Method and device for establishing low-frequency oscillation simulation model of steam turbine unit

Abstract

The application provides a steam turbine unit low-frequency oscillation simulation model establishing method and device, the steam turbine unit low-frequency oscillation simulation model establishing method includes: generating initial valve position flow characteristic function according to the design parameters and field actual data of steam turbine unit;Synthetic valve position distribution characteristic function is generated according to the initial valve position flow characteristic function and comprehensive valve position command;The DEH control model, field equipment model and the comprehensive valve position distribution characteristic function of the steam turbine unit are used to generate the steam turbine unit low-frequency oscillation simulation model.The application solves the influence of the flow characteristics of different valves on the regulating characteristics of the unit, especially under the condition that the flow characteristic line decreases linearly, the low-frequency oscillation of the unit caused by the decrease of the steady state of the unit itself, and the problem that the low-frequency oscillation problem cannot be simulated by the model, and further provides the basis for the recurrence, positioning and solving of the problem.

Description

Technical Field

[0001] This application belongs to the field of power system automation grid-source coordination technology, specifically relating to a method and apparatus for establishing a low-frequency oscillation simulation model of a steam turbine unit. Background Technology

[0002] With the rapid development of new energy sources, a large amount of new energy power generation has been connected to the grid. Due to its randomness, intermittency, and volatility, coupled with insufficient peak-shaving capacity of the power system, grid frequency fluctuations are frequent. On the other hand, many thermal power units have undergone flexibility upgrades and are operating in deep peak-shaving ranges. Under this condition, the operating range of the main and auxiliary equipment of the units changes, the moment of inertia of the units decreases continuously, and the ability to resist disturbances decreases continuously. The simultaneous action of external or internal disturbances makes the units prone to triggering unit-level forced oscillations. In particular, in recent years, the supporting and regulating functions of thermal power units have not only failed to materialize, but have also brought huge hidden dangers to system stability, endangering the safe operation of the units and the power grid.

[0003] Low-frequency oscillations in power systems (also known as electromechanical oscillations or power oscillations) refer to the phenomenon where, when a power system is disturbed, the rotors of parallel-operating synchronous generators oscillate relative to each other, causing varying degrees of oscillation in electrical quantities such as power, voltage, and power angle. The frequency of this sustained oscillation is often between 0.2 and 2.5 Hz, hence the name low-frequency oscillation. Oscillations with frequencies between 0.2 and 0.7 Hz are called interval oscillation modes. This mode involves oscillations between two generator groups in different regions, with the oscillation power propagating throughout the system via tie lines. Interval oscillation modes generally pose a greater risk. Currently, research on low-frequency oscillations largely focuses on excitation systems and PSS systems, primarily analyzing system modeling and damping characteristics. However, for low-frequency oscillations caused by thermal power units (prime movers), there is no accurate theoretical model available, making it difficult to accurately reproduce low-frequency oscillations in prime mover-based simulations, thus hindering further research on low-frequency oscillations.

[0004] One reason for the low-frequency oscillations is the problem of the flow characteristics of the turbine valves, such as unreasonable valve flow curves, or the decline in the local linear throttling characteristics of the valves due to long-term operation and erosion. The existing simulation models do not consider the changes in valve flow characteristics, so it is impossible to reproduce and analyze the oscillation problem caused by the changes in valve flow characteristics, and therefore it is impossible to solve such problems from the perspective of theoretical models. Summary of the Invention

[0005] The method and apparatus for establishing a low-frequency oscillation simulation model of a steam turbine unit disclosed in this invention can effectively reflect the characteristics of the oscillation, such as oscillation frequency, amplitude, and oscillation start and end time, when compared with the actual simulation results, thereby accurately reflecting the unit's regulation characteristics.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] In a first aspect, the present invention provides a method for establishing a simulation model of low-frequency oscillations in a steam turbine unit, comprising:

[0008] The initial valve position flow characteristic function is generated based on the design parameters of the steam turbine unit and actual field data.

[0009] A comprehensive valve position allocation characteristic function is generated based on the initial valve position flow characteristic function and the comprehensive valve position command.

[0010] A low-frequency oscillation simulation model of the turbine unit is generated based on the DEH control model of the turbine unit, the field equipment model, and the integrated valve position allocation characteristic function.

