass block, K i-j is the stiffness coefficient of the rotation axis between the i-th mass block and the j-th mass block.

6. The multi-stage turbine shaft oscillation modeling method according to claim 1, characterized in that: The establishment of the shaft system model of the turbine side system of the compressed air energy storage system also includes: Performing per-unit normalization processing on the parameters of the compressed air energy storage system to obtain a per-unit normalization processing result; According to the per-unit processing result, a per-unit shaft system model of the compressed air energy storage system is obtained; The turbine side system shaft system model of the compressed air energy storage system is established according to the normalized shaft system model of the compressed air energy storage system and the shaft system motion equation of the compressed air energy storage system.

7. A multi-stage turbine shaft oscillation modeling device, characterized in that: include: The first building module is used to build a turbine-side component-level shaft system model of a compressed air energy storage system; A second establishment module is used to obtain the motion equation of the compressed air energy storage system based on the turbine-side component-level shaft system model of the compressed air energy storage system according to the electromechanical coupling characteristics of the compressed air energy storage system, and establish the turbine-side system shaft system model of the compressed air energy storage system according to the motion equation; An acquisition module is used to obtain the matrix form of the motion equations of each mass block in the compressed air energy storage system based on the turbine side system shaft system model of the compressed air energy storage system according to the inertia time constant matrix, damping coefficient matrix and stiffness coefficient matrix of the compressed air energy storage system, and obtain the shaft system oscillation characteristics of the compressed air energy storage system according to the matrix form.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the multi-stage turbine shaft oscillation modeling method as described in any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the multi-stage turbine shaft oscillation modeling method as described in any one of claims 1-6.

10. A computer program product, comprising a computer program, characterized in that The computer program is executed to implement the multi-stage turbine shaft oscillation modeling method as described in any one of claims 1-6.

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