[0011] In one embodiment, generating a low-frequency oscillation simulation model of the turbine unit based on the DEH control model of the turbine unit, the field equipment model, and the integrated valve position allocation characteristic function includes:

[0012] The flow data corresponding to each valve of the turbine unit is determined based on the comprehensive valve position allocation characteristic function.

[0013] A low-frequency oscillation simulation model of the turbine unit is generated based on the DEH control model of the turbine unit, the field equipment model, and the flow data.

[0014] In one embodiment, determining the flow data corresponding to each valve of the turbine unit based on the comprehensive valve position allocation characteristic function includes:

[0015] The actual command value corresponding to each valve of the turbine unit is determined according to the allocation function corresponding to each valve of the turbine unit;

[0016] The flow rate data corresponding to each valve of the turbine unit is determined based on the comprehensive valve position allocation characteristic function and the actual command value.

[0017] In one embodiment, the method for establishing a low-frequency oscillation simulation model for a steam turbine unit further includes:

[0018] The allocation function for each valve of the turbine unit is generated based on the design parameters of the turbine unit and the actual field data.

[0019] In one embodiment, the integrated valve position allocation characteristic function includes: a single valve position allocation characteristic function and a sequential valve position allocation characteristic function.

[0020] In one embodiment, the method for establishing a low-frequency oscillation simulation model for a steam turbine unit further includes:

[0021] The low-frequency oscillation of the turbine unit was reproduced using the simulation model of the turbine unit's low-frequency oscillation.

[0022] Secondly, the present invention provides a device for establishing a low-frequency oscillation simulation model of a steam turbine unit, the device comprising:

[0023] The initial function generation module is used to generate the initial valve position flow characteristic function based on the design parameters of the steam turbine unit and actual field data.

[0024] The integrated function generation module is used to generate an integrated valve position allocation characteristic function based on the initial valve position flow characteristic function and the integrated valve position command.

[0025] The simulation model generation module is used to generate a low-frequency oscillation simulation model of the turbine unit based on the DEH control model of the turbine unit, the field equipment model, and the integrated valve position allocation characteristic function.

[0026] In one embodiment, the simulation model generation module includes:

[0027] The flow data determination unit is used to determine the flow data corresponding to each valve of the turbine unit according to the comprehensive valve position allocation characteristic function.

[0028] The simulation model generation unit is used to generate a low-frequency oscillation simulation model of the turbine unit based on the DEH control model of the turbine unit, the field equipment model, and the flow data.

[0029] In one embodiment, the traffic data determination unit includes:

[0030] The instruction value determination unit is used to determine the actual instruction value corresponding to each valve of the turbine unit according to the allocation function corresponding to each valve of the turbine unit;

[0031] The flow data determination subunit is used to determine the flow data corresponding to each valve of the turbine unit based on the comprehensive valve position allocation characteristic function and the actual command value.

[0032] In one embodiment, the device for establishing a low-frequency oscillation simulation model of a steam turbine unit further includes:

[0033] The allocation function generation module is used to generate the allocation function corresponding to each valve of the turbine unit based on the design parameters of the turbine unit and the actual field data.

[0034] In one embodiment, the integrated valve position allocation characteristic function includes: a single valve position allocation characteristic function and a sequential valve position allocation characteristic function.

[0035] In one embodiment, the device for establishing a low-frequency oscillation simulation model of a steam turbine unit further includes:

[0036] The low-frequency oscillation reproduction module is used to reproduce the low-frequency oscillation of the turbine unit based on the turbine unit low-frequency oscillation simulation model.

[0037] Thirdly, the present invention provides an electronic device, including 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 steps of establishing a simulation model for low-frequency oscillation of a steam turbine unit.

[0038] Fourthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of a method for establishing a low-frequency oscillation simulation model of a steam turbine unit.

[0039] As described above, embodiments of the present invention provide a method and apparatus for establishing a low-frequency oscillation simulation model for a steam turbine unit. The method includes: firstly, generating an initial valve position flow characteristic function based on the design parameters of the steam turbine unit and actual field data; secondly, generating a comprehensive valve position allocation characteristic function based on the initial valve position flow characteristic function and comprehensive valve position commands; and finally, generating a low-frequency oscillation simulation model of the steam turbine unit based on the DEH control model of the steam turbine unit, the field equipment model, and the comprehensive valve position allocation characteristic function. This invention solves the problem of the influence of the flow characteristics of different control valves on the unit's regulation characteristics, particularly addressing the issue that the unit's steady-state performance decreases under linearly decreasing flow characteristics, leading to low-frequency oscillations that cannot be simulated using a model. Therefore, it provides a basis for the reproduction, localization, and resolution of low-frequency oscillation problems. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a diagram illustrating the framework of existing methods for constructing simulation models of steam turbine units.

[0042] Figure 2 This is a diagram illustrating the framework of existing methods for constructing simulation models of control mechanisms.

[0043] Figure 3 This is a flowchart illustrating the method for establishing a low-frequency oscillation simulation model of a steam turbine unit in an embodiment of the present invention. Figure 1 ;

[0044] Figure 4 This is a flowchart illustrating step 300 in an embodiment of the present invention;

[0045] Figure 5 This is a flowchart illustrating step 301 in an embodiment of the present invention;

[0046] Figure 6 This is a flowchart illustrating the method for establishing a low-frequency oscillation simulation model of a steam turbine unit in an embodiment of the present invention. Figure 2 ;

[0047] Figure 7 This is a flowchart illustrating the method for establishing a low-frequency oscillation simulation model of a steam turbine unit in an embodiment of the present invention. Figure 3 ;

[0048] Figure 8 This is a flowchart illustrating the method for establishing a low-frequency oscillation simulation model of a steam turbine unit in a specific embodiment of the present invention;

[0049] Figure 9 This is a comparison chart of the simulation curve of the original simulation model and the actual low-frequency oscillation in a specific embodiment of the present invention;

[0050] Figure 10 This is a block diagram of the simulation model of the control mechanism after adding the valve flow characteristic model in a specific embodiment of the present invention;

[0051] Figure 11 To further illustrate the specific implementation of this invention, a comparison chart of the simulation curve of the flow characteristic simulation model and the actual low-frequency oscillation is added.

[0052] Figure 12 This is a flow characteristic curve of valve CV1-4 in a specific embodiment of the present invention;

[0053] Figure 13 This is a schematic diagram of a device for establishing a low-frequency oscillation simulation model of a steam turbine unit in a specific embodiment of the present invention. Figure 1 ;

[0054] Figure 14 This is a block diagram of the simulation model generation module 30 in an embodiment of the present invention;

[0055] Figure 15 This is a block diagram of the flow data determination unit 301 in an embodiment of the present invention;

[0056] Figure 16 This is a schematic diagram of a device for establishing a low-frequency oscillation simulation model of a steam turbine unit in a specific embodiment of the present invention. Figure 2 ;

[0057] Figure 17 This is a schematic diagram of a device for establishing a low-frequency oscillation simulation model of a steam turbine unit in a specific embodiment of the present invention. Figure 3 ;

[0058] Figure 18 This is a schematic diagram of the structure of an electronic device in an embodiment of the present invention. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0061] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product or device.

[0062] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0063] Existing unit simulation logic, such as Figure 1 As shown, it mainly includes the DEH control section and the field equipment model section. The DEH control section only shows the control block diagram under unit coordination mode (load control mode; other control modes are similar). This part mainly includes two loops: a load control loop and a frequency regulation loop. The load control PID outputs the valve position control command P. C The field servo valves and hydraulic actuators are represented by the control mechanism model (their specific structure is as follows). Figure 2 (As shown). The actual valve opening signal output by the control mechanism model is sent to the turbine power model. The model outputs a power signal P, which is fed back to the DEH control section through the power measurement loop, forming a closed loop.

[0064] See control mechanism model Figure 2 The servo card receives the DEH control command P.C After the servo card's PID calculation outputs control commands, which are then limited by upper and lower amplitudes, the signals are converted into hydraulic motor control signals by the electro-hydraulic conversion simulation module. The hydraulic motor simulation module simulates the valve's movement, which is then converted into a valve position feedback signal by the LVDT simulation model and used as a comparison signal for the servo card, thus forming a closed-loop control.

[0065] Existing thermal power units typically employ 2-4 valves in their turbine regulating valves, with control methods including single-valve and sequential valve control. However, current control mechanism simulation models treat the entire valve group system as a single valve group to simulate all operating conditions. Due to issues such as improper valve flow curve design or long-term degradation of valve throttling linearity, the aforementioned simulation logic fails to reflect these problems. In particular, special operating conditions, such as frequent frequency fluctuations causing activation of the primary frequency regulation circuit and resulting in significant valve fluctuations and system oscillations, cannot be simulated and reproduced.

[0066] To address the aforementioned technical challenges, embodiments of the present invention provide a specific implementation method for establishing a simulation model of low-frequency oscillations in a steam turbine unit. See [link to details]. Figure 3 The method specifically includes the following:

[0067] Step 100: Generate the initial valve position flow characteristic function based on the design parameters of the steam turbine unit and the actual field data;

[0068] Step 200: Generate a comprehensive valve position allocation characteristic function based on the initial valve position flow characteristic function and the comprehensive valve position command;

[0069] Specifically, in steps 100 and 200, a comprehensive valve position command P is added. C (P C Represents the overall valve position command, see Figure 1 In the middle, it is the comprehensive valve position allocation characteristic function from the control output value of the PID in the DEH control logic to each valve of the steam turbine.

[0070] Step 300: Generate a low-frequency oscillation simulation model of the turbine unit based on the DEH control model of the turbine unit, the field equipment model, and the integrated valve position allocation characteristic function.

[0071] The actual command value for each valve is obtained through the allocation function. The actual valve position value is obtained through the simulation of the entire original control mechanism. Then, it is converted into the flow rate value of each individual valve through multiple flow characteristic functions (these functions can be identified through actual experimental data). Finally, the flow rates of all four valves are accumulated through the matching function to represent the total steam flow rate entering the turbine. Finally, a low-frequency oscillation simulation model of the turbine unit is generated based on the DEH control model, the field equipment model, and the total steam flow rate.

[0072] As described above, this invention provides a method for establishing a low-frequency oscillation simulation model for a steam turbine unit, comprising: firstly, generating an initial valve position flow characteristic function based on the design parameters of the steam turbine unit and actual field data; secondly, generating a comprehensive valve position allocation characteristic function based on the initial valve position flow characteristic function and comprehensive valve position commands; and finally, generating a low-frequency oscillation simulation model of the steam turbine unit based on the DEH control model of the steam turbine unit, the field equipment model, and the comprehensive valve position allocation characteristic function. This invention solves the problem of the influence of the flow characteristics of different control valves on the unit's regulation characteristics, particularly addressing the issue that the unit's steady-state performance decreases under linearly decreasing flow characteristics, leading to low-frequency oscillations that cannot be simulated using a model. Therefore, this invention provides a basis for the reproduction, localization, and resolution of low-frequency oscillation problems.

[0073] In one embodiment, see Figure 4 Step 300 includes:

[0074] Step 301: Determine the flow data corresponding to each valve of the turbine unit according to the comprehensive valve position allocation characteristic function;

[0075] Step 302: Generate a low-frequency oscillation simulation model of the turbine unit based on the DEH control model of the turbine unit, the field equipment model, and the flow data.

[0076] In one embodiment, see Figure 5 Step 301 includes:

[0077] Step 3011: Determine the actual command value corresponding to each valve of the turbine unit according to the allocation function corresponding to each valve of the turbine unit;

[0078] Step 3012: Determine the flow data corresponding to each valve of the turbine unit based on the comprehensive valve position allocation characteristic function and the actual command value.

[0079] First, the actual command value of each valve is obtained through the allocation function. Then, the actual valve position value is obtained through the simulation of the entire original control mechanism. Finally, the flow rate value of a single valve is converted into a comprehensive valve position allocation characteristic function.

[0080] In one embodiment, see Figure 6 The methods for establishing simulation models of low-frequency oscillations in steam turbine units also include:

[0081] Step 400: Generate the allocation function for each valve of the turbine unit based on the design parameters of the turbine unit and the actual field data.

[0082] In one embodiment, the integrated valve position allocation characteristic function includes: a single valve position allocation characteristic function and a sequential valve position allocation characteristic function.

[0083] In one embodiment, see Figure 7 The methods for establishing simulation models of low-frequency oscillations in steam turbine units also include:

[0084] Step 500: Reproduce the low-frequency oscillation of the turbine unit according to the turbine unit low-frequency oscillation simulation model.

[0085] In one specific implementation, see Figure 8 The present invention also provides a specific implementation method for establishing a simulation model of low-frequency oscillation of a steam turbine unit, taking a 350MW supercritical unit with 4 valves as an example.

[0086] S1: Generate the initial valve position flow characteristic function based on the design parameters of the steam turbine unit and actual field data;

[0087] S2: Generate a comprehensive valve position allocation characteristic function based on the initial valve position flow characteristic function and the comprehensive valve position command;

[0088] S3: Generate a low-frequency oscillation simulation model of the turbine unit based on the DEH control model of the turbine unit, the field equipment model, and the integrated valve position allocation characteristic function.

[0089] See Figure 9 Under external frequency disturbance conditions, the system simulation using the original control mechanism and original model is shown in the figure below. The simulation model cannot reproduce the phenomenon of low-frequency oscillation.

[0090] See Figure 10 In the above steps, add the integrated valve position command P. C (P C Represents the overall valve position command, see Figure 1 In the middle, the control output value of the PID in the DEH control logic is used to calculate the comprehensive valve position allocation characteristic function for each valve in the turbine. (The actual allocation depends on the unit's operating state; for a 4-valve configuration, it can be in single-valve or sequential valve mode. In this case, the comprehensive valve position allocation characteristic function consists of two independent functions, one for the single-valve function and one for the sequential valve function. See [link to documentation]). Figure 12 , can be Figure 2 The curves in the diagram are used to obtain the single-valve function and the sequential valve function. The allocation function is obtained by identifying the original design parameters and actual field data. After the allocation function, the actual command value of each valve is obtained. The actual valve position value is obtained by simulating the entire original control mechanism. Then, it is converted into the flow rate value of a single valve by four flow characteristic functions (which can be obtained by fitting field data). (This function can be obtained by identifying actual test data). Finally, the flow rates of all four valves are accumulated by the matching function to represent the total steam flow rate entering the turbine.

[0091] The simulation results are shown in the figure below after adding flow distribution, flow characteristics, and matching functions based on the actual turbine valve flow curve (this curve represents preliminary parameters obtained from the turbine manufacturer's design, which are corrected based on actual field data after the unit is in normal operation). Figure 9 , Figure 11 The comparison shows that the simulation results of the model system can effectively reflect the characteristics of oscillation, such as oscillation frequency, amplitude, and oscillation start and end time. Therefore, it can be concluded that the model can accurately reflect the unit's regulation characteristics.

[0092] The characteristic functions of the four control valves are obtained by fitting control logic and field data, and the specific configuration is as follows: Figure 12 As shown in Tables 1 and 2. Figure 12 In the unit's sequential valve mode, the input is a Pc command, which is converted into the actual command on a specific control valve. The horizontal axis represents Pc, and the vertical axis represents the command of a specific valve. For example, the solid line represents the opening command of valves C1 and C2.

[0093] Table 1 Flow distribution under sequence valve

[0094] <![CDATA[P C ]]> 0 12.6 50.9 57.22 60.419 65.063 65.216 67.652 70.85 73.287 C1 / C2 0 15.0 28.27 32.71 37.07 50.05 55.75 82.32 91.58 100 C3 0 0 0 0 0 0 0 0 0 0 C4 0 0 0 0 0 0 0 0 0 14.76

[0095] Table 2

[0096] <![CDATA[P C ]]> 79.987 84.632 87.754 89.505 91.561 93.921 97.424 99.784 100 C1 / C2 100 100 100 100 100 100 100 100 100 C3 0 0 0 0 14.43 20.041 35.59 69.29 100 C4 21.48 28.23 41.81 86.95 94.561 100 100 100 100

[0097] Note: Table 2 is a continuation of the data shown in Table 1.

[0098] As described above, this invention provides a method for establishing a low-frequency oscillation simulation model for a steam turbine unit, comprising: first, generating an initial valve position flow characteristic function based on the design parameters of the steam turbine unit and actual field data; then, generating a comprehensive valve position allocation characteristic function based on the initial valve position flow characteristic function and comprehensive valve position commands; and finally, generating a low-frequency oscillation simulation model for the steam turbine unit based on the DEH control model, field equipment model, and comprehensive valve position allocation characteristic function. This invention, based on the changes in the actual flow characteristics of the valves and fully considering the differences in the configuration of the steam turbine valve group, modifies the control unit simulation model by adding characteristic functions to the flow characteristic curves of each valve, enabling the simulation model to reproduce the low-frequency oscillation phenomenon caused by the valve characteristics and compensating for the deficiencies of the original model.

[0099] Based on the same inventive concept, this application also provides a device for establishing a low-frequency oscillation simulation model of a steam turbine unit, which can be used to implement the method described in the above embodiments, as shown in the following embodiments. Since the principle of the device for establishing a low-frequency oscillation simulation model of a steam turbine unit is similar to that of the method for establishing a low-frequency oscillation simulation model of a steam turbine unit, the implementation of the device can refer to the implementation of the method for establishing a low-frequency oscillation simulation model of a steam turbine unit, and repeated details will not be elaborated further. As used below, the terms "unit" or "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0100] The embodiments of the present invention provide a specific implementation of a device for establishing a low-frequency oscillation simulation model of a steam turbine unit, which can realize a method for establishing a low-frequency oscillation simulation model of a steam turbine unit. See [link to specific implementation details]. Figure 13 The device for establishing a low-frequency oscillation simulation model for steam turbine units specifically includes the following components:

[0101] The initial function generation module 10 is used to generate an initial valve position flow characteristic function based on the design parameters of the steam turbine unit and actual field data.

[0102] The comprehensive function generation module 20 is used to generate a comprehensive valve position allocation characteristic function based on the initial valve position flow characteristic function and the comprehensive valve position command;

[0103] The simulation model generation module 30 is used to generate a low-frequency oscillation simulation model of the turbine unit based on the DEH control model of the turbine unit, the field equipment model, and the integrated valve position allocation characteristic function.

[0104] In one embodiment, see Figure 14 The simulation model generation module 30 includes:

[0105] The flow data determination unit 301 is used to determine the flow data corresponding to each valve of the turbine unit according to the comprehensive valve position allocation characteristic function.

[0106] The simulation model generation unit 302 is used to generate a low-frequency oscillation simulation model of the turbine unit based on the DEH control model of the turbine unit, the field equipment model, and the flow data.

[0107] In one embodiment, see Figure 15 The traffic data determination unit 301 includes:

[0108] The instruction value determination unit 3011 is used to determine the actual instruction value corresponding to each valve of the turbine unit according to the allocation function corresponding to each valve of the turbine unit;

[0109] The flow data determination subunit 3012 is used to determine the flow data corresponding to each valve of the turbine unit based on the comprehensive valve position allocation characteristic function and the actual command value.

[0110] In one embodiment, see Figure 16 The device for establishing a low-frequency oscillation simulation model for steam turbine units also includes:

[0111] The allocation function generation module 40 is used to generate the allocation function corresponding to each valve of the turbine unit based on the design parameters of the turbine unit and the actual field data.

[0112] In one embodiment, the integrated valve position allocation characteristic function includes: a single valve position allocation characteristic function and a sequential valve position allocation characteristic function.

[0113] In one embodiment, see Figure 17 The device for establishing a low-frequency oscillation simulation model for steam turbine units also includes:

[0114] The low-frequency oscillation reproduction module 50 is used to reproduce the low-frequency oscillation of the turbine unit according to the low-frequency oscillation simulation model of the turbine unit.

[0115] As described above, this invention provides a device for establishing a low-frequency oscillation simulation model for a steam turbine unit, comprising: first, generating an initial valve position flow characteristic function based on the design parameters of the steam turbine unit and actual field data; then, generating a comprehensive valve position allocation characteristic function based on the initial valve position flow characteristic function and comprehensive valve position commands; and finally, generating a low-frequency oscillation simulation model for the steam turbine unit based on the DEH control model of the steam turbine unit, the field equipment model, and the comprehensive valve position allocation characteristic function. This invention, based on the changes in the actual flow characteristics of the valves and fully considering the differences in the configuration of the steam turbine valve group, modifies the control unit simulation model by adding characteristic functions to the flow characteristic curves of each valve, enabling the simulation model to reproduce the low-frequency oscillation phenomenon caused by the valve characteristics and compensating for the deficiencies of the original model.

[0116] The embodiments of this application also provide a specific implementation of an electronic device capable of implementing all steps in the method for establishing a low-frequency oscillation simulation model of a steam turbine unit in the above embodiments. See [link to implementation details]. Figure 18 The electronic devices specifically include the following:

[0117] Processor 1201, memory 1202, communications interface 1203, and bus 1204;

[0118] The processor 1201, memory 1202, and communication interface 1203 communicate with each other via bus 1204; the communication interface 1203 is used to realize information transmission between server-side devices and client-side devices and other related devices.

[0119] The processor 1201 is used to call the computer program in the memory 1202. When the processor executes the computer program, it implements all the steps in the method for establishing a low-frequency oscillation simulation model of a steam turbine unit in the above embodiment. For example, when the processor executes the computer program, it implements the following steps:

[0120] Step 100: Generate the initial valve position flow characteristic function based on the design parameters of the steam turbine unit and the actual field data;

[0121] Step 200: Generate a comprehensive valve position allocation characteristic function based on the initial valve position flow characteristic function and the comprehensive valve position command;

[0122] Step 300: Generate a low-frequency oscillation simulation model of the turbine unit based on the DEH control model of the turbine unit, the field equipment model, and the integrated valve position allocation characteristic function.

[0123] Embodiments of this application also provide a computer-readable storage medium capable of implementing all steps in the method for establishing a low-frequency oscillation simulation model of a steam turbine unit as described in the above embodiments. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements all steps in the method for establishing a low-frequency oscillation simulation model of a steam turbine unit as described in the above embodiments. For example, when the processor executes the computer program, it implements the following steps:

[0124] Step 100: Generate the initial valve position flow characteristic function based on the design parameters of the steam turbine unit and the actual field data;

[0125] Step 200: Generate a comprehensive valve position allocation characteristic function based on the initial valve position flow characteristic function and the comprehensive valve position command;

[0126] Step 300: Generate a low-frequency oscillation simulation model of the turbine unit based on the DEH control model of the turbine unit, the field equipment model, and the integrated valve position allocation characteristic function.

[0127] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, hardware + program embodiments are relatively simple in description because they are fundamentally similar to method embodiments; relevant parts can be referred to the descriptions in the method embodiments.

[0128] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

[0129] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0130] While this application provides method operation steps as shown in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-inventive labor. The order of steps listed in the embodiments is merely one possible execution order among many and does not represent the only execution order. In actual device or client product execution, the method can be executed sequentially as shown in the embodiments or drawings, or in parallel (e.g., in a parallel processor or multi-threaded processing environment).

[0131] For ease of description, the above devices are described in terms of function, divided into various modules. Of course, in implementing the embodiments of this specification, the functions of each module can be implemented in one or more software and / or hardware components, or a module that performs the same function can be implemented by a combination of multiple sub-modules or sub-units. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms.

[0132] Those skilled in the art will also know that, besides implementing the controller using purely computer-readable program code, the same functions can be achieved by logically programming the method steps, making the controller function as logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers (PLCs), and embedded microcontrollers. Therefore, such a controller can be considered a hardware component, and the devices within it used to implement various functions can also be considered structures within that hardware component. Alternatively, the devices used to implement various functions can be considered as both software modules implementing the method and structures within a hardware component.

[0133] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0134] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0135] The embodiments described in this specification can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. The embodiments of this specification can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0136] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, system embodiments are basically similar to method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments in this specification. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0137] The above description is merely an embodiment of the present specification and is not intended to limit the embodiments of the present specification. For those skilled in the art, various modifications and variations can be made to the embodiments of the present specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the embodiments of the present specification should be included within the scope of the claims of the embodiments of the present specification.

Claims

1. A method for establishing a simulation model of low-frequency oscillations in a steam turbine unit, characterized in that, include: The initial valve position flow characteristic function is generated based on the design parameters of the steam turbine unit and actual field data. A comprehensive valve position allocation characteristic function is generated based on the initial valve position flow characteristic function and the comprehensive valve position command. A low-frequency oscillation simulation model of the turbine unit is generated based on the DEH control model of the turbine unit, the field equipment model, and the integrated valve position allocation characteristic function. The process of generating a low-frequency oscillation simulation model of the turbine unit based on the DEH control model of the turbine unit, the field equipment model, and the integrated valve position allocation characteristic function includes: The flow data corresponding to each valve of the turbine unit is determined based on the comprehensive valve position allocation characteristic function. A low-frequency oscillation simulation model of the turbine unit is generated based on the DEH control model of the turbine unit, the field equipment model, and the flow data. The step of determining the flow data corresponding to each valve of the turbine unit based on the comprehensive valve position allocation characteristic function includes: The actual command value corresponding to each valve of the turbine unit is determined according to the allocation function corresponding to each valve of the turbine unit; The flow data corresponding to each valve of the turbine unit is determined based on the comprehensive valve position allocation characteristic function and the actual command value, specifically: First, the actual command value of each valve is obtained through the allocation function. Then, the actual valve position value is obtained through the simulation of the entire original control mechanism. Finally, the flow rate value of a single valve is converted into a comprehensive valve position allocation characteristic function.

2. The method for establishing a low-frequency oscillation simulation model for a steam turbine unit as described in claim 1, characterized in that, Also includes: The allocation function for each valve of the turbine unit is generated based on the design parameters of the turbine unit and the actual field data.

3. The method for establishing a low-frequency oscillation simulation model for a steam turbine unit as described in claim 1, characterized in that, The comprehensive valve position allocation characteristic function includes: single valve position allocation characteristic function and sequential valve position allocation characteristic function.

4. The method for establishing a low-frequency oscillation simulation model for a steam turbine unit as described in claim 1, characterized in that, Also includes: The low-frequency oscillation of the turbine unit was reproduced using the simulation model of the turbine unit's low-frequency oscillation.

5. A device for establishing a low-frequency oscillation simulation model of a steam turbine unit, characterized in that, include: The initial function generation module is used to generate the initial valve position flow characteristic function based on the design parameters of the steam turbine unit and actual field data. The integrated function generation module is used to generate an integrated valve position allocation characteristic function based on the initial valve position flow characteristic function and the integrated valve position command. The simulation model generation module is used to generate a low-frequency oscillation simulation model of the turbine unit based on the DEH control model of the turbine unit, the field equipment model, and the integrated valve position allocation characteristic function. The simulation model generation module includes: The flow data determination unit is used to determine the flow data corresponding to each valve of the turbine unit according to the comprehensive valve position allocation characteristic function. The simulation model generation unit is used to generate a low-frequency oscillation simulation model of the turbine unit based on the DEH control model of the turbine unit, the field equipment model, and the flow data. The traffic data determination unit includes: The instruction value determination unit is used to determine the actual instruction value corresponding to each valve of the turbine unit according to the allocation function corresponding to each valve of the turbine unit; The flow data determination subunit is used to determine the flow data corresponding to each valve of the turbine unit based on the comprehensive valve position allocation characteristic function and the actual command value. Specifically: First, the actual command value of each valve is obtained through the allocation function. Then, the actual valve position value is obtained through the simulation of the entire original control mechanism. Finally, the flow rate value of a single valve is converted into a comprehensive valve position allocation characteristic function.

6. The device for establishing a low-frequency oscillation simulation model of a steam turbine unit as described in claim 5, characterized in that, Also includes: The allocation function generation module is used to generate the allocation function corresponding to each valve of the turbine unit based on the design parameters of the turbine unit and the actual field data.

7. The device for establishing a low-frequency oscillation simulation model of a steam turbine unit as described in claim 5, characterized in that, The comprehensive valve position allocation characteristic function includes: single valve position allocation characteristic function and sequential valve position allocation characteristic function.

8. The device for establishing a low-frequency oscillation simulation model of a steam turbine unit as described in claim 5, characterized in that, Also includes: The low-frequency oscillation reproduction module is used to reproduce the low-frequency oscillation of the turbine unit based on the turbine unit low-frequency oscillation simulation model.

9. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instruction is executed by the processor, it implements the steps of the method for establishing a low-frequency oscillation simulation model of a steam turbine unit as described in any one of claims 1 to 4.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method for establishing a low-frequency oscillation simulation model of a steam turbine unit as described in any one of claims 1 to 4.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the method for establishing a low-frequency oscillation simulation model of a steam turbine unit as described in any one of claims 1 to 4.

